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:
Jul. 29, 2003
Filed:
Mar. 26, 2001
Arthur R. Frelund, Okemos, MI (US);
Jay Tolsma, Grand Ledge, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A method and apparatus for controlling the amount of fuel used in combustion during open-loop run mode of a internal combustion engine. A lookup table calibrated to a fuel with a low driveability index is used to make a fueling decision for open-loop run mode. Then, at least one of the following indicators of fuel problems is monitored: the engine misfire detection system, the engine speed and the manifold absolute pressure. If any of these indicators detect a problem with the amount of fuel the engine is receiving, a fuel increase is calculated and implemented in one or more steps. A problem is indicated if an engine misfire is detected, the engine speed drops below a predetermined threshold value, or the manifold absolute pressure rises above a predetermined threshold value. The fuel increase is limited by a calculation based upon a fuel with a high driveability index.