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System for monitoring the efficiency of a catalyst, in particular for motor vehicles

  • US 5,627,757 A
  • Filed: 08/28/1995
  • Issued: 05/06/1997
  • Est. Priority Date: 09/14/1992
  • Status: Expired due to Fees
First Claim
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1. A system for measuring an efficiency of a catalyst through which gas flow is intended to pass, including at least two sensors such as lambda sensors which are disposed in use respectively upstream and downstream of said catalyst in the direction of the gas flow and which generate respective output signals, said system including:

  • first and second calculation means for calculating moving averages of the output signals;

    third and fourth calculation means each for calculating differences between instantaneous values of the output signals from one of said upstream or downstream sensors and said moving averages of the first and second calculation means, respectively, in order to generate difference signals;

    fifth calculation means for calculating output efficiency signals having values indicative of the efficiency of the catalyst on the basis of the difference signals or signals derived therefrom; and

    a warning unit, said warning unit responsive to values of said efficiency signals to generate a warning indicating when said catalyst is operating inefficiently.

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