ABNORMALITY DETECTOR OF NETWORK SYSTEM FOR VEHICLE

Title:

ABNORMALITY DETECTOR OF NETWORK SYSTEM FOR VEHICLE

Document Type and Number:

Japanese Patent JP2002158668

Kind Code:

A

Abstract:

To properly detect a communication abnormality between ECUs over a network.

An ABS-ECU 12 and a transmission ECU 13 periodically transmit messages to an engine ECU 11 respectively. The engine ECU 11 detects abnormality of communication system, such as abnormality of the ABS-ECU 12, the transmission ECU 13 and disconnection abnormality of a communication line 14 as objects to be detected according to the reception state of the messages. Namely, the engine ECU 11 periodically receives the messages from the ABS-ECU 12 and the transmission ECU 13, and individually counts the number of times of reception. The counted number of times of reception is monitored in a cycle longer than a message receiving cycle from each of the ECUs 12, 13, and the abnormality of the communication system is detected by comparison between the number of times of reception and a prescribed judgment value.

Inventors:

OKUDA KAZUYUKI

Application Number:

JP2000351179A

Publication Date:

May 31, 2002

Filing Date:

November 17, 2000

Export Citation:

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Assignee:

DENSO CORP

International Classes:

B60R16/02; H04L1/24; H04L12/24; (IPC1-7): H04L12/28; B60R16/02

Attorney, Agent or Firm:

Hironobu Onda (1 person outside)

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