Susan Lynn Lloyd

US Patent:

54620384, Oct 31, 1995

Filed:

Dec 9, 1994

Appl. No.:

8/352472

Inventors:

Allan J. Kotwicki - Dearborn MI
Paul J. Szuszman - Ann Arbor MI
Edward L. Christensen - Farmington MI
Susan J. Lloyd - Ann Arbor MI

Assignee:

Ford Motor Company - Dearborn MI

International Classification:

F02D 4114

US Classification:

123681

Abstract:

An air/fuel control system (8) and method to maintain the air/fuel ratio of each engine bank (28) out of phase with one another. A feedback variable is generated (410-428) in response to a comparison of a difference in exhaust gas oxygen sensors (44, 55) from respective left and right engine banks (56, 57) to a reference (104-120). Separate feedback variables are generated for each engine bank by phase inverting the feedback variable between the banks and adding an adjustment signal (450-462). The adjustment signal is generated from a PI controller responsive to a comparison of the sum of the left and right exhaust gas oxygen sensors (44, 55) to a reference (440-448).