用低通滤波法处理内燃机缸内流动的LDA测量数据

ANALYZING LDA MEASUREMENT DATA OF IN-CYLINDER AIR FLOW IN AN INTERNAL COMBUSTION ENGINE BY USING LOW-PASS FILTER

本文根据内燃机缸内流动的LDA测量数据的特点，讨论了低通滤波过程、数据预处理过程、截止频率的选择、数据处理误差等，论述了在目前LDA测量数据率还不够高的情况下，如何较好地用低通滤波法对LDA测量数据进行单一循环分析处理，最大限度地减少数据处理误差．

In this paper, according to the feature of LDA measurement data of in-cylinder air flow in an internal combustion engine, the authors discussed the method of low-pass filter, the work of data pre-process, the selection of cut-off frequency and the errors in data processing,and illustrated how to obtain a better result of cycle-resolved analysis by using low-pass filter under the condition of not enough high LDA data rate.