Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1978-06-19
1980-09-16
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60284, 123491, 123438, 123435, 123179G, F01N 310
Patent
active
042222362
ABSTRACT:
A method for decreasing CO and HC emissions in a vehicle exhaust stream during the period of engine warm-up following the start of engine operation, in which the A/F mixture to the engine is pulsed by first using a mixture which is leaner than that otherwise used thus reducing the CO and HC content of the exhaust stream exiting the engine to an amount below that of the CO and HC otherwise present and then using an A/F mixture which is richer than such lean mixture and is substantially that otherwise used thus increasing the amount of CO and HC in the vehicle exhaust stream to substantially the amount otherwise present, passing the pulsed exhaust stream through a catalytic converter adapted to oxidize the CO and HC constituents, and repeating this pulsing continuously through the period of engine warm-up and at a rate sufficient to achieve increased catalytic conversion of CO and HC over that obtained without pulsing, the rate being also sufficiently rapid so as to preclude engine-stall. A preferred system for practicing the method involves apparatus for the repeated opening of the choke plate of the engine carburetor during the period when the choke plate is not full-open.
REFERENCES:
patent: 3921612 (1975-11-01), Aono
patent: 3949551 (1976-04-01), Eichler
patent: 4024706 (1977-05-01), Adawi
patent: 4040408 (1977-08-01), Kraus
patent: 4046118 (1977-09-01), Aono
patent: 4095570 (1978-06-01), Sheffer
patent: 4143621 (1979-03-01), Long
Baron Kenneth
Hegedus Louis
Oh Se H.
Carter Sidney
General Motors Corporation
Hart Douglas
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