汽车发动机点火正时系统为一多元时变非线性系统，适当的点火时刻有助于提高汽车的动力性、降低油耗、减少排污量。因此，发动机点火正时系统的优化控制是一个倍受关注的问题。由于发动机点火正时系统的数学模型很难建立，不能采用经典控制理论的方法实现自动控制。本文采用模糊控制方法，在人工机械调整点火提前角控制发动机爆震经验的基础上，建立从属函数，力图使汽车发动机运行于临界爆振工况，达到发动机点火正时系统的优化控制 The ignition timing system of a car engine is a multi-variable time-varying non-linear system. The proper ignition timing helps to improve the power of the car, reduce fuel consumption and reduce the amount of discharge. Therefore, the optimal control of engine ignition timing system is a concern. As the mathematical model of engine ignition timing system is difficult to establish, we can not use the method of classical control theory to achieve automatic control. In this paper, based on the fuzzy control method, based on the experience of ignition control of the engine by adjusting the ignition advance angle, a membership function is established to try to make the car engine run at the critical explosion operating condition and achieve the optimal control of the engine ignition timing system