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Control of engine exhaust backpressure following engine cold-start

  • US 10,066,561 B2
  • Filed: 04/27/2016
  • Issued: 09/04/2018
  • Est. Priority Date: 04/27/2016
  • Status: Active Grant
First Claim
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1. A method of controlling a rate of warm-up of an internal combustion engine having a variable geometry turbocharger (VGT) including a compressor and a turbine with adjustable vanes fluidly connected to an exhaust system, the method comprising:

  • identifying, via a controller, a cold-start of the engine;

    regulating, via the controller, in response to the identified cold-start of the engine, an exhaust pressure modulation (EPM) valve arranged in a main exhaust passage of the exhaust system, wherein the main exhaust passage channels engine exhaust gas to the ambient, to restrict a flow of the engine exhaust gas to the ambient and increase exhaust gas backpressure in the main exhaust passage up to a predetermined pressure value to thereby increase a load on and the rate of warm-up of the engine;

    regulating, via the controller, a low pressure exhaust gas recirculation (LPEGR) valve to selectively control flow of the engine exhaust gas through an LPEGR passage following said regulating the EPM valve in response to the identified cold-start of the engine,whereinthe LPEGR passage fluidly connects the main exhaust passage to the engine, andthe LPEGR valve is arranged in the LPEGR passage;

    determining ambient temperature via a sensor; and

    maintaining the LPEGR valve in a fully-closed state, via the controller, to minimize condensation of moisture in the exhaust gas at the turbine of the VGT when the ambient temperature has been determined to be below −

    10 degrees Celsius.

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