A hydraulic brake system is disclosed which may include a supply pump pressurizing a brake control system via a brake control supply line; a pressure-released brake connected to the brake control system via a brake line; a pressure relief valve with an inlet connected to the brake control supply line and an outlet connected to a relief valve discharge line; a make-up line connecting the brake line and the relief valve discharge line; and a check valve on the make-up line allowing one-way flow from the relief valve discharge line to the brake line.

A braking control device comprising: an operation amount acquisition device that obtains an operation amount for a braking operation member; a pressurizing unit that presses a friction member to a rotating member fixed to a wheel, by using an electric motor; a control that controls the output of the motor based on the operation amount; a pressing force acquisition device that obtains the actual pressing force of the friction member pressing on the rotating member; and a rotation angle acquisition device that obtains the actual rotation angle of the motor. The control: stores the correlation between the actual pressing force and the actual rotation angle; approximates a function map indicated by a second degree or higher polynomial based on the correlation; calculates a target rotation angle based on the operation amount and the function map; and controls the motor such that the actual rotation angle matches the target rotation angle.

A braking control device comprising: an operation amount acquisition device that obtains an operation amount for a braking operation member; a pressurizing unit that presses a friction member to a rotating member fixed to a wheel, by using an electric motor; a control that controls the output of the motor based on the operation amount; a pressing force acquisition device that obtains the actual pressing force of the friction member pressing on the rotating member; and a rotation angle acquisition device that obtains the actual rotation angle of the motor. The control: stores the correlation between the actual pressing force and the actual rotation angle; approximates a function map indicated by a second degree or higher polynomial based on the correlation; calculates a target rotation angle based on the operation amount and the function map; and controls the motor such that the actual rotation angle matches the target rotation angle.

A braking control device generates a force for pressing a friction member against a rotating member fixed to a wheel of the vehicle via an electric motor controlled by a controller in accordance with an operation amount of an operation member. A pressing force sensor detects a pressing force actual value, and a rotation angle sensor detects a rotation angle actual value of the motor. The controller determines whether an operating state of the pressing force sensor is appropriate. When the operating state is appropriate, the motor output is adjusted based on the pressing force actual value, a correlation between the pressing force actual value and the rotation angle actual value is stored, and a conversion calculation map is created based on the correlation. When the operating state is not appropriate, the motor output is adjusted based on the rotation angle actual value and the conversion calculation map.

A braking control device generates a force for pressing a friction member against a rotating member fixed to a wheel of the vehicle via an electric motor controlled by a controller in accordance with an operation amount of an operation member. A pressing force sensor detects a pressing force actual value, and a rotation angle sensor detects a rotation angle actual value of the motor. The controller determines whether an operating state of the pressing force sensor is appropriate. When the operating state is appropriate, the motor output is adjusted based on the pressing force actual value, a correlation between the pressing force actual value and the rotation angle actual value is stored, and a conversion calculation map is created based on the correlation. When the operating state is not appropriate, the motor output is adjusted based on the rotation angle actual value and the conversion calculation map.

A brake system for a motor vehicle, having a first hydraulic brake device configured to brake wheels on a first axle of the motor vehicle, a first control unit configured to control the braking operation of the wheels on the first axle; and a second hydraulic brake device configured to brake the wheels on a second axle of the motor vehicle, and a second control unit configured to control the braking operation of the wheels on the second axle. The first control unit is coupled with the second control unit via a communication channel. The first control unit and the second control unit are each configured to receive data that are relevant for the control of the braking operation, the first control unit furthermore being configured to transmit a data signal on the basis of the received data via the communication channel to the second control unit.

A vehicle braking device includes a storage unit storing a first relationship between the brake operation amount and a first differential pressure when the brake operation amount is within a range less than a first brake operation amount and is increasing, and a second relationship between the brake operation amount and the first differential pressure when the brake operation amount is within a range less than the first brake operation amount and is decreasing. In the first relationship a relationship in which the first differential pressure increases as the brake operation amount increases, and in the second relationship a relationship in which the first differential pressure is reduced as the brake operation amount is reduced. The first differential pressure per unit reduction in the brake operation amount in the second relationship is greater than the first differential pressure per unit increase of the brake operation amount in the first relationship.

A brake system for a motor vehicle includes a master cylinder, an actuatable switchover valve, and at least one parking brake device. The master cylinder includes at least one brake circuit which has at least one hydraulically actuatable wheel brake. The actuatable switchover valve is configured to separate and connect the brake circuit from/to the master cylinder. The parking brake device is paired with the wheel brake and configured as a hydraulically actuatable parking brake device. For this purpose, the parking brake device has a hydraulic pressure store which is configured to be operatively connected to the brake circuit. The switchover valve is configured to be closed in at least one first de-energized state in order to separate the brake circuit from the master cylinder.

An electromagnetic valve including a solenoid to generate an electromagnetic force; a cylindrical member at least partially disposed in the solenoid and made from a non-magnetic material; a movable member configured to be moved in the cylindrical member in an axial direction of the valve based on the solenoid, the movable member including a restriction portion on one end side of the movable member; a plunger including one end portion located on the one end side and an opposite end portion located on an opposite end side of the movable member, the plunger being restricted in a movement thereof in a radial direction due to the opposite end portion disposed at the restriction portion. A movable amount of the movable member in the radial direction in the cylindrical member is less than a movable amount of the plunger in the radial direction relative to the restriction portion.

A power-operated hydraulic brake system for a wheeled vehicle includes a main brake line; a brake valve configured to input a target brake pressure into the main brake line, the brake vale configured to be actuated via a brake pedal; a plurality of wheel brake lines branching off from the brake valve, each of which leads to an actuating unit of a wheel brake; and a valve assembly of an ABS control system. The valve assembly includes an inlet valve arranged between the main brake line and one of the wheel brake lines, and an outlet valve arranged between the relevant wheel brake line and an unpressurized return line. The inlet valve and the outlet valve are pressure-controlled 2/2-way switching valves with correspondingly large switching cross sections, and the inlet valve and the outlet valve are each assigned at least one pilot valve designed as a solenoid switching valve.