US 11,958,459 B2
Brake system
Kyoshiro Itakura, Tokyo (JP); Toshiyuki Ajima, Tokyo (JP); Kenichiro Matsubara, Hitachinaka (JP); and Daisuke Goto, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 17/055,515
Filed by Hitachi Automotive Systems, Ltd., Hitachinaka (JP)
PCT Filed Mar. 18, 2019, PCT No. PCT/JP2019/011082
§ 371(c)(1), (2) Date Nov. 13, 2020,
PCT Pub. No. WO2019/244426, PCT Pub. Date Dec. 26, 2019.
Claims priority of application No. 2018-115135 (JP), filed on Jun. 18, 2018.
Prior Publication US 2021/0197777 A1, Jul. 1, 2021
Int. Cl. B60T 8/171 (2006.01); B60T 1/06 (2006.01); B60T 13/74 (2006.01); B60T 17/22 (2006.01)
CPC B60T 8/171 (2013.01) [B60T 1/065 (2013.01); B60T 13/746 (2013.01); B60T 17/221 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A brake system, comprising:
a brake disc that rotates with a wheel;
a brake pad that gives a braking force to the brake disc;
a piston that drives the brake pad;
a drive mechanism that gives a driving force to the piston;
a position sensor that detects a position of the piston;
a thrust sensor that detects a thrust by which the brake pad presses the brake disc; and
a brake control unit that adjusts the braking force by controlling the drive mechanism, wherein
the brake control unit includes
a contact position computation unit that computes a contact position at which the brake pad and the brake disc come in contact with each other based on output signals of the position sensor and the thrust sensor,
a position error computation unit that computes a position error of the contact position based on a delay time difference between the output signals of the position sensor and the thrust sensor, and
a contact position correction unit that corrects the contact position obtained by the contact position computation unit by using the position error,
wherein the position error computation unit outputs the position error substantially proportionally to the delay time difference between the output signals of the position sensor and the thrust sensor.