Abstract：The method of evaluating internal combustion engine idle speed combustion stability by using CPS signal to calculate crankshaft angular acceleration parameters was put forward. The missing teeth position of CPS signal was distinguished and the zero points at missing teeth were supplemented. The crankshaft angular velocity and acceleration were calculated from CPS signal and then processed through wavelet threshold denoising method. The linear correlation between angular acceleration parameters and corresponding cylinder pressure parameters was analyzed. The angular acceleration parameters are highly correlated with corresponding cylinder pressure parameters，which proves that the method of using CPS signal to calculate angular acceleration parameters to evaluate internal combustion engine idle speed combustion stability is feasible.
2013, Vol. 32 
