METHOD AND APPARATUS FOR SHORT FAULT DETECTION IN A CONTROLLER AREA NETWORK

• US 20150347258A1
• Filed: 05/22/2015
• Published: 12/03/2015
• Est. Priority Date: 05/27/2014
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: DU, XINYU, JIANG, SHENGBING, ZHANG, YILU, WIENCKOWSKI, NATALIE ANN, NAGOSE, ATUL
• Granted Patent: US 9,678,847 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 11/0739 in a data processing system embedded in automotive or aircraft systems
• CPC Class Codes: G06F 11/0751 Error or fault detection not based on redundancy power supply failures G06F1/30; network fault management H04L41/06
• CPC Class Codes: G06F 11/2007 using redundant communication media
• CPC Class Codes: G06F 11/3013 where the computing system is an embedded system, i.e. a combination of hardware and software dedicated to perform a certain function in mobile devices, printers, automotive or aircraft systems testing or monitoring of control systems or parts thereof G05B23/02
• CPC Class Codes: G06F 11/3027 where the computing system component is a bus
• CPC Class Codes: G06F 11/3062 where the monitored property is the power consumption power management in a computing system G06F1/3203

Abstract

A controller area network (CAN) includes a CAN bus having a CAN-H wire, a CAN-L wire, and a pair of CAN bus terminators located at opposite ends of the CAN bus. The CAN further includes a plurality of nodes including controllers wherein at least one of the controllers is a monitoring controller. The monitoring controller includes a CAN monitoring routine for detecting a wire short fault in the CAN bus and its location.

Claims

1. A controller area network (CAN) comprising:

a CAN bus including a CAN-H wire and a CAN-L wire;

a pair of CAN bus terminators located at opposite ends of the CAN bus, each terminator having a corresponding known terminator resistance value;

a plurality of nodes including controllers wherein at least one of said controllers comprises a monitoring controller; and

said monitoring controller comprising a CAN monitoring routine, comprising the following steps;

detecting a wire short fault in the CAN bus; and

determining a location of said wire short fault in the CAN bus.

2. The controller area network (CAN) of claim 1, wherein the step of detecting a wire short fault in the CAN bus comprises the following steps:

measuring a first voltage across a known resistance through which a CAN bus current passes;

measuring a second voltage between the CAN-H wire and the CAN-L wire; and

detecting the wire short fault in the CAN bus based upon said first and second voltages.

3. The controller area network (CAN) of claim 1, wherein the step of determining a location of said wire short fault in the CAN bus comprises the following steps:

measuring a first voltage across a known resistance through which a CAN bus current passes;

measuring a second voltage between the CAN-H wire and the CAN-L wire;

determining a CAN bus resistance as a function of the first voltage, the second voltage, and the known resistance; and

referencing a predetermined table correlating CAN bus location to the CAN bus resistance.

4. The controller area network (CAN) of claim 2, wherein the step of determining a location of said wire short fault in the CAN bus comprises the following steps:

determining a CAN bus resistance as a function of the first voltage, the second voltage, and the known resistance; and

referencing a predetermined table correlating CAN bus location to the CAN bus resistance.

5. The controller area network (CAN) of claim 2, wherein the steps of measuring the first and second voltages comprises filtering the voltages.

6. The controller area network (CAN) of claim 1, wherein the steps of detecting a wire short fault in the CAN bus and determining a location of said wire short fault in the CAN bus comprise the steps:

measuring a first voltage across a known resistance through which a CAN bus current passes;

measuring a second voltage between the CAN-H wire and the CAN-L wire;

detecting the wire short fault in the CAN bus based upon said first and second voltages;

determining a CAN bus resistance as a function of the first voltage, the second voltage, and the known resistance; and

referencing a predetermined table correlating CAN bus location to the CAN bus resistance.

7. The controller area network (CAN) of claim 2, wherein the step of detecting the wire short fault in the CAN bus based upon said first and second voltages comprises determining said first and second voltage to be outside of a predetermined range.

8. A controller area network (CAN) comprising:

a CAN bus including a CAN-H wire and a CAN-L wire;

a pair of CAN bus terminators located at opposite ends of the CAN bus, each terminator having a corresponding known terminator resistance value;

a plurality of nodes including controllers wherein at least one of said controllers comprises a monitoring controller; and

said monitoring controller comprising a CAN monitoring routine, comprising the following steps;

measuring a first voltage across a known resistance through which a CAN bus current passes;

measuring a second voltage between the CAN-H wire and the CAN-L wire;

detecting a wire short fault in the CAN bus when the first and second voltages are outside of a predetermined range;

determining a CAN bus resistance as a function of the first voltage, the second voltage, and the known resistance; and

localizing the wire short fault by referencing a predetermined table correlating CAN bus location to the CAN bus resistance.