-
公开(公告)号:US10934960B2
公开(公告)日:2021-03-02
申请号:US16179030
申请日:2018-11-02
Applicant: GM Global Technology Operations LLC
Inventor: Zhijian J. Wu , Zhiping S. Liu , Ping Ge , Martino A. Casetti , Gregory P. Matthews
Abstract: A method and system for estimating air mass per cylinder of an internal combustion engine is provided. An output signal from a MAF sensor is digitally processed to provide an estimate air mass per cylinder (APC). The system includes the MAF sensor; a data acquisition unit configured to receive an output signal from the MAF sensor and produce a sampled signal having a sampling rate greater than one sample per firing event; a multiple band pass (MBP) filter configured to remove signal components caused by airflow pulsations and oscillations through the MAF sensor; an envelope detector configured to detect the lower and upper envelopes of the MBP filtered signal; a MAF estimator configured to estimate a mass airflow based on the detected lower and upper envelopes; a signal decimator; a low pass filter; and a APC converter to converted the low pass filtered signal into an estimated APC.