Title:
INSULATION RESISTANCE DETERMINING SYSTEM, INSULATION RESISTANCE DETERMINING APPARATUS AND INSULATION RESISTANCE DETERMINING METHOD
Document Type and Number:
WIPO Patent Application WO/2008/016179
Kind Code:
A1
Abstract:
An insulation resistance determining system (50) comprises an insulation resistance determining
part configured by connecting a coupling capacitor (52), a detection resistor
(54) and a pulse oscillating circuit (56) in series with a common mode potential
measuring point (30); and an insulation resistance judging part having a filter
(58), which processes an AC signal (vx) at a junction between the coupling
capacitor (52) and the detection resistor (54), an amplifier (60), a wave-height
value determining circuit (62) and a control part (70). The control part (70)
has functions to detect an insulation resistance reduction in response to an
output of the wave-height value determining circuit (62); to request an HVCPU
(40) to vary the common mode potential so as to determine a failure of the insulation
resistance determining part; and to determine a failure of the insulation resistance
judging part from an output change of the wave-height value determining circuit
(62) between before and after the common mode potential variation.
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Inventors:
TACHIZAKI SHINSUKE (JP)
Application Number:
PCT/JP2007/065565
Publication Date:
February 07, 2008
Filing Date:
August 02, 2007
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
TACHIZAKI SHINSUKE (JP)
TACHIZAKI SHINSUKE (JP)
International Classes:
G01R27/02; B60L3/00; G01R31/02
Foreign References:
| JP2005012858A | 2005-01-13 | |||
| JP2005233822A | 2005-09-02 | |||
| JP2004347372A | 2004-12-09 |
Attorney, Agent or Firm:
YOSHIDA, Kenji et al. (Kichijoji-honcho 1-chomeMusashino-shi, Tokyo, JP)
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