Electric vehicle regenerative braking force distribution method

Abstract

The invention relates to a regenerative braking force distribution method for an electric vehicle, and relates to the technical field of automobile industry. The main technical scheme includes the steps of acquiring a pressure value of a current brake master cylinder; acquiring, according to a pre-stored function relationship between the regenerative braking force of a front motor of the electricvehicle and the brake master cylinder pressure, a value of the corresponding regenerative braking force of the front motor to the pressure value of the current brake master cylinder; acquiring, according to a pre-stored function relationship between the regenerative braking force of a rear motor of the electric vehicle and the brake master cylinder pressure, a value of the corresponding regenerative braking force of the rear motor to the pressure value of the current brake master cylinder; and distributing a regenerative braking force on a front axle and a rear axle of the electric vehicle based on the value of the regenerative braking force of the front motor and the value of the regenerative braking force of the rear motor. The method achieves the rational distribution of the regenerative braking force of the front motor and the regenerative braking force of the rear motor.

Description

technical field [0001] The invention relates to the technical field of the automobile industry, in particular to a method for distributing regenerative braking force of an electric vehicle. Background technique [0002] The regenerative braking of electric vehicles is a braking method that uses the electrical braking of the motor to generate reverse torque to slow down or stop the vehicle. Then, the mechanical energy of the car is converted into electric energy to charge the battery through the reverse freewheeling diode of the inverter, and at the same time, the mechanical energy of the car is consumed to realize the braking of the car. [0003] For the regenerative braking system of electric vehicles, the energy recovery rate and occupant comfort are important evaluation indicators for evaluating the braking energy recovery system. At present, the regenerative braking system of pure electric vehicles generally divides the braking force distribution and energy recovery stra...

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Problems solved by technology

[0003] For the regenerative braking system of electric vehicles, the energy recovery rate and occupant comfort are important evaluation indicators for evaluating the braking energy recovery system. At present, the braking force distribution and energy recovery strategies of the regenerative braking system of pure electric vehicles are generally divided into series Two types: series regenerative braking system, when the driver does not operate the brake pedal or lightly steps on the brake pedal, the motor can generate regenerative braking force to decelerate the vehicle. This regenerative braking method can achieve higher However, the frequent deceleration caused by the regenerative braking force in actual driving will make the occupants feel uncomfortable and reduce the comfort of the ride; while the parallel regenerative braking system, only when the driver operates the brake Regenerative braking force is generated only when there is a subjective demand for braking on the pedal, that is, the total braking force of an electric vehicle is generated simultaneously by the traditional mechanical braking force and the regenerative braking force generated by the motor. The braking deceleration process is the same as the driving The driver's subjective needs are consistent, and the ride comfort is better, but because the regenerative braking force accounts for a relatively low proportion of the total braking force, the braking energy recovery rate is low

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