【摘要】 描述了一种通过柴油机曲轴瞬态转速的测量和分析 ,获得发动机气缸内气压扭矩波动波形的方法 .在发动机模型基础上 ,通过在时间域和频率域对曲轴扭转振动分析 ,经过傅立叶变换和逆变换 ,得到各缸的气压扭矩变化波形 .气压扭矩波形可用来分析各缸对发动机轴上扭矩的出力大小 ,进而判断发动机气缸内的工作状态更多还原

【Abstract】 A method for obtaining the pressure torque waveform in engine cylinders through measurement and analysis of transient speed on engine shaft is presented in this paper. Based on a simplified engine dynamic model, the cylinder pressure torque waveform can be achieved through Discrete Fourier Transform and Inverse Discrete Fourier Transform. By analysing the contribution of each cylinder to the engine torque output, the working condition in a cylinder can be evaluated and faults like misfire can be found. This method is applied to asix cylinder engine and shows good results.更多还原