Engine startup air-fuel ratio controller

Details Engine startup air-fuel ratio controller Engine startup air-fuel ratio controller

1996-12-02

2000-10-03

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

60285, F02D 4106, F01N 300

Patent

active

061256285

ABSTRACT:
In a water-cooled engine comprising a catalyst for purifying exhaust in an exhaust pipe, a catalyst is rendered active at an early stage by arranging an air-fuel ratio of a fuel mixture supplied to the engine to be lean on startup. A catalyst activation water temperature corresponding to full activation of this catalyst is set, and the air-fuel ratio is arranged to be leaner than a theoretical air-fuel ratio during a period from engine startup to when a cooling water temperature reaches the catalyst activation water temperature. After the cooling water temperature reaches the catalyst activation water temperature, the air-fuel ratio is shifted to the stoichiometric air-fuel ratio. In this way, lean control is optimized to activate the catalyst.

REFERENCES:
patent: 3949551 (1976-04-01), Eichler et al.
patent: 4644921 (1987-02-01), Kobayashi et al.
patent: 5564404 (1996-10-01), Takahashi et al.
patent: 5606855 (1997-03-01), Tomisawa

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