Catalyst warming up device of an internal combustion engine

Details Catalyst warming up device of an internal combustion engine Catalyst warming up device of an internal combustion engine

1994-03-11

1995-08-29

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60284, 60289, 60300, F01N 320

Patent

active

054449782

ABSTRACT:
A catalyst warming up device of an internal combustion engine includes an electrically heated type catalyst disposed in an exhaust gas passage of the engine and a unit for supplying secondary air into the exhaust gas passage at an upstream of the catalyst. The secondary air supply and the catalyst energization are controlled in such a manner that, during an engine warming up condition, in which an air-fuel ratio of a mixture introduced into engine cylinders is controlled to be rich, if the air-fuel ratio of the exhaust gas is detected as lean or the same as a theoretical air-fuel ratio due to the secondary air, the secondary air is supplied to the exhaust gas passage after the catalyst is energized, and if the air-fuel ratio of the exhaust gas cannot be controlled to lean or the same as a theoretical air-fuel ratio, an operation of the catalyst energization is stopped.

REFERENCES:
patent: 3723070 (1973-03-01), Houdry
patent: 5257501 (1993-11-01), Wataya
patent: 5265418 (1993-11-01), Smith

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