Exhaust gas system for internal combustion engines

Details Exhaust gas system for internal combustion engines Exhaust gas system for internal combustion engines

1980-03-05

1981-09-08

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60288, 60301, 123198F, F01N 315, F02D 1700

Patent

active

042877164

ABSTRACT:
An exhaust gas system for a multi-cylinder internal combustion engine, in which some cylinders are adapted to be effectively disconnected; the exhaust gas system includes in a common exhaust line, an O.sub.2 -probe and two series-connected catalysts while a separate exhaust gas line is coordinated to the cylinders adapted to be effectively disconnected; a control member operable as a function of load opens three separate branch connections from the separate exhaust line to the common exhaust line in such a manner that when all cylinders are firing, the branch connection terminating upstream of the O.sub.2 -probe is opened; the branch terminating in the common exhaust line between the O.sub.2 -probe and the first of the series-connected catalysts is opened when at least one of the cylinders is effectively disconnected and when the internal combustion engine is still relatively cold or warms up to a middle temperature; at temperatures exceeding the middle operating temperature, the branch connection terminating between the two catalysts is opened.

REFERENCES:
patent: 3708980 (1973-01-01), Truxell
patent: 3984975 (1976-10-01), Price
patent: 4107921 (1978-08-01), Iizuka
patent: 4245471 (1981-01-01), Sugasawa

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