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Dedicated exhaust gas recirculation control systems and methods

  • US 9,957,911 B2
  • Filed: 02/18/2016
  • Issued: 05/01/2018
  • Est. Priority Date: 02/18/2016
  • Status: Active Grant
First Claim
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1. An engine control system of a vehicle, comprising:

  • a fuel control module that controls fuel injection of a first cylinder of an engine based on a first target air/fuel ratio that is fuel lean relative to a stoichiometric air/fuel ratio and that controls fuel injection of a second cylinder of the engine based on a second target air/fuel ratio that is fuel rich relative to stoichiometry,wherein the first cylinder outputs exhaust to a first three way catalyst (TWC), andwherein the second cylinder outputs exhaust to an exhaust gas recirculation (EGR) valve; and

    an EGR control module that controls opening of the EGR valve to;

    (i) a second TWC that reacts with nitrogen oxides (NOx) in the exhaust and outputs ammonia to a selective catalytic reduction (SCR) catalyst;

    (ii) a conduit that recirculates exhaust back to an intake system of the engine at a location downstream of a compressor of a turbocharger; and

    (iii) the first TWC.

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