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System and method for relieving engine back-pressure by selectively bypassing a stage of a two-stage turbocharger during non-use of EGR

  • US 7,000,393 B1
  • Filed: 04/14/2005
  • Issued: 02/21/2006
  • Est. Priority Date: 04/14/2005
  • Status: Active Grant
First Claim
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1. A control system for an internal combustion engine that has an intake system including a turbocharger compressor for developing combustion charge air for the engine, combustion chambers where charge air and fuel are combusted to operate the engine, an exhaust system through which exhaust gas resulting from combustion pass from the combustion chambers, including a turbocharger turbine that uses exhaust gas to operate the turbocharger compressor, an EGR system for recirculating some exhaust gas from the exhaust system to the intake system, and a valve for selectively shunting exhaust gas around a stage of the turbine, the control system comprising:

  • a processor for processing data to selectively render the EGR system active and inactive and to develop a value for a set-point of operation for the valve defining the extent to which the valve shunts exhaust gas around the turbine stage, a first map set containing set-point data based on the EGR system being active and a second map set containing set-point data based on the EGR system being inactive, wherein the processor processes data selected from the first map set and not from the second map set to develop the set-point value when the EGR system is active, and processes data selected from the second map set and not from the first map set to develop the set-point value when the EGR system is inactive.

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