Method for detecting failure of a relay

Details Method for detecting failure of a relay Method for detecting failure of a relay

2005-06-21

2005-06-21

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Internal-combustion engine ignition system or device

Electronic ignition system

C324S418000

Reexamination Certificate

active

06909285

ABSTRACT:
A method for detecting failure of a relay operating in a vehicle having an ignition switch, a power supply, a capacitor, and a pre-charge circuit to pre-charge the capacitor with the relay switching power from the power supply to the pre-charged capacitor, the method comprising the steps of: performing a capacitor pre-charge test; and performing a capacitor discharge test. Preferably, the capacitor pre-charge test is performed when the ignition is switched ON and the capacitor discharge test is performed when the ignition is switched OFF.

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Combined Search and Examination Report dated Dec. 15, 2003 for Gt. Britain Application No. 0319724.1, entitled Power Relay Proveout (3 pages).

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