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 in a “brake by wire” mode, can be activated both by the vehicle driver and also independently of the vehicle driver, which is operated preferentially in the “brake by wire” operating mode and can be operated in a fall-back mode. A pedal force actuating element connected to a brake pedal is guided in a retaining piston forming a retaining chamber. Dividing piston devices interact with the retaining piston and connected to vehicle wheel brakes. The first dividing piston and the second dividing piston surface are formed on a first dividing piston portion and the first dividing piston surface, together with a third dividing piston surface formed on a second dividing piston portion form an intermediate chamber connected to electrohydraulic pressure generating device. A pressure modulation valve enables both a build-up of pressure in and also a discharge of pressure from the intermediate chamber.

Abstract: Disclosed herein is a method of determining the brake pedal actuation force exerted by a vehicle driver on an actuating pedal in an electrohydraulic brake system which includes a brake master cylinder and an electromechanically driven booster stage connected upstream of the brake master cylinder. The brake pedal actuation force sought is determined according to the formula FPed,Bet=FBet,Hz?FVerst by evaluating output signals of a pressure sensor which detects the pressure induced in the brake master cylinder, and of an auxiliary force determining device which detects the boost force made available by the booster stage.

Abstract: A brake system with a master cylinder, a first piston which is coupled to a brake pedal via a push rod transmitting actuating forces, a second piston which can be actuated by the first piston and which can be brought into force-transmitting connection to a third piston, via which the master cylinder is actuated, at least one elastic element which forms a pedal travel simulator which, in the “brake-by-wire” operating mode, gives the vehicle driver a pleasant pedal sensation, an interspace capable of being acted upon with hydraulic pressure, between the second and the third piston, the action of pressure upon the interspace loading the second and the third piston in opposite directions, a pressure supply device which has a high-pressure source and which allows both a filling of the interspace with pressure medium and emptying thereof, and a valve device for varying pressure fed in the interspace.

Abstract: A slide valve for regulating the hydraulic pressure at a working connection to values between a low pressure and a high pressure, for which purpose a valve slide is accommodated in a hole of a housing such that it can move linearly, which housing has a low pressure connection, a high pressure connection and the working connection, for which purpose the working connection is connected to the low pressure connection in the first position of the valve slide, while the working connection is separated from the two further connections in a second position of the valve slide, and having a third position of the valve slide, in which the working connection is connected to the high pressure connection (P). A plurality of radial holes are arranged in the valve slide, through which radial holes flow can pass and which radial holes interact with a plurality of circumferential control edges in the housing which seal the valve slide in the hole in a leakfree manner by means of suitable sealing rings.

Abstract: A sliding valve having a valve slider that can be axially displaced relative to the valve sleeve in order to determine the size of variable passage cross-sections and for establishing a pressurization connection between a high-pressure connection and a working connection and a pressure-reducing connection between the working connection and a low-pressure connection, in that control edges running in the circumferential direction are configured on the outer circumference of the valve slider, which interact with the control edges of the valve sleeve. The control edges of the valve sleeve are configured as edges extending in the circumferential direction relative to the symmetry axis, which are a component of a lateral face of the valve sleeve.

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 linear unit for applying an axially acting force, composed of a rotational/translational gear (2) which has a threaded spindle (18) and a threaded nut (19) which are arranged in a gear housing (22), and of an electric motor (1) with a rotor (12) and with a stator (11) which are arranged in an electric motor housing (10). In order to simplify the set-up of the linear unit, while at the same time reducing the packaging space required, according to the invention the threaded spindle (18) is mounted rotatably and axially fixedly inside the gear housing (22) and is connected to the rotor (12) outside the gear housing (22).

Abstract: A brake system for motor vehicle having a system for reducing brake pedal travel. The system having an electronic control and regulating unit (11), a brake pedal (9) having an amplifier chamber (13), a travel detecting device (14), a main brake cylinder (3) with at least one pressure chamber, a brake circuit (I, II), an electrically controllable pressure supply device (18, 19), a pressure regulating valve (20), and a cylinder-piston arrangement (8) for reducing pedal travel. The cylinder-piston arrangement (8) is disposed separately from the brake force amplifier (18; 20; 13; 6) and from the main brake cylinder (3).

Abstract: A hydraulic vehicle brake system and method of operating same. The system includes an electrohydraulic wheel brake pressure modulation unit, a master brake cylinder (11) which has a pressure medium storage reservoir (12) for hydraulic brake fluid and which can be actuated by means of a brake pedal (9) and to which first and second brake circuits (I, II) are connected. Wheel brakes (3, 4, 5, 6) are connected to the first and second brake circuits (I, II). Each of the first and second brake circuits have a pair of inlets valves (14a-d, 114a-b) and a pair of outlet valves (15a-d, 115a-b) connected to the wheel brakes (3, 4, 5, 6). The outlets of the outlet valves (15a-d, 115a-b) of each of the first and second brake circuits (I, II) are connected to one another by means of jointly used hydraulic line sections (16a, 16b).

Abstract: Disclosed is an electrohydraulic brake system for use in vehicles which can be braked by means of generator operation of an electric drive motor. The brake system comprises, inter alia, a brake booster and an electronic control unit which is provided for distributing the braking effect between a generative component or recuperation braking component and a friction braking component. In order to optimize the take-up of pressure medium, in particular during recuperation braking, the brake booster (6, 11, 15) is configured to be electrically actuated by the electronic control unit (10). The boosting force generated by the brake booster (6, 11, 15) is exerted as a function of variables relevant to the brake system.

Abstract: Disclosed is a method for operating a brake system for motor vehicles that can be actuated in a “brake-by-wire” operating mode both by the vehicle driver and independently of the vehicle driver, and that is operated preferably in the “brake-by-wire” operating mode, and that can be operated in a first fallback operating mode wherein a brake force amplifier is available, and in a second operating mode without brake force amplification, in which only operation by the vehicle driver is possible. According to the invention, the “brake-by-wire” operating mode, provided as the normal operating mode, is divided into energy-saving and high-power operating modes, between which a switch is made depending on the braking situation, and using different components of the hydraulic circuit.

Abstract: A pulsation damping capsule including at least one hermetically joint-sealed metal membrane housing made of at least two preferably concave hemispheres, the housing being provided for separating an inner space from a surrounding pressure medium, wherein the hemispheres are connected together along a peripheral seam firmly bonded such that the pulsation damping capsule can be compressed and expanded as an energy accumulator with spring elasticity due to the effect of the pressure medium. A pulsation damping device is provided which is both dimensioned to withstand stresses and is simple to produce, the pulsation damping effect of which can be tailored especially easily to the existing conditions. Further disclosed is a pulsation damping module for housing a plurality of pulsation damping capsules.

Abstract: Disclosed herein is a method of determining the brake pedal actuation force exerted by a vehicle driver on an actuating pedal in an electrohydraulic brake system which includes a brake master cylinder and an electromechanically driven booster stage connected upstream of the brake master cylinder. The brake pedal actuation force sought is determined according to the formula FPed,Bet=FBet,Hz?FVerst by evaluating output signals of a pressure sensor which detects the pressure induced in the brake master cylinder, and of an auxiliary force determining device which detects the boost force made available by the booster stage.

Abstract: A brake system for motor vehicles having a brake master cylinder that can be operated by a brake pedal, a fluid reservoir assigned to the brake master cylinder, a hydraulic booster stage which is operatively connected to the inlet side of the brake master cylinder, with a booster piston which is subjected to a hydraulic boost pressure supplied by a pressure source and which in all operating modes allows a direct mechanical action by the brake pedal on a hydraulic piston of the brake master cylinder, and having an electrically controllable pressure regulating valve arrangement for metering the boost pressure. In order to provide a brake system of simple design, which is cost-effective to produce and which functions reliably, the pressure regulating valve arrangement can be hydraulically controllable.

Abstract: A sliding valve having a valve slider that can be axially displaced relative to the valve sleeve in order to determine the size of variable passage cross-sections and for establishing a pressurization connection between a high-pressure connection and a working connection and a pressure-reducing connection between the working connection and a low-pressure connection, in that control edges running in the circumferential direction are configured on the outer circumference of the valve slider, which interact with the control edges of the valve sleeve. The control edges of the valve sleeve are configured as edges extending in the circumferential direction relative to the symmetry axis, which are a component of a lateral face of the valve sleeve.

Abstract: A brake system with a master cylinder, a first piston which is coupled to a brake pedal via a push rod transmitting actuating forces, a second piston which can be actuated by the first piston and which can be brought into force-transmitting connection to a third piston, via which the master cylinder is actuated, at least one elastic element which forms a pedal travel simulator which, in the “brake-by-wire” operating mode, gives the vehicle driver a pleasant pedal sensation, an interspace capable of being acted upon with hydraulic pressure, between the second and the third piston, the action of pressure upon the interspace loading the second and the third piston in opposite directions, a pressure supply device which has a high-pressure source and which allows both a filling of the interspace with pressure medium and emptying thereof, and a valve device for varying pressure fed in the interspace.

Abstract: A slide valve for regulating the hydraulic pressure at a working connection to values between a low pressure and a high pressure, for which purpose a valve slide is accommodated in a hole of a housing such that it can move linearly, which housing has a low pressure connection, a high pressure connection and the working connection, for which purpose the working connection is connected to the low pressure connection in the first position of the valve slide, while the working connection is separated from the two further connections in a second position of the valve slide, and having a third position of the valve slide, in which the working connection is connected to the high pressure connection (P). A plurality of radial holes are arranged in the valve slide, through which radial holes flow can pass and which radial holes interact with a plurality of circumferential control edges in the housing which seal the valve slide in the hole in a leakfree manner by means of suitable sealing rings.

Abstract: A brake-by-wire brake system has a pressure supply device (33) keeping on hand highly pressurized pressure fluid for filling the space (21) and a pressure control valve (34) which is connected hydraulically to the pressure supply device (33) and a pressure fluid supply tank (42) in order to control the pressure introduced into the space (21) The pressure control valve can be actuated by the brake pedal or hydraulically (52, 35), and serves the electric control of the pressure in the space (21).

Abstract: A hydraulic vehicle brake equipped with a parking brake device, in particular for motor vehicles, including a brake housing in which a hydraulic service pressure chamber is delimited by a brake piston, wherein the parking brake device acts on the brake piston and, in the applied condition, can be locked by a locking device, and an energy accumulator cooperating with the brake piston is equipped with at least one integrated spring element. In order to realize a simple and low-cost parking brake function that complies with legal requirements, according to the invention, the parking brake device is operable by a pressure that is introduced into the service pressure chamber and enables charging the energy accumulator.