Exhaust gas detoxication system for a motor vehicle combustion e

Details Exhaust gas detoxication system for a motor vehicle combustion e Exhaust gas detoxication system for a motor vehicle combustion e

1974-04-10

1976-02-17

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60285, 60290, 123117A, 137554, F02B 7510

Patent

active

039383296

ABSTRACT:
An exhaust gas detoxication system for a motor vehicle combustion engine with external ignition includes an air pump driven by the engine to deliver secondary air into the exhaust system. The exhaust system contains a thermal reactor wherein final combustion of as yet unburned constituents of the exhaust gas takes place. Since as the speed of the engine increases, more air is delivered than required for final combustion, a blow-off valve is arranged in the delivery line of the air pump, limiting the flow of air supplied to the exhaust system and in general shutting it off completely at a certain engine speed. Exhaust gas detoxication systems to which the invention relates are provided with a means for shifting to retarded ignition during the warm-up phase of the reactor, whereby elevated temperatures of the exhaust gases and hence a faster response of the reactor are obtained. This retardation of the ignition, however, is injurious at high rotational speeds; and therefore, a speed controlled device overriding this shifting means is provided. This device, at an engine speed above a certain value, actuates a switch that shifts the ignition time to advanced ignition.

REFERENCES:
patent: 2732833 (1956-01-01), Hook
patent: 3205909 (1965-09-01), Oldfield
patent: 3272191 (1966-09-01), Walker
patent: 3685295 (1972-08-01), Tatsutomi
patent: 3796049 (1974-03-01), Hayashi
patent: 3824788 (1974-07-01), Cole

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