Abstract: A hydraulic dual-circuit brake system for a road vehicle with front-axle/rear-axle brake circuit division has a tandem main cylinder as a brake device. The primary output pressure space of the cylinders is associated with the front-axle brake circuit, and the secondary output pressure space of the cylinders is associated with the rear-axle brake circuit. A pressure modulator adjusts the front-axle/rear-axle braking force distribution in the direction of an approach to the, in each case, ideal braking force distribution, as a braking-pressure actuator for the rear-axle brake circuit. The pressure modulator has a drive pressure space, by the charging of which with the output pressure of an auxiliary pressure source under solenoid valve control, a braking pressure which can be coupled into the rear-wheel brakes can be built up in an output pressure space of the pressure modulator.

Abstract: An all-wheel steering control or regulating device for vehicle rear wheel steering, which is motor-driven and permits any desired predeterminable steering angles of the rear wheels as a function of the steering angles of the front wheels or other parameters. In the event of error detection in the system, a drive motor of the rear wheel steering is switched to an inoperative condition and a hydraulic positive coupling between front wheel steering and rear wheel steering is simultaneously established by means of separate piston-cylinder units, with the result that the rear wheels are steered simultaneously with the front wheels.

Abstract: A twin master cylinder for a road vehicle brake system has master cylinders assigned respectively, to a front-axle brake circuit and to a rear-axle brake circuit. The master cylinders are arranged laterally next to one another in a common housing and are each actuable via an arm of a pivotable rocker with a variable ratio L1/L2 of the lengths L1 and L2 of arms of the rocker. A supporting element is provided which, by its support point on the pivotable rocker, marks the pivot axis of the rocker and, by support on a push-rod piece, transmits the actuating force acting on piece to the rocker. The supporting element is arranged between the rocker and the supporting surface of the push-rod so as to be displaceable transversely relative to the direction of exertion of the actuating force.

Abstract: A steering control system executes an automatic intervention in the steering of the rear axle when a .mu.-split condition is detected, in order to stabilize the tracking of the vehicle. The steering always takes place in the direction of the vehicle side on which the higher braking torque is generated; this applies also to cornering, irrespective of whether the lower .mu.-value is on the inside of the bend or on the outside of the bend and, furthermore, irrespective of whether the vehicle is being braked or accelerated.

Abstract: The subject-matter is a motor vehicle having a drive system which acts on the wheels of an axle via an automatic limited-slip differential (ASD) in dependence on the driving speed and on the slip of the driving wheels, rotational-speed sensors being provided for each vehicle wheel and a control logic circuit being provided which processes the signals of the rotational-speed sensors and other signals to form control signals for connecting and disconnecting the limited-slip differential, taking into consideration the driving-dynamic aspects in the respective driving condition, the limited-slip differential being combined with a wheel slip control (ASR) which exclusively acts on the drive torque of the vehicle engine in order to ensure a high measure of traction and driving stability overall with low expenditure.

Abstract: A hydraulic telescopic shock absorber wherein damping characteristic can be varied by means of an electromagnetic valve arrangement, the coil of which is accommodated so as to be protected against the hydraulic medium of the shock absorber. The control preferably takes place as a function of the pressure difference between the spaces above and below the piston of the shock absorber.

Abstract: A brake pressure setting device suitable for both an antilocking control system and drive slip control system is provided and uses a pressure modulator designed as a stepped cylinder defining a modulation chamber which can be connected to the main brake pipe of the brake circuit of the driven vehicle wheels and a control pressure space separated from the modulation chamber by a modulator piston. The control pressure space anc be connected to a pressure outlet of an auxiliary pressure source of alternatively to its non-pressurized sump tank for driving the pistion. A return spring biases the piston into a position associated with maximum volume of the modulation chamber. Connecting the control pressure space to the pressure outlet of the auxiliary pressure source moves the modulator piston into an end position provided for normal brake operation and suitable as an initial position for antilocking control system operation.

Abstract: A control variable propulsion control is obtained by taking the difference between: vehicle acceleration sensed by an accelerated sensor and vehicle acceleration derived from a driven axle or a driven wheel rotational speed as sensed by a high resolution sensor for vehicle speeds below a predetermined speed; and between vehicle acceleration derived from non-driven axle or non-driven wheels via a conventional rotational speed sensor and acceleration derived from speed sensed by the high resolution sensors for vehicle speeds above the predetermined speed.

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 vehicle speed, the lateral acceleration and control signals of the propulsion control. The logic circuit may also be used for changing the increase and adjusting speeds of the control elements of the propulsion control, and for connecting the drive of the wheels of an additional axle and disconnecting it again directly or under certain conditions, in a delayed way.

Abstract: The stabilizer of the present invention has a divided torsion bar, the parts of which can be controllably coupled together or separated from one another by a clutch arrangement. The clutch arrangement is switched to the operative condition when a relatively large transverse acceleration of the vehicle occurs or is anticipated. In this arrangement, the value of the transverse acceleration to be expected is preferably determined from the particular steering angle or the particular rate at which the steering angle changes as well as the particular driving speed by means of a computer controlling the clutch arrangement.

Abstract: A method and apparatus for controlling brake pressure having a brake booster and a pedal-actuated brake valve, in order to effect parallel feeding of the pressure medium fed via the brake valve into a primary main booster chamber. A feed valve is arranged such that displacement volumes in the wheel brake cylinders, in particular, are equalized by means of direct pressure feeding. The triggering of the feed valve is effected based on the result of comparison of travel or pressure variables detected by transducers in the vicinity of the master brake cylinder.

Abstract: In a brake pressure setting device suitable for both an antilocking control system and a drive slip control system, a pressure modulator unit designed as a stepped cylinder is provided with a modulation chamber which can be connected to the main brake pipe of the brake circuit of the driven vehicle wheels and a control pressure space separated from the modulation chamber by the modulator piston. The control pressure space can be connected to a pressure outlet of an auxiliary pressure source or alternatively to its non-pressurized sump tank. The modulator piston is urged by a return spring into a position corresponding to maximum volume of the modulation chamber. Connecting the control pressure space to the pressure outlet of auxiliary pressure source moves the piston into an end position corresponding to a minimum volume of the modulation chamber.

Abstract: A hydraulic brake booster is proposed, in which a coupling is provided between a control valve and a booster piston. The coupling engages the control valve at a slide sheath and upon the movement of the booster piston causes it to move as well, in such a manner that tracking control is provided. A pedal push rod in this manner always keeps a certain distance from the booster piston; that is, it does not touch it. However, if the auxiliary force should fail, then the pedal push rod does touch the booster piston, and its force is transmitted mechanically.

Abstract: For a road vehicle with front axle/rear axle brake circuit subdivision, in which the rear axle brake circuit is designed as a static brake circuit with an antilocking system operating on the pump-back principle providing brake pressure control according to the select-low principle and in which the return pump is designed as a hydraulically driven piston pump whose valve chamber is connected via an inlet non-return valve to the section of the main brake pipe of the rear axle brake circuit branching off to the rear wheel brakes and, via an outlet non-return valve, to the pressure outlet of the main brake unit associated with the rear axle brake circuit. The section of the main brake pipe extending between the connection positions of the two non-return valves can be shut off by means of a single brake pressure control valve designed as a 2/2-way solenoid valve.

Abstract: An antilocking system for a road vehicle with static brake circuits operates on the principle of pressure modulation when brake pressure changes demanded by the control system remain small by changing the volume of a pressure modulator modulation chamber, which can be connected and disconnected to the wheel brake via an inlet valve. If larger brake pressure changes are necessary, the antilocking system operates on the pump-back principle, according to which brake fluid is pumped back via an outlet non-return valve from the modulation chamber into an output pressure space of the brake unit of the brake installation and before a further brake pressure reduction takes place in response to a renewed increase in volume of the modulation chamber. To permit switching from the pressure modulation to pump-back operation, the inlet valve is designed as a spool valve mechanically controlled by a hydraulically driven step piston, which forms the movable boundary of the modulation chamber.

Abstract: The proposed vehicle brake system includes a brake fluid pressure device embodied as a brake booster, front wheel brakes rear wheel brakes and an anti-skid apparatus having values for maintaining, reducing and increasing brake pressure. One of the brake pressure maintenance valves is associated with the rear wheel brakes and is further developed into a valve combination, which additionally includes a brake pressure regulating valve. The valve combination includes only one valve seat and one valve element, which serves both for keeping braking pressure constant in the anti-skid situation and to limit the rear wheel braking pressures during braking. The valve element is controlled on one side by a control piston acted upon by brake pressure and on the other by an electromagnet.

Abstract: An antilock brake system includes a pressure modulator having a step piston. The smaller step defines a primary chamber connected to the wheel brake and the larger piston step defines a driving pressure space that is alternatively connected to the high pressure output of an auxiliary pressure source or to its unpressurized storage reservoir by a control valve. By the admission of pressure to the driving pressure space, the modulator piston, against the restoring force of a strong restoring spring, is forced into its initial position corresponding to the minimum volume of the primary chamber. For a pressure reduction phase, the driving pressure space is connected with the storage reservoir of the auxiliary pressure source, so that, under the combined effect of the brake pressure in the primary chamber and of the restoring spring, the piston moves to expand the volume of the primary chamber.

Abstract: A device for controlling at least one variable influencing the drive torque of a motor vehicle uses the difference between acceleration of a driven wheel and the vehicle longitudinal acceleration as a control variable. The exceeding of a slip threshold within specific time windows after the driven wheel speed has fallen below the threshold or after increasing the drive torque is used as a check for the correct dosage of drive torque and the slip threshold itself is adjusted depending on the vehicle longitudinal acceleration. This permits an optimum propulsive acceleration and the control device to adapt to changing road conditions.

Abstract: An antilocking braking system which operates by controlling the pressure reduction and pressure build-up phases at vehicle wheel brakes by changing the volume of a primary chamber of a pressure modulator, to which the wheel brakes are connected via a brake pressure 2/2-way solenoid controlled valve and an inlet valve. The primary chamber of the pressure modulator is connected to a pressure output of a brake booster. The pressure modulator is designed as a hydraulically driven pump whose feed volume per stroke corresponds to approximately 25% to 50% of the maximum brake fluid quantity which can be expelled into the connected brake circuit, and if, when the inlet valve is closed, one stroke of the pump is not sufficient to achieve a required pressure reduction at the connected wheel brakes, then the pump is switched to a return feed mode in that the brake pressure control valves are driven to their blocking positions and the inlet valve is driven to its open position.

Abstract: A brake unit having a hydraulic brake booster and twin master cylinders in a common housing. The brake booster comprises a drive cylinder between the master cylinders which can be subjected to the outlet pressure of a brake valve of the brake booster which supplies an outlet pressure proportional to the pedal travel. A compensating cylinder, which jointly executes the strokes of the drive-cylinder piston and can likewise be subjected to the outlet pressure of the brake valve transmits the actuating forces generated by the drive cylinder to the pistons of the master cylinders via a rocker articulated pivotably on the compensating piston. The effective piston surface of the compensating cylinder is somewhat larger than that of the drive piston.