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柴油机起动过程的优化是面向新一代排放法规时的难点与重点之一。作为判定发动机开始燃烧与否的手段,缸内压力监测几乎是一直以来唯一在应用的技术。随着电控技术的应用,通过对曲轴瞬时信号的处理与分析来判定发动机气缸内的燃烧情况,将成为一种可能。本文提出一种判定起动循环燃烧始点的新方法。通对曲轴瞬时加速度的动力学分析,从理论上证明,根据曲轴的瞬时加速度信号将能够判定起动过程燃烧始点的判定方法,并进一步从不同角度对该评定方法的可靠性进行了考核,最后,利用该方法成功实现了对起动过程喷油正时的优化。
Engine start-up optimization is one of the most difficult and important issues facing the new generation of emission regulations. As a means of deciding whether an engine starts to burn or not, in-cylinder pressure monitoring is almost always the only technology in use. With the application of electric control technology, it is possible to determine the combustion situation in the engine cylinder by processing and analyzing the crankshaft transient signal. In this paper, a new method to determine the starting point of combustion cycle is proposed. Through the dynamic analysis of the instantaneous acceleration of the crankshaft, it is theoretically proved that the determination of the starting point of combustion in the starting process can be judged according to the instantaneous acceleration signal of the crankshaft, and the reliability of the evaluation method is further evaluated from different angles. Finally, Using this method, the fuel injection timing is optimized successfully.