Exhaust gas purification system for an internal combustion engin

Details Exhaust gas purification system for an internal combustion engin Exhaust gas purification system for an internal combustion engin

1977-01-04

1978-07-18

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Material from exhaust structure fed to engine intake

123119A, F02M 2506, F02B 7510

Patent

active

041007344

ABSTRACT:
An engine exhaust gas purification system comprises an E.G.R. passage for the recirculation of engine exhaust gases from an exhaust system of an engine back into an intake system downstream of an engine throttle valve. A first E.G.R. control valve is provided in the E.G.R. passage and operatively connected to the throttle valve to control E.G.R. flow through the E.G.R. passage. A second E.G.R. control valve is provided in the E.G.R. passage upstream of the first E.G.R. control valve to control E.G.R. flow toward the first E.G.R. control valve. A valve controller is provided for the second E.G.R. control valve and operative in response to the variation in the pressure in the E.G.R. passage between the first and second E.G.R. control valves to control the second E.G.R. control valve so that the pressure is maintained substantially constant.

REFERENCES:
patent: 3844261 (1974-10-01), Garcea
patent: 3882837 (1975-05-01), Horie
patent: 3948044 (1976-04-01), Wakita
patent: 4027638 (1977-06-01), Moriya

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