Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1993-11-29
1994-12-27
Dolinar, Andrew M.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 123681, 123691, 123696, F01N 320, F02D 4114
Patent
active
053754158
ABSTRACT:
An engine air/fuel feedback control system adjusts the engine air/fuel ratio in response to a modified output of an exhaust gas oxygen sensor. A sensor output is compared to a reference at its nominal midpoint to develop a two-state signal indicating operation rich or lean of stoichiometry. This two-state or step output is shifted towards the peak efficiency window of a catalytic converter by pumping current through a sensor electrode in response to an error signal derived from a downstream sensor. Shifts in the upstream sensor amplitude caused by current pumping are corrected by a correction factor which is adaptively learned during a test cycle.
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ACS Symposium Series 309, Fundamentals and Applications of Chemical Sensors, "High-Temperature Oxygen Sensors Based on Electrochemical Oxygen Pumping" by E. M. Logothetis and R. E. Hetrick, pp. 136-154, American Chemical Society 1986 (month unknown).
Hamburg Douglas R.
Logothetis Eleftherios M.
Dolinar Andrew M.
Ford Motor Company
Lippa Allan J.
May Roger L.
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