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:
Feb. 18, 2003
Filed:
Mar. 26, 2001
Vincent A. White, Northville, MI (US);
Randal L. DuFresne, Orchard Lake, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An engine catalytic converter misfire protection method and apparatus which controls engine parameters in response to the detection of potentially damaging cylinder misfire. A misfire counter responsive to engine cylinder misfires, counts misfires over a predetermined time period, with the positive changes in the counter output integrated and then compared with a threshold count to determine if the count corresponds to a damaging misfire condition. The apparatus and method simultaneously samples a short term fuel correction signal and compares the short term fuel correction signal with a second threshold. When both thresholds are exceeded substantially at the same time, the apparatus and method shut off fuel to the misfiring cylinder and shuts off the short and long term fuel control. Verification that the proper cylinder has the fuel shut off is made by repeating the control sequence to determine if the fuel has been shut off to the same cylinders.