JP2013009608A - Electric control device of electric management working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems wherein consumption of the battery power is large because the tilling load or the load variation is large in a form of tilling the soil by rotationally driving a motor with a battery power supply and driving a tilling rotor to tilt the soil, wherein the operation for increasing or decreasing the output according to the load variation is complicated, and wherein it is difficult to retain the working efficiency and excellent workability for a long period of time.SOLUTION: When a voltage value of the residual capacity of the battery 1 for electrically driving the motor 2 is a set value or less, and such state being at the set value or less is continued for a set period of time or more, it is displayed on a residual capacity monitor 48 that the residual capacity of the battery is insufficient.

Description

  The present invention relates to an electric control device for an electric power management work machine that rotates and cultivates a tilling rotor over a long period of time with a battery power source, and displays a shortage of battery remaining on a monitor.

  A technique (for example, see Patent Document 1) is known in which a tilling rotor is rotationally driven by a battery power source.

JP 2009-34000 A

  In the form of rotating the motor with the battery power source and driving the tilling rotor to cultivate the soil, the power consumption of the battery is large due to the large tillage load and load fluctuation, and the output is adjusted and adjusted for the load fluctuation, etc. However, it is difficult to maintain work efficiency and good workability over a long period of time. In addition, it is desirable to continue the work efficiently while paying attention to the remaining amount of the battery and not to damage the battery due to overdischarge. For this reason, the remaining battery level is displayed on the monitor, but since this remaining battery level varies depending on the electric load and the battery charging by the charge control circuit, the shortage of the remaining battery level is always displayed on the monitor. Let the work continue.

  The invention described in claim 1 is an electric power management including a battery 1 of a secondary battery provided with a charge control circuit 27 and a discharge control circuit 28, and a tilling rotor 3 mounted and driven by the electric motor 2 by the battery 1. In the work machine, the remaining voltage value of the battery 1 that drives the motor 2 becomes a state equal to or lower than the set value, and the state lower than the set value continues for a set time or longer, so that The electric control device is configured to display on the remaining amount monitor 48 that the amount is insufficient.

  The motor 1 is electrically driven by the battery 1 as the secondary battery, and the work is carried out while driving the tilling rotor 3 and the like. During this work, the remaining amount of battery is displayed on the remaining amount monitor 48. The operator continues the operation while checking the display of the remaining amount monitor LED 48, and when it is displayed that the remaining amount of the battery is insufficient, the operation is stopped and the battery 1 is charged. Prepare for the resumption of work. The determination of the remaining amount of the remaining amount monitor 48 is set as a value obtained by adding a constant value V1 to the discharge stop voltage, assuming that the voltage VL of the battery 1 is in an area equal to or higher than the discharge stop voltage. Therefore, when the remaining battery voltage is read during operation and the value of the voltage VL is equal to or lower than “discharge stop voltage + V1” for a certain period of time (longer than the motor start time t1), the remaining battery level is low. The monitor LED (lit red) is turned on. Even if there is a sudden voltage drop of the battery at the time of starting the motor, it is possible to prevent the monitor from being lightly charged.

  According to a second aspect of the present invention, in a form in which a shortage of the remaining battery voltage is displayed by a decrease in the remaining voltage value of the battery 1 and a continuation of the lowering time, an elapse of a set time from the start of operation, or a load current Until the value is detected below the set value, the shortage is not displayed.

  As described above, the remaining battery voltage is read during operation, and this remaining battery voltage VL continues for a certain time t1 (longer than the motor start time t) in a state of “discharge stop voltage + V1” or less. The red output of the remaining amount monitor LED 48 is turned ON (the remaining battery level monitor LED red is lit).

According to a third aspect of the present invention, the battery voltage determined as the remaining amount of the battery 1 is not less than the discharge stop voltage, and is a value obtained by adding a constant value (V1) to the discharge stop voltage.
As described above, the battery voltage is displayed on the monitor during the driving operation, and when the remaining battery level is low, the battery voltage is displayed as low and is notified to the driver. At this time, the battery voltage determined to be low is determined based on a voltage reference value that is higher by a V1 value than the discharge stop voltage obtained by adding the constant value V1 to the discharge stop voltage. When a voltage value lower than a reference value obtained by adding the constant value V1 is detected, the remaining amount monitor 48 displays a low remaining amount.

  According to a fourth aspect of the present invention, the monitor display is returned to the display indicating that the remaining amount is sufficient by detecting that the voltage value is equal to or higher than the set value after displaying the battery remaining shortage during the operation of the electric power management work machine.

  When the workload is reduced during the operation or the voltage value is detected to be equal to or higher than the set value due to charging of the battery 1 or the like, the monitor display in the low battery shortage area is automatically displayed. Control is returned to a sufficient display (lighting of the remaining amount monitor LED edge).

The invention according to claim 5 sets that the detection time t2 is shorter than the time t1 for detecting the voltage drop (t2 <t1).
The voltage value of the battery during the electric work is constantly detected, the time t2 when the voltage value is equal to or higher than the set value, the time t1 when detecting the voltage drop, etc. are detected, and the voltage value is set. The detection time t2 that is equal to or greater than the value is set as a time (t2 <t1) shorter than the time t1 for detecting the voltage drop.

  In the first aspect of the invention, the monitor 2 display indicating that the remaining battery level is insufficient is not due to a temporary voltage value drop due to overload or the like, but the remaining voltage value is less than or equal to the set value. Since it is displayed by continuing for more than the set fixed time, it can display appropriately battery remaining shortage, and can improve work efficiency.

  According to the second aspect of the present invention, when the remaining battery state of the battery remaining amount monitor is informed to the driver, when the battery voltage for determining that the remaining amount is low is displayed for a certain period of time, the remaining amount is displayed. "Is set as a value longer than the start-up time of the motor. As a result, when the operation is started and when the motor is started, even if the battery voltage drops due to overload, it is possible to prevent the remaining monitor from being turned on, and it is possible to perform accurate and stable monitor lighting.

  In the third aspect of the invention, as described above, the battery voltage VL to be notified when the remaining amount is low is determined by using a value obtained by adding the constant value V1 to the discharge stop voltage as a voltage equal to or higher than the discharge stop voltage. Therefore, the value that informs the low battery level can be set easily and appropriately, the work in the overdischarge state can be reduced, the battery can be protected and the safe electric work can be performed. .

The invention according to claim 4 can automatically switch the remaining battery level to an appropriate display when the voltage value fluctuates due to temporary continuation of overload work or the like and then recovers. it can.
According to the fifth aspect of the present invention, in the battery remaining amount monitor in the electric work, the time t2 for detecting the voltage value equal to or higher than the set value is set short and the time t1 for detecting the voltage drop is set to be longer than this. Thus, since the remaining amount is displayed, the operator can quickly recognize that the voltage value is not lowered, so that a smooth operation can be performed.

The side view of an electric management work machine. The rear view. The plan view. The block diagram of a motor electric circuit. The block diagram (A) of an electric motor drive control circuit part, and the block diagram (B) of the output control circuit part. The block diagram at the time of charger connection. The block diagram of the monitor unit in the motor drive control. The flowchart (A) of the battery remaining amount monitor control, the top view (B) of the remaining amount monitor, and the time chart (C) showing the threshold value of the monitor output. The flowchart (A) of the battery remaining amount monitor control, and the graph (B) which shows the motor current curve at the time of driving | running start (at the time of start). Charge amount curve graph (A) of the charger and flowcharts (B) and (C) of the charge control. The flowchart (A) of the battery remaining amount monitor control, the top view (B) of the remaining amount monitor, and the time chart (C) showing the threshold value of the monitor output. The flowchart of the battery remaining amount monitor control which shows the other example partially. The flowchart of the battery remaining amount monitor control which shows the other example partially. The flowchart of the battery remaining amount monitor control which shows the other example partially. The flowchart of the battery remaining amount monitor control which shows the other example partially. The flowchart of the battery remaining amount monitor control which shows the other example partially. The block diagram (A) of the monitor control circuit part which shows the example in part, and its flowchart (B), (C).

  Based on the drawings, the electric travel management working machine is composed of a cultivator-type tilling work machine that drives and rotates the tilling rotor 3 having the tilling claws 5 to propel and run the soil surface. A battery 1 and an electric motor 2 that is electrically driven by the battery 1 are mounted on the upper side of the work machine frame 6. A transmission case 7 is provided below the electric motor 2 at the front portion of the frame 6 and includes a motor transmission shaft in the vertical direction. The transmission case 7 is laterally moved by transmission through the motor transmission shaft at the lower portion of the transmission case 7. A rotary shaft 8 is rotatably supported around the shaft core. A tilling claw 5 is disposed around the rotary shaft 8 extending from the central transmission case 7 to the left and right sides, and side discs 9 are attached to both ends to constitute the tilling rotor 3.

  The disk-shaped motor base 10 covering the top of the tilling rotor 3 has a bottom attached to and supported on the work machine frame 6, the electric motor 2 is attached to the upper front part of the motor base 10, and the battery is attached to the rear part. 1 is mounted. The upper side of the motor base 10 is covered with a motor cover 12 so as to be opened and closed. The battery case 11 has a handle at the upper end for easy handling, and a protrusion for preventing the movement of the battery case 11 is fitted into an engagement hole formed in the motor base 10 on the bottom surface. Yes.

  A handle frame 13 is provided at the rear part of the work machine frame 6 toward the obliquely rear upper part, and a pair of operation handles 14 are provided on both the left and right sides of the rear end part. A grip 15 is provided on each operation handle 14. ing. The right-hand handle 14 is provided with an operation lever 17 in the vicinity of the grip 15 for turning the electric motor 2 on and off.

  At the rear end of the work machine frame 6 are attached an auxiliary wheel 18 that supports the machine body by rotating downward when the work machine is moved, and a resistance bar 19 that prevents dashing during tillage work. When the auxiliary wheel 18 is not in use, the auxiliary wheel 18 is rotated backward to be in the stowed posture.

  A key switch 16 for turning on / off the power from the battery 1 is provided in an operation case portion formed at a position where the operation handle 14 is attached to the handle frame 13. Further, on the rear surface of the battery case 11, an output terminal 21 of a motor drive circuit 20 that connects between the battery 1 in the battery case 11 and the electric motor 2, and a charging terminal 22 for charging the battery 1. Are provided.

  The battery case 11 is provided with the output terminal 21 and the charging terminal 22 on the rear outer wall portion, the battery 1 (battery pack 24) including a plurality of battery cells 23 is provided therein, and a charge control circuit is provided on the upper surface of each battery cell 23. 27 is slidable back and forth so that it can be inserted and removed, and on this upper side, the discharge control board 26 incorporating the discharge control circuit 28 and the output control circuit 34 can be slid back and forth. And is detachable. The terminal of the charging control board 25 is connected to the charging terminal 22 by wiring, and is electrically connected directly to each battery cell 23. Further, the discharge control board 26 has a circuit configuration so that a voltage resulting from the series connection of a plurality of battery cells 23 can be output to the output terminal 21.

  A discharge control circuit 28 of the discharge control board 26 is interposed in the middle of the motor drive circuit 20 that connects the battery cell 23 and the electric motor 2, and the discharge control board 26 includes the output control circuit 34, A current detection circuit 29, a switching circuit 30, a current smoothing circuit 31, an overdischarge prevention circuit 32, a short circuit prevention circuit 33, and the like are provided.

  Among these, the output control circuit 34 receives the operation signal from the operation signal control circuit 35 by the key switch 16 and the operation (limit) switch 4 and outputs the switching circuit 30 to ON / OFF switching. The switching output is configured to switch the motor driving circuit 20 so as to be cut off or connected.

  The current detection circuit 29 detects the control current of the discharge control board 26, and when the state exceeding the preset set current value continues for a specified time, the switching circuit 30 is turned off and the motor drive circuit 20 is shut off. It is configured to do.

  Each charge control board 25 incorporates an overcharge prevention circuit 36, while the discharge control board 26 has an output control circuit 34 and the like as described above, a current detection circuit 29, a current smoothing circuit 31, and an overdischarge prevention circuit. 32, a short circuit prevention circuit 33, a switching circuit 30, an output limiting circuit 39, and the like are incorporated. The current smoothing circuit 31 is a circuit for smoothing a surge current generated when the operation signal is input.

  In the form in which the battery charger 40 is connected and the charge completion is determined, when the charger 40 determines that charging is complete or charging, a predetermined LED 37 is turned on, and the charge control board 25 side When the overcharge prevention circuit 36 is activated, charging may be stopped.

  Although the short-circuit prevention for the discharge control board 26 can be prevented by the short-circuit prevention circuit 33, the short-circuit prevention for each charge control circuit 27 is not provided for each of the discharge control boards 26. 33 substrates are provided between the charging terminal 22 and the charge control substrate 27.

  The output terminal 21 of the battery case 11 is connected to the electric motor 2 by the motor drive circuit 20 as the output terminal 21 to the electric motor 2 and is connected to the operation signal control circuit 35 as the terminal 21 for signal input / output. From this signal control circuit 35, an on / off signal can be input to the key switch 16 or the operation (limit) switch 4 operated by the operation lever 17, and an operation signal can be output to the output control circuit 28, or Based on the output from the output control circuit 28, the remaining battery (battery) level, a warning display signal, etc. are input from the signal control circuit 35 to the operation monitor 37, and the power on / off LED 57, the operation warning LED 58, The battery remaining amount monitor LED 48 and the like are output.

  The output terminal 21 is connected to the electric motor 2 via a breaker 38. The breaker 38 is composed of a solenoid-operated switch that turns the motor drive circuit 20 on and off. When the current value of the motor drive circuit 20 increases, the breaker 38 is energized to turn off the switch to turn off the motor drive circuit 20 and turn off the electric motor 2. It is the structure used as a stop position. The breaker 38 is provided on the rear upper surface of the motor base 10 in the form of an ON-OFF switch.

  When the operation lever 17 of the right hand side handle 14 is gripped and rotated against the spring force, the operation switch 4 is turned ON and the electric motor 2 is driven by a signal from the operation signal control circuit 35. . When the grip of the operation lever 17 is released, it is returned by the spring force, the operation switch 4 is turned OFF, and the electric motor 2 is also stopped.

  In tilling work, the state of charge of the battery 1 is confirmed by a remaining amount monitor such as blinking of the battery remaining amount monitor LED 48. If the charging is insufficient, the charger 40 is connected to the charging terminal 22 to perform predetermined charging. When starting the tillage work, when the operation switch 4 is turned on by turning on the key switch 16 and gripping and rotating the operation lever 17, the ON signal of the operation switch 4 is passed through the operation signal control circuit 35. It is transmitted to the output control circuit 34, the switching circuit 30 is operated to the circuit connection side, the electric motor 2 is driven by the battery 1, and the tilling rotor 3 is rotated by the driving of the electric motor 2 to perform the tilling work. .

  When stopping the tilling work, when the operator releases the operating lever 17, it is returned by the spring force, and the driving current from the battery 1 is cut off by the operation signal when the operation switch 4 is turned off. Driving is stopped.

  Here, as shown in FIGS. 7 and 8, as a control device for monitoring and displaying the remaining amount of the battery 1, the operation switch 4, the key switch 16, the breaker stop switch 38, and the temperature sensor 45 are provided on the input side of the controller 44. A battery voltage input 46, a motor current input 47, and the like are arranged. Further, on the output side, a red LED and a green LED are provided as the operation monitor 37, a red LED and a green LED as the battery remaining amount monitor 48 are provided as a part of the monitor unit 43, and the motor is driven. A signal 49 and the like are arranged.

  Battery voltage VL = (discharge stop voltage +) for determining “low battery level” with the battery voltage at which the load current output for protecting the cell 23 of battery 1 is stopped as the “discharge stop voltage”. Constant value V1). Also, in the graph (C) showing the threshold value for switching on the remaining battery level monitor, when the battery voltage changes to the voltage VL position where the remaining capacity is low and the voltage VH position where work operation is possible, this voltage is When the voltage drops to VL, the remaining amount monitor 48 is switched from lighting the green LED to lighting the red LED. Conversely, when the voltage rises from VL to VH, the red LED is switched on. A chattering phenomenon is prevented by setting an appropriate voltage difference between the low and high voltages VL and VH.

  When the operation switch 4 is turned on, an operation signal 35 is generated and supplied to the discharge control circuit 28, and current is supplied from the battery 1 to rotate the motor 2. During this operation, the battery voltage is read (step S1), and when the battery voltage is VL or less (S2) determined to be low, the remaining amount monitor 48 red LED is turned on (S3). On the other hand, when it is equal to or higher than VL, the remaining amount monitor 48 turns on the green LED (S5). Even if the voltage is equal to or lower than VL, if the voltage VH is detected after that (S7), the remaining amount monitor 48 is switched to the green LED and is lit (S9).

  However, in FIG. 9, the motor current curve i at the start of operation is shown. In this graph, the current decrease fluctuation at the start time t1 at the start of operation is severe. It is not preferable to use the reference value. Here, in the electric management work machine having the battery 1 of the secondary battery provided with the charge control circuit 27 and the discharge control circuit 28 and the tilling rotor 3 that is driven by mounting the electric motor 2 by the battery 1, this motor 2, the remaining voltage value of the battery 1 that is electrically driven becomes equal to or lower than the set value, and the state equal to or lower than the set value continues for the set time t1 (longer than the motor start time). The configuration of the electric control device is characterized in that a message indicating that the remaining battery level is insufficient is displayed on the remaining amount monitor LED 48.

  The motor 1 is electrically driven by the battery 1 as the secondary battery, and the work is carried out while driving the tilling rotor 3 and the like. During this work, the remaining battery level is displayed on the remaining level monitor 48 (S1). The operator continues the operation while checking the display of the remaining amount monitor 48, and when it is displayed that the remaining battery level is insufficient, the operation is stopped and the battery 1 is charged. Prepare for the resumption of work. The determination of “low remaining amount” by the remaining amount monitor 48 (S 2) is made assuming that the voltage VL of the battery 1 is in an area equal to or higher than the “discharge stop voltage”, and the “discharge stop voltage” is set to “constant value V 1”. Set as an added value. Accordingly, the remaining battery voltage is read during operation, and when the value of the voltage VL is equal to or less than “discharge stop voltage + V1”, the monitor LED (lit red) of the battery “low remaining amount” is turned on (S3). .

  Further, in the form in which the battery remaining amount shortage is displayed by the decrease in the remaining voltage value of the battery 1 and the continuation of the decrease time, the elapse of the set time from the start of operation or the load current value is detected below the set value. Until it is done, the shortage is not displayed.

  As described above, the remaining battery voltage is read during operation (S1), and when the remaining battery voltage VL is (S2), which is equal to or less than the VL (discharge stop voltage + V1), it is longer than the motor start time t1. By continuing (time) (S3), the red output of the remaining amount monitor 48 is turned ON (monitoring the remaining battery level) (S4).

The battery voltage determined as the remaining amount of the battery 1 is not less than the discharge stop voltage, and is a value obtained by adding a constant value V1 to the discharge stop voltage.
As described above, the battery voltage is displayed on the monitor 48 during the operation, and when the remaining battery level is low, the battery voltage is displayed as low and is notified to the driver. At this time, the battery voltage determined to be low is determined based on a voltage reference value higher than the discharge stop voltage obtained by adding the constant value V1 to the discharge stop voltage (S2). When a voltage value lower than the reference value obtained by adding the constant value V1 is detected, the remaining amount monitor 48 displays “low remaining amount” (S4).

In addition, after displaying the battery remaining shortage during the operation of the electric power management work machine, the monitor display is returned to the display indicating that the remaining amount is sufficient by detecting that the voltage value exceeds the set value.
When the work load is reduced during the operation or the voltage value is detected to be equal to or higher than the set value due to charging of the battery 1 or the like, the monitor display of the remaining battery shortage area is automatically “remaining. Control is returned to the display of “sufficient amount” (lighting of the remaining amount monitor LED edge) (S5, S9).

Further, the detection time t2 is set to be shorter than the time t1 for detecting the voltage drop (t2 <t1).
The voltage value of the battery during the electric work is constantly detected, the time t2 when the voltage value is equal to or higher than the set value, the time t1 when detecting the voltage drop, etc. are detected, and the voltage value is set. The detection time t2 is set to be equal to or greater than the value (S8), and the voltage drop is detected (S3). The time is set to be shorter than the time t1 (t2 <t1).

  When the key switch 16 is turned on, various switch signals and various detection sensor values are read. Next, it is determined whether or not the operation switch 4 is ON, and when the ON signal output of each part is an operation signal, an ON signal is output to the switching circuit 30. When this output is received, the motor drive circuit 20 enters a connected state, and the battery 1 and the electric motor 2 enter a circuit connected state and are driven to rotate.

  During operation, the current detection circuit 29 constantly monitors the control current and compares the detected current value with a predetermined value, and the breaker 38 detects the load current value of the motor drive circuit 20 to determine whether or not it is in an overload state. judge. Here, when it is equal to or less than the predetermined value and is not in an overload state, the electric motor 8 maintains the rotational drive state in order to continue the ON signal to the switching circuit 30. On the other hand, in the comparison with the predetermined value here, if it is not less than the predetermined value and exceeds a predetermined time set in advance, an OFF signal is output to the switching circuit 30 as an abnormal control current, and the electric motor 2 stops. . Both the current detection circuit 29 and the breaker 38 can protect the battery 1, the electric motor 2, wiring, and the like.

  Further, for the output limiting circuit 39 that limits the driving of the electric motor 2 when the operation switch 4 is intermittently connected, a stop output of the electric motor 2 is made. Then, it is determined whether or not the key switch 16 is turned on. When the key switch 16 is turned on, it is turned on to the switching circuit 30. On the other hand, when the predetermined time has not elapsed, the switching circuit 30 continues the OFF output. With this configuration, when the operation switch 4 is turned off, even if the operation switch 4 is turned on, the input is not accepted even if the operation switch 4 is turned on, so that the hunting operation at the start of the electric motor 2 can be suppressed. 1 and the output control circuit 39 are protected.

  Next, mainly based on FIG. 10, during charging by the charger 40, the charge completion monitor LED 59 is turned on at a constant current A1, and the supply current is turned off at A2 (see FIGS. A and B). When an operation signal is generated by the operation switch 4 and supplied to the discharge control circuit 28, current is supplied from the battery 1 and the motor 2 is rotated, the current value is read in a state where the voltage of the battery 1 becomes a predetermined value or more. (S1) If “A1” or less, the charging completion monitor LED 59 is turned on and charging continues (S2). When the current value becomes “A2” or less, the current is stopped (S3). It is possible to perform appropriate charging while suppressing the charging time.

  Further, when charging is performed by the charger 40, the monitor LED 59 remains as it is even if the current is set to “0” on the battery 1 side after the charging completion monitor is turned on (see FIGS. A and C). Charging continues even after the charging current value becomes “A1” or less and the charging completion LED is turned on (S2), and when the current value becomes “0” in the subsequent current detection (in the charging end judgment on the battery side) When the current line is cut (S4), the current output is stopped. Appropriate completion of charging is determined.

  Next, based on FIG. 11, in the remaining battery 1 detection, the threshold value (threshold value) during operation is the same as that during operation stop, and the lighting color of the monitor LED changes after the operation is stopped. Resolve the problem. A battery remaining amount monitor 48 is provided to inform the driver of the remaining amount state in two colors, red and green. When the remaining amount is low and the red LED is lit (S3), the threshold is raised. When performing the remaining amount determination, the threshold value during operation and during stop is set to the same value. When the battery voltage becomes VL or less during operation, the LED lighting color of the monitor 48 is turned “red” (low remaining amount), and the voltage for returning the LED lighting color of the monitor 48 to “green” (high remaining amount) is VH And This determination voltage is continued even after the operation is finished (S10).

  Next, based on FIG. 12, in the battery remaining amount detection, after the key switch 16 is turned off, the threshold value is not changed even if the key switch 16 is turned on. It is. As described above, when the remaining amount is informed in two colors and the remaining amount is low and the red LED is lit, when the determination is made by raising the threshold, after turning off the key switch 16, Even if it is ON, the threshold value is changed. As described above, when the battery voltage becomes VL or less during operation, the monitor 48 LED is turned on “red” (low remaining amount), and the voltage for returning the monitor 48 LED to “green” (high remaining amount) is VH. This determination voltage is continued even when the key switch 16 is turned off (S11).

  Next, based on FIG. 13, in the battery remaining amount detection, when the voltage change is equal to or greater than a certain value, it is determined that the remaining amount reduction determination is not performed, and the change in the monitor 48 LED lighting color due to load fluctuation during operation is prevented. To do. When the remaining amount of the battery is low and the red LED is lit, the remaining amount is determined by increasing the threshold value. When the voltage change is equal to or greater than a certain value, the remaining amount is not determined. When the battery voltage becomes VL or less during operation, a comparison is made with the previous voltage (S12), and when the voltage difference is less than a certain value, the monitor 48LED is lit red (low remaining amount) (S13). .

  Next, mainly based on FIG. 14, in the detection of the remaining amount of the battery, the determination remaining time of the remaining amount is cleared when the load current is above a certain level, and the motor load current becomes a large value and the battery voltage decreases. This prevents the monitor 48 with a small remaining amount from being lit. That is, when the battery voltage for determining that the remaining amount is low continues for a certain period of time, it is displayed that the remaining amount is low, and when the load current is a certain value or more, the duration is cleared. Then, the battery voltage is read during operation (S1), the motor current is read when the voltage is VL or less (S14), and the time counted for performing the abnormality determination when the current value is a certain value or more is read. Clear (S15).

  Next, mainly based on FIG. 15, when the load current is above a certain value than the average load current value, the remaining time of the remaining amount is cleared, the motor 2 load current becomes a large value, and the battery 1 voltage decreases. It is possible to prevent the monitor 48 having a small remaining amount from being lit when the display is on. In addition, the determination can be performed more reliably by setting the determination current value to the average current during operation. That is, when the battery voltage that is determined to be low is displayed for a short time when the remaining battery voltage is displayed, the average load current within a fixed time is calculated, and when the load current is equal to or greater than the average load current value The duration is cleared. Then, the battery voltage is read during operation, the motor current is read when the voltage is VL or less (S14), the average current is calculated (S16), and abnormal when the read current value exceeds the average current value above a certain level. The counting time for determination is cleared (S15).

  Next, mainly based on FIG. 16, the duration time for determining that the remaining battery level is low is distinguished based on the value of the average load current, and the appropriate low battery level is determined according to the load current. is there. That is, when the battery 1 voltage for determining that the remaining battery level is low is displayed for a certain period of time, when the remaining battery level is displayed, the average load current within a certain period of time is calculated, and the remaining battery level is determined based on the average current value. It is configured to distinguish time. Then, the motor 2 load current is read during operation (S14), the average current is calculated (S16), and the continuation time for determining that the remaining amount is low (S2) is set according to the value (S17). . When the average current is large, the duration is short, and when the average current is small, the duration is long.

  Next, mainly based on FIG. 17, in order to control the monitor power supply circuit, a charge input signal 60 is provided on the input side of the controller 44 in addition to the above, and a discharge output 61 or a charge is provided on the output side. A switch output 62, a cell balance adjustment output 63, a charge stop signal output 64, a discharge stop signal output 65, a monitor power ON output 66, a transmission / reception circuit 67, and the like are arranged. Further, as described above, VL indicates the battery remaining amount determination voltage, Vs indicates the discharge end voltage, and the relationship of Vs + v1 <VM <VL−v2 is set.

  When it continues for a certain period of time, the monitor power is cut off to appropriately prevent the battery from being discharged. A monitor circuit is provided to display the operating state. When the battery voltage drops below a certain voltage, the power supplied to the monitor circuit is cut. When the constant voltage continues for a certain time, the voltage is cut. Then, the power supply output to the monitor circuit is turned on (S20), the voltage from the cell is read (S21), the entire battery voltage is calculated (S22), and the state where the value is equal to or lower than VM (S23) is constant time. If it continues (S24), the power supply output to the monitor circuit is turned off (S25). The discharge end voltage that determines VM is the lowest voltage that does not discharge, which is determined by the cell itself. Further, the monitor power supply cut voltage can be set to a value larger than the discharge end voltage and smaller than the remaining amount determination voltage.

DESCRIPTION OF SYMBOLS 1 Battery 2 Motor 3 Tilling rotor 4 Operation (limit) switch 27 Charge control circuit 28 Discharge control circuit 37 Operation monitor 43 Monitor unit 48 Remaining amount monitor

Claims (5)

  A battery (1) of a secondary battery provided with a charge control circuit (27) and a discharge control circuit (28), and a tilling rotor (3) mounted with an electric motor (2) and driven by the battery (1) In the electric power management work machine, the remaining voltage value of the battery (1) for driving the motor (2) becomes a state equal to or lower than the set value, and the state equal to or lower than the set value continues for a set time or longer. To display on the remaining amount monitor (48) that the remaining amount of the battery is insufficient.   In the form in which the battery remaining shortage is displayed by the decrease in the remaining voltage value of the battery (1) and the continuation of this decrease time, the elapse of the set time from the start of operation or the load current value is detected below the set value 2. The electric control device for an electric power management work machine according to claim 1, wherein the shortage of the remaining amount is not displayed until the operation is completed.   The battery voltage determined as the remaining amount of the battery (1) is not less than the discharge stop voltage, and is a value obtained by adding a constant value to the discharge stop voltage. Electric control device for electric management work machine.   The monitor display is returned to a display indicating that the remaining amount is sufficient by detecting that the voltage value is equal to or greater than a set value after displaying the battery remaining shortage during the operation of the electric management machine. Or the electric control apparatus of the electric management work machine of Claim 3.   5. The electric motor according to claim 1, wherein the detection time that the voltage value is equal to or greater than a set value is set as a time shorter than a time for detecting a voltage drop. Electric control device for management machines.

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