JP7406927B2 - electric work equipment - Google Patents

Description

The present disclosure relates to an electric working machine.

Patent Document 1 listed below discloses a power tool equipped with an AD converter and a self-diagnosis function for self-diagnosing whether or not the AD converter operates normally. By providing a self-diagnosis function, it is possible to improve the reliability of power tools.

Japanese Patent Application Publication No. 2010-58244

The higher the reliability of the power tool, the better. In particular, as power tools become more sophisticated and their internal configurations become more complex, a higher level of reliability may be required of the power tools.
One aspect of the present disclosure aims to improve the reliability of an electric working machine.

An electric working machine in one aspect of the present disclosure includes a motor, an information output circuit, a control circuit, and a drive stop circuit.
The information output circuit outputs status information indicating the status of the electric working machine. The control circuit executes motor control processing through software processing based on a specific program. The motor control process includes a process of permitting driving of the motor in response to status information output from the information output circuit indicating that the motor can be driven. The drive stop circuit operates by hardware processing without using software processing. The drive stop circuit stops the motor regardless of the execution state of the motor control process in response to the status information output from the information output circuit indicating that the motor should be stopped.

In the electric working machine configured in this way, the same status information is monitored by both software processing and hardware processing. If the motor is stopped by hardware processing, the motor will not be driven even if driving of the motor is permitted by software processing. Therefore, it becomes possible to improve the reliability of the electric working machine.

The status information may include a physical quantity indicating the status of the electric working machine. The information output circuit may include a detection circuit configured to detect a physical quantity and output detection information indicating the detected physical quantity. The motor control process may include a process of outputting a drive command for driving the motor in response to the physical quantity indicated by the detection information output from the detection circuit being included in the first tolerance range. . The drive stop circuit is configured to stop the motor even if a drive command is output from the control circuit in response to the fact that the physical quantity indicated by the detection information output from the detection circuit is not included in the second tolerance range. The first stop circuit may include a first stop circuit.

Note that "the physical quantity indicated by the detection information is included in the first tolerance range" is one (form) of "the state information indicates that the motor can be driven". Good too. Furthermore, "the physical quantity indicated by the detection information is not included in the second tolerance range" is one (form) of "the state information indicates that the motor should be stopped". There may be. Furthermore, the fact that the first stop circuit "stops the motor even if a drive command is output from the control circuit" means that the drive stop circuit "stops the motor regardless of the execution state of motor control processing". (one form).

In the electric working machine configured in this way, the same physical quantity is monitored by both software processing and hardware processing. Then, if both the software processing and the hardware processing determine that the physical quantity is within an appropriate range, the motor is driven based on the drive command. Therefore, it becomes possible to improve the reliability of the electric working machine.

The electric working machine may further include a drive circuit. The drive circuit may be configured to receive a drive command from the control circuit, and may be configured to supply power to the motor to drive the motor in response to the input of the drive command. The first stop circuit may be configured to stop the motor by cutting off input of a drive command to the drive circuit.

In the electric working machine configured in this way, the first stop circuit easily stops the motor when the physical quantity indicated by the detection information output from the detection circuit is not included in the second tolerance range. Can be done.

The first stop circuit may be configured to output a stop signal in response to the fact that the physical quantity indicated by the detection information output from the detection circuit is not included in the second tolerance range. The control circuit may be configured to receive a stop signal, and may be configured not to output a drive command when the stop signal is input.

In the electric working machine configured in this way, even if the control circuit determines that the physical quantity indicated by the detection information output from the detection circuit is included in the first tolerance range, the first stop circuit stops the machine. If a signal is input, no drive command is output. Therefore, it is possible to further improve the reliability of the electric working machine.

The control circuit may be configured to output a pseudo abnormality occurrence signal. The detection circuit may be configured to output detection information corresponding to a physical quantity that is not included in the second tolerance range, regardless of the actual physical quantity, in response to input of the pseudo abnormality occurrence signal. . The control circuit may perform output processing and storage processing. The output process may include a process of outputting a pseudo abnormality occurrence signal at a specific diagnostic timing. The storage process may include a process of storing the abnormal state in response to the fact that the stop signal is not input while the pseudo abnormality occurrence signal is being output by the output process. The control circuit may be configured not to output the drive command when an abnormal state is stored.

In the electric working machine configured in this manner, it can be confirmed whether the first stop circuit operates properly by outputting the pseudo abnormality occurrence signal. Therefore, it is possible to further improve the reliability of the electric working machine.

The second tolerance range includes the first tolerance range and may be wider than the first tolerance range. In an electric working machine configured in this way, when a physical quantity is no longer included in the first tolerance range, hardware processing (that is, the first stop circuit) causes the physical quantity to be included in the second tolerance range. The drive command can be stopped by software processing (i.e., by the control circuit) before it is recognized that the drive command is not present.

The electric working machine may further include an operation unit configured to be turned on or off by a user of the electric working machine. In the motor control process, the control circuit may output a drive command when an on operation is performed on the operation section, and may stop outputting the drive command when an off operation is performed on the operation section. The first stop circuit is configured such that when the motor is stopped after the ON operation is performed on the operation unit, the physical quantity indicated by the detection information output from the detection circuit is within a second tolerance range after the motor is stopped. Even if the motor is included in the motor, the motor may be configured to be stopped at least until an off operation is performed on the operating section.

In an electric working machine configured in this way, if the motor is stopped because the physical quantity is no longer included in the second tolerance range, even if the physical quantity is subsequently included in the second tolerance range again. However, in order to drive the motor, the user needs to turn off the operating section once. Therefore, it is possible to prevent the motor from being suddenly driven once it has stopped, and to provide an electric working machine that is easy to use for the user.

The electric working machine may further include a battery that outputs electric power for driving the motor. The status information may include battery information indicating the status of the battery. The information output circuit may include a battery information output circuit configured to output battery information. The drive stop circuit includes a second stop circuit configured to cut off power supply from the battery to the motor in response to the battery information output from the battery information output circuit indicating a battery abnormality. May contain.

Note that "the battery information indicates that the battery is abnormal" may be one (one form) of "the status information indicates that the motor should be stopped." Furthermore, the fact that the second stop circuit "cuts off the supply of power from the battery to the motor" is one of the reasons why the drive stop circuit "stops the motor regardless of the execution state of the motor control process". form).

In the electric working machine configured in this way, the same battery information is monitored by both software processing and hardware processing. If the supply of power from the battery to the motor is cut off by hardware processing, the motor will not be driven even if driving of the motor is permitted by software processing. Therefore, it becomes possible to improve the reliability of the electric working machine.

The electric working machine may further include a first battery pack, a second battery pack, a mounting portion, and series connection wiring. The first battery pack may be configured to output first power for driving the motor. The second battery pack may be configured to output second power for driving the motor. The mounting portion may be configured to allow the first battery pack and the second battery pack to be attached and detached. The series connection wiring may be configured to connect in series the first battery in the first battery pack attached to the attachment part and the second battery in the second battery pack attached to the attachment part. .

The status information may include first battery information indicating the status of the first battery and second battery information indicating the status of the second battery. The information output circuit may include a first output circuit and a second output circuit. The first output circuit may be provided in the first battery pack and configured to output first battery information. The second output circuit may be provided in the second battery pack and configured to output second battery information.

The drive stop circuit may include a second stop circuit. The second stop circuit determines that the first battery information output from the first output circuit indicates that the first battery is abnormal and/or that the second battery information output from the second output circuit indicates that the second battery is abnormal. The motor may be configured to cut off the supply of the first power and the second power from the first battery and the second battery to the motor in response to an abnormality being indicated.

In an electric working machine configured in this way, if the supply of the first power and the second power to the motor is cut off by hardware processing, the motor will not be driven even if the motor is permitted to be driven by software processing. Not done. Therefore, it becomes possible to improve the reliability of the electric working machine.

FIG. 1 is a perspective view of an electric working machine according to an embodiment. FIG. 1 is an explanatory diagram showing an electrical configuration of an electric working machine according to an embodiment. 3 is an explanatory diagram showing in detail a part of the electric working machine shown in FIG. 2. FIG. FIG. 4A is an explanatory diagram showing the state of the trigger switch section when the trigger operation section is not pulled, and FIG. 4B is an explanatory diagram showing the state of the trigger switch section when the trigger operation section is pulled by a constant operation amount, which is at least the maximum operation amount. FIG. 4C is an explanatory diagram showing the state of the switch section, and FIG. 4C is an explanatory diagram showing the state of the trigger switch section when the trigger operation section is pulled down by the maximum amount of operation. 5 is a time chart showing a first example of execution of self-diagnosis. It is a time chart which shows the 2nd execution example of self-diagnosis. It is a time chart which shows the 3rd execution example of self-diagnosis. 3 is a flowchart showing main processing. 9 is a flowchart showing details of battery status processing in S130 in FIG. 8. 9 is a flowchart showing details of the motor control process in S160 in FIG. 8. 9 is a flowchart showing details of the self-diagnosis process in S180 in FIG. 8. 12 is a flowchart showing details of the self-diagnosis history reading process in S410 in FIG. 11. 12 is a flowchart showing details of the self-diagnosis implementation process of S420 in FIG. 11. 12 is a flowchart showing details of the self-diagnosis history writing process in S430 in FIG. 11. 7 is a flowchart showing trigger detection function diagnosis processing. 3 is a flowchart illustrating trigger-off detection check processing. 3 is a flowchart showing trigger-on detection check processing. FIG. 3 is an explanatory diagram showing another example of the electrical configuration of the electric working machine. FIG. 3 is an explanatory diagram showing another example of the electrical configuration of the electric working machine.

Embodiments of the present disclosure will be described below with reference to the drawings.
(1) Appearance of electric working machine The electric working machine 1 shown in FIG. 1 is configured as, for example, a rechargeable brush cutter. A rechargeable brush cutter is used, for example, to cut down grass and small-diameter trees. As shown in FIG. 1, the electric working machine 1 includes a support rod 150, a handle 151, a cutter unit 160, and a controller unit 165.

The support rod 150 has an elongated cylindrical shape. The cutter unit 160 is provided at the first end of the support rod 150. A controller unit 165 is provided at the second end of the support rod 150.

Cutter unit 160 includes a housing 161. Housing 161 is secured to the first end of support rod 150. A motor 21 (see FIG. 2), which will be described later, is housed inside the housing 161.

The housing 161 is configured to allow a rotary blade 162 to be attached and detached. FIG. 1 shows a state in which a rotary blade 162 is attached to a housing 161. The housing 161 is provided with a drive mechanism (not shown) that transmits the rotation of the motor 21 to the rotary blade 162. Thereby, when the motor 21 rotates, the rotary blade 162 rotates due to its rotational driving force.

Controller unit 165 includes a housing 166. The housing 166 accommodates various circuits including a control circuit 23 (see FIG. 2), which will be described later. The housing 166 is configured to allow the first battery pack 5 and the second battery pack 7 to be attached and detached.

The handle 151 is provided approximately in the middle of the support rod 150 in the longitudinal direction. The handle 151 is formed by, for example, a pipe curved into a U-shape. A first grip 152 is provided at a first end of the handle 151, and a second grip 153 is provided at a second end of the handle 151. The first grip 152 is held, for example, by the right hand of the user of the electric working machine 1, and the second grip 153 is held, for example, by the left hand of the user of the electric working machine 1.

The first grip 152 is provided with a trigger operation section 20 . The trigger operation section 20 is pulled and operated by the user. The pull operation is an operation of pulling the trigger operation section 20 toward the first grip 152 using a user's finger or the like, or in other words, an operation of pushing the trigger operation section 20 into the first grip 152.

The trigger operation section 20 is biased by an unillustrated elastic member in an operation release direction opposite to the pull operation direction. Therefore, in a non-operated state where the trigger operation section 20 is not pulled by the user, most of it protrudes from the first grip 152 due to the biasing force of the elastic member, as shown in FIG. On the other hand, when the trigger operating section 20 is pulled by the user, the trigger operating section 20 moves in the pulling operation direction (i.e., toward the first grip 152 side) against the urging force, and in response to the movement, the trigger operating section 20 moves to the first grip 152 side. It goes into the grip 152.

The first grip 152 is further provided with an operation display section 170. The operation display section 170 includes a main power switch 30 and a display panel 171.
The main power switch 30 is operated by the user to turn on or off the main power of the electric working machine 1 . A control circuit 23, which will be described later, turns on or off the main power source of the electric working machine 1 in response to the operation of the main power switch 30.

The main power switch 30 of this embodiment may be, for example, a so-called momentary switch that is turned on only while being pressed by the user and returns to the off state when the user releases the pressing operation. In this case, the control circuit 23 may alternately switch the main power supply on or off each time the main power switch 30 is pushed back. The push-back operation refers to an operation in which the main power switch 30 is turned on and then returned to the off state.

Note that the main power switch 30 may be any type of switch. The main power switch 30 may be, for example, a so-called alternate switch that alternately switches between an on state and an off state each time it is pressed by the user. In this case, the control circuit 23 sets the main power to ON when the main power switch 30 is in the ON state, and sets the main power to OFF when the main power switch 30 is in the OFF state. Good too. Further, the main power switch 30 may be a sliding type switch, for example.

Various information is displayed on the display panel 171, such as information indicating whether the main power source is set to be on or not, information indicating various states of the electric working machine 1, and the like. The display panel 171 may include any display device. The display panel 171 may include, for example, a liquid crystal display, an LED, or the like.

(2) Electrical configuration of electric working machine The electrical configuration of electric working machine 1 of this embodiment will be explained with reference to FIGS. 2 and 3. Note that FIG. 3 shows a part of FIG. 2 (the right side of the control circuit 23 described later) in more detail. As shown in FIG. 2, the electric working machine 1 includes a main body 3, a first battery pack 5, and a second battery pack 7. In addition, in FIG. 2, for convenience of explanation, the motor 21 in the housing 161, various circuits in the housing 166, the trigger operation part 20 and the operation display part 170 provided in the first grip 152, etc., of the electric working machine 1 are shown. An assembly of various electric components, various circuits, etc. provided in each part is referred to as a main body part 3.

The first battery pack 5 includes a battery 11 and a battery abnormality detection circuit 12. The battery 11 is, for example, a secondary battery that can be charged and discharged. However, the battery 11 may be a primary battery.

The battery abnormality detection circuit 12 monitors the first battery pack 5. The battery abnormality detection circuit 12 outputs a first discharge permission signal SA1 when no abnormality is detected during a specific discharge instruction period. The battery abnormality detection circuit 12 may monitor the state of the battery 11, for example. More specifically, the battery abnormality detection circuit 12 determines whether the battery 11 is abnormal based on at least one of the voltage value of the battery 11, the value of the current discharged from the battery 11, and the temperature of the battery 11. It may be determined whether or not. When the battery abnormality detection circuit 12 determines that the battery 11 is normal, it outputs a first discharge permission signal SA1 to indicate that the battery 11 is normal, and determines that the battery 11 is abnormal. In this case, it may be indicated that the battery 11 is abnormal by not outputting the first discharge permission signal SA1.

Trigger detection information ST0, which will be described later, is input to the first battery pack 5 from the main body 3. The specific discharge instruction period may be, for example, a period in which the logic level of the trigger detection information ST0 is at H level, that is, a period in which the trigger operation section 20 described later is turned on.

The second battery pack 7 includes a battery 16 and a battery abnormality detection circuit 17. The second battery pack 7 is configured similarly to the first battery pack 5. The battery abnormality detection circuit 17 outputs the second discharge permission signal SA2 when no abnormality is detected in the second battery pack 7 during the specific discharge instruction period. The battery abnormality detection circuit 17 may monitor the state of the battery 16, for example. More specifically, the battery abnormality detection circuit 17 determines whether the battery 16 is abnormal based on at least one of the voltage value of the battery 16, the value of the current discharged from the battery 16, and the temperature of the battery 16. It may be determined whether or not. When the battery abnormality detection circuit 17 determines that the battery 16 is normal, it outputs a second discharge permission signal SA2 to indicate that the battery 16 is normal, and determines that the battery 16 is abnormal. In this case, it may be indicated that the battery 16 is abnormal by not outputting the second discharge permission signal SA2.

As shown in FIGS. 2 and 3, the main body 3 includes a trigger operation section 20, a motor 21, a motor drive circuit 22, a control circuit 23, a main power switch 30, a trigger switch section 26, and a trigger detection section 20. It includes a circuit 80, an overvoltage detection circuit 50, a first off detection circuit 39, a second off detection circuit 49, a current detection circuit 55, an overheat detection section 60, a cutoff latch circuit 70, and a display panel 171. .

Note that the main body portion 3 is provided with a power supply circuit (not shown). The power supply circuit generates and outputs a power supply voltage having a constant voltage value from the battery voltage input from the first battery pack 5 or the second battery pack 7 mounted on the electric working machine 1. The power supply voltage is supplied to each part of the main body 3 via a control power line (not shown). Each part is operated by power supply voltage supplied from the power supply circuit.

For example, the power supply circuit may be configured to output the power supply voltage when the battery voltage is input, regardless of whether the main power supply is set to on or off. Alternatively, the power supply circuit is configured to output the power supply voltage after the main power switch 30 is operated to turn on the main power and until the main power is turned off. Good too.

The trigger switch unit 26 includes a first trigger switch 27 and a second trigger switch 28. The first trigger switch 27 and the second trigger switch 28 are turned on or off in conjunction with the trigger operation section 20 being operated by the user.

The first trigger switch 27 is, for example, a normally open type switch. The second trigger switch 28 is, for example, a normally closed switch. When the trigger operation unit 20 is turned off, the first trigger switch 27 is turned off and the second trigger switch 28 is turned on. When the trigger operation unit 20 is turned on, the first trigger switch 27 is turned on and the second trigger switch 28 is turned off.

The main body 3 further includes a resistor R1, a resistor R2, and a NOT circuit 85. A first end of the first trigger switch 27 is connected to a ground line, and a second end of the first trigger switch 27 is connected to an input terminal of the NOT circuit 85. The second end of the first trigger switch 27 is further connected to the control power line via a resistor R1.

A first end of the second trigger switch 28 is connected to the ground line, and a second end of the second trigger switch 28 is connected to the control circuit 23 via a trigger detection circuit 80. The second end of the second trigger switch 28 is further connected to the control power line via a resistor R2.

The voltage at the second end of the first trigger switch 27 is input to the NOT circuit 85 as a binary signal. Note that the binary signal is a signal indicating either a high level (hereinafter abbreviated as "H level") or a low level (hereinafter abbreviated as "L level"). The NOT circuit 85 inverts the logic level of the input signal and outputs it.

Here, a more specific configuration of the trigger switch section 26 will be described with reference to FIGS. 4A to 4C. As shown in FIGS. 4A to 4C, the trigger switch section 26 includes a switch box 100, a plunger 101, a first trigger switch 27, and a second trigger switch 28. The plunger 101 is connected to and interlocks with the trigger operation section 20 .

The first trigger switch 27 includes a first contact 121 , a second contact 122 , and a support spring 123 . The first contact 121 is connected to, for example, a ground line. The second contact 122 is connected to the NOT circuit 85, for example. The second contact 122 is configured to be rotatable around a rotation axis (not shown). The support spring 123 urges the second contact 122 in the direction of contacting the first contact 121 .

The second trigger switch 28 includes a first electrode 111, a second electrode 112, a substrate 113, and a brush 114. Brush 114 is a conductor. The first electrode 111 and the second electrode 112 are provided on the substrate 113. The brush 114 is provided on the plunger 101 and is moved together with the plunger 101. The first electrode 111 is connected to, for example, a ground line. The second electrode 112 is connected to the trigger detection circuit 80, for example.

The plunger 101 moves in the left direction in FIGS. 4A to 4C, that is, in the aforementioned pulling operation direction, in response to the trigger operation section 20 being pulled by the user. When the trigger operation section 20 is turned off (including a state in which the user is not touching the trigger operation section 20), the plunger 101 is supported at the position shown in FIG. 4A by the biasing force of a spring (not shown). . In this case, in the first trigger switch 27 , the second contact 122 is rotated by the plunger 101 in a direction away from the first contact 121 against the urging force of the support spring 123 . Therefore, the first trigger switch 27 is turned off.

On the other hand, in the second trigger switch 28, the first electrode 111 and the second electrode 112 are electrically connected via the brush 114. Therefore, the second trigger switch 28 is turned on.
When the user pulls the trigger operation unit 20, the plunger 101 moves into the switch box 100. Along with this, the brush 114 of the second trigger switch 28 moves into the switch box 100. In the first trigger switch 27, the plunger 101 gradually moves away from the second contact 122, and as a result, the second contact 122 approaches the first contact 121 due to the urging force of the support spring 123.

As the plunger 101 continues to move in the pulling operation direction, for example, as shown in FIG. 4B, the second contact 122 comes into contact with the first contact 121, and the first trigger switch 27 is turned on. As the plunger 101 moves further in the pulling operation direction, the brush 114 separates from the first electrode 111 and the second trigger switch 28 is turned off, as shown in FIG. 4C. The above-mentioned on operation means that the trigger operation unit 20 is pulled so that the first trigger switch 27 is turned on and the second trigger switch 28 is turned off, as illustrated in FIG. 4C. do. When the user releases the pull operation on the trigger operation section 20, the plunger 101 moves together with the trigger operation section 20 in the operation release direction opposite to the pull operation direction due to the urging force of the above-mentioned elastic member, and as shown in FIG. 4A. Return to the indicated position.

The trigger detection circuit 80 has a trigger detection function. The trigger detection function is a function that outputs information according to the state of the trigger switch section 26. Specifically, the trigger detection circuit 80 outputs first trigger information ST1, second trigger information ST2, and trigger determination information STR.

The output signal of the NOT circuit 85 is input to the trigger detection circuit 80 . The voltage at the second end of the second trigger switch 28 and the first pseudo signal SF1 output from the control circuit 23 are further input to the trigger detection circuit 80.

The voltage at the second end of the second trigger switch 28, which is input to the trigger detection circuit 80, is output to the control circuit 23 as second trigger information ST2. The first pseudo signal SF1 is output from the control circuit 23 when the control circuit 23 executes a trigger detection function diagnosis to be described later.

The first trigger information ST1, the second trigger information ST2, the trigger determination information STR, the signal input from the NOT circuit 85, and the first pseudo signal SF1 are all, for example, binary signals in this embodiment.

The first trigger information ST1 basically indicates information on whether the first trigger switch 27 is on or off. The second trigger information ST2 indicates information on whether the second trigger switch 28 is on or off. The second trigger information ST2 whose logic level is L level indicates that the second trigger switch 28 is turned on, in other words, that the trigger operation section 20 is turned off. The second trigger information ST2 whose logic level is H level indicates that the second trigger switch is turned off, in other words, that the trigger operation unit 20 is turned on.

The trigger detection circuit 80 includes an OR circuit 81 and an AND circuit 82. The output signal of the NOT circuit 85 and the first pseudo signal SF1 are input to the OR circuit 81.
Note that the first pseudo signal SF1 is specifically a signal whose logic level is H level. That is, outputting the first pseudo signal SF1 means that the logic level of the first pseudo signal SF1 becomes H level. Conversely, a state in which the logic level of the first pseudo signal SF1 is L level means a state in which the first pseudo signal SF1 is not output. Such a correspondence relationship between the logic level of a signal and the output state of the signal indicated by the logic level is the same as the above-mentioned first discharge permission signal SA1, second discharge permission signal SA2, and third discharge permission signal SA3 described later. , fourth discharge permission signal SA4, first off detection signal SB1, second off detection signal SB2, overvoltage signal So1, overcurrent signal So2, first overheating signal So31, second overheating signal So32, third overheating signal So33, The same applies to the second pseudo signal SF2, the third pseudo signal SF31, the fourth pseudo signal SF32, and the fifth pseudo signal SF33.

The OR circuit 81 calculates the logical sum of the two input signals and outputs first trigger information ST1 indicating the result of the calculation. The first trigger information ST1 is input to the control circuit 23 and the AND circuit 82.

For example, assume that the first pseudo signal SF1 is not input to the OR circuit 81. In this case, the logic level of the first trigger information ST1 becomes L level when the trigger operation section 20 is operated off, and becomes H level when the trigger operation section 20 is operated on. That is, in both the first trigger information ST1 and the second trigger information ST2, when the logic level is L level, it indicates a trigger off state in which the trigger operation section 20 is operated off, and when the logic level is H level, the trigger operation unit 20 is operated. A trigger-on state is shown in which the section 20 is turned on.

On the other hand, when the first pseudo signal SF1 is input to the OR circuit 81, the logic level of the first trigger information ST1 is It becomes H level. That is, by inputting the first pseudo signal SF1 to the OR circuit 81, the first trigger information ST1 can be brought into a state equivalent to when the trigger operation section 20 is turned on.

The AND circuit 82 receives the first trigger information ST1 and the second trigger information ST2. The AND circuit 82 calculates the logical product of the first trigger information ST1 and the second trigger information ST2, and outputs trigger determination information STR indicating the result of the calculation. The trigger determination information STR is input to the cutoff latch circuit 70. Trigger determination information STR whose logic level is L level indicates a trigger off state, and trigger determination information STR whose logic level is H level indicates a trigger on state.

The motor 21 is rotationally driven by inputting motor drive power from a motor drive circuit 22 . When the motor 21 rotates, its rotational driving force is transmitted to an output tool (not shown) via a driving force transmission mechanism (not shown), and the output tool is operated. The motor 21 of this embodiment is, for example, a brushless motor.

The output tool may be detachable from the electric working machine 1. Any output tool may be used. The output tool may be, for example, a drill bit, a driver bit, a rotary grindstone, a circular saw blade, etc., which can machine a workpiece by rotating. Alternatively, the electric working machine 1 may be configured such that the rotation of the motor 21 is converted into linear motion and output.

The electric working machine 1 further includes a first power supply line 91, a second power supply line 92, and a main power supply line 93. A first end of the first power supply line 91 is connected to the first battery pack 5, and the voltage of the battery 11 is input thereto. A second end of the first power supply line 91 is connected to a first end of the main power supply line 93.

A first end of the second power supply line 92 is connected to the second battery pack 7, and the voltage of the battery 16 is input thereto. A second end of the second power supply line 92 is connected to a first end of the main power supply line 93.

A second end of the main power supply line 93 is connected to the motor drive circuit 22. A capacitor C0 is connected between the main power supply line 93 and the ground line.
Electric power from the battery 11 of the first battery pack 5 is input to the motor drive circuit 22 via the first power supply line 91 and the main power supply line 93. Power from the battery 16 of the second battery pack 7 is input to the motor drive circuit 22 via the second power supply line 92 and the main power supply line 93.

The motor drive circuit 22 receives either the power from the battery 11 or the power from the battery 16 as described later. That is, either the voltage of the battery 11 or the voltage of the battery 16 is input to the main power supply line 93. The voltage of the battery 11 or the voltage of the battery 16 that is input to the main power supply line 93 is hereinafter referred to as "input battery voltage."

The first power supply line 91 is provided with a first charge suppression circuit 31 and a first switching circuit 36 .
The first switching circuit 36 includes a switch section 37 and an AND circuit 38. The switch section 37 connects or disconnects the first power supply line 91. That is, when the switch section 37 is turned on, a portion of the first power supply line 91 where the switch section 37 is provided becomes conductive. When the switch section 37 is turned off, the portion of the first power supply line 91 where the switch section 37 is provided is cut off, and the supply of power from the battery 11 to the motor 21 is cut off.

The switch section 37 is turned on when the logic level of the signal output from the AND circuit 38 is H level, and turned off when the logic level of the signal output from the AND circuit 38 is L level.
The switch section 37 may be configured in any manner. In this embodiment, the switch section 37 is, for example, an n-channel metal oxide semiconductor field effect transistor (MOSFET). Note that the switch sections 32, 42, and 47, which will be described later, may be configured in any manner, and in this embodiment, they are, for example, n-channel MOSFETs.

The AND circuit 38 includes three signal input terminals, and the first discharge permission signal SA1 (H level signal) output from the first battery pack 5 and the first discharge permission signal SA1 (H level signal) output from the control circuit 23 are input to each of the signal input terminals. The third discharge permission signal SA3 (H level signal) and the second OFF detection signal SB2 (H level signal) output from the second OFF detection circuit 49 are configured to be input. The AND circuit 38 calculates the logical product of the signals input to the signal input terminal, and outputs a signal representing the result of the calculation to the gate of the switch section 37 .

The AND circuit 38 outputs an H level signal when the first discharge enable signal SA1, the third discharge enable signal SA3, and the second off detection signal SB2 are all input (that is, they are all at the H level). do. If any one of the first discharge permission signal SA1, third discharge permission signal SA3, and second off detection signal SB2 is not input (that is, any one is at L level), the AND circuit 38 , outputs an L level signal.

The second off detection signal SB2 is output from the second off detection circuit 49 when both the switch section 42 of the second charge suppression circuit 41 and the switch section 47 of the second switching circuit 46 are turned off, as will be described later. This is an H level signal. If either one of the switch sections 42 and 47 is turned on, the second off detection signal SB2 is not output. Therefore, for example, when the switch section 47 is turned on, the second off detection signal SB2 is not input to the AND circuit 38, the output of the AND circuit 38 becomes L level, and the switch section 37 is turned off. This prevents the switch sections 37 and 47 from being turned on at the same time.

The first charge suppression circuit 31 includes a switch section 32 and a synchronous rectification circuit 33. The switch unit 32 connects or disconnects the first power supply line 91 . That is, when the switch section 32 is turned on, the portion of the first power supply line 91 where the switch section 32 is provided becomes conductive. When the switch section 32 is turned off, the portion of the first power supply line 91 where the switch section 32 is provided is cut off. The switch section 32 is turned on or off by a synchronous rectifier circuit 33.

In the first charge suppression circuit 31 , the gate of the switch section 32 is connected to a synchronous rectifier circuit 33 . The source of the switch section 32 is connected to the first battery pack 5 and also to the synchronous rectifier circuit 33 . A drain of the switch section 32 is connected to a drain of a switch section 37 in the first switching circuit 36 .

The synchronous rectifier circuit 33 turns on or off the switch section 32 based on the voltage between the source and drain of the switch section 32. Specifically, when a current discharged from the first battery pack 5 flows through a parasitic diode existing between the source and drain of the switch section 32, the synchronous rectifier circuit 33 detects the current and switches the switch section 32. Turn on. On the other hand, when the switch section 32 is turned on, the synchronous rectifier circuit 33 detects that discharging from the first battery pack 5 is stopped or that charging current is flowing to the first battery pack 5. If so, turn off the switch section 32. With this configuration, when a current flows from the main body 3 to the battery 11, the switch 32 is turned off to cut off the current, and charging of the battery 11 is suppressed or prevented. Note that, more specifically, the synchronous rectifier circuit 33 controls the gate voltage of the switch section 32 so that the voltage value between the drain and source of the switch section 32 becomes a predetermined voltage value (for example, about 30 mV).

The second power supply line 92 is provided with a second charge suppression circuit 41 and a second switching circuit 46 .
The second switching circuit 46 includes a switch section 47 and an AND circuit 48. The switch section 47 connects or disconnects the second power supply line 92. That is, when the switch section 47 is turned on, a portion of the second power supply line 92 where the switch section 47 is provided becomes conductive. When the switch section 47 is turned off, the part of the second power supply line 92 where the switch section 47 is provided is cut off, and the supply of power from the battery 16 to the motor 21 is cut off.

The switch unit 47 is turned on when the logic level of the signal output from the AND circuit 48 is H level, and turned off when the logic level of the signal output from the AND circuit 48 is L level.
The AND circuit 48 includes three signal input terminals, and receives a second discharge permission signal SA2 (H level signal) output from the second battery pack 7 and a second discharge permission signal SA2 (H level signal) output from the control circuit 23 to each of the signal input terminals. The fourth discharge permission signal SA4 (H level signal) and the first OFF detection signal SB1 (H level signal) output from the first OFF detection circuit 39 are configured to be input. The AND circuit 48 calculates the logical product of the signals input to the signal input terminal, and outputs a signal indicating the result of the calculation to the gate of the switch section 47 .

The AND circuit 48 outputs an H level signal when the second discharge enable signal SA2, the fourth discharge enable signal SA4, and the first off detection signal SB1 are all input (that is, they are all at the H level). do. If any one of the second discharge permission signal SA2, fourth discharge permission signal SA4, and first off detection signal SB1 is not input (that is, any one is at L level), the AND circuit 48 , outputs an L level signal.

The first off detection signal SB1 is output from the first off detection circuit 39 when both the switch section 32 of the first charge suppression circuit 31 and the switch section 37 of the first switching circuit 36 are turned off, as will be described later. This is an H level signal. If either one of the switch sections 32 and 37 is turned on, the first off detection signal SB1 is not output. Therefore, for example, when the switch section 37 is turned on, the first off detection signal SB1 is not input to the AND circuit 48, the output of the AND circuit 48 becomes L level, and the switch section 47 is turned off. This prevents the switch sections 37 and 47 from being turned on at the same time.

The second charge suppression circuit 41 includes a switch section 42 and a synchronous rectification circuit 43. The switch unit 42 connects or disconnects the second power supply line 92. That is, when the switch section 42 is turned on, a portion of the second power supply line 92 where the switch section 42 is provided becomes conductive. When the switch section 42 is turned off, the portion of the second power supply line 92 where the switch section 42 is provided is cut off. The switch section 42 is turned on or off by a synchronous rectifier circuit 43.

In the second charge suppression circuit 41 , the gate of the switch section 42 is connected to a synchronous rectifier circuit 43 . A source of the switch unit 42 is connected to the second battery pack 7 and also to the synchronous rectifier circuit 43 . A drain of the switch section 42 is connected to a drain of a switch section 47 in the second switching circuit 46 .

The synchronous rectifier circuit 43 turns on or off the switch section 42 based on the voltage between the source and drain of the switch section 42 . Specifically, when a current discharged from the second battery pack 7 flows through a parasitic diode existing between the source and drain of the switch section 42, the synchronous rectifier circuit 43 detects the current and switches the switch section 42. Turn on. On the other hand, the synchronous rectifier circuit 43 detects that discharging from the second battery pack 7 is stopped or that charging current is flowing to the second battery pack 7 while the switch section 42 is turned on. If so, the switch section 42 is turned off. With this configuration, when a current flows from the main body 3 to the battery 16, the switch 42 is turned off to cut off the current, and charging of the battery 16 is suppressed or prevented. Note that, more specifically, the synchronous rectifier circuit 43 controls the gate voltage of the switch section 42 so that the voltage value between the drain and source of the switch section 42 becomes a predetermined voltage value (for example, about 30 mV).

A first off detection circuit 39 is connected between the first charge suppression circuit 31 and the first switching circuit 36 in the first power supply line 91 . The first off detection circuit 39 detects that both the switch section 32 of the first charge suppression circuit 31 and the switch section 37 of the first switching circuit 36 are turned off. The first off detection circuit 39 outputs a first off detection signal SB1 (H level signal) when both the switch section 32 and the switch section 37 are turned off. The first off detection circuit 39 does not output the first off detection signal SB1 when either the switch section 32 or the switch section 37 is turned on. In this case, the output port of the first OFF detection circuit 39 becomes L level.

A second off detection circuit 49 is connected between the second charge suppression circuit 41 and the second switching circuit 46 in the second power supply line 92 . The second off detection circuit 49 detects that both the switch section 42 of the second charge suppression circuit 41 and the switch section 47 of the second switching circuit 46 are turned off. The second off detection circuit 49 outputs a second off detection signal SB2 (H level signal) when both the switch section 42 and the switch section 47 are turned off. The second off detection circuit 49 does not output the second off detection signal SB2 when either the switch section 42 or the switch section 47 is turned on. In this case, the output port of the second OFF detection circuit 49 becomes L level.

The motor drive circuit 22 converts the power input from the first battery pack 5 or the second battery pack 7 (hereinafter referred to as “battery power”) into the above-mentioned motor drive power and outputs it to the motor 21. The motor drive power is, for example, three-phase power.

Specifically, the motor drive circuit 22 of this embodiment includes, for example, an inverter (not shown). The inverter includes a U-phase switch pair, a V-phase switch pair, and a W-phase switch pair connected in parallel. Each of the U-phase switch pair, V-phase switch pair, and W-phase switch pair includes two semiconductor switching elements connected in series.

The U-phase switch pair, the V-phase switch pair, and the W-phase switch pair are each connected to the motor 21. The U-phase switch pair outputs a U-phase voltage to the motor 21. The U-phase voltage is the voltage at the connection point of two series-connected semiconductor switching elements in the U-phase switch pair. The V-phase switch pair outputs a V-phase voltage to the motor 21. The V-phase voltage is the voltage at the connection point of two series-connected semiconductor switching elements in the V-phase switch pair. The W-phase switch pair outputs a W-phase voltage to the motor 21. The W-phase voltage is the voltage at the connection point of two series-connected semiconductor switching elements in the W-phase switch pair.

The motor drive circuit 22 is connected to the control circuit 23 by a drive line 90. A motor drive command SD is input to the motor drive circuit 22 from the control circuit 23 via a drive line 90 . When the motor drive command SD is input to the motor drive circuit 22, each of the six semiconductor switching elements is turned on or off according to the motor drive command SD, thereby controlling the above-mentioned U-phase voltage, V-phase voltage, and W-phase voltage. Motor drive power including voltage is generated.

The drive line 90 is provided with a cutoff switch 29 . The cutoff switch 29 conducts or cuts off the drive line 90. When the cutoff switch 29 is turned on, the motor drive command SD output from the control circuit 23 is input to the motor drive circuit 22 via the cutoff switch 29. When the cutoff switch 29 is turned off, transmission of the motor drive command SD from the control circuit 23 to the motor drive circuit 22 is cut off.

The cutoff switch 29 is turned on or off according to the cutoff information SS output from the cutoff latch circuit 70. That is, the cutoff switch 29 is turned on when the logic level of the cutoff information SS is H level indicating command permission. The cutoff switch 29 is turned off when the logic level of the cutoff information SS is L level indicating command cutoff.

The cutoff switch 29 may be configured in any manner. The cutoff switch 29 may be, for example, a MOSFET.
The overvoltage detection circuit 50, the current detection circuit 55, and the overheat detection section 60 are provided to detect five abnormal states. The five abnormal states include an overvoltage state, an overcurrent state, a U-phase overheating state, a V-phase overheating state, and a W-phase overheating state.

An overvoltage state is, for example, a state in which the value of the input battery voltage input to the motor drive circuit 22 via the main power supply line 93 (hereinafter referred to as "input battery voltage value") is higher than a specified normal voltage range. Indicates the state in which An overcurrent state is, for example, a state in which the value of the current flowing to the motor 21 via the motor drive circuit 22 (hereinafter referred to as "motor current value") is higher than a specified normal current range. show.

The U-phase overheating state indicates, for example, a state in which the U-phase temperature, which will be described later, is higher than a specified normal temperature range. The V-phase overheating state refers to, for example, a state in which the V-phase temperature, which will be described later, is higher than a specified normal temperature range. The W-phase overheating state indicates, for example, a state in which the W-phase temperature, which will be described later, is higher than a specified normal temperature range.

The overvoltage detection circuit 50, the current detection circuit 55, and the overheat detection section 60 all detect the corresponding abnormal state through hardware processing without performing software processing based on a program, as described later.

The overvoltage detection circuit 50 detects an input battery voltage value and outputs information based on the detected input battery voltage value. Specifically, overvoltage detection circuit 50 outputs voltage signal SV. Voltage signal SV is an analog signal indicating the input battery voltage value.

The overvoltage detection circuit 50 further has a function of detecting an overvoltage condition. That is, the overvoltage detection circuit 50 outputs an overvoltage signal So1 indicating that an overvoltage state has occurred when the input battery voltage value is, for example, equal to or higher than the first voltage threshold higher than the above-mentioned normal voltage range. .

Further, the second pseudo signal SF2 is inputted to the overvoltage detection circuit 50 from the control circuit 23. The second pseudo signal SF2 is output from the control circuit 23 when the control circuit 23 executes an overvoltage protection function diagnosis to be described later.

The overvoltage detection circuit 50 may be configured as shown in FIG. 3, for example. As shown in FIG. 3, the overvoltage detection circuit 50 includes a comparator 51, a buffer 52, resistors R3 and R4, a capacitor C1, and a diode D1. The diode D1, the resistor R3, and the resistor R4 are connected in series between the main power supply line 93 and the ground line in this order. Capacitor C1 is connected between the cathode of diode D1 and the ground line. A circuit including diode D1 and capacitor C1 functions as a so-called peak hold circuit.

The voltage at the connection point between resistor R3 and resistor R4 is output as a voltage signal SV. Further, the voltage at the connection point between the resistor R3 and the resistor R4 is input to the comparator 51. The comparator 51 is configured not to output the overvoltage signal So1 when the input battery voltage value is lower than the first voltage threshold, but to output the overvoltage signal So1 when the input battery voltage value is equal to or higher than the first voltage threshold. .

The buffer 52 is configured to receive the second pseudo signal SF2. The output signal of the buffer 52 is input to the comparator 51. The voltage value of the second pseudo signal SF2 is a value at which the overvoltage signal So1 is output from the comparator 51 if the overvoltage detection circuit 50 is normal. Therefore, if the overvoltage detection circuit 50 is normal, the overvoltage signal So1 is output when the second pseudo signal SF2 is input even if no overvoltage state actually occurs. In other words, the second pseudo signal SF2 is a signal for pseudo-generating an overvoltage state.

The current detection circuit 55 detects a motor current value and outputs information based on the detected motor current value. Specifically, the current detection circuit 55 outputs a current signal SC and an overcurrent signal So2. The current signal SC is an analog signal indicating the motor current value.

The current detection circuit 55 further has a function of detecting an overcurrent condition. That is, the current detection circuit 55 outputs an overcurrent signal So2 indicating that an overcurrent state has occurred when the motor current value is, for example, equal to or higher than the first current threshold value which is higher than the above-mentioned normal current range. do.

The current detection circuit 55 may be configured as shown in FIG. 3, for example. As shown in FIG. 3, the current detection circuit 55 includes an amplifier circuit 57, a comparator 56, and a resistor R5. Resistor R5 is provided in the current-carrying path through which the motor current flows. Therefore, a voltage corresponding to the value of the motor current is generated between both ends of the resistor R5. Amplification circuit 57 amplifies the voltage across resistor R5.

The voltage amplified by the amplifier circuit 57 is output as a current signal SC. Further, the voltage amplified by the amplifier circuit 57 is input to the comparator 56. The comparator 56 is configured not to output the overcurrent signal So2 when the motor current value is lower than the first current threshold, but to output the overcurrent signal So2 when the motor current value is greater than or equal to the first current threshold. .

Overheat detection section 60 detects the temperature of motor drive circuit 22 . More specifically, the overheat detection section 60 includes a first overheat detection circuit 61, a second overheat detection circuit 62, and a third overheat detection circuit 63, as shown in FIG.

The first overheat detection circuit 61 detects the temperature of the U-phase switch pair in the motor drive circuit 22 (hereinafter referred to as "U-phase temperature"). Specifically, the U-phase temperature may be, for example, the temperature of one of the two semiconductor switching elements included in the U-phase switch pair. In this case, the U-phase temperature may be the temperature of either of the two semiconductor switching elements; for example, the U-phase temperature may be the temperature of the one of the two semiconductor switching elements that is turned on for a relatively longer period. good.

The first overheat detection circuit 61 outputs information based on the detected U-phase temperature. Specifically, the first overheat detection circuit 61 outputs a first temperature signal STM1 and a first overheat signal So31. The first temperature signal STM1 is an analog signal indicating the U-phase temperature.

The first overheat detection circuit 61 further has a function of detecting a U-phase overheat state. That is, the first overheating detection circuit 61 detects a first overheating state, which indicates that a U-phase overheating state has occurred, when the U-phase temperature is, for example, equal to or higher than the first U-phase temperature threshold, which is higher than the above-mentioned normal temperature range. Outputs overheating signal So31.

Further, the third pseudo signal SF31 is inputted to the first overheat detection circuit 61 from the control circuit 23. The third pseudo signal SF31 is output from the control circuit 23 when the control circuit 23 executes a first overheat protection function diagnosis, which will be described later.

The first overheat detection circuit 61 may be configured as shown in FIG. 3, for example. As shown in FIG. 3, the first overheat detection circuit 61 includes a temperature detection element 66, a comparator 67, a switch 68, and a resistor R6. The temperature detection element 66 is provided at or near the object for which the U-phase temperature is to be detected so as to be able to detect the above-mentioned U-phase temperature. In this embodiment, the temperature detection element 66 is, for example, an NTC thermistor having negative resistance-temperature characteristics.

The resistor R6 and the temperature detection element 66 are connected in series between the control power supply line and the ground line in this order. The switch 68 is connected between the connection point between the resistor R6 and the temperature detection element 66 and the ground line.

The voltage at the connection point between the resistor R6 and the temperature detection element 66 is output as the first temperature signal STM1. Further, the voltage at the connection point between the resistor R6 and the temperature detection element 66 is input to the comparator 67. The comparator 67 does not output the first overheating signal So31 when the U-phase temperature is lower than the first U-phase temperature threshold, and outputs the first overheating signal So31 when the U-phase temperature is equal to or higher than the first U-phase temperature threshold. It is configured.

The switch 68 is normally turned off when the third pseudo signal SF31 is not input. The switch 68 is turned on while the third pseudo signal SF3 is being input. When the switch 68 is turned on, the voltage input to the comparator 67 becomes approximately 0V. In this case, if the first overheat detection circuit 61 is normal, the comparator 67 outputs the first overheat signal So31. That is, even if a U-phase overheating state does not actually occur, when the third pseudo signal SF31 is input, a U-phase overheating state pseudo-occurs.

In this embodiment, the second overheat detection circuit 62 and the third overheat detection circuit 63 are both configured in the same manner as the first overheat detection circuit 61 except for the position where the temperature detection element 66 is provided.

That is, the second overheat detection circuit 62 detects the temperature of the V-phase switch pair in the motor drive circuit 22 (hereinafter referred to as "V-phase temperature"). Specifically, like the U-phase temperature, the V-phase temperature may be, for example, the temperature of one of the two semiconductor switching elements included in the V-phase switch pair. The second overheat detection circuit 62 outputs an analog second temperature signal STM2 indicating the detected V-phase temperature.

The second overheating detection circuit 62 further has a function of detecting a V-phase overheating state. That is, the second overheating detection circuit 62 detects a second overheating state, which indicates that a V-phase overheating state has occurred, when the V-phase temperature is, for example, equal to or higher than the first V-phase temperature threshold, which is higher than the above-mentioned normal temperature range. Outputs overheating signal So32.

Further, the second overheat detection circuit 62 receives a fourth pseudo signal SF32 from the control circuit 23. The fourth pseudo signal SF32 is output from the control circuit 23 when the control circuit 23 executes a second overheat protection function diagnosis described later. Even if a V-phase overheating state does not actually occur, when the fourth pseudo signal SF32 is input, a V-phase overheating state pseudo-occurs, and a second overheating signal So32 is output.

The third overheat detection circuit 63 detects the temperature of the W-phase switch pair in the motor drive circuit 22 (hereinafter referred to as "W-phase temperature"). Specifically, like the U-phase temperature, the W-phase temperature may be, for example, the temperature of one of the two semiconductor switching elements included in the W-phase switch pair. The third overheat detection circuit 63 outputs an analog third temperature signal STM3 indicating the detected W-phase temperature.

The third overheating detection circuit 63 further has a function of detecting a W-phase overheating state. That is, the third overheating detection circuit 63 detects the third overheating state, which indicates that the W-phase overheating state has occurred, when the W-phase temperature is, for example, equal to or higher than the first W-phase temperature threshold, which is higher than the above-mentioned normal temperature range. Outputs overheating signal So33.

Further, the fifth pseudo signal SF33 is inputted from the control circuit 23 to the third overheat detection circuit 63. The fifth pseudo signal SF33 is output from the control circuit 23 when the control circuit 23 executes a third overheating protection function diagnosis, which will be described later. Even if the W-phase overheating state does not actually occur, when the fifth pseudo signal SF33 is input, a W-phase overheating state pseudo-occurs, and the third overheating signal So33 is output.

Note that the first U-phase temperature threshold, the first V-phase temperature threshold, and the first W-phase temperature threshold may all be the same value, any two of them may be the same value, or they may all be different values. Good too.
Trigger determination information STR is input to the cutoff latch circuit 70 . Further, the overvoltage signal So1, the overcurrent signal So2, the first overheating signal So31, the second overheating signal So32, and the third overheating signal So33 can be input to the cutoff latch circuit 70. The cutoff latch circuit 70 outputs cutoff information SS based on the input information and each signal. Further, the cutoff latch circuit 70 outputs abnormality detection information Sor.

The cutoff latch circuit 70 outputs H-level cutoff information SS indicating command permission and turns on the cutoff switch 29 when the state of the electric working machine 1 is a drive permission state in which the motor 21 can be driven. . On the other hand, when the state of the electric working machine 1 is a drive prohibited state in which the motor 21 should not be driven, the cutoff latch circuit 70 outputs L-level cutoff information SS indicating a command cutoff and activates the cutoff switch 29. Turn off.

In this embodiment, the drive permission state is defined by the trigger determination information STR indicating a trigger on state, and further includes an overvoltage signal So1, an overcurrent signal So2, a first overheating signal So31, a second overheating signal So32, and a third overheating signal. This includes an abnormality undetected state in which no So33 is input (that is, none of the five abnormal states described above are detected).

In this embodiment, the driving prohibited state is defined as whether the trigger determination information STR indicates a trigger off state, or the overvoltage signal So1, the overcurrent signal So2, the first overheating signal So31, the second overheating signal So32, and the third overheating signal. This includes an abnormality detection state in which one or more of So33 is input (that is, one or more of the five abnormality states described above is detected).

The cutoff latch circuit 70 further includes a cutoff latch function. The cutoff latch function changes the cutoff information SS from information indicating command permission to information indicating command cutoff due to a change from an abnormality undetected state to an abnormality detected state while the trigger operation unit 20 is turned on. This function continues to output the cutoff information SS indicating command cutoff even if the state changes to the abnormality undetected state again after that, until the trigger operation section 20 is turned off.

The cutoff latch circuit 70 may be configured as shown in FIG. 3, for example. As shown in FIG. 3, the cutoff latch circuit 70 includes a first flip-flop 71, an OR circuit 72, a NOT circuit 73, an OR circuit 74, a second flip-flop 75, an AND circuit 76, and a resistor R7. , R8, and capacitors C2 and C3. In this embodiment, the first flip-flop 71 and the second flip-flop 75 are both D-type flip-flops. That is, the first flip-flop 71 and the second flip-flop 75 switch the data input terminal to the data input terminal every time a rising edge (i.e., change in logic level from L level to H level) of the signal input to the clock input terminal occurs. A signal having the same logic level as the signal input to the output terminal is output from the output terminal. Then, until the next rising edge occurs again, even if the logic level of the signal input to the data input terminal changes, the logic level of the signal output from the output terminal is maintained.

The overvoltage signal So1, the overcurrent signal So2, the first overheating signal So31, the second overheating signal So32, and the third overheating signal So33 can be input to the OR circuit 72. The OR circuit 72 calculates the logical sum of five input signals and outputs the result of the calculation.

The trigger determination information STR is input to the clock input terminal of the first flip-flop 71 and the AND circuit 76 . Trigger determination information STR is further input to OR circuit 74 via capacitor C2.

A resistor R8 is connected between the connection point between the capacitor C2 and the OR circuit 74 and the ground line. That is, the circuit including the capacitor C2 and the resistor R8 functions as a differentiating circuit that differentiates the trigger determination information STR and inputs it to the OR circuit 74.

The output signal of the OR circuit 72 is input to the NOT circuit 73 and also to the OR circuit 74 via the resistor R7. The output signal of the OR circuit 72 is further input to the control circuit 23 as abnormality detection information Sor.

A capacitor C3 is connected between the connection point between the resistor R7 and the OR circuit 74 and the ground line. That is, the circuit including resistor R7 and capacitor C3 functions as an integrating circuit that integrates the output signal of OR circuit 72 and inputs it to OR circuit 74. The output signal of the OR circuit 74 is input to the clock input terminal of the second flip-flop 75.

The output signal of the NOT circuit 73 is input to the data input terminals of the first flip-flop 71 and the second flip-flop 75. Both the output signal of the first flip-flop 71 and the output signal of the second flip-flop 75 are input to the AND circuit 76.

The cutoff latch circuit 70 configured in this manner operates, for example, as follows. For example, assume that the logic level of the trigger determination information STR is an L level indicating a trigger off state. In this case, the output signal of the AND circuit 76 becomes L level. In other words, in this case, the shutoff information SS indicates commanded shutoff. Therefore, the cutoff switch 29 is turned off.

Further, for example, assume that none of the overvoltage signal So1, overcurrent signal So2, first overheating signal So31, second overheating signal So32, and third overheating signal So33 is input to the OR circuit 72. In this case, the logic level of the data input terminals of the first flip-flop 71 and the second flip-flop 75 becomes H level.

At this time, it is assumed that the logic level of the trigger determination information STR changes to H level indicating a trigger-on state. In this case, rising edges occur in the signals input to the input terminals of the first flip-flop circuit 71 and the second flip-flop circuit 75, so that the signals input to the input terminals of the first flip-flop circuit 71 and the second flip-flop circuit 75 are output from the output terminals of the first flip-flop circuit 71 and the second flip-flop circuit 75. The logic level of the signal becomes H level. As a result, the output signal of the AND circuit 76 becomes H level. That is, in this case, the cutoff information SS changes to information indicating command permission. Therefore, the cutoff switch 29 is turned on.

When the cutoff information SS indicating command permission is output, any one or more of the overvoltage signal So1, the overcurrent signal So2, the first overheating signal So31, the second overheating signal So32, and the third overheating signal So33 is in the OR circuit. 72 is input. In this case, the logic level of the data input terminal of the second flip-flop 75 becomes L level, and then the logic level of the clock input terminal of the second flip-flop 75 becomes H level. The time difference from the timing when the logic level of the data input terminal becomes L level to the timing when the logic level of the clock input terminal becomes H level is based on the time constant of the integrating circuit including resistor R7 and capacitor C3. As a result, the output signal of the second flip-flop 75 becomes L level, and the output signal of the AND circuit 76 becomes L level. In other words, in this case, the shutoff information SS changes to information indicating commanded shutoff. Therefore, the cutoff switch 29 is turned off.

It is assumed that after that, the abnormality is recovered and all the input terminals of the OR circuit 72 change to L level. In this case, the logic levels of the data input terminals of the first flip-flop 71 and the second flip-flop 75 change to H level, but while the trigger determination information STR is maintained at the H level, the first flip-flop 71 and the The output signal of the second flip-flop 75 does not change, and the shutoff information SS is maintained at information indicating commanded shutoff. Therefore, the cutoff switch 29 is also maintained in an off state.

After that, it is assumed that the trigger operation section 20 is turned off and then turned on again. In this case, the logic levels of the clock input terminals of the first flip-flop 71 and the second flip-flop 75 change to L level, and then change to H level again. Therefore, the output signals of the first flip-flop 71 and the second flip-flop 75 change to H level. As a result, the output signal of the AND circuit 76 changes to H level, and the cutoff information SS changes to information indicating command permission. Therefore, the cutoff switch 29 is turned on.

In this way, the cutoff latch circuit 70 achieves various functions including the function of outputting the cutoff information SS and the cutoff latch function through hardware processing without performing software processing.
The control circuit 23 is operated by the power supply voltage input from the above-mentioned power supply circuit. The control circuit 23 includes a microcomputer including a CPU 24 and a memory 25. Memory 25 may include semiconductor memory such as RAM, ROM, and flash memory. The memory 25 stores various programs and data that the CPU 24 reads and executes to achieve various functions of the electric working machine 1. These various functions are not limited to software processing as described above, and some or all of them may be achieved using hardware that is a combination of logic circuits, analog circuits, and the like.

The control circuit 23 includes first trigger information ST1, second trigger information ST2, trigger determination information STR, first discharge permission signal SA1, second discharge permission signal SA2, first off detection signal SB1, and second off detection signal SB2. , cutoff information SS, voltage signal SV, current signal SC, first temperature signal STM1 to third temperature signal STM3, and abnormality detection information Sor are input. Information indicating the operation of the main power switch 30 by the user is further input to the control circuit 23 from the main power switch 30 .

The control circuit 23 turns on or off the main power of the electric working machine 1 based on information input from the main power switch 30. The main power switch 30 of this embodiment is, for example, a momentary switch as described above. Therefore, the control circuit 23 alternately switches the main power supply on or off each time the main power switch 30 is pushed back as described above. Further, the control circuit 23 achieves various functions based on the above-mentioned information and signals inputted to the control circuit 23.

Further, the control circuit 23 of the present embodiment turns off the main power when the main power switch 30 is not operated and the trigger operation section 20 is not pulled or operated for a specified time after the main power is turned on. Set to .

The control circuit 23 outputs either the third discharge permission signal SA3 or the fourth discharge permission signal SA4 when both the first discharge permission signal SA1 and the second discharge permission signal SA2 are input. In this case, the switch section 37 on the first power supply line 91 or the switch section 47 on the second power supply line 92 is turned on.

When the first discharge permission signal SA1 is input but the second discharge permission signal SA2 is not input, the control circuit 23 outputs the third discharge permission signal SA3 and does not output the fourth discharge permission signal SA4. In this case, the switch section 37 on the first power supply line 91 is turned on, and the switch section 47 on the second power supply line 92 is turned off.

When the second discharge permission signal SA2 is input but the first discharge permission signal SA1 is not input, the control circuit 23 outputs the fourth discharge permission signal SA4 and does not output the third discharge permission signal SA3. In this case, the switch section 47 on the second power supply line 92 is turned on, and the switch section 37 on the first power supply line 91 is turned off.

The control circuit 23 drives the motor 21 by outputting a motor drive command SD to the motor drive circuit 22 when the trigger operation unit 20 is turned on during the main power ON period when the main power is set to ON. do.

The control circuit 23 determines that the trigger operation section 20 has been turned on when the first trigger information ST1 and the second trigger information ST2 both indicate a trigger-on state (that is, the logic level is H level). , outputs a motor drive command SD. If either one of the first trigger information ST1 and the second trigger information ST2 indicates a trigger off state (that is, the logic level is at L level), the control circuit 23 determines that the trigger operation unit 20 has been turned off. The motor drive command SD is not output.

The control circuit 23 outputs trigger detection information ST0 to the first battery pack 5 and the second battery pack 7. Trigger detection information ST0 indicates whether the trigger operation section 20 is turned on. If the control circuit 23 determines that the trigger operation unit 20 is turned off, it outputs trigger detection information ST0 with a logic level of L level indicating that the trigger operation unit 20 is turned off. If the control circuit 23 determines that the trigger operation section 20 is turned on, it outputs trigger detection information ST0 with a logic level of H level, which indicates that the trigger operation section 20 is turned on. Note that while the power supply voltage is not supplied to the control circuit 23 and the control circuit 23 stops operating, the logic level of the trigger detection information ST0 is maintained at the L level.

When the control circuit 23 outputs the motor drive command SD during the main power ON period, the control circuit 23 stores in the memory 25 a motor drive history indicating that the motor 21 was driven.
The control circuit 23 has an abnormality detection function. Specifically, the abnormality detection function includes an overvoltage detection function, an overcurrent detection function, and an overheat detection function. These abnormality detection functions are achieved in the control circuit 23 by the CPU 24 executing main processing to be described later. That is, these anomaly detection functions are achieved based on software.

The overvoltage detection function is a function of detecting the above-mentioned overvoltage state. That is, the control circuit 23 detects an overvoltage state based on the input battery voltage value indicated by the voltage signal SV input from the overvoltage detection circuit 50. For example, the control circuit 23 determines that an overvoltage state has occurred when the input battery voltage value is equal to or higher than the second voltage threshold, which is higher than the above-mentioned normal voltage range. The second voltage threshold may be, for example, the same value as the first voltage threshold, larger than the first voltage threshold, or smaller than the first voltage threshold.

The overcurrent detection function is a function that detects the above-mentioned overcurrent state. That is, the control circuit 23 detects an overcurrent state based on the motor current value indicated by the current signal SC input from the current detection circuit 55. For example, the control circuit 23 determines that an overcurrent state has occurred when the motor current value is equal to or higher than the second current threshold value, which is higher than the above-mentioned normal current range. For example, the second current threshold may be the same value as the first current threshold, may be larger than the first current threshold, or may be smaller than the first current threshold.

More specifically, the overheat detection function includes a first overheat detection function, a second overheat detection function, and a third overheat detection function.
The first overheating detection function is a function of detecting the above-mentioned U-phase overheating state. That is, the control circuit 23 detects the U-phase overheating state based on the U-phase temperature indicated by the first temperature signal STM1 input from the first overheating detection circuit 61. For example, the control circuit 23 determines that the U-phase overheating state has occurred when the U-phase temperature is equal to or higher than the second U-phase temperature threshold, which is higher than the above-mentioned normal temperature range. The second U-phase temperature threshold, for example, may be the same value as the first U-phase temperature threshold, may be greater than the first U-phase temperature threshold, or may be smaller than the first U-phase temperature threshold.

The second overheating detection function is a function of detecting the above-mentioned V-phase overheating state. That is, the control circuit 23 detects the V-phase overheating state based on the V-phase temperature indicated by the second temperature signal STM2 input from the second overheating detection circuit 62. For example, the control circuit 23 determines that the V-phase overheating state has occurred when the V-phase temperature is equal to or higher than the second V-phase temperature threshold, which is higher than the above-mentioned normal temperature range. For example, the second V-phase temperature threshold may be the same value as the first V-phase temperature threshold, may be greater than the first V-phase temperature threshold, or may be smaller than the first V-phase temperature threshold.

The third overheating detection function is a function of detecting the above-mentioned W-phase overheating state. That is, the control circuit 23 detects the W-phase overheating state based on the W-phase temperature indicated by the third temperature signal STM3 inputted from the third overheating detection circuit 63. For example, the control circuit 23 determines that the W-phase overheating state has occurred when the W-phase temperature is equal to or higher than the second W-phase temperature threshold, which is higher than the above-mentioned normal temperature range. For example, the second W-phase temperature threshold may be the same value as the first W-phase temperature threshold, may be greater than the first W-phase temperature threshold, or may be smaller than the first W-phase temperature threshold.

Note that the second U-phase temperature threshold, the second V-phase temperature threshold, and the second W-phase temperature threshold may all be the same value, any two of them may be the same value, or they may all be different values. Good too.
If any abnormality is detected by the above-mentioned abnormality detection function while outputting the motor drive command SD, the control circuit 23 will not output the motor drive command SD even if the trigger operation section 20 is turned on. Then, the motor 21 is stopped. In this case, an abnormal drive history indicating that an abnormality was detected during motor drive is stored in the memory 25.

(3) Description of self-diagnosis function The control circuit 23 has a self-diagnosis function. The self-diagnosis function is a function that executes a plurality of self-diagnoses corresponding to a plurality of diagnosis items one by one at each specific diagnosis timing according to a prescribed order.

In this embodiment, for example, six types of diagnostic items are provided. The first diagnosis item is a trigger detection function diagnosis. The second diagnosis item is power supply line function diagnosis. The third diagnosis item is the first overheat protection function diagnosis. The fourth diagnosis item is a second overheat protection function diagnosis. The fifth diagnosis item is the third overheat protection function diagnosis. The sixth diagnosis item is an overvoltage protection function diagnosis.

The prescribed order for performing self-diagnosis of each diagnostic item may be any order. The prescribed order of this embodiment is, for example, the first diagnostic item is the first diagnostic item, the second is the second diagnostic item, the third is the third diagnostic item, the fourth is the fourth diagnostic item, the fifth is the fifth diagnostic item, and so on. The 6th item is the 6th diagnostic item. After the sixth diagnosis item, the process returns to the first diagnosis item, and the diagnosis is performed again in the above order from the first diagnosis item.

The diagnosis timing of each self-diagnosis corresponding to each diagnosis item is, for example, the main power off timing, except for the power supply line function diagnosis. The main power off timing is when the main power is turned off. Note that the main power off timing may be any timing immediately after the main power is turned off until a certain period of time has elapsed.

One of the reasons why the diagnosis timing of each self-diagnosis other than the power supply line function diagnosis is set to the main power off timing is as follows. That is, the control circuit 23 of this embodiment is configured to interrupt the self-diagnosis when the trigger operation section 20 is turned on during execution of the self-diagnosis. If the self-diagnosis is executed at a timing when the trigger operation unit 20 is unlikely to be turned on, the possibility that the self-diagnosis will be interrupted is also reduced. The main power off timing is considered to be the timing at which the user of the electric working machine 1 expresses his/her intention to finish the work using the electric working machine 1, and the trigger operation unit 20 is turned off for a while from that timing. It is unlikely to be turned on. Therefore, in this embodiment, the diagnosis timing of each self-diagnosis except for the power supply line function diagnosis is set to the main power-off timing.

At the main power off timing, if the motor drive history is not stored during the main power on period (hereinafter referred to as the "immediate on period") immediately before the main power off timing (that is, the motor 21 is If the abnormal drive history is stored during the last ON period (that is, if an abnormality is detected and the motor 21 is stopped while it is being driven), the self-diagnosis is not executed. In this case, the diagnostic items at the next diagnostic timing are set again to the diagnostic items that were not executed this time.

The execution timing of the power supply line function diagnosis is, for example, the main power supply ON timing. The main power on timing is when the main power is turned on. Note that the main power on timing may be any timing immediately after the main power is turned on until a certain period of time has elapsed.

The control circuit 23 stores in the memory 25 a self-diagnosis history indicating the results of self-diagnosis for each diagnosis item. Specifically, if the diagnosis result indicates an abnormality, the control circuit 23 stores information indicating the abnormality determination as the self-diagnosis history. In this case, the control circuit 23 performs the self-diagnosis again using the same diagnosis items as this time at the next main power supply turn-on timing. If the diagnosis result indicates normality, the control circuit 23 stores information indicating normality determination as a self-diagnosis history.

If the diagnosis is not completed normally and is interrupted, the control circuit 23 performs the self-diagnosis for the same diagnosis item again at the first regular diagnosis timing corresponding to the diagnosis item after the interruption. Execute.

In the trigger detection function diagnosis, the control circuit 23 diagnoses whether the trigger detection circuit 80 and the cutoff latch circuit 70 operate normally. Specifically, the control circuit 23 outputs the first pseudo signal SF1 to the trigger detection circuit 80, thereby making the first trigger information ST1 pseudo-information indicating a trigger-on state (ie, H level).

The control circuit 23 executes diagnosis based on the first trigger information ST1, second trigger information ST2, and cutoff information SS input to the control circuit 23 while outputting the first pseudo signal SF1. At the timing when the trigger detection function diagnosis is executed, the main power switch 30 is turned off. Therefore, if the trigger detection circuit 80 and the cutoff latch circuit 70 are normal, when the first pseudo signal SF1 is output, the first trigger information ST1 becomes H level, the second trigger information ST2 becomes L level, and the cutoff information SS should be at L level.

When each of the above information is proper information (that is, the first trigger information ST1 is at H level, and the second trigger information ST2 and cutoff information SS are at L level), the control circuit 23 controls the trigger detection circuit 80 and the cutoff latch. It is determined that the circuit 70 operates normally. In this case, the self-diagnosis result is determined to be normal, and a self-diagnosis history indicating the normality determination is stored in the memory 25.

If the first trigger information ST1 is not proper information, the control circuit 23 determines that the trigger detection circuit 80 does not operate normally. In this case, the self-diagnosis result is determined to be abnormal, and the self-diagnosis history indicating the abnormality determination is stored in the memory 25.

If the cutoff information SS is not proper information, the control circuit 23 determines that the trigger detection circuit 80 or the cutoff latch circuit 70 does not operate normally. In this case, the self-diagnosis result is determined to be abnormal, and the self-diagnosis history indicating the abnormality determination is stored in the memory 25.

If the second trigger information ST2 is not proper information, the control circuit 23 may determine that the trigger detection circuit 80 does not operate normally, but in this embodiment, the diagnosis is interrupted.
In the power supply line function diagnosis, the control circuit 23 diagnoses whether the first switching circuit 36 and the second switching circuit 46 operate normally.

Specifically, the control circuit 23 outputs the third discharge permission signal SA3 when the first discharge permission signal SA1 is not input from the first battery pack 5. When the first off detection signal SB1 is input from the first off detection circuit 39 while the control circuit 23 is outputting the third discharge permission signal SA3 (that is, when both the switch sections 32 and 37 are off) ), it is determined that the first switching circuit 36 is normal. If the first off detection signal SB1 is no longer input from the first off detection circuit 39 while outputting the third discharge permission signal SA3, the control circuit 23 determines that the first switching circuit 36 is not normal. do.

Furthermore, if the second discharge permission signal SA2 is not input from the second battery pack 7, the control circuit 23 outputs a fourth discharge permission signal SA4. When the second OFF detection signal SB2 is input from the second OFF detection circuit 49 while the control circuit 23 is outputting the fourth discharge permission signal SA4 (that is, when the switch sections 42 and 47 are both OFF), ), it is determined that the second switching circuit 46 is normal. If the second off detection signal SB2 is no longer input from the second off detection circuit 49 while outputting the fourth discharge permission signal SA4, the control circuit 23 determines that the second switching circuit 46 is not normal. do.

If the control circuit 23 does not determine that the line is not normal in the power supply line function diagnosis, it determines that the self-diagnosis result is normal, and stores in the memory 25 a self-diagnosis history indicating the normality determination. If the control circuit 23 determines that either the first switching circuit 36 or the second switching circuit 46 is not normal, the control circuit 23 determines that the self-diagnosis result is abnormal, and stores the self-diagnosis history indicating the abnormality determination in the memory. 25.

Note that one of the reasons why the diagnosis timing of the power supply line function diagnosis is set to the main power supply on timing is as follows. That is, taking the first battery pack 5 as an example, when the battery abnormality detection circuit 12 does not detect any abnormality, the battery abnormality detection circuit 12 recognizes that the trigger operation unit 20 has been turned on based on the trigger detection information STO. , outputs the first discharge permission signal SA1 for a certain period of time from the time of recognition. Depending on the usage status of the user, the main power source may be turned off before a certain period of time has elapsed since the trigger operation section 20 was turned on. That is, there is a possibility that the main power source is turned off while the first discharge permission signal SA1 is still being output. In this case, since the first discharge permission signal SA1 is output, the power supply line function diagnosis cannot be properly executed. On the other hand, the main power supply ON timing is a state in which the user is about to use the electric working machine 1, and it is unlikely that the first discharge permission signal SA1 is output. Therefore, in this embodiment, the diagnosis timing of the power supply line function diagnosis is set to the main power supply on timing.

In the first overheat protection function diagnosis, the control circuit 23 diagnoses whether the first overheat detection circuit 61 and cutoff latch circuit 70 operate normally. Specifically, the control circuit 23 outputs the third pseudo signal SF31 to the first overheat detection circuit 61 to generate a pseudo U-phase overheat state. The control circuit 23 executes diagnosis based on the first temperature signal STM1 and the abnormality detection information Sor input to the control circuit 23 while outputting the third pseudo signal SF31.

When the U-phase temperature indicated by the first temperature signal STM1 is equal to or higher than a specific U-phase threshold and the abnormality detection information Sor is at H level, the control circuit 23 controls the first overheating detection circuit 61 and the cutoff latch circuit. 70 is determined to operate normally. In this case, the self-diagnosis result is determined to be normal, and a self-diagnosis history indicating the normality determination is stored in the memory 25. Note that the U-phase threshold may be any value. The U-phase threshold value may be, for example, a specific value higher than the above-mentioned normal temperature range. The U-phase threshold may be, for example, the same value as the first U-phase temperature threshold or the second U-phase temperature threshold described above.

If the U-phase temperature indicated by the first temperature signal STM1 is lower than the U-phase threshold, the control circuit 23 determines that the first overheat detection circuit 61 does not operate normally. In this case, the self-diagnosis result is determined to be abnormal, and the self-diagnosis history indicating the abnormality determination is stored in the memory 25.

When the U-phase temperature indicated by the first temperature signal STM1 is equal to or higher than the U-phase threshold (that is, the first overheating detection circuit 61 is normal) and the abnormality detection information Sor is at L level, the control circuit 23 activates the cutoff latch. It is determined that the circuit 70 does not operate normally. In this case, the self-diagnosis result is determined to be abnormal, and the self-diagnosis history indicating the abnormality determination is stored in the memory 25.

In the second overheat protection function diagnosis, the control circuit 23 outputs the fourth pseudo signal SF32 to the second overheat detection circuit 62. Then, based on the second temperature signal STM2 and the abnormality detection information Sor, it is diagnosed whether or not the second overheat detection circuit 62 and cutoff latch circuit 70 operate normally in the same manner as the first overheat protection function diagnosis.

In the third overheat protection function diagnosis, the control circuit 23 outputs the fifth pseudo signal SF33 to the third overheat detection circuit 63. Then, based on the third temperature signal STM3 and the abnormality detection information Sor, it is diagnosed whether the third overheat detection circuit 63 and the cutoff latch circuit 70 operate normally in the same manner as the first overheat protection function diagnosis.

In the overvoltage protection function diagnosis, the control circuit 23 diagnoses whether the overvoltage detection circuit 50 and the cutoff latch circuit 70 operate normally. Specifically, the control circuit 23 outputs the second pseudo signal SF2 to the overvoltage detection circuit 50 to generate a pseudo overvoltage state. The control circuit 23 executes diagnosis based on the voltage signal SV and the abnormality detection information Sor input to the control circuit 23 while outputting the second pseudo signal SF2.

The control circuit 23 determines that the overvoltage detection circuit 50 and cutoff latch circuit 70 are normal when the input battery voltage value indicated by the voltage signal SV is equal to or higher than a specific voltage determination threshold and the abnormality detection information Sor is at H level. It is judged that it works. In this case, the self-diagnosis result is determined to be normal, and a self-diagnosis history indicating the normality determination is stored in the memory 25. Note that the voltage determination threshold may be any value. The voltage determination threshold may be, for example, a specific value higher than the above-mentioned normal voltage range. The voltage determination threshold may be, for example, the same value as the first voltage threshold or the second voltage threshold described above.

If the input battery voltage value indicated by the voltage signal SV is lower than the voltage determination threshold, the control circuit 23 determines that the overvoltage detection circuit 50 does not operate normally. In this case, the self-diagnosis result is determined to be abnormal, and the self-diagnosis history indicating the abnormality determination is stored in the memory 25.

The control circuit 23 controls the overvoltage detection circuit 50 when the input battery voltage value indicated by the voltage signal SV is equal to or higher than the voltage determination threshold (that is, the overvoltage detection circuit 50 is normal) and when the abnormality detection information Sor is at L level. It is determined that it is not working properly. In this case, the self-diagnosis result is determined to be abnormal, and the self-diagnosis history indicating the abnormality determination is stored in the memory 25.

(4) Execution example of self-diagnosis Next, an example of execution of the self-diagnosis function by the control circuit 23 will be described with reference to FIGS. 5 to 7.
First, a first execution example shown in FIG. 5 will be described. The first example of execution shows a case where all self-diagnosis results are normal. Furthermore, in the first execution example, at time t1, the diagnostic item to be executed next is set to the first diagnostic item.

In the first execution example, as shown in FIG. 5, the main power is turned on at time t1. At this time, since the diagnosis timing of the first diagnosis item is the main power off timing, the self-diagnosis of the first diagnosis item is not executed yet.

After the main power is turned on at time t1, the main power is turned off at time t2 without driving the motor 21. Time t2 is the diagnosis timing for the first diagnosis item, but since the motor 21 was not driven during the immediately preceding on period, self-diagnosis for the first diagnosis item is not performed at time t2.

After the main power is turned on again at time t3, the motor 21 is driven normally without being stopped abnormally, and then the main power is turned off at time t4. At time t4, the self-diagnosis of the first diagnosis item is executed based on the timing of the diagnosis of the first diagnosis item that was not executed last time. The first execution example shows an example in which a normal result was obtained in the self-diagnosis started at time t4.

At time t5, the main power is turned on again. At this time, the self-diagnosis of the second diagnostic item is executed based on the fact that the next diagnostic item to be executed is the second diagnostic item, and the diagnostic timing of the second diagnostic item is the main power-on timing. The first execution example shows an example in which a normal result was obtained in the self-diagnosis started at time t5.

Thereafter, the main power is turned off at time t6, and turned on again at time t7. At this time, since the diagnosis timing of the third diagnosis item to be executed next is the main power off timing, the self-diagnosis of the third diagnosis item is not executed yet.

After the main power is turned on at time t7, the motor 21 is driven. However, if an abnormality is detected by the abnormality detection function while the motor 21 is being driven, the motor 21 is stopped. Thereafter, the main power is turned off at time t8. Time t8 is originally the diagnosis timing for the third diagnosis item. However, since the motor 21 was stopped due to detection of an abnormality in the ON period immediately before time t8, the self-diagnosis of the third diagnosis item is not performed at this diagnosis timing. The self-diagnosis of the third diagnosis item is executed at the next diagnosis timing.

Thereafter, the main power is turned on again at time t9. At this time, the next diagnostic item to be executed is the third diagnostic item that was not executed last time, and the diagnostic timing is the main power off timing. Therefore, at time t9, the self-diagnosis of the third diagnosis item is not yet executed.

After the main power is turned on at time t9, the motor 21 is driven normally without being abnormally stopped, and the main power is turned off at time t10. At time t10, the self-diagnosis of the third diagnosis item is executed based on the timing of the diagnosis of the third diagnosis item. The first execution example shows an example in which a normal result was obtained in the self-diagnosis started at time t10.

Thereafter, the main power is turned on again at time t11. At this time, since the diagnosis timing of the fourth diagnosis item to be executed next is the main power off timing, the self-diagnosis of the fourth diagnosis item is not executed yet.

After the main power is turned on at time t11, the motor 21 is driven normally without being abnormally stopped, and the main power is turned off at time t12. At time t12, based on the timing of the diagnosis of the fourth diagnosis item, self-diagnosis of the fourth diagnosis item is executed. The first execution example shows an example in which a normal result was obtained in the self-diagnosis started at time t12.

Thereafter, the main power is turned on again at time t13. At this time, since the diagnosis timing of the fifth diagnosis item to be executed next is the main power off timing, the self-diagnosis of the fifth diagnosis item is not executed yet.

Next, a second execution example shown in FIG. 6 will be described. The second execution example includes a case where a self-diagnosis result of abnormality is obtained. Further, in the second execution example, as in the first execution example, at time t1, the diagnosis item to be executed next is set as the first diagnosis item.

In the second execution example, as shown in FIG. 6, the main power is turned on at time t1, the motor 21 is driven normally without being abnormally stopped, and the main power is turned off at time t2. At time t2, based on the timing of the diagnosis of the first diagnosis item, self-diagnosis of the first diagnosis item is executed. The second execution example shows an example in which an abnormal result was obtained in the self-diagnosis started at time t2.

Thereafter, the main power is turned on again at time t3. At this time, since the diagnosis result of the first diagnosis item in the previous self-diagnosis was abnormal, the next diagnosis item to be executed is still the first diagnosis item. The diagnosis timing of the first diagnosis item is originally the main power off timing. However, based on the fact that the result of the previous self-diagnosis was abnormal, the next diagnosis timing for the first diagnosis item will be the main power-on timing. Therefore, at the main power-on timing at time t3, the self-diagnosis of the first diagnosis item is executed again. The second execution example shows an example in which an abnormal result was obtained even in the self-diagnosis started at time t3. In this case, as illustrated from time t3 to time t4 in FIG. 6, even if the trigger operation unit 20 is turned on, the motor 21 is not driven.

Thereafter, the main power is turned off at time t4, and then turned on again at time t5. In this case, similarly to time t3, based on the fact that the previous self-diagnosis result for the first diagnosis item was abnormal, the self-diagnosis for the first diagnosis item is executed again at the main power supply turn-on timing at time t5. The second execution example shows an example in which an abnormal result was obtained even in the self-diagnosis started at time t5. In this case as well, the motor 21 is not driven even if the trigger operation unit 20 is turned on, as illustrated from time t5 to t6 in FIG.

Thereafter, the main power is turned off at time t6, and then turned on again at time t7. In this case as well, similar to times t3 and t5, based on the fact that the previous self-diagnosis result for the first diagnosis item was abnormal, the self-diagnosis for the first diagnosis item is executed again at the main power-on timing at time t7. Ru. The second execution example shows an example in which a normal result was obtained in the self-diagnosis started at time t7. In this case, as illustrated from time t7 to t8 in FIG. 6, when the trigger operation unit 20 is turned on, the motor 21 is driven.

Thereafter, the main power is turned off at time t8, and then turned on again at time t9. At this time, the self-diagnosis of the second diagnostic item is executed based on the fact that the next diagnostic item to be executed is the second diagnostic item, and the diagnostic timing of the second diagnostic item is the main power-on timing. The second execution example shows an example in which an abnormal result was obtained in the self-diagnosis started at time t9.

Thereafter, the main power is turned off at time t10, and then turned on again at time t11. In this case, since the diagnosis result of the second diagnosis item in the previous self-diagnosis was abnormal, the next diagnosis item to be executed is the second diagnosis item. Further, the diagnosis timing is the main power-on timing based on the fact that the previous diagnosis result was abnormal. Therefore, at the main power-on timing at time t11, the self-diagnosis of the second diagnosis item is executed again. The second execution example shows an example in which an abnormal result was obtained even in the self-diagnosis started at time t11.

Thereafter, the main power is turned off at time t12, and then turned on again at time t13. In this case, similarly to time t11, based on the fact that the previous self-diagnosis result for the second diagnosis item was abnormal, the self-diagnosis for the second diagnosis item is executed again at the main power supply turn-on timing at time t13. The second execution example shows an example in which a normal result was obtained in the self-diagnosis started at time t13.

Next, a third execution example shown in FIG. 7 will be described. The third example includes a case where self-diagnosis is interrupted. Furthermore, in the third execution example, as in the first execution example, at time t1, the diagnosis item to be executed next is set as the first diagnosis item.

In the third example of execution, the period from time t1 to time t7 is the same as that of the first example of execution shown in FIG. 5, and therefore the description thereof will be omitted. After the main power is turned on at time t7, the motor 21 is driven normally without being stopped abnormally, and the main power is turned off at time t8. At time t8, based on the timing of the diagnosis of the third diagnosis item, self-diagnosis of the third diagnosis item is executed. The third execution example shows an example in which the self-diagnosis at time t8 is interrupted before it is normally completed. The control circuit 23 interrupts the self-diagnosis when an interruption condition is satisfied during execution of the self-diagnosis. The suspension conditions may include any conditions. The interruption condition may be satisfied, for example, when the trigger operation unit 20 is turned on.

Thereafter, the main power is turned on again at time t9. At this time, since the self-diagnosis of the third diagnosis item was interrupted in the previous self-diagnosis, the next diagnosis item to be executed is the third diagnosis item. However, unlike the case where the previous self-diagnosis result is abnormal, the diagnosis timing is a prescribed diagnosis timing. Therefore, the self-diagnosis of the third diagnosis item is executed at the main power off timing at time t10 when the main power is turned off. The third execution example shows an example in which a normal result was obtained in the self-diagnosis started at time t10. Note that, as illustrated from time t9 to time t10 in FIG. 7, if the self-diagnosis was interrupted during the previous self-diagnosis, the drive of the motor 21 is not restricted during the next main power-on period, and the trigger operation is disabled. When the section 20 is turned on, the motor 21 is driven. The process from time t11 onwards is the same as the first execution example shown in FIG. 5, so the description will be omitted.

(5) Main Processing Next, the main processing executed by the control circuit 23 will be explained with reference to FIGS. 8 to 14. The CPU 24 of the control circuit 23 uses the main power stored in the memory 25 from when the main power switch 30 is turned on until the self-diagnosis process at S180, which will be described later, is completed immediately after the main power switch 30 is turned off. Execute main processing based on the processing program. Each execution example illustrated in FIGS. 5 to 7 is achieved by the CPU 24 executing the main processing.

After starting the main processing, the CPU 24 determines in S110 whether the time base has elapsed. Time base means control period. The control period may be any time period. In S110, the process waits until the time base has elapsed since the previous transition from S110 to S120. Then, when the time base has elapsed, the process moves to S120.

In S120, switch operation detection processing is executed. Specifically, the operation state of the trigger operation unit 20 by the user of the electric working machine 1 is detected based on the first trigger information ST1 and the second trigger information ST2. Then, trigger detection information ST0 corresponding to the detected operating state is output to the first battery pack 5 and the second battery pack 7.

In S130, battery status processing is executed. Details of the battery status processing are as shown in FIG. That is, when moving to battery status processing, battery communication processing is executed in S210. Specifically, specific data communication is performed with the first battery pack 5 and the second battery pack 7. The battery communication process includes a process of acquiring a first discharge permission signal SA1 output from the first battery pack 5 and a process of acquiring a second discharge permission signal SA2 output from the second battery pack 7. .

In S220, a discharge permission setting process is executed. Specifically, if both the first discharge permission signal SA1 and the second discharge permission signal SA2 are acquired in the battery communication process of S210, one of the third discharge permission signal SA3 and the fourth discharge permission signal SA4 is Output either one. When only the first discharge permission signal SA1 is acquired, the third discharge permission signal SA3 is output. When only the second discharge permission signal SA2 is acquired, the fourth discharge permission signal SA4 is output. As a result, when the third discharge permission signal SA3 is output, the switch section 37 of the first switching circuit 36 is turned on, and battery power can be supplied from the first battery pack 5 to the motor drive circuit 22. When the fourth discharge permission signal SA4 is output, the switch section 47 of the second switching circuit 46 is turned on, and battery power can be supplied from the second battery pack 7 to the motor drive circuit 22. When the discharge permission setting process of S220 is completed, the process moves to S140 (see FIG. 8).

In S140, AD conversion processing is executed. Specifically, various analog signals input to the control circuit 23 are AD converted into digital values that can be processed by the CPU 24.
In S150, abnormality detection processing is executed. Specifically, the above-mentioned abnormality detection function is executed. That is, an overvoltage detection function based on the voltage signal SV input from the overvoltage detection circuit 50, an overcurrent detection function based on the current signal SC input from the current detection circuit 55, and a first temperature input from the first overheat detection circuit 61. A first overheat detection function based on the signal STM1, a second overheat detection function based on the second temperature signal STM2 input from the second overheat detection circuit 62, and a third temperature signal STM3 input from the third overheat detection circuit 63. A third overheat detection function based on the above is executed.

In S160, motor control processing is executed. Details of the motor control process are as shown in FIG. As shown in FIG. 10, when moving to the motor control process, in S310, based on the first trigger information ST1 and second trigger information ST2 input to the control circuit 23, it is determined whether the trigger operation unit 20 is turned on or not. to judge.

If the trigger operation unit 20 is turned off, the process moves to S350. If the trigger operation unit 20 is turned on, the process moves to S320. In S320, it is determined whether an abnormality has been detected in any one of the detection functions in the abnormality detection process of S150. If any abnormality is detected, the process moves to S350. If no abnormality is detected, the process moves to S330. In S320, it is further determined whether the cutoff information SS indicates command permission. If the shutoff information SS indicates command permission, it is determined that no abnormality has occurred in the electric working machine 1, and the process moves to S330. If the shutoff information SS indicates a commanded shutoff, it is determined that an abnormality has occurred in the electric working machine 1, and the process moves to S350.

In S330, it is determined whether the self-diagnosis status, which will be described later, is set to "abnormal". If the self-diagnosis status is set to "abnormal", the process moves to S350. If the self-diagnosis status is not set to "abnormal", the process moves to S340.

In S340, motor drive processing is executed. Specifically, various parameters for controlling the motor drive circuit 22 and driving the motor 21 are calculated. Then, the motor 21 is driven by outputting a motor drive command SD corresponding to the calculated various parameters to the motor drive circuit 22. After the process of S340, the process moves to S170 (see FIG. 8).

In S350, it is determined whether or not it is necessary to apply a brake to the motor 21. Note that moving to S350 means that the motor 21 needs to be stopped. Therefore, the processes from S350 to S370 are processes for appropriately stopping the motor 21.

In S350, it is determined whether or not it is necessary to brake the motor 21, based on a rotation signal indicating the rotation state of the motor 21, which is input from a rotation sensor (not shown), for example. For example, if the motor 21 is rotating at a specified speed or higher and it is necessary to apply a brake to the motor 21, the process moves to S360. In S360, a brake flag is set. As a result, in the brake process that is being executed by the CPU 24 in parallel with the main process, braking is performed in response to the brake flag being set. After processing S360, the process moves to S170.

In S350, if there is no need to apply the brake, for example because the motor 21 has already stopped, the process moves to S370. In S370, the brake flag is cleared. As a result, in the brake processing described above, the brake is stopped in response to the fact that the brake flag is cleared. After processing S370, the process moves to S170. As described above, in the motor control process, if it is determined that there is no abnormality in S320 and the self-diagnosis status is not set to "abnormal" in S330, the process moves to S340 and the motor drive command SD is output. be done. On the other hand, if an abnormality is determined in S320 or if the self-diagnosis status is set to "abnormal" in S330, the motor drive command SD is not output and the motor 21 is not driven.

In S170, display processing is executed. In S170, various information is displayed on the display panel 171.
In S180, a self-diagnosis process is executed. Details of the self-diagnosis process are as shown in FIG. As shown in FIG. 11, when proceeding to the self-diagnosis process, in S410, a self-diagnosis history reading process is executed. Details of the self-diagnosis history reading process are as shown in FIG.

As shown in FIG. 12, when proceeding to the self-diagnosis history reading process, it is determined in S510 whether or not the self-diagnosis history most recently written to the memory 25, that is, the self-diagnosis history of the self-diagnosis items executed last time has been read out. do. Note that the self-diagnosis history is written to the memory 25 in S830 or S850 in the self-diagnosis history writing process shown in FIG. 14, which will be described later.

If the self-diagnosis history has already been read in S510, the process moves to S420 (see FIG. 11). If the self-diagnosis history has not been read yet, the process moves to S520. In S520, the self-diagnosis history written to the memory 25 in the most recent process of S830 or S850 is read from the memory 25.

In S530, it is determined whether the read self-diagnosis history is information indicating normality determination. If the read self-diagnosis history is information indicating normality determination, the process moves to S540. In S540, the diagnostic item for the self-diagnosis to be executed this time is set to the diagnostic item next to the previously executed diagnostic item in the above-mentioned prescribed order. In S550, the self-diagnosis status is set to "not tested". After the process of S550, the process moves to S420 (see FIG. 11). Note that the self-diagnosis status is reset to a prescribed initial value each time the main power is turned off or turned on.

In S530, if the read self-diagnosis history is not information indicating normality determination, the process moves to S560. In S560, it is determined whether the read self-diagnosis history is information indicating abnormality determination. If the read self-diagnosis history is information indicating abnormality determination, the process moves to S570. In S570, the diagnostic items for the self-diagnosis to be executed this time are set to the diagnostic items corresponding to the self-diagnosis history read this time, that is, the same self-diagnostic items as the previous time.

In S580, the self-diagnosis status is set to "abnormal". If the self-diagnosis status is set to "abnormal" here, an affirmative determination is made in S330 (see FIG. 10) and the motor 21 will not be driven while the state continues to be set to "abnormal". .

In S590, a self-diagnosis request flag is set. Note that the self-diagnosis request flag is cleared each time the main power is turned off or turned on. After the process of S590, the process moves to S420 (see FIG. 11).

In S560, if the read self-diagnosis history is not information indicating an abnormality determination, the process moves to S600. In this case, for example, it is possible that the self-diagnosis history was not written normally when the self-diagnosis was executed last time, or that the self-diagnosis history has not yet been written in the first place. Therefore, in S600, the diagnostic item of the self-diagnosis to be executed this time is set as the first (first) diagnostic item in the prescribed order. In S610, the self-diagnosis status is set to "untested". After the process of S610, the process moves to S420 (see FIG. 11).

In S420, a self-diagnosis implementation process is executed. Details of the self-diagnosis implementation process are as shown in FIG. 13. As shown in FIG. 13, when proceeding to the self-diagnosis implementation process, it is determined in S710 whether the self-diagnosis start condition is satisfied.

The self-diagnosis start conditions differ depending on the prescribed diagnosis timing. That is, the self-diagnosis start condition for a diagnostic item whose prescribed diagnostic timing is the main power on timing (in this embodiment, the second diagnostic item, power supply line function diagnosis) is satisfied when the main power on timing arrives. The main processing starts when the main power is turned on, so after starting the main processing, the specified diagnostic timing corresponding to the diagnostic item set as the diagnostic item to be executed this time is the main power on timing. If so, it is determined in S710 that the self-diagnosis start condition is satisfied.

The self-diagnosis start condition for a diagnosis item whose prescribed diagnosis timing is the main power off timing is satisfied when all of the following (i) and (ii) are satisfied.
(i) The timing to turn off the main power has arrived.
(ii) The motor drive command SD has been output even once during the immediately preceding on period (that is, the motor 21 has been driven even once), and the motor 21 has not been abnormally stopped.

Note that (ii) above can be determined based on the motor drive history and abnormal drive history described above.
If the self-diagnosis start condition is not satisfied in S710, the process moves to S730. If the self-diagnosis start condition is satisfied, the process moves to S720. In S720, a self-diagnosis request flag is set.

In S730, it is determined whether the self-diagnosis request flag is set. If the self-diagnosis flag is not set, the process moves to S430 (see FIG. 11). If the self-diagnosis flag is set, the process moves to S740. In S740, self-diagnosis is performed using the diagnostic items set as diagnostic items to be executed this time.

Basically, the self-diagnosis is executed in S740 when the self-diagnosis start condition is satisfied in S710 for the diagnosis item to be executed this time, the self-diagnosis request flag is set in S720, and the self-diagnosis is started. It will not be executed if the conditions are not met. However, if the same diagnostic item is to be self-diagnosed again this time because an abnormality was determined in the previous self-diagnosis, the self-diagnosis request flag is set in S590 of FIG. Therefore, in this case, even if the self-diagnosis start condition is not satisfied, an affirmative determination is made in S730 and the self-diagnosis is executed in S740. After the self-diagnosis in S740 is completed, the process moves to S430 (see FIG. 11).

In S430, a self-diagnosis history writing process is executed. Details of the self-diagnosis history writing process are as shown in FIG. As shown in FIG. 14, when the self-diagnosis history writing process is started, it is determined in S810 whether or not the self-diagnosis for the current diagnosis item has been completed. If the self-diagnosis is interrupted for some reason, the self-diagnosis history writing process is ended and the process moves to S110 (see FIG. 8).

When the self-diagnosis for the current diagnosis item is completed, the process moves to S820. In S820, it is determined whether the diagnosis result is normal. If the diagnosis result is normal, the self-diagnosis history is written to the memory 25 in S830. Specifically, information indicating normality determination is written. In S830, the self-diagnosis status is further set to "inspected", for example. As a result, if the main power is not yet turned off at this point, a negative determination is made in the process of S330, and the motor 21 is thereby driven. After the process of S830, the process moves to S110 (see FIG. 8).

If the diagnosis result is not normal in S820, it is determined in S840 whether the diagnosis result is abnormal. If the diagnosis result is not abnormal, the process moves to S110 (see FIG. 8) without writing the self-diagnosis history, since there is a possibility that the diagnosis result was not correctly obtained due to some factor.

If the diagnosis result is abnormal, the self-diagnosis history is written to the memory 25 in S850. Specifically, information indicating abnormality determination is written. In S850, the self-diagnosis status is further set to "abnormal". If the self-diagnosis status is set to "abnormal" here, an affirmative determination is made in S330 (see FIG. 10) and the motor 21 will not be driven while the state continues to be set to "abnormal". . After the process of S850, the process moves to S110 (see FIG. 8).

(6) Trigger detection function diagnosis process The trigger detection function diagnosis process executed by the CPU 24 in the trigger detection function diagnosis of the first diagnosis item will be explained with reference to FIG. If the set self-diagnosis item is trigger detection function diagnosis in S740 of FIG. 13, the CPU 24 executes the trigger detection function diagnosis process shown in FIG. 15.

When the CPU 24 starts the trigger detection function diagnosis process, it outputs the first pseudo signal SF1 (an H level binary signal) in S1210. In S1220, it is determined whether the first trigger information ST1 indicates an on-operation of the trigger operation section 20. If the first trigger information ST1 does not indicate an on-operation of the trigger operation unit 20, in S1260, it is determined that the diagnosis result is abnormal, the self-diagnosis status is set to "abnormal", and the trigger detection function is diagnosed. Finish the process. If the first trigger information ST1 indicates an on-operation of the trigger operation unit 20, the process moves to S1230.

In S1230, it is determined whether the second trigger information ST2 indicates an off operation of the trigger operation unit 20. If the second trigger information ST2 does not indicate that the trigger operation section 20 has been turned off, there is a possibility that an abnormality has occurred in the trigger detection circuit 80, but it is also possible that the user has turned on the trigger operation section 20. There is also gender. Therefore, if the second trigger information ST2 does not indicate an off operation of the trigger operation section 20, the trigger detection function diagnosis of the first diagnosis item currently being executed is interrupted in S1270.

In S1230, if the second trigger information ST2 indicates an off operation of the trigger operation section 20, the process moves to S1240. In S1240, it is determined whether the shutdown information SS indicates commanded shutdown. If the shutdown information SS does not indicate command shutdown, that is, if it indicates command permission, the process moves to S1260, where it is determined that the diagnosis result is abnormal, and the self-diagnosis status is set to "abnormal". When the shutoff information SS indicates commanded shutoff, the process moves to S1250, determines that the diagnosis result is normal, sets the self-diagnosis status to "normal", and ends the trigger detection function diagnosis process.

(7) Regarding periodic checks of the trigger detection function The control circuit 23 of this embodiment executes the above-mentioned main processing, and in parallel, performs the trigger-off detection check process shown in FIG. 16 and the trigger-on detection check process shown in FIG. 17. Execute.

The trigger off detection check process is a process for checking whether it is possible to properly recognize that the trigger operation unit 20 is turned off based on the first trigger information ST1 and the second trigger information ST2.

The trigger-on detection check process is a process for checking whether it is possible to properly recognize that the trigger operation section 20 is turned on based on the first trigger information ST1 and the second trigger information ST2.

Note that the trigger-off detection check process may be included in the above-mentioned main process. For example, in the main process of FIG. 8, a trigger-off detection check may be performed first after the start of the main process, and then the process may proceed to S110.

The trigger-on detection check process may also be included in the above main process. For example, the trigger-on detection check may be performed before the process of S330 in the motor control process of FIG. 10.

(7-1) Trigger-off detection check process The control circuit 23 executes the trigger-off detection check process shown in FIG. 16, for example, every time the main power is turned on, immediately after the main power is turned on. When the control circuit 23 starts the trigger-off detection check process, it stops outputting the first pseudo signal SF1 in S1010. Note that immediately after the main power source is turned on, the first pseudo signal SF1 is basically not output. Therefore, the process of S1010 is essentially a process of maintaining the state in which the first pseudo signal SF1 is not output.

In S1020, it is determined whether the first trigger information ST1 indicates an off operation of the trigger operation section 20. If the first trigger information ST1 does not indicate an off operation of the trigger operation section 20, it indicates an off operation because the main power switch 30 may have been turned on while the trigger operation section 20 was operated on. The process of S1020 is repeated until the result is as follows.

In S1020, if the first trigger information ST1 indicates an off operation of the trigger operation section 20, the process moves to S1030. In S1030, it is determined whether the second trigger information ST2 indicates an off operation of the trigger operation unit 20. If the second trigger information ST2 does not indicate an off operation of the trigger operation section 20, the process moves to S1020. When the second trigger information ST2 indicates an off operation of the trigger operation section 20, the process moves to S1040.

The processing from S1040 to S1060 is the same as the processing from S1240 to S1260 in FIG. 15 described above. That is, if the shutdown information SS does not indicate commanded shutdown, the self-diagnosis status is set to "abnormal" in S1060, and if the shutdown information SS indicates commanded shutdown, the self-diagnosis status is set to "normal" in S1050. Set to .

(7-2) Trigger-on detection check process The control circuit 23 performs the trigger-on detection check process shown in FIG. 17, for example, by recognizing the on-operation of the trigger operation unit 20 based on the first trigger information ST1 and the second trigger information ST2. Execute when.

After starting the trigger-on detection check process, the control circuit 23 stops outputting the first pseudo signal SF1 in S1110, similarly to S1010 in FIG. 16. In S1120, it is determined whether the first trigger information ST1 indicates an on operation of the trigger operation section 20. If the first trigger information ST1 does not indicate an on operation of the trigger operation unit 20, the process of S1120 is repeated until it indicates an on operation.

In S1120 , if the first trigger information ST1 indicates an on operation of the trigger operation section 20, the process moves to S1130. In S1130, it is determined whether the second trigger information ST2 indicates an on operation of the trigger operation section 20. If the second trigger information ST2 does not indicate an on-operation of the trigger operation unit 20, the process moves to S1120. If the second trigger information ST2 indicates an on-operation of the trigger operation section 20, the process moves to S1140.

In S1140, it is determined whether the cutoff information SS indicates command permission. If the shutdown information SS does not indicate command permission, that is, if it indicates command shutdown, the process moves to S1160 and the self-diagnosis status is set to "abnormal." If the shutoff information SS indicates command permission, the process moves to S1150 and the self-diagnosis status is set to "normal".

(8) Effects of Embodiment According to the embodiment described above, the following effects (a) to (h) are achieved.
(a) In the electric working machine 1 of the present embodiment, each physical quantity of the input battery voltage value, motor current value, U-phase temperature, V-phase temperature, and W-phase temperature corresponds to the software processing by the control circuit 23, respectively. It is monitored both by hardware processing by circuits that perform

That is, for example, regarding the motor current value, software processing by the control circuit 23 determines whether or not an overcurrent state has occurred based on the second current threshold value, and hardware processing by the current detection circuit 55 determines whether or not an overcurrent state has occurred. It is determined whether an overcurrent condition is occurring based on the first current threshold.

If each physical quantity is found to be within an appropriate range by both software processing and hardware processing, a motor drive command SD is input to the drive circuit 22, and the motor 21 is driven. Therefore, it becomes possible to improve the reliability of the electric working machine 1.

(b) Stopping the motor 21 by hardware processing is specifically achieved by turning off the cutoff switch 29 and cutting off transmission of the motor drive command SD to the motor drive circuit 22. Therefore, it becomes possible to easily stop the motor 21 by hardware processing.

(c) The cutoff information SS output from the cutoff latch circuit 70 is input to the control circuit 23 in addition to being input to the cutoff switch 29. Therefore, the control circuit 23 can effectively utilize the shutoff information SS in the main processing.

(d) Specifically, even if no abnormality is detected in the abnormality detection function provided in the control circuit 23, if the shutdown information SS indicates command shutdown, the control circuit 23 outputs the motor drive command SD. do not. This makes it possible to further improve the reliability of the electric working machine 1.

(e) In the electric working machine 1 of this embodiment, the control circuit 23 individually outputs the second pseudo signal SF2, the third pseudo signal SF31, the fourth pseudo signal SF32, and the fifth pseudo signal SF33, so that It is possible to diagnose whether the overvoltage detection circuit 50, the first overheat detection circuit 61, the second overheat detection circuit 62, and the third overheat detection circuit 63 each operate properly. Therefore, it becomes possible to further improve the reliability of the electric working machine 1.

(f) Regarding the threshold values used in each of software processing and hardware processing for the same physical quantity, the threshold value used in hardware processing may be set lower than the threshold value used in software processing. By doing so, the motor drive command SD can be stopped by the software processing before an abnormality is detected by the hardware processing and the cutoff switch 29 is turned off.

(g) If the cutoff latch circuit 70 outputs cutoff information SS indicating command cutoff due to the occurrence of any abnormal condition after the trigger operation unit 20 is turned on, Even if the command is released, the output of the cutoff information SS indicating the command cutoff continues until the trigger operation section 20 is turned off.

In other words, when the motor 21 is stopped due to the occurrence of an abnormal condition, in order to drive the motor 21 again, the user must operate the trigger operation section 20 (specifically, turn it off once, then restart it). (on operation) is required. Therefore, the motor 21 that has once stopped due to the occurrence of an abnormal condition is prevented from being suddenly driven thereafter, making it possible to provide the electric working machine 1 that is easy to use for the user.

(h) In this embodiment, in each of a plurality of functions achieved by at least one of the circuits to be diagnosed in the first to sixth diagnosis items, a method for suppressing malfunction of the function is provided. A dual system has been constructed.

For example, in a motor drive function that drives the motor 21 in response to the trigger operation section 20 being turned on, a dual system is constructed to prevent the motor 21 from rotating unintentionally.

Specifically, the motor 21 is normally driven or stopped when both the first motor drive system and the second motor drive system are normal. The first motor drive system is a system that extends from the trigger switch section 26 via the trigger detection circuit 80 and the control circuit 23 to the drive line 90, that is, the control circuit 23 operates the motor in response to the trigger operation section 20 being turned on. This is a system that outputs a drive command SD. The second motor drive system is a system leading from the trigger switch section 26 to the cutoff switch 29 via the trigger detection circuit 80 and the cutoff latch circuit 70, that is, the cutoff latch circuit 70 is a system that outputs cutoff information SS indicating command permission to the cutoff switch 29.

In the first motor drive system, even if an abnormality occurs such as the motor drive command SD being erroneously output from the control circuit 23 even though the trigger operation unit 20 is not turned on, the second motor drive system If the drive system is normal, the motor 21 is not driven because the cutoff switch 29 is turned off if the trigger operation section 20 is not turned on. Conversely, even if an abnormality occurs in the second motor drive system, for example, the cutoff switch 29 is turned on even though the trigger operation section 20 is not turned on, the first motor drive system If it is normal, if the trigger operation unit 20 is not turned on, the motor drive command SD is not output from the control circuit 23, so the motor 21 is not driven.

For example, in the function of conducting or cutting off the first power supply line 91 by the first switching circuit 36, a double system is constructed to prevent the switch section 37 of the first switching circuit 36 from being turned on by mistake. has been done.

Specifically, the switch unit 37 of the first switching circuit 36 is normally turned on when both the first on-permission system and the second on-permission system are normal. The first ON permission system is for the control circuit 23 to turn on the switch section 37 in response to the control circuit 23 receiving the first discharge permission signal SA1 from the battery abnormality detection circuit 12 of the first battery pack 5. This system outputs the third discharge permission signal SA3. In more detail, the control circuit 23 outputs the third discharge permission signal SA3 in response to input of the second off detection signal SB2 in addition to the first discharge permission signal SA1. The second ON permission system is a system in which the first discharge permission signal SA1 from the battery abnormality detection circuit 12 of the first battery pack 5 is directly input to the first switching circuit 36 without going through the control circuit 23.

In the first ON permission system, for example, the third discharge permission signal SA3 is output from the control circuit 23 even though the first discharge permission signal SA1 is not input from the battery abnormality detection circuit 12 of the first battery pack 5. Even if such an abnormality occurs, if the second ON permission system is normal, the L level signal is input from the battery abnormality detection circuit 12 to the AND circuit 38, so that the switch unit 37 is not turned on. As a result, the supply of power from the battery 11 to the motor 21 is cut off, and the motor 21 is not driven by the power of the battery 11.

Conversely, in the second ON permission system, for example, even though the first discharge permission signal SA1 is not input from the battery abnormality detection circuit 12, the input terminal of the first discharge permission signal SA1 in the AND circuit 38 is at H level. Even if such an abnormality occurs, if the first on-permission system is normal, the control circuit 23 will not output the third discharge permission signal SA3, so the switch section 37 will not be turned on.

Note that also in the function of conducting or cutting off the second power supply line 92 by the second switching circuit 46, a double system is constructed to prevent the switch section 47 of the second switching circuit 46 from being turned on by mistake. ing. For example, suppose that an abnormality occurs such that the fourth discharge permission signal SA4 is output from the control circuit 23 even though the second discharge permission signal SA2 is not input from the battery abnormality detection circuit 17 of the second battery pack 7. However, since the L level signal is input from the battery abnormality detection circuit 17 to the AND circuit 48, the switch section 47 is not turned on. As a result, the supply of power from the battery 16 to the motor 21 is cut off, and the motor 21 is not driven by the power of the battery 16.

In the function of conducting or cutting off the first power supply line 91 by the first switching circuit 36, another dual system is also constructed to prevent the switch section 37 of the first switching circuit 36 from being turned on by mistake. has been done.

Specifically, the switch unit 37 of the first switching circuit 36 is normally turned on when both the third on-permission system and the fourth on-permission system are normal. In the third on-permission system, in response to the control circuit 23 receiving the second off-detection signal SB2 from the second off-detection circuit 49, the control circuit 23 provides a third discharge permission in order to turn on the switch section 37. This is a system that outputs signal SA3. In addition, in more detail, the control circuit 23 outputs the third discharge permission signal SA3 in response to the input of the first discharge permission signal SA1 in addition to the second off detection signal SB2. The fourth ON permission system is a system in which the second OFF detection signal SB2 from the second OFF detection circuit 49 is directly input to the first switching circuit 36 without going through the control circuit 23.

In the third ON permission system, for example, an abnormality may occur such that the third discharge permission signal SA3 is output from the control circuit 23 even though the second OFF detection signal SB2 is not output from the second OFF detection circuit 49. Even if this happens, if the fourth on-permission system is normal, the switch unit 37 will not be turned on. Conversely, in the fourth ON permission system, for example, even though the second OFF detection circuit 49 does not output the second OFF detection signal SB2, the input terminal of the second OFF detection signal SB2 in the AND circuit 38 is high. Even if an abnormality occurs that causes the discharging level to decrease, if the third on-permission system is normal, the control circuit 23 will not output the third discharge permission signal SA3, so the switch section 37 will not be turned on.

For example, in the overvoltage protection function by the overvoltage detection circuit 50, in order to properly stop the motor 21 when an overvoltage state occurs, the cutoff latch circuit 70 turns off the cutoff switch 29 in response to the overvoltage signal So1. A second overvoltage protection system is constructed in which the control circuit 23 stops the motor drive command SD in response to the control circuit 23 detecting the occurrence of an overvoltage state based on the voltage signal SV. .

For example, in the overcurrent protection function by the current detection circuit 55, the cutoff latch circuit 70 turns off the cutoff switch 29 in response to the overcurrent signal So2 in order to properly stop the motor 21 when an overcurrent state occurs. and a second overcurrent protection system in which the control circuit 23 stops the motor drive command SD in response to the control circuit 23 detecting the occurrence of an overcurrent state based on the current signal SC. is being constructed.

For example, in the first overheat protection function by the first overheat detection circuit 61, the cutoff latch circuit 70 is activated in response to the first overheat signal So31 in order to properly stop the motor 21 when a U-phase overheat state occurs. The first overheat protection system turns off the cutoff switch 29, and the control circuit 23 stops the motor drive command SD when the control circuit 23 detects the occurrence of the U-phase overheat state based on the first temperature signal STM1. A second overheat protection system is constructed.

Similarly to the first overheat protection function, two protection systems are constructed in the second overheat protection function by the second overheat detection circuit 62 and the third overheat protection function by the third overheat detection circuit 63.

Note that in this embodiment, the input battery voltage value, motor current value, U-phase temperature, V-phase temperature, and W-phase temperature all correspond to an example of state information (especially physical quantity) in the present disclosure. The signal input from the battery abnormality detection circuit 12 to the AND circuit 38 corresponds to an example of status information (particularly battery information and first battery information) in the present disclosure. The signal input from the battery abnormality detection circuit 17 to the AND circuit 48 corresponds to an example of status information (particularly battery information and second battery information) in the present disclosure. The voltage signal SV, current signal SC, first temperature signal STM1, second temperature signal STM2, and third temperature signal STM3 all correspond to an example of detection information in the present disclosure. The overvoltage detection circuit 50, the current detection circuit 55, the first overheat detection circuit 61, the second overheat detection circuit 62, and the third overheat detection circuit 63 all correspond to an example of an information output circuit (especially a detection circuit) in the present disclosure. do. The battery 11 corresponds to an example of a first battery in the present disclosure. The battery 16 corresponds to an example of a second battery in the present disclosure. The battery abnormality detection circuit 12 corresponds to an example of an information output circuit (particularly a battery information output circuit and a first output circuit) in the present disclosure. The battery abnormality detection circuit 17 corresponds to an example of an information output circuit (particularly a battery information output circuit and a second output circuit) in the present disclosure. The housing 166 corresponds to an example of a mounting portion in the present disclosure. The overvoltage detection circuit 50, the current detection circuit 55, the first overheat detection circuit 61, the second overheat detection circuit 62, the third overheat detection circuit 63, the cutoff latch circuit 70, and the cutoff switch 29 are the drive stop circuit (especially This corresponds to an example of the first stop circuit). Both the first switching circuit 36 and the second switching circuit 46 correspond to an example of a drive stop circuit (especially a second stop circuit) in the present disclosure. The range below the second voltage threshold, the range below the second current threshold, the range below the 2nd U-phase temperature threshold, the range below the 2nd V-phase temperature threshold, and the range below the 2nd W-phase temperature threshold are all defined in the present disclosure. This corresponds to an example of the first tolerance range. The range below the first voltage threshold, the range below the first current threshold, the range below the first U-phase temperature threshold, the range below the first V-phase temperature threshold, and the range below the first W-phase temperature threshold are all defined in the present disclosure. This corresponds to an example of the second tolerance range. The motor drive command SD corresponds to an example of a drive command in the present disclosure. The motor drive circuit 22 corresponds to an example of a drive circuit in the present disclosure. The shutdown information SS indicating the command shutdown corresponds to an example of a stop signal in the present disclosure. The second pseudo signal SF2, the third pseudo signal SF31, the fourth pseudo signal SF32, and the fifth pseudo signal SF33 all correspond to an example of the pseudo abnormality occurrence signal in the present disclosure. The trigger operation unit 20 corresponds to an example of an operation unit in the present disclosure.

The process in S740 corresponds to an example of the output process in the present disclosure. The processes of S830 and S850 both correspond to an example of storage processing in the present disclosure.
[Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented with various modifications.

(1) The cutoff switch 29 may be any switch. The cutoff switch 29 may be configured by a circuit including a plurality of elements instead of a single switch.
(2) Any one or more of the overvoltage signal So1, the overcurrent signal So2, the first overheating signal So31, the second overheating signal So32, and the third overheating signal So33 may be input to the cutoff latch circuit 70.

(3) The latch function may be omitted from the cutoff latch circuit 70. Specifically, for example, the output signal of the NOT circuit 73 may be input to the cutoff switch 29.
(4) The trigger determination information STR may not be input to the cutoff latch circuit 70. That is, the cutoff switch 29 is turned off when any one of the overvoltage signal So1, the overcurrent signal So2, the first overheating signal So31, the second overheating signal So32, and the third overheating signal So33 is output. If no signals are output, they may be turned on regardless of the operating state of the trigger operating section 20.

(5) It is one example to determine whether or not an abnormality has occurred based on one threshold value. For example, you can set a tolerance range that can be determined as normal, and if the detected physical quantity is within the tolerance range, it is determined to be normal, and if the detected physical quantity is not within the tolerance range, it is determined to be abnormal. You may judge.

For example, regarding the U-phase temperature, the control circuit 23 determines that the U-phase temperature is normal if the U-phase temperature is within a first allowable range (for example, a range from the first lower limit temperature to the first upper limit temperature). If it is determined that there is, and the U-phase temperature is not included in the first tolerance range, it may be determined that the U-phase temperature is abnormal.

In this case, the first overheating detection circuit 61 outputs the first overheating signal So31 if the U-phase temperature is included in the second allowable range (for example, the range from the second lower limit temperature to the second upper limit temperature). Instead, the first overheating signal So31 may be output when the U-phase temperature is not included in the second tolerance range.

Further, in this case, the second allowable temperature may completely include the first allowable temperature and may be wider than the first allowable temperature. Alternatively, while the second upper limit temperature is higher than the first upper limit temperature, the second lower limit temperature may be the same as the first lower limit temperature or higher than the first lower limit temperature. For example, while the second lower limit temperature is lower than the first lower limit temperature, the second upper limit temperature may be the same as the first upper limit temperature or lower than the first upper limit temperature.

(6) The overvoltage detection circuit 50, the current detection circuit 55, the overheat detection section 60, the cutoff latch circuit 70, and the trigger detection circuit 80 may have different circuit configurations from those shown in FIGS. 2 and 3.
(7) Any four or less of the overvoltage detection circuit 50, the current detection circuit 55, the first overheat detection circuit 61, the second overheat detection circuit 62, and the third overheat detection circuit 63 may be omitted. For example, if only the current detection circuit 55 is provided among these five detection circuits, the OR circuit 72 may be omitted from the cutoff latch circuit 70 and the overcurrent signal So2 may be input to the NOT circuit 73. good. In this case, if the latch function is not required, the overcurrent signal So2 may be input to the NOT circuit 73, and the output signal of the NOT circuit 73 may be input to the cutoff switch 29.

(8) A detection circuit that detects a physical quantity different from the input battery voltage value, motor current value, and each phase temperature may be provided. The detection circuit also has a function of detecting a physical quantity and a function of detecting an abnormality based on the physical quantity, as well as the above-mentioned detection circuits, and is configured so that the control circuit 23 can perform self-diagnosis. Good too.

(9) The electric working machine 1 may be provided with a self-diagnosis function of the current detection circuit 55. Specifically, the control circuit 23 may have a function of outputting a sixth pseudo signal to the current detection circuit 55 to pseudo-generate an overcurrent state. The current detection circuit 55 may be configured such that, upon receiving the sixth pseudo signal, the current signal SC becomes a signal indicating an overcurrent state. With such a configuration, the control circuit 23 can diagnose whether the current detection circuit 55 operates normally based on the current signal SC when the sixth pseudo signal is output.

(10) The electric working machine 1 of the above embodiment is configured such that the shutoff information SS and the abnormality detection information Sor are individually input to the control circuit 23, but as shown in FIG. It may be configured such that the logical sum of the error detection information Sor and the abnormality detection information Sor is input to the control circuit 23. Specifically, as shown in FIG. 18, the electric working machine 1 includes an OR circuit 95, and the shutoff information SS and the abnormality detection information Sor may be input to the OR circuit 95. Then, the output signal of the OR circuit 95 may be input to the control circuit 23.

( 11) The prescribed order may be any order. A weight may be set for each diagnostic item. In that case, the prescribed order may be determined according to the weight. More specifically, the prescribed order may be determined such that the higher the weight of the diagnostic item, the higher the execution frequency.

At least one of the six types of diagnostic items may be arranged consecutively in the prescribed order. Further, a plurality of diagnostic items may be associated in the same order. In other words, diagnosis of a plurality of diagnosis items may be performed sequentially or in parallel at one diagnosis timing.

The order in which self-diagnosis is executed is not limited to the prescribed order, and may be in any order. For example, the execution order may be determined randomly. Specifically, for example, the electric working machine 1 may include a random number generator, and determine the next self-diagnosis item to be executed based on the random numbers generated by the random number generator.

(12) The present disclosure is also applicable to an electric working machine configured to connect each battery in two battery packs in series and supply electric power from each battery to the motor side. A specific example is shown in FIG.

In the electric working machine 200 shown in FIG. 19, the main body 201 is different from the main body 3 shown in FIG. 2 in the following points. The main body portion 201 shown in FIG. 19 includes series connection wiring 202. The main body portion 201 shown in FIG. The series connection wiring 202 connects in series the battery 11 of the first battery pack 5 attached to the housing 166 and the second battery 16 of the second battery pack 7 attached to the housing 166. More specifically, the series connection wiring 202 connects the positive electrode of the battery 16 and the negative electrode of the battery 11. As a result, a voltage obtained by adding the voltage of the battery 11 and the voltage of the battery 16 is input to the main body section 201 .

Accordingly, the main body section 201 is not provided with the second charge suppression circuit 41, the second switching circuit 46, the second off detection circuit 49, and the second power supply line 92 in the main body section 3 shown in FIG. .

Further, when the trigger operation unit 20 is turned on, the control circuit 203 outputs the third discharge permission signal SA3 if both the first discharge permission signal SA1 and the second discharge permission signal SA2 are input. If both the first discharge permission signal SA1 and the second discharge permission signal SA2 are not input, the control circuit 203 does not output the third discharge permission signal SA3.

Furthermore, in the power supply line function diagnosis, the control circuit 203 diagnoses whether the first switching circuit 36 operates normally.
In the AND circuit 38, the signal from the battery abnormality detection circuit 17 is input to the input terminal configured to receive the signal from the second OFF detection circuit 49 in the main body 3 shown in FIG. is input.

In the electric working machine 200 configured as described above, when the first discharge permission signal SA1, the second discharge permission signal SA2, and the third discharge permission signal SA3 are input to the AND circuit 38, the switch section 37 is turned on. do. Even if the third discharge permission signal SA3 is input from the control circuit 23 to the AND circuit 38, if the first discharge permission signal SA1 and/or the second discharge permission signal SA2 is not input to the AND circuit 38 (i.e., if the battery 11 and/or when the battery 16 is abnormal), the switch unit 37 is cut off, and the supply of power from the battery 11 and the battery 16 to the motor 21 is cut off.

(13) The present disclosure is also applicable to an electric working machine that includes one battery pack and is configured to operate by receiving power from the one battery pack. Specifically, for example, the second battery pack 7 and the series connection wiring 202 are omitted from the electric working machine 200 shown in FIG. It may be configured such that SA1 and the third discharge permission signal SA3 are input.

(14) The motor of the present disclosure may be a motor different from a brushless motor. Further, the electric working machine of the present disclosure is not limited to an electric working machine driven by battery power, but may be an electric working machine to which AC power is input and driven by the AC power.

(15) The technology of the present disclosure can be applied to various electric working machines other than brush cutters, such as electric working machines for gardening, power tools for masonry, metalworking, and woodworking. More specifically, the present disclosure applies to, for example, an electric hammer, an electric hammer drill, an electric drill, an electric screwdriver, an electric wrench, an electric grinder, an electric circular saw, an electric reciprocating saw, an electric jigsaw, an electric cutter, an electric chain saw, an electric planer, an electric nailer, etc. Applicable to various electric working machines such as machine (including nail driver), electric hedge trimmer, electric lawn mower, electric lawn clipper, electric brush cutter, electric cleaner, electric blower, electric sprayer, electric spreader, electric dust collector, etc. Can be done.

(15) A plurality of functions of one component in the above embodiment may be realized by a plurality of components, and a function of one component may be realized by a plurality of components. . Further, a plurality of functions possessed by a plurality of constituent elements may be realized by one constituent element, or one function realized by a plurality of constituent elements may be realized by one constituent element. Further, a part of the configuration of the above embodiment may be omitted. Further, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of other embodiments.

DESCRIPTION OF SYMBOLS 1,200... Electric work machine, 3,201... Main body part, 5... First battery pack, 7... Second battery pack, 11, 16... Battery, 12, 17... Battery abnormality detection circuit, 20... Trigger operation part, 21... Motor, 22... Motor drive circuit, 23, 203... Control circuit, 24... CPU, 25... Memory, 26... Trigger switch section, 27... First trigger switch, 28... Second trigger switch, 29... Cutoff switch, 30... Main power switch, 36... First switching circuit, 37, 47... Switch section , 5 0... Overvoltage detection circuit, 60... Overheating detection section, 61... First overheating detection circuit, 62... Second overheating detection circuit, 63 ...Third overheat detection circuit, 70... Cutoff latch circuit, 80... Trigger detection circuit, 202... Series connection wiring.

Claims (6)

An electric working machine,
motor and
an information output circuit configured to output status information indicating a status of the electric working machine;
A control circuit configured to execute a motor control process by software processing based on a specific program, wherein the motor control process is such that the state information output from the information output circuit can drive the motor. a control circuit including processing for permitting the motor to be driven in response to the indication that the motor is being driven;
A drive stop circuit configured to operate by hardware processing without using software processing, wherein the status information output from the information output circuit indicates that the motor should be stopped. a drive stop circuit configured to stop the motor regardless of the execution state of the motor control process;
Equipped with
The state information includes a physical quantity indicating a state of the electric working machine,
The information output circuit includes a detection circuit configured to detect the physical quantity and output detection information indicating the detected physical quantity,
The motor control process includes a process of outputting a drive command for driving the motor in response to the physical quantity indicated by the detection information output from the detection circuit being included in a first tolerance range. including,
The drive stop circuit stops the drive even if the drive command is output from the control circuit in response to the fact that the physical quantity indicated by the detection information output from the detection circuit is not included in a second tolerance range. a first stop circuit configured to stop the motor;
The first stop circuit is configured to output a stop signal in response to the fact that the physical quantity indicated by the detection information output from the detection circuit is not included in the second tolerance range,
The electric working machine further includes:
A drive circuit configured to receive the drive command from the control circuit, and configured to supply power to the motor to drive the motor in response to the input of the drive command. a drive circuit,
a drive line configured to transmit the drive command from the control circuit to the drive circuit;
Equipped with
The first stop circuit includes a cutoff switch;
The cutoff switch is
provided on the drive line,
configured to conduct or cut off the drive line,
The stop signal is configured to be input,
When the stop signal is input, the drive line is cut off to cut off the input of the drive command to the drive circuit to stop the motor;
It is configured as follows.
Electric work equipment. The electric working machine according to claim 1 ,
The electric working machine, wherein the second tolerance range includes the first tolerance range and is wider than the first tolerance range. The electric working machine according to claim 1 or 2 ,
Further, an operation unit configured to allow a user of the electric working machine to perform an on operation or an off operation,
In the motor control process, the control circuit outputs the drive command when the ON operation is performed on the operation section, and outputs the drive command when the OFF operation is performed on the operation section. is configured to stop and
When the motor is stopped after the on-operation is performed in the operation section, the first stop circuit is configured to stop the motor, and the first stop circuit is configured to stop the motor after the on-operation is performed on the operation unit, and then stop the motor. The electric working machine is configured to stop the motor even if the physical quantity falls within the second tolerance range, at least until the off operation is performed on the operation unit. The electric working machine according to any one of claims 1 to 3 ,
Furthermore, it includes a battery that outputs electric power for driving the motor,
The state information includes battery information indicating the state of the battery,
The information output circuit includes a battery information output circuit configured to output the battery information,
The drive stop circuit is configured to cut off power supply from the battery to the motor in response to the battery information output from the battery information output circuit indicating an abnormality in the battery. including a second stop circuit;
Electric work equipment. An electric working machine,
motor and
an information output circuit configured to output status information indicating a status of the electric working machine;
A control circuit configured to execute a motor control process by software processing based on a specific program, wherein the motor control process is such that the state information output from the information output circuit can drive the motor. a control circuit including processing for permitting the motor to be driven in response to the indication that the motor is being driven;
A drive stop circuit configured to operate by hardware processing without using software processing, wherein the status information output from the information output circuit indicates that the motor should be stopped. a drive stop circuit configured to stop the motor regardless of the execution state of the motor control process;
Equipped with
The state information includes a physical quantity indicating a state of the electric working machine,
The information output circuit includes a detection circuit configured to detect the physical quantity and output detection information indicating the detected physical quantity,
The motor control process includes a process of outputting a drive command for driving the motor in response to the physical quantity indicated by the detection information output from the detection circuit being included in a first tolerance range. including,
The drive stop circuit stops the drive even if the drive command is output from the control circuit in response to the fact that the physical quantity indicated by the detection information output from the detection circuit is not included in a second tolerance range. a first stop circuit configured to stop the motor;
The first stop circuit is configured to output a stop signal in response to the fact that the physical quantity indicated by the detection information output from the detection circuit is not included in the second tolerance range,
The control circuit is configured to receive the stop signal, and is configured not to output the drive command when the stop signal is input,
The control circuit is configured to output a pseudo abnormality occurrence signal,
The detection circuit is configured to output the detection information corresponding to the physical quantity that is not included in the second tolerance range, regardless of the actual physical quantity, in response to the input of the pseudo abnormality occurrence signal. It is configured,
The control circuit includes:
output processing for outputting the pseudo abnormality occurrence signal at a specific diagnostic timing;
a storage process for storing an abnormal state in response to the fact that the stop signal is not input while the pseudo abnormality occurrence signal is being output by the output process;
Run
The control circuit is configured not to output the drive command when the abnormal state is stored. An electric working machine,
motor and
an information output circuit configured to output status information indicating a status of the electric working machine;
A control circuit configured to execute a motor control process by software processing based on a specific program, wherein the motor control process is such that the state information output from the information output circuit can drive the motor. a control circuit including processing for permitting the motor to be driven in response to the indication that the motor is being driven;
A drive stop circuit configured to operate by hardware processing without using software processing, wherein the status information output from the information output circuit indicates that the motor should be stopped. a drive stop circuit configured to stop the motor regardless of the execution state of the motor control process;
Equipped with
The electric working machine further includes:
a first battery pack including a first battery configured to output first power for driving the motor;
a second battery pack including a second battery configured to output second power for driving the motor;
a mounting section configured to allow the first battery pack and the second battery pack to be attached and detached;
a series connection wiring configured to connect in series the first battery in the first battery pack mounted on the mounting section and the second battery in the second battery pack mounted on the mounting section; ,
Equipped with
The state information includes first battery information indicating a state of the first battery and second battery information indicating a state of the second battery,
The information output circuit includes a first output circuit provided in the first battery pack and configured to output the first battery information, and a first output circuit provided in the second battery pack and configured to output the second battery information. a second output circuit configured to
The drive stop circuit is configured to detect that the first battery information output from the first output circuit indicates an abnormality in the first battery and/or that the second battery information output from the second output circuit indicates that the first battery information is abnormal. The motor is configured to cut off the supply of the first power and the second power from the first battery and the second battery to the motor in response to the second battery indicating an abnormality. including a second stop circuit;
Electric work equipment.

Images