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At present, many manufacturers still adopt the traditional analog test method when testing the combination switch . In this way, it is easy to cause missing and misdetection of individual gears, and the detection efficiency is also low. Recently, a new type of switchgear for automotive electrical appliances based on AT89S52 came out and solved these problems.
It is understood that the new combination switch can accurately detect all the gears of the combination switch and set the sound and light alarm functions to effectively prevent the false detection and individual gear missing detection in the simulation test.
The detection device adopts AT89S52, which is a common market, as the MCU. The chip has simple programming, convenient program downloading, and high cost performance, and is widely applied in the field of industrial control. The detection device sets a qualified indicator of ten gears and an overall qualified indicator for a certain type of combination switch. When all ten gears pass the test, the overall qualified indicator lights up. In addition, in order to focus workers' attention on preventing misjudgments, an overall qualified sound alarm is also set up, and an alarm is issued through voice while the overall qualified indicator is on.
Combination switch detection is a very important part of production, generally using analog detection methods, that is, all the peripheral circuits of the combination switch are installed on the test bench, and the working status of each gear is simulated with the indicator light, such as the combination switch is pulled to Intermittent gear, the indicator should flash intermittently. This kind of detection method has high requirements for workers and it is very easy to cause misdetection and missed detection. The combination switch detection device designed and manufactured by the author uses a single-chip scanning detection program, adding sound and light alarms, reducing the labor intensity of workers, effectively preventing misdetection and missed detection, especially suitable for production site use.
At the same time, the detection device judges whether the switch is good or bad by means of point-to-point scanning of each position of the combination switch, and at the same time, it can also detect whether the internal wiring of the combination switch is correct and whether there is a short circuit between each lead. At the same time, in order to improve the test efficiency, it also adds an automatic test function. When the combination switch is taken, the system automatically resets, and the system automatically starts testing after the next combination switch to be tested is placed.
Extensive reading:
The automotive combination switch is in the electrical control circuit, a switch often used as a power source, which can be used to directly start or stop a low-power motor or to make a motor reversing. The automotive electrical appliance switch is a device that is installed on the steering column of the automobile and consists of more than two switches for controlling the lights, signals, and operating electrical appliances of the automobile.
Analysis of new product of switchgear of automobile combination electric appliance