Title:
Electric parking brake device
Document Type and Number:
Japanese Patent JP6276133
Kind Code:
B2
Abstract:
An electric parking brake device holds a parking brake in a braking state by a rotation-linear motion conversion mechanism that converts rotation of an electric motor into a motion in a linear direction, and releases the parking brake by the rotation-linear motion conversion mechanism. In a case of releasing the parking brake, the electric motor is controlled by combining PWM control and ON/OFF control with each other. When the electric motor is driven according to the PWM control, and a predetermined time has elapsed after start of the PWM control, then the electric motor is changed to drive according to the ON/OFF control. In the ON/OFF control, a change in which a drive current of the electric motor is decreased stepwise is detected, whereby a torque drop of the rotation-linear motion conversion mechanism is detected.
Inventors:
Osamu Takei
Application Number:
JP2014156915A
Publication Date:
February 07, 2018
Filing Date:
July 31, 2014
Export Citation:
Assignee:
Hitachi Automotive Systems, Ltd.
International Classes:
B60T8/17; B60T13/74; F16D65/18; H02P29/00
Domestic Patent References:
| JP2012101749A | ||||
| JP2012229798A | ||||
| JP2008057643A | ||||
| JP8182366A |
Attorney, Agent or Firm:
Moriaki Ogawa
Haruyuki Nishiyama
Mitsuji Sekiya
Haruyuki Nishiyama
Mitsuji Sekiya