基于李雅普指数的汽车发动机故障诊断研究

Application of Lyapunov Exponents to Fault Diagnosis of Diesel Engines

研究了斯太尔汽车发动机系统非线性特性 ,针对其不同的状态 ,利用测量的振动时间序列求解了系统的最大李雅普指数。结果表明 :该发动机振动的时间序列在不同状态下李雅普指数不同 ,因此可以李雅普指数作为识别其状态的特征量 。

The nonlinear behavior of Steyr diesel engines is studied.The Lyapvnov exponent is estimated from an experimental time series based on its different state. The experimental results show that the Lyapvnov exponent is different for the different state and can be used as characteristics for recognizing the diesel engine′s fault. The rule for fault Diagnosis of Stery diesel engines is extracted by using Lyapvnov exponent.