Air and regenerative brake coordination control system of hybrid electric bus

Abstract

The invention relates to an air and regenerative brake coordination control system of a hybrid electric bus, belonging to the technical field of hybrid electric buses. The system comprises a regenerative brake control subsystem and an air brake control subsystem, and is provided with a brake pedal displacement sensor, two normally open solenoid valves and two pressure sensors; wherein, the brake pedal displacement sensor is used for measuring the opening of the brake pedal; the two normally open solenoid valves are used for adjusting braking force distribution of front and rear shafts; the two pressure sensors are used for measuring the air brake pressure in front and rear brake pipelines. The coordination control system calculates the achievable brake strength and required brake torque based on the pedal displacement sensor, distributes the front and rear braking forces based on the brake strength and adjusts the motor output torque and air brake torque according to the current braking force distribution coefficient; the control error of the motor is dynamically compensated by the air braking force. The system farthest gives the regenerative brake function of the motor into play on the basis of ensuring the braking security and ride comfort of vehicles and improves the vehicle energy utilization factor and economy.

Description

technical field [0001] The invention belongs to the technical field of hybrid electric vehicles, and in particular relates to a coordinated control system of air pressure and regenerative braking. Background technique [0002] After retrieval, the following eight patent applications are related to the present invention. [0003] One is the "vehicle brake control system" of Nissan Automobile Co., Ltd., and the patent application number is 200320128501. The braking control system involved in this patent mainly has a braking mode selection part. Different braking methods have different control method priorities. [0004] The second is the "Control Method for Improving Braking Energy Recovery of Hybrid Electric Vehicles" by China FAW Group Corporation, the application number is 200510016977. This patent only controls the clutch to disconnect the engine from the drive train through the vehicle controller when the accelerator pedal is closed, and at the same time instructs the ...

AI Technical Summary

Problems solved by technology

This patent adjusts the hydraulic braking torque by calculating the maximum regenerative braking torque to meet the target active torque. It is applicable to hybrid cars and does not involve coordinated control with the anti-lock braking system.

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