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根据滑模控制理论,设计了汽车发动机动态转矩滑模跟踪控制方案,通过改变动态转矩,使曲轴转速平方的估计值不断跟踪其测量值,二者误差逐渐减小,动态系统收敛性得以保证,从而可以估计动态转矩和平均动态转矩。若发动机某缸(或某几缸)平均动态出现较大的负值,则可断定该缸存在故障。试验结果表明,该方法对建模误差和参数变化具有很强的鲁棒性,在中低转速和变化工况下均能实时监测气缸工作情况,准确诊断和定位故障,并能判断故障的严重程度。
According to the theory of sliding mode control, the dynamic torque sliding mode tracking control scheme of vehicle engine is designed. By changing the dynamic torque, the estimated square of the rotating speed of the crankshaft keeps track of the measured value. The error between them gradually decreases and the convergence of the dynamic system is obtained Guaranteed, so you can estimate the dynamic torque and the average dynamic torque. If the engine cylinder (or a few cylinders) on average a larger negative dynamic, you can conclude that the cylinder is faulty. The experimental results show that this method is robust to modeling errors and parameter changes. It can monitor the working condition of the cylinder in real time under the conditions of low and medium speed and changing conditions, accurately diagnose and locate the fault, and can judge the seriousness of the fault degree.