JP3219474B2 - Electric car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vehicle having an electric mode in which the vehicle runs by rotation of a drive motor and a manual mode in which the vehicle can be moved by hand.

[0002]

2. Description of the Related Art The following types of electric vehicles are generally known.

For example, an electric vehicle such as an electric golf cart usually has two modes that can be switched by a mode changeover switch. One is an electric vehicle that can change a traveling speed in accordance with an operation amount of an accelerator. And a manual mode in which the power to the drive motor is stopped and the user can freely move the place by pushing the electric car.

[0004] When traveling in the electric mode, the electromagnetic brake provided on the drive motor is always applied when the electric vehicle is stopped, and when the accelerator is operated, the electromagnetic brake is released and the drive is stopped. The motor rotates. Further, in the manual mode, the electromagnetic brake is always released, the drive motor is not energized, and the user can move the electric vehicle by hand when storing the electric vehicle in the hangar or the like. It has become.

However, in such an electric vehicle, when the electric vehicle is stored in the manual mode, and when the manual mode is set on a slope such as a hill, the electromagnetic brake is released simultaneously with the manual mode. Therefore, there is a problem that the electric car rolls.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an electric vehicle having an electric mode in which the vehicle runs by rotation of a drive motor and a manual mode in which the vehicle can be moved by hand.
It is an object of the present invention to provide an easy-to-use electric vehicle that does not move without permission even when the user moves away from the electric vehicle in a manual mode.

[0007]

SUMMARY OF THE INVENTION The present invention provides a drive wheel driven by a drive motor, an electromagnetic brake for stopping the rotation of the drive motor, an accelerator means for varying the rotation speed of the drive motor, and A mode changeover switch having an electric mode in which the drive motor speed can be varied according to the operation amount of an accelerator means and a manual mode in which the drive motor is not energized, wherein the mode changeover switch selects the manual mode. The electromagnetic brake is released by operating the accelerator means. Also, the electromagnetic brake is released by operating the accelerator means even when the mode changeover switch selects the electric mode.

The accelerator position of the accelerator means is mounted on a steering wheel for indicating a traveling direction.

[0009]

In the above-described means, first, in the operation in the electric mode, the electromagnetic brake is released by the operation of the accelerator means, and the drive motor starts rotating according to the operation amount of the accelerator means. Then, the drive wheels rotate and the electric vehicle runs. Also, in the manual mode, when not pressed by hand, the electromagnetic brake is applied,
Keep stopped. When the user pushes by hand, the electromagnetic brake is released by rotating the accelerator provided on the handle, and the user can move the electric vehicle by hand.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described using a golf cart as an example.
Details will be described below with reference to the drawings.

Reference numeral 1 denotes a driving wheel provided on the main body 2. The driving wheel 1 is driven by rotating a driving motor 4 using a battery 3 provided in the main body 2 as a driving source. The drive motor 4 is provided with an electromagnetic brake 5 for stopping the movement of the drive motor 4.

Reference numeral 6 denotes a steering wheel provided in front of the main body 2. The steering wheel 6 is linked with the movement of a steering wheel 7 provided on the main body 2, and the steering wheel 6 is operated by operating the steering wheel 7. The moving direction of the main body 2 can be determined by moving the main body 2.

Reference numeral 8 denotes a step provided between the two driving wheels 1 behind the main body 2, and the step 8 is designed so that the user can drive the vehicle by riding on it.

Reference numeral 9 denotes an accelerator provided on a grip on the right side of the handle 7. The rotation of the accelerator 9 increases the rotation speed of the drive motor 4. The accelerator 9 is always urged by a spring to a position where the traveling speed becomes zero.
The accelerator 9 and an accelerator circuit 14, which will be described later, are collectively referred to as accelerator means.

Reference numeral 10 denotes a mode changeover switch provided on the steering wheel 7. The mode changeover switch 10 can switch between three modes of "off", "motorized mode", and "manual mode" for stopping running. ing. First, when the mode changeover switch 10 is in the "OFF" mode, the power supply to the drive motor 4 is stopped, and the electromagnetic brake 5 is applied. Also, when in the "electric mode", if the main body 2 is in the stopped state, the electromagnetic brake 5 is applied.
The electromagnetic brake 5 is disengaged with the rotation of, and the drive motor 4 rotates. Further, when in the "manual mode", if the main body 2 is in the stopped state, the electromagnetic brake 5 is applied, and the drive motor 4 is not energized. Then, with the rotation of the accelerator 9, the electromagnetic brake 5 comes off, and the main body 2 can be moved by hand.

Reference numeral 11 denotes a mounting table on which the golf bag 12 and the like can be mounted.

Reference numeral 13 denotes a basket for storing small items and the like.

Next, a block diagram of the control circuit will be described with reference to FIG.

Reference numeral 14 denotes an accelerator circuit for converting the amount of rotation of the accelerator 9 into an electric signal.
Numeral 14 rotates the volume according to the amount of rotation, and can vary the resistance value so as to vary the rotation speed of the drive motor 4.

Reference numeral 15 denotes a power supply circuit capable of reducing the voltage from the battery 3 to a required voltage and supplying the voltage to each circuit. The drive motor 4 is supplied with power from the battery 3 via the power supply circuit 15.

Reference numeral 16 denotes an electromagnetic brake instruction circuit for performing control to release or apply the electromagnetic brake 5. The electromagnetic brake instruction circuit 16 is provided only when the accelerator circuit 14 is rotated. Work to remove 5.

Reference numeral 17 denotes a motor drive circuit for detecting a change in the resistance value from the accelerator circuit 14 and performing PWM control on the rotation of the drive motor 4. Is turned off or in the "manual mode", the drive motor 4 is not energized.

FIG. 3 is a circuit diagram of the electromagnetic brake instruction circuit 16, and the operation of the electromagnetic brake 5 will be described with reference to FIG.

In the "manual mode" or the "electric mode", when the accelerator 9 is slightly rotated, since the control of the drive motor 4 is PWM control, a small low signal is generated in a high signal at a constant period. I do. When this low signal occurs, the diode 18, resistors 19 and 20, and capacitor 21
Thus, the low signal from the accelerator circuit 14 is maintained, and the low signal is input to the comparator 22. Then, since the output of the comparator 22 becomes a high signal, the transistor 23 is turned on and the electromagnetic brake 5 is released.

When the accelerator 9 does not rotate,
A high signal is always output from the accelerator circuit 14, and the output of the comparator 22 is a low signal. Therefore, the transistor 23 is not turned on, and the electromagnetic brake 5 is applied.

Next, the operation will be described.

Normally, when the user uses a caddy or the like, he or she stands on the step 8 provided on the main body 2 and operates with the handle 7 to drive. And golf bag
12 is moved on the mounting table 11.

The case where the mode changeover switch 10 is in the "electric mode" in such a golf cart will be described. In a stop state where the accelerator 9 is not rotated, the electromagnetic brake 5 is applied and the drive is stopped. Since the motor 4 is not energized, the stop state is continued. When the user rotates the accelerator 9, a pulse is input to the drive motor 4 via the motor drive circuit 17 to rotate the drive motor 4, and the electromagnetic brake instruction circuit 16 operates to operate the electromagnetic brake. 5 is removed. Further, when the rotation of the accelerator 9 increases, the rotation of the drive motor 4 is increased by the motor drive circuit 17.

The case where the mode changeover switch 10 is in the "manual mode" will be described. The operation in this mode is usually used when storing in a hangar or changing directions in a narrow place. It is performed by the hand of the person. In this mode, when the main body 2 is in the stopped state, the accelerator 9 is not rotating, so that the electromagnetic brake 5 is applied, and the user holds the handle 7 and moves the main body 2. At the same time, the accelerator 9 is rotated, and the electromagnetic brake
Can be removed and moved by hand.

In the manual mode, the electromagnetic brake 5 can be released by rotating the accelerator 9 in the manual mode. Therefore, when the main body 2 is in the idle state, the golf cart moves freely on a slope or the like. The electromagnetic brake 5 can be detached only when moving by hand. Further, an accelerator 9 is provided on a steering wheel 7 for operating the steering wheel 6 and pushing it by hand.
By rotating the accelerator 9, the electromagnetic brake 5
Is removed, so that the operability is improved.

Further, in the electric mode, the accelerator 9
Since the circuit configuration in which the electromagnetic brake 5 is released when is rotated is used in the manual mode, there is also an effect that the circuit configuration is simplified.

[0032]

According to the present invention, in an electric vehicle having a manual mode that can be manually pushed, even if the electric vehicle is left on a slope or the like in the manual mode, the electric vehicle does not move freely, and the usability is improved with a simple configuration. And so on.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a golf cart according to an embodiment of the present invention.

FIG. 2 is a block diagram of the same.

FIG. 3 is a circuit diagram of the electromagnetic brake instruction circuit.

[Explanation of symbols]

 4 Drive motor 1 Drive wheel 5 Electromagnetic brake 9 Accelerator 14 Accelerator circuit 10 Mode changeover switch 7 Handle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60L 15/00 B60L 7/00

Claims (3)

(57) [Claims] A drive wheel driven by a drive motor, an electromagnetic brake for stopping rotation of the drive motor, accelerator means for varying the number of rotations of the drive motor, and an operation amount of the accelerator means A mode changeover switch having an electric mode in which the drive motor speed can be varied and a manual mode in which the drive motor is not energized, wherein the mode changeover switch selects the manual mode
The electromagnetic brake activates the accelerator means .
Electric vehicle, characterized in that the released by the operation. 2. The electric vehicle according to claim 1, wherein the mode changeover switch selects an electric mode.
When the electromagnetic brake is selected, the accelerator
A contract which is released by operating a step
The electric vehicle according to claim 1. Accelerator position wherein the accelerator means, according to claim 1 and 2 electric vehicle, wherein the wearing to the handle for indicating the direction of travel.