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1. WO2002001698 - ALTERNATOR TESTING METHOD AND SYSTEM USING RIPPLE DETECTION

Publication Number WO/2002/001698
Publication Date 03.01.2002
International Application No. PCT/US2001/020187
International Filing Date 26.06.2001
Chapter 2 Demand Filed 10.01.2002
IPC
G01R 31/34 2006.1
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
34Testing dynamo-electric machines
CPC
G01R 23/14
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
23Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
02Arrangements for measuring frequency, e.g. pulse repetition rate
14by heterodyning; by beat-frequency comparison
G01R 31/006
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
005Testing of electric installations on transport means
006on road vehicles, e.g. automobiles or trucks
G01R 31/343
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
34Testing dynamo-electric machines
343in operation
Applicants
  • SNAP-ON TECHNOLOGIES, INC. [US]/[US]
Inventors
  • THIBEDEAU, Dennis, G.
  • FAEHNRICH, Richard, J.
  • BROTT, Alejandro, P.
  • GOETZELMANN, Alan, D.
  • WILLEMS, Paul, A.
Agents
  • BECKER, Stephen, A.
Priority Data
60/214,25426.06.2000US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) ALTERNATOR TESTING METHOD AND SYSTEM USING RIPPLE DETECTION
(FR) PROCEDE ET SYSTEME D'EVALUATION DU FONCTIONNEMENT D'UN ALTERNATEUR DANS LESQUELS ON DETECTE LES ONDULATIONS RESIDUELLES
Abstract
(EN) A method and system for evaluating the operation of an alternator based on a frequency component in the alternator output signal. The method comprises detecting a frequency component of the alternator output signal, comparing the frequency component of the alternator output signal with a threshold frequency, and evaluating the operation of the alternator based on a result of the comparison. If the frequency component of the alternator output signal is lower than the threshold frequency, the alternator is determined as defective. The frequency component can be obtained by comparing the alternator output signal with an adaptive threshold. The adaptive threshold is generated based on the peak signal level and the valley signal level of the alternator output signal, such as the average of the peak signal level and valley signal level.
(FR) La présente invention concerne un procédé et un système qui permettent d'évaluer le fonctionnement d'un alternateur sur la base d'une composante de fréquence du signal de sortie de l'alternateur. Le procédé consiste à détecter une composante de fréquence du signal de sortie de l'alternateur, à comparer la composante de fréquence du signal de sortie de l'alternateur à un seuil de fréquence et à évaluer le fonctionnement de l'alternateur sur la base d'un résultat de la comparaison. Si la composante de fréquence du signal de sortie de l'alternateur est inférieure au seuil de fréquence, l'alternateur est estimé défectueux. Afin d'obtenir la composante de fréquence, le signal de sortie de l'alternateur est comparé à un seuil adaptatif qui est lui-même généré à partir du niveau de signal de crête et du niveau de signal de vallée du signal de sortie de l'alternateur, tels que la moyenne des niveaux de signaux de crête et de vallée.
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