JPH08172704A - Electric vehicle - Google Patents

Abstract

PURPOSE: To provide an electric vehicle which has a small load at the time of manually pushing and in which the safety is improved by electrically braking when the speed is increased. CONSTITUTION: An electromagnetic brake releasing switch 22 for releasing an electromagnetic brake in the case of manually pushing is provided. A controller 2 for releasing dynamic braking by a motor controller 7 when the signal from the switch 22 is input and dynamic braking by the controller 7 when the traveling speed at that time exceeds a predetermined value is provided. Thus, at the time of traveling by manual pushing, it can be manually pushed by a small load, and when reaching a predetermined speed, the dynamic braking is executed, and hence the safety can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle such as an electric wheelchair or an electric vehicle that is driven by driving an electric motor.

[0002]

2. Description of the Related Art Conventionally, an electric vehicle of this type has a riding portion for a user and runs by rotating a wheel by driving a motor by a battery, and the traveling speed is controlled by an accelerator provided on an operation panel or feet. It is known that the vehicle travels at a desired speed according to an instruction. Then, when the instruction speed from the accelerator becomes zero while the electric vehicle is traveling, the motor performs dynamic braking to decelerate. Furthermore, when entering the stop operation,
An electromagnetic brake that detects that the rotation speed of the wheels has become zero and is installed in the motor to stop the rotation of the motor, stops the rotation of the motor by pressing the brake plate against the rotating plate that rotates with the motor. It works, and it surely starts to stop. In addition, when the vehicle is stored in a warehouse or moved in a narrow place after stopping, it is often pushed manually by the user.For this reason, the motor and wheels are connected to release the connection between the motor and wheels. A mechanical clutch is provided for disengaging the mechanical clutch by the user's hand, and the manual clutch can be pushed by operating the mechanical clutch.

However, when the user pushes the electric vehicle as described above by hand, since the driving wheels are opened by the mechanical clutch, the vehicle is downhill in the middle of pushing and the weight of the electric vehicle is used. It could be rolling regardless of the person's will, and it was very dangerous.

In order to solve such a problem, it is conceivable to open the electromagnetic brake with the mechanical clutch engaged. In this case, with respect to FIGS. 6 and 7, the control circuit of the electric vehicle will be described with respect to the switching control of the forward and reverse rotation of the motor by the FET and the switching control of the forward and reverse rotation by the relay.

First, control of forward / reverse rotation by the FET will be described.

A power switch 1 for energizing a control circuit and a motor M is connected to a microcomputer 2 (hereinafter referred to as a microcomputer),
When the switch 1 is turned on, a signal is input to the microcomputer 2.

Reference numeral 3 denotes an accelerator volume for converting the traveling speed instructed by the user into an electric signal. The accelerator volume 3 is interlocked with an accelerator lever (not shown) so that the user can rotate the accelerator lever. You can indicate the speed by the amount of movement.

Reference numeral 4 is a motor encoder for detecting the rotation speed of the running motor M or the driving wheels. A rotation speed signal from the motor encoder 4 is input to the microcomputer 2, and the signal and the speed commanded by the user. The traveling speed is feedback-controlled so as to be the instructed speed by comparing and with the microcomputer 2.

Reference numeral 5 denotes a battery serving as a power source, and the battery 5 uses a rechargeable lead acid battery. Further, a constant voltage circuit 6 is connected to the battery 5, which reduces the voltage and supplies power to the microcomputer 2.

Reference numeral 7 is a motor control circuit for PWM-controlling the drive of the motor M. The motor control circuit 7 is a control element connected to the motor M, FETs 1 and 4, or FET.
The rotation speed of the motor M changes depending on how long 2 and 3 are turned on. Further, the motor control circuit 7 controls the rotation direction of the motor M by turning on either the FETs 1 and 4 or the FETs 2 and 3.
That is, the traveling direction is switched.

Further, the motor control circuit 7 controls the F
By turning on ET3 and ET4, it is possible to apply power generation braking by the motor M, and the motor control circuit 7 outputs a signal of a commanded speed zero from the accelerator volume 3 or the values of the motor encoder 4 and the accelerator volume 3 to the microcomputer. When compared with 2 and exceeds the instructed speed, a signal is input from the microcomputer 2 to perform dynamic braking. The dynamic braking of the motor control circuit 7 is 100% when the difference between the accelerator volume 3 and the actual traveling speed is large, and 80% when the difference is small.
The control to apply the braking stepwise at 60% is performed. Then, when stopped, assuming that the electromagnetic brake does not operate, 100% energization of the FET is performed to perform braking. The value of% at this time is a ratio of how long the FET is turned on within a predetermined cycle.

Reference numeral 9 is an electromagnetic brake control circuit for operating an electromagnetic brake (not shown) when the motor encoder 4 detects zero instructed speed of the accelerator volume 3 and zero traveling speed, that is, when the vehicle is stopped. The electromagnetic brake control circuit 9 cuts off the current flowing through the electromagnetic brake coil 10 during traveling to operate the electromagnetic brake. In this electromagnetic brake, a brake shoe that is capable of pressure contact is provided on a rotary plate that rotates together with the rotary shaft of the motor M, and by stopping energization of the electromagnetic brake coil 10, the brake shoe is pressed against the rotary plate. It means that the rotation of the motor M is stopped.

Reference numeral 21 is a forward / backward changeover switch for switching the direction in which the user wants to travel.
A signal is input to the microcomputer 2 by switching between forward and reverse, and the rotation direction of the motor M is controlled by controlling the FETs 1 and 4 or the FETs 2 and 3 from the motor control circuit 7 according to an instruction from the microcomputer 2.

Next, the operation will be described.

When the vehicle normally travels, the resistance value of the accelerator volume 3 changes according to an instruction from the accelerator lever, and the motor M is driven at a speed corresponding thereto to travel. Further, when decelerating, when the actual speed from the motor encoder 4 becomes faster than the speed commanded by the accelerator lever, the motor control circuit 7 turns on the FETs 3 and 4 to make a closed circuit in the motor M, and the dynamic braking is performed. This is what happens. Further, when the vehicle is stopped, the electromagnetic brake works and the drive wheels are fixed. In FIG. 6, the direction indicated by the solid line arrow indicates the flow of the motor current during forward movement. Further, in FIG. 6, the direction indicated by the broken line arrow indicates the direction in which the motor current flows during dynamic braking during forward movement.

Next, when the user pushes by hand, the electromagnetic brake is released manually by an external means so that the drive wheels can rotate freely.

In the case of the control by the FET as described above, when the speed instruction signal from the accelerator volume 3 is zero, the normal FET is used so that the braking is effective even if the electromagnetic brake is damaged.
3 and 4 are kept in the ON state, and the dynamic braking is always applied. Therefore, when the drive wheels are rotated, the motor M rotates and the same state as during deceleration, that is, a closed circuit is formed and dynamic braking is applied, which causes a problem that it becomes very heavy and difficult to move. The flow of the motor current at this time is the same as that at the time of the above-described dynamic braking, and is indicated by a dashed arrow in FIG.

Next, control of forward and reverse rotation by the relay will be described with reference to FIG.

However, since only the part of the forward / reverse switching circuit is different from the case of the FET control described above, only this part will be described.

Reference numeral 11 is a forward / reverse switching circuit for switching the rotation direction of the motor M. Relay coils RL-2 and RL-3 are connected to the forward / reverse switching circuit 11, and the relay coil RL-2 and RL-3 are connected to the forward / reverse switching circuit 11 according to a user's running direction instruction. , A switch for switching the connection of the motor M to the forward rotation or the reverse rotation depending on whether or not the relay coil is energized, that is, the relay switches RL-2, R.
By turning L-3 ON or OFF, the direction of current flow to the motor M is switched to switch the rotation direction of the motor M. The switching of the rotation direction is switched according to the instruction of the forward / reverse switching switch 21.

The operation of this circuit will be described.

When the vehicle normally travels, the resistance value of the accelerator volume 3 changes according to an instruction from the accelerator lever, and the motor M is driven accordingly to travel. When decelerating, the relay switch RL-2, so that the motor M forms a closed circuit when the actual speed from the motor encoder 4 becomes higher than the speed commanded by the accelerator lever.
The RL-3 is rotated in the opposite direction to the traveling direction instructed so that the dynamic braking is applied. Further, when the vehicle is stopped, the electromagnetic brake works and the drive wheels are fixed. In FIG. 7, the direction indicated by the solid line arrow indicates the flow of motor current during forward traveling. The direction indicated by the broken line arrow indicates the direction in which the motor current flows when the dynamic braking is applied during forward traveling. At this time, the relay switches RL-2 and RL-3 are switched to the opposite side.

Next, when the user pushes by hand, the electromagnetic brake connected to the motor M is released by manually operating the external means so that the drive wheels can freely rotate.

In the case of the switching control of the traveling direction by the relay switch as described above, the relay switches RL-2, R
L-3 is switched to the reverse side when the driving side is switched, for example, when the vehicle is stopped by the dynamic braking after traveling forward, and when the manual push is performed, the motor M rotates when the drive wheels are rotated. However, the closed circuit causes dynamic braking, which makes it very heavy and difficult to move. The flow of the motor current at this time is shown by a dashed arrow in FIG. 7, as in the above-described dynamic braking.

Although the two types of control have been described only for forward rotation, the flow of current is only reversed, and similar problems occur during reverse rotation.

[0026]

As described above, when pushing by hand, for example, when going downhill, it does not roll alone and does not run regardless of the intention of the user. It is an object of the present invention to provide an electric vehicle that has a very low load and is extremely safe.

[0027]

The present invention is directed to a motor for rotating a drive wheel, a motor control circuit for controlling driving of the motor and dynamic braking, and an electromagnetic brake control for controlling an electromagnetic brake for stopping the rotation of the motor. A circuit, a traveling speed detector for detecting a traveling speed, and an accelerator volume for instructing the number of rotations of the motor are provided, an electromagnetic brake release switch for releasing the electromagnetic brake is provided, and a signal from the electromagnetic brake release switch is provided. When input, the motor control circuit releases the dynamic braking, and when the signal from the traveling speed detector exceeds a predetermined value, the motor control circuit operates the dynamic braking.

Further, a motor for rotating the drive wheels, a motor control circuit for controlling driving of the motor and dynamic braking, an electromagnetic brake control circuit for controlling an electromagnetic brake for stopping the rotation of the motor, and a traveling speed are detected. A traveling speed detector,
An accelerator volume that indicates the rotation speed of the motor,
A switch for opening and closing the motor circuit is provided, and an electromagnetic brake release switch for releasing the electromagnetic brake is provided,
When a signal from the electromagnetic brake release switch is input, the switch opens a motor circuit, and when the signal from the traveling speed detector exceeds a predetermined value, the control circuit closes the motor circuit. Characterize.

Further, a forward / reverse switching circuit for controlling the rotation direction of the motor by switching the switch and a forward / reverse detection circuit for detecting the rotation direction of the motor are provided, and the control circuit is provided when the motor circuit is opened. It is characterized in that the switch is switched in the same direction as the rotation direction of the motor, and when the motor circuit is closed, the switch is switched in the opposite direction to the rotation direction of the motor.

The control circuit operates the electromagnetic brake when the signal from the traveling speed detector reaches a second predetermined value larger than the predetermined value.

Further, when there is a signal from the accelerator volume and a signal from the traveling speed detector is input, the input of the electromagnetic brake release switch is not accepted.

Further, when the signal from the accelerator volume is input after the electromagnetic brake release switch is input, the signal from the accelerator volume is not accepted.

[0033]

According to the structure of claim 1 of the present invention, when the electric vehicle is pushed by hand, the electromagnetic brake operating during stoppage is
By pressing the electromagnetic brake release switch, the electromagnetic brake is released to release the rotation of the motor, and the motor control circuit releases the dynamic braking. Further, the speed of manual pushing is detected by the traveling speed detector, and when the speed reaches a predetermined speed, the control circuit issues a signal so that the motor control circuit operates the dynamic braking, thereby applying the braking.

According to the second aspect of the present invention, when the electric vehicle is manually pushed, the electromagnetic brake that is operating while the electric vehicle is stopped is released by pressing the electromagnetic brake release switch. The circuit of the motor is opened by the switch so that the dynamic braking is not applied even if the motor is rotated by hand. Further, the speed of pushing by hand is detected by the traveling speed detector, and when the speed reaches a predetermined speed, the signal from the control circuit causes the motor control circuit to switch the switch so that the motor circuit is closed. Emit and brake.

When the motor circuit is opened, the switch is switched in the same direction as the traveling direction, that is, when the vehicle is moving forward, the switch is switched to the forward side, and when the motor circuit is closed, the switch is switched in the direction opposite to the traveling direction. Switching, that is, switching to the reverse side when moving forward is performed by switching the forward and backward switches when the dynamic braking is applied and when it is not applied.

When the second predetermined speed is reached, which is faster than the predetermined speed while being pushed by hand, it is judged as a dangerous speed, and the electromagnetic brake is operated to stop and stop the rotation of the motor.

Furthermore, when the vehicle is traveling, that is, when there is a signal from the accelerator volume and a signal from the traveling speed detector is input, the electromagnetic brake release switch is not accepted.

After the signal from the electromagnetic brake release switch is received, the signal from the accelerator volume is not accepted, and the motor does not rotate according to the accelerator volume even if there is a signal from the accelerator volume in the manual pushing state.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 1 to 5 by taking an electric tricycle as an example.

Reference numeral 12 is a main body of an electric three-wheeled vehicle, a drive wheel 13 rotated by a motor M described later is provided at the rear of the main body 12, and one front wheel (not shown) is provided at the front. The front wheels are connected by a handle shaft 14, and a bar handle 15 is provided above the handle shaft 14. By moving the bar handle 15 to the left or right, the front wheels can be moved to the left or right to steer the vehicle.

Reference numeral 16 denotes a floor portion provided between the drive wheels 13 and the front wheels for the user to put his / her feet on when the user gets on the floor. The floor portion 16 is a frame extending in the front and rear direction (not shown). (Not shown) is fixed on the outer periphery of which is made of resin.

Reference numeral 17 denotes a cover at the rear of the floor 16 for accommodating a battery, a motor, a speed reduction mechanism, etc.
A chair 18 on which a user rides is provided above.

Reference numeral 19 denotes an accelerator lever which horizontally rotates about one point and is biased by a spring so as to always return to the front side.

Reference numeral 20 is a display panel provided with a display section for displaying the remaining amount of the battery and the like, and switches for switching between forward and backward movement and maximum speed.

Next, the control circuit of this embodiment will be described.

Since this embodiment has almost the same circuit configuration as that of the prior art shown in FIG. 6, the same parts are designated by the same reference numerals, and only different parts will be described.

Reference numeral 22 is an electromagnetic brake release switch for manually releasing the electromagnetic brake for stopping the rotation of the motor M. The electromagnetic brake release switch 22 is provided on the display panel 20 and is operated by operating the electromagnetic brake release switch 22. Release the electromagnetic brake electrically. Further, the electromagnetic brake release switch 20 does not operate until power is turned on by the power switch 1. When the electromagnetic brake release switch 22 is turned on, a signal is input to the control circuit, that is, the microcomputer 2, and a current is supplied from the electromagnetic brake control circuit 9 to the electromagnetic brake coil 10, so that an electromagnetic brake (not shown) provided in the motor M is provided. ) Is opened by the action of an electromagnet.

Next, the operation will be described.

When traveling, when the power switch 1 is turned on, a current flows through the relay coil RL-1, and the relay switch RL-1 is turned on in conjunction therewith, a current flows through the microcomputer 2, and the motor M can be energized. It will be in a state.
Then, the resistance value of the accelerator volume 3 changes in association with the movement of the accelerator lever 19, and the microcomputer 2
Signal is output from the motor control circuit 7 to the FET1,
4 or the FETs 2 and 3 can be PWM-controlled to rotate the motor M at the motor rotation speed instructed by the user. In addition, FET1, 4 or FET2, 3
By performing PWM control on either of them, the rotation direction of the motor M can be controlled, and the main body 12 can be moved in accordance with the user's instruction from the forward / reverse switching switch 21. The direction indicated by the solid arrow in FIG. 1 indicates the direction in which the motor current flows during forward traveling.

Next, the case of decelerating from the normal running will be described.

During traveling, when the instructed speed signal from the accelerator volume 3 becomes zero, or when the actual speed from the motor encoder 4 exceeds the speed from the accelerator volume 3, the motor is controlled by the signal from the microcomputer 2. Circuit 7
Therefore, either FET3 or FET4 is controlled for dynamic braking. As a result, a closed circuit is formed between the motor M and the FETs 3 and 4, and the rotation of the motor M causes dynamic braking to decelerate. At this time, the power generation braking circuit 8
The FETs that are turned OFF are turned on longer as the speed of the FETs increases due to the difference in speed, and a larger braking is applied. Regarding the control of the FET when traveling forward, normally F
When ET1 and FET4 are turned on and FET3 or FET4 is turned on in a state where dynamic braking is applied, a closed circuit is created. The direction of the motor current during dynamic braking is the direction indicated by the alternate long and short dash line in FIG.

When the microcomputer 2 inputs that the speed gradually decreases and the speed signal from the traveling speed detection circuit, that is, the motor encoder 4 is zero, the electromagnetic brake control circuit 9 supplies the electromagnetic brake coil 10 with electricity. Turn off and the electromagnetic brake operates and stops.

Further, a state in which the vehicle is stored in a garage or moved within a small range when manually pushed will be described with reference to the flowcharts of FIGS. 3 and 4.

First, the power switch 1 is turned on by the user.
When the electromagnetic brake release switch 22 is turned on (S2), the microcomputer 2 determines that it is in the manually pushed state. Then, the electromagnetic brake is opened by the operation of the electromagnetic brake coil 10 by the signal from the electromagnetic brake control circuit 9 (S3), and the FET3 and FET4 are turned off by the motor control circuit 7 by the signal from the microcomputer 2.
The control is performed so that the dynamic braking is not applied (S9), and the main body 12 is manually pushed without applying a load. The direction of the current flow at this time is shown by a dashed arrow in FIG.

Next, when the vehicle travels downhill in such a state and the traveling speed increases irrespective of the user's intention, the speed signal from the traveling speed detector 4 for detecting the traveling speed is preset. When the predetermined value v is exceeded (S10), the microcomputer 2 judges that the speed is a little dangerous, and the microcomputer 2 outputs a signal to the motor control circuit 7 to turn on the FETs 3 and 4.
Then, the dynamic braking is operated (S11). Furthermore, when the speed increases and reaches a predetermined speed V that is a critical speed (S12), a signal is output to the electromagnetic brake control circuit 9 to stop the energization of the electromagnetic brake coil 10 to turn on the electromagnetic brake. It operates (S13) and brakes to stop the drive wheels (S14).

Next, the operation before entering the manual pushing operation will be described. After the first power switch is turned on (S1), the electromagnetic brake release switch 22 is first entered (S2) and the accelerator is pushed (S4). Even if the speed instruction signal from the volume 3 is input, it is not accepted, and the hand-pushed state is maintained as it is (S5). Further, after the power switch 1 is turned on (S1), when the speed instruction signal from the accelerator volume 3 is input (S6), the normal traveling is continued, and even if the electromagnetic brake release switch 22 is turned on during traveling (S8). Do not accept and continue traveling (S7).

Next, the control circuit of the second embodiment will be described with reference to FIG.

Since this embodiment has almost the same circuit configuration as that of the prior art shown in FIG. 7, the same parts are designated by the same reference numerals, and only different parts will be described.

Reference numeral 23 is a forward / reverse rotation detection circuit for detecting the rotation direction of the drive wheel 13. The forward / reverse rotation detection circuit 23 inputs a rotation direction signal to the microcomputer 2.

Next, the operation will be described.

When traveling forward, turn on the power switch 1.
By doing so, the relay coil RL-1 is energized, the relay switch RL-1 is turned on in conjunction with this, a current is supplied to the microcomputer 2, and the motor M becomes energizable. And
Accelerator volume 3 interlocked with the movement of the accelerator lever 19
The resistance value of is changed, a signal is output from the microcomputer 2 to the motor drive circuit 7 according to this value, and the FETs 1 and 2 are PWMed.
By controlling, the motor M can be rotated at the motor rotation speed designated by the user. Further, when the user indicates the traveling direction by the forward / reverse changeover switch 21, the connection of the motor M is switched by the forward / reverse changeover circuit 11, and the main body 12 is moved in the direction indicated by the forward / reverse changeover switch 21 by the user. You can When moving forward, RL-2 and RL-3 are switched to the positive side in FIG. 2, and when moving backward, they are switched to the reverse side. In FIG. 2, the direction indicated by the solid line arrow is the flow of motor current during forward traveling.

Next, the case of decelerating from the normal running will be described.

When the instructed speed signal from the accelerator volume 3 is zero, or when the actual speed from the motor encoder 4 exceeds the speed from the accelerator volume 3,
RL-2 and RL-3 are in a direction opposite to the traveling direction, for example,
When moving forward, the switch is switched in the opposite direction, and the motor M
A closed circuit is created between the FET and FET2, and dynamic braking is applied to decelerate. The current flow at this time is shown by a one-dot chain line in FIG.

Further, when the microcomputer 2 inputs that the speed gradually decreases and the speed signal from the traveling speed detection circuit, that is, the motor encoder 4 is zero, a signal is output to the electromagnetic brake control circuit 9 to cause the electromagnetic brake. Coil 10
Power is cut off and the electromagnetic brake operates to stop the vehicle.

Further, a state in which the vehicle is stored in a garage or moved within a small range and manually pushed will be described with reference to FIGS. 3 and 4.

First, the power switch 1 is turned on by the user.
When the electromagnetic brake release switch 22 is turned on (S1) (S2), the microcomputer 2 determines that it is in the manually pushed state. Then, the electromagnetic brake is opened by the operation of the electromagnetic brake coil 10 in response to a signal from the electromagnetic brake control circuit 9 (S3), and the manual pushing direction detected by the forward / reverse rotation detecting circuit 23 is fetched into the microcomputer 2 and the microcomputer 2
The forward / reverse rotation switching circuit 11 switches the switches RL-2 and RL-3 to the same traveling direction position as the detected traveling direction. For example, when the traveling direction is forward, it switches to the positive side. By switching in this way, the motor M becomes a circuit that cannot be closed, and dynamic braking is not applied (S9). When the hand-pushing direction is switched midway, the relay is switched each time the forward / reverse rotation detection circuit 24 moves (S9). The flow of current at this time is shown by a dashed arrow in FIG.

Next, in such a state, when the vehicle approaches a downhill or the like and the traveling speed increases regardless of the intention of the user, the speed signal from the traveling speed detector 4 for detecting the traveling speed is preset. When the predetermined value v is exceeded (S10), the microcomputer 2 judges and outputs a signal from the microcomputer 2 to the forward / reverse rotation switching circuit 11 to set the relay switches RL-2, RL-3 to the position opposite to the traveling direction. Switching is performed, and braking by power generation is applied to decelerate (S11). The direction in which the motor M current flows at this time is the direction indicated by the alternate long and short dash line in FIG. 2, as in the case of the dynamic braking described above. Further, when the speed increases and reaches a predetermined speed V which is a critical speed (S12), a signal is output to the electromagnetic brake control circuit 9 to stop energization of the electromagnetic brake coil 10 and the electromagnetic force is applied to the electromagnetic brake coil 10. The brake is operated (S13) to brake (S14).

Next, the operation before entering the manual pushing operation will be described. Similar to the first embodiment, after the first power switch 1 is turned on (S1), the electromagnetic brake release switch 22 is turned on first (S2). When the vehicle is in the hand-pushed state (S4), even if the speed instruction signal from the accelerator volume 3 is input, it is not accepted and the hand-pushed state is maintained as it is (S5).
Further, after the power switch 1 is turned on (S1), when the speed instruction signal from the accelerator volume 3 is input (S6), normal traveling is continued and the electromagnetic brake release switch 22 is activated during traveling.
Even if is entered (S8), it is not accepted and the vehicle continues traveling (S7).

In the above-mentioned first and second embodiments, only the control at the time of forward traveling is shown, but the operation is the same in the case of reverse traveling, only the direction of the motor current and the connection of the relay switch are reversed. is there.

[0070]

As described above, the electric vehicle of the present invention is provided with the electromagnetic brake release switch for releasing the electromagnetic brake, and when the signal from the electromagnetic brake release switch is input, the motor control circuit releases the dynamic braking, and the traveling speed is reduced. Since it has a control circuit that operates the dynamic braking by the motor control circuit when the signal from the detector exceeds the predetermined value, the dynamic braking is applied when the load is small when pushing by hand and the speed increases, so it is very It's safe.

Further, an electromagnetic brake release switch for releasing the electromagnetic brake is provided, and when a signal from the electromagnetic brake release switch is input, the switch opens the motor circuit,
When the signal from the traveling speed detector exceeds a predetermined value, it has a control circuit that closes the motor circuit.As described above, the load is small when pushing by hand, and dynamic braking is applied when the speed increases. Safe to. Moreover, the circuit configuration is very simple.

A forward / reverse switching circuit for controlling the rotation direction of the motor by switching the switch and a forward / reverse detection circuit for detecting the rotation direction of the motor are provided.
When the motor circuit is opened, the switch is switched in the same direction as the motor rotation direction, and when the motor circuit is closed, the switch is switched in the opposite direction to the motor rotation direction, so the motor circuit is opened / closed using the forward / reverse switching switch of the motor. It is possible to simplify the circuit configuration.

Further, since the control circuit operates the electromagnetic brake when the signal from the traveling speed detector reaches the second predetermined value which is larger than the predetermined value, the electromagnetic brake operates at the critical speed. Since it stops, safety is improved.

Further, when there is a signal from the accelerator volume and a signal from the traveling speed detector is input, the input of the electromagnetic brake release switch is not accepted, so that the dynamic braking does not work during traveling. And safety is improved.

Furthermore, when the signal from the accelerator volume is input after the electromagnetic brake release switch is input, the signal from the accelerator volume is not accepted.
It's very safe because it doesn't start in the pushed state.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a first embodiment of the present invention.

FIG. 2 is a control circuit diagram of a second embodiment of the present invention.

FIG. 3 is a flowchart of the first and second embodiments of the present invention.

FIG. 4 is a flowchart of the same.

FIG. 5 is an overall perspective view of the main body.

FIG. 6 is a control circuit diagram showing a conventional technique of the present invention.

FIG. 7 is a control circuit diagram of the same.

[Explanation of symbols]

 13 Drive wheel M Motor 7 Motor drive circuit 8 Dynamic braking circuit 9 Electromagnetic brake control circuit 4 Travel speed detection circuit 3 Accelerator volume 22 Electromagnetic brake release switch 2 Control circuit 11 Forward / reverse switching circuit 23 Forward / reverse detection circuit

Claims (6)

[Claims] 1. A motor for rotating a drive wheel, a motor control circuit for controlling driving and dynamic braking of the motor, an electromagnetic brake control circuit for controlling an electromagnetic brake for stopping rotation of the motor, and a traveling speed detected. A traveling speed detector and an accelerator volume that indicates the rotation speed of the motor are provided.
An electromagnetic brake release switch for releasing the electromagnetic brake is provided, and when the signal from the electromagnetic brake release switch is input, the dynamic braking is released by the motor control circuit,
An electric vehicle having a control circuit for operating dynamic braking by the motor control circuit when a signal from the traveling speed detector exceeds a predetermined value. 2. A motor for rotating a drive wheel, a motor control circuit for controlling driving and dynamic braking of the motor, an electromagnetic brake control circuit for controlling an electromagnetic brake for stopping the rotation of the motor, and a traveling speed detected. A traveling speed detector, an accelerator volume that indicates the rotation speed of the motor, and a switch that opens and closes the motor circuit, an electromagnetic brake release switch that releases the electromagnetic brake is provided, and a signal from the electromagnetic brake release switch is provided. Is entered,
An electric vehicle having a control circuit for closing the motor circuit when the switch opens the motor circuit and a signal from the traveling speed detector exceeds a predetermined value. 3. A forward / reverse switching circuit for controlling the rotation direction of the motor by switching the switch and a forward / reverse detection circuit for detecting the rotation direction of the motor are provided, and the control circuit is provided when the motor circuit is opened. The electric vehicle according to claim 2, wherein the switch is switched in the same direction as the rotation direction of the motor, and the switch is switched in the opposite direction to the rotation direction of the motor when the motor circuit is closed. 4. A control circuit for activating an electromagnetic brake when a signal from the traveling speed detector reaches a second predetermined value larger than the predetermined value. The electric car described. 5. The input of the electromagnetic brake release switch is not accepted when there is a signal from the accelerator volume and a signal from the traveling speed detector is input. The electric car described in 2. 6. The method according to claim 1, wherein when the signal from the accelerator volume is input after the electromagnetic brake release switch is input, the signal from the accelerator volume is not accepted. Electric car.