Switch and automatic detection method and device of switch line

Abstract

The invention relates to the technical field of vehicle circuit detection and particularly relates to a switch and an automatic detection method of a switch circuit. The method comprises the followingsteps that: (S1) when a touch switch is detected, two pins of a divider resistor R1 are respectively associated with two pins of the switch, (S2) an INT pin is connected to a MCU and high-low level interruption change is generated, and (S3) the MCU judges the state of the switch according to AD pin voltage before and during detection of the switch. According to the automatic detection method provided by the embodiment of the invention, the state of the switch is judged by comparing and analyzing the AD pin voltage before and during the switch detection and AD pin voltage before and during theswitch detection in a normal state, switch faults or switch line faults can be automatically detected, and the fault detection efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of vehicle circuit detection, in particular to a switch and an automatic detection method and device for a switch circuit. Background technique [0002] In order to ensure the safety of vehicle driving, whether it is a two-wheeled vehicle or a four-wheeled vehicle, it is necessary to detect each switch and the entire switch circuit to detect whether the switch fails, or when the switch fails, it is the cause of the switch failure or the line failure. , are required to be detected, so that technicians can quickly and accurately locate the fault and carry out maintenance. [0003] At present, the common detection technology can detect the failure of the switch, but it is not easy to automatically identify the internal contact resistance of the switch, the liquid, etc.; at the same time, it cannot automatically identify whether the circuit is damaged or the switch is faulty; that is If it can be identified, th...

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Problems solved by technology

[0003] At present, the common detection technology can detect the failure of the switch, but it is not easy to automatically identify the internal contact resistance of the switch, the liquid, etc.; at the same time, it cannot automatically identify whether the circuit is damaged or the switch is faulty; that is If it can be identified, the cost of adding an additional identification line is high; in addition, the common method of identifying whether the switch is good or bad can also be identified by the principle of AD conversion, but it takes up a lot of CPU time and cannot respond to the switch action information in a timely manner.

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