Braking vacuum servo force system and braking vacuum servo force control method

Abstract

The invention provides a braking vacuum servo force system and a braking vacuum servo force control method; a main ECU (12) is used for receiving electric signals expressing the magnitude of atmospheric pressure value and outputting control signals for controlling a vacuum pump (6) through a main control loop according to the electric signals, and a slave ECU (17) is used for replacing the main ECU (12) for receiving the electric signals expressing the magnitude of the atmospheric pressure and outputting control signals for controlling the vacuum pump (6) through a slave control loop accordingto the electric signals, when one of the main ECU (12) and the main control loop is in an abnormal state. The braking vacuum servo force system and the braking vacuum servo force control method in the invention avoid the problem of the out of control vacuum pump when the main ECU (12) and / or the main control loop are / is invalid, thus enhancing reliability and effectiveness of braking servo and ensuring safety of drivers to the utmost.

Description

technical field [0001] The invention relates to an automobile brake system, in particular to a brake vacuum booster system and a brake vacuum booster control method. Background technique [0002] At present, automobiles are basically equipped with brake boosters, especially the use of brake vacuum boosters is very popular. The principle is to use the pressure difference between the negative pressure generated when the engine is working and the atmospheric pressure to force the rubber diaphragm in the brake vacuum booster to move and push the piston of the brake master cylinder, thereby reducing the force of people stepping on the brake pedal. [0003] Traditional fuel vehicles mainly use the rotation of the engine to continuously pump the vacuum to ensure a certain amount of brake power, and the operation method is more sensitive. In existing electric vehicles, the engine has been replaced by an electric motor, and the engine in a hybrid vehicle does not work all the time, ...

AI Technical Summary

Problems solved by technology

However, under abnormal circumstances, such as the failure of the main control ECU, the brake booster cannot be controlled, so the reliability and effectiveness of the brake vacuum booster system cannot be fully realized, and the safety of drivers cannot be guaranteed to the maximum extent.

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