Determining the source of a ground offset in a controller area network
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
Disclosed herein are a system and a related computer-executed method of locating a source of a ground offset in a network of electronic devices interconnected by a communication bus. An exemplary method detects signal voltages on the communication bus that are indicative of a ground offset condition, and saves voltage timestamps for the detected signal voltages such that each detected signal voltage has a respective voltage timestamp. Message timestamps are added to messages on the communication bus, such that each message has a respective message timestamp. The message timestamps are compared against the voltage timestamps to identify at least one of the electronic devices as a ground offset source.
-
Citations
14 Claims
-
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 Dependent Claims (2, 3, 4, 5)
-
-
6. A system for diagnosing a controller area network (CAN) onboard a host vehicle, the CAN comprising a plurality of electronic control units (ECUs) interconnected by a CAN communication bus, the system comprising:
-
a processor device; and a storage medium associated with the processor device, the storage medium comprising processor-executable instructions that, when executed by the processor device, are capable of performing a method of locating a source of a ground offset in the CAN, the method comprising; detecting, by the processor device, signal voltages on the CAN 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 CAN 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 a particular message and a corresponding voltage timestamp is less than a threshold time value; identifying, by the processor device, at least one of the ECUs 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 Dependent Claims (7, 8, 9, 10)
-
-
11. A tangible and non-transitory computer readable storage medium having executable instructions stored thereon that, when executed by a processor device, are capable of performing a 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 the 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 that is indicative of a ground offset condition and a particular message, wherein the comparing comprises determining whether a difference in time between a particular message timestamp for a 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 Dependent Claims (12, 13, 14)
-
Specification