Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1994-08-09
1995-09-26
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60285, F01N 320
Patent
active
054525764
ABSTRACT:
An engine air/fuel control system (8) and method for controlling an engine (28) coupled to a catalytic converter (50) and for providing a measurement of engine emissions (202-296). Nitrogen oxides concentration, hydrocarbon concentration, and carbon monoxide concentration of exhaust gases downstream of the converter are measured (46, 54, and 52). Each concentration measurement is averaged for the speed load cell in which such measurement occurred (244-256). Each concentration average measurement is converted to a measurement of mass emissions emitted during a test cycle (268-284). Fuel delivered to the engine is corrected by a feedback variable (104-134, 158-178) derived from both an exhaust gas oxygen sensor (44) positioned upstream of the converter and the three sensors positioned downstream of the converter (46, 52, 54). A measurement of emissions in response to the averaged mass measurements of emission concentration downstream of the converter is also provided (278-296).
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Cook Jeffrey A.
Hamburg Douglas R.
Logothetis Eleftherios M.
Soltis Richard E.
Visser Jacobus H.
Ford Motor Company
Hart Douglas
Lippa Allan J.
May Roger L.
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