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US 7,581,533 B1Granted
Three mode cooler for exhaust gas recirculation
AssigneeGM Global Technology Operations LLC
InventorRobert J. Moran
Life of this patent
Estimating the term…
Abstract
An exhaust gas recirculation system for an engine provides three modes of operation. In a bypass mode, exhaust gas bypasses a heat exchanger. In a single pass mode of operation, exhaust gas flows through the heat exchanger passageways. In a dual pass mode of operation, exhaust gas flows through the heat exchanger passageways in a manner that provides a longer effective flow length through the heat exchanger compared to the single pass mode, thereby to increase cooling efficacy.
Claims13
An exhaust gas recirculation system for an engine having an exhaust manifold and an intake manifold, comprising:
- a valve assembly including a valve housing and at least one valve member, the valve housing defining a first port and a second port and being operatively connectable to the engine such that the first port receives exhaust gas from the exhaust manifold and the second port is in fluid communication with the intake manifold;
- and
- a heat exchanger defining a first passageway and a second passageway;
- wherein the at least one valve member is selectively movable with respect to the valve housing to provide
- a first mode of operation in which exhaust gas from the inlet port flows to the outlet port without flowing through either of the first and second passageways of the heat exchanger,
- a second mode of operation in which exhaust gas from the inlet port flows through the first and second passageways in series to the outlet port, and
- a third mode of operation in which exhaust gas from the inlet port flows through the first and second passageways in parallel to the outlet port.
4 more elements
An exhaust gas recirculation system for an engine having an exhaust manifold and an intake manifold, comprising:
- a valve assembly including a valve housing and at least one valve member, the valve housing defining a chamber having first, second, third, fourth, and fifth ports and being operatively connectable to the engine such that the chamber receives exhaust gas from the exhaust manifold through the first port and such that the chamber is in fluid communication with the intake manifold via the second port;
- a heat exchanger defining a first passageway in fluid communication with the third port and a second passageway in fluid communication with the fourth port;
- structure defining a third passageway providing fluid communication between the first and second passageways and the fifth port;
- wherein the at least one valve member is selectively movable with respect to the valve housing to provide
- a first mode of operation in which exhaust gas from the first port flows to the second port without flowing through either of the first and second passageways of the heat exchanger,
- a second mode of operation in which exhaust gas from the first port flows through the first and second passageways consecutively, and
- a third mode of operation in which exhaust gas from the inlet port flows through the first, second, and third passageways.
4 more elements
An engine comprising:
- an intake manifold;
- an exhaust manifold;
- a valve assembly including a valve housing and at least one valve member, the valve housing defining a chamber having first, second, third, fourth, and fifth ports and being operatively connected to the engine such that the chamber receives exhaust gas from the exhaust manifold through the first port and such that the chamber is in fluid communication with the intake manifold via the second port;
- a heat exchanger defining a first passageway in fluid communication with the third port and a second passageway in fluid communication with the fourth port;
- structure defining a third passageway providing fluid communication between the first and second passageways and the fifth port;
- wherein the at least one valve member is selectively movable with respect to the valve housing to provide
- a first mode of operation in which exhaust gas from the first port flows to the second port without flowing through either of the first and second passageways of the heat exchanger,
- a second mode of operation in which exhaust gas from the first port flows through the first and second passageways consecutively, and
- a third mode of operation in which exhaust gas from the inlet port flows through the first, second, and third passageways.
6 more elements
Dependencies are inferred from the claim text.