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

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: NISHIOKA ATSUSHI, KASAHARA TAKENORI, OOTANI TATSUYUKI, KIYOFUJI YASUHIRO, KUBOTA MANABU, FURUTA YASUYUKI, YOSHIDA KATSUMI, NAGAYAMA SYUICHI, TANAKA HIDECHIYO, TERAE HISASHI, KAWAWA FUJIYA, ISHIKAWA MASAKAZU
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
CONTROL OR REGULATING SYSTEMS IN GENERAL
CONTROLLING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
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.