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On-board gas composition sensor for internal combustion engine exhaust gases

  • US 5,490,490 A
  • Filed: 04/27/1995
  • Issued: 02/13/1996
  • Est. Priority Date: 04/27/1995
  • Status: Expired due to Fees
First Claim
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1. An on-board gas composition sensor for an internal combustion engine, for monitoring oxygen content in exhaust gas from the internal combustion engine, the gas composition sensor comprising, in combination:

  • light source means for generating excitation light in a preselected wavelength range;

    sensor means comprising a sensor body of porous high-temperature fluorescent inorganic oxide ceramic, for emitting an optical fluorescence signal responsive to oxygen content in the exhaust gas upon exposure of the sensor body to the excitation light at 400°

    -650°

    C.; and

    fluorescence detector means for receiving a preselected wavelength range of the optical fluorescence signal which is above the excitation light wavelength range, and for generating an exhaust gas oxygen content output signal in response to the optical fluorescence signal.

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