The braking device for a vehicle includes a judging portion which judges whether the input piston and the output piston are in contact with or separated from each other and a control portion which outputs the control signal to the pilot pressure generating device so that the hydraulic pressure detected by the hydraulic pressure detecting device becomes a target value corresponding to a vehicle state, when judged that the input piston is not in contact with the output piston and outputs another control signal to the pilot pressure generating device, by which the pilot pressure becomes higher than the pilot pressure generated under a same vehicle state to a vehicle state in a case that the control signal is outputted when the judging portion judges that the input piston is not in contact with the output piston, when judged that the input piston is in contact with the output piston.

A method for operating a brake system for motor vehicles comprises in a normal control mode of the system, a displacement of a piston for a pressure supply device is terminated, and inlet valves of the wheel brakes are closed in the event of a specified brake condition. The normal control mode is switched to a special control mode in the event of a specified condition for the pressure supply device. In the event of the specified brake condition in the special control mode, a displacement of the piston of the pressure supply device is terminated by outputting an actuation signal to the pressure supply device, and for at least one selected wheel brake, the corresponding inlet valve is kept open and the corresponding outlet valve is opened at least temporarily while the inlet valves of the remaining wheel brakes are closed.

A sensor device, active brake booster, and method for a braking system, including an active brake booster for carrying out/boosting an autonomous or partially autonomous brake pressure buildup, including an electronic device, which, at least during the autonomous or partially autonomous brake pressure buildup by the active brake booster, is configured, based on at least one deformation variable, provided externally or established by the sensor device, as to a deformation of the active brake booster, and/or a tensile force which effectuates the deformation and is exerted on a brake pedal, to output at least one activation signal to a warning display device and/or to a warning sound output device and/or at least one control signal to the active brake booster, to control the latter at least for a predefined first time interval into a safety mode or to interrupt the latter at least for a predefined second time interval.

A hydraulic brake system for a vehicle, including: a wheel brake device configured to generate a braking force based on a pressure of a working fluid; a first brake system including a high-pressure source device including an accumulator and a first pump device that is driven intermittently such that a pressure of the working fluid in the accumulator is not lower than a set lower limit pressure and not higher than a set upper limit pressure; a second brake system including a second pump device; and a main power source that supplies electricity to the first and second brake systems, wherein the hydraulic brake system includes an auxiliary power source that supplies electricity to the first brake system when a failure occurs in the main power source, and wherein the first pump device is continuously driven when the failure occurs irrespective of the pressure in the accumulator.

A vehicle brake system, including: a first-braking-force control mechanism configured to control a first braking force, a second-braking-force control mechanism configured to control a second braking force, an abnormal-state detecting device configured to detect whether the first-braking-force control mechanism is in an abnormal state, a pseudo-abnormal-state detecting device configured to detect whether the first-braking-force control mechanism is in a pseudo abnormal state in which the first-braking-force control mechanism is suspected to be in the abnormal state, and a controller including a pseudo abnormal state controller configured to control the second-braking-force control mechanism in an operating state of the first-braking-force control mechanism so as to control the second braking force when the pseudo-abnormal-state detecting device detects that the first-braking-force control mechanism is in the pseudo abnormal state.

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.

Provided are an apparatus for braking using an electric booster and a control method thereof. The apparatus for braking using an electric booster includes an electric booster connected to a master cylinder and configured to discharge braking hydraulic pressure by pressing a piston of the master cylinder with electric power of a motor together with a driver's pedal force, an electric hydraulic braking unit connected to the master cylinder through hydraulic lines, and configured to store braking hydraulic pressure in an accumulator and to perform ESC braking by driving a pumping motor, and a control unit configured to control the electric booster and the electric hydraulic braking unit, to compare required braking hydraulic pressure with preset reference hydraulic pressure when the ESC braking is required, and to perform ESC braking by the electric hydraulic braking unit or braking by the electric booster according to a result of the comparison.

A hydraulic motor vehicle brake system comprises a vehicle dynamic control system which comprises a first brake circuit which acts on at least one first wheel brake, and a second brake circuit which acts on at least one second wheel brake, the first brake circuit comprising a first hydraulic pressure generator and the second brake circuit comprising a second hydraulic pressure generator, which can be actuated electrically for control interventions. Furthermore, the hydraulic motor vehicle brake system comprises an electrically actuable third hydraulic pressure generator, and a controller which is configured to detect failure of at least one of the two brake circuits and a requirement of a control intervention on the at least one brake circuit, to actuate at least the third hydraulic pressure generator for assisting the control intervention.

A braking system includes an actuating unit for specifying a braking intention, and multiple braking devices. A first braking device includes a wheel brake, onto which a drivable pressure generator is able to apply a pressure medium, which is under braking pressure, the pressure generator being contactable with a pressure medium reservoir via a supply line. A second braking device, for converting kinetic energy of the motor vehicle into electric energy, is equipped with a drivable electric machine. The two braking devices jointly contribute to the generation of the braking power of the braking system, the respective proportion of a braking device in the braking power being variable. A connection is established, through which pressure medium is able to flow, from the wheel brake to the pressure medium reservoir using an electronic control unit, when the second braking device is able to itself generate the braking power.

A control apparatus for an electromechanical-brake-booster of a vehicle, having: an electronic-device to control an electric-motor of the electromechanical-brake-booster so that an output piston, connected indirectly to the electric-motor, of the electromechanical-brake-booster is displaceable out of its initial-position by the controlled electric-motor, such that only after a displacement of the output-piston out of its initial-position by at least a predefined limit displacement travel does a frictional engagement exist between the output-piston and an input-piston that is indirectly connected to the brake-pedal and is displaced by the actuation of the brake-pedal, and such that a speed of the output-piston displaced out of its initial-position by less than the limit displacement travel is at first increased from a reference-speed to a maximum-speed and is then reduced from the maximum-speed to the reference-speed. The invention furthermore relates to a method for operating an electromechanical-brake-booster of a vehicle.