A method for operating an electromechanical brake booster of a brake system of a vehicle. A virtual dynamic brake pressure value representing a driver braking request of a driver of the vehicle is determined in a control unit of the brake booster using a pedal travel of a brake pedal of the vehicle acquired at the brake booster, a clearance value of the brake system read in via a data bus of the vehicle from a brake control unit of the brake system, and a stiffness factor of the brake system read in via the data bus from the brake control unit.

A method for operating a braking system of a motor vehicle with at least one hydraulically actuable wheel brake, a brake actuation device for hydraulically actuating the wheel brake, an electric brake booster for setting a predefinable hydraulic braking boost, and at least one parking brake assembly includes monitoring the motor vehicle to detect standstill and monitoring the parking brake assembly to detect activation thereof. The method further includes reducing a braking boost set by the brake booster if standstill of the motor vehicle has been detected and an activation of the parking brake assembly has been detected.

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.

At least one embodiment of the present disclosure provides an electric booster brake apparatus including an electric booster unit, an electronic stability control (ESC) operating unit, and an electric-booster control unit. The electric booster unit has a motor, and a motor piston and a master cylinder and pressurizes the master cylinder by adjusting a displacement of the motor piston. The ESC operating unit includes a pressure sensor measuring pressure in the master cylinder and calculates a required braking pressure. The electric-booster control unit controls the position of the motor piston. The electric-booster control unit includes a feedforward control unit for converting the value of the required braking pressure into a motor piston displacement, and a feedback control unit for calculating a compensation displacement of the motor piston based on a difference between the value of the required braking pressure and the value of the pressure in the master cylinder.

An apparatus for updating a pre-stored setting value for controlling boost power of an electric booster, includes: a control unit including a processor; and a storage medium recording one or more programs configured to be executable by the processor, the one or more programs including instructions; and a measuring unit of measuring braking characteristics including pedal stroke, deceleration, and hydraulic pressure applied from the electric booster to a braking unit during braking through a braking test of a vehicle, wherein the control unit is configured for updating the pre-stored setting value so that the deceleration includes desired target deceleration based on the measured braking characteristics, and wherein the pre-stored setting value may be proportional to the pedal stroke, and may be a value for setting a magnitude of the hydraulic pressure.

A method for operating an electromechanical brake booster of a brake system of a vehicle. A virtual dynamic brake pressure value representing a driver braking request of a driver of the vehicle is determined in a control unit of the brake booster using a pedal travel of a brake pedal of the vehicle acquired at the brake booster, a clearance value of the brake system read in via a data bus of the vehicle from a brake control unit of the brake system, and a stiffness factor of the brake system read in via the data bus from the brake control unit.

[Problem] The present invention provides a vehicle brake system capable of shortening a delay time from time at which an execution request of a pre-crash brake executed by actuation of an electric booster is sent to time at which the pre-crash brake is actually actuated. [Means for Resolution] In a vehicle brake system (1) including: a hydraulic unit (20); a braking control section (90) for controlling the hydraulic unit (20); a master cylinder (14); an electric booster (10); a booster control section (100) for controlling the electric booster (10); and a pre-crash brake execution determination section (110), the pre-crash brake execution determination section (110) sends information on a specified target value (P_tgt) for decelerating a vehicle to the booster control section (100) and the braking control section (90). When a change amount (?P) of the target value (P_tgt) received from the pre-crash brake execution determination section (110) exceeds a specified threshold value (?P_thr), the booster control section (100) drives the electric booster (10) prior to a command from the braking control section (90) and executes preceding brake control for generating a specified brake hydraulic pressure to a wheel cylinder.

A recess is formed in a rear portion of a pressurizing piston, and a small-diameter rod is formed in a front portion of an input piston. A sleeve is disposed inside the recess, and the small-diameter rod is liquid-tightly and slidably fitted to the sleeve. A space between the small-diameter rod and the recess serves as a volume chamber, which is held in communication with a reservoir. The input piston and the pressurizing piston are slidably fitted to each other via the sleeve. Therefore, the generation of a frictional force between the input piston and the pressurizing piston can be made unlikely, and the pressurizing piston can be favorably prevented from advancing as the input piston advances.

The invention relates to a technique for boosting the brake force of an electrohydraulic motor vehicle brake system in a mode in which, as a result of a mechanical push-through, an actuating force onto a brake pedal acts upon a master cylinder of the brake system. According to an aspect of this technique, the method comprises the steps of: determining a value of a first variable indicating a current deceleration of the vehicle; determining, based on the first variable, a value of a second variable indicating the actuating force; determining, based on the second variable, a required brake boost; and controlling an electromechanical actuator acting upon the master brake cylinder to obtain the required brake boost.

A method for operating a braking system of a motor vehicle with at least one hydraulically actuable wheel brake, a brake actuation device for hydraulically actuating the wheel brake, an electric brake booster for setting a predefinable hydraulic braking boost, and at least one parking brake assembly includes monitoring the motor vehicle to detect standstill and monitoring the parking brake assembly to detect activation thereof. The method further includes reducing a braking boost set by the brake booster if standstill of the motor vehicle has been detected and an activation of the parking brake assembly has been detected.