System and method for identifying true braking using brake switch and brake master cylinder pressure

Abstract

The invention relates to a system and a method for recognizing real braking by using a brake switch and the pressure of a brake main cylinder. The method comprises the following steps of setting a variate initial value and then setting time in a delayed manner by using the system; judging whether signals of the brake switch are consistent to pressure signals of the main cylinder or not; outputting a sign which shows that brake signals are effective if the signals of the brake switch are consistent to the pressure signals of the main cylinder; monitoring fault of an engine if the signals of the brake switch are not consistent to the pressure signals of the main cylinder; and performing redundancy check according to information such as current accelerator information and speed information. Whether the brake signals are real or not is judged preliminarily by using two channels of brake signals and main cylinder pressure signals transmitted by an ESP (electronic stability program), redundancy check is performed according to the information such as the current accelerator information and the speed information, whether the brake signals are real or not can be accurately judged, once the brake signals are failed, a protecting measure can be taken for a whole automobile, so that risks are reduced, and the reliability of the brake signals is improved.

Description

technical field [0001] The invention belongs to the technical field of engine electronic control and chassis electronic control braking strategy design, and in particular relates to a system and method for identifying real braking. Background technique [0002] At present, vehicles at home and abroad only use a single hallCOUNTERC (Hall device) brake switch to identify the brake, such as figure 1 shown. Due to the risk of signal line short circuit and open circuit between the internal hallCOUNTERC (Hall sensor) and ASCOUNTERC (automotive integrated circuit) of the brake pedal switch, only a single hallCOUNTERC brake switch is used to identify many risks of braking, including: [0003] If the brake switch sensor fails, the cruise cannot be exited by braking, which may cause the vehicle to lose control; [0004] Failure of the brake switch sensor may lead to failure of the "brake priority" function; [0005] Sensors that are too sensitive may cause false triggering of the "...

AI Technical Summary

Problems solved by technology

[0003] If the brake switch sensor fails, the cruise cannot be exited by braking, which may cause the vehicle to lose control;

[0004] Failure of the brake switch sensor may lead to failure of the "brake priority" function;

[0005] Sensors that are too sensitive may cause false triggering of the "brake priority" function, affecting drivability

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