US 12,134,375 B2
Electric brake device and electric brake control device
Daisuke Kojima, Hitachinaka (JP); Norikazu Matsuzaki, Hitachinaka (JP); and Masayuki Kikawa, Hitachinaka (JP)
Assigned to HITACHI ASTEMO, LTD., Ibaraki (JP)
Appl. No. 17/911,295
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Mar. 24, 2021, PCT No. PCT/JP2021/012206
§ 371(c)(1), (2) Date Sep. 13, 2022,
PCT Pub. No. WO2021/200459, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-062317 (JP), filed on Mar. 31, 2020.
Prior Publication US 2023/0126047 A1, Apr. 27, 2023
Int. Cl. B60T 13/74 (2006.01); H02P 29/00 (2016.01); H02P 29/60 (2016.01)
CPC B60T 13/74 (2013.01) [H02P 29/0022 (2013.01); H02P 29/60 (2016.02)] 9 Claims
OG exemplary drawing
 
1. An electric brake device, comprising:
a motor configured to drive an electric mechanism configured to hold a braking force by pressing a braking member against a braked member; and
a control device configured to control a drive of the motor,
wherein the control device is configured to, when releasing the hold on the braking force, stop the motor when a drive time (T3) elapses, the drive time (T3) being a sum of a time (T1) from when a current value of the motor enters a range of a constant current width (IB) until the current value of the motor becomes a no-load current value (ID) and a time (T2) required to secure a clearance between the braking member and the braked member, and
wherein the drive time (T3) is changed based on:
a current change amount from when the current value of the motor enters the range of the constant current width (IB) after a time has elapsed since the motor is energized, the current value of the motor starts to decrease after increasing and inrush current converges until the current value of the motor becomes the no-load current value (ID); and
a current value at which the current change amount of the motor converges to become equal to or less than a threshold value (Df) for judging that the current value is the no-load current value (ID).