基于传递函数法的柴油机气缸压力识别

在柴油发动机气缸压力的识别过程中，把缸盖系统看成一个多输入单输出的线性系统，对测试数据进行时域统计平均预处理，提高信噪比，通过时域加窗截取对于气缸压力的那一段振动响应信号，去除邻缸的干扰和其他不相关的激励力的影响．再设计一个有限冲击响应低通滤波器，消除高频噪声，求出系统的传递函数，恢复气缸压力．结果表明，恢复的气缸压力与原始信号吻合很好，特别是低幅值部分的恢复要优于其他方法．

Identification of Diesel Engine Cylinder Pressure Based on Transfer Function

In the identification of cylinder pressures, the cylinder cover system is regarded as a multi-input/ single-output linear system. The experiment data are denoised by time statistic averaging, which could improve the signal noise ratio, then the measurement signal is split up into several sequences related to the combustion pressures using time domain windows, and high frequency noise is removed using a FIR lowpass filter. The transfer function of the system is used to recover the cylinder pressure. The results show that the recovered pressure is close to the raw pressure signal, better recovery effect has been got compared with other methods especially on the low magnitude part.