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

IPC: F02D41/18 ,  F02D41/00 ,  F02D41/24

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.