Exhaust gas re-circulation control device for internal combustio

Details Exhaust gas re-circulation control device for internal combustio Exhaust gas re-circulation control device for internal combustio

1995-09-28

1997-05-27

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

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

60278, F01N 328, F02M 2506

Patent

active

056321449

ABSTRACT:
An exhaust re-circulation control device for gasoline engines is provided, which realizes efficient reduction of NOx in the low-temperature idling ranges before the catalytic converter is activated while preventing deterioration of driveability and engine stalling. Normally, an exhaust re-circulation control device comprises a re-circulation passage which re-circulates a portion of exhaust gas from an engine to an intake system and an exhaust re-circulation valve which opens and closes the re-circulation passage. Also, the engine has a bypass passage which controls idling rpm and an idling rpm control valve. In the engine, the low-temperature idling range before the catalytic converter is activated is detected exhaust re-circulation ratio is obtained and based on a target idling speed during that time to prevent deterioration of driveability and engine stalling and to efficiently reduce NOx emissions, even when the catalytic converter is not active.

REFERENCES:
patent: 4007589 (1977-02-01), Neidhard
patent: 4393840 (1983-07-01), Tanaka et al.
patent: 5201303 (1993-04-01), Kojima
patent: 5331560 (1994-07-01), Tamura
patent: 5426934 (1995-06-01), Hunt

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