Patents by Inventor Zhiping S. Liu

Zhiping S. Liu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and system for estimating mass airflow using a mass airflow sensor
    Patent number: 10934960
    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.
    Type: Grant
    Filed: November 2, 2018
    Date of Patent: March 2, 2021
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Zhijian J. Wu, Zhiping S. Liu, Ping Ge, Martino A. Casetti, Gregory P. Matthews
  • METHOD AND SYSTEM FOR ESTIMATING MASS AIRFLOW USING A MASS AIRFLOW SENSOR
    Publication number: 20200141346
    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.
    Type: Application
    Filed: November 2, 2018
    Publication date: May 7, 2020
    Inventors: Zhijian J. Wu, Zhiping S. Liu, Ping Ge, Martino A. Casetti, Gregory P. Matthews