System and method for improving exhaust gas recirculation for a turbocharged engine
First Claim
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1. A system for providing EGR to an engine, comprising:
- an engine;
a turbocharger comprising a compressor and a turbine;
an EGR valve with first and second outlets supplying exhaust to downstream and upstream of the compressor, respectively; and
a controller providing torque compensation via spark timing adjustment during an EGR valve state change from the first outlet solely supplying the exhaust to the second outlet solely supplying the exhaust.
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Abstract
A system and method for delivering EGR to an internal combustion engine is presented. The system can reduce system cost and lower system complexity.
7 Citations
20 Claims
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1. A system for providing EGR to an engine, comprising:
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an engine; a turbocharger comprising a compressor and a turbine; an EGR valve with first and second outlets supplying exhaust to downstream and upstream of the compressor, respectively; and a controller providing torque compensation via spark timing adjustment during an EGR valve state change from the first outlet solely supplying the exhaust to the second outlet solely supplying the exhaust. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system, comprising:
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an engine having an exhaust duct and an intake duct; a turbocharger having a compressor and turbine, the turbocharger coupled to the engine by way of the exhaust duct and the intake duct; an EGR valve configured such that an inlet of the EGR valve is in communication with the exhaust duct upstream of the turbocharger and such that a first outlet of the EGR valve is in communication with the intake duct downstream of the compressor, and such that a second outlet of the EGR valve is in communication with the intake duct upstream of the compressor, the EGR valve including a zero flow position; and a controller that adjusts a position of the EGR valve in response to a pressure differential between an intake manifold and the exhaust duct. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An EGR delivery method, comprising:
adjusting an EGR valve to; a first position to deliver exhaust gases only upstream of a compressor at a first pressure differential between an engine intake manifold and an engine exhaust duct;
thena zero flow position; and
thena second position to deliver exhaust gases only downstream of the compressor at a second pressure differential between the engine intake manifold and the engine exhaust duct. - View Dependent Claims (18)
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19. An EGR delivery method, comprising:
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adjusting an EGR valve position so that EGR flows into an engine intake at a first position upstream of a compressor during low engine speed and high engine torque; adjusting the EGR valve position to a zero flow position; and
thenadjusting the EGR valve position so that EGR flows into the intake at a second position downstream of the compressor during high engine speed or low engine torque. - View Dependent Claims (20)
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Specification