Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1993-03-31
1994-08-02
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60277, 60289, F01N 320
Patent
active
053334469
ABSTRACT:
A secondary air supplier supplies secondary air to an exhaust passage, when an engine is in a predetermined condition. An oxygen sensor detects the air-fuel ratio (A/F) in the exhaust gas. The air-fuel ratio indicates either a rich condition or a lean condition. When the engine is cold, a time counter measures a lean period of time, while secondary air is supplied. When the lean period exceeds a predetermined period of time, a diagnostic system determines that the secondary air supplier is functioning properly. If the oxygen sensor detects that the ratio (A/F) indicates a rich condition during the diagnosis, then the time counter stops measuring the lean period, with keeping the total measured lean period. When the engine is hot, the ratio of the lean period to a predetermined period for the secondary air supply could be smaller than a predetermined ratio, and the diagnostic system determines that the air supplier is malfunctioning.
REFERENCES:
patent: 5060474 (1991-10-01), Aramaki
patent: 5113651 (1992-05-01), Kotzan
patent: 5119631 (1992-06-01), Kayanuma et al.
patent: 5140810 (1992-08-01), Kuroda
Toyota Technology Publication No: 2801, pp. 1 and 2, published Oct. 28, 1988.
Hart Douglas
Toyota Jidosha & Kabushiki Kaisha
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