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Nowadays, natural gas conforms to the conditions of environmental protection and renewable energy, which
plays a significant role in the future development of mankind. It has made some progress in applying natural gas to the
automotive industry. As we all know that the source power of automobile comes from engine, therefore, based on the
study 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 corresponding
controllers based on the algorithm principles, applied these three algorithms to the idle control process of the
automobile gas engine. This paper concluded that the fuzzy PID control algorithm is of higher superiority through contrastive
analysis on the control effects of theses three algorithm in the process of cooling high idle start, switching high
idle to low idle and switching low idle to high idle.