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, the system comprising:
- an internal combustion engine;
a turbocharger comprising a compressor and a turbine;
an EGR valve capable of directing exhaust gases from an engine'"'"'s exhaust to a location in an engine'"'"'s intake system upstream of the compressor or to a location in the engine'"'"'s intake system downstream of the compressor; and
a controller that provides torque compensation to the engine during an EGR valve state change from a condition solely supplying exhaust gases to downstream the compressor to solely supplying exhaust gases to upstream the compressor.
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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.
13 Citations
26 Claims
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1. A system for providing EGR to an engine, the system comprising:
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an internal combustion engine; a turbocharger comprising a compressor and a turbine; an EGR valve capable of directing exhaust gases from an engine'"'"'s exhaust to a location in an engine'"'"'s intake system upstream of the compressor or to a location in the engine'"'"'s intake system downstream of the compressor; and a controller that provides torque compensation to the engine during an EGR valve state change from a condition solely supplying exhaust gases to downstream the compressor to solely supplying exhaust gases to upstream the compressor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for providing EGR to an internal combustion engine, the system comprising:
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an internal combustion engine having an exhaust duct and an intake duct; a turbocharger having a compressor and turbine, the turbocharger coupled to the internal combustion 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; and a controller that adjusts a position of the EGR valve in response to a pressure differential. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An EGR delivery method, comprising:
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adjusting a position of an EGR valve to a first position to deliver exhaust gases upstream of a compressor at a first pressure differential between an engine intake manifold and an engine exhaust duct; and adjusting the position of the EGR valve to a second position to deliver exhaust gases downstream of the compressor at a second pressure differential between the engine intake manifold and the engine exhaust duct. - View Dependent Claims (18, 19, 20, 21)
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22. An EGR delivery method, comprising:
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adjusting a position of an EGR valve so that exhaust gas flows into an engine intake system to a first position upstream of a compressor during low engine speed and high engine torque; and adjusting the position of the EGR valve so that exhaust gas flows into the engine intake system to a second position downstream of the compressor during high engine speed or when engine torque is low. - View Dependent Claims (23, 24, 25, 26)
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Specification