Air-fuel ratio sensor trouble detecting apparatus

An air-fuel ratio sensor malfunction detecting apparatus detects the output signal periods of a first or upstream air-fuel ratio sensor, and compares them with a predetermined value to judge the first sensor to be malfunctioning when the periods are larger than the predetermined value. The apparatus...

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Bibliographische Detailangaben
Hauptverfasser:	OHUCHI, HIROFUMI
Format:	Patent
Sprache:	eng
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:	An air-fuel ratio sensor malfunction detecting apparatus detects the output signal periods of a first or upstream air-fuel ratio sensor, and compares them with a predetermined value to judge the first sensor to be malfunctioning when the periods are larger than the predetermined value. The apparatus also compares the magnitudes of air-fuel ratio control quantities from a second or downstream air-fuel ratio sensor with a predetermined value to judge the first sensor to be malfunctioning when the air-fuel ratio control quantities are larger than the predetermined value.