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Calibration strategies to improve spinel mixed metal oxides catalytic converters

  • US 9,951,706 B2
  • Filed: 04/21/2015
  • Issued: 04/24/2018
  • Est. Priority Date: 04/21/2015
  • Status: Active Grant
First Claim
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1. A method for optimizing the air to fuel ratio (AFR) of an engine using a transient drive cycle testing protocol, the method comprising:

  • providing from a combustion engine an exhaust flow exposed to a catalyst, wherein the catalyst comprises;

    a substrate,a washcoat layer deposited overlying the substrate, the washcoat layer comprising a support oxide, andan overcoat layer deposited overlying the washcoat, the overcoat layer comprising a spinel having the general formula;

    AxB3-xO4,where A and B are selected from the group consisting of Fe, Ni, Mn, Co, Cu, Al, Sr, and Zr, and x is a number from 0.1 to 2;

    testing the exhaust flow using a transient drive cycle testing protocol model comprising a plurality of urban driving cycle (UDC) phases having at least two idle phases;

    providing at least one target AFR value during each UDC phase;

    determining at least one modified AFR value during each UDC phase, wherein the at least one modified AFR value varies from the at least one target AFR; and

    adjusting one of the at least one target AFR value to correspond to one of the at least one modified AFR value during at least one of the at least two idle phases;

    wherein the at least one modified AFR value is indicative of at least one of a more lean or a more rich condition.

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