JP6722046B2 - Automatic seat opening and closing device for vehicle packing boxes - Google Patents

Description

The present invention relates to an automatic seat opening/closing device for a vehicular luggage box, and particularly to a luggage box mounted on a vehicle body frame of a vehicle and having an opening on an upper surface thereof, and having a predetermined open position and closed position with respect to the opening. Between the seats, an electric motor that drives the seats to open and close, an energization cutoff unit that can cut off energization from a battery to the motor, and a control device that can control the operation of the energization cutoff unit. The present invention relates to an automatic seat opening/closing device provided with.

The automatic seat opening/closing device is conventionally known as disclosed in, for example, Japanese Patent Application Laid-Open No. 2004-242242.

JP, 7-108870, A

By the way, in the above automatic seat opening/closing device, when the load current of the motor rises to a predetermined stop current value (that is, breaking current value), the control device immediately outputs a command signal to stop energizing to the energization breaking means. In addition, it is possible to prevent the occurrence of a failure such as a seizure of the motor or the energizing circuit portion due to the continuous increase of the load current of the motor.

However, in the conventional structure, by setting the stop current value (breaking current value) at the time of starting the motor sufficiently higher than the normal inrush current that occurs instantaneously at the time of starting the motor, the current is supplied for that inrush current (hence, the seat rotation). We are trying to avoid the inconvenience that the dynamic operation is stopped. For this reason, energization is not stopped until the load current of the motor rises to a higher stop current value.Therefore, depending on the starting situation, the load current may become excessively large even temporarily, causing seizure of the motor and energizing circuit. It may cause deterioration of durability. A technique for switching and setting the stop current value according to the situation has been proposed, but in that case, there is a problem that the control configuration becomes complicated due to the switch setting of the stop current value.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide an automatic seat opening/closing device for a vehicular packing box, which can solve the above problems with a simple structure.

In order to achieve the above-mentioned object, the present invention is mounted on a vehicle body frame of a vehicle and is pivotally supported by a luggage box having an opening at an upper surface thereof between a predetermined open position and a closed position with respect to the opening. The seat includes a seat that can be opened and closed, an electric motor that drives the seat to open and close, an energization cutoff unit that can cut off energization from a battery to the motor, and a control device that can control the operation of the energization cutoff unit. In the automatic seat opening/closing device for a vehicular cargo box, the control device includes a limiting unit operable to limit the energization, and the limiting unit interrupts the energization in an operating state of the limiting unit. The first feature is to control the energizing/interrupting means such that the current is electrically disconnected and the energization interruption time becomes longer as the load current of the motor approaches a predetermined limit current value.

In addition to the first feature of the present invention, the limiting means starts the control of intermittently interrupting the energization when the load current approaches the limited current value, which causes the operating state. The second feature is to do so.

In addition to the first or second feature of the present invention, the limiting means controls the energization intermittently based on a waveform signal having a constant amplitude and cycle and the load current. A third feature is that the start time and the interruption time of the energization are set.

Further, in the invention, in addition to any one of the first to third characteristics, when the load current of the motor exceeds a predetermined stop current value lower than the limit current value, A fourth feature is that it is provided with a stopping unit that measures the duration of the exceeded state and outputs a command signal to stop the energization to the energization interruption unit when the duration becomes a predetermined time or more. To do.

In addition to the features of any one of the first to fourth aspects, the present invention is configured such that the motor has a pair of power receiving units and is capable of forward and reverse rotations, and is connected to the pair of power receiving units, respectively. A fifth characteristic is that a pair of detection sensors capable of separately detecting the load current are provided in a pair of energization paths selectively connected to a battery.

According to the first aspect of the present invention, the control device for the automatic seat opening/closing device includes the limiting means operable to limit the energization of the motor, and the limiting means is the operating state of the limiting means. Then, since the energization interruption means is controlled so that the energization is interrupted intermittently and the interruption time of the energization becomes longer as the load current approaches the predetermined current limit value, even if the current limit value is suppressed to a low level, It is possible to reliably suppress the increase in the load current of the motor near the limit current value. As a result, it is possible to effectively prevent the seizure of the motor and the energizing circuit section due to the excessive current, and it is not necessary to set the limiting current value sufficiently higher than the inrush current, so the load current increases excessively. It is possible to improve the durability of the motor and the like by suppressing the frequency of the operation. Also, since the increase in the load current is suppressed by increasing the current interruption time as the load current approaches the limit current value in particular, the load current becomes excessive and the motor current is completely cut off before the motor is completely interrupted. The rotation can be decelerated, and a shock due to a sudden change in the seat opening/closing speed can be suppressed.

Further, according to the second aspect of the present invention, the limiting means enters the operating state when the load current of the motor approaches the limiting current value, and starts intermittent interruption control of energization. The period of the intermittent interruption control of the energization can be shortened as much as possible to simplify the control.

Further, according to the third feature of the present invention, the limiting means includes a control start timing and an energization interruption time at which the energization is intermittently interrupted based on a waveform signal of a constant amplitude and cycle and a load current. Therefore, the intermittent control of the power supply interruption by the limiting means can be accurately executed by the relatively simple control configuration, and the cost can be reduced.

Further, according to the fourth aspect of the present invention, when the load current exceeds a predetermined stop current value lower than the limit current value, the control device measures the duration of the exceeded state, and When the load current of the motor exceeds the above stop current value, the state of exceeding the stop current value is provided because the stop means that outputs a command signal to stop the energization to the energization interruption means when the continuation time exceeds the predetermined time is provided. On the condition that the current continues for a predetermined time, the energization interrupting means can stop the intermittent energization interruption by the limiting means to stop the energization. As a result, if the load current of the motor suddenly increases (that is, exceeds the stop current value) due to disturbance or the like and the state continues for a predetermined time, the power supply to the motor is completely stopped to improve the durability of the motor. It can further contribute to the improvement.

According to the fifth aspect of the present invention, the load currents of the motors are separately detected in the pair of energization paths that are respectively connected to the pair of power receiving units of the motors capable of forward and reverse rotation and that are selectively connected to the battery. Since a pair of detection sensors are provided to obtain the overcurrent caused by the short circuit of the external wiring connected to the motor on the vehicle packing box, even if the load current flowing to the motor in the reverse direction during the forward rotation and the reverse rotation of the motor is reversed. It becomes possible to detect accurately with any of the detection sensors.

Side view showing an embodiment of a dump truck to which the present invention is applied Rear view of the dump truck (view from arrow 2 in FIG. 1) Front view showing an example of a controller of the seat opening/closing device Electric circuit diagram showing an example of a control circuit for performing drive control (seat opening/closing control) of one of the left and right motors 3 is a graph showing changes over time in motor load current during motor rotation, where the solid line indicates motor forward rotation (when the seat is open) and the chain line indicates motor reverse rotation (when the seat is closed). 4A is a graph showing a change over time in the case where a motor load current suddenly increases during motor rotation, where FIG. 9A shows a change over time in the output of the adder circuit 27 in the control circuit, and FIG. The changes over time of the output and the output of the waveform signal generation circuit 29 are shown for comparison, (C) shows the changes over time of the output of the comparison circuit 28, and (D) shows the changes over time of the motor load current.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 and 2, a body frame 1 of a dump truck V as a vehicle has a luggage box 2 having an opening O on its upper surface pivotally supported so as to be tiltable, and between the luggage box 2 and the vehicle body frame 1, A known drive mechanism (not shown) for forcibly tilting the luggage box 2 rearward is interposed. In addition, a pair of left and right sides capable of opening and closing at least a part of the opening O of the packing box 2 (both left and right outer sides of the opening O in the embodiment) are provided at the upper edge portions of the left and right side plates 3 and 3 of the packing box 2. Seats S are attached respectively.

This sheet S is composed of a sheet material 4 such as cloth, and a rectangular frame-shaped sheet frame 5 that holds the sheet material 4 in a predetermined rectangular shape. The base end of the sheet frame 5 extends in the front-rear direction. The shaft portion 5a is rotatably supported by a plurality of bearing portions 6 provided at intervals on the upper edge portions of the left and right side plates 3 and 3, respectively.

Output shafts of a pair of left and right electric motors M attached to the front end portion of the luggage box 2 are interlockingly connected to the base end shaft portion 5a via a reduction mechanism 7. Therefore, when at least one of the left and right motors M is rotationally driven in one direction, the seat S on the same side is suspended from the bearing portion 6 and extends from the open position So extending along the outer surface of the side plate 3 to the bearing portion 6. To forcibly oscillate the intermediate horizontal position Sh extending horizontally outward and the intermediate standing position Sv standing vertically from the bearing portion 6 to a closed position Sc extending horizontally inward from the bearing portion 6 to a closed position Sc. In addition, when at least one of the left and right motors M is rotationally driven in the other direction, the sheet S on the same side can be forcibly opened and swung in the reverse path.

Each of the left and right motors M is composed of a direct-current and reverse-rotatable DC motor having first and second power receiving units Ma and Mb serving as input terminals during forward rotation and reverse rotation, respectively. FIG. 4 shows an example of a control circuit C that controls the driving of the left and right motors M to control the opening and closing of the left and right seats S. This circuit will be described later. The control circuit C is provided with two sets of the same circuit configuration corresponding to the left and right seats S so as to independently control the opening and closing of the left and right seats S.

Further, a driver's seat of the dump truck V, for example, an instrument panel, is provided with a controller 8 for an operator to arbitrarily open and close the seat S (see FIG. 3 ). The operation unit of the controller 8 includes a forward/reverse rotation selection switch SWm that can select forward/reverse rotation of each motor M and also serves as a power switch, and a left drive switch SWa and a right drive switch SWa for individually rotating the left and right motors M. Each operation knob of the drive switch SWb is provided.

The forward/reverse rotation selection switch SWm is composed of a toggle switch that can be switched and held in three positions. Each of the left and right drive switches SWa and SWb is composed of a momentary switch which is turned on when the operation knob is pressed once and then kept on even if the hand is released and the operation knob returns to its original position. The on-state is turned off by switching the forward/reverse rotation selection switch SWm to the neutral position.

Thus, when the operation knob of the forward/reverse rotation selection switch SWm is in the neutral position, the power of the controller 8 is turned off and the motor M is held in a stopped state. Further, when the operation knob is located on one side of the normal rotation selection position or the other side of the reverse rotation selection position across the neutral position, the power supply of the controller 8 is turned on, and the motor M can be selected from the forward rotation or the reverse rotation. Therefore, for example, when the forward/reverse rotation selection switch SWm is held at the forward rotation selection position and the operation knob of the left drive switch SWa is pressed, the control circuit C for the left seat S drives the left motor M to the forward direction. When the left seat S is opened by rolling and the operating knob of the right drive switch SWb is pressed, the control circuit C for the right seat S drives the right motor M in the forward direction to drive the right seat M. The seat S is opened.

When the operation knob of the left drive switch SWa is pressed while the forward/reverse rotation selection switch SWm is held at the reverse rotation selection position, the control circuit C for the left seat S drives the left motor M in the reverse rotation. When the left side seat S is closed and the operation knob of the right drive switch SWb is pressed, the control circuit C for the right seat S drives the right side motor M in the reverse direction to close the right side seat S. Operate.

Next, an example of the control circuit C will be described with reference to FIG. The control circuit C has a similar circuit configuration corresponding to the left and right motors M in order to independently control the opening and closing of the left and right seats S as described above. For example, two sets are provided between the body frames 1).

Next, the circuit configuration of one set will be described below. In addition, the following description will be made without particularly describing whether the motor M and the seat S are on the left or right.

The control circuit C is provided in series with the first connection path 11 and the first and second connection paths 11 and 12 interposed in parallel between the battery 10 and the ground 9, and the first connection path 11 is provided separately. A normally open first forward/reverse opening/closing means 13 and a first reverse rotation opening/closing means 15 which are opened/closed, and a normally open type which is provided in series with each other in the second connecting path 12 to individually open/close the second connecting path 12. The second normal rotation opening/closing means 14 and the second reverse rotation opening/closing means 16 and an electronic control unit U as a control device capable of controlling opening/closing of the opening/closing means 13 to 16 are provided.

The electronic control unit U includes, in addition to the CPU, a memory linked to the CPU, a hard disk, a timer unit T (none of which is shown in FIG. 4 except the CPU and the timer unit T), and a limiting circuit 40 described later. In the present embodiment, it is built in the controller 8 and operates by the electric power from the battery 10.

A first energization path 21 is provided between the first normal rotation opening/closing means 13 and the first reverse rotation opening/closing means 15 of the first connection path 11, and a second normal rotation opening/closing means 14 and a second connection path 12 of the second connection path 12. The second energization paths 22 are branched from between the reverse rotation opening/closing means 16. The first energization path 21 is connected to the first power receiving section Ma of the motor M (that is, the terminal that becomes the input side when the motor is rotated in reverse), and the second energization path 22 is connected to the second power reception section Mb of the motor M (that is, the motor positive side). The terminals that will be the input side during rotation) are respectively connected.

Further, in the first energization path 21 and the second energization path 22, when the motor M is rotating, the first and second currents flowing through the motor M, that is, the first and second energization paths 21 and 22 (that is, the load current of the motor) are detected First and second ammeters SE1 and SE2 as second detection sensors are provided, respectively.

In the present embodiment, as the first and second ammeters SE1 and SE2, voltmeters that convert the currents flowing through the first and second energization paths 21 and 22 into voltage and detect the voltage are used from the viewpoint of safety. However, even in that case, the increase/decrease in the current flowing through each of the energization paths 21 and 22 linearly corresponds to the increase/decrease in the measured value (detection voltage) of the voltmeter. If necessary, it is possible to directly detect the current flowing through the first and second energization paths 21 and 22 with an ammeter.

The first and second normal rotation opening/closing means 13 and 14 and the first and second reverse rotation opening/closing means 15 and 16 cooperate with each other to constitute the energization interruption means X of the present invention. Opening/closing control is individually performed based on energization command signals output from U via the first and second forward rotation signal paths 23 and 24 and the first and second reverse rotation signal paths 25 and 26, respectively. Thus, each of the opening/closing means 13 to 16 is normally held in an open state to shut off the corresponding connection path 11 or 12, and an energization command signal (output voltage) is applied to each of the opening/closing means 13 to 16. When it is turned on, the connection is switched to the closed state, and the corresponding connection paths 11 and 12 are made conductive, so that the motor M can be energized.

Further, in the present embodiment, the second normal rotation signal path 24 and the first reverse rotation signal path 25 are connected in parallel to the common signal path 30 extending from the CPU, whereas the first normal rotation signal path 23 and The second reverse signal path 26 is directly connected to the CPU (that is, not through the common signal path).

Then, the second forward rotation signal path 24 receives the second signal only when both the output signal from the common signal passage 30 (that is, the limiting circuit 40 described later) and the output signal from the first forward rotation signal path 23 are input. A first AND circuit 31 that outputs an energization command signal is provided to the normal rotation opening/closing means 14. The first reverse signal path 25 receives the first signal only when both the output signal from the common signal path 30 (that is, the limiting circuit 40 described later) and the output signal from the second reverse signal path 26 are input. A second AND circuit 32 that outputs an energization command signal is provided to the reversing opening/closing means 15.

Further, the electronic control unit U is connected to the above-mentioned switches SWm, SWa, SWb of the controller 8. The electronic control unit U is supplied with power from the battery 10 and can drive and control the motor M based on the operation input to the switches SWm, SWa, and SWb of the controller 8.

For example, when the forward/reverse rotation selection switch SWm is selectively held at the forward rotation selection position and one of the left and right drive switches SWa or SWb is pressed to turn on, the drive switch corresponding to the pressed operation is handled. From the CPU of the electronic control unit U, a control signal, that is, a current command value a of a constant voltage is output to the common signal path 30, and an energization command signal is output to the first forward rotation signal path 23. In response to this, the energization command signal is output from the first AND circuit 31 to the second forward/reverse opening/closing means 14, and the energization command signal is directly output to the first forward/reverse opening/closing means 13 from the CPU. Both opening/closing means 13 and 14 are closed. As a result, a circuit for normal rotation of the motor from the battery 10 to the ground 9 through the upstream part of the second connection path 12, the second energization path 22, the motor M, the first energization path 21, and the downstream part of the first connection path 11 is provided. It conducts to drive the motor M in the normal direction.

On the other hand, when the forward/reverse rotation selection switch SWm is selectively held at the reverse rotation selection position and either the left or right drive switch SWa or SWb is pressed to turn on, the electronic switch corresponding to the pressed drive switch is switched on. The CPU of the control unit U outputs a control signal, that is, a current command value a of a constant voltage to the common signal path 30, and an energization command signal to the second reverse rotation signal path 26. In response to this, an energization command signal is output from the second AND circuit 32 to the first reverse rotation opening/closing means 15, and an energization command signal is directly output to the second reverse rotation opening/closing means 16 from the CPU. The opening/closing means 15 and 16 are closed. As a result, a motor reverse circuit for reaching the ground 9 from the battery 10 via the upstream portion of the first connection path 11, the first energization path 21, the motor M, the second energization path 22, and the downstream part of the second connection path 12 is provided. It conducts and drives the motor M in reverse.

Thus, when the load current of the motor M exceeds a predetermined stop current value I ₁ when the motor M is driven to rotate normally or reversely, the electronic control unit U determines the duration t of the exceeded state. It is measured by the timer means T in the unit U, and the CPU determines whether or not the duration time t is equal to or longer than the predetermined time t ₀ . In this case, as the predetermined time t ₀ , a time (for example, 100 msec) longer than the time when the rush current at the time of starting the motor exceeds the stop current value I ₁ is preset in the CPU. The CPU and the timer means T cooperate with each other to form the stopping means 50 of the present invention.

That is, the stopping means 50 outputs a signal for stopping energization (that is, continuing energization interruption) to the energization interruption means X only when the duration time t becomes the predetermined time t ₀ or more (in the present embodiment, in the present embodiment). , The output of the current command value a output from the CPU to the common signal path 30 is stopped, and the output of the energization command signal from the CPU to the first forward rotation opening/closing means 13 and the second reverse rotation opening/closing means 16 is also stopped) However, it is possible to exhibit a noise-corresponding function that does not immediately stop all energization against a short-time increase in load current (noise, for example, inrush current) due to disturbance or the like. Therefore, as will be described later, when the load current exceeds the predetermined stop current value I ₁ for a short time (that is, a time shorter than the predetermined time t ₀ ), the energization of the motor M is in a completely stopped state. Therefore, the opening/closing operation of the seat S is not interrupted.

Further, the electronic control unit U is provided with a limiting circuit 40 as a limiting means operable to intermittently limit the energization of the motor M when the motor M is driven to rotate normally or reversely. This limiting circuit 40 is a timing at which the load current of the motor M approaches a predetermined limiting current value I ₃ higher than the stopping current value I _{1 in the} process of driving the motor M (particularly in the present embodiment, the stopping current value I ₁ When the limiting start current value I ₂ which is higher than the limiting current value I ₃ and lower than the limiting current value I ₃ is exceeded), the operation state is set. Then, the limiting circuit 40 controls the energization interruption means X so that, when it is in the operating state, even if the current command value a is in the output state, the energization to the motor M is interrupted intermittently (more specifically. Speaking specifically, it exhibits an energization suppressing function of intermittently stopping the output of the energization command signal output to the opening/closing means 14 and 15. The limiting current value I ₃ is set to a current value that is substantially the same as or relatively close to the inrush current normally assumed when the motor M is started.

The limiting circuit 40 has a cutoff time adjusting function of increasing the cutoff time t _{X of} energization as the load current of the motor M approaches the limit current value I ₃ in the above operating state. With this adjusting function, when the load current of the motor M approaches the limit current value I ₃ , it is possible to suppress the increase in the load current to a current value that is the same as or slightly lower than the limit current value I _3, and thus, for example, The inrush current at the time of starting the motor is also suppressed to the same or slightly lower current value as the limited current value I ₃ .

The limiting circuit 40 also starts the control for intermittently interrupting the energization of the motor M based on the waveform signal having a constant amplitude and cycle and the load current, as will be described later (in the present embodiment, the start timing is set to the start timing). The limiting start current value I ₂ ) used for determining and the energization interruption time t _X are set.

Next, an example of the limiting circuit 40 will be specifically described. This limiting circuit 40 is provided in the above-mentioned common signal path 30 in the electronic control unit U.

In the middle of the common signal path 30, the measured value output from the ammeters SE1 and SE2 is subtracted from the constant current command value a output from the CPU when the motor M is normally or reversely rotated as described above. An adder circuit 27 is provided. That is, in the present embodiment, the current command value a (constant voltage) output from the CPU to the common signal path 30 during rotation of the motor M and the measurement values output by the ammeters SE1 and SE2 (that is, the voltmeter of the above-described voltmeter). A voltage obtained by adding a value obtained by inverting the detection voltage) to a negative value is output from the addition circuit 27. Since the current command value a is a value for determining the above-mentioned current limit value I ₃ , the current command value different for each motor is given to the motors M of different models having different current limit values I _3. The value a is set.

Further, the common signal path 30 is provided with a comparison circuit 28 on the downstream side of the adding circuit 27 and on the upstream side of the second forward rotation signal path 24 and the first reverse rotation signal path 25. The comparison circuit 28 adds the output voltage from the waveform signal generation circuit 29, which continues to output a triangular waveform voltage signal as a waveform signal having a constant amplitude/cycle (for example, a frequency of 10 kHz) during rotation of the motor M, and the above addition. The output voltage from the circuit 27 is compared. When the load current of the motor M is relatively small and the voltage of the latter is higher than the voltage of the former, the comparison circuit 28 outputs a predetermined signal to the AND circuits 31, 32, and the load current of the motor M. Is increased and the voltage of the latter drops below the voltage of the former, the output of the predetermined signal is stopped.

As described above, the limiting circuit 40 of the present embodiment includes at least the above-described waveform signal generation circuit 29, the addition circuit 27 and the comparison circuit 28 on the common signal path 30.

Then, the first AND circuit 31 outputs a predetermined energization command signal when both the predetermined signal from the comparison circuit 28 and the output signal from the first normal rotation signal path 23 are input thereto. Then, the second normal rotation opening/closing means 14 is closed, and if not, the output of the energization command signal is stopped to open the second forward rotation opening/closing means 14 to open the second connection path 12. Cut off. On the other hand, the second AND circuit 32 outputs a predetermined energization command signal when both the predetermined signal from the comparison circuit 28 and the output signal from the second reverse rotation signal path 26 are input thereto. The first reversing opening/closing means 15 is closed, and otherwise, the output of the energization command signal is stopped to open the first reversing opening/closing means 15 to cut off the first connection path 11.

Next, the operation of this embodiment will be described. Now, when the forward/reverse rotation selection switch SWm of the controller 8 is selected and held at the forward rotation selection position and at least one of the left and right drive switches SWa and SWb is pressed to turn on, the pressed drive switch is operated. The CPU of the electronic control unit U corresponding to outputs a predetermined current command value a to the common signal path 30 and a predetermined energization command signal to the first forward rotation signal path 23. In response to this, when the first and second normal rotation opening/closing means 13, 14 are closed, as described above, the battery 10 moves upstream of the second connecting path 12, the second connecting path 22, the motor M, and the first connecting path. The motor forward rotation circuit that reaches the ground 9 through 21 and the downstream portion of the first connection path 11 is electrically connected, and the motor M is normally driven to open the seat S.

An example of the change over time in the load current when the normal rotation operation of the motor M is performed from the closed position Sc of the seat S to the open position So is shown in the timing chart of FIG. 5 (see the solid line). In the change of the load current with time, the first sharp peak indicates the inrush current at the time of starting the motor M, and the last peak is the load when the seat S reaches the open position So (open limit). A rapid increase of the current shows a state of reaching a peak near the limited current value I ₃ , and a rapid decrease of the current immediately after that means that the energization is cut off due to the lapse of the duration time t ₀ .

On the other hand, when the forward/reverse rotation selection switch SWm is selectively held at the reverse rotation selection position and either the left or right drive switch SWa or SWb is pressed to turn on, the electronic switch corresponding to the pressed drive switch is switched on. The CPU of the control unit U outputs a predetermined current command value a to the common signal path 30 and a predetermined energization command signal to the second reverse rotation signal path 26. In response to this, when the first and second reversing opening/closing means 15, 16 are closed, as described above, the battery 10 is connected to the upstream portion of the first connecting path 11, the first connecting path 21, the motor M, and the second connecting path. The motor reversing circuit reaching the ground 9 through 22 and the downstream portion of the second connecting path 12 is electrically connected to drive the motor M in the reverse direction to close the seat S.

When the reverse rotation operation of the motor M is performed from the open position So to the close position Sc of the seat S, the time change of the load current is the same as that of the normal rotation of the motor M in the initial and final stages. However, the intermediate period becomes the curve shown by the chain line in FIG.

Then, the load current at the time of forward/reverse rotation of the motor M is measured by the ammeters SE1 and SE2, and the measured value is fed back to the CPU of the electronic control unit U and the limiting circuit 40.

Thus, during forward or reverse rotation of the motor M, [1] disturbance, for example, generation of inrush current, obstacles such as stones hitting the seat S during its opening or closing, or gusts of wind blow the seat M, thereby In the case where the load temporarily increases suddenly or [2] the seat S reaches the open position So or the close position Sc and the opening/closing operation cannot be performed any more, the load current of the motor M rapidly increases. It changes and exceeds the predetermined stop current value I ₁ .

In that case, the duration t of the state in which the load current exceeds the stop current value I ₁ is measured by the electronic control unit U. In the case of the above [1], the duration t is a predetermined time t ₀ (for example, 100 msec. ), the CPU continues to output the current command value a and the energization command signal to the signal path 23 or 26, so that the motor M continues to be energized. In the case of the above [2], the CPU immediately outputs the current command value a and energizes the signal path 23 or 26 as the duration t becomes the predetermined time t ₀ (for example, 100 msec) or more. Stops the output of command signals. As a result, the energization command signal is not output from the electronic control unit U to the opening/closing means 14 or 15 in the closing operation, so that the opening/closing means 14 or 15 that was in the closing operation until then is opened and the motor M is energized. Will be completely stopped.

The counting (measurement) of the duration time t is performed every time the load current exceeds the stop current value I ₁ (that is, each time the load current exceeds the stop current value I ₁ ) before the count time. Is reset (that is, the time data counted before that time is erased), and then the operation is started. For example, if the load current again exceeds the stop current value I ₁ before reaching the predetermined time t ₀ for a short period from the start of the counting of the continuation time t, the counting time until then is reset to continue. The counting of the time t is started from 0 second.

Thus, when the load current of the motor M exceeds the predetermined stop current value I ₁ , it is confirmed that the exceeded state continues for the predetermined time t ₀ , and then the energization interruption means X energizes the motor M. Since all the motors are stopped, it is possible not only to prevent the occurrence of seizure in the motor M and the energization circuit portion due to the continuous increase in the load current of the motor M, but also to cause the load current of the motor M to be instantaneously ( That is, even when the stop current value I ₁ is exceeded (for a time shorter than the predetermined time t ₀ ), it is possible to avoid the inconvenience that the power supply to the motor M is immediately stopped completely, and the opening/closing operation of the seat S due to the disturbance or the like. Can be effectively prevented from being temporarily interrupted. As a result, the seat S can be smoothly opened and closed while avoiding the continued overload of the motor M.

By the way, the electronic control unit U of the present embodiment, when the load current of the motor M exceeds the limit start current value I ₂ which is higher than the stop current value I ₁ and lower than the predetermined limit current value I ₃ , the motor M is controlled. A limiting circuit 40 that operates so as to limit the energization to the motor M is provided. When the limiting circuit 40 is in an operating state, the limiting circuit 40 energizes the motor M even if the current command value a is in the output state. The energization interruption means X (particularly the opening/closing means 14, 15) is controlled so that the electric current can be intermittently shut off. Moreover, the limiting circuit 40 suppresses the increase of the load current by setting the cutoff time t _{X of the} energization to be longer as the load current approaches the limit current value I ₃ in this operating state.

Next, the energization suppressing function of the limiting circuit 40 will be described with reference to the timing chart of FIG. 6A to 6D, the load current of the motor M rapidly increases due to disturbance (for example, the seat S reaches the open position So or the close position Sc), and the limit start current value I ₂ is When exceeding the limit, the state is shown for a relatively short period before and after the limiting circuit 40 starts the energization suppressing function of intermittently interrupting the energization of the motor M.

In particular, (A) of FIG. 6 shows a value obtained by reversing the measured values of the ammeters SE1 and SE2 when the load current of the motor M is increased and the current command value a (that is, the addition value of the addition circuit 27). Output) over time. Further, FIG. 6B illustrates an image of the process of superimposing and comparing the added value and the triangular wave signal from the waveform signal generation circuit 29 in the comparison circuit 28. For the sake of clarity, the time width (horizontal axis) is considerably enlarged and the current change (vertical axis) is also greatly exaggerated, as is apparent from the diagram corresponding to FIG. 5 shown in the lower part of FIG.

Further, in (C), the energization command signal is intermittently output in a pulse form from the comparison circuit 28 (and therefore the AND circuit 31 or 32) only when the triangular wave signal from the waveform signal generation circuit 29 is lower than the added value. The opening and closing means 14 and 15 can be intermittently opened and closed based on the output change. Further, (D) shows a change with time of the motor load current (that is, the current flowing through the current paths 21 and 22) at the same time as (A) to (C).

Thus, the intermittent opening/closing control for the opening/closing means 14 and 15 is performed by the limiting current value I ₃ after the load current of the motor M exceeds the stop current value I ₁ (that is, while the duration time t is being measured). The control is started shortly before (i.e., when the triangular wave signal from the waveform signal generation circuit 29 becomes lower than the added value), and therefore, the load current of the motor M at the start of the control. The value becomes the limiting start current value I ₂ .

In this way, when the load current of the motor M exceeds the limit start current value I ₂ , the period in which the added value is low and the period in which the added value is high are alternately repeated in a short cycle with respect to the triangular wave signal from the waveform signal generation circuit 29. As a result, the non-output state and the output state of the control signal are alternately repeated from the comparison circuit 28 (and therefore the AND circuits 31 and 32) in a short cycle, so that the motor M is intermittently energized corresponding to the output stop period. Be shut off. In this case, as the load current approaches a predetermined limit current value I ₃ higher than the limit start current value I ₂ (that is, the above-mentioned added value becomes lower), the above-mentioned added value is added to the triangular wave signal from the waveform signal generation circuit 29. The low period becomes longer, and the intermittent output stop period of the energization command signal from the comparison circuit 28 (and therefore the AND circuits 31, 32) gradually becomes longer corresponding to this period. Therefore, as the load current of the motor M approaches the limit current value I ₃ , the cutoff time t _X of energization to the motor M is set longer, and the increase of the load current can be suppressed reasonably and accurately. ..

Thus, even if the limited current value I ₃ is suppressed to a low value, by setting the predetermined time t ₀ longer than the time when the inrush current exceeds the stop current value I ₁ , the current interruption due to the inrush current can be prevented. While avoiding, the increase in the load current of the motor M can be surely suppressed to a level equal to or slightly lower than the limited current value I _3, and for example, the inrush current at the time of starting the motor is also equal to the limited current value I _3. Or, it is suppressed to a slightly lower level. As a result, it is possible to effectively prevent the seizure of the motor M and the energizing circuit portion due to the excessive current, and it is not necessary to set the stop current value I ₁ sufficiently higher than the inrush current. The durability of the motor M and the like can be improved by suppressing the frequency at which the load current excessively increases.

Further, as described above, the energization suppression control is performed in which the energization of the motor M is intermittently interrupted shortly before the load current reaches the limit current value I ₃ (that is, when the limit start current value I ₂ is exceeded). However, in the control process, the energization interruption time t _X is lengthened as the current limit I ₃ is approached, so that the increase in the load current is suppressed so as to reach a peak just before the current limit I ₃ , so that the motor M is controlled. The rotation of the motor M (and thus the seat opening/closing operation) can be decelerated before the energization is completely stopped, and a shock due to a sudden change in the seat opening/closing speed can be suppressed.

Then, if it is confirmed that the duration time t is equal to or longer than the predetermined time t ₀ during the intermittent energization suppression of the load current, the energization of the motor M is completely stopped.

The intermittent energization suppressing function by the limiting circuit 40 described above is started when the inrush current momentarily exceeds the limit start current value I ₂ even when the motor M is started. Rapidly decreases immediately after that, the period in which the output of the adder circuit 27 (that is, the above-mentioned added value) with respect to the triangular wave signal from the waveform signal generation circuit 29 is low ends only in a very short time when the motor is started. Thus, the energization suppressing function of the limiting circuit 40 ends in a short time. At this time, since the predetermined time t ₀ is set longer than the time when the inrush current exceeds the stop current value I ₁ , the energization of the motor M is not stopped.

By the way, the ammeters SE1 and SE2 are arranged in or near the controller 8 in the driver's seat of the dump truck V, and external wiring for connecting the ammeters SE1 and SE2 to the motor M on the side of the packing box 2 is provided. In many cases, it is routed over the outer surface of the vehicle body in an exposed state. Particularly in the case of the dump truck V, in order to dump the luggage box 2 to the rear, it is necessary to route the external wiring for a long time via the periphery of the dump hinge located at the rear end of the vehicle body.

Therefore, there is a possibility that the external wiring may be damaged due to contact with another object or the like and the insulation may be short-circuited. In that case, a portion on the upstream side of the short-circuited portion (exemplified by reference numerals SP1 and SP2 in FIG. 4) Although an overcurrent may flow through the connecting paths 21 and 22, the overcurrent cannot be detected by the ammeters SE1 and SE2 in the connecting paths 21 and 22 on the downstream side of the short-circuited portion. For example, if only the first ammeter SE1 is provided for detecting the load current of the motor M, it is provided downstream of the short-circuited portion SP1 or SP2 when the motor M is normally rotated (that is, the opening/closing means 13, 14 are closed). Therefore, the overcurrent cannot be detected, and if only the second ammeter SE2 is provided, it will be located downstream of the short-circuited point SP1 or SP2 when the motor M rotates in the reverse direction (that is, the opening/closing means 15, 16 closes). Therefore, there is a possibility that an overcurrent may not be detected.

However, in the present embodiment, a pair of ammeters SE1 and SE2 capable of separately detecting the load current of the motor M are individually provided in both of the first and second connection paths 21 and 22, and therefore, when the motor rotates in the forward direction. Even if the load current flowing through the motor M in the reverse direction reverses, the overcurrent caused by the short circuit of the external wiring connected to the motor M on the vehicle luggage box 2 can be accurately measured by either of the ammeters SE1 and SE2. It becomes detectable.

Although the embodiments of the present invention have been described above, the present invention can be modified in various ways without departing from the scope of the invention.

For example, in the above-described embodiment, the FETs (field effect transistors) are used as the opening/closing means 13, 14; 15, 16 constituting the energization interruption means X, but the opening/closing means constituting the energization interruption means X is implemented. The invention is not limited to the form, and various electronic parts (for example, a relay switch etc.) having the same circuit opening/closing function can be used.

Further, in the above-described embodiment, the dump truck V is illustrated as the vehicle on which the luggage box 2 is mounted, but the present invention can be implemented in various vehicles with luggage boxes other than the dump truck.

Further, in the above-described embodiment, the seat S is pivotally supported on the left and right side plates 3 of the luggage box 2 so as to be openable and closable. It can also be implemented in a vehicle with a luggage box in which a seat is pivotally supported on a plate (for example, a tailgate) so that the seat can be opened and closed.

Further, in the above-described embodiment, the controller 8 for arbitrarily inputting the opening and closing of the seat S is provided in the driver's seat of the vehicle, but the installation location of the controller is not limited to that of the embodiment, and is not limited to the embodiment. However, it may be installed at an appropriate position where it can be operated arbitrarily, for example, at an appropriate position of the body frame 1 or the luggage box 3. Further, in the above embodiment, the ammeters SE1 and SE2 are provided in the controller 8 or in the vicinity thereof, but the installation location of the ammeter is not limited to the embodiment.

Further, in the above-described embodiment, in order to simplify the circuit configuration by sharing the limiting circuit 40 with the second forward rotation signal path 24 and the first reverse rotation signal path 25, the second forward rotation signal path 24 and the first forward rotation signal path 24 are provided. Although the limiting circuit 40 is provided in the common signal path 30 that connects the reverse rotation signal path 25 to the CPU in parallel, in the present invention, the second forward rotation signal path 24 and the first reverse rotation signal path 25 are connected to the CPU. May be directly connected to each other (that is, not through the common signal path 30), and the limiting circuit 40 is associated with each of the signal paths 24 and 25.

Further, in the above-described embodiment, as the limiting start current value I ₂ that determines the start timing of the energization suppression control for intermittently controlling the energization of the motor M, the waveform signal of a constant amplitude and cycle (that is, the waveform signal generation circuit 29 Output) and a variable that is set based on the load current of the motor M are shown, but in the present invention, the limiting start current value I ₂ is higher than the stop current value I ₁ and is limited by the limiting current value I _3. A lower constant value may be used.

Further, in the above embodiment, the current command value a, the output waveform signal of the waveform signal generation circuit 29, etc. are set so that the limit start current value I ₂ is higher than the stop current value I ₁ and lower than the limit current value I _3. In the present invention, the current command value a, the output waveform signal of the waveform signal generation circuit 29, etc. are set so that the limit start current value I ₂ becomes lower than the stop current value I _1. You may. However, even in that case, the load current when the energization of the motor M is completely stopped is set to a value higher than the stop current value I ₁ and lower than the limit current value I ₃ .

Further, in the above embodiment, the electronic control unit U is built in the controller 8 by way of example, but the installation site of the electronic control unit U is not limited to the embodiment, and the vehicle is located outside the controller 8 (for example, the driver's seat, It may be installed in the packing box or on the body frame near the packing box).

In the above embodiment, the waveform signal output from the waveform signal generation circuit 29 is a triangular wave signal. However, other waveform signals such as a sine wave signal and a rectangular wave signal can be used in the present invention. Is.

Further, in the above-described embodiment, in order to reliably detect the overcurrent when the external wiring connected to the motor M on the vehicle packing box is short-circuited, the load current of the motor is applied to the pair of energization paths 21 and 22 that sandwich the motor M. Although a pair of detection sensors SE1 and SE2 capable of detecting separately has been shown, the present invention is also applicable to a configuration in which the ammeter SE1 or SE2 is provided only on one of the energization paths 21 or 22. Good.

Further, in the above embodiment, when the load current of the motor M exceeds the predetermined stop current value I ₁ , the duration t of the exceeded state is measured, and the duration t is equal to or longer than the predetermined time t _0. However, the present invention can be applied to the case where such control is omitted in the present invention.

Further, in the above-described embodiment, when the load current of the motor M exceeds the predetermined stop current value I ₁ , the duration t of the exceeded state becomes equal to or longer than the predetermined time t ₀ , and the motor M is supplied. Although the control for stopping the energization is shown to be executed from the time point when the energization of the motor M is started, in the present invention, such control may be started after the time point when the energization of the motor M is started. Good. For example, if it is set such that the above control is started after a required time from the start of energization of the motor M to the end of the rush current, the rush current keeps the stop current value I ₁ for a predetermined time when the motor is started. Even if t ₀ or more is exceeded, the energization of the motor M can be prevented from being stopped. Thus, for example, even when the predetermined time t ₀ is set to be shorter than the time when the inrush current exceeds the stop current value I ₁ , the inrush current is prevented from being stopped while the motor M is stopped from being energized. The limiting circuit 40 can suppress the excessive current that occurs. And thus the predetermined time t _0, also inrush current is set shorter than the time that exceeds the stop current value I _1, the predetermined time t ₀ as the embodiment, inrush current stops current value I ₁ Since it is also possible to set the time longer than the time exceeding ₀ , the degree of freedom in setting the predetermined time t ₀ increases accordingly.

In the present embodiment, as limiting circuit 40 as a limiting means, operating state when the load current approaches the limit current value I ₃ (ie beyond the lower than the limited current value I ₃ limit starting current value I ₂₎ becomes, showed that starts control for interrupting intermittently the power supply to the motor M, in the present invention, before the load current approaches the limit current value I ₃ (e.g., the power supply to the motor M It is also possible that the limiting means, that is, the limiting circuit 40 is activated (from the beginning when it is started) to start the control for intermittently interrupting the energization. In this case, for example, the PWM control for intermittently controlling the energization of the motor M at a constant cycle and a constant energization cutoff time is executed immediately after the energization of the motor M is started, so that the motor M is maintained at a constant maximum speed. If the load current approaches the limiting current value I ₃ during the rotational driving, and the load current approaches the limiting current value I ₃ , the energization interruption time may be extended as the load current approaches the limiting current value I ₃ . In the above case, the control for intermittently interrupting the energization can be started without using the limiting start current value I ₂ .

Further, in the above-described embodiment, the duration t of the state in which the load current of the motor M exceeds the stop current value I ₁ is measured, and the motor M is energized when the duration t becomes the predetermined time t ₀ or more. The stop means 50 for outputting the stop command signal to the energization interruption means X (that is, the opening/closing means 13 to 16) is constituted by the CPU and the timer means T. However, in the present invention, a stop circuit different from the CPU is used. A function of determining whether or not the duration time t measured by the timer means T is equal to or longer than a predetermined time t _0, and when the duration time t is equal to or longer than the predetermined time t ₀ , the stop circuit is operated. A command signal for stopping energization may be output to the energization interruption unit X (that is, the opening/closing units 13 to 16). As described above, the stop means can be configured by using the CPU or by using a stop circuit different from the CPU, so that the degree of freedom in design can be increased accordingly.

Further, in the above-described embodiment, the energization interruption means X (that is, the interruption current _X to the motor M is intermittently interrupted and the interruption time t _X of the energization becomes longer as the load current approaches the predetermined limit current value I _3. The limiting means for controlling the opening/closing means 13 to 16) is shown as a limiting circuit 40 different from the CPU, but in the present invention, such limiting circuit 40 is omitted and the function of the limiting circuit 40 is omitted. The equivalent function may be assigned to the CPU. As described above, since the limiting means can be configured by using the limiting circuit 40 or by also being used by the CPU, the degree of freedom in design can be increased accordingly.

I ₁・・・・Stop current value I ₃・・・Limit current value M ・・・Motors Ma, Mb ・・A pair of power receiving units S ・・・Seat Sc ・・・Closed position So ・...Open positions SE1, SE2... First and second ammeters (first and second detection sensors)
t...Continuous time t ₀ ... Predetermined time t _X ... Breaking time U... Electronic control unit (control device)
V: Dump truck (vehicle)
X: energization interruption means 1... vehicle body frame 2... luggage box 3... left and right side plates (side plates)
10...Batteries 21, 22... First and second energization paths (a pair of energization paths)
40...・Restriction circuit (restriction means)
50...Stop means

Claims (5)

The vehicle is mounted on the body frame (1) of the vehicle (V) and is pivotally supported by a luggage box (2) having an opening (O) on its upper surface, and has a predetermined open position (So) with respect to the opening (O). A seat (S) capable of opening and closing swinging with respect to the closed position (Sc), an electric motor (M) for driving the seat (S) to open and close, and a battery (10) for the motor (M). An automatic seat opening/closing device for a vehicular packing box, comprising: an energization interruption means (X) capable of interrupting energization; and a control device (U) operable to control the energization interruption means (X).
The control device (U) includes a limiting means (40) operable to limit the energization,
The limiting means (40) intermittently interrupts the energization in the operating state of the limiting means (40), and the interruption time (t _X ) of the energization is set to a predetermined limiting current value (I ₃ ) to the motor. An automatic seat opening/closing device for a vehicular packing box, characterized in that the energization interruption means (X) is controlled so that the load current of (M) becomes longer as the load current approaches.
The limiting means (40) is in the operating state when the load current approaches the limited current value (I ₃ ), and starts control for intermittently interrupting the energization. An automatic seat opening/closing device for the vehicle packing box according to claim 1. The limiting means (40) sets a start timing of control for intermittently interrupting the energization and a disconnection time (t _X ) of the energization based on the waveform signal having a constant amplitude and cycle and the load current. The automatic seat opening/closing device for a vehicular cargo box according to claim 1 or 2, characterized in that. When the load current of the motor (M) exceeds a predetermined stop current value (I ₁ ) lower than the limiting current value (I ₃ ), the control device (U) continues the state of the exceeded state. Stopping means (50) which measures (t) and outputs a command signal to stop the energization to the energization interruption means (X) when the duration (t) becomes a predetermined time (t ₀ ) or more. ) Is provided, The automatic seat opening/closing device in the vehicular packing box according to any one of claims 1 to 3. The motor (M) has a pair of power receiving units (Ma, Mb) and is configured to be capable of forward and reverse rotation. The motor (M) is connected to the pair of power receiving units (Ma, Mb) and selectively connected to the battery (10). 5. A pair of detection sensors (SE1, SE2) capable of separately detecting the load current are respectively provided in a pair of energization paths (21, 22) connected to each other, according to any one of claims 1 to 4. 2. An automatic seat opening/closing device for a vehicle packing box according to item 1.

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