A method for operating a motor vehicle brake installation. An electrically controllable pressure modulation device having a pump-valve arrangement is hydraulically arranged between the primary brake system and the front axle brakes. The pump-valve arrangement includes, for each front brake, a first valve, arranged between the inlet valve of the primary brake system and the brake, and an electrically activatable pump, with a suction and pressures ports. The pressure port is connected to the brake. In the presence of a predetermined condition of the primary brake system and of an actuation of the master brake cylinder by the driver, a build-up of brake pressure at the front axle brakes is performed by the pump-valve arrangement. The pressure set by the pump-valve arrangement is higher than the brake pressure in the master brake cylinder, whereas the brake pressure of the master brake cylinder prevails at the brakes of the rear axle.

A brake control device for at least four fluidically actuatable, especially hydraulically actuatable, wheel brakes of a vehicle brake system, which device includes at least one input pressure connection, a wheel-specific output pressure connection for every wheel brake, a pressure regulating valve array for setting wheel-specific brake pressures at the output pressure connections and a pressure source the brake control device having a wheel specific input pressure connection for every wheel brake.

Provided is a brake apparatus and a brake control method capable of improving accuracy of control of a wheel cylinder hydraulic pressure. The brake apparatus includes a first brake circuit connecting a master cylinder configured to generate a brake hydraulic pressure according to a pedal operation and a plurality of wheel cylinders configured to generate a braking force on each of wheels of a vehicle by application of the brake hydraulic pressure to each other, a pump configured to increase a pressure of brake fluid in the master cylinder and transmit the brake fluid having the increased pressure to the plurality of wheel cylinders via a second brake circuit connected to the first brake circuit, a plurality of pressure increase control valves provided in the first brake circuit, and a first target upstream hydraulic pressure calculation portion configured to calculate a target hydraulic pressure in the second brake circuit in such a manner that the target hydraulic pressure exceeds a maximum value of target wheel cylinder hydraulic pressures of respective wheel cylinders corresponding to the individual wheels by an amount of a change in the hydraulic pressure in the second brake circuit when a pressure increase control valve corresponding to a wheel other than a maximum hydraulic pressure wheel, of the plurality of pressure increase control valves, is opened.

A vehicle brake system, wherein an electric brake device is configured such that a clearance exists between a friction member and a rotary body when no braking force request is made, and wherein a controller is configured to: execute, for a hydraulic brake device, from a time point of generation of the request, a braking-force-request-dependent control for generating a hydraulic braking force in accordance with a degree of the request; and execute, for the electric brake device, (a) a clearance removing control for removing the clearance, which is executed from the time point of generation of the request till a time point when the degree increases up to a threshold degree, and (b) a braking-force-request-dependent control for generating an electric braking force in accordance with the degree of the request, the control being executed after the time point when the degree becomes equal to the threshold degree.

A method for operating a brake installation of a vehicle. A first electrically controllable pressure provision device provides brake pressure for actuating hydraulically actuatable brakes. A first electronic open-loop and closed-loop control unit, and a first pressure detection device, measures brake pressure provided by a primary brake system. A secondary brake system between the primary system and a part of the wheel brakes has a second electrically controllable pressure provision device provides brake pressure for actuating at least the part of the brakes. A second electronic open-loop and closed-loop control unit, and at least one second pressure detection device, the signals of which are processed in the second electronic open-loop and closed-loop control unit. The secondary system monitors the primary system based on signals from the second pressure detection device and on a predefined brake pressure demand to build up a brake pressure corresponding to the predefined brake pressure demand.

The braking device for a vehicle includes an operation judging portion which judges whether or not the operating amount in the increasing stage is equal to or more than a predetermined threshold amount or whether or not an increasing speed of the operating amount in the increasing stage is equal to or more than a predetermined threshold speed and a control portion which selects the first operating mode as the operating mode from a start of the increasing stage until a first timing or a second timing and selects the second operating mode as the operating mode in the increasing stage after the first timing or the second timing and at the same time maintains the drive hydraulic pressure in the increasing stage after the first timing or the second timing.

A braking apparatus of a vehicle may include: a first master cylinder configured to create hydraulic pressure as a brake pedal is pressed; a second master cylinder configured to create braking pressure through a piston which is pressed by the hydraulic pressure created by the first master cylinder and a nut moved by rotation of a motor; and a control unit, configured to: calculate a required displacement position of the nut based on a pedal stroke of the brake pedal, and update the required displacement position based on a displacement position of the nut at a dead stroke end point where the pedal stroke moves away from a dead stroke section of the first master cylinder.

A method for operating a vehicle brake system including a brake booster and an electronic traction control device, which is used as a fallback level in a malfunction of the brake booster. The position of an accelerator pedal is ascertained when a malfunction of the brake booster is detected, and under the precondition that the accelerator pedal is released, a predefined initial pressure is built up in a pressure chamber of a master brake cylinder of the vehicle brake system with the aid of the traction control device so that a deceleration of the vehicle is induced. A control unit which is designed to carry out the method, and a vehicle having a vehicle brake system and a control unit, are also described.

Provided herein is an actuation unit for a braking system. The actuation unit for a braking system includes a piston directly or indirectly connected to a brake pedal, an electronic control unit, a hydraulic pressure unit, an electronic memory unit mechanically connected to the hydraulic pressure unit, and a position sensor configured to detect movement of the piston connected to the brake pedal, wherein a signal of the position sensor is corrected, and data for correcting the signal is stored in the electronic memory unit.

Am electric braking system is disclosed. The electric braking system comprising: a cylinder unit having a first piston connected to a brake pedal, a cylinder chamber with the volume varying by displacement of the first piston, and a pressing chamber with the volume varying by a pressing member, and sending an intention of braking to an electronic control unit; a reservoir storing a working fluid, a pressure applier having a second piston operating by receiving power and a pump chamber with the volume varying by displacement of the second piston, and hydraulically coupled to wheel brakes, a reservoir line connecting the cylinder chamber and the reservoir and having a reservoir valve; and a pump reservoir line connecting the pump chamber and the reservoir and having a dump valve.