The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 10, 2006
Filed:
Oct. 22, 2002
Matthew J. Roelle, Menlo Park, CA (US);
Martin L. Hall, Holly, MI (US);
Daniel H. Hooker, Livonia, MI (US);
Gary E. Johnston, Highland, MI (US);
Kevin E. Person, Highland, MI (US);
Jeffrey M. Polidan, Fenton, MI (US);
Matthew J. Roelle, Menlo Park, CA (US);
Martin L. Hall, Holly, MI (US);
Daniel H. Hooker, Livonia, MI (US);
Gary E. Johnston, Highland, MI (US);
Kevin E. Person, Highland, MI (US);
Jeffrey M. Polidan, Fenton, MI (US);
General Motors Corporation, Detroit, MI (US);
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.