Method of diagnosing main relay by use of electronic control...

Details Method of diagnosing main relay by use of electronic control... Method of diagnosing main relay by use of electronic control...

2006-05-10

2008-11-04

DeBeradinis, Robert L. (Department: 2836)

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

Reexamination Certificate

active

07446428

ABSTRACT:
The electronic control unit includes a control section monitoring a manipulation of an ignition switch of a vehicle, and a timer section for automatically starting up the control section. The electronic control unit is provided with a fault diagnosis function of monitoring, by use of the control section being supplied with electric power through a main relay, a time elapsed since the control section outputs a stop command commanding the main relay to change to the off state, and diagnosing that the main relay is in a fault state where the main relay cannot be controlled to the off state when the monitored time exceeds a threshold time predetermined on the basis of a response time needed for the main relay to change from the on state to the off state in response to the stop command.

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EPO Search Report dated Jul. 24, 2006.
Communication dated Jun. 4, 2008 issued in European Application No. 06 009 698.9.

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