초록 ▼

An electrically operated EGR valve has a pintle for opening and closing the valve. The pintle is actuated by an linear actuator to open and close two ports which are connected to the outlet of the valve. The pintle has a frustoconical surface which mates with the two ports. The input passageway to t

An electrically operated EGR valve has a pintle for opening and closing the valve. The pintle is actuated by an linear actuator to open and close two ports which are connected to the outlet of the valve. The pintle has a frustoconical surface which mates with the two ports. The input passageway to the EGR valve is in fluid communication with both sides of the pintle which are the sides taken in direction of the movement of the linear actuator. The pintle being pressure-balanced when the electrically operated linear actuator attempts to move the pintle to either further open or further close the ports, the pintle is more responsive without increasing the size of the actuator.

대표청구항 ▼

An internal combustion engine comprising exhaust gas recirculation (EGR) apparatus wherein a portion of the engine exhaust gas is recirculated in a controlled manner by an electrically controlled EGR valve to dope a fresh air-fuel charge for the engine with some of the engine\s exhaust gas, said EGR

An internal combustion engine comprising exhaust gas recirculation (EGR) apparatus wherein a portion of the engine exhaust gas is recirculated in a controlled manner by an electrically controlled EGR valve to dope a fresh air-fuel charge for the engine with some of the engine\s exhaust gas, said EGR valve comprises a housing having an exhaust inlet to which engine exhaust is communicated, an exhaust outlet from which engine exhaust exits the valve to dope a fresh air-fuel charge, a passage extending through said housing between said exhaust inlet and said exhaust outlet, a pintle that is disposed on said housing within said passage and that is selectively linearly positionable within said housing by a linear electric actuator that positions said pintle linearly from closed position to open positions in accordance with a control signal applied to the actuator, said pintle comprising opposite axial ends, a shaft extending from one of said axial ends to said actuator, another of said axial ends of said pintle being in communication with said exhaust inlet via said passage, characterized in that said housing comprises means to communicate said exhaust inlet to said one of said axial ends of said pintle to provide at least some pressure-balancing of said pintle, said housing comprises internal seat means disposed within said passage axially intermediate said opposite axial ends of said pintle for coaction with a portion of said pintle that is axially intermediate said opposite axial ends of said pintle, and said axially intermediate portion of said pintle comprises a frustoconically tapered surface and said internal seat means comprises at least one seating surface that is at a radially inner open distal end of a pipe extending from and through a side wall of said housing that circumferentially bounds a space containing said pintle such that the selective relative positioning of said pintle to said internal seat means selectively restricts the flow of exhaust gas from said exhaust inlet to said exhaust outlet.