Based on the self-developed gasoline/CNG dual fuel electronic control unit of MC9S12XET256 SCM,the oxygen signal simulation and oxygen closed-loop control adaptive learning function were developed.The oxygen signal simulation could not only realize the lean burn and improve the fuel economy in high load and high speed,but also finish the injection MAP calibration of ECU through combining with the adaptive learning function.The closed-loop control and adaptive learning control of CNG realized the precise control of air/fuel ratio and the effect was verified on JAC 4GA1 engine and Jetta automobile.%在自行开发的基于MC9S12XET256单片机的汽油/CNG两用燃料电控系统的基础上,设计开发了氧仿真功能和基于开关氧闭环控制的燃气自学习功能.氧仿真功能一方面可以在发动机大负荷、高转速时实现稀燃,提高经济性,另一方面和自学习功能共同作用可以完成燃气ECU喷气MAP的标定.燃气闭环控制和自学习控制的共同作用,实现了对发动机空燃比更精确的控制,控制效果在江淮4GA1发动机台架和一汽捷达汽车上进行了验证.
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