Nowadays, natural gas conforms to the conditions of environmental protection and renewable energy, whichplays a significant role in the future development of mankind. It has made some progress in applying natural gas to theautomotive industry. As we all know that the source power of automobile comes from engine, therefore, based on thestudy on the control algorithm of gas engine, this paper aims to provide theoretical basis for further application of gas engine.This paper analyzed PID control algorithm, fuzzy control algorithm and fuzzy PID control algorithm, designed correspondingcontrollers based on the algorithm principles, applied these three algorithms to the idle control process of theautomobile gas engine. This paper concluded that the fuzzy PID control algorithm is of higher superiority through contrastiveanalysis on the control effects of theses three algorithm in the process of cooling high idle start, switching highidle to low idle and switching low idle to high idle.
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