A braking system for a motor vehicle comprises a first and second electrically controllable pressure source for providing a brake pressure for actuating the wheel brakes. An electrically controllable pressure modulation device sets brake pressures that are individual to each of the wheel brakes, said device having electrically actuatable inlet valves and outlet valves for each wheel brake. The second pressure source comprises a motor-pump unit and at least one low-pressure accumulator. The low-pressure accumulator is connected to an output connection of at least one outlet valve. A first and a second energy supply unit for the braking system are independent from one another. The first energy supply unit supplies the first pressure source with energy. The second energy supply unit supplies the second pressure source with energy. The pressure modulation device is supplied with energy by the first energy supply unit and by the second energy supply unit.

The vehicle braking device includes a pilot pressure control portion which executes normal control in which the pilot pressure is controlled in response to the target value of the servo pressure and shortening control in which the change amount of the pilot pressure per unit time is greater than the change amount under the normal control in a mutually different timing, a state judging portion which judges the state of the master piston relating hysteresis of sliding resistance of the master piston based on the detection result of the servo pressure detecting portion or the liquid pressure co-relating with the servo premeasure and a control switching over portion which terminates the shortening control based on the detection result of the servo pressure detecting portion and the detection result of the state judging portion.

A vehicle brake device includes a hydraulic pressure control portion which performs a feed-back control so that an actual hydraulic pressure of the brake fluid approximates an instruction target pressure and a target pressure setting portion which sets the instruction target pressure to a value closer to the actual hydraulic pressure side than an operating target pressure, when a pressure deviation between the operating target pressure which is a target value of the hydraulic pressure of the brake fluid corresponding to a brake operation and the actual hydraulic pressure is larger than a first pressure difference and at the same time when the actual hydraulic pressure is approaching to the operating target pressure.

Even when downstream stiffness in a brake hydraulic circuit changes due to variation in a caliper forming a part of a wheel cylinder, temperature, wear degree, and deterioration of a frictional pad, and/or the like, a brake control apparatus performs calculation processing for calculating a switching reference operation amount, switching operation amount deviation calculation processing for calculating a deviation from the switching reference operation amount, operation amount offset processing for offsetting a pedal operation amount detected by an operation amount detection unit, target hydraulic pressure calculation processing for calculating the target hydraulic pressure with use of the offset operation amount and a reference hydraulic characteristic, and control of the electric motor (21) according to the target hydraulic pressure. By this configuration, the brake control apparatus limits an excessive movement amount of a primary piston by changing the reference hydraulic characteristic according to the change in the downstream stiffness.

A brake booster for a brake master cylinder including a drive motor connected via a linkage to a pressure piston for the brake master cylinder, the linkage having a rotatable spindle nut having an internal thread and a nonrotatable, axially displaceable spindle rod having an external thread, the threads interengaging to convert a rotational motion of the drive motor into a translational motion of the spindle rod in order to displace the pressure piston. The spindle nut has an external tooth set that is in engagement with an internal tooth set of a annular drive gear of the linkage. The spindle nut is axially displaceable with respect to the annular drive gear. Except for a first tooth flank of a tooth, which extends in a first axial portion in its longitudinal extent toward an oppositely located tooth flank, tooth flanks of the internal and external tooth sets extend axially.

A brake system having a wheel brake and being operable under a non-failure normal braking mode and a manual push-through mode. The system includes a master cylinder operable by a brake pedal during the manual push-through mode to provide fluid flow at an output for actuating the wheel brake. A first source of pressurized fluid provides fluid pressure for actuating the wheel brake under the normal braking mode. A second source of pressurized fluid generates brake actuating pressure for actuating the wheel brake under the manual push-through mode.

A control device and a method for operating an electromechanical brake booster of a brake system configured to execute anti-lock control actions, including the steps: determining a setpoint variable regarding a setpoint brake pressure to be produced by the electromechanical brake booster, in view of at least a differential travel; and controlling the electromechanical brake booster in view of the determined setpoint variable; at least during an anti-lock control action carried out in the brake system, it being ascertained if the differential travel lies outside of a specified normal value range, and in some instances, the additional steps being executed: determining a correction variable for the setpoint variable in view of at least a difference between the determined setpoint variable and an actual variable regarding an actual pressure present in at least part of the volume of the brake system, and controlling the electromechanical brake booster in additional view of the determined correction variable.

The method relates to a method for boosting the braking force in an electromotor operated slip-controllable vehicle brake system having electromechanical brake boosting. The vehicle brake system includes a braking-intention detection device, an electromechanically actuatable brake booster, and an electronically actuatable brake-pressure control device. In the event of a malfunction of the brake booster, the boosting of the brake pressure is alternatively assumed by the brake-pressure control device. In the event of a malfunction of the brake boosting, it is checked whether a generation and a transmission of a trigger signal representing the actuation of the braking-intention detection device from the first electronic control device of the brake booster to a second electronic control device of the brake-pressure control device is possible, and if this is so, the trigger signal is transmitted via an existing communications link between the control devices.

A braking force control device is provided which has a control unit that controls an upstream braking actuator that generates a common upstream pressure for four wheels and a downstream braking actuator that individually controls the braking pressure supplied to each wheel using the upstream pressure. The control unit controls the upstream pressure so that the braking pressure of the front wheels is permitted to be higher than a lock pressure of the rear wheels but does not become higher than a lock pressure of the front wheels, and suppresses an increase of the braking pressure of the rear wheels so that the braking pressure does not become higher than the lock pressure of the rear wheels, in a situation where the upstream pressure can be supplied to each braking force generating device but the braking pressure of any one of the wheels cannot be decreased.

Disclosed herein is an electronic brake system using an integrated sensor, which includes a hydraulic block configured to distribute and supply a fluid to a wheel brake, and having a through-hole penetrated at both sides thereof, a sensor module installed at one side of the hydraulic block having the through-hole, for sensing a linear displacement of a brake pedal and a position of a motor, and an electronic control unit installed to a side of the hydraulic block opposite to the sensor module, in order to determine a movement distance of the pedal, based on the linear displacement of the pedal sensed by the sensor module, and control rotation of the motor depending on the linear displacement of the pedal.