Richard A Stevens

Address:

24 Wonderwood Dr, Greenville, SC 29615

VIN:

1HGCP26839A163543

Make:

HONDA

Model:

ACCORD

Year:

2009

Address:

24 Wonderwood Dr, Greenville, SC 29615

VIN:

2T1KR32E57C624837

Make:

TOYOTA

Model:

MATRIX

Year:

2007

US Patent:

42652081, May 5, 1981

Filed:

May 16, 1979

Appl. No.:

6/039330

Inventors:

Philip H. Emmert - Sterling Heights MI
Richard A. Stevens - Union Lake MI
Glenn A. Walkush - Flint MI

Assignee:

General Motors Corporation - Detroit MI

International Classification:

F02M 700

US Classification:

123440

Abstract:

A closed loop air-fuel ratio controller adjusts the air and fuel ratio of the mixture supplied by a carburetor to an internal combustion engine to a predetermined ratio in response to sensed exhaust gas oxidizing-reducing conditions. An air valve is energized to bleed air into the air-fuel mixture upstream of the exhaust gas sensor and independent of the mixture supplied by the carburetor when the carburetor idle fuel system is functioning and the magnitude of the adjustment in the mixture leaning direction reaches a predetermined value in response to a sensed rich air-fuel ratio to effect a decrease in the amount of the adjustment in the lean direction. The air bleed effectively increases the lean adjustment authority of the air-fuel ratio controller and avoids a lean air-fuel ratio excursion as the carburetor operation shifts from its idle fuel circuit to its main fuel metering circuit during cold engine operation.