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Control for improved vehicle performance

  • US 6,490,856 B2
  • Filed: 06/07/2002
  • Issued: 12/10/2002
  • Est. Priority Date: 03/17/2000
  • Status: Expired due to Term
First Claim
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1. A method for controlling an engine coupled to an emission control device susceptible to reversible contamination, the emission control device capable of storing and releasing an emission substance, the engine capable of lean of stoichiometry, the method comprising;

  • determining a present fuel savings of operating the engine at a first operating condition where the engine is operated with a lean air-fuel ratio and wherein the emission control operates at its present condition;

    determining a potential fuel savings of operating the engine at said first operating condition where the engine is operated with said lean air-fuel ratio and wherein the emission control operates at a decontaminated condition; and

    determining a fuel loss of performing a decontamination cycle; and

    performing said decontamination cycle in response to at least said present fuel savings, said potential fuel savings, and said fuel loss.

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