Abstract: A brake cylinder arrangement has a brake cylinder, a pressure sensor, and a pressure reducer, wherein the pressure reducer transfers pressures from the brake cylinder to the pressure sensor differently, depending on the input pressure range. The invention furthermore relates to a braking system having a brake cylinder arrangement of this kind.

Abstract: A brake cylinder arrangement has a brake cylinder, a pressure sensor, and a pressure reducer, wherein the pressure reducer transfers pressures from the brake cylinder to the pressure sensor differently, depending on the input pressure range. The invention furthermore relates to a braking system having a brake cylinder arrangement of this kind.

Abstract: A system and method for operating a hydraulic braking system) for motor vehicles with an electrically controllable pressure provision device), a high-pressure accumulator, which can be connected to the pressure provision device via a hydraulic connection), in which an electrically controllable shutoff valve is arranged, wheel brakes, which can be supplied with pressure medium by means of the pressure provision device and/or the high-pressure accumulator. An electronic control and regulating unit is provided for actuating the electrically controllable pressure provision device and/or the electrically controllable shutoff valve so as to regulate the hydraulic pressure which is provided by the pressure provision device and the high-pressure accumulator If a pressure buildup is carried out by activation of the pressure provision device, the high-pressure accumulator is connected only temporarily by at least partial opening of the shutoff valve.

Abstract: A system and method for operating a hydraulic braking system) for motor vehicles with an electrically controllable pressure provision device), a high-pressure accumulator, which can be connected to the pressure provision device via a hydraulic connection), in which an electrically controllable shutoff valve is arranged, wheel brakes, which can be supplied with pressure medium by means of the pressure provision device and/or the high-pressure accumulator. An electronic control and regulating unit is provided for actuating the electrically controllable pressure provision device and/or the electrically controllable shutoff valve so as to regulate the hydraulic pressure which is provided by the pressure provision device and the high-pressure accumulator If a pressure buildup is carried out by activation of the pressure provision device, the high-pressure accumulator is connected only temporarily by at least partial opening of the shutoff valve.

Abstract: The invention discloses a method for determining the air content of the brake fluid in a hydraulic braking system. This method also permits determining the quality of the bleeding of the braking system. The principle of the method is a comparison of the volume intake with the respectively achieved pressure. The correlation is compared to nominal values. As the volume intake is determined by the clearance, the system is set by means of a pre-actuation to an initial condition before each actual measurement.

Abstract: Disclosed is a process for operating a brake actuation unit of a motor vehicle brake system of the ‘brake-by-wire’ type. The brake system has a brake booster, a master brake cylinder, and a pedal travel which interacts with the brake pedal and due to a resetting force acting on the brake pedal can be simulated in the ‘brake-by-wire’ operating mode independently of an actuation of the brake booster, and which can be enabled in the ‘brake-by-wire’ operating mode when the force-transmitting connection between the brake pedal and the brake booster is decoupled and can be disabled outside the ‘brake-by-wire’ operating mode.

Abstract: The invention discloses a method for determining the air content of the brake fluid in a hydraulic braking system. This method also permits determining the quality of the bleeding of the braking system. The principle of the method is a comparison of the volume intake with the respectively achieved pressure. The correlation is compared to nominal values. As the volume intake is determined by the clearance, the system is set by means of a pre-actuation to an initial condition before each actual measurement.

Abstract: Method for monitoring an electrohydraulic braking system. The volume uptake is determined by the elasticity within the wheel brake that is subjected to certain fluctuations, on the one hand, and to a much greater degree by the clearance that is present, on the other hand. To make a reliable statement relating to the air charge, an estimation of the current clearance is first made, taking three ranges into consideration. If there is a normal clearance, a top evaluation threshold is taken as a basis, which assumes the clearance lies at the upper end of the normal range. When said evaluation threshold is exceeded, an alarm is triggered. If the clearance is assumed to lie at the bottom limit of the normal range, a bottom evaluation threshold applies, however, an alarm is only triggered in this case this situation has occurred several times in succession.

Abstract: The present invention relates to a method and a device for monitoring a brake system for motor vehicles equipped with an electronic controlling and regulating unit, as well as a hydraulic pressure accumulator that is used as an auxiliary pressure source and subdivided by a media-separating element into two chambers, the first chamber being filled with a gas and the second chamber being filled with a liquid pressure medium. To conduct a reliable monitoring of the pressure accumulator, the invention provides that the number of the partial strokes of the media-separating element is detected. To this end, brake actuations are weighted and counted according to their duration and intensity. When the sum of the weighting factors reaches a predetermined number, a warning indicates an imminent damage to the media-separating element. This renders it possible to use a less costly and less sensitive media-separating element, which obviates the need for extensive protective measures against mechanical loads.

Abstract: Method for Monitoring an Electrohydraulic Braking System Indications of the enrichment of brake fluid with air are obtained from the comparison of the volume uptake of the wheel brakes at a specific wheel brake pressure with an evaluation threshold in a p/v diagram. The volume uptake is determined by the elasticity within the wheel brake that is subjected to certain fluctuations, on the one hand, and to a much greater degree by the clearance that is present, on the other hand.

Abstract: To improve the control behavior of an automotive vehicle control system, such as an anti-lock system (ABS), a driving stability control system (ESP, ASMS, DDC), etc., in a brake system which includes a master cylinder, inlet and outlet valves for pressure modulation, a low-pressure accumulator, and a hydraulic pump for returning the pressure fluid discharged, when a wheel becomes unstable and upon commencement of the ABS control, that branch of the control system to which the unstable wheel is connected is temporarily uncoupled from the master cylinder pressure (pHZ) or initial pressure by closing the pressure fluid conduit in the direction from the wheel brakes to-the master cylinder, and a relatively quick rise of the braking pressure and a quick approach of the wheel braking pressure to the master cylinder pressure (pHZ) and, thus, the wheel lock pressure level is caused by returning pressure fluid from the low-pressure accumulator into this branch.

Abstract: A device for controlling the driving stability of a vehicle includes a detection device for detecting an operating condition of the vehicle, a device for building up braking pressure for at least one of the wheels, and an influencing device which influences the braking pressure of one or more wheels in dependence on the detected operating condition of the vehicle. The above device also comprises a starting device which activates the device for building up braking pressure in idle mode before the commencement of an operating condition which initiates influencing of the braking pressure.

Abstract: To improve the control behavior of an ABS system in an off-road travel situation, a special control mode is activated as soon as such an off-road travel situation is identified. To this end, braking pressure reduction on the wheel of a vehicle axle which is the first to exceed the normal control thresholds is prevented, different from the normal control mode, and the braking pressure on this wheel is maintained constant until reacceleration of this wheel commences. Starting from this time, braking pressure increase is allowed in the wheel brake of this wheel until the normal control thresholds are reached and the special control mode is terminated. The normal control mode applies to the second wheel of the axle concerned as long as the special control mode applies to the first wheel. Subsequently, the special control mode can pass on to the second wheel of the axle, and the first wheel will then ensure that steerability and/or driving stability is maintained.

Abstract: The present invention discloses a method for use in automotive vehicles with an electronically controlled brake system (for example, ABS), wherein for controlling the braking pressure (re)increase during a control operation the rotational behavior of the individual wheels is measured and evaluated to determine braking pressure control signals, and wherein during a braking pressure control operation the braking pressure reduction in the previous cycle (26) is taken into account for the control of the braking pressure reincrease (27).

Abstract: To retain a vehicle on an inclined roadway and when starting uphill, the vehicle speed, the brake pedal application, the drive torque, the operating condition of the vehicle engine, the application of a parking brake, and the activation of the retaining system is determined. When the retaining system is activated and the vehicle speed lies below a limit value, the brake force or the braking pressure is maintained when the brake pedal is applied and no drive torque is sensed; the brake force is increased when the driving engine is switched off and neither the brake pedal nor the parking brake is activated, or when the engine is switched on and neither brake pedal application nor drive torque is sensed. The brake force is reduced when the parking brake is applied, with the engine switched off and the brake pedal not applied, or a drive torque is sensed with the engine switched on. The retaining system is deactivated when the vehicle speed threshold is exceeded and/or when the off-switch is activated.

Abstract: A brake system with electronic braking pressure control, including a braking pressure generator, electrically operable hydraulic valves, and an electronic analyzing, is provided with an acoustic sensor which is used to determine the change-over behavior of the hydraulic valves for the approximate determination of the braking pressure prevailing in the braking pressure generator and/or in the wheel brakes. The measured pressure values, in the capacity of control quantities, are taken into account for braking pressure control or analyzed for monitoring purposes.

Abstract: A hydraulic bake system with electronic anti-lock control includes a multi-circuit braking pressure generator, electrically operable hydraulic valves, low-pressure accumulators which accumulate the pressure fluid that is withdrawn from the wheel brakes in the period of braking pressure reduction wheel sensors, and circuits are used to evaluate the sensor signals and to generate braking pressure control signals. The braking pressure in each wheel is controlled individually by the hydraulic valves. The filling ratio of the low-pressure accumulators or the residual volume is constantly determined and the pressure fluid discharge to the low-pressure accumulators is modified in the course of a control operation as a function of the length of the control and the filling ratio. Initially, there are no restrictions on the anti-lock function, while the rate of fluid flow is drastically reducted in the course of control.

Abstract: To enhance the reliability of a brake system with electronic control of the brake force distribution, a short pressure reduction pulse, which is negligible for the braking process, is applied to the front wheels (VR, VL) during a braking operation, and the reaction of the front wheels to the pressure reduction pulse is sensed. If imbalance of the front-wheel brakes or a defect is concluded from the reaction, the limitation of the pressure rise in the wheel brakes of the rear wheels (HR, HL), which is an effect of the brake force distribution control, is minimized or eliminated. Thus, the rear wheels provide an increased contribution to the braking process in this situation.

Abstract: In a cornering identification method which, in particular, is provided for automotive vehicles with anti-lock control or traction slip control, the rotating velocities of the two wheels of the one (non-driven) axle are measured and a correction value is continuously determined for the difference in the rolling circumferences of the tires of the two wheels. A reference value (THR) is developed which is representative of a straight-line course and, in accordance with a predetermined time pattern, this reference value is continuously corrected in dependence on the velocity difference of the two wheels. For cornering identification, a velocity difference value (DIF) is compared with the reference value (THR). At the beginning, i.e., after the start of cornering identification, the reference value (THR) will be corrected in relatively short periods which will be prolonged as the ride goes on. The rate of change (.DELTA. THR) of the reference value (THR) is likewise high at the beginning, decreasing thereafter.

Abstract: A circuit configuration for an automotive vehicle with anti-lock control and/or traction slip control is equipped with wheel sensors (S1-S4), with circuits for handling and evaluating the sensors signals (respectively 1 and 2-4) and for generating braking pressure control signals and/or traction torque control signals. Further, a compass or compass system (7) is provided whose output signals are feedable to the evaluation circuits (4) and evaluatable for improving control, for identifying cornering, for assessing the driving stability etc. or also for monitoring proper operation.