Engine air-fuel ratio controller and control method

Details Engine air-fuel ratio controller and control method Engine air-fuel ratio controller and control method

1999-01-29

2000-11-21

Hoang, Tu Ba

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 123489, F01N 300

Patent

active

061486116

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.

REFERENCES:
patent: 4216653 (1980-08-01), Nakase et al.
patent: 4805578 (1989-02-01), Kikuchi et al.
patent: 5379586 (1995-01-01), Honji et al.
patent: 5758631 (1998-06-01), Teraoka
patent: 5941211 (1999-08-01), Brehob et al.
patent: 5988144 (1999-11-01), Yoshioka et al.

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