Title:
DETECTION OF FAILURE DUE TO DEMAGNETIZATION OF MOTOR IN ELECTRIC VEHICLE
Document Type and Number:
Japanese Patent JP3898107
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a simple and effective method for judging the state of a permanent magnet in the motor of a vehicle.
SOLUTION: In an electric vehicle or a hybrid electric vehicle, a voltage monitor 102 is connected with a thrust motor 38 and/or a generator motor 30 and detects the permanent magnet induction voltage in a motor at a specified speed under no-load state. A controller 100 compares the permanent magnet induction voltage thus detected with a predicted reference voltage representative of the permanent magnet induction voltage being predicted at a specified speed under fully magnetized state. The comparison includes to specify the point of synchronization and to use the point of synchronization in order to judge the difference in the detected permanent magnet induction voltage caused by a failed component.
Inventors:
Abas laftari
Patrick Jay Curran
Vijay Kay Garg
Patrick Jay Curran
Vijay Kay Garg
Application Number:
JP2002270536A
Publication Date:
March 28, 2007
Filing Date:
September 17, 2002
Export Citation:
Assignee:
Ford Global Technologies, Limited Liability Company
International Classes:
B60K1/04; H02P6/12; B60K6/26; B60K6/445; B60L3/00; B60W10/08; B60W20/00; G01R31/34; H02K11/00; (IPC1-7): H02P6/12; B60K1/04; B60K6/04; B60L3/00
Domestic Patent References:
| JP7071261A | ||||
| JP9294354A | ||||
| JP2000341985A | ||||
| JP5292789A | ||||
| JP7067390A | ||||
| JP2000166021A | ||||
| JP1171575U | ||||
| JP58151890A | ||||
| JP6323806A |
Foreign References:
| WO1994026022A1 |
Attorney, Agent or Firm:
Hiroshi Maeda
Hiroshi Koyama
Hiroshi Takeuchi
Takahisa Shimada
Yuji Takeuchi
Katsumi Imae
Teshima Masaru
Atsushi Fujita
Kazunari Ninomiya
Tomoo Harada
Iseki Katsumori
Hiroshi Koyama
Hiroshi Takeuchi
Takahisa Shimada
Yuji Takeuchi
Katsumi Imae
Teshima Masaru
Atsushi Fujita
Kazunari Ninomiya
Tomoo Harada
Iseki Katsumori