Abstract: A diagnostic method, in particular to determine the leak tightness of at least one seal and/or one valve, for at least one component of a vehicle, wherein a piston cylinder unit, whose piston is driven by an electromotive drive, forms a pressure supply unit, wherein a control unit identifies the piston position and/or piston movement of the piston by means of at least one sensor and the pressure generated by the pressure supply unit or the motor current flowing through the drive by means of at least one sensor. During the diagnostic method, the control unit may be used to measure quantities relating to piston movement/position, pressure, and/or pressure variation.

Abstract: An operating device for a vehicle brake system may include a control device and a piston-cylinder unit, at least one chamber of which may be connected to at least one wheel brake via at least one hydraulic line and a valve device that has at least normally open inlet valves or switching valves. The device may further include a pressure source that may be controlled to supply pressure medium to the at least one hydraulic line or to the at least one wheel brake. The control device may control pressure build-up via volume control and/or time control, using inlet valves. The interior or armature chamber of an inlet valve may be connected to a corresponding brake circuit via a hydraulic line, and a valve seat outlet may be connected to a corresponding wheel brake via a hydraulic line.

Abstract: A diagnostic method may determine the leak-tightness of at least one seal and/or one valve function in a braking system with at least two brake circuits, following completion of a braking action. The diagnostic method may be carried out at a pressure still present after the braking action in one or both braking circuits and/or in hydraulic line or a working chamber of a piston-cylinder system or at a lower pressure, or it may be carried out at a pressure of at most 30 bar.

Abstract: The invention relates to an actuating system for a vehicle brake, with an actuating arrangement, in particular a brake pedal, at least one (first) piston-cylinder unit, which is connected via a hydraulic line to the vehicle brake (braking circuit) in order to supply the braking circuit with pressure medium and apply pressure to the vehicle brake, and with a drive for the piston-cylinder unit. According to the invention, pressure medium can be fed to the braking circuit in controlled manner in both piston movement directions, in particular the advance stroke and the return stroke, by means of at least one, in particular stepped, piston (10) of the piston-cylinder unit (10, 10a, 10b).

Abstract: An actuation system, in particular for a vehicle brake, may include an actuating device, such as a brake pedal, at least one first pressure source, e.g., a piston-cylinder unit (master cylinder), which can be actuated in particular by means of the actuating device and a second pressure source, in particular a piston-cylinder unit, with an electro-mechanical drive. The pressure sources may each be connected to at least one brake circuit via a hydraulic line, in order to supply the brake circuit with pressurising medium and to pressurise the vehicle brake. There may further be a valve device for regulating the brake pressure. It is planned that during forward and return stroke at least one brake circuit can be fed controlled pressurising medium by way of the second pressure source.

Abstract: A diagnostic method may determine the leak-tightness of at least one seal and/or one valve function in a braking system with at least two brake circuits, following completion of a braking action. The diagnostic method may be carried out at a pressure still present after the braking action in one or both braking circuits and/or in hydraulic line or a working chamber of a piston-cylinder system or at a lower pressure, or it may be carried out at a pressure of at most 30 bar.

Abstract: A brake system may include a brake booster, the piston-cylinder system of which is driven mechanically or hydraulically by an electric motor, in particular by means of transmission means, at least one working chamber of the piston-cylinder system being connected to at least two wheel brakes via hydraulic lines, each wheel brake being associated with a 2/2 distribution control valve and the hydraulic connecting lines between the wheels brakes and the piston-cylinder system being selectively disconnectable or jointly closable by means of the 2/2 distribution control valves such that in the wheel brakes a pressure can be adjusted consecutively in terms of a multiplex method and/or simultaneously, the electric motor and the control valves being actuated by a regulating device, characterized in that the regulating device calculates the respective pressure in the wheel brakes by means of a pressure model and transmits the calculated pressure values to at least one ABS-ESP regulator and to a pressure regulating devi

Abstract: The present arrangement relates to a method and a device for optimizing the regulation behavior of a vehicle dynamics control in motor vehicles. An improved regulation behavior may be achieved by making available information on a tire property, such as the tire type, the kind of tire, the tire pressure, the tire temperature, the condition of the tire or the age of the tire, and by transmitting the tire information to a device of a vehicle dynamics control, where it is taken into account by the latter for the regulation.

Abstract: A device and a method of controlling a movement parameter representing the movement of the vehicle, includes a first arrangement for detecting at least the transverse acceleration of the vehicle is proposed. The device also contains a second arrangement at least for determining a transverse acceleration component which depends on the transverse slope of the road surface and/or for correcting at least the transverse acceleration of the vehicle at least as a function of the transverse acceleration component. In the second arrangement a status of the vehicle whereby the transverse acceleration component which depends on the transverse slope of the road surface is determined at least as a function of the slip angle occurring on the rear axle of the vehicle.

Abstract: An apparatus and a process for closed loop control of a motion quantity representing the vehicle motion which means determine the yaw rate of the vehicle, the longitudinal speed of the vehicle, and the transverse acceleration of the vehicle. Moreover, the apparatus influences the forward moment and/or the braking moment of individual wheels of the vehicle. The apparatus further determines a transverse acceleration component dependent on the roadway transverse inclination, as well as correcting the transverse acceleration of the vehicle at least as a function of the transverse acceleration component dependent on the roadway transverse inclination. The determination of the transverse acceleration component dependent on the roadway transverse inclination and also the correction of the transverse acceleration of the vehicle as carried out in a stable state of the vehicle characterized by the yaw rate and the transverse acceleration.

Abstract: A hydraulic vehicle brake system in which normal service brake operation can be carried out by using external hydraulic energy, and in the event of a lack of external hydraulic energy, auxiliary brake operation by muscle power is possible, with a hydraulic transmission that comes from a master cylinder that can be actuated by means of the brake pedal. The external hydraulic energy is stored, for example, in an accumulator with a gas buffer, which can lead to a gas content in the hydraulic fluid for the service brake operation. The system includes a dual-circuit master cylinder associated with those wheel brakes of a vehicle axle that make a higher contribution to the vehicle deceleration and at the same time, cylinder/piston devices are installed between these wheel brakes and their associated service brake valves for the purpose of preventing hydraulic fluid from getting into these wheel brakes from the external energy source.

Abstract: A method for improving the controllability of motor vehicles during braking wherein desired slip values are determined and adjusted with the aid of a wheel slip controller. According to the method, the following are measured: the yaw rate .psi., the steering angle .delta., the wheel speeds V.sub.Ri, the inlet pressure P.sub.inlet or wheel brake pressure P.sub.i, and, if required, the engine speed and the throttle valve angle. The following variables are estimated using the measured values: the longitudinal vehicle speed V.sub.X, the longitudinal vehicle acceleration V.sub.X, the wheel slip values .lambda..sub.i, the braking forces F.sub.Bi, the tire forces F.sub.Ri, and the transverse speed V.sub.Y. Desired slip values .lambda..sub.i * are then determined from these measured and estimated variables with the aid of a simple vehicle model and supplied to the slip controller to control the vehicle wheel brake pressure.

Abstract: A vehicle hydraulic brake system having an anti-lock protection device and an automatic braking system, particularly when driving around bends. During automatic braking, an auxiliary pressure source supplies a pressure instead of the main brake cylinder and this pressure can be individually set by pressure reduction in the wheel brakes by means of the anti-lock protection device. For this purpose, cylinders with separating pistons are located between the auxiliary pressure source and the anti-lock protection device. The auxiliary pressure source supplies substantially lower auxiliary pressures than known systems by supplying pressure to the inlets of feed-back pumps by arranging valves which permit temporary pressure increases to the extent necessary for automatic braking by means of these feed-back pumps. The system requires less energy and less noise is caused in automatic braking operations.

Abstract: A required yaw rate value is determined based on driver inputs such as steering angle, master cylinder pressure, and throttle butterfly angle. The required yaw rate is compared to a measured actual yaw rate value and the actual yaw moment acceleration is influenced based on the comparison.

Abstract: In a method for detecting the reverse travel of a motor vehicle, the yaw speed and a model yaw-speed are obtained and, with the aid of these variables as well as constants, a factor .THETA.t is determined, which is compared to preselected comparison values. From these comparisons, it is determined whether forward travel or reverse travel exists.

Abstract: A hydraulic motor vehicle brake system with dual brake circuits having an anti-skid system and is also further developed to improve vehicle tracking by ways of automatic braking, especially during cornering. During automatic braking, an auxiliary pressure source delivers a pressure medium to an anti-skid system to supply the wheel brakes. For this purpose a separating piston for each brake circuit is located between the auxiliary pressure source and the anti-skid system. For the purpose of keeping costs low, the two separating pistons are accommodated in an integral cylinder with a blind bore.

Abstract: A two-channel antiblocking system for the driven wheels of an axle in which either an electronic decoupling system is connected downstream of the channels, or the channels are fed the sum (channel 1) or the difference (channel 2) of the wheel speed signals, specific controllers being used for the sum and difference, and the outputs of these controllers being on the one hand added to the actuating signal for the first channel and, on the other hand, subtracted from the actuating signal for the second channel. The aim of both measures is to compensate at least partially the coupling, caused by the differential, that is present between two drive wheels.

Abstract: A hydraulic motor vehicle brake system having anti-skid system and further developed to improve vehicle tracking, especially during cornering by means of automatic braking. With automatic braking an auxiliary pressure source delivers a pressure medium to an anti-skid system, by means of which braking pressures can be individually adjusted in the wheel brakes. For this purpose a cylinder with separating piston sections is located between the auxiliary pressure source and the anti-skid system, wherein the separating piston is installed into 2/2-way valves including lip sealing rings. The embodiment in accordance with the invention include cylinders, with valve openings in cooperation with the lip sealing rings, which results in economical 2/2-way valves.

Abstract: A lower limiting value of the yaw speed is calculated as a function of the steering angle, the vehicle speed, and the coefficient of friction between tires and road. If the yaw speed falls below the lower limiting value, the brake pressure is reduced in order to increase lateral stability.

Abstract: Using a model calculation, desired changes in the yaw rate .DELTA..phi. and the transverse acceleration .DELTA.y are determined from a small change actually made in the steering angle and are compared to measured quantities .DELTA..phi..sub.F and .DELTA.y.sub.F determined on the vehicle. The deviations of the actual values of yaw rate and transverse acceleration from the calculated values are weighted using predetermined weighting factors for the relative importance of yaw rate and transverse acceleration and supplied with factors dependent on the individual wheel; finally, the values relating to the same wheel are added. They represent desired changes in the brake slip values and a controller finally converts these into brake slip value changes.