Braking energy recovery control method and system based on braking efficiency consistency

Abstract

The invention relates to a braking energy recovery control method based on braking efficiency consistency. The method includes the steps that before braking starts, the current road adhesion coefficient is recognized; a braking efficiency reference sample function under the current road adhesion coefficient is determined; when braking starts, brake pedal position information from a brake pedal opening degree sensor is received, and the current brake pedal opening degree and the current automobile speed are judged; whether the next step that braking energy recovery is started is executed or notis judged, and if a judgment result is negative, a conventional hydraulic braking measure is taken; and braking energy is recovered. The invention further discloses a braking energy recovery controlsystem based on braking efficiency consistency. Which adhesion coefficient the road surface has is judged and matched through a road surface recognition and comparison module, and ABS control can be optimized; and the braking intention of a driver is recognized through the brake pedal opening degree sensor, and on the premise that automobile active safety is guaranteed, the braking energy is recovered.

Description

technical field [0001] The invention relates to the technical field of electric vehicle energy recovery, in particular to a braking energy recovery control method and system based on braking efficiency consistency. Background technique [0002] With the intensification of energy problems and environmental pollution problems, the research and application of electric vehicles is of great significance. In today's energy recovery control methods, there is often a contradiction between recovery efficiency and braking comfort, which is mainly reflected in the large discrepancy between the braking feeling and braking efficiency produced by the two when the braking energy recovery system is turned on and off. The driver cannot adapt well to these two different braking conditions. The root cause of this phenomenon is that the external characteristic curve of the motor is in a certain speed range, and there is a serious nonlinearity between the recovery torque and the speed. However,...

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Problems solved by technology

[0004] The primary purpose of the present invention is to provide a system that can not only solve the problem of inconsistent braking performance in the two braking conditions when the driver turns on and off the braking energy recovery system, but also can be used on roads with different adhesion coefficients. , to ensure relatively stable braking efficiency, give full play to the performance of ABS, improve the utilization rate of adhesion coefficient, and ensure the active safety of the vehicle. The braking energy recovery control method based on the consistency of braking efficiency

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