Patent ID: 9501347
Filing Date: 2016-11-22
CPC Classification: B60R,G05B,G06F

Claim Text:
1. A process for operating a communication network of a motor vehicle, wherein the communication network comprises a plurality of control devices which are connected to a data bus and exchange messages with one another via the data bus, wherein the plurality of control devices are connected to a voltage source, have a voltage measuring device that determines a voltage applied to their supply connections, and access a central fault memory and/or internal fault memory at least in a writing manner, in order to document therein information concerning a fault detected by the corresponding control device, wherein the process comprises the steps of: a) determining a global supply voltage of the voltage source; b) checking whether the determined global supply voltage exceeds a specified upper voltage threshold or falls below a specified lower voltage threshold; c) providing information representing the determined global supply voltage and/or the exceeding or falling-below thereof to the control devices; d) when a fault is detected by a respective control device, checking by use of the provided information whether the global supply voltage exceeds or falls below a respective one of the specified voltage thresholds; and e) when the global supply voltage exceeds or falls below the respective one of the specified voltage thresholds, writing into a fault memory by the respective control device when detecting the fault, information representing the exceeding or falling below the global supply voltage by the respective one of the specified voltage thresholds as a possible cause of the detected fault.