Based on LPG for the automotive alternative fuel,and according to the basic requriements of convenience,practicability and reliability,this paper designs a set of electronic control systems for LPG/gasoline dual fuel mode engine, explores the operation of the engine oil change process in detail, and brings out a set of switch strategy. ECU engine is able to fol ow commands, and the oil is converted into the gas under normal operation conditions, vice versa.%以LPG为汽车代用燃料，以方便性、实用性和可靠性为基本要求，设计出一套LPG-汽油双燃料模式发动机电控系统，详细探究了发动机运转中油气改变进程，提出了一套油气转换控制方案。发动机能够按照ECU的命令，在正常运转的状况下安稳地实行油气转换，使发动机相应单独运行在两种燃料形式下。
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