Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1993-12-27
1995-01-31
Lazarus, Ira S.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60285, 123703, F01N 320
Patent
active
053850165
ABSTRACT:
A system and method of controls air/fuel ratio of an engine having exhaust manifolds from first and second cylinder banks coupled to a single catalytic converter. Fuel delivered to the cylinders of the first cylinder bank and the second cylinder bank are adjusted in response to respective first and second upstream exhaust gas oxygen sensors coupled to the first and second exhaust manifolds, and a downstream exhaust gas oxygen sensor positioned downstream of the converter. An inferred signal is read from a table having the first and second sensors as their inputs. This inferred signal is an inference of an output from a hypothetical exhaust gas oxygen sensor exposed to a hypothetical blended mixture of exhaust gases from the first and second exhaust manifolds. Converter efficiency is indicated by a ratio of a count in transitions between output states of the downstream sensor to a count in transitions between output states of the inferred signal.
REFERENCES:
patent: 4747265 (1988-05-01), Nagai et al.
patent: 5074113 (1991-12-01), Matsuoka
patent: 5115639 (1992-05-01), Gopp
patent: 5247793 (1993-09-01), Yamada
Orzel Daniel V.
Truong Tri T.
Zimlich Glenn A.
Ford Motor Company
Lazarus Ira S.
Lippa Allan J.
May Roger L.
O'Connor Daniel J.
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