AIR/FUEL RATIO DETECTING APPARATUS FOR INTERNAL COMBUSTION ENGINES

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 p...

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Bibliographic Details
Main Authors YAMAMOTO, TADAHIRO, OHTA, TADAKI, OHNISHI, EIICHI, OHSUGA, MINORU, OHGANE, HIROAKI, OYAMA, YOSHISHIGE
Format Patent
LanguageEnglish
French
Published 04.07.1989
Edition4
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
LIGHTING
MEASURING
MECHANICAL ENGINEERING
PHYSICS
TESTING
WEAPONS
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Summary: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.
Bibliography:Application Number: CA19860519204