基于二阶滑模技术的内燃机气缸压力的估计  

Cylinder Pressure Estimation for Engines Using Second-Order Sliding Modes

作　　者：王赟松[1] 褚福磊[1] 郭丹[1] 

机构地区：[1]清华大学精密仪器与机械学系,北京100084

出　　处：《内燃机学报》2004年第6期555-561,共7页Transactions of Csice

基　　金：教育部跨世纪优秀人才培养计划项目;中国博士后科学基金资助项目(20040350059)。

摘　　要：气缸压力是内燃机燃烧分析或故障诊断的重要参数。提出了一种新的内燃机气缸压力的估计方法,应用二阶滑模控制理论对测量的曲轴转速进行实时微分,在线估计指示转矩;以估计的指示转矩作注射信号,对气缸压力估计器不断进行修正,通过合理选择增益,确保气缸压力误差动力学稳定性,最终得到气缸压力估计值。仿真结果表明,基于二阶滑模方法的气缸压力估计方法是可行的,具有较高的精度;而且该算法只需要测量发动机转速信号,方法简单可靠,成本低。Cylinder pressure is an important parameter for engine combustion analysis, engine diagnosis, and engine controlling, etc. A novel approach is introduced for estimating the cylinder pressure of multi-cylinder internal combustion engines based on engine speed signals. Second-order sliding mode technique is used for the stimation. Second-order differentiator based on the super-twisting algorithm is employed for the real-time differentiation of the measured crankshaft speed, and obtains the indicated engine torque by subtracting the contribution of the friction and load torque to the crankshaft acceleration. By injected the estimated indicated torque to a replica of the combustion dynamic model, a cylinder pressure estimator is developed. Since peak pressure occurs during power stroke, thus pressure estimation can be switched off during the other strokes. The simulated results show that the proposed method can reconstruct cylinder pressure accurately under normal engine operating conditions.

关 键 词：内燃机 二阶滑模 气缸压力 估计 

分 类 号：TK401[动力工程及工程热物理—动力机械及工程]