METHOD FOR DETECTING PRE-IGNITION OF INTERNAL COMBUSTION ENGINE

The invention relates to a method for detecting the pre-ignition of an internal combustion engine comprising: integrating all instantaneous angular accelerations in a feature window to acquire integral values, and judging whether the internal combustion engine is pre-ignited according to the integral values and an pre-ignition threshold in a detection window; the feature window is an angle range corresponding to a top dead center of the compression stroke of the internal combustion engine to 3-5 consecutive signal teeth backward from the top dead center along the rotating direction of a crankshaft; the instantaneous angular accelerations correspond to the signal teeth in the feature window in a one-to-one manner. The method for detecting the pre-ignition of the present application is simple in algorithm and small in amount of calculation, only 3-5 pieces of data in the feature window are required to be numerically integrated, and the abnormal combustion is determined without complicated time-frequency analysis and vibration information reconstruction cylinder pressure; the structure of the internal combustion engine may not need to be modified and the marketization period is short; since the 58-tooth speed sensor is one of the basic configurations of the internal combustion engine, no additional device needs to be added and thus low cost is achieved; and the method has high detection accuracy for both steady-state and transient conditions and also has a good application prospect for the real vehicle environment.