FAULT DIAGNOSIS APPARATUS AND FAULT DIAGNOSIS METHOD OF MULTI-CHANNEL ANALOG INPUT/OUTPUT CIRCUIT

A fault diagnosis apparatus and method capable of simultaneously detecting the fault of a multiplexer and the fault of an A/D converter and isolating and identifying causes of these faults, the multiplexer and the A/D converter being used in a multi-channel analog input/output circuit. Test-voltage...

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Bibliographische Detailangaben
Hauptverfasser:	ISHIKAWA, MASAKAZU, NISHIOKA, ATSUSHI, KAWAWA, FUJIYA, TANAKA, HIDECHIYO, TERAE, HISASHI, KUBOTA, MANABU, KIYOFUJI, YASUHIRO, KASAHARA, TAKENORI, FURUTA, YASUYUKI, YOSHIDA, KATSUMI, OOTANI, TATSUYUKI, NAGAYAMA, SYUICHI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CODE CONVERSION IN GENERAL CODING CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING DECODING ELECTRICITY FUNCTIONAL ELEMENTS OF SUCH SYSTEMS MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PHYSICS REGULATING TESTING
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Beschreibung
Zusammenfassung:	A fault diagnosis apparatus and method capable of simultaneously detecting the fault of a multiplexer and the fault of an A/D converter and isolating and identifying causes of these faults, the multiplexer and the A/D converter being used in a multi-channel analog input/output circuit. Test-voltage values are inputted from a diagnosis-voltage input unit into the multiplexer and the A/D converter constituting an analog-signal conversion unit, the multiplexer having plural channels, the A/D converter converting outputs from the multiplexer into digital signals, the test-voltage values being different from each other for each channel of the multiplexer. Comparisons are made between the digital voltage values and the test-voltage values inputted, the digital voltage values being outputted for each channel of the multiplexer. From this comparison result, it is judged whether the multiplexer is at fault or the A/D converter is at fault.