State detecting method and insulation resistance fall detector

Details State detecting method and insulation resistance fall detector State detecting method and insulation resistance fall detector

2006-03-14

2006-03-14

Nguyen, Vincent Q. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S503000, C324S509000, C324S551000, C340S647000

Reexamination Certificate

active

07012435

ABSTRACT:
A method of detecting a state of an insulation resistance fall detector that includes: a detection resistance connected in series to an insulation resistance between a vehicle body and a power source; a condenser provided between the insulation resistance and the detection resistance; a pulse signal applying unit that applies a pulse signal to a serial circuit constituted by the insulation resistance, the condenser and the detection resistance; a low pass filter that filters a voltage of a connecting point between the coupling condenser and the detection resistance; and a fall detecting unit that detects a fall of the insulation resistance on the basis of the output of the filter, the method comprising the steps of: varying a pulse width of the pulse signal; and detecting the state of the insulation resistance fall detector on the basis of the output of the filter when the pulse width is varied.

REFERENCES:
patent: 6906525 (2005-06-01), Suzuki
patent: 8-70503 (1996-03-01), None

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