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Method and system for control of an EGR valve during lean operation in a boosted engine system

  • US 9,074,541 B2
  • Filed: 10/25/2013
  • Issued: 07/07/2015
  • Est. Priority Date: 10/25/2013
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • while operating an engine with an air-fuel ratio adjusted to be leaner than stoichiometry, in response to exhaust air-fuel ratio being leaner than a threshold, closing an EGR valve, the threshold increased as an engine speed and load increases.

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