Precursor electric automobile regenerative braking and ABS matching control method

Abstract

The invention relates to the technical field of electric automobiles, in particular to a precursor electric automobile regenerative braking and ABS matching control method. A controller determines the strength of braking, then whether the braking is emergency braking or not is judged according to the electric liquid composite braking strategy, and if the braking is the emergency braking, an ABS is started directly; if the braking is not the emergency braking, the braking force of a front axle of an automobile and the braking force of a rear axle of the automobile are determined, and the friction braking force of the front axle, the friction braking force of the rear axle and the regenerative braking force of the front axle are determined by combining the maximum regenerative braking force; when it is detected that front wheels arrive at the optimal slip rate, the ABS is started, the regenerative braking force is kept to be constant, the pressure of a wheel braking cylinder is adjusted, the wheel slip rate is controlled to be at the optimal value, and locking of the wheels is avoided; when it is detected that rear wheels are in a locking trend, and the rear wheel slip rate is controlled by using a traditional ABS. According to the method, a regenerative braking system and the ABS are combined to conduct comprehensive control, a part of braking energy can be recycled, the economical efficiency can be improved, and the automobile can obtain better braking performance.

Description

technical field [0001] The invention relates to the technical field of electric vehicles, in particular to a matching control method for regenerative braking and ABS of a front-drive electric vehicle. Background technique [0002] In recent years, electric vehicles have attracted attention from all walks of life due to their advantages of low energy consumption and zero emissions. Some enterprises and scientific research institutions are also vigorously researching electric vehicles under the guidance of government policies. [0003] Braking energy recovery technology is an important means of energy saving for electric vehicles. The motor has two working states: the state of the driving motor and the state of the generating motor. When the motor is running in the power generation state, it can not only generate braking torque to the shaft to decelerate the car, but also convert part of the braking energy of the car into electrical energy to charge the power battery, thereby ...

AI Technical Summary

Problems solved by technology

However, since the regenerative braking force acts on the driving wheels, its addition will inevitably increase the value of the braking force distribution ratio β, which will increase the possibility of the front wheels tending to lock, and the application of the rear wheel braking force will be insufficient.

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