JP2002369317A - Constant speed traveling controller of motor vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constant speed traveling controller of a motor vehicle in which constant speed traveling can be realized through a simple operation and the output can be controlled so that a constant speed does not exceed a set speed even if the throttle is fully opened. SOLUTION: A motor vehicle comprising a motor for driving the vehicle, a vehicle controller for controlling the motor output and a battery is further provided with a vehicle speed detecting means, a means for detecting the number of revolutions of the motor, a motor current detecting means, a battery voltage detecting means, a battery current detecting means, and a speed setting means. Constant speed traveling is effected by setting a speed and controlling the motor current or the regenerative brake based on the vehicle speed and the number of revolutions of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant speed traveling control device for an electric vehicle.

[0002]

2. Description of the Related Art Generally, in an electric vehicle, a driver operates a throttle and supplies a current proportional to the throttle opening to a motor to drive the motor. I do. Therefore, the speed adjustment of the vehicle is performed by the driver operating the throttle based on the display of the speedometer.

[0003]

However, when traveling at a constant speed, the driver must operate the throttle while always paying attention to the speed while watching the speedometer. And get tired. In addition, even if the throttle is kept constant, the speed changes depending on the state of the terrain of the traveling road. For example, on a downhill or the like, the speed gradually increases even if the throttle is kept constant.

The present invention has been made in consideration of the above-mentioned prior art, and enables an electric vehicle to run at a constant speed with a simple operation, and that the speed does not exceed a certain set speed even when the throttle is fully opened. It is an object of the present invention to provide a constant-speed traveling control device for an electric vehicle that can control the output power.

[0005]

According to the present invention, there is provided an electric vehicle including a motor for driving a vehicle, a vehicle controller for controlling an output of the motor, and a battery. A motor speed detecting means, a motor current detecting means, and a speed setting means, and by setting the speed, the motor current is controlled based on the vehicle speed and the motor speed to perform a constant speed traveling. Provided is a constant-speed traveling control device for an electric vehicle.

According to this configuration, the vehicle controller automatically controls the motor current on the basis of the detected data of the vehicle speed and the motor rotation speed by a simple operation simply by setting the speed, and travels at a constant speed.

In a preferred configuration example, a battery voltage detecting means and a battery current detecting means are provided. The speed setting means sets a maximum speed, and controls a motor current and a regenerative brake based on a vehicle speed and a motor speed. It is characterized by running below the maximum speed.

According to this configuration, for example, on a long downhill or the like, by setting the maximum speed, the vehicle controller controls the motor current based on the detected data of the vehicle speed and the motor rotation speed and the regenerative brake control by controlling the regenerative current. To prevent overspeeding.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external view of a small electric scooter to which the present invention is applied.

The electric scooter 1 has a main frame 2 constituting a vehicle body. A front fork 4 is provided at a front portion of the main frame 2 through a head pipe 3. A front wheel 5 is mounted on the front fork 4. A swing arm 6 is swingably attached via a swing pivot 7 from the main frame 2 at the center of the vehicle body toward the rear. The swing arm 6 is integrated with a wheel motor unit 9 mounted on an axle 13 of the rear wheel 8 to form a drive unit 12. A wheel motor (not shown) and a transmission (not shown) serving as a power source for driving the vehicle are incorporated in the wheel motor unit 9. Wheel motor unit 9
Is connected to the lower end of the shock absorber 11 via the suspension pivot 10. The upper end of the shock absorber 11 is attached to the main frame 2 at the rear end of the vehicle body. Thereby, the rear wheel (drive wheel) 8 incorporating the wheel motor is swingably supported with respect to the main frame 2.

A shift operation switch 15 is provided at a grip base portion of a handle 14 for steering the front wheel 5 via the front fork 4. The shift operation switch 15 includes a shift changeover switch 28 (FIG. 2) for selecting one of a manual shift and a manual shift, and a shift-up switch 29 (FIG. 2) for shifting to a higher gear when the manual shift is selected. ) And a downshift switch 30 (FIG. 2) for shifting to a lower gear.

A vehicle speed sensor 16 is mounted on the axle of the front wheel 5. The battery 17 is located below the seat 19 in the center of the vehicle body.
Is stored. A vehicle controller 18 including a control circuit having a program for controlling a motor and a transmission is provided below the seat 19 at the rear of the vehicle body.

FIG. 2 is a configuration diagram of the electric vehicle according to the present invention. A vehicle speed sensor 16 is provided on the axle of the front wheel 5, a vehicle speed is displayed on a speedometer 20, and a vehicle speed signal is input to a vehicle controller 18. The vehicle controller 18 further includes a main switch 22 for turning on and off the motor 21 and various switches 2 such as a flasher and a horn.
3. The throttle 24 and the torque sensor 25 are connected. The switches 23 include a brake switch that is turned on when a brake is operated, a vehicle speed setting switch for setting a constant speed in the case of constant speed traveling control, and the like. The motor 21 is a wheel-in motor mounted in the hub of the rear wheel 8. The motor 21 is connected to a power module 26 including an inverter circuit for controlling output. The power module 26 includes the vehicle controller 1
8 may be incorporated.

The current signal of the motor 21 is input to the vehicle controller 18 via the power module 26. The motor 21 drives the vehicle via a transmission 27. The transmission 27 is automatically controlled by the vehicle controller 18 or manually controlled by the shift operation switch 15 (see FIG. 1). The shift operation switch 15 includes a shift switch 28, an upshift switch 29, and a downshift switch 30. The motor 21 is provided with an encoder 31 and the magnetic pole position signal is transmitted to the vehicle controller 18.
And the number of rotations of the motor is detected. Further, a motor temperature detection signal is input to the vehicle controller 18.

The vehicle is provided with a battery 32, which is discharged by an ON signal of the main switch 22 via a battery management controller 33 to drive the motor 21. The battery 32 can be charged by a vehicle-mounted or external charger 34. The battery 32 is provided with a cooling fan 35, which is controlled on / off by the vehicle controller 18.

FIG. 3 is a flowchart of the constant speed traveling control according to the embodiment of the present invention. This constant-speed running control is performed, for example, by a program incorporated in the vehicle controller.

Step S1: It is determined whether or not the vehicle runs at a constant speed. For example, ON / OFF of a constant speed traveling setting switch or the like is determined. Step S2: Determine the speed setting flag and confirm the driver's intention to drive at a constant speed. The flag is set, for example, when the driver inputs a specific set speed numerical value.

Step S3: It is determined whether the brake switch is on or off. The brake switch is mounted on a brake pedal or a brake lever, for example, and is automatically turned on when a brake operation is performed. Step S4: When the brake switch is ON, the speed setting flag is cleared, the constant speed traveling control is stopped, and normal traveling control is performed.

Step S5: The throttle opening is detected by the throttle sensor. Step S6: Based on the throttle opening detection data, a command value of a current supplied to the motor to obtain an output according to the driver's intention is calculated. Step S7: The motor is driven based on the current command value. Steps S <b> 5 to S <b> 7 are normal traveling control without performing the constant speed traveling control.

Step S8: The vehicle speed detected by the vehicle speed sensor is compared with the set speed in step S2. The constant speed traveling control is performed in the following steps S9 to S12 using the set speed as a target value.

Step S9: If the vehicle speed is lower than the set value in step S8, the current command value is increased by, for example, adding a certain unit amount. Step S10: The current command value added in step S9 is supplied to the motor to drive the motor. Thereby, the motor speed is increased to bring the vehicle speed lower than the set value closer to the set value.

Step S11: If the vehicle speed is equal to or higher than the set value in step S8, the current command value is reduced by, for example, subtracting a certain unit amount. Step S12: The current command value subtracted in step S11 is supplied to the motor to drive the motor. This allows
Decrease the motor speed to bring the vehicle speed higher than the set value closer to the set value.

In the present invention, it is also possible to set a maximum speed and control the vehicle to run at a speed lower than the set speed. For example, in long downhill traveling, the maximum speed is set and traveling control is performed in the same manner as in the flowchart of FIG. in this case,
By detecting the regenerative current generated from the motor and returning it to the battery according to the speed, the regenerative brake is actuated and the increase in speed can be suppressed. Such a regenerative brake control calculates a regenerative current amount to be returned to the battery by battery voltage and battery current detection data based on the vehicle speed, the motor rotation speed data and the regenerative current data by a control program in the vehicle controller. Can be controlled automatically.

Also, by setting the maximum speed, the vehicle can run without exceeding the set speed even when the vehicle is running with the throttle fully open, so that excessive speed can be prevented.

[0025]

As described above, according to the present invention, the vehicle controller automatically controls the motor current based on the detection data of the vehicle speed and the motor speed by a simple operation only by setting the speed. Since the vehicle runs at a constant speed, the driver can easily drive without burden.

[Brief description of the drawings]

FIG. 1 is an external view of an electric scooter according to the present invention.

FIG. 2 is a configuration diagram of a vehicle control device including the constant speed traveling device according to the present invention.

FIG. 3 is a flowchart showing the operation of the constant-speed traveling device according to the present invention.

[Explanation of symbols]

1: Electric scooter, 2: Main frame, 3: Head pipe, 4: Front fork, 5: Front wheel, 6: Swing arm, 7: Swing pivot, 8: Rear wheel, 9: Wheel motor unit, 10: Suspension pivot, 1
1: Shock absorber, 12: Drive unit, 13:
Axle, 14: steering wheel, 15: shift operation switch, 1
6: vehicle speed sensor, 17: battery, 18: vehicle controller, 19: seat, 20: speedometer, 21: motor, 22: main switch, 23: switches, 2
4: throttle, 25: torque sensor, 26: power module, 27: transmission, 28: transmission changeover switch,
29: shift up switch, 30: shift down switch, 31: encoder, 32: battery, 33: battery management controller, 34: charger, 35: cooling fan.

Claims (2)

[Claims] 1. An electric vehicle comprising a motor for driving a vehicle, a vehicle controller for controlling the output of the motor, and a battery, wherein a vehicle speed detecting means, a motor rotational speed detecting means, a motor current detecting means and a speed setting means are provided. A constant-speed traveling control device for an electric vehicle, comprising: setting a speed to control a motor current based on a vehicle speed and a motor speed to perform constant-speed traveling. 2. A vehicle comprising a battery voltage detecting means and a battery current detecting means, wherein a maximum speed is set by the speed setting means, and a motor current and a regenerative brake are controlled on the basis of a vehicle speed and a motor rotational speed to be lower than the maximum speed. The constant-speed traveling control device for an electric vehicle according to claim 1, wherein the traveling speed is controlled.