Title:
MOTOR CONTROL DEVICE
Document Type and Number:
Japanese Patent JP2015096005
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To reduce the number of times that a reference position is learned in a system in which a motor is driven to rotate on the basis of the output signal of an encoder.SOLUTION: An encoder counter 32 is provided that counts the output signal of an encoder 18 during a period in which an SBW-ECU 12 is in a sleep state. The SBW-ECU 12 enters a sleep state a prescribed time (a time needed for the rotation position of a motor 13 to become stable) after the rotation drive of the motor 13 is terminated. When the amount of change in the count value of the encoder counter 32 during the period of the sleep state is smaller than a prescribed value, the SBW-ECU 12 does not execute a learning process in which a reference position is learned at the time a wakeup state (start state) returns. When the amount of change in the count value of the encoder counter 32 during the period of the sleep state is equal to or greater than the prescribed value, the SBW-ECU 12 executes the learning process at the time the wakeup state returns.
Inventors:
TARUI ATSUSHI
Application Number:
JP2013235549A
Publication Date:
May 18, 2015
Filing Date:
November 14, 2013
Export Citation:
Assignee:
DENSO CORP
International Classes:
G01B7/30; G01D5/244; H02P25/08
Domestic Patent References:
| JPH10164893A | 1998-06-19 | |||
| JP2012170213A | 2012-09-06 | |||
| JP2004023890A | 2004-01-22 | |||
| JP2000018975A | 2000-01-21 | |||
| JP2012130251A | 2012-07-05 | |||
| JP2007047449A | 2007-02-22 |
Foreign References:
| US20110175563A1 | 2011-07-21 | |||
| US5652950A | 1997-07-29 |
Attorney, Agent or Firm:
Muneo Kako