Catalyst temperature control system for internal combustion engi

Details Catalyst temperature control system for internal combustion engi Catalyst temperature control system for internal combustion engi

1992-01-29

1993-04-13

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60278, 60285, F01N 320

Patent

active

052011739

ABSTRACT:
A catalyst temperature control system is provided for an internal combustion engine having a catalyst arranged in the exhaust system for purifying noxious components in exhaust gases emitted from the engine, and an exhaust gas recirculation passage connected to the intake system and the exhaust system for returning part of the exhaust gases from the exhaust system to the intake system. The temperature of a catalyst bed of the catalyst is detected. An ECU increases a recirculation amount of exhaust gases flowing through the exhaust gas recirculation passage, when the detected temperature of the catalyst bed is higher than a first predetermined value, and enriches the air-fuel ratio of a mixture supplied to the engine. when the detected temperature of the catalyst bed is higher than a second predetermined value upon the lapse of a predetermined time period after the start of increase of the recirculation amount.

REFERENCES:
patent: 3785151 (1974-01-01), Holl
patent: 3964258 (1976-06-01), Romano
patent: 4007589 (1977-02-01), Neidhard
patent: 4192140 (1980-03-01), Yamashita

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