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Title:
ELECTRIC POWER STEERING DEVICE, RESOLVER FAILURE DETECTION DEVICE, RESOLVER FAILURE DETECTING METHOD
Document Type and Number:
Japanese Patent JP2015157548
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a technique which can accurately grasp a rotation angle of an electric motor without providing a mechanical positional displacement prevention mechanism.SOLUTION: An electric power steering device includes: a three-phase brushless electric motor 110 having a resolver 120; a motor rotation angle calculation part 35 which calculates a rotation angle of the electric motor 110 based on an output value from the resolver 120; a torque sensor for detecting a steering torque of a steering wheel; a target current calculation part 20 which conducts a predetermined direct current between two specific phases of the electric motor 110; a rotation angle correction part 36 which corrects a rotation angle calculated by the motor rotation angle calculation part 35 based on a difference between the rotation angle calculated by the motor rotation angle calculation part 35 and a predetermined angle when the target current calculation part conducts said predetermined direct current; and a motor drive control part 31 which controls drive of the electric motor 110 based on the corrected rotation angle after correction by the rotation angle correction part 36.

Inventors:
ISHIGAKI HIROAKI
Application Number:
JP2014033211A
Publication Date:
September 03, 2015
Filing Date:
February 24, 2014
Export Citation:
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Assignee:
SHOWA CORP
International Classes:
B62D6/00; B62D5/04
Domestic Patent References:
JP2012201243A2012-10-22
JP2003319680A2003-11-07
JP2006296025A2006-10-26
Attorney, Agent or Firm:
古部 次郎
尾形 文雄



 
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