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Method and system for catalyst temperature control

  • US 9,556,771 B2
  • Filed: 01/16/2013
  • Issued: 01/31/2017
  • Est. Priority Date: 01/16/2013
  • Status: Active Grant
First Claim
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1. A method for expediting activation of an exhaust catalyst coupled to an engine, comprising:

  • during a cold-start of the engine,closing an exhaust throttle, disposed downstream of the exhaust catalyst, and an EGR valve while diverting at least a portion of throttled exhaust gas through an EGR cooler and then through a bypass passage joined to an EGR passage at a junction,wherein the EGR cooler is coupled to an exhaust passage upstream of the throttle,wherein the EGR valve is coupled to the EGR passage downstream of the junction, andwherein the EGR cooler is in thermal communication with a coolant system, the coolant system in thermal communication with the engine.

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