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US 5,937,834 AGranted
Exhaust gas recirculation apparatus
AssigneeIsuzu Motors Limited
InventorTakashi Oto
Life of this patent
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AssigneeIsuzu Motors Limited
InventorTakashi Oto
Estimating the term…
An exhaust gas recirculation apparatus capable of preventing the occurrence of dewing inside an exhaust gas recirculation pipe after the engine stop and corrosion inside the exhaust gas recirculation pipe, an EGR valve, a reed valve, etc., and eventually capable of improving engine durability and engine life. This exhaust gas recirculation apparatus includes an exhaust gas recirculation pipe having an EGR valve for controlling an exhaust recirculation quantity and connected between an exhaust passage and an intake passage in an internal combustion engine equipped with a supercharger, and a check valve for preventing intake air from flowing into the exhaust gas recirculation pipe when an internal pressure of the exhaust gas recirculation pipe is lower than an internal pressure of the intake passage, disposed at the junction between the exhaust gas recirculation pipe and the intake passage, wherein the check valve has a clearance for communication between the exhaust gas recirculation pipe and the intake passage while the engine stops.
An exhaust gas recirculation apparatus including an exhaust gas recirculation pipe equipped with an EGR valve for controlling an exhaust gas recirculation quantity, so disposed as to be connected from an exhaust passage to an intake passage in an internal combustion engine equipped with a supercharger, and a check valve for preventing intake air from flowing into said exhaust gas recirculation pipe when an internal pressure of said exhaust gas recirculation pipe is lower than an internal pressure of said intake passage, disposed at the junction of said exhaust gas recirculation pipe and said intake passage, wherein said check valve has a clearance for communication between said exhaust gas recirculation pipe and said intake passage while said engine stops.
An exhaust gas recirculation apparatus including an exhaust gas recirculation pipe so disposed as to be connected from an exhaust passage to an intake passage in an internal combustion engine equipped with a supercharger and a check valve for preventing intake air from flowing into said exhaust gas recirculation pipe when an internal pressure of said exhaust gas recirculation pipe is lower than an internal pressure of said intake passage disposed at the junction between said exhaust gas recirculation pipe and said intake passage, wherein an open valve for opening said exhaust gas recirculation pipe to the atmosphere at completion of recirculation of the exhaust gas is disposed on the exhaust gas recirculation pipe upstream side of said check valve.
Dependencies are inferred from the claim text.