Based on the battery voltage signal detection engine starting process

Automobile engine starting process of automatic detection is a research engine automatically start and extinction of the key. This paper according to the engine start-up battery voltage variation curve feature, through the inspection engine starting process voltage signal change, use of operational amplifier road 4 comparator will battery voltage and standard VCC + 5 V voltage comparison, judge whether engine start-up success. The method is simple, direct and effective characteristics, to realize the automatic startup system the research provide reliable way.