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介绍了发动机控制中凸轮与曲轴盘信号的获取方法。采用合理性判别机制,把发动机信号盘的齿型系数固化到ROM中,在发动机运行过程中,采集凸轮齿、曲轴齿单齿齿宽时间,通过相邻齿之间的比值对正常齿、缺齿、多齿信号之外的高频干扰信号、丢齿信号问题进行滤波处理。在发动机工作转速范围建立曲轴信号、凸轮信号各个齿型的相邻齿齿宽比例系数MAP图,依照最大转速变化率,通过理论分析计算出单齿齿宽比例的上、下边界;同时在发动机台架上,对多转速工况下的齿型宽度信号进行测试记录,修正齿宽比例的合理性系数边界值,得出凸轮轴正常齿、多齿以及曲轴正常齿、缺齿的合理性系数,完成发动机控制同步信号的可靠获取。
The method of obtaining the signal of cam and crankshaft in engine control is introduced. The rationality discrimination mechanism is adopted to solidify the tooth profile coefficient of the engine signal disk into the ROM. During the operation of the engine, the cam teeth and the crank teeth are collected for a wide range of time, and the ratio of the adjacent teeth to the normal tooth, Tooth, multi-tooth signal outside the high-frequency interference signal, the signal loss of tooth filter processing. In the working speed range of engine, crankshaft signal and cam gear tooth profile adjacent tooth tooth width proportion coefficient MAP map are established, and the upper and lower boundary of tooth tooth width ratio is calculated through theoretical analysis according to the maximum speed change rate. At the same time, On the bench, the tooth width signal under multi-speed condition was tested and recorded, and the reasonability coefficient boundary value of tooth width ratio was modified to get the rationality coefficient of normal tooth, multi-tooth, normal tooth and cog tooth of camshaft , To achieve reliable acquisition of engine control synchronization signals.