Air/fuel ratio detecting apparatus for internal combustion...

G - Physics – 01 – F

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354/24, 123/61

G01F 9/00 (2006.01) F02D 35/00 (2006.01) F02D 41/00 (2006.01) F02D 41/14 (2006.01) G01N 27/406 (2006.01)

Patent

CA 1256998

- 1 - Abstract In an A/F ratio sensor of the mixture supplied to an internal combustion engine has a detector for detecting the concentration of residual oxygen in the exhaust gas. The apparatus determines the A/F ratio by retrieving an air excess ratio table with an output of the detector. A device introduces a predetermined quantity of additional air into the engine for a certain period of time, with the velocity of air flowing through the throttle valve being equal to the sonic velocity. The oxygen concentration detector is calibrated by a comparison of the outputs thereof before and after introduction of the additional air. In this manner the A/F ratio of the mixture can be detected accurately without being influenced by any age deterioration of the oxygen concentration detector.

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