JP2000308382A - Motor controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor controller in which a dark current is prevented from flowing through a controller by interrupting the power supply to the controller after resetting the motor load when a key switch is opened. SOLUTION: A power supply on/off circuit 303 is inserted between a battery 1 and the input terminal of a constant voltage power supply 304 for a controller 305. The power supply on/off circuit 303 comprises a power supply on/off control switch inserted between the battery 1 and the constant voltage power supply 304 and being turned on upon receiving a trigger signal from the battery 1 through a key switch 6, and a trigger signal supply control switch acting after the key switch 6 is opened and the load of a motor 2 is reset to interrupt trigger signal supply to the power supply on/off control switch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control device for controlling a rotation angle position of a motor driven by a battery.

[0002]

2. Description of the Related Art When a load is driven by a motor, the load is moved from a first position (original position) to a second position when an operation command switch such as a key switch is turned on, and the operation command switch is opened. It may be necessary to power down the control circuit after returning the load from the second position to the first position when the load is turned on.

For example, in a four-wheel buggy vehicle in which the driving force of the engine is transmitted to the four wheels via a torque converter (a vehicle mainly used for traveling on rough terrain), it is necessary to make it easy to use the engine brake during braking. To
An engine brake mechanism is provided between an output shaft of the engine and a driven shaft connected to driving wheels.

This engine brake mechanism is provided between an output shaft and a driven shaft of an engine of a vehicle in which a torque converter is provided between an output shaft of the engine and a driven shaft connected to driving wheels. An engine brake operating state in which the output torque of the engine is transmitted to the driven shaft via a gear transmission mechanism without passing through a torque converter, so that a large engine brake is applied to the drive wheels, and the torque is transmitted by the gear transmission mechanism. The operation is switched to an engine brake release state in which the state in which a large engine brake is applied to the drive wheels is released by releasing the state in which the operation is performed, and the operation unit is normally operated by an operation mechanism using a DC motor as a drive source.

When the above-described engine brake mechanism is provided, a key switch (operation command switch)
If the engine brake mechanism is still operating when the engine is opened, the vehicle may move the next time the starter motor rotates the output shaft of the engine to start the engine. is there.

Therefore, in the motor control device for operating the engine brake mechanism as described above, when the operation command switch is opened, the motor is driven to return the operation section of the engine brake mechanism to the original position. , The engine brake mechanism is automatically released.

As described above, the motor control device for controlling the load to be displaced between the first position and the second position is a motor drive circuit for supplying a drive current to the motor, and is driven by the motor. A position sensor for directly detecting the position of the load displaced between the first position and the second position or from the rotation angle position of the motor, and an operation command switch closed when the motor is driven. And a controller that controls the motor drive circuit.

Normally, a motor drive circuit is connected to a power supply terminal which is always supplied with a power supply voltage from a power supply unit using a battery as a power supply, and to an input terminal of the motor for supplying a drive current to the motor. The output terminal is provided with a forward rotation command input terminal and a reverse rotation command input terminal to which a forward rotation command for instructing the motor to rotate forward and a reverse rotation command for instructing the motor to rotate in the reverse direction are input. And a switch circuit for switching the polarity of the drive current of the motor so that the motor rotates forward and reverse when a reverse rotation command is given. As the switch circuit, a circuit in which switch elements such as a bipolar transistor and an FET are bridge-connected is used.

The controller is provided so as to operate by receiving a power supply voltage from a battery through a constant voltage power supply circuit. When a condition for displacing the load to the second position is satisfied, the controller rotates the motor drive circuit forward. When a command is given and the position sensor detects the second position of the load, the supply of the forward rotation command is stopped, and when the condition for displacing the load to the first position is satisfied and when the load is at the second position. When the operation command switch is opened in this state, a reverse command is given to the motor drive circuit, and when the position sensor detects the first position of the load, the supply of the reverse command is stopped.

[0010]

As described above, when the operation command switch is opened, the motor is driven to automatically return the engine brake mechanism to the released state. Is started, the engine brake mechanism is released, so that the next engine start is performed without any trouble.

However, conventionally, in order to provide the above-described function to the motor control device, the operation command switch is opened while the power is supplied to the controller while the operation command switch is opened. There is a problem that the dark current flows through the controller even when the battery is put in, and the battery is consumed.

The present invention is not limited to the case where the operation unit of an engine brake mechanism provided in a buggy car or the like is used as a load, but is provided so as to operate by receiving a power supply voltage from a battery through a constant voltage circuit. When the condition for displacing the position is satisfied, a forward rotation command is given to the motor drive circuit, and when the position sensor detects the second position of the load, the supply of the forward rotation command is stopped, and the load is shifted to the first position. When the position sensor detects the first position of the load by giving a reverse rotation command to the motor drive circuit when the condition for displacing is satisfied and when the operation command switch is opened while the load is at the second position. When the controller is configured to stop supplying the reverse rotation command, the same problem as described above occurs.

An object of the present invention is to enable the load to automatically return to its original position when the operation command switch is opened, and then to shut off the power of the controller, so that a dark current flows through the controller. An object of the present invention is to provide a motor control device in which the problem is prevented.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a power supply terminal which is always supplied with a power supply voltage from a power supply unit using a battery as a power supply, and an input terminal of the motor for supplying a drive current to the motor. An output terminal to be connected, a forward rotation command input terminal and a reverse rotation command input terminal to which a forward rotation command for instructing the motor to rotate forward and a reverse rotation command for instructing the motor to rotate in the reverse direction are input, respectively; When a command is given and when a reverse rotation command is given, a motor drive circuit having a switch circuit that switches the polarity of the drive current of the motor so as to rotate the motor forward and reverse respectively, and a motor driven by the motor. A position sensor for detecting the position of the load displaced between the first position and the second position directly or from the rotation angle position of the motor; Target motor controller having a controller for controlling a command to be given to the motor driving circuit in accordance with the output of the position sensor.

A controller used in the motor control device to which the present invention is applied is provided so as to operate by being supplied with a power supply voltage from a battery through a constant voltage power supply circuit, and is used to displace a load to a second position. A condition for giving a forward rotation command to the motor drive circuit when the condition is satisfied and stopping the supply of the forward rotation command when the position sensor detects the second position of the load, and displacing the load first. Supply of a reverse rotation command when the position sensor detects the first position of the load when the position sensor detects the first position of the load when the operation command switch is opened when the condition is satisfied and when the operation command switch is opened while the load is at the second position. Is configured to stop.

In the present invention, a power on / off control circuit is inserted between an input terminal of a constant voltage power supply circuit for supplying a power supply voltage to a controller and a battery. The power on / off control circuit is connected between the battery and an input terminal of the constant voltage power supply circuit, and when turned on, applies a battery voltage to the input terminal of the constant voltage power supply circuit. A trigger circuit for supplying a trigger signal for turning on the power on / off control switch from the battery to the power on / off control switch through the operation command switch, and a trigger circuit that operates when a control signal is supplied and outputs a trigger signal to the power on / off control switch. And a trigger signal supply control switch for stopping supply. The controller also has
Switch state detecting means for detecting the state of the operation command switch from a voltage supplied from the battery through the operation command switch; and opening of the operation command switch detected by the switch state detection means; Control signal generating means for providing a control signal to the trigger signal supply control switch of the power on / off control circuit when the position of the control signal is detected.

The power on / off control switch is preferably constituted by a thyristor. When the power on / off control switch is configured by a thyristor, the trigger signal supply control switch is turned on when a control signal is given, and the trigger signal is supplied to the thyristor by bypassing the trigger signal from the thyristor. It is preferable to provide so as to stop the supply.

The load may be, for example, an operating portion of the above-described engine brake mechanism provided in an engine-driven vehicle.

With the above configuration, when the operation command switch is closed, the thyristor of the power supply on / off control circuit is turned on, and the voltage of the battery is applied to the constant voltage power supply circuit. As a result, the power supply voltage is supplied to the controller, and the controller starts operating.

When a condition for displacing the motor to the second position is satisfied in a state where the controller has started operation, a forward rotation command is given from the controller to the motor drive circuit. Displaced toward the second position. When the load reaches the second position and the position sensor generates a signal for detecting the second position of the load, the controller stops generating the forward rotation command, the motor stops, and the load moves to the second position. Will be retained.

In this state, if a condition for returning the motor to the first position is satisfied, a reverse rotation command is given from the controller to the motor drive circuit, so that the motor rotates reversely and the load is displaced toward the first position. Let me do. Load is first
Is reached and the position sensor generates a signal for detecting the first position of the load, the controller stops generating the reverse rotation command, the motor stops, and the load is held at the first position.

Also, when the operation command switch is opened while the load is located at the second position, a reverse rotation command is given from the controller to the motor drive circuit, and the load reaches the first position and the position sensor is activated. The supply of the reverse rotation command is stopped when the signal for detecting the first position of the load is generated. With this operation, the position of the load is returned to the first position.

When the load returns to the first position by the above operation after the operation command switch is opened, the controller gives a control signal to the trigger signal supply control switch. The supply of the trigger signal to the power on / off control switch is stopped. Therefore, the power on / off control switch is turned off, and the supply of the power supply voltage to the controller is stopped.

As described above, according to the motor control device of the present invention, the supply of the power supply voltage to the controller can be stopped when the motor load returns to the first position after the operation command switch is opened. Therefore, it is possible to prevent a dark current from flowing through the controller in a state where the operation command switch is opened, thereby preventing the battery from being consumed.

[0025]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing a configuration of a motor control device according to the present invention, and FIG.
FIG. 4 is a circuit diagram showing a configuration example of a power on / off control circuit used in the motor control device of FIG. FIG. 3 is a flowchart showing an example of an algorithm of a program executed by the controller of the control device of FIG.

In this example, the operation unit of the engine brake mechanism is assumed to be a motor load, and the operation unit of the engine brake mechanism is driven by the motor as a drive source and the engine brake release position (first position) and the engine brake operation position (first position). (A second position).

In FIG. 1, 1 is a battery, 2 is a DC motor for operating an engine brake mechanism (not shown) provided in a vehicle such as a four-wheel buggy, and 3 is a motor control device for controlling the motor 2. Reference numeral 4 denotes a speed detector for providing speed information of the vehicle to the motor control device, 5 a position sensor for generating a position signal for providing a load position from the rotation angle position of the motor, and 6 when the motor 2 can be driven. Is a key switch (operation command switch) that is closed.

The motor control device 3 includes a motor drive power supply 301 to which the output voltage of the battery 1 is input, and power supply terminals 302a and 302b
A motor drive circuit 302 applied therebetween, a power on / off control circuit 303 to which an output voltage of the battery 6 is input,
A voltage is applied from the battery 1 through the key switch 6 and the power on / off control circuit 303 to output a set constant DC voltage. A voltage supplied from the constant voltage power circuit 304 is used as a power supply voltage. An operating controller 305, a battery voltage is supplied through the key switch 6, a constant voltage circuit 306 that supplies a constant voltage signal to the controller 305 when the key switch 6 is closed, and a waveform of an output signal of the speed detector 4. A waveform shaping circuit 307 converts the signal into a waveform signal recognizable by the controller and supplies the signal to the controller 305.

The motor driving power supply unit 301 includes a diode D1 having an anode connected to the positive terminal of the battery 1, a power supply capacitor C1 connected between the cathode of the diode D1 and the ground, and charged to the terminal voltage of the battery 1. Consists of

Power supply terminal 302 of motor drive circuit 302
The power supply terminal 302b on the negative polarity side of the terminals a and 302b is grounded, and the voltage across the power supply capacitor C1 is applied between the power supply terminals 302a and 302b.

The illustrated motor drive circuit 302 has an NPN with a collector commonly connected to a power supply terminal 302a on the positive polarity side.
The transistors TR1 and TR2 and the NPN transistors TR3 and TR4, whose emitters are commonly connected to the negative power supply terminal 302b and whose collectors are connected to the emitters of the transistors TR1 and TR2, respectively, form a bridge circuit together with the transistors TR1 and TR2. Has become.

In the illustrated example, the motor driving circuit 302 is configured using transistors as switching elements, but the motor driving circuit may be configured using other switching elements such as FETs.

In the illustrated motor drive circuit 302,
The connection point between the emitter of transistor TR1 and the collector of TR3 and the connection point between the emitter of transistor TR2 and the collector of transistor TR4 are output terminals 30 respectively.
2c and 302d, and the armature of the motor 2 is connected between these output terminals.

The base of the transistor TR1 and the base of the transistor TR4 are connected to the first drive signal input terminal 30.
2e, the base of the transistor TR2 and the base of the transistor TR3 are connected to the second drive signal input terminal 30.
2f.

The illustrated power on / off control circuit 303 can be configured, for example, as shown in FIG. In FIG. 2, a is a first power input terminal connected to the positive terminal of the battery 1, b is an output terminal connected to the non-grounded input terminal of the constant voltage power circuit 304, and c is the battery through the key switch 6. A trigger signal power supply input terminal connected to the positive electrode terminal 1 is a control signal input terminal connected to an output port of the controller 305.

The power input terminals a and b are connected to the anode and cathode of a thyristor Th constituting a power on / off control switch, respectively, and a resistor R1 is connected between the gate and cathode of the thyristor Th. One end of a resistor R2 is connected to the gate of the thyristor Th.
The other end of the trigger signal power input terminal c through the resistor R3
It is connected to the. The other end of the resistor R2 is also connected to the collector of an NPN transistor TR5 whose emitter is grounded, and a resistor R4 is connected between the base and the emitter of the transistor TR5. The base of the transistor TR5 is connected to the control signal input terminal d through the resistor R5, and the resistor R6 is connected between the emitter of the transistor TR5 and the terminal d.

In the example shown in FIG. 2, the resistors R3 and R2
Thus, a trigger circuit for applying a trigger signal from the battery 1 to the thyristor Th (power on / off control switch) through the key switch 6 is configured. The transistor TR5 constitutes a trigger signal supply control switch which is turned on when a control signal is applied and which stops the supply of the trigger signal to the thyristor by bypassing the trigger signal of the thyristor Th from the thyristor. Have been.

The constant voltage power supply circuit 304 is, for example, a thyristor Th of the power supply on / off control circuit 303 from the battery 1.
And a constant voltage control circuit that detects the charging voltage of the power capacitor and stops charging the power capacitor when the detected voltage reaches a set voltage determined by a constant voltage element such as a Zener diode. And generates a power supply voltage required to drive the controller 305 across the power supply capacitor.

The controller 305 includes a RAM 305a,
ROM 305b, A / D converters 305c, 305d
And a microcomputer including an interrupt control circuit 305e and the like.

The controller 305 has ports A1 to A6.
Of these ports, ports A1 to A1
3 is used as an output port, and ports A4 to A6 are used as input ports.

The port A1 of the controller is connected to the control signal input terminal d of the power on / off control circuit 303, the port A2 is connected to the first drive signal input terminal 302e of the motor drive circuit 302, and the port A3 is connected to the motor drive circuit 302.
Are connected to the second drive signal input terminal 302e.

The port A4 of the controller 305 is connected to the output terminal of the constant voltage circuit 306 to which the voltage of the battery 1 is inputted through the key switch 6. When the key switch 6 is turned on, a constant DC voltage is applied to the port A4. Is entered. Port A4 is controller 3
A provided in the microcomputer constituting the microcomputer 05
/ D converter 305c is connected to the input terminal,
When a voltage is input to the port A4, it is recognized that the key switch 6 is turned on.

The port A5 of the controller 305 is connected to the input terminal of the interrupt control circuit 305e. The output of the speed detector 4 such as a tachometer attached to the engine is input to the port A5 through the waveform shaping circuit 307. ing.

The port A6 of the controller 305 is connected to A /
It is connected to the input terminal of the D converter 305d, and the output signal of the position sensor 5 is input to the port A6. The position sensor 5 includes, for example, a potentiometer that is coupled to the output shaft of the motor 2 via a speed reduction mechanism and outputs a position detection signal proportional to the rotation angle of the output shaft of the motor. The position of the load (in this example, the operation unit of the engine brake mechanism) is detected from the included rotation angle position information of the motor.

The microcomputer constituting the controller 305 executes a predetermined program stored in the ROM to change the state of the key switch 6 from the voltage supplied from the battery 1 through the key switch 6 and the constant voltage power supply circuit 306. A switch state detecting means for detecting that the key switch 6 has been opened by the switch state detecting means;
And a control signal generating means for applying a control signal (base current in this example) to the trigger signal side switch (transistor TR5 in the example shown in FIG. 2) of the power on / off control circuit 303 when the position is detected.

FIG. 3 shows an example of an algorithm of a program executed by the microcomputer constituting the controller 305. The operation in accordance with this algorithm is as follows.

When the key switch 6 is closed, the thyristor of the power on / off control circuit 303 is turned on,
The voltage of the battery 1 is applied to the constant voltage power supply circuit 304. As a result, the power supply voltage is supplied to the controller 305, and the controller 305 starts operating.

When the controller 305 starts operating,
First, in step 1 in FIG. 3, each section is initialized (initialized), and then in step 2 it is determined whether or not the key switch 6 is off. The determination as to whether the key switch is on or off is made based on the presence or absence of a voltage supplied from the battery 1 through the operation command switch 6 and the constant voltage circuit 306. If it is determined in step 2 that the key switch is in the ON state, the process proceeds to step 3 to determine whether the vehicle speed has reached a set value.

As a result of the determination of the vehicle speed in step 3, when the vehicle speed is lower than the set value, the process proceeds to step 4 to check whether the vehicle speed is still lower than the set value. As a result, when the vehicle speed is lower than the set value, Proceeding to step 5, the motor 2 is driven to release the engine brake. In the example shown in FIG. 1, a control signal is generated from the port A2 of the controller 305, the transistors TR1 and TR4 of the motor drive circuit 302 are turned on, and a drive current for normal rotation is supplied to the motor 2. Next, at step 6, it is determined whether or not the rotation angle position of the motor is at the position where the engine brake is released (engine brake release position). As a result, it is determined that the rotation angle position of the motor is already at the engine brake release position. Sometimes, go to step 7
2 stops the generation of the drive signal, and stops the motor 2. After stopping the motor 2, the process returns to step 2.

When it is determined in step 4 that the vehicle speed is equal to or less than the set value, and when it is determined in step 6 that the rotational angle position of the motor is not at the engine brake release position, the process returns to step 2 without doing anything.

If it is determined in step 3 that the vehicle speed is equal to or higher than the set value, then in step 8, the motor 2 is driven to operate the engine brake. That is, a control signal is supplied from the port A3 of the controller 305 to the transistors TR2 and TR3, a drive current for reverse rotation is supplied to the motor 2, and the motor 2 is rotated in the reverse direction so that the operating portion of the engine brake mechanism is directed to the engine brake operating position. Displace.

Next, at step 9, it is determined whether or not the rotation angle position of the motor has reached the engine brake operation position. As a result, when it is determined that the rotation angle position of the motor has reached the engine brake operation position, step 10 is executed.
To stop the motor and return to step 2. If it is determined in step 9 that the rotation angle position of the motor has not reached the engine brake operation position, the process returns to step 2 without doing anything.

When it is determined in step 2 that the key switch 6 is in the off state, the process proceeds to step 11 where a process for returning the rotation angle position of the motor to the engine brake release position is performed. Although not shown in detail in FIG. 3, in this processing, the same processing as in steps 5 to 7 is performed, and the motor 2 is rotated to the engine brake release position. When it is detected from the output of the position sensor that the load has returned to the engine brake release position, the routine proceeds to step 12, where the potential of the port A1 is set to the H level (high level), a control signal is output from the port A1, and power on / off control is performed. The transistor TR5 of the circuit 303 is turned on.
As a result, the supply of the trigger signal to the thyristor Th is stopped, and the thyristor Th is turned off when the anode current of the thyristor Th becomes less than the holding current.

As described above, in the motor control device of the present invention, after the key switch (operation command switch) is opened,
Since the supply of the power supply voltage to the controller can be stopped when the load of the motor returns to the first position,
It is possible to prevent a dark current from flowing through the controller when the operation command switch is opened, thereby preventing the battery from being consumed.

In the example shown in FIG.
Switch state detection means for detecting the state of the operation command switch from the voltage supplied from the battery through the operation command switch is realized, and in steps 11 and 12, the switch state detection means detects that the operation command switch has been opened, and Control signal generating means for providing a control signal to a trigger signal supply control switch of the power on / off control circuit when the position sensor detects the first position of the load is realized.

In the above example, the operation unit of the engine brake mechanism provided in a buggy car or the like is used as a load. However, the present invention is provided so that the power supply voltage is applied from a battery through a constant voltage circuit to operate. When a condition for displacing the load to the second position (in the above example, the vehicle speed is equal to or higher than a set value) is satisfied, a forward rotation command is given to the motor drive circuit to cause the position sensor to move to the second position of the load. When the position is detected, the supply of the forward rotation command is stopped, and the condition for first displacing the load (in the above example, the vehicle speed is less than the set value) is satisfied, and when the load is in the second position. The controller is configured to supply a reverse command to the motor drive circuit when the operation command switch is opened in the state described above, and to stop supplying the reverse command when the position sensor detects the first position of the load. To It is possible to Ku apply.

[0057]

As described above, according to the present invention, the supply of the power supply voltage to the controller is stopped when the motor load returns to the first position after the operation command switch is opened. Therefore, there is an advantage that it is possible to prevent the battery from being consumed by a dark current flowing through the controller in a state where the operation command switch is opened.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration example of a motor control device according to the present invention.

FIG. 2 is a circuit diagram showing a configuration example of a power on / off control circuit used in the control device of FIG. 1;

FIG. 3 is a flowchart illustrating an example of an algorithm of a program executed by a controller of the control device in FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Battery, 2 ... Motor, 3 ... Motor control device, 30
2 ... motor drive circuit, 303 ... power on / off control circuit,
304: constant voltage power supply circuit, 305: controller, 4 ...
Speed detector, 5: Position sensor, 6: Key switch (operation command switch).

Claims (3)

[Claims] A power supply terminal which is always in a state where a power supply voltage is applied from a power supply unit using a battery as a power supply; an output terminal connected to an input terminal of the motor for supplying a drive current to the motor; A forward rotation command input terminal and a reverse rotation command input terminal to which a forward rotation command for instructing the motor to rotate forward and a reverse rotation command for instructing the motor to rotate in the reverse direction are input, and the forward rotation command is given. A motor drive circuit having a switch circuit for switching the polarity of the drive current of the motor so as to rotate the motor forward and reverse when a reverse rotation command is given, respectively. A position sensor for detecting a position of a load displaced between a first position and a second position directly or from a rotation angle position of the motor; An operation command switch that is closed when the battery can be driven, and a power supply voltage that is provided from the battery through a constant voltage power supply circuit so as to operate and displace the load to the second position. When the condition of the above is satisfied, the forward rotation command is given to the motor drive circuit, the supply of the forward rotation command is stopped when the position sensor detects the second position of the load, and the load is moved to the first position. When the condition for displacing is satisfied and when the operation command switch is opened in a state where the load is in the second position, the reverse rotation command is given to the motor drive circuit, and the position sensor detects the load of the load. A controller for stopping the supply of the reverse rotation command when detecting the position of No. 1; an input terminal of a constant voltage power supply circuit for supplying a power supply voltage to the controller; And a power on / off control circuit is inserted between the battery and the battery. The power on / off control circuit is connected between the battery and an input terminal of the constant voltage power supply circuit to turn on the battery when the battery is turned on. A power on / off control switch for applying a voltage to an input terminal of the constant voltage power supply circuit, and a trigger circuit for providing a trigger signal for turning on the power on / off control switch from the battery to the power on / off control switch through the operation command switch. A trigger signal supply control switch that operates when a control signal is supplied and stops supply of a trigger signal to the power on / off control switch. The controller is configured to control the operation command switch from the battery. Switch state detection for detecting the state of the operation command switch from the voltage given through Stage and, the said operation command switch by the switch state detection means is detected to have been opened, and a first of said position sensor the load
And a control signal generating means for applying the control signal to a trigger signal supply control switch of the power on / off control circuit when the position of the motor is detected. 2. A power supply terminal in which a power supply voltage is always applied from a power supply unit using a battery as a power supply, an output terminal connected to an input terminal of the motor for supplying a drive current to the motor, and A forward rotation command input terminal and a reverse rotation command input terminal to which a forward rotation command for instructing the motor to rotate forward and a reverse rotation command for instructing the motor to rotate in the reverse direction are input, and the forward rotation command is given. A motor drive circuit having a switch circuit for switching the polarity of the drive current of the motor so as to rotate the motor forward and reverse when a reverse rotation command is given, respectively. A position sensor for detecting a position of a load displaced between a first position and a second position directly or from a rotation angle position of the motor; An operation command switch that is closed when the battery can be driven, and a power supply voltage that is provided from the battery through a constant voltage power supply circuit so as to operate and displace the load to the second position. When the condition of the above is satisfied, the forward rotation command is given to the motor drive circuit, the supply of the forward rotation command is stopped when the position sensor detects the second position of the load, and the load is moved to the first position. When the condition for displacing is satisfied and when the operation command switch is opened in a state where the load is in the second position, the reverse rotation command is given to the motor drive circuit, and the position sensor detects the load of the load. A controller for stopping the supply of the reverse rotation command when detecting the position of No. 1; an input terminal of a constant voltage power supply circuit for supplying a power supply voltage to the controller; A power on / off control circuit is inserted between the battery and the battery, and the power on / off control circuit is turned on by connecting an anode-cathode circuit between the battery and an input terminal of the constant voltage power supply circuit. A thyristor for applying the voltage of the battery to an input terminal of the constant voltage power supply circuit, a trigger circuit for applying a trigger signal from the battery to the thyristor through the operation command switch, and an ON state when a control signal is given And a trigger signal supply control switch for stopping the supply of the trigger signal to the thyristor by bypassing the trigger signal from the thyristor, and wherein the controller passes the operation command switch from the battery. A switch state detection for detecting a state of the operation command switch from a given voltage. Means and said operation command switch by the switch state detection means is detected to have been opened, and a first of said position sensor the load
And a control signal generating means for applying the control signal to a trigger signal supply control switch of the power on / off control circuit when the position of the motor is detected. 3. The load of the motor is provided between an output shaft of the engine and a driven shaft of a vehicle in which a torque converter is provided between an output shaft of the engine and a driven shaft connected to a drive wheel. An engine brake operating state in which the output torque of the engine is transmitted to the driven shaft via a gear transmission mechanism without passing through the torque converter, so that a large engine brake acts on the drive wheels. 2. The operation unit of the engine brake mechanism that is switched to an engine brake release state in which a state in which torque is transmitted by the gear transmission mechanism is released and a state in which a large engine brake acts on the drive wheels is released. 3. 3. The motor control device according to 2.