×

Determining the source of a ground offset in a controller area network

  • US 9,589,394 B2
  • Filed: 07/16/2015
  • Issued: 03/07/2017
  • Est. Priority Date: 07/16/2015
  • Status: Active Grant
First Claim
Patent Images

1. A computer-implemented method of locating a source of a ground offset in a network of electronic devices interconnected by a communication bus, the method comprising:

  • detecting, by a processor device, signal voltages on the communication bus that are indicative of a ground offset condition;

    saving, in a memory structure associated with the processor device, voltage timestamps for the detected signal voltages, each detected signal voltage having a respective voltage timestamp associated therewith;

    adding, by the processor device, message timestamps to messages on the communication bus, each message having a respective message timestamp associated therewith;

    comparing, by the processor device, the message timestamps against the voltage timestamps to identify messages corresponding to the detected signal voltages, wherein a message timestamp close in time to a voltage timestamp indicates a correlation between a detected signal voltage and a particular message, wherein the comparing comprises determining whether a difference in time between a particular message timestamp for the particular message and a corresponding voltage timestamp is less than a threshold time value;

    identifying, by the processor device, at least one of the electronic devices as a ground offset source, based on the comparing; and

    generating, by the processor device, an output including a diagnostic trouble code that indicates the at least one of the electronic devices identified as a ground offset source.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×