Patents by Inventor Zhijian J. Wu

Zhijian J. Wu 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).

  • Publication number: 20240253523
    Abstract: An electric vehicle includes a reconfigurable energy storage system with a first submodule and a second submodule. An interface circuit is operable to transfer a charging power to the reconfigurable energy storage system from a charging station that is external to the electric vehicle. A switching circuit is operable to electrically arrange the first submodule and the second submodule in series or in parallel. A diode is operable to convey the charging power between the first submodule and the second submodule while the reconfigurable energy storage system is arranged in series and the charging power is present. A bias circuit is operable to maintain a reverse bias across the diode while the reconfigurable energy storage system is arranged in series and the charging power is absent.
    Type: Application
    Filed: January 26, 2023
    Publication date: August 1, 2024
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Brendan M. Conlon, Zhijian J. Wu
  • 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
  • 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
  • Patent number: 10352223
    Abstract: A method for cold start emissions diagnostic of a catalytic treatment device of an internal combustion engine includes determining a torque reserve; determining a catalyst light off (CLO) state; integrating the total torque reserve over a time period established by the CLO state; determining if a value from the integration exceeds an integration threshold; and if the value from the integration exceeds the integration threshold, indicating that the cold start emissions diagnostic is positive.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: July 16, 2019
    Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
    Inventors: Gregory J. York, Vijay A. Ramappan, Zhijian J. Wu
  • Publication number: 20190072019
    Abstract: A method for cold start emissions diagnostic of a catalytic treatment device of an internal combustion engine includes determining a torque reserve; determining a catalyst light off (CLO) state; integrating the total torque reserve over a time period established by the CLO state; determining if a value from the integration exceeds an integration threshold; and if the value from the integration exceeds the integration threshold, indicating that the cold start emissions diagnostic is positive.
    Type: Application
    Filed: September 7, 2017
    Publication date: March 7, 2019
    Inventors: Gregory J. York, Vijay A. Ramappan, Zhijian J. Wu
  • Patent number: 9879630
    Abstract: Rationality diagnostic techniques for an intake oxygen sensor are utilized to detect sensor malfunction. A non-intrusive diagnostic technique includes passively detecting when an exhaust gas recirculation (EGR) valve position crosses low/high position thresholds, whereas an intrusive diagnostic technique includes actively commanding the EGR valve to predetermined low/high positions. During a period after the EGR valve position reaches/crosses at least one of the low/high positions/position thresholds, respectively, maximum and minimum intake oxygen concentration is monitored. When the EGR valve position has crossed both the low/high positions/position thresholds and a difference between the maximum and minimum oxygen concentrations is less than a respective difference threshold, a malfunction of the intake oxygen sensor is detected. A malfunction indicator lamp (MIL) could be set to indicate the malfunction.
    Type: Grant
    Filed: November 19, 2014
    Date of Patent: January 30, 2018
    Assignee: FCA US LLC
    Inventors: Yichao Guo, Robert Stack, Zhijian J Wu
  • Publication number: 20160138527
    Abstract: Rationality diagnostic techniques for an intake oxygen sensor are utilized to detect sensor malfunction. A non-intrusive diagnostic technique includes passively detecting when an exhaust gas recirculation (EGR) valve position crosses low/high position thresholds, whereas an intrusive diagnostic technique includes actively commanding the EGR valve to predetermined low/high positions. During a period after the EGR valve position reaches/crosses at least one of the low/high positions/position thresholds, respectively, maximum and minimum intake oxygen concentration is monitored. When the EGR valve position has crossed both the low/high positions/position thresholds and a difference between the maximum and minimum oxygen concentrations is less than a respective difference threshold, a malfunction of the intake oxygen sensor is detected. A malfunction indicator lamp (MIL) could be set to indicate the malfunction.
    Type: Application
    Filed: November 19, 2014
    Publication date: May 19, 2016
    Inventors: Yichao Guo, Robert Stack, Zhijian J. Wu
  • Patent number: 7660694
    Abstract: A method and arrangement is provided for estimating an initial value for an internal battery temperature of a vehicle using a four zone process that determines which of a predetermined set of time zones correlates with a measured period of time for an engine of the vehicle being in an engine-off condition. Once the time zone is determined, an initial estimated value of the internal temperature of the battery is determined as a function of a set of parameters correlated with the determined time zone. The set of time zones include a holding time zone, a model based estimation time zone which is greater in time than the holding time zone, a first self-adjustment zone which is greater in time than the model based estimation time zone, and a second self-adjustment time zone which is greater in time than the first self-adjustment time zone.
    Type: Grant
    Filed: September 12, 2006
    Date of Patent: February 9, 2010
    Assignee: Chrysler Group LLC
    Inventors: Zhijian J. Wu, Michel Trumbo, Yijun Tu, Min Han