Method and apparatus for short fault detection in a controller area network

• US 9,678,847 B2
• Filed: 05/22/2015
• Issued: 06/13/2017
• 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: Zhang, Yilu, Du, Xinyu, Nagose, Atul, Wienckowski, Natalie Ann, Jiang, Shengbing
• Primary Examiner(s): Patel, Kamini
• Application Number:
  US14/720,332
• Publication Number:
  US 20150347258A1
• Time in Patent Office: 753 Days
• Field of Search: 714 45
• 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 transceiver signally connected to the CAN-H wire through a shunt resistor having a known resistance,

a CAN-H wire voltage monitor to monitor CAN-H voltage,

a CAN-L wire voltage monitor to monitor CAN-L voltage,

a shunt resistor voltage monitor to monitor voltage across said shunt resistor,

a processor and memory, to;

calculate a total resistance of the CAN bus in accordance with the following relationship;

2. The controller area network (CAN) of claim 1, wherein determine a location of said wire short fault in the CAN bus comprises:

reference a predetermined table correlating CAN bus location to said total resistance of the CAN bus.

3. The controller area network (CAN) of claim 1, wherein said voltages are filtered.