Exhaust gas recirculation system having active material actuated by-pass
AssigneeGM Global Technology Operations LLC
InventorsAlan L. Browne, Nancy L. Johnson, Patrick G. Szymkowicz
Life of this patent
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Abstract
An exhaust gas recirculation system adapted for use by an internal combustion engine, and for selectively diverting a recirculated portion of the engine exhaust away from the EGR cooler, includes a by-pass conduit and/or feed line shiftable between open and closed conditions, and an active material actuator.
Claims19
An EGR system adapted for use by an internal combustion engine comprising an intake and producing an exhaust, and for selectively recirculating at least a predominate portion of the exhaust back to the intake, said system comprising:
- an EGR cooler fluidly coupled to the intake and said portion of the exhaust;
- a by-pass including a conduit fluidly coupled to the intake and said portion of the exhaust, and shiftable between relatively opened and closed conditions, wherein the conditions are cooperatively configured such that the conduit and cooler are alternatively coupled to the intake and said portion, respectively;
- and
- an active material actuator operable to undergo a reversible change in fundamental property when exposed to or occluded from an activation signal, and communicatively coupled to the by-pass, such that the change causes the by-pass to shift between the opened and closed conditions.
An EGR system adapted for use by an internal combustion engine comprising an intake and producing an exhaust, and for selectively diverting a recirculated portion of the exhaust back to the intake, said system comprising:
- a by-pass conduit fluidly coupled to the intake and the portion of the exhaust;
- an EGR cooler, including a feed line, and fluidly coupled to the intake and the portion of the exhaust, wherein the line is shiftable between relatively opened and closed conditions, and the conditions are cooperatively configured such that the conduit and cooler are alternatively caused to convey a predominate fraction of the portion, respectively;
- and
- an active material actuator operable to undergo a reversible change in fundamental property when exposed to or occluded from an activation signal, and communicatively coupled to the line, such that the change causes the line to shift between the open and closed conditions.
Dependencies are inferred from the claim text.