A hydraulic-pressure control device includes a regulator including a housing, a control piston in the housing, an input chamber at a rear of the piston, and an output chamber in front of the piston; and an input-hydraulic-pressure control device which controls hydraulic pressure in the input chamber to move the piston forward or backward to raise or reduce hydraulic pressure in the output chamber. The input-hydraulic-pressure control device includes a moving-direction control unit which, when a difference obtained by subtracting an actual hydraulic pressure in the output chamber from a target hydraulic pressure in the output chamber is less than a pressurization-side set value, controls the hydraulic pressure in the input chamber to move the piston backward; and when the difference is greater than a reduction-side set value, controls the hydraulic pressure in the input chamber to move the piston forward.

An electronically slip-controllable vehicle brake system includes a human-powered master brake cylinder, a pressure generator, an electronically actuatable valve device, a wheel brake, and an electronically actuatable actuator. The wheel brake is connected to the master cylinder and the pressure generator. The pressure generator is drivable via an external force and is configured to supply pressurized brake fluid to the wheel brake. The valve device is configured to control pressure medium connections from the master brake cylinder to the wheel brake and to a suction side of the pressure generator, and includes three pressure medium connections. The actuator is configured to switch the valve device between three different positions whereat the pressure medium connections are connected to or block from each other in different combinations.

A pressure regulator configured to regulate a working fluid by a pilot pressure, including: a spool valve mechanism having a spool; a biasing mechanism having a pilot-pressure chamber and a pilot piston, the biasing mechanism being configured to bias the spool toward the other end of the pressure regulator in its axial direction by a pressure of the working fluid in the pilot-pressure chamber; a counter biasing mechanism having a regulated-pressure chamber and a counter biasing piston, the counter biasing mechanism being configured to bias the spool toward one end of the pressure regulator in the axial direction by a pressure of the working fluid in the regulated-pressure chamber; and at least one of a first damping mechanism configured to damp a movement of the pilot piston and a second damping mechanism configured to damp a movement of the counter biasing piston.

Disclosed herein is an electrically controlled brake system. The electrically controlled brake system includes a motor and a pump, a master cylinder, a reservoir that is coupled to an upper portion of the master cylinder and in which a brake fluid is stored, an accumulator in which a brake fluid pumped from the reservoir is stored by the motor and the pump, a hydraulic path that connects the accumulator and each of wheel cylinders, an apply valve and a release valve that are provided on the hydraulic path and control a hydraulic pressure transferred from the accumulator to each of the wheel cylinders, a pedal simulator including a simulation chamber connected to the master cylinder and configured to store a brake fluid flowing from the master cylinder to provide a reaction force of a brake pedal, and a simulation valve provided at an inlet of the simulation chamber, a backup path that is connected to the hydraulic path and connects the master cylinder and each of the wheel cylinders, a cut valve that is provided on the backup path and blocks the backup path, a first pressure sensor that is provided on the backup path and detects a pressure of the pedal simulator, a second pressure sensor that is provided on the hydraulic path and detects a pressure of the hydraulic path and an electronic control unit (ECU) that determines whether a mechanical leak failure of the cut valve occurs using a correlation between the pressure of the pedal simulator detected by the first pressure sensor and the pressure of the hydraulic path detected by the second pressure sensor.

A braking apparatus for a vehicle is provided which includes a hydraulic booster to make wheels of the vehicle produce frictional braking force, a solenoid valve, and a collision avoidance controller. The solenoid valve selectively exerts the hydraulic pressure of brake fluid stored in an accumulator on a spool valve in the booster. When determining that there is a risk of a collision with an obstacle, the collision avoidance controller opens the solenoid valve to achieve emergency braking to minimize the risk of the collision. Basically, emergency braking is achieved by installing the solenoid valve to selectively exert the hydraulic pressure on the spool valve, thus allowing an emergency avoidance braking system to be constructed with a minimum of equipment and facilitating the mountability of the braking apparatus in the vehicles.

An electronic brake system may be capable of performing braking operation according to a pedal effort of a driver even when the brake system operates abnormally as well as simplifying a configuration thereof by minimizing the number of valves for controlling a flow of oil pressure and precisely controlling pressure therein.

The braking control device for a vehicle is adapted to be used for a vehicle brake device and it is an object of the present invention to prevent an operator of the vehicle from feeling of any an unpleasant feeling by reducing an ineffective operating amount by which no braking force increases in response to the increase of the brake operating amount. The braking control device includes a controlling portion for changing a servo performance to an ineffective operating amount reducing servo performance which is closer to the increase ratio of the hydraulic pressure braking force relative to the increase of the brake operating amount after the input piston has been in contact with the output piston when the brake operating amount reaches to the servo performance change operating amount which is smaller than the assisting limit operating amount.

A brake control system includes a trailer brake valve fluidly interposed between a vehicle brake assembly and a trailer brake assembly. A brake module is operably coupled with the vehicle brake assembly and configured to provide a first signal to the trailer brake valve. A control valve is configured to provide a second signal to the trailer brake valve. The trailer brake valve is operated based on the first signal when the vehicle is operated in a first mode and operated based on the second signal when the vehicle is operated in a second mode.

A braking control device includes a fluid pump driven by an electric motor via a coupling part, a differential pressure valve provided in a fluid path connecting a discharge part and an intake part of the fluid pump, the differential pressure valve increasing a wheel pressure of a wheel cylinder by increasing a braking liquid discharged from the fluid pump to an output pressure, and a controller that drives the electric motor and the differential pressure valve. When a valve opening amount of the differential pressure valve is reduced in a state in which the electric motor is driven, the controller performs an appropriateness determination as to whether or not the coupling part is normal based on a change in a state quantity related to the electric motor.

A vehicle braking device includes: a first hydraulic pressure generation unit that is connected to a first wheel cylinder via a first fluid passage, and generates a hydraulic pressure in the first wheel cylinder; a second hydraulic pressure generation unit that is connected to a second wheel cylinder via a second fluid passage, and generates a hydraulic pressure in the second wheel cylinder; a first power supply unit that supplies electric power to the first hydraulic pressure generation unit; a second power supply unit that supplies electric power to the second hydraulic pressure generation unit; and a normally open communication passage opening and closing unit that is provided in a communication passage connecting the first fluid passage and the second fluid passage, and opens and closes the communication passage.