基于离子电流反馈的失火循环内补火控制试验

摘要

基于自行搭建的汽油均质压燃发动机试验台架和离子电流检测系统,针对均质压燃燃烧临界工况进行了离子电流检测和闭环燃烧控制试验研究.分析了正常燃烧、部分失火及完全失火3种状态下的离子电流信号特征,提出了基于离子信号幅值或积分值为反馈信息的失火循环内补火的燃烧控制策略.补火控制试验结果表明,在均质压燃临界工况,离子电流信号幅值或信号积分,都可以作为燃烧失火判断的依据,可以应用于循环内燃烧反馈控制.失火循环内补火控制可以有效降低碳氢排放.%In a gasoline HCCI engine and using the ion current sensor,the signals of ion current were detected and combustion loop control experiments were made at the critical condition.The states of normal combustion,partial combustion and misfire are analyzed based on the ion current signal characteristics.A combustion loop control strategy was proposed.The amplitude and integral value of ion current signal are employed as the feedback information.Experimental results show that at the critical condition,both the amplitude and integral value of ion current signal can be used as the judging parameters and applied to close-loop control in combustion.Introduction of re-spark ignition in misfire cycle can reduce hydrocarbon emissions effectively.