Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1996-12-04
1998-05-12
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60276, 60285, 123692, F01N 320
Patent
active
057492212
ABSTRACT:
In a horizontally opposed type engine, right and left exhaust pipes are provided for right and left cylinder banks, respectively and a collecting pipe is disposed to collect gases these two exhaust pipes. Further, in a two-stage catalytic converter system, two main catalysts are provided for the two exhaust pipes, respectively, and a subsidiary catalyst is provided in the collecting pipe. An oxygen sensors is provided in each of the exhaust pipes on the upstream side of it's main catalyst. The air-fuel ratios of both the banks are controlled simultaneously on the basis of the output of one of the sensors, and the air-fuel ratio of the other bank is corrected on the basis of a difference between the outputs of the two oxygen sensors. Accordingly, the air-fuel ratios of both right and left banks can be controlled appropriately, without the use of an auxiliary oxygen sensor. As a result, it is possible to improve the purification capability of the auxiliary catalyst in the collecting pipe.
REFERENCES:
patent: 4984551 (1991-01-01), Moser
patent: 5228287 (1993-07-01), Kuronishi et al.
patent: 5341788 (1994-08-01), Uchida
patent: 5417058 (1995-05-01), Shimizu
Kawahira Izuru
Miyachi Yoshihiko
Fuji Jukogyo Kabushiki Kaisha
Hart Douglas
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