US 12,409,817 B2
Brake control device and brake control method
Kyoshiro Itakura, Tokyo (JP); Takahiro Ito, Tokyo (JP); Kenichiro Matsubara, Hitachinaka (JP); Daisuke Goto, Hitachinaka (JP); and Makoto Matsuura, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 17/433,088
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Oct. 17, 2019, PCT No. PCT/JP2019/040901
§ 371(c)(1), (2) Date Aug. 23, 2021,
PCT Pub. No. WO2020/179122, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 2019-039401 (JP), filed on Mar. 5, 2019.
Prior Publication US 2022/0041144 A1, Feb. 10, 2022
Int. Cl. B60T 8/171 (2006.01); B60T 13/74 (2006.01); B60T 17/22 (2006.01); F16D 66/00 (2006.01); F16D 55/226 (2006.01); F16D 121/24 (2012.01); F16D 125/40 (2012.01)
CPC B60T 8/171 (2013.01) [B60T 13/746 (2013.01); B60T 17/221 (2013.01); F16D 66/00 (2013.01); F16D 55/226 (2013.01); F16D 2066/005 (2013.01); F16D 2066/006 (2013.01); F16D 2121/24 (2013.01); F16D 2125/40 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A brake control device that controls a braking unit including a friction member pushed on a braking target member, a piston that abuts on the friction member and moves in a linear motion direction by rotation of an electric motor, and a thrust detection unit that detects thrust of the friction member to the braking target member,
wherein the brake control device is configured to estimate rigidity of the braking unit based on:
a first inclination defined by a difference between the thrust of the friction member at a first position and at a second position of the piston, the first position and the second position being in a first piston position range, wherein the first position corresponds to a first threshold value and the second position corresponds to a second threshold value,
a second inclination different from the first inclination defined by a difference between the thrust of the friction member at a third position and at a fourth position of the piston, the third position and the fourth position being in a second piston position range, wherein the third position corresponds to a third threshold value and the fourth position corresponds to a fourth threshold value, and
a difference between the positions of the piston in the first piston position range and the second piston position range,
wherein the brake control device is configured to estimate the rigidity of the braking unit after determining that:
the thrust of the friction member to the braking target member is greater than the first threshold value, the first position of the piston determined at a time that the thrust of the friction member to the braking target member is greater than the first threshold value is determined;
the thrust of the friction member to the braking target member is greater than the second threshold value, the second position of the piston determined at a time that the thrust of the friction member to the braking target member is greater than the second threshold value is determined,
the thrust of the friction member to the braking target member is greater than the third threshold value, the third position of the piston determined at a time that the thrust of the friction member to the braking target member is greater than the third threshold value is determined; and
the thrust of the friction member to the braking target member is greater than the fourth threshold value, the fourth position of the piston determined at a time that the thrust of the friction member to the braking target member is greater than the fourth threshold value is determined, and
wherein the brake control device is configured to output the estimated rigidity of the braking unit for control of the braking unit.