Method for precisely controlling braking pressure of braking energy recovery system for electric car

Abstract

The invention relates to a method of precisely controlling braking pressure of a wheel cylinder, in particular to a method for precisely controlling braking pressure of a braking energy recovery system for an electric car. The method is characterized by coordination between regenerative braking and hydraulic braking of a pure electric car and includes the steps of determining operation states and operation time of an oil inlet valve, an oil outlet valve and a hydraulic motor pump. Operation states and operation time of the oil inlet valve, the oil outlet valve and the hydraulic motor pump are determined effectively, and coordination with motor braking force is achieved.

Description

technical field [0001] The invention relates to a method for precisely controlling the braking pressure of a braking energy recovery system of an electric vehicle, and belongs to the technical field of the braking energy recovery system of an electric vehicle. Background technique [0002] At present, all electric vehicles adopt a braking energy recovery system, which uses the power generation function of the motor to recover the energy lost in the braking process, so as to achieve the purpose of energy saving and environmental protection. In the braking energy recovery system, the coordinated control of the motor braking force and the hydraulic braking force is one of the key technologies. Using the characteristics of precise and adjustable hydraulic braking force, the motor braking force is mainly used to maximize the regenerative braking capacity of the motor. , so as to recover as much braking energy as possible. In the process of cooperating with the braking force of t...

AI Technical Summary

Problems solved by technology

At present, part of the braking energy recovery system adopts an independent control mode, does not adjust the hydraulic braking force, and only directly superimposes the braking force of the motor, the energy recovery effect is poor, and the braking feeling is not good; another part of the braking energy recovery system adopts coordinated The control method has high requirements for the control accuracy of the hydraulic braking force

However, the current control method cannot accurately control the hydraulic braking force, so it cannot match the real-time changes of the motor, the energy recovery effect is not good, and the braking feeling is poor.

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