Patents by Inventor Daniel H. Hooker

Daniel H. Hooker 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).

  • Brake booster vacuum sensor diagnostic
    Patent number: 7076347
    Abstract: A diagnostic system for a brake booster sensor includes a monitor that monitors a maximum error and a minimum error based on a brake booster sensor signal over a monitoring period. A first comparator determines one of a pass status and a fail status of the brake booster sensor based on the maximum error and the minimum error.
    Type: Grant
    Filed: January 23, 2004
    Date of Patent: July 11, 2006
    Assignee: General Motors Corporation
    Inventors: Chad W. Lehner, Daniel H. Hooker
  • Secondary air injection diagnostic system using pressure feedback
    Patent number: 6983590
    Abstract: A diagnostic system according to the present invention diagnoses system failure of a secondary air injection system. The secondary air injection system includes a pump that provides air to an exhaust system via a conduit and a valve that controls the flow of air through the conduit. A pressure sensor measures pressure in the conduit. A controller predicts pressure in the conduit during first, second and third operational phases of the secondary air injection system. The controller compares the measured pressure to the predicted pressure to evaluate operation of the secondary air injection system. During the first phase, the secondary air injection system is used to reduce vehicle emissions. During the second phase, the valve is shut while the pump is on. During the third phase, the pump is turned off while the valve is closed.
    Type: Grant
    Filed: October 22, 2002
    Date of Patent: January 10, 2006
    Assignee: General Motors Corporation
    Inventors: Matthew J. Roelle, Martin L. Hall, Daniel H. Hooker, Gary E. Johnston, Kevin E. Person, Jeffrey M. Polidan
  • Secondary air injection diagnostic system using pressure feedback
    Publication number: 20040074453
    Abstract: A diagnostic system according to the present invention diagnoses system failure of a secondary air injection system. The secondary air injection system includes a pump that provides air to an exhaust system via a conduit and a valve that controls the flow of air through the conduit. A pressure sensor measures pressure in the conduit. A controller predicts pressure in the conduit during first, second and third operational phases of the secondary air injection system. The controller compares the measured pressure to the predicted pressure to evaluate operation of the secondary air injection system. During the first phase, the secondary air injection system is used to reduce vehicle emissions. During the second phase, the valve is shut while the pump is on. During the third phase, the pump is turned off while the valve is closed.
    Type: Application
    Filed: October 22, 2002
    Publication date: April 22, 2004
    Inventors: Matthew J. Roelle, Martin L. Hall, Daniel H. Hooker, Gary E. Johnston, Kevin E. Person, Jeffrey M. Polidan