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US 4,071,005 AGranted
Internal combustion engine equipped with improved exhaust gas recirculation system
AssigneeNissan Motor Co., Ltd.
InventorsYasuo Nakajima, Yoshimasa Hayashi
Life of this patent
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Abstract
A conduit connecting the intake and exhaust systems of an internal combustion engine is equipped with a control valve for controlling the amount of exhaust gases passing through the conduit. A venturi portion constituting part of a Laval nozzle is provided to a portion of the conduit between the control valve and the intake system of the engine.
Claims9
An internal combustion engine having a combustion chamber therein, comprising:
- an intake system including an intake passage for passing therethrough at least air to the combustion chamber of the engine;
- an exhaust system including an exhaust passage for passing therethrough the exhaust gases discharged from the combustion chamber;
- exhaust gas recirculating means for recirculating a portion of the exhaust gases passing through the exhaust system into the combustion chamber through the intake system, said exhaust gas recirculating means including conduit means connecting the intake system and the exhaust system, and control valve means disposed in said conduit means for controlling the amount of the exhaust gases passing therethrough by varying the opening degree of said control valve means in response to an engine operating parameter;
- and
- a constant area venturi portion disposed within a portion of said conduit means and spaced apart from said control valve means of said exhaust gas recirculating means, said venturi portion constituting part of a Laval nozzle which is capable of causing exhaust gases passing therethrough to flow at the velocity of sound when the pressure differential between the upstream and downstream sides thereof is within a predetermined range, said control valve means effective for control of exhaust gas flow when said pressure differential is without said predetermined range.
2 more elements
An internal combustion engine having a combustion chamber therein, comprising:
- an intake system including an intake passage for passing therethrough at least air to the combustion chamber of the engine;
- an exhaust system including an exhaust passage for passing therethrough the exhaust gases discharged from the combustion chamber;
- exhaust gas recirculating means for recirculating a portion of the exhaust gases passing through the exhaust system into the combustion chamber through the intake system, said exhaust gas recirculating means including
- conduit means connecting the intake system and the exhaust system, and
- control valve means for controlling the amount of the exhaust gases passing therethrough by varying the opening degree of said control valve means in response to an engine operating parameter, said control valve means including a valve seat disposed inside of said conduit means, a valve head seatable on said valve seat, and a diaphragm actuator for actuating the valve head in response to a vacuum produced at a portion of the engine;
- and
- a constant area venturi portion disposed inside of a portion of said conduit means and spaced apart from the valve seat of said control valve means, said venturi portion constituting part of a Laval nozzle which is capable of causing exhaust gases passing therethrough to flow at the velocity of sound when the pressure differential between the upstream and downstream sides thereof is within a predetermined range, said control valve means effective for control of exhaust gas flow when said pressure differential is without said predetermined range.
4 more elements
Dependencies are inferred from the claim text.