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Title:
VEHICLE DRIVING DEVICE AND RESISTOR-DISCONNECTION DETECTION METHOD IN VEHICLE DRIVING DEVICE
Document Type and Number:
Japanese Patent JP2009148095
Kind Code:
A
Abstract:

To detect resistor disconnection without enlarging a circuit scale.

Output of a main power generator 2 is converted into a DC current by a commutator 3 and a smoothing capacitor 4 so as to drive an AC electric motor 6 by converting the DC current into an AC current by an inverter 5. An output of the commutator 3 is provided with resistors 10a, 10b connected in parallel via a switch 9. A vehicle driving device is provided with a current detector 11 for detecting a current flowing in the switch 9, and a voltage detector 12 for detecting a voltage across the capacitor 4. A current value detected by the current detector 11 is supplied to a low-pass filter 13 so as to extract a low-frequency component. A divider 14 divides a signal detected by the voltage detector 12 by an output signal of the low-pass filter 13. A multiplier 15 multiplies the output of the divider 14 by a value 16 obtained by detecting ON-duty of the switch 9. A comparator 18 compares the output of the multiplier 15 with a reference voltage generated by a reference-voltage generator 17.


Inventors:
SHIMADA KEIZO
SUGAWARA NAOSHI
FUJIMOTO TETSUHIRO
Application Number:
JP2007323786A
Publication Date:
July 02, 2009
Filing Date:
December 14, 2007
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
B60L3/00; B60L7/06; B60L50/15; H02P3/18; H02P27/06
Domestic Patent References:
JP2006230084A2006-08-31
JP2001136602A2001-05-18
JP2002315352A2002-10-25
JP2007215339A2007-08-23
JP2005027454A2005-01-27
JPH08144792A1996-06-04
JP2008005660A2008-01-10
JP2008295143A2008-12-04
Attorney, Agent or Firm:
Yoshitsuno Kakuda