| 摘要 |
PROBLEM TO BE SOLVED: To predict failures by using the response time of each ECU (Electronic Control Unit) for performing measurement inside a self vehicle without referring to similar failure information by communicating with the outside of the vehicle. SOLUTION: An integral ECU for measuring failures is connected to a plurality of electronic control units via a communication line 30. The integral ECU includes: a transmission/reception part 11 for transmitting a transmission message ms for detecting a time for going back and forth to another ECU and receiving a message returned by the ECU; a response time clocking part 12 for clocking a response time between the transmission time of the transmission message and the reception time; an arithmetic operation processing part 14 for setting the threshold of a response time of each ECU when a vehicle starts; and a determination processing part 13 for transmitting a message to another ECU cyclically after the start to predict the failure of the ECU by using the response time and the threshold. A real clocking difference accumulated value is obtained from the absolute value of a difference between response times and initial values of the response times, an expected difference accumulated value is obtained by a method of least squares by using the real clocking difference accumulated value, and the threshold has a prescribed width from the expected difference accumulated value. COPYRIGHT: (C)2009,JPO&INPIT
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