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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	YAMAMOTO, TADAHIRO, OHTA, TADAKI, OHNISHI, EIICHI, OHSUGA, MINORU, OHGANE, HIROAKI, OYAMA, YOSHISHIGE
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	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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Beschreibung
Zusammenfassung:	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.