US 12,227,155 B2
Brake device for vehicle
Naoki Yabusaki, Toyota (JP); and Teppei Onodera, Toyota (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Aug. 11, 2022, as Appl. No. 17/886,144.
Claims priority of application No. 2021-134258 (JP), filed on Aug. 19, 2021.
Prior Publication US 2023/0054637 A1, Feb. 23, 2023
Int. Cl. B60T 17/22 (2006.01); B60T 11/16 (2006.01); B60T 13/66 (2006.01); B60T 13/74 (2006.01)
CPC B60T 17/221 (2013.01) [B60T 11/16 (2013.01); B60T 13/662 (2013.01); B60T 17/225 (2013.01); B60T 13/741 (2013.01); B60T 2270/402 (2013.01); B60T 2270/406 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A brake device for a vehicle comprising a fluid supply portion that supplies a fluid to a wheel cylinder utilizing the fluid in a reservoir, the brake device being configured such that a piston presses brake pads against a disc rotor in accordance with a hydraulic pressure in the wheel cylinder, so as to apply a braking force to a wheel, the brake device comprising:
a fluid level sensor configured to measure a value of a fluid level in the reservoir; and
a controller including one or more processors and configured to:
estimate a wear amount of the brake pads based on a result of measurement by the fluid level sensor;
estimate a heat generation amount of the brake pads based on the result of measurement by the fluid level sensor; and
determine whether a leakage of the fluid is occurring based on i) an amount of change in the fluid level that is based on the result of measurement by the fluid level sensor, ii) the wear amount, and iii) the heat generation amount.