Electronically controlled exhaust gas purifying system

Details Electronically controlled exhaust gas purifying system Electronically controlled exhaust gas purifying system

1975-05-06

1977-05-17

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60285, 60289, 123117R, F01N 300, F02B 7510

Patent

active

040233596

ABSTRACT:
An electronically controlled exhaust gas purifying system for use with an internal combustion engine of a motor vehicle including not only a catalytic converter but also an auxiliary thermal reactor which is located upstream of the catalytic converter and by which exhaust gases emitted from the engine is re-combusted to the extent that the catalytic converter is not destroyed or damaged by the residual unconsumed compounds in exhaust gases discharged from the thermal reactor. The system is provided with an electronic control means for shutting off the flow of secondary air to be mixed with the exhaust gases emitted from the engine both when at least one of the temperatures of the catalytic converter and the thermal reactor rises above a critical value at which they would be destroyed or damaged, and when the engine is under cranking operation. The electronic control means retards the spark in order to heat the exhaust gases when the temperature of the reactor falls to its reaction commencement temperature. In the event that the rate of temperature rise of the thermal reactor exceeds a threshold value, the electronic control means does not retard the spark even if the temperature of the thermal reactor falls to the reaction commencement temperature, but then retards the spark when the temperature of the thermal reactor falls below a predetermined value which is set lower than that of the reaction commencement temperature.

REFERENCES:
patent: 3203168 (1965-08-01), Thomas
patent: 3406515 (1968-10-01), Behrens
patent: 3680318 (1972-08-01), Nakajima
patent: 3732696 (1973-05-01), Masaki
patent: 3738108 (1973-06-01), Goto
patent: 3826089 (1974-07-01), Nakajima

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