A method for adaptive sliding control of pure electric drive vehicles

Abstract

The invention discloses a self-adaptive slipping control method of a pure electrically driven automobile. A system of the automobile comprises a whole automobile controller, a motor, a motor controller, a power battery and a power battery controller. The whole automobile controller is responsible for upper-layer coordination control and is used for sending an instruction to the motor controller and receiving signals uploaded by the motor controller and the power battery controller. The self-adaptive slipping control method can keep the original driving feeling of the automobile without change of driving habits of a driver, can achieve automatic control according to automobile state parameters and the operation of the driver, can make the automobile slide at stable speed under the slope condition and can reduce the fatigue degree of the driver. By the adoption of the self-adaptive slipping control method, the brake pedal treading times executed by the driver can be decreased, and the probability of heat fade occurrence of a brake is effectively reduced. Maximized recovery of automobile brake energy under the slope condition can be achieved, and the economical efficiency of the whole automobile is improved. The self-adaptive slipping control method sets exit conditions when an electrically charged state SOC of the power battery is too high for power battery protection.

Description

technical field [0001] The invention relates to an intelligent control technology of an electric vehicle, in particular to an adaptive sliding control method of a pure electric drive vehicle. Background technique [0002] Electric vehicles currently on the market use the braking torque generated by the motor to simulate the anti-drag braking torque of the engine in the coasting state, and at the same time recover the braking energy. Among them, the BMW i3 considers the safety of the ramp conditions, and adjusts the braking torque of the motor to a larger value when the vehicle is coasting, so that the driver can maintain a stable speed on the ramp. Tesla also considered the above problems, and set a switch between the standard recovery mode and the strong recovery mode. The motor braking torque in the standard recovery mode is simulating the anti-drag braking torque of the engine, which is used for road construction coasting under the condition; under the strong recovery mo...

AI Technical Summary

Problems solved by technology

[0003] Since the motor braking torque of the BMW i3 cannot be adjusted when coasting, the brake deceleration is very large when the vehicle is coasting on flat roads, which will cause changes in driving experience and force the driver to change driving habits; The braking torque of the motor during coasting can be adjusted, but the driver needs to manually select the recovery mode, which increases the driver's workload and easily leads to driving fatigue; in addition, the motors of BMW i3 and Tesla in strong recovery mode The braking torque is set in advance, and the driver cannot adjust the braking torque in real time according to the size of the slope. When the vehicle is sliding on the slope, if the driver wants to keep the vehicle speed stable, he still needs to press the accelerator pedal or the brake pedal. operation, i.e. the technology still does not reduce the driver's workload

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