Malfunction diagnosis system and method for on-vehicle...

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G01R 31/317 (2006.01) B60R 16/02 (2006.01) G01R 31/00 (2006.01) G05B 23/02 (2006.01)

Patent

CA 2198501

A diagnosis system for diagnosing malfunctions of on-vehicle electronic control units (ECU) includes a plurality of ECUs and a diagnostic tester. The ECUs are connected to one another, thereby forming a communications network. The ECUs store a data related to malfunctions. A diagnostic tester is connected to an engine ECU for reading the data stored in the ECUs. The tester transmits an initialization signal at a low speed to the ECU when starting communicating with one of the ECUs. The ECU selects a transmission rate between the ECU and the tester based on the initialization signal.

ystème pour diagnostiquer les défaillances de dispositifs de commande électronique embarqués (ECU), comprenant un certain nombre d'ECU et un banc de diagnostic. Les ECU sont raccordés les uns aux autres, formant ainsi un réseau de communication. Ils stockent des données relatives aux défaillances. Un banc de diagnostic est raccordé à un ECU moteur pour lire les données stockées dans les ECU. Le banc de diagnostic envoie un signal d'initialisation de faible vitesse à l'ECU au moment de l'entrée en communication avec un des ECU. L'ECU choisit une vitesse pour la transmission entre l'ECU et le banc de diagnostic en fonction du signal d'initialisation.

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