基于形态滤波的发动机气缸压力信号处理

摘要

在信号预处理中采用了多项式最小二乘法去除信号的趋势项,并采用数学形态学的不同组合结构形式对二冲程发动机的缸内压力信号进行分析处理,可以去除受采集所引起的零漂的影响,滤除受点火脉冲等干扰的噪声.在滤波过程中,采用广义的不同结构元素组合顺序的形态滤波方式对实验数据进行处理,结果表明:此方法能有效地对发动机气缸压力信号进行趋势项去除处理并降噪.%In order to remove the trend term, polynomial least square method is adopted during the course of signal preprocessing, and then the different combination of structuring element of mathematical morphology is utilized, which can effectively remove the zero drift of data acquisition and filter the noise of ignition impulse. The experiment data is processed by using generalized, different structuring element sequential clustered morphological filter. The results show that the method can eliminate the trend term and de-noise the cylinder pressure signal in engine successfully.