Engine air-fuel ratio controller and control method
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United States of America Patent
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-
Nov 21, 2000
Grant Date -
N/A
app pub date -
Jan 29, 1999
filing date -
Jan 29, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
When an engine (1) is in an idle state and the engine rotation speed exceeds a predetermined value, fuel supply is stopped. In this state, fuel supply is resumed when there is a shift to a non-idle state or when the engine rotation speed falls below a predetermined value. The oxygen adsorption amount of a three-way catalyst during the time period when fuel supply is stopped, is calculated. The air-fuel ratio is made richer according to the oxygen adsorption amount of the three-way catalyst when fuel supply is resumed. By limiting the richness of the air-fuel ratio at this time, fluctuations of engine output torque in the idle running state are suppressed.
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