Engine system and method

A pressure sensor disposed to sense an engine cylinder pressure provides a pressure signal, and an engine timing sensor provides an engine timing signal to an electronic controller, which is programmed to receive and analyze the pressure and engine timing signals to determine a misfire signal, a peak pressure signal, a pressure rise rate, an actual ignition signal, and a center of combustion signal. The electronic controller is further programmed to activate a fault flag when at least one of the misfire signal, the peak pressure signal, the pressure rise rate, the actual ignition signal, and the center of combustion signal, indicates that an abnormal combustion is present in the cylinder. 本发明公开一种发动机系统和方法。具体地，设置成感测发动机气缸压强的压强传感器提供压强信号、并且发动机正时传感器提供发动机正时信号到电子控制器，其被编程用于接收和分析压强和发动机正时信号以确定失火信号、峰值压强信号、压强升高率、实际点火信号和燃烧中心信号。电子控制器还被编程以在失火信号、峰值压强信号、压强升高率、实际点火信号和燃烧中心信号中的至少一个表示气缸中存在不正常燃烧时激活故障标记。