基于燃烧状态反馈的柴油机低温冷起动逐循环控制研究OA北大核心CSTPCD

In order to improve the poor combustion cycle of low-temperature cold starting conditions,a combustion status feedback system was developed by CompactRIO controller.The cylinder pressure acquisition and real-time calculation and feedback of combustion state parameters were achieved.The influences of injection timing on CA50(the crank angle corresponding to the cumulative heat release in the cylinder reaches 50%)at different temperatures and speeds were researched by experiments.The cycle-by-cycle control method of injection timing based on the feedback of combustion state was proposed,achieving the matching of combustion parameters and control parameters.After the control method was adopted,the CA50 was more concentrated in the efficient combustion zone,the maximum combustion pressure was higher and the bad combustion cycle was improved.And the starting time was reduced by 36%on average,which effectively improved the performance of low temperature cold starting of the diesel engine.