Measuring an extended range of air fuel ratio

Details Measuring an extended range of air fuel ratio Measuring an extended range of air fuel ratio

G - Physics

01

N

324/25

G01N 27/46 (1985.01)

Patent

CA 1212415

-30- ABSTRACT OF THE DISCLOSURE A method of using selected portions of an exhaust gas sensor (110) having a substantially enclosed volume, v, between two electrochemical cells (111, 121). One electrochemical cell (111) is exposed to an exhaust gas and another electrochemical cell (121) is exposed to a reference atmosphere. An air/fuel ratio rich of stoichiometry uses electrochemical cell (121) as an oxygen pump, electrochemical cell (111) as a voltage generator, and the reference atmosphere as a source of oxygen. An air/fuel ratio lean of stoichiometry uses electrochemical cell (121, or 111) as an oxygen pump, electrochemical cell (111, or 121) as a voltage generator, and the ambient adjacent the oxygen pump as a sink of oxygen. An air/fuel ratio at stoichiometry uses electrochemical cell (121) as a voltage generator.

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