Electric commercial vehicle brake energy recovery system and control method

Abstract

The invention belongs to the field of vehicle brake, and particularly relates to an electric commercial vehicle brake energy recovery system and a control method. The system comprises a control systemand a pneumatic brake system, the control system comprises a brake controller, a brake bridge valve controller, a motor controller and a motor, and the pneumatic brake system comprises a brake pedal,a high-pressure air storage barrel, a front brake axle valve, a rear brake axle valve, a front wheel brake cylinder and a rear wheel brake cylinder; the brake controller comprises a communication module and a brake force distribution module, the brake bridge valve controller comprises a pressure acquisition module, a control module and a driving module, and the air brake bridge valve comprises anair pressure combination valve, a left brake air path and a right brake air path. The method comprises the steps of obtaining the current vehicle information through a vehicle-mounted CAN bus and a vehicle-mounted sensor; judging the participation condition of a brake source in the current scene; and the brake controller formulating a brake strategy according to the vehicle state and the brake pedal information. According to the scheme provided by the invention, the coordination control method of the air pressure brake and the electric brake of the electric vehicle under the conventional brake working condition is comprehensively considered, so that the brake force distribution is more reasonable.

Description

technical field [0001] The invention belongs to the field of vehicle braking control, and in particular relates to a braking energy recovery system and a control method of an electric commercial vehicle. Background technique [0002] With the intensification of environmental pollution and the increasing shortage of fossil energy around the world, the technical research and application of electric vehicles is of great significance. In the era of fuel vehicles, the braking force of the vehicle can only be provided by the mechanical braking system, and a lot of energy will be wasted when braking. [0003] In the application of electric vehicles or hybrid vehicles, since the motor can output both positive and negative torques, the motor can participate in the braking process of the vehicle by outputting a reverse torque. And when the motor of the electric vehicle participates in braking, the recovered energy will be stored in the battery in the form of electric energy, thereby ...

AI Technical Summary

Problems solved by technology

[0004] The existing braking energy recovery control strategy scheme generally adopts a simple parallel superposition strategy, which has a low degree of motor braking participation, resulting in low energy recovery efficiency, and does not consider the vehicle work during the vehicle braking process. The condition of the battery and the working state of the battery also lead to unreasonable distribution of braking torque, which greatly restricts the braking performance of the car and brings certain safety hazards to the car.

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