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 motor and pump assembly for providing pressure to a brake actuating device of a motor vehicle brake system is described herein. The assembly comprises an electric motor and a double diaphragm pump. The pump includes a pump housing, two opposed working diaphragms, and crank drives each being coupled between the electric motor and a respective diaphragm for moving the diaphragm. A working chamber is defined between the pump housing and a working chamber cover. Each working chamber including an inlet channel, an inlet valve associated with the inlet channel, an outlet channel, and an outlet valve associated with the outlet channel, wherein the outlet channels are defined in the covers of the working chamber and in the pump housing to direct air displaced from the working chambers into an inside space of the pump housing. An air outlet unit is provided for exhausting the air from the inside space.

Abstract: Disclosed is a method for operating a hydraulic vehicle brake system, having a brake pressure generator operable by a brake actuating device and essentially consisting of a master brake cylinder and a hydraulic booster connected upstream thereof which includes a booster chamber and a booster piston arranged therein, which latter for brake force boosting purposes, can be acted upon by a hydraulic pressure of a high-pressure accumulator that is chargeable by a hydraulic pump according to a sensor system which detects actuation and/or according to a pressure sensor sensing the hydraulic pressure that prevails in the master brake cylinder. In order to provide a safe fallback mode, upon failure of the high-pressure accumulator, the wheel brakes are acted upon by hydraulic pressure of the hydraulic pump according to the sensor system which detects actuation or according to the pressure sensor.

Abstract: To allow boosting the actuating force even if the control electronics or the electric energy supply fails in a brake-by-wire system, a piston (8) which can be acted upon by two oppositely directed forces by way of an elastic element (6, 7) on the input side and by hydraulic pressure in the space (11) on the outlet side. An arrangement (14, 19, 15) renders the pressure-supplying module (9) controllable depending on the position of the piston (8) that results from the force application, in addition to the electric controllability.

Abstract: The invention relates to a brake system comprising a master cylinder (1) to which wheel brake cylinders are connectable, a first piston (2) which is coupled to a brake pedal (3) by way of a push rod (28) that transmits actuating forces, a second piston (4) used to actuate the master cylinder (1), a third piston (5) which can be actuated by the first piston (2) and can be moved into a force-transmitting connection with the second piston (4), at least one elastic element (6, 7) forming a pedal travel simulator that imparts a pleasant pedal feeling to the operator in the ‘brake-by-wire’ operating mode, a means to couple the movements of the first and the third pistons, which is activated depending on the displacement travel of the third piston (5) in a housing (20), a space (11) between the second (4) and the third pistons (5) to which hydraulic pressure is applicable, with the pressurization of the space (11) loading the second and third pistons (4, 5) in opposite directions, as well as a pressure-supplying mod

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 brake system for motor vehicles has a master cylinder (1) to which wheel brake cylinders are connectable, a first piston (2) which is coupled to a brake pedal (3) by way of a push rod (28) that transmits actuating forces, a second piston (4) used to actuate the master cylinder (1), a third piston (5) which can be actuated by the first piston (2) and can be moved into a force-transmitting connection with the second piston (4), a pedal travel simulator, a coupling element between the first and the third pistons, which is activated depending on the displacement travel of the third piston (5), with a space (11) between the second (4) and the third pistons (5) with the pressurization of the space (11) loading the second and third pistons (4, 5) in opposite directions, as well as with a pressure-supplying module (13), which enables both filling of the space (11) with pressure fluid as well as its evacuation.

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.

Abstract: The invention relates to an actuation unit for a hydraulic vehicle brake system, comprising a pneumatic brake booster and a master brake cylinder connected downstream of the pneumatic brake booster, with the pneumatic brake booster, in a booster housing, having a first movable wall and a second movable wall being in a force-transmitting connection to a piston of the master brake cylinder, with the movable walls delimiting a working chamber which can be evacuated or aerated by means of a control group that is composed of a vacuum sealing seat, an atmospheric sealing seat, and a valve member cooperating with the sealing seats.

Abstract: Disclosed is a brake system which can be operated in three modes of operation,a non-boosted mode of operation, a hydraulically boosted mode of operation, and an electronically controlled mode of operation. The brake system includes a master cylinder (1), a first piston (2) coupled to a brake pedal (3), a second piston (4) actuating the master cylinder (1), and a third piston (5) actuatable by the first piston (2), with at least one elastic element (6, 7) being provided between the first and the third piston (5), and all three pistons (2, 4, 5) are arranged in a housing (8).

Abstract: Disclosed is a brake system which can be operated in three modes of operation, a non-boosted mode of operation, a hydraulic-booster mode of operation, and an electronically controlled mode of operation. The brake system includes a master cylinder (1), a first piston (2) coupled to a brake pedal (3), a second piston (4) actuating the master cylinder (1), and a third piston (5) actuatable by the first piston (2), with at least one elastic element (6, 7) being provided between the first and the third piston (5), and all three pistons (2, 4, 5) are arranged in a housing (8).

Abstract: The present invention relates to 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 means of 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.

Abstract: The present invention relates to a method for carrying out an automatic braking action, wherein at least one quantity representative of the application of the brake pedal is determined and an automatic braking action is triggered when at least one limit value (brake pedal application limit value) of the quantity representative of the application of the brake pedal is exceeded, wherein the brake pedal application limit value is modified or the quantity representative of the brake pedal is weighted according to at least one action of the driver, in particular a detected movement of the driver's foot, prior to an application of the brake pedal of the braking action considered or prior to the considered braking action.

Abstract: The present invention relates to a method of determining forces and torques acting on a riding vehicle. The invention is characterized in that measuring signals from acceleration sensors are evaluated which are fitted, preferably in longitudinal, transverse and vertical alignment, to one or more selected points on the vehicle, and that other signals are evaluated which represent the spatial angular velocity of the vehicle and its time derivative (rolling, pitching and/or yaw velocity and rolling, pitching and/or yaw acceleration) or at least some of these variables, and that a mathematic model of the vehicle is provided in which forces and torques acting on the vehicle or at least selected components of these forces and torques are determined from the sensor signals.

Abstract: The vehicle steering system includes a steering operating device operable by the driver, in particular a hand steering wheel, each one electromechanical actuator for controlling of each steerable wheel of a wheel pair on a steerable vehicle axle at the right and left side of a vehicle body, means which, in the event of failure or a malfunction of one of the two actuators associated with a steerable vehicle axle, ensure the control of the two vehicle wheels of this vehicle axle by the respectively other, still functioning actuator, at least one set-value transducer for a steering angle being adjusted that is operable by the steering operating device, at least one actual-value transducer recording the steering angle of the vehicle wheels, a central control unit which controls the electromechanical actuators in dependence on a comparison of a signal of the actual-value transducer (actual value) with a signal of the set-value transducer (set value), and a data transmission unit which establishes a data communicat

Abstract: The present invention relates to a pedal assembly for automotive vehicles. The aim of the invention is to prevent the pedal lever (4) from hitting the leg (13) of the driver when a crash occurs, due to displacement of the actuating rod (11) of the brake booster (9). This object is achieved by preventing the pedal lever (4) from rotating in opposition to the direction of actuation. Several measures are proposed to this end. One of said measures consists in exclusively allowing forces to the transmitted in one direction of actuation, which may be effected with the aid of a tie rod (14) that is unable to transmit any pressure forces. Another suggestion aims at mounting the pedal lever on a separately arranged transverse bar (21) rather than on the splashboard (5) as before.

Abstract: The present invention discloses a pressure fluid accumulator with a housing having its interior subdivided into two chambers by a media-separating element, the first chamber being filled with a gas and the second chamber being filled with a liquid, and wherein in a hydraulic port a bottom valve is provided whose closure member is operable by the media-separating element and which permits filling the second chamber with liquid and prevents complete evacuation of the second chamber. In order to prevent a damage of the bottom valve and an inadvertent escape of fluid and, thus, ensure a considerable increase in the reliability in operation, according to the present invention, the closure member can be moved by the media-separating element to adopt a position in which it fulfils the function of a hydraulic piston.

Abstract: The present invention relates to a maneuvering assistance system for automotive vehicles and a method of maneuvering automotive vehicles which permit a simple and safe maneuvering of the automotive vehicle particularly during a parking procedure. The present invention is especially advantageous when the automotive vehicle needs to be maneuvered, for example, on a steep positive or negative gradient. According to the present invention, a preselected or adjustable maneuvering speed is chosen such that the driver is not surprised by unwanted reactions of the automotive vehicle. The present invention especially comprises an accelerator pedal sensor [(5)] for detecting an accelerator pedal position [(&agr;)] and a device for determining a speed [(vref)] of the vehicle.

Abstract: A brake power booster is equipped with a device for determining an input force introduced at a brake pedal. According to the present invention, the device which uses a pressure generator for measuring the input force is interposed between the end of an actuating rod, connected to the brake pedal, and a valve piston that actuates a control valve of the brake power booster. The pressure generator is exposed to the effect of a pressure which develops in a pressure chamber and is built up in an elastic substance or an elastomer.

Abstract: In a method of operating an anti-lock automotive vehicle brake system for driving stability control and/or traction slip control which includes a brake force booster operable irrespective of the driver's wish, the brake force booster, at the commencement of control, will achieve its maximum attainable boosting force irrespective of the driver's wish, and the desired wheel braking pressures are adjusted by way of the ABS hydraulic unit, and at the end of the control, the independent actuation of the brake force booster will not be deactivated until the brake force booster has been reset to its initial position by returning the pressure fluid discharged from the wheel brakes into the low-pressure accumulators.