An electromechanical fault diagnosis method for an electronic parking brake system

Abstract

The invention discloses a method for diagnosing electromechanical faults of an electronic parking brake system. It includes the following steps: when the electronic parking brake system is working, the voltage sensor collects the voltage V of the motor, the current sensor collects the current I of the motor, obtains the actual current curve I(t), and calculates different time points according to the actual current curve I(t). The displacement sensor detects the theoretical displacement S0 of friction plate movement, and obtains the theoretical displacement curve S0(t). The control chip reads the pre-stored standard current curve I0(t), calculates the error eI between the actual current I and the standard current I0, and passes the displacement sensor Detect the actual displacement S of the friction plate, calculate the error eS between the actual displacement S and the theoretical displacement S0, if ei / eith>1 or eS / eith>1, it is judged that the electronic parking brake system is faulty. The invention can effectively detect whether an electromechanical failure occurs in the electronic parking brake system, and improves the reliability of the electronic parking brake system.

Description

technical field [0001] The invention relates to the technical field of automobile fault diagnosis, in particular to an electromechanical fault diagnosis method for an electronic parking brake system. Background technique [0002] In the electronic parking brake system, the reliability of the electromechanical system is a difficult point in the design of the entire system, and it is also one of the obstacles encountered in the promotion of the electronic parking brake system. At present, there is no effective method that can quickly and accurately detect whether an electromechanical failure occurs in the electronic parking brake system. [0003] Chinese Patent Publication No. CN103419771, published on December 4, 2013, the name of the invention is an electronic parking brake system and a method for indicating a failure of a parking brake switch. The application discloses a method for indicating a failure of a parking brake switch , which includes determining whether a parkin...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the technical problem that the electronic parking brake system cannot effectively detect the electromechanical fault at present, and provides a method for diagnosing the electromechanical fault of the electronic parking brake system, which can effectively detect whether the electronic parking brake system is In the event of electromechanical failure, the reliability of the electronic parking brake system is improved and the occurrence of accidents is reduced

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