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:
Sep. 26, 2006
Filed:
Aug. 13, 2004
Stephen K. Fulcher, Milford, MI (US);
Richard B. Jess, Haslett, MI (US);
Patrick L. Risse, Rochester Hills, MI (US);
Stuart R. Smith, Howell, MI (US);
James A. Eng, Troy, MI (US);
Stephen K. Fulcher, Milford, MI (US);
Richard B. Jess, Haslett, MI (US);
Patrick L. Risse, Rochester Hills, MI (US);
Stuart R. Smith, Howell, MI (US);
James A. Eng, Troy, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An engine control system and method maintains an optimum exhaust fuel to air ratio in an internal combustion engine. A secondary air injection (SAI) pressure is measured in an SAI system. The SAI pressure measurement is converted into an SAI flow value. A fuel compensation value is obtained based on the SAI flow value. Fuel delivery is compensated to the engine based on the fuel compensation value. In a second embodiment, the fuel compensation value is obtained based on the SAI pressure measurement. Fuel delivery is compensated to the engine based on the fuel compensation value. In a third embodiment, a primary flow value is calculated at an air intake of the engine. A fuel compensation value is calculated based on the SAI flow and primary flow values. Fuel delivery to the engine is compensated based on the fuel compensation value.