Abstract: A brake unit for a road vehicle with a hydraulic dual-circuit brake system having two master cylinders, the brake booster and elements for antilock and/or propulsion or slip control in a common housing. A brake booster drive cylinder which can be subjected to the outlet pressure, proportional to the pedal travel, of a brake valve, is arranged between static master cylinders. Coupled to the piston of the drive cylinder is a pivotable rocker, the arms of which are each supported on one of the master cylinder pistons via tappet. Assigned to at least one of the master cylinders is a regulating cylinder having an opposed piston which can be supported on the piston of the master cylinder and which, when subjected on one side to the outlet pressure of the auxiliary pressure source of the brake booster, causes the piston of the master cylinder to be returnable towards its basic position counter to the actuating force exerted on it.

Abstract: A brake system which has a brake booster, a brake pedal which acts via a travel simulator device upon the brake booster, at least one anti-skid valve, two sensors (S.sub.p, S.sub.I) and a pulse emitter. One of the sensors measures braking pressures. The other sensor (S.sub.I) measures the displacement distances of a piston, which is displaced in the brake booster to effect braking. A comparator connected to the sensors (S.sub.p, S.sub.I) switches the pulse emitter on whenever the piston travels a longer displacement distance than is permissible at a predetermined braking pressure. The pulse emitter controls the anti-skid valve such that a driver who actuates the brake system perceives changes in braking acceleration, and these changes are intended to emphatically cause him to seek a repair facility.

Abstract: An anti-skid brake system has a first brake circuit (I) terminating at two wheel brakes and connected to a dual-circuit master cylinder, a brake pressure modulation valve assembly and a recirculating pump. In an anti-skid situation, in order to reduce brake pressure, fluid is withdrawn from the two wheel brakes by the brake pressure modulation valve assembly and then returned to the master cylinder by the recirculating pump. Associated with a second brake circuit (I), which is likewise connected to the master cylinder and which terminates at two other wheel brakes, is a floating piston assembly connected to the first brake circuit (I). In an anti-skid situation, a pressure reduction, which is performed in the first brake circuit (I) by the brake pressure modulation valve assembly brings about a pressure reduction in the second brake circuit (II), via the floating piston assembly.

Abstract: An automotive engine forming part of a motor vehicle is controlled to avoid slipping or spinning of a driven wheel by controlling the maximum rate of change of fuel which can be supplied to the engine, for example, by limiting the speed of deflection of a throttle flap (6) driven by a servo motor (7). The deflection speed, limited for example by a voltage divider (14) can be controlled as a function of operating parameters of the engine or the vehicle, for example, vehicle speed (V.sub.F), engine speed (n.sub.M), engine loading or a percentage of engine loading, actual wheel slip, actual angle or deflection position of the throttle flap, and the like. Further, non-linearities between deflection of an operator actuated pedal, such as a gas pedal (1) and actual deflection of the control flap (6) can be compensated for, for example, in a difference forming circuit (9) providing an output error signal for the servo motor (7) or by software, e.g.

Abstract: A propulsion control system for motor vehicles for preventing an undesirable spinning of the driven vehicle wheels when their slip exceeds a certain threshold value, having several slip thresholds that are connected or disconnected by a logic circuit as a function of the vehicle speed, the longitudinal acceleration, the steering angle and control signals of the propulsion control. The logic circuit may also be used for changing the rising and adjusting speeds of the control elements of the propulsion control.

Abstract: A propulsion control system for preventing an undesirable spinning of the vehicle wheels to be controlled, particularly of motor vehicles equipped with a multi-axle drive. The reference speed required for the slip threshold formation is formed from the speed of the uncontrolled driving wheels by an integration with a time constant derived from the longitudinal acceleration of the vehicle, by which a falsification of the reference speed signal is kept within limits in the case of a spinning of the uncontrolled wheels.

Abstract: A motor vehicle with an anti-blocking system, with an electronic unit which produces from signals coordinated to the vehicle velocity and the vehicle cross-acceleration an output signal which in case of braking in a four-channel anti-blocking brake system switches the brake regulating method for the rear wheels from "select low" to "select high", which with a three-channel anti-blocking brake system increases the response-slippage value for the regulating commencement of the rear wheel brakes and which with a vehicle equipped with an anti-blocking brake system and an automatically lockable differential, locks this differential. The switching, increase, respectively, locking thereby takes place with a predetermined rise velocity. With a motor vehicle equipped in such a manner, the possible brake path is reduced, especially with differing traction coefficients at the wheels.

Abstract: To improve the reliability of operation of an anti-skid braking system, and to provide a warning indication if malfunction should occur in such a system (ABS), a pressure-responsive switch (6, 62, 63) having two switching elements (S.sub.1 S.sub.2 ; 43a, 44a, 43b, 44b, 46a, 46b, 47a, 47b) is connected to a pressurized hydraulic brake fluid connection line to a control valve for a vehicle brake, the switches providing, respectively, control signals of different levels of pressure applied thereto, and, in case of failure of one switch to respond to a higher pressure level, at which time a pump motor is to be energized to resupply the pressure, a second switch, responsive to a lower pressure value, is provided, providing a further warning indication and, if appropriate, disconnecting the ABS with a disconnect indication to the operator that the braking system is placed back under operator control.

Abstract: A hydraulic multiple-circuit brake system is proposed, the brake amplifier of which has a multiple-chambered refill container. With an intake connection of its pump, an energy supply apparatus comprising a pump and a reservoir is connected at a predetermined fill level (h/2) to the refill chamber which is intended for the supply of an open brake circuit (II). In this manner, it is attained that if there is an energy failure, the open brake circuit will be capable, as a closed brake circuit, of continuing to function.

Abstract: A brake pressure control valve including a housing, a control bushing secured therein, a control slide and a travel simulator movable relative to the control bushing and having a spring. The travel simulator has a pressure piece which is rounded on its side toward the control slide. Toward the pressure piece, the control slide is also rounded. Between the control slide and the pressure piece there is a force transmitting member having two plane parallel end faces. A centering means surrounding the force transmitting member and embodied like a rubber-elastic bushing centers the force transmitting member relative to the longitudinal axis of the control slide and orients the end faces transversely to said longitudinal axis. The control slide, the force transmitting member and the pressure piece form roller pairs, which during the actuation of the brake pressure control valve enable relative movements between the pressure piece and the control slide without generating notable radial force components.

Abstract: A brake booster has a first booster cylinder and a booster piston disposed in it for displacing a rod-like master cylinder piston of a master cylinder which supplies at least one brake circuit (I, II), having a tappet for mechanically displacing the first booster piston as needed if the brake boosting is inadequate, and having a brake valve coupled to the tappet and the first booster piston for direction boosting pressure into the first booster cylinder. A second, annular booster piston surrounds the rod-like master cylinder piston and likewise has a booster cylinder. Thsi second booster piston is joined to a pump piston which is likewise annular and sealingly surrounds the rod-like master cylinder piston. When the pressure supply apparatus is in operation, actuation of the brake pedal simultaneously displaces both booster pistons and generates braking pressures in the brake circuits (I, II).

Abstract: A hydraulic brake booster including, master brake cylinder pistons disposed in telescoping fashion in a short housing structure, and a locking piston for the brake pedal actuation is disposed parallel to the master brake cylinder in axial alignment with the travel simulator and a brake valve. A further parallel disposition of an adjusting piston is acted upon by reservoir pressure and in which the master brake cylinder pistons are supported in a slidably displaceable manner.

Abstract: A valve arrangement which assumes at least two positions and a monitoring system which is to monitor the functional performance of the valve arrangement. A valve closing body is connected to a slider which slides in sealing fashion in the opening to be closed by the valve closing body so that the opening is not set free until after lifting of the valve closing body and the slide sets free the opening.

Abstract: A propulsion control system for motor vehicles in the range of the cornering limit speed, having a memory in which the momentary steering angle value is stored when a certain steering angle change is not followed by a change of the lateral acceleration, having threshold value comparators in which the actual steering angle is compared with threshold values that depend on the stored steering angle value, and having logic for transmitting and stop transmitting a signal to a control element for the power reduction of the vehicle engine when the actual steering angle exceeds one threshold value and then falls below the other threshold value. The steering angle may also be replaced by the driving speed or by a combination of both quantities.

Abstract: A motor vehicle having a multi-axle drive that can be connected via an engageable transfer transmission and wheel couplings, and having a differential lock for the wheels of the permanently driven axle, in which case the lock and the couplings can be automatically connected or disconnected as a function of comparative conditions obtained from the speeds of the wheels and of the transfer transmission output shaft as well as the steering angle.

Abstract: A method and an apparatus for controlling characteristic curves in a vehicle brake system having a hydraulic brake booster. At least one supplementary piston is incorporated in the output pressure lines forming preferably closed brake circuits of the brake booster, the supplementary piston being triggered in a regulated manner both for controlling or varying the characteristic curve for anti-skid braking pressure modulation. Optionally, in order to attain predetermined characteristic curve courses, modified travel magnitudes of the brake pedal actuation or of the booster piston are compared with the actual pressure in the brake circuits. The triggering is effected via the magnetic valves.

Abstract: A brake booster, combined with an anti-skid apparatus for a master brake cylinder. The brake booster is controlled by a brake valve and has a first booster piston displaceable by a brake pedal via a tappet for emergency braking and hydraulically pressurizable for braking with brake boosting, and a second booster pinion, which is only hydraulically displaceable. With normal braking, both booster pistons operate simultaneously. In case of skidding the first booster piston is hydraulically fixed in its operative position during a first, low brake pressure reduction and the second booster piston is relieved of boost pressure and performs reductions in brake pressure. If these are not sufficient, the first booster piston is also displaced in the direction of its initial position. Whereby the first booster piston pressures against the tappet via a spring mounted between it and the tappet which, in turn, acts on the brake pedal.

Abstract: An anti-skid brake system and anti-drive-slip system having a master cylinder, at least one inherently safe closed brake circuit which includes anti-skid valves and wheel brakes, a booster cylinder associated with the master cylinder and in which a booster piston is displaceable, a pressure supply apparatus, a valve connected thereto, which is actuatable by means of a brake pedal for controlling brake pressures. A locking piston cylinder connected to the control valve, a sensing piston, which is coupled to the brake pedal and which passes into the locking piston cylinder, and a change-over valve assembly. This change-over valve assembly is embodied such that for normal braking operation, it connects the booster cylinder with the control valve. If there is a danger of skidding, or wheel lock, this change-over valve assembly disconnects the booster cylinder from the control valve and connects it to a return line in order to relieve pressure and reduce the braking pressure.

Abstract: A brake system having a master cylinder for generating brake pressures in at least one closed brake circuit (I, II) and having an associated brake booster including a booster cylinder, a displaceable booster piston having a piston rod oriented into the master cylinder and a tappet arranged to plunge into the booster cylinder by means of a brake pedal and be displaced counter to the booster piston and is equipped with a brake valve connected to a pressure supply device, which brake valve is controllable by means of the relative movement of the tappet with respect to the booster piston. The brake system may be modified to become an anti-drive-slip apparatus via brake pressure maintenance valves built into the brake circuits (I, II), as well as a 3/3-way valve, by means of which pressure medium can be sent directly from the pressure supply device for exerting boosting action on the booster piston into the booster cylinder.

Abstract: A brake valve for feeding selectably different levels of fluid pressure into at least one pressure receiver, which is a component of a vehicle brake system. The brake valve includes a first, normally open valve having a ball and a second valve, which is normally closed by a closing spring and which likewise has a ball. The latter ball is pressed by pressure provided by a pressure supply apparatus against a ball seat. A compensation piston acted upon by this pressure is also provided, which presses against the ball in the opening direction of the second valve. Because of the compensation piston, the second valve is easily opened, so that brake pressure can be sensitively controlled.