| 摘要 |
A hydraulic-pressure control device includes: a regulator (182) including a housing (200), a control piston (204) in the housing (200); an input chamber (212) at a rear of the control piston (204) and an output chamber (214) in front of the control piston (204); and an input-hydraulic-pressure control device (56,184) which controls hydraulic pressure in the input chamber (212) to move the control piston (204) forward or backward to raise or reduce hydraulic pressure in the output chamber (214). According to the first invention, the hydraulic-pressure control device further includes: a moving-direction control unit which, when a difference obtained by subtracting an actual hydraulic pressure in the output chamber (214) from a target hydraulic pressure in the output chamber (214) is less than a pressurization-side set value, controls the hydraulic pressure in the input chamber (212) to move the control piston (204) backward and, when the difference is greater than a reduction-side set value, controls the hydraulic pressure in the input chamber (212) to move the control piston (204) forward. According to the second invention, the hydraulic-pressure control device further includes: a cylinder device (66) comprising a housing (100), a pressurizing piston (102, 104) fluid-tightly and slidably fitted in the housing, a rear chamber (136) provided at a rear of the pressurizing piston and coupled to the output chamber (214), a front pressure chamber (110, 112) provided in front of the pressurizing piston (102,104) and a brake cylinder (42, 52), coupled to the front pressure chamber, for a hydraulic brake (40, 50) capable of restraining rotation of a wheel (4, 46) of a vehicle, wherein the input-hydraulic-pressure control device (56,184) comprises a sliding-resistance-related pressure control unit configured to control the hydraulic pressure in the input chamber (212) with consideration of a sliding resistance caused between the control piston (204) and the housing (200) of the regulator (182). |
