Air/fuel control system with hego current pumping

U.S. Patent Number: 5379590

Abstract: A control system for maintaining engine air/fuel operation within the efficiency window of a catalytic converter. An exhaust gas oxygen sensor having a step change between first and second output states and positioned downstream of the converter. A step change in the downstream sensor output is initialized to an initial air/fuel ratio by pumping current through one of the sensing electrodes of the downstream sensor. An emission control signal is derived from the initialized downstream sensor output to bias an air/fuel feedback loop.

Inventors: Hamburg; Douglas R. (Bloomfield, MI), Logothetis; Eleftherios M. (Birmingham, MI), Cook; Jeffrey A. (Dearborn, MI), Rimai; Lajos (Dearborn, MI)

Assignee: Ford Motor Company (Dearborn, MI)

Application Number: 08/132,407

Issued: 1995-01-10

Expired: 2007-01-10

Classes: 60/276 ; 123/703; 60/285

Field of search: 60/276,285,274,277 123/672,703

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