Development of control system for a CNG/gasoline bi-fuel engine
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摘要:
使用CNG (compressed natural gas)为主燃料汽油为辅助燃料的CNG/汽油两用燃料汽车具有良好的经济性和排放性能，传统的在用车改装采用主从式双ECU(electronic control unit)系统，性能不佳。通过对发动机燃烧和排放理论研究，开发了面向OEM(original equipment manufacture)的单ECU多点顺序喷射的汽油/CNG两用燃料控制方案。设计了λ非对称振荡PI控制算法等天然气特有的控制策略，并进行了发动机台架性能和整车排放试验。结果表明：两用燃料发动机采用单ECU控制时的性能优于采用主从式双ECU系统，且排放低于国Ⅳ限值。
Abstract:
The CNG/gasoline bi-fuel vehicle using CNG as the primary fuel and gasoline as a secondary has good economy and emission performance，but the traditional bi-fuel engine uses master/slave dual ECU system cannot realize it. For improving the performance，the research with multi-point sequential injection based on single ECU which is designed for OEM is made. The CNG special control strategies are designed such as Lambda PI control logic of Non-symmetric oscillation，and also the experimental investigation for this bi-fuel engine and the emission test of vehicle are carried out. According to the experiment results，the performance of engine with single ECU is better than the engine with master/slave dual ECU，and the value of emission is less than euro IV emission levels when we use CNG fuel.