Method for correcting combustion initial point identification deviation based on combustion excitation contribution degree

The invention provides a method for correcting a combustion initial point identification deviation based on a combustion excitation contribution degree, and belongs to the technical field of internal combustion engines. The method specifically comprises the following steps: determining a main excitation source in a vibration acceleration signal, extracting a combustion excitation response signal from the vibration acceleration signal by utilizing a principal component analysis method, calculating contribution levels of the combustion excitation response signal and corresponding combustion initial point phase deviations under different working conditions, establishing a phase deviation correction curve, and then correcting the phase deviation of the combustion initial point. According to the method, the identification precision of the combustion characteristic parameters under all working conditions can be improved. 本发明提供了一种基于燃烧激励贡献度修正燃烧始点识别偏差的方法，属于内燃机技术领域。本发明方法具体为：确定振动加速度信号中主要激励源，利用主成分分析法从振动加速度信号中提取燃烧激励响应信号，计