Abstract: A brake system for motor vehicles, which brake system can be actuated both by the vehicle driver and also independently of the vehicle driver in a “brake by wire” operating mode, is preferentially operated in the “brake by wire” operating mode, and can be operated in at least one fall-back operating mode in which only operation by the vehicle driver is possible. The brake system has inter alia an electrohydraulic pressure generating device (5) which outputs a brake system pressure, and a pressure modulation unit which has one inlet valve (6a-6d) and one outlet valve (7a-7d) per wheel brake (8, 9, 10, 11) for setting wheel-specific brake pressures derived from the brake system pressure, wherein the inlet and outlet valves (6a-6d, 7a-7d) output or transmit the brake system pressure when in the non-actuated state.

Abstract: A motor vehicle brake system actuated in brake-by-wire and fallback operating modes, having a brake master cylinder, brake circuits, a pressure medium storage vessel, a brake pedal, a separating valve for separating the brake circuit into a first section connected to the separating valve the master cylinder, and a second section connected to the separating valve and the wheel brakes. A first pressure provision device has a piston actuated by an actuator, a simulation device connected by a simulator release valve to the master cylinder for a pleasant brake pedal feel in the brake-by-wire operating mode. A first electronic control and regulating unit actuates the first pressure provision device, the separating valves and the simulator release valve. A second pressure provision device has a suction connector and a pressure connector per brake circuit being connected to the inlet of the separating valve.

Abstract: An electrohydraulic brake system method for motor vehicles having a wheel-specific brake control function (ABS, ESC, TCS) and hydraulically actuable wheel brakes (43, 44, 45, 46), communicating with an electrically controllable pressure supply device. The pressure supply device (40) having a cylinder-based piston arrangement with a pressure space driven by an electromechanical actuator (2, 4). To set a brake system pressure (Psys) wherein a wheel-specific wheel setpoint pressure (Pi) is predefined for each wheel brake, and a pressure regulating process (301) is carried out, wherein at certain times a control process (303) of the pressure medium volume which is output by the pressure supply device is carried out instead of the pressure regulating process (301) of the brake system pressure, switching over (302) from the pressure regulating process to the control of the pressure medium volume is carried out as a function of the wheel setpoint pressures (Pi).

Abstract: A method for operating a motor vehicle brake system, the brake system including an electrically controllable pressure-providing device, including a cylinder/piston assembly having a hydraulic pressure chamber and a piston that can be moved by an electromechanical actuator, a number of hydraulic wheel brakes associated with two axles of the vehicle can be supplied with braking pressure via the hydraulic pressure chamber, and a sensor for detecting the driver braking request. An electric drive having at least one electrical machine, which can also be operated as a generator, is associated with at least one axle of the vehicle, and, during regeneration braking, in which a generator deceleration is built up by the electric drive, the cylinder-piston assembly is controlled such that the pressure in the hydraulic pressure chamber is adjusted in accordance with the difference between the requested braking deceleration and the generator deceleration built up by the electric drive.

Abstract: A method for determining the absolute position of a linear actuator is described. In the process, the rotational angle position of the rotor of the corresponding electric motor of the linear actuator is determined by a first sensor. In addition, the rotary angle position of a transmitter wheel of a second sensor coupled to the rotor is determined by means of a special transmission ratio. The absolute position of the linear actuator is derived from the differential value of the determined rotary angle positions. The method can be implemented in a simple and inexpensive manner.

Abstract: A brake system includes a hydraulic actuating unit, which can be actuated by way of a brake pedal, a travel simulator interacting with the hydraulic actuating unit, a pressure medium reservoir under atmospheric pressure assigned to the hydraulic actuating unit, a first electrically controllable pressure supply device, a second electrically controllable pressure supply device, an electronic control unit and an electronically controllable pressure modulation device for setting wheel-specific brake pressures. The brake system preferably operates in a “brake-by-wire” mode but can also operate in a fallback mode. The second electrically controllable pressure supply device can provide boost volume during braking in a fallback mode.

Abstract: A method for monitoring a brake system for motor vehicles. The system can be actuated both by a vehicle driver and independently of the vehicle driver in what is known as a brake-by-wire mode. The hydraulic actuation device can be actuated by means of a brake pedal and has a main brake cylinder to which wheel brakes are connected, at least two brake circuits, a simulation device, which comprises at least one elastic element and gives the vehicle driver a comfortable pedal feeling, an electrically controllable pressure-providing device, which is formed by a cylinder/piston assembly, the piston of which can be actuated by an electromagnetic actuator, wherein the first measurement variable (PDBE) characterizing a position of the piston is detected. The detected measurement value of the first and second measurement variable (SDBE, PDBE) are compared to a predetermined characteristic map of the first and second measurement variables in order to monitor a functional status of the brake system.

Abstract: A system and method for operating a brake system for motor vehicles, includes a master brake cylinder actuated by a brake pedal and separably connected to at least one hydraulically acutuatable wheel brake by at least one brake circuit, a hydraulically operable pedal travel simulator is connectable to the master brake cylinder, an electrically controllable pressure provision apparatus is separably connected to the brake circuit, and an electronic open-loop and closed-loop control unit. Upon brake pedal actuation, a pressure of the pressure provision apparatus is applied to the brake circuit in a first operating mode and the pressure of the master brake cylinder is applied to the brake circuit in a second operating mode. In the event of transition from the second operating mode to the first operating mode while the brake pedal is actuated, the actuation travel of the brake pedal is adjusted by electronic open-loop or closed-loop control.

Abstract: The invention relates to a method for providing haptic information to the driver of a motor vehicle, equipped with a brake-by-wire brake system, about the operating state of the brake system, in which method the brake pedal characteristic is generated by a pedal travel simulator, in the form of a functional relationship between the brake pedal opposing force and the brake pedal travel, and is modified as a function of an operating state. In order to provide the driver with the haptic information channel via which electronically controlled information can be communicated to the driver during braking, without the impression of a defect arising, the invention proposes that a basic brake pedal characteristic is generated by a passive simulator spring which assigns pedal travel, on which pedal return travel transporting the haptic information is superimposed, to a given pedal force in an unchanging, constant relationship.

Abstract: A system and method for operating a brake system for motor vehicles, includes a master brake cylinder actuated by a brake pedal and separably connected to at least one hydraulically acutuatable wheel brake by at least one brake circuit, a hydraulically operable pedal travel simulator is connectable to the master brake cylinder, an electrically controllable pressure provision apparatus is separably connected to the brake circuit, and an electronic open-loop and closed-loop control unit. Upon brake pedal actuation, a pressure of the pressure provision apparatus is applied to the brake circuit in a first operating mode and the pressure of the master brake cylinder is applied to the brake circuit in a second operating mode. In the event of transition from the second operating mode to the first operating mode while the brake pedal is actuated, the actuation travel of the brake pedal is adjusted by electronic open-loop or closed-loop control.

Abstract: A motor vehicle brake system actuated in brake-by-wire and fallback operating modes, having a brake master cylinder, brake circuits, a pressure medium storage vessel, a brake pedal, a separating valve for separating the brake circuit into a first section connected to the separating valve the master cylinder, and a second section connected to the separating valve and the wheel brakes. A first pressure provision device has a piston actuated by an actuator, a simulation device connected by a simulator release valve to the master cylinder for a pleasant brake pedal feel in the brake-by-wire operating mode. A first electronic control and regulating unit actuates the first pressure provision device, the separating valves and the simulator release valve. A second pressure provision device has a suction connector and a pressure connector per brake circuit being connected to the inlet of the separating valve.

Abstract: The invention relates to a pedal travel simulator for the hydraulic connection to a pressure chamber of a master brake cylinder of a hydraulic brake system, in particular for motor vehicles, having a housing and a simulator piston that is diplaceably mounted in the housing, wherein the simulator piston delimits a first hydraulic simulator chamber together with the housing, which simulator chamber can accommodate pressurizing media. Wherein an elastic restoring means acts on the simulator piston, wherein the pedal travel simulator includes a second hydraulic simulator chamber for accommodating pressurizing media, the simulator chamber being delimited by an elastically deformable membrane. The invention further relates to an actuating unit for a hydraulic motor vehicle brake system of the brake-by-wire type, and to a hydraulic motor vehicle brake system.

Abstract: A steering device for adjusting a wheel turning angle of a wheel of a motor vehicle, in particular of a rear wheel, includes a wheel guide member via which a wheel carrier of the wheel is connected to a vehicle body, the wheel carrier being swivellable about an axis of rotation disposed parallel to the wheel plane and the wheel guide member being articulated to the wheel carrier at a distance from the axis of rotation and being adjustable in length by an electromechanical drive unit, the electromechanical drive unit being connected, on the one hand, via a push rod to a joint at the wheel carrier end in order to form a swivel bearing to establish a connection to the wheel carrier, and, on the other hand, to a joint at the vehicle body end to form a further swivel bearing to establish a connection to the vehicle body.

Abstract: A method for monitoring a brake system for motor vehicles. The system can be actuated both by a vehicle driver and independently of the vehicle driver in what is known as a brake-by-wire mode. The hydraulic actuation device can be actuated by means of a brake pedal and has a main brake cylinder to which wheel brakes are connected, at least two brake circuits, a simulation device, which comprises at least one elastic element and gives the vehicle driver a comfortable pedal feeling, an electrically controllable pressure-providing device, which is formed by a cylinder/piston assembly, the piston of which can be actuated by an electromagnetic actuator, wherein the first measurement variable (PDBE) characterizing a position of the piston is detected. The detected measurement value of the first and second measurement variable (SDBE, PDBE) are compared to a predetermined characteristic map of the first and second measurement variables in order to monitor a functional status of the brake system.

Abstract: A brake system for motor vehicles, which brake system can be actuated both by the vehicle driver and also independently of the vehicle driver in a “brake by wire” operating mode, is preferentially operated in the “brake by wire” operating mode, and can be operated in at least one fall-back operating mode in which only operation by the vehicle driver is possible. The brake system has inter alia an electrohydraulic pressure generating device (5) which outputs a brake system pressure, and a pressure modulation unit which has one inlet valve (6a-6d) and one outlet valve (7a-7d) per wheel brake (8, 9, 10, 11) for setting wheel-specific brake pressures derived from the brake system pressure, wherein the inlet and outlet valves (6a-6d, 7a-7d) output or transmit the brake system pressure when in the non-actuated state.

Abstract: A steering device for adjusting a wheel turning angle of a wheel of a motor vehicle, in particular of a rear wheel, includes a wheel guide member via which a wheel carrier of the wheel is connected to a vehicle body, the wheel carrier being swivellable about an axis of rotation disposed parallel to the wheel plane and the wheel guide member being articulated to the wheel carrier at a distance from the axis of rotation and being adjustable in length by an electromechanical drive unit, the electromechanical drive unit being connected, on the one hand, via a push rod to a joint at the wheel carrier end in order to form a swivel bearing to establish a connection to the wheel carrier, and, on the other hand, to a joint at the vehicle body end to form a further swivel bearing to establish a connection to the vehicle body.