Method and apparatus for isolating a fault in a controller area network
First Claim
1. A method for monitoring a controller area network (CAN) on a mobile system comprising a plurality of linked nodes including an on-board monitoring controller, comprising:
- identifying communications links and associated nodes between the nodes of the CAN;
ranking the communications links according to their order of connection to the monitoring controller, including assigning lower ranks to ones of the communications links proximal to the monitoring controller and assigning higher ranks to ones of the communications links distal to the monitoring controller;
for each of the communications links, identifying which of the associated nodes is distal to the monitoring controller; and
determining, using the monitoring controller, a fault signature for each of the communications links based upon the identified node distal to the monitoring controller for each of the communications links.
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Abstract
A method for monitoring controller area network (CAN) on a mobile system includes identifying links and associated nodes between all the nodes of the CAN, and ranking all the links according to their order of connection to the monitoring controller, including assigning lower ranks to ones of the links proximal to the monitoring controller and assigning higher ranks to ones of the links distal to the monitoring controller. For each of said links, the associated node distal to the monitor is identified. The on-board monitoring controller determines a fault signature for each of the links starting with the link having the highest ranking, said fault signature comprising identified ones of the associated nodes distal to the monitor for each of the corresponding links.
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Citations
12 Claims
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1. A method for monitoring a controller area network (CAN) on a mobile system comprising a plurality of linked nodes including an on-board monitoring controller, comprising:
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identifying communications links and associated nodes between the nodes of the CAN; ranking the communications links according to their order of connection to the monitoring controller, including assigning lower ranks to ones of the communications links proximal to the monitoring controller and assigning higher ranks to ones of the communications links distal to the monitoring controller; for each of the communications links, identifying which of the associated nodes is distal to the monitoring controller; and determining, using the monitoring controller, a fault signature for each of the communications links based upon the identified node distal to the monitoring controller for each of the communications links. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An on-vehicle method for monitoring a controller area network (CAN) including a plurality of linked communication nodes, comprising:
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identifying communication links between the linked communication nodes of the CAN including an on-board monitoring controller; identifying pairs of the communications nodes associated with each of the communication links; identifying which of the associated communication nodes is distal to the monitoring controller for each communication link; ranking the communication links according to their order of connection to the monitoring controller, including assigning lower ranks to the communication links proximal to the monitoring controller and assigning higher ranks to the communication links distal to the monitoring controller; and determining, using the monitoring controller, a fault signature for each of the communication links starting with the communication link having the highest ranking, said fault signature comprising identified ones of the associated communication nodes distal to the monitoring controller for each of the corresponding communication links. - View Dependent Claims (9, 10, 11, 12)
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Specification