Engine fuel supply control device

Details Engine fuel supply control device Engine fuel supply control device

1996-07-22

1998-07-28

Wolfe, Willis R.

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60285, F01N 328

Patent

active

057848807

ABSTRACT:
For an engine for which fuel supply is cut off in predetermined deceleration conditions, the catalyst temperature of a catalytic converter is inferred and the amount of intake air is measured. If the catalyst temperature is high and also the amount of intake air is great, then the cutting off of fuel supply is prohibited, and instead fuel combustion is performed under rich conditions. Since during fuel supply cut off the amount of oxygen supplied to the catalytic converter is relatively increased, and the temperature of the catalyst becomes elevated due to reaction between this oxygen and the catalyst within the catalytic converter, accordingly this increase of the catalyst temperature is prevented by prohibiting fuel supply cut off in such conditions in which elevation of the temperature of the catalyst can easily occur. A rich air/fuel ratio is not applied if the temperature of the catalyst is low or if the amount of intake air is small, and accordingly the danger of misfiring, which in these circumstances is invited by a rich air/fuel ratio, is avoided.

REFERENCES:
patent: 4656829 (1987-04-01), Creps et al.
patent: 5570575 (1996-11-01), Sato et al.
patent: 5586432 (1996-12-01), Huemer et al.
patent: 5606855 (1997-03-01), Tomisawa
patent: 5622049 (1997-04-01), Kitamura et al.
patent: 5649420 (1997-07-01), Mukaihira et al.

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