Device for sensing a fault current in a field bus system

Abstract

The invention relates to an electric switching circuit for operating a bus of a field bus system comprising means for sensing a fault current. Said means comprise first means for determining a first current of a first bus line, second means for determining a second current of a second bus line and means for detecting a fault based on the first current and the second current.

Description

technical field [0001] The invention relates to a switching circuit for detecting faults in a bus system and to a corresponding method. Background technique [0002] For communication between electronic controllers and for controlling and monitoring sensors and actuators in vehicles, bus systems such as the Controller-Area-Network (CAN), also referred to as CAN bus for short, are increasingly used today. In this case, a transmission of electrical signals is provided between the sending and receiving bus participants, which takes place via electronic lines. Such lines may be damaged during operation due to mechanical loads or other influences, which lead to failures during transmission. Damaged lines should no longer be used in bus systems, but conventional systems can only detect faults on bus system lines to a limited extent. A detected fault can therefore only be reacted to a limited extent (for example by disconnecting a damaged path). Conventional mechanisms for testi...

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Problems solved by technology

This has the obvious disadvantage that bus lines which tend to oscillate due to a certain line length cannot be reliably monitored for faults

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