Apparatus for controlling internal combustion engine mounting el

Details Apparatus for controlling internal combustion engine mounting el Apparatus for controlling internal combustion engine mounting el

1996-09-16

1998-10-20

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

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

60286, 60300, 12333918, F01N 320

Patent

active

058229833

ABSTRACT:
When an electric current is supplied to an electrically heated catalyst mounted on a vehicle, oxygen that is required is supplied by setting the air-to-fuel ratio to become lean, and the engine during this period is prevented from losing stability. When the electrically heated catalyst is in a condition to be supplied with an electric current, the alternator driven by the internal combustion engine is disconnected from the battery and the current is supplied to the electrically heated catalyst. At the same time, the air-to-fuel ratio of the internal combustion engine is set to the lean region, and a deviation is found between the present engine running speed and the target running speed found from the operation conditions of the engine. The field current of the alternator is controlled toward a direction in which the deviation decreases and, at the same time, the amount of electric power supplied from the alternator to the electrically heated catalyst is monitored. When an average amount of electric power supplied within a predetermined period of time becomes smaller than a predetermined value, the running speed of the internal combustion engine is forcibly increased to promote the rise of temperature based upon the reaction of the catalyst with the fuel and, at the same time, the internal combustion engine is prevented from losing stability even under the lean conditions.

REFERENCES:
patent: 5327991 (1994-07-01), Yoshida
patent: 5512789 (1996-04-01), Lyon
patent: 5609024 (1997-03-01), Fujiwara et al.
patent: 5645745 (1997-07-01), Hartwick et al.
SAE 1994 Transactions-Jounral of Fuels and Lubricants, Paper SAE941042, vol. 103, No. 4, 1944, USA, pp. 703-710, XP000609303, P.M. Laing: "Development of an Alternator-Powered Electrically-Heated Catalyst System" .

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