Method for reducing pollutants in the exhaust gas of a multi-cyl

Details Method for reducing pollutants in the exhaust gas of a multi-cyl Method for reducing pollutants in the exhaust gas of a multi-cyl

1995-11-17

1997-09-02

Kwon, John T.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60285, 123443, F01N 300

Patent

active

056619715

ABSTRACT:
In the embodiments described in the specification pollutants in the exhaust gas of a multi-cylinder internal combustion engine of a motor vehicle having an exhaust-gas purification device containing a catalyst in the exhaust line are reduced by controlling The air/fuel ratio supplied to the cylinders of the internal combustion engine in such a way that at least one of the engine cylinders is operated with a lean air/fuel ratio and the remaining cylinders are operated with a rich air/fuel ratio while a lambda value of approximately one is maintained in the overall exhaust flow from all the cylinders. In addition to rapid heating of the catalyst in the exhaust-gas purification device and compensation for a relatively low storage capacity of the catalyst, this arrangement also reduces the quantity of untreated exhaust upstream of the catalyst.

REFERENCES:
patent: 3827237 (1974-08-01), Linder et al.
patent: 4345432 (1982-08-01), Iida et al.
patent: 5237818 (1993-08-01), Ishii et al.
patent: 5249560 (1993-10-01), Gian et al.
patent: 5522219 (1996-06-01), Orzel et al.
patent: 5535586 (1996-07-01), Ohta et al.
Patent Abstracts of Japan, vol. 18, No. 408 (M-1647), Jul. 29, 1994, and JP-A-06 117304 (Nippodenso) Apr. 26, 1994.
Patent Abstracts of Japan, vol. 950, No. 004 and JP-A-07 103034 (Unisia Jecs Corp.) Apr. 18, 1995.

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