JPH04185210A - Speed controller of electric automobile - Google Patents

Abstract

PURPOSE:To accelerate and decelerate with an acceleration actuator only and give a satisfactory actuation feeling to a driver while an automobile is running down a slope by a method wherein both a driving PWM signal and a regenerative braking PWM signal are outputted from the actuation stroke of the acceleration actuator. CONSTITUTION:A speed controller 1 outputs a speed control output 103 in accordance with a speed command value 101 from an acceleration actuator and an actual speed 102. The speed control output 103 is inputted to a comparator 4 which outputs a mode switching signal 106 to a motor driving control circuit 7. The speed control output 103 is also compared with a driving sawtooth wave 104 and a regenerative braking sawtooth wave 105 by comparators 5 and 6 which output a driving PWM output 107 and a regenerative braking PWM output 108 to the motor driving control circuit 7 respectively. The motor driving control circuit 7 outputs motor control commands in accordance with the mode switching signal 106, the driving PWM signal 107 and the regenerative braking PWM signal 108.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a speed control device for an electric vehicle.

[Prior Art] In conventional control devices, motor drive control is performed by an accelerator operator, and regenerative braking control is performed by preliminary brake operation. In other words, the action equivalent to engine braking by returning the accelerator operator was not sufficient.

[Problem to be solved by the invention] Like a car using an internal combustion engine, acceleration and deceleration can be performed using only the accelerator pedal. The purpose is to provide a sense of operation.

[Means for solving the problem] A motor drive control circuit having a drive mode controlled by a PWM signal and a regenerative braking mode controlled by a PWM signal, a device that converts vehicle speed into an electric signal, and an accelerator operator. In an electric vehicle equipped with a device that converts a speed command into an electric signal, and a speed controller that outputs a speed control value from the speed command value and vehicle speed, It is equipped with one comparator for distinguishing the regenerative braking angle mode, two comparators for PWM, and one or two side wave oscillators, and the output of the aforementioned speed controller, that is, the accelerator operator. It is characterized by outputting control signals for both a driving PWM signal and a regenerative braking PWM signal from the manipulated variable.

[Operations] First, the speed controller determines acceleration and deceleration by comparing the speed command value and the vehicle speed, and outputs the results.

In this case, since short-period speed fluctuations are not a problem, it is preferable to keep the proportional control gain of the speed controller as low as possible.

Next, a threshold for distinguishing between drive and regenerative braking is determined for the output of the speed controller, and by comparing this threshold with the output of the speed controller, the drive mode of the motor drive control circuit is determined. A mode switching signal is created to switch between the regenerative braking mode and the regenerative braking mode.

Furthermore, the sound wave amplitude voltage ranges for PWM conversion for driving and regenerative braking are adjusted so that they oscillate above and below the threshold that distinguishes between driving and regenerative braking so that they do not overlap. By comparing the outputs of the two sonic speed controllers for PWM conversion using comparators, two PWM outputs for driving and regenerative braking are obtained.

Here, when the output of the speed controller is near the threshold for driving/regenerative braking mode switching, that is, the output of the speed controller is between the amplitude range of the driving copper wave and the amplitude range of the regenerative braking copper wave. If there is, neither the driving PWM output nor the regenerative braking PWM output is output.

The motor drive control circuit drives the motor, performs regenerative braking, and controls the speed using a total of three signals: the mode switching signal, driving PWM output, and regenerative braking PWM output.

[Example] The first ffl is a block diagram showing the configuration of the present invention.

A speed controller 1 receives a speed command value 10 from an accelerator operator.
1 and the actual vehicle speed 102, a speed control output 103 is outputted by PI sub-control. In this case, since short-period speed fluctuations are not dealt with by switching between drive and regenerative braking, it is preferable that the proportional control gain of the speed-side flJ device 1 be as low as possible.

The speed control output 103 output from the speed controller 1 first enters the comparator 4, where it is compared with a threshold value 109 that distinguishes between drive and regenerative braking angle modes, and then sent to the motor drive control circuit as a mode switching signal 106. 7 is input.

At the same time, the speed control output 103 includes a driving copper wave 104 and a regenerative braking copper wave 10 output by the side wave oscillator 2.3.
5 are compared by a comparator 5.6, and a drive PWM output 107 and a regenerative braking PWM output 108 are output to the motor drive control circuit 7.

In the motor drive control circuit 7, the mode switching signal 106
is in the drive mode, the motor is commanded to drive according to the drive PWM signal 107, and the mode switching signal 106
is in regenerative braking mode, regenerative braking PWM signal 108
The motor is commanded to perform regenerative braking accordingly.

FIG. 2 shows the mutual relationship of each signal in the present invention. In Fig. 2, 109 is a threshold voltage for distinguishing between driving and regenerative braking, 103 is the output voltage of the speed controller, and 1
04 and 105 represent the sonic force voltage for PWM conversion for driving and regenerative braking, respectively.

By comparing the speed control output 103 with a threshold voltage 109 that distinguishes between driving and regenerative braking, a mode switching signal 106 that switches between the driving mode and the regenerative braking mode is generated between the speed control output 103 and the driving PWM conversion saw. By comparison with the wave silver wave 4, the driving PWM output 107 is the speed control output 1.
03 and the regenerative braking PWM conversion side wave 105, a regenerative braking PWM output 108 is obtained.

Here, when creating the drive PWM signal and the regenerative braking PWM signal, the frequency, amplitude, and offset of each side wave may be changed as convenient for the motor drive control circuit. Further, the output of one sawtooth oscillator may be amplified and distributed by changing the gain and offset.

[Effects of the Invention] According to the present invention, it becomes possible to accelerate and decelerate only with the accelerator operator, like a car using an internal combustion engine, and it is possible to drive an electric car on roads including downhill slopes. When driving, it is possible to give the driver a good operational feeling.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the present invention. Figure 2 is a timing chart of major signals. 1. Speed controller 2.3. Sawtooth oscillator 4.5.6, comparator 7, motor drive control circuit 8, motor 101, speed command value 102, vehicle speed 103, speed control output] 06. Drive, regenerative braking mode switching signal 107, drive PWM output 108, regenerative braking PWM output 109, drive, regenerative braking threshold or above Applicant Seiko Epson Corporation Agent Patent attorney Kizobe Suzuki and 1 other person Figure 2

Claims (1)

[Claims] A motor drive control circuit having a drive mode controlled by a pulse width modulation signal and a regenerative braking mode controlled by a pulse width modulation signal, a device for converting vehicle speed into an electric signal, and an accelerator operation. In an electric vehicle equipped with a device that converts a child's speed command into an electric signal, and a speed controller that outputs a speed control value from the speed command value and vehicle speed, , one comparator to distinguish between both regenerative braking modes, and pulse width modulation (
Two comparators for performing PWM (hereinafter referred to as PWM), and one
or two sawtooth wave oscillators, and outputs control signals for both a driving PWM signal and a regenerative braking PWM signal from the output of the speed controller, that is, the operation amount of the accelerator operator. Electric vehicle speed control device.