Abstract: A method for providing a signal, representing the longitudinal inclination of a vehicle, for a control unit for the slip control and/or for the control of a quantity describing the yaw rate of the vehicle, measured quantities which can be acquired and processed for ascertaining a signal representing a longitudinal inclination of the vehicle, and/or the ascertained signal representing the longitudinal inclination being transmitted from a control device for the headlight-leveling control to the control unit for the slip control and/or for the control of the quantity describing the yaw rate.

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 hydraulic brake system for a vehicle with an anti-lock arrangement operable by wheel brake pressures are individually variable in front wheel brakes and rear wheel brakes, connected to diagonal brake circuits, of a four-wheeled vehicle, in order to reduce or eliminate a threat of wheel locking. The anti-lock arrangement has at least one return pump per brake circuit. The anti-lock arrangement is equipped with a total of four electrically controllable valves. In each of the brake circuits I, II there is one first valve between the master cylinder and a front wheel brake and one second valve between the master cylinder and the rear wheel brake. All the valves are embodied as normally open valves and are electrically closable. Inlets of each of the return pumps communicate directly with the respective front wheel brakes and indirectly with the rear wheel brakes through throttles. Check valves that open toward the inlets of the return pumps are provided in series with the throttles.

Abstract: The invention relates to a hydraulic vehicle brake system with a master cylinder, with two brake circuits (I, II), with wheel brakes connected to the brake circuits (I, II), and with a wheel slip regulator device disposed between the master cylinder and the wheel brakes, which device has at least one brake pressure modulation valve device and at least one high pressure pump, and with a pump unit associated with this high pressure pump. In the automatic braking operation by means of at least one of the high pressure pumps, the pump unit is used for supplying hydraulic fluid to the high pressure pump. The pump unit has a low pressure pump in the form of a gear pump.

Abstract: A vehicle hydraulic brake system having brake pressure modulation valve assemblies, between a dual-circuit master cylinder and wheel brakes of vehicle wheels. The pump device is embodied as a low-pressure pump with the brake pressure modulation valve assemblies be assigned a first and second return pump and that in the automatic braking mode the first pressure chamber is made to communicate with a first return pump and the second pressure chamber is made to communicate with the second return pump, on the inlet side in both cases. The low-pressure pump, in the automatic braking mode, generates charge pressure for the return pumps that is substantially below a maximum brake pressure, and the return pumps generate the maximum projected brake pressure and serve, in the additionally possible anti-lock mode, to return pressure fluid from the wheel brakes to the master cylinder.

Abstract: During ASR control of spinning drive wheels, the pressure level in the wheel brake with the highest pressure level is modulated by driving a switching valve USV which affects the pressure in all the wheel brakes of the brake circuit, whereas the pressure level in the other wheel brake or brakes is controlled by way of wheel-specific inlet and outlet valves. The intake control valve ASV is kept open through the entire ASR control period. As a result, the electrically actuated ASV can be replaced by a hydraulically actuated ASV.

Abstract: A simplified and improved hydraulic brake system has at least one valve arrangement for the brake pressure modulation in a wheel brake. Furthermore, a high-pressure pump is provided to return pressure medium from the wheel brake into a main brake cylinder in the case of an anti-lock control operation or to deliver pressure medium from the main brake cylinder into a wheel brake during drive-slip control operation. A shut-off valve with a spring-actuated through-flow position and a shut-off position, which can be selected by the pressure at the main brake cylinder end, is arranged upstream on the suction side of the high-pressure pump. The hydraulic brake system with anti-lock and drive-slip control device is used in motor vehicles.

Abstract: An anti-skid brake control system is described which recognizes a driving condition in which it is not possible to sufficiently brake the vehicle. The braking effect can be improved by switching off the anti-skid brake control system for the front wheels and/or at least reducing the driving torque acting on the driven rear wheels.

Abstract: A known vehicle brake system having an anti-lock system has at least one return pump in this anti-lock system, by means of whose pumping pressure a throttle valve located between the master brake cylinder and the at least one wheel brake can be controlled via a control inlet, during an anti-lock mode, out of the normal position into a throttling position, counter to the force of an opening spring. The throttle valve serves to limit brake pressure rise speeds in the wheel brake during an anti-lock mode. It is disadvantageous that upon termination of such an anti-lock mode, the throttle valve hinders the return flow of pressure fluid out of the wheel brake to the master brake cylinder. Brake pressure reductions are therefore delayed. A throttle valve and connected in accordance with the invention has a second control inlet, which communicates with the wheel brake.

Abstract: A known hydraulic vehicle brake system has an anti-skid valve assembly. By this assembly, the at least one wheel brake can be temporarily disconnected from the master brake cylinder and connected to one inlet of a return pump, which furnishes the quantities of pressure fluid flowing out of the wheel brakes both to a damper chamber and, via a damper throttle, to the master brake cylinder and/or the at least one wheel brake. The disadvantage is that all of the pressure fluid pumped by the return pump can sometimes reach the master brake cylinder, disagreeably moving the brake pedal in the direction of its outset position. This can annoy a driver and should be avoided. The improved vehicle brake system has a valve, which in anti-skid operation can be blocked, located between the damper throttle and the master brake cylinder and also has a bypass throttle bypassing the valve. As a result, during anti-skid operation, the brake pedal is not displaced to such an annoying extent.

Abstract: Brake force proportioning system for a vehicle includes a two-way valve in the line between a diagonally connected front and rear wheel. A controller opens the valve continuously in a first region of brake pressure so that the brake force proportioning follows a fixed proportioning characteristic. Outside this region the valve is opened in pulses so that the proportioning follows an ideal characteristic curve. If the controller fails, a pressure limiting valve takes the place of the two-way valve and effects a pressure distribution according to a characteristic parallel to the fixed slope characteristic.

Abstract: A brake system having a master brake cylinder that communicates via brake lines with wheel brake cylinders, a check valve and shutoff valves for the wheel brake cylinders, for anti-skid control, are each incorporated in the master brake lines. A line branches off from the master brake line downstream of the control valve and is adjoined by a return pump, which communicates with the master brake line downstream of the control valve via a return line.

Abstract: When the vehicle speed falls below a predetermined reference speed, the measured vehicle deceleration is used to calculate an extrapolated time when the vehicle will be brought to a complete stop. When the extrapolated time is reached, the brake pressure is automatically applied and maintained until a desired departure is indicated.

Abstract: Brake pressure is increased when the brake pedal is operated and the vehicle falls short of a very slow reference speed v.sub.x, which value is variable and increases as the vehicle deceleration increases. The pressure is maintained until the throttle is applied.

Abstract: A vehicle brake system having at least two brake pressure lines, via which a master brake cylinder communicates with wheel brake cylinders, at least one valve is incorporated in each brake pressure line to close the brake pressure lines in the event of anti-skid control. Each brake pressure line is also assigned a return pump, which bypasses the valve. At least one valve, in the currentless state or with the absence of pressure buildup in a brake pressure line, blocks this brake pressure line and communicates with a control unit for pulsed opening upon pressure buildup in the brake pressure line. Because of the additional disposition of a pressure valve and check valve in a bypass around the pulsed valve, expensive pressure reducers are dispensed with, with little additional expense in the anti-skid control system. Even if the anti-skid control system fails, stability during braking is assured.

Abstract: The differences .DELTA.V of the speed signals of diagonally opposed wheels and the time variation signals of these differences are formed. If at least one of these signals exceeds a prescribed threshold, a curve detection signal is supplied which can be used to shut down the delay of the yaw speed build-up in an ABS.

Abstract: A vehicle brake system comprising a hydraulically controllable 2/2-way valve, which has a first control inlet and a second control inlet. The first control inlet receives its control pressure from a first brake pressure source, while the second control inlet contrarily receives its control pressure from a second brake pressure source, such as a so-called return pump apparatus. The vehicle brake system can be used in passenger cars, vans, small buses, and small trucks as well as motor cycles.

Abstract: In a known anti-skid control system having a brake booster, a servo piston is followed in the actuating direction by a restoring piston. After a partial stroke, the servo piston can reach the restoring piston and displace it. This arrangement is disadvantageously long. In the brake booster proposed here, a restoring piston is displaceably disposed inside the guide bore. This piston has a bottom and bordering on its a cylinder wall open toward the brake pedal. This wall forms a cylinder jacket in which the servo piston is displaceable. The servo piston executes a part of its working stroke at a variable distance from the bottom of the restoring piston. From the time of contact with the restoring piston, the servo piston executes a further working stroke together with the restoring piston, if necessary.

Abstract: An anti-skid apparatus having a valve, which is embodied to form a pressure limiting device between the outlet of a return pump and a master brake cylinder. As a consequence, a high-pressure reservoir can be of smaller capacity and can therefore be less expensive, since the pressure limiting device protects the pressure reservoir and other hydraulic elements from a pressure overload.

Abstract: The invention relates to an anti-skid apparatus operatively positioned between a master brake cylinder and wheel brakes of a vehicle brake system. The anti-skid apparatus protects the wheel brakes from locking. The apparatus includes a controllable master brake line valve, which is open in its basic position and during normal braking; only in anti-skid braking operation does it disconnect the outlet of the return pump from the master brake cylinder.