Engine exhaust gas recirculation control mechanism
AssigneeCarter Automotive Company, Inc.
InventorSteven R. Bollinger
Life of this patent
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Abstract
A turbocharged or supercharged engine is provided with a vacuum actuated control device for an exhaust gas recirculation valve. A venturi throat in the engine air intake passage generates a vacuum in response to air flow through the throat. The vacuum is varied according to variations in the air flow rate throughout the throat, such that the vacuum can be applied to a piston for adjusting the position of a metering valve in an exhaust gas recirculation passage. The vacuum controlled valve enables the gas recirculation rate to be varied as a function of the air flow rate through the engine air intake passage.
Claims16
An exhaust gas recirculation system for an engine having an air intake passage adapted to receive pressurized air from a compressor and an exhaust gas recirculation passage connected to said air intake passage, said system comprising:
- a movable venturi throat disposed in said air intake passage for generating a reduced pressure as a function of intake air flow rate through said throat while minimizing restriction to air flow;
- a metering valve disposed in said exhaust gas recirculation passage;
- and
- control means operated by said reduced pressure generated by said movable venturi throat for actuating said metering valve.
An exhaust gas recirculation system for an engine having an air intake passage adapted to receive pressurized air from a compressor and communicating with an exhaust gas recirculation passage at a fluid junction with an intake port, said system comprising:
- flow-restricting means comprising a variable area venturi having a movable portion connected to said valve means for actuating and controlling said valve means provided in said air intake passage for generating a pressure drop in intake air flowing therethrough, said flow restricting means being disposed adjacent said junction such that exhaust gas within said recirculation passage is induced to flow through said intake port and into said intake passage at said pressure drop;
- and
- valve means disposed in said recirculation passage for metering said exhaust gas through said intake port.
Dependencies are inferred from the claim text.