Electric vacuum servo device control strategy of electric car brake

Abstract

The invention discloses an electric vacuum servo device control strategy of an electric car brake. The control strategy comprises the following steps: a vacuum pump control unit is used to control the on / off of a vacuum pump according to the collected signal of a vacuum pressure switch arranged on a vacuum tank and the output signal of a brake switch connected with a brake pedal or a pedal opening sensor, and the vacuum pump control unit is used to perform systematic failure diagnosis according to the output signal of the brake switch or the pedal opening sensor, the signal of the vacuum pressure switch and the operation time of the vacuum pump. By adopting the method of the invention, the problems of large energy consumption of the vacuum pump and poor system reliability can be solved.

Description

technical field [0001] The invention relates to a control strategy for an electric vehicle brake electric vacuum booster, in particular to a control strategy for an electric vehicle brake electric vacuum booster with a vacuum pressure switch. Background technique [0002] Driven by national policies, financial support and technology, electric vehicles (especially pure electric vehicles) have developed rapidly. The vast majority of cars use a vacuum booster braking system. The vacuum source of the vacuum booster device in the traditional internal combustion engine vehicle braking system comes from the engine intake manifold, while pure electric vehicles or electric vehicles with pure electric working conditions have no engine For the vacuum power source of the air manifold, the braking force generated by manpower alone cannot meet the needs of vehicle braking. Therefore, it is necessary to have an electric vacuum booster to assist manpower in vehicle braking. [0003] At pre...

AI Technical Summary

Problems solved by technology

The vast majority of cars use a vacuum booster braking system. The vacuum source of the vacuum booster device in the traditional internal combustion engine vehicle braking system comes from the engine intake manifold, while pure electric vehicles or electric vehicles with pure electric working conditions have no engine The vacuum power source of the air manifold, the braking force generated by manpower alone cannot meet the needs of vehicle braking, so it is necessary to have an electric vacuum booster to assist manpower in vehicle braking

[0003] At present, many electric vehicles use electric vacuum pumps to evacuate continuously. Although this can achieve brake boosting, it consumes too much energy, increases the noise of the system, and causes premature loss of vacuum pumps.

There are also some systems that use a vacuum pressure switch or a vacuum pressure sensor to control the start or stop of the vacuum pump, but they are simply controlled according to the on-off of the vacuum pressure switch, and there is no diagnostic function, which has potential safety hazards in many aspects.

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