Automatic detection method and device for a switch and a switch circuit

Abstract

The invention relates to the technical field of vehicle circuit detection, in particular to a switch and an automatic detection method for a switch circuit. It includes the following steps: S1, when the touch switch is detected, the two pins of the voltage dividing resistor R1 are respectively associated with the two pins of the switch; S2, the INT pin is connected to the MCU and generates a high and low level interrupt change; S3, the MCU The state of the switch is judged by the voltage of the AD pin before and during the detection of the switch. The embodiment of the present invention provides an automatic detection method, which compares and analyzes the AD pin voltage before and during the switch detection and the AD pin voltage before and during the switch detection in a normal state to determine the state of the switch; it can automatically detect the switch failure or Switch circuit faults, improve fault detection efficiency.

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 test 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. , all are required to be detected, which is convenient for technicians to quickly and accurately locate faults and carry out maintenance. [0003] At present, the common detection technology can detect the failure of the switch. However, it is difficult to automatically identify the contact resistance of the internal contacts of the switch, liquid entering, etc., etc.; If it can be identified, the cost of adding an additional identification line is high; in addit...

AI Technical Summary

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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