A method and a system for detecting an adhesion of a relay are disclosed. In a high voltage circuit, a voltage (U3) is measured across a load multiple times within a specified time period when a first relay (K1) and a second relay (K3) are open and a third relay (K2) is closed, where the second relay is a main negative relay of the high voltage circuit. The second relay is declared to have an adhesion malfunction when a change in the value of the measured load voltage satisfies a specified condition. Using the change in the sampled load voltages external to the main negative relay, the adhesion malfunction of the main negative relay is diagnosed, so that corrective action may be taken. The potential safety hazard caused by the adhesion malfunction of the main negative relay may be prevented, such as may occur in an electric vehicle high voltage circuit.
METHOD AND SYSTEM FOR DETECTING RELAY ADHESION
VERFAHREN UND SYSTEM ZUR ERKENNUNG VON RELAISHAFTUNG
PROCÉDÉ ET SYSTÈME POUR DÉTECTER UN COLLAGE DE RELAIS
2024-07-03
Patent
Electronic Resource
English
IPC: | G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01H Elektrische Schalter , ELECTRIC SWITCHES / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |