利用转速波动信号在线识别内燃机气缸压力的研究

Research on On-Line Identification of In-Cylinder Pressure by Using Speed Fluctuation Signal

提出一种利用转速波动信号在线识别内燃机气缸压力的方法。通过分析曲轴飞轮系统的动力学特性 ,建立一个简明实用的内燃机动力学模型 ,揭示瞬时转速波动信号与气体力扭矩及各缸气体压力之间的本质联系 ,给出气缸压力波形的在线识别方法及其快速实现算法。试验及分析结果表明这种方法的可行性和有效性 。

A unique technique has been developed for on-line identification of engine in-cylinder pressure by using speed fluctuation signal. A simplified and practical dynamic engine model has been established by analyzing the dynamics and characteristics of crankshaft and flywheel system to discover the relation between the transient speed fluctuation signal and gas pressure torque as well as each cylinder pressure. Thus giving the on-line identification technique for cylinder pressure fluctuation and its fast calculation. The experiment and analysis results show that this technique is practical and feasible, it lays good foundation for detecting cylinder-to-cylinder non-uniformity and misfire.