Method and device for diagnosis for vehicle

G - Physics – 01 – M

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Details

G01M 17/00 (2006.01) G01M 15/05 (2006.01)

Patent

CA 2248831

A method and device for examining in cycles a vehicle about a plurality of diagnosis items including diagnosis items which utilize forced operation signals. A forced operation signal supply means (550) supplies a forced operation signal (Sx) to a diagnosis object (101) through an ECU (1). A diagnosing means (553) examines the object (101) by comparing the present state of the object (101) sensed by a vehicle state sensing means (552) with the predicted state of the object (101) when the forced operation signal (Sx) is supplied to it. When the state of the object (101) is judged to be good, or a predetermined time has elapsed after the start of the supply of the signal (Sx), a supply stopping means (555) commands the forced operation signal supply means (550) to stop the supply of the forced operation signal (Sx).

L'invention concerne un procédé et un système pour inspecter en circuit un véhicule en vue de détecter des défauts sur une série d'éléments, y compris des éléments mettant en oeuvre des signaux de fonctionnement forcé. Un dispositif de transmission (550) de signal de fonctionnement forcé transmet un signal de fonctionnement forcé (Sx) à un élément à inspecter (101) par l'intermédiaire d'un ECU (1). Un dispositif de détection des défauts (553) examine l'élément (101) en comparant l'état présent de l'élément (101) (évalué au moyen d'un dispositif d'inspection de l'état d'un véhicule (552)) avec l'état prévu de l'élément (101) lorsque le signal de fonctionnement forcé (Sx) lui est transmis. Si l'état de l'élément (101) est jugé satisfaisant, ou si un laps de temps préétabli s'est écoulé après le début de transmission du signal (Sx), un dispositif d'arrêt de la transmission (555) donne instruction au dispositif de transmission (550) de signal de fonctionnement forcé pour interrompre la transmission du signal de fonctionnement forcé (Sx).

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