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Gas composition sensor and method for separately detecting components of exhaust gas to diagnose catalytic converter performance

  • US 5,889,196 A
  • Filed: 01/06/1997
  • Issued: 03/30/1999
  • Est. Priority Date: 01/05/1996
  • Status: Expired due to Fees
First Claim
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1. A gas composition sensor for detecting oxygen, hydrocarbon-group fuel, or a combusted composition, comprising a pair of sensing elements, each having a zirconia solid electrolyte body, a concentration cell composed of a platinoid metal catalytic detecting electrode and a reference electrode opposite to each other, and a gas diffusion limiting member coating said detecting electrode,a heater for setting, in substantially the same time phase, both of said sensing elements to operating temperatures different from each other for said sensing elements to have sensitivity coefficients to specified gas components different from each other, said sensing elements being operatively arranged and operable to selectively detect a specified gas component by way of said sensing elements having the different sensitivity coefficients.

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