Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1993-11-26
1994-10-11
Lazarus, Ira S.
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60285, 123703, F01N 320
Patent
active
053535928
ABSTRACT:
A control system and method maintains engine air/fuel operation near stoichiometry in response to exhaust gas oxygen sensors positioned both upstream and downstream of a catalytic converter. A converter efficiency test cycle is generated during air/fuel feedback control after engine operation occurs in a plurality of airflow ranges for a period determined by a count in transitions of a feedback variable derived from the upstream sensor. Upon each transition in the downstream sensor, the measurement of inducted airflow at which such transition occurred is accumulated. At the end of the test cycle, converter efficiency is determined by an average of such airflow accumulations.
REFERENCES:
patent: 5025767 (1991-06-01), Kume et al.
patent: 5119631 (1992-06-01), Kayanuma
patent: 5125231 (1992-06-01), Patil
patent: 5220788 (1992-06-01), Kurita
patent: 5251437 (1993-10-01), Furuya
patent: 5315824 (1994-05-01), Takeshima
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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