Exhaust circulation control valve for automotive engines

Details Exhaust circulation control valve for automotive engines Exhaust circulation control valve for automotive engines

1998-06-22

2000-03-28

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

F02M 2507

Patent

active

060417641

ABSTRACT:
An object of the present invention is to provide an exhaust circulation control valve having a simple structure and having both high-precision low-flow control characteristics and responsive large-flow control characteristics. In an exhaust circulation control valve 1, there are disposed an exhaust gas inlet port 6 for letting in exhaust gas from an exhaust gas path 2 of an engine E and an exhaust gas feed port 7 feeding the exhaust gas to an inlet path 3. Exhaust gas inlet port 6 and feed port 7 are made continuous with each other via coaxially disposed first and second openings 11, 12. First and second valve bodies 15, 16 are disposed on openings 11, 12 respectively in order to open and close the openings. First valve 15 is controlled by a drive mechanism 17 based on the operating state of engine E. Second valve 15 is kept in a closed state by a spring 19. Thus, when the lift on first valve 15 is small, exhaust gas flows only through first opening 11. When there is a large lift at valve 15, however, second valve 16 is activated as well, and the exhaust gas flows through both first and second openings 11, 12.

REFERENCES:
patent: 3934564 (1976-01-01), Barnert
patent: 4041913 (1977-08-01), Nohira
patent: 4048967 (1977-09-01), Stumpp
patent: 4171688 (1979-10-01), Takahashi
patent: 4350013 (1982-09-01), Yoshiba
patent: 4366799 (1983-01-01), Suda

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