Title:
FAILURE DETECTION DEVICE FOR A.C. MOTOR CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JP3218954
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a device suitable to detect failure of a current sensor for a.c. motor control and so on.
SOLUTION: A voltage command value to a motor 10 is inputted into a CPU 18, based on which the estimated values iuc, ivc, iwc of respective phase current of the motor 10 are calculated. The detected current value is inputted from a current sensor 30 fitted onto the motor 10 to calculate a deviation from the calculated estimated values iuc, ivc, iwc. When calculated deviation is larger than a prescribed threshold, processing against failure such as power converting operation is conducted. A current command value to the motor may be used in place of the estimated current values iuc, ivc, iwc.
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Inventors:
Norihiko Akao
Application Number:
JP32892895A
Publication Date:
October 15, 2001
Filing Date:
December 18, 1995
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
G01R31/02; G01R31/34; H02H7/08; H02M7/48; H02P23/07; H02P25/08; H02P27/06; H02P29/00; (IPC1-7): H02P5/00; G01R31/02; G01R31/34; H02H7/08; H02M7/48; H02P7/63
Domestic Patent References:
| JP3293994A | ||||
| JP5103418A | ||||
| JP7227086A |
Attorney, Agent or Firm:
Kenji Yoshida (2 outside)