Title:
APPARATUS FOR CONTROLLING ELECTRIC CAR
Document Type and Number:
WIPO Patent Application WO/1992/012873
Kind Code:
A1
Abstract:
An apparatus for controlling electric car equipped with at least two induction motors (4a-4d) for driving the electric car. The individual motors are connected with variable-voltage variable-frequency inverters (3a-3d) combined with tacho-generators (5a-5d), respectively, to constitute a plurality of drive control units (A-D). And the inverters (3a-3d) of the drive control units (A-D) are all controlled by an integral controller (1). This apparatus for controlling a car includes torque reduction control means for reducing the torque of a predetermined one of the induction motors (4a-4d) by a predetermined value from the command value of the corresponding drive control unit. Frequencies of the inverters of the remaining drive control units are controlled based on the frequency of rotational speed obtained from the tacho-generator of the above drive control unit.
Inventors:
OKAMATSU SHIGETOSHI (JP)
Application Number:
PCT/JP1992/000040
Publication Date:
August 06, 1992
Filing Date:
January 20, 1992
Export Citation:
Assignee:
HITACHI LTD (JP)
International Classes:
B60L9/18; B60L3/10; B60L9/22; H02P5/50; (IPC1-7): B60L9/18
Foreign References:
| JPS5451110A | 1979-04-21 | |||
| JPS55127806A | 1980-10-03 | |||
| JPS59136004A | 1984-08-04 |
Other References:
See also references of EP 0521162A4
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