Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1993-08-04
1995-02-14
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60289, F01N 322
Patent
active
053884019
ABSTRACT:
An air/fuel mixture ratio control apparatus for an internal combustion engine which carries out a fault diagnose for a secondary air supply apparatus is disclosed. The secondary air supply apparatus is installed in the engine so as to operatively introduce a secondary air to a part of an engine exhaust gas passage upstream of an oxygen concentration sensor during an engine cold duration. The air/fuel mixture ratio control apparatus compares an updated learning value of the air/fuel mixture ratio stored during the air/fuel mixture ratio feedback control and during the introduction of the secondary air to the exhaust gas passage with the updated learning value of the air/fuel mixture ratio stored during the air/fuel mixture ratio feedback control and during no introduction of the secondary air to the exhaust gas passage so as to diagnose the fault secondary air supply apparatus.
REFERENCES:
patent: 5113651 (1992-05-01), Kotzan
patent: 5119631 (1992-06-01), Kayanuma
patent: 5140810 (1992-08-01), Kuroda
63-11256 Takayuki Demura, "Self-Diagnosable Control Device For Internal Combustion Engine", Japanese Abstract, (Aug. 1988).
Kamibeppu Toru
Nishizawa Kimiyoshi
Hart Douglas
Nissan Motor Co,. Ltd.
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