US 12,077,139 B2
Brake control device
Fumiyuki Matsumura, Tokyo (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 16/636,975
Filed by HITACHI AUTOMOTIVE SYSTEMS, LTD., Hitachinaka (JP)
PCT Filed Jul. 3, 2018, PCT No. PCT/JP2018/025142
§ 371(c)(1), (2) Date Feb. 6, 2020,
PCT Pub. No. WO2019/031106, PCT Pub. Date Feb. 14, 2019.
Claims priority of application No. 2017-155417 (JP), filed on Aug. 10, 2017.
Prior Publication US 2021/0146894 A1, May 20, 2021
Int. Cl. B60T 8/171 (2006.01); B60T 8/172 (2006.01); B60T 8/174 (2006.01); B60T 8/58 (2006.01); B60T 17/22 (2006.01)
CPC B60T 8/171 (2013.01) [B60T 8/172 (2013.01); B60T 8/174 (2013.01); B60T 8/58 (2013.01); B60T 17/221 (2013.01); B60T 2210/12 (2013.01); B60T 2210/20 (2013.01); B60T 2250/00 (2013.01); B60T 2250/04 (2013.01); B60T 2270/10 (2013.01); B60T 2270/30 (2013.01); B60T 2270/88 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A brake control device for a vehicle with a brake device that can adjust a brake force depending on fed hydraulic pressure,
the vehicle comprising:
a hydraulic pressure sensor configured to measure hydraulic pressure fed to the brake device, the brake device comprising a friction member; and
an acceleration information sensor configured to be capable of detecting acceleration of the vehicle and measure acceleration information,
the brake control device comprising:
a hydraulic pressure processor configured to determine a hydraulic pressure fed to the brake device at a time of deceleration of the vehicle on a basis of a preset coefficient and cause the hydraulic pressure to be fed to the brake device to perform braking; and
a coefficient processor configured to learn a coefficient candidate, which is a candidate to change the preset coefficient, and change the preset coefficient to the coefficient candidate on a basis of a relationship between the hydraulic pressure and the acceleration based on the acceleration information in response to the vehicle satisfying a predetermined running condition, the coefficient candidate associated with a coefficient of friction of the friction member of the brake device; and
a memory configured to store an initial coefficient corresponding to the coefficient of friction of the friction member in a substantially unworn initial state,
wherein the predetermined running condition is a case in which the vehicle is continuously driven at a traveling speed equal to or lower than a predetermined speed range, and
wherein the coefficient processor changes the preset coefficient to the initial coefficient stored in the memory when the friction member of the brake device is replaced,
wherein the coefficient processor calculates a plurality of coefficient candidates on a basis of a relationship between the hydraulic pressure and the acceleration at a time of a plurality of number of times of braking that satisfies the predetermined running condition, and determines the coefficient candidate that should change the preset coefficient on a basis of the plurality of coefficient candidates,
wherein the coefficient processor determines whether to change the preset coefficient on a basis of the plurality of coefficient candidates, and
wherein the coefficient processor determines to change the preset coefficient when a probability that a value of the plurality of coefficient candidates falls within a predetermined range is equal to or more than a predetermined value, wherein the predetermined value is seven out of ten.