A control system and control method for electric vehicle ramp parking

Abstract

The invention provides a control system and control method for parking an electric vehicle on a slope. The system includes a brake anti-lock brake system, a hand brake, a gear switch, an accelerator pedal, a brake pedal, a vehicle controller, and a motor control system. device and drive motor; the brake anti-lock braking system, hand brake, gear switch, accelerator pedal, brake pedal and motor controller are respectively used to detect the vehicle speed signal, handbrake signal, gear signal, accelerator pedal signal, The brake pedal signal, and the temperature and speed signals of the drive motor are sent to the vehicle controller respectively, and the vehicle controller controls whether the vehicle enters the ramp parking state. The invention can greatly improve the reliability and safety of the control system.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control systems, in particular to a control system and control method for parking an electric vehicle on a slope. Background technique [0002] At present, the ramp parking function of electric vehicles is mainly realized by its control system. The system mainly includes a shift handle signal acquisition device, an accelerator pedal signal acquisition device, a brake pedal signal acquisition device, a vehicle controller, a motor controller, a motor , and motor speed detection device. The shift handle, accelerator pedal and brake pedal signal acquisition device are connected to the vehicle controller through a low-voltage wiring harness, the motor controller is connected to the vehicle controller through a CAN bus, the motor speed detection device and the motor are mechanically installed and fixed, and the motor control The controller and the motor are connected through a high-voltage wir...

AI Technical Summary

Problems solved by technology

[0004] (1) The control system of the prior art solution lacks a cooling system for auxiliary heat dissipation, especially when the vehicle is heavily loaded and the slope is large, affected by the gravity and the slope, the gravity component of the vehicle parallel to the slope will increase. Larger, if only the motor is used to park on a slope and maintain the static state of the vehicle, the required motor drive force and motor input current will be greater; but at this time, because the motor is in a locked-rotor state, the electrical energy input by the motor cannot be converted into mechanical energy , and most of them are converted into the heat energy of the motor, which will cause the motor to continue to heat up. At the same time, due to the increase in the input current of the motor, it will also cause the power unit inside the motor controller to continue to heat up; due to the lack of auxiliary cooling system, the motor or The motor controller may fail or be damaged due to continuous heating or even overheating, which reduces or disappears the driving force of the motor and causes the risk of vehicle loss of control

[0005] (2) In the control system of the prior art scheme, once the motor, the motor speed sensor or the motor controller fail, the driving force of the motor will be reduced or disappeared, thereby causing the failure of the motor ramp parking function, or even due to a sudden The failure or loss of control can cause danger

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