Title:
CONTROLLER OF ELECTRIC CAR
Document Type and Number:
WIPO Patent Application WO/1999/015355
Kind Code:
A1
Abstract:
A controller of an electric car for controlling a motor which drives a wheel of the electric car by a vector control inverter for controlling the primary current of the motor which is divided into an exciting current component and a torque current component which are respectively controlled by the command values of the components, characterized in that the controller comprises a means which detects the wheel speed (including the rotor frequency of the motor which is proportional to the wheel speed), a means which detects slip and skid of the wheel in accordance with the differential coefficient (change rate with time) of the detected wheel speed, a means which detects the readhesion of the wheel in accordance with the differential coefficient and 2nd order differential coefficient of the detected wheel speed and a means which adjusts the torque current component command value in accordance with the detection results of both the detecting means. The readhesion point of the wheel can be found when the wheel slips or skids, and the torque current component of the motor can be restored in a short time accordingly by utilizing the high speed response of the vector control. Therefore, even in a state such as a rainy weather in which the adhesion factor is small, the torque can be efficiently utilized to a physical adhesion limit, so that the acceleration/deceleration of the electric car can be increased as high as possible.
Inventors:
KANEKO TAKASHI (JP)
ANDO TAKESHI (JP)
HORIE AKIRA (JP)
ITOU KEN (JP)
ANDO TAKESHI (JP)
HORIE AKIRA (JP)
ITOU KEN (JP)
Application Number:
PCT/JP1997/003386
Publication Date:
April 01, 1999
Filing Date:
September 24, 1997
Export Citation:
Assignee:
HITACHI LTD (JP)
KANEKO TAKASHI (JP)
ANDO TAKESHI (JP)
HORIE AKIRA (JP)
ITO KEN (JP)
KANEKO TAKASHI (JP)
ANDO TAKESHI (JP)
HORIE AKIRA (JP)
ITO KEN (JP)
International Classes:
B60L3/10; B60L15/02; (IPC1-7): B60L9/16
Foreign References:
| JPH01243803A | 1989-09-28 | |||
| JPH0469003A | 1992-03-04 | |||
| JPH04364304A | 1992-12-16 | |||
| JPH06245315A | 1994-09-02 | |||
| JPH06153326A | 1994-05-31 |
Attorney, Agent or Firm:
Ogawa, Katsuo (5-1, Marunouchi 1-chom, Chiyoda-ku Tokyo 100, JP)
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