Abstract: A braking pressure control device for a brake system comprising a braking pressure generator (16), a wheel brake cylinder connected via a brake line (15) with the latter to actuate a brake (18), a braking pressure control circuit which is interposed into the brake line and comprising a piston pump, the outlet valve (9) of which is connectible to the brake line (15), and comprising solenoid operated brake control valves (19, 20), the inlet valve (8) and the outlet valve (9) of the piston pump are arranged on the pump housing (1), and the difference in pressure for opening the inlet valve (8) is such that the inlet valve (8) remains closed whenever the pressure in the return line (21) is below atmospheric pressure.

Abstract: A brake pressure control apparatus for automotive vehicles with an anti-locking control system (ABS) and/or with a traction slip control system (TSS) is presented. In the inlet line to the wheel cylinder an inlet valve is provided which affords a change-over from an orifice function into a flow limiting valve function at a predetermined wheel cylinder pressure. Flow is initially through an orifice (6) in a control slide valve piston (20), held in its initial position by a prestressing spring (23) acting through an auxiliary piston in engagement with control slide valve piston (20). An increase in pressure in the wheel cylinder (13), also exerted in the wheel cylinder pressure chamber (9), to a predetermined level, causes the auxiliary piston (27) to disengage from the control slide valve piston (20), preventing the force of the prestressing spring (23) from acting on the control slide valve piston (20).

Abstract: A valve block, in particular for slip-controlled hydraulic brake systems, includes a plurality of valve domes (10) incorporating magnet coils (1) and insulating casings cast around the magnet coils (1), as well as a contact carrier (2) containing a plurality of electric conductors (4), with the insulating material (10) encompassing the magnet coils (1) forming an integral unit with the contact carrier (2). The resulting design improves manufacturability, functional reliability, modular design flexibility and serviceability.

Abstract: An anti-locking hydraulic brake system in which the pedal is brought into a variable position during a brake pressure control action. A correcting variable is determined in such a way that any pressure rating in the power chamber is correlated with a position of the power piston, the correlation between the pressure and the position roughly corresponding to the ratio of pressure and position during a noncontrolled braking action.

Abstract: A radial piston pump is described with dual pistons which are slidingly accommodated within a bushing coupled end to end to a valve body. Automatically controlled suction and discharge valves for a pressure chamber are arranged one behind the other in the longitudinal axis of the pump. The pistons are sealed by means of elastomeric seals compressed by an end of the valve body and bushing under pressure of a threaded sealing plug installed in the pump housing. The valves, valve body and bushing form a cartridge separately assembled and installed as a unit in the housing. The threaded sealing plug is formed with a damping chamber for damping of pressure pulsations.

Abstract: A brake pressure control system with an anti-locking control is presented which is operated with hydraulic fluid including a master cylinder and a plurality of valves for the modulation of the hydraulic pressure in the wheel cylinders of the wheel brakes during a brake pressure control mode, and at least one motor-driven pump (48). An axially movable rotor (66) of the motor (14) is furnished with a thrust member (49) which shifts upon motor start up to actuate a control valve. The fluid connection between the master cylinder (37) and the wheel cylinder (43) is thereby interrupted almost instantaneously. Also, by actuating the valve, fluid flows through a flow limiting valve (59), delivered by the pump (48), into the wheel cylinder (43). A rapid pressure reduction is achieved in the wheel cylinder.

Abstract: In an anti-lock brake system, a differential pressure limiter (8) is connected in front of the inlet valve (6). This causes a defined pressure gradient to always prevail at the inlet valve (6), what appreciably reduces the noise emission of the valve during an anti-lock braking operation. Since the inlet valve (6) has a slight throttling effect in its opened position, it may occur that on brake operation with cold brake fluid a pressure gradient is generated at the inlet valve (6) which results in the differential pressure limiter closing. It is therefore suggested to arrange a bimetal spring (20) in parallel to the control spring (15) of the differential pressure limiter (8), which bimetal spring expands at low temperatures and cases a force in addition to the spring force of the control spring (15) to act on the control piston.

Abstract: A brake pressure control for use with an automotive anti-locking control system (ABS) and/or a traction slip control system (ARS) is provided. The control comprises a pressure modulator for varying the hydraulic pressure in the wheel cylinder (13) during the brake pressure control mode, with the pressure modulator exhibiting at least one inlet valve and at least one outlet valve (21) associated with the wheel cylinder (13), at least one motor-driven pump (6) for generating a hydraulic pressure, and an electronic controller. The inlet valve is pressure actuated and comprises a piston-cylinder assembly including a piston (7) forcing, upon application of the brake pressure, a filling volume (14) into the wheel cylinder (13), followed by a throttled rise in pressure caused by a throttling flow restriction (16) defined through the piston.

Abstract: A brake pressure control apparatus for automotive vehicles with an anti-locking control system (ABS) and/or with a traction slip control system (TSS) is presented. In the inlet line to the wheel cylinder an inlet valve is provided which affords a change-over from an orifice function into a flow limiting valve function at a predetermined wheel cylinder pressure. Flow is initially through an orifice (6) in a control slide valve piston (20), held in its initial position by a prestressing spring (23) acting through an auxiliary piston in engagement with control slide valve piston (20). An increase in pressure in the wheel cylinder (13), also exerted in the wheel cylinder pressure chamber (9), to a predetermined level, causes the auxiliary piston (27) to disengage from the control slide valve piston (20), preventing the force of the prestressing spring (23) from acting on the control slide valve piston (20).

Abstract: A brake pressure control for use with automotive vehicles having an anti-locking control system (ABS) and/or a traction slip control system (ASR) is described. Provided in the wheel cylinder (16) is a pressure fluid circuit for pressure modulation, which contains, in addition to the wheel cylinder and the pressure fluid pump, an inlet valve disposed upstream of the wheel cylinder, an outlet valve disposed downstream of the wheel cylinder and a pressure fluid accumulator disposed between the outlet valve and the intake side of the pump, with the accumulator, during the anti-locking control mode (ABS-mode) acting as a pressure relief and, also, isolating the rest of the fluid circuit from the master cylinder and the pressure fluid accumulator. A closed circuit is attained in all phases of the anti-locking control mode and, during the phase of pressure decrease in the anti-locking mode, a very rapid pressure decrease in the wheel cylinder is achieved.

Abstract: A load adjustment device is provided with a throttle valve (9) which determines the output of an internal combustion engine and is fastened, fixed for rotation, to a throttle-valve shaft (32), which is mounted in a throttle-valve housing (30). In idle operation, the throttle-valve shaft (32) is adjusted by an electric motor (14) and a four-link gearing (16) connected behind it. This includes a pinion (14) which is arranged on an output shaft of the electric motor (14) and meshes with a gear segment (50) which is connected for drive via a second link (53) to a rotor (54) which drives the throttle-valve shaft (32). Due to the advantageous arrangement of the four-link gearing (16), a very large transmission ratio can be achieved between the output shaft (40) of the electric motor 14 and the throttle-valve shaft (32), so that a very small, cost-efficient electric motor is sufficient.

Abstract: A process is described for positioning the brake pedal during the automatic control mode in an automotive antilocking brake system, in which the pressure in the master cylinder is sensed at a point located where the master cylinder piston sweeps past so that either high or low pressure is sensed depending on the brake pedal position. The pressure sensing is used to generate an electrical signal which is processed in the system controller to it turn generate a control signal transmitted to a pump motor to cause delivery of a volume of fluid to the master cylinder so as to position the brake pedal in the desired position.

Abstract: A brake system is provided which includes a restoring unit by which a restoring force can be applied to the pedal. Since the pedal, at the same time, actuates a control valve 9 determining the booster force, during a restoring operation, the booster force also is reduced. The wall 40 accepting the restoring forces advantageously can be located in the booster housing 5 between the master cylinder 1 and the booster wall 6. Since the wall 40 covers relatively small distances only relative to the booster wall 6, the overall length of the booster housing 5 is not significantly increased.

Abstract: To warn the driver of an automotive vehicle in the event of failure of a component of the actuating apparatus in a brake pressure control device with two control valves which are acted upon by an actuating varied by an actuating variable which is common for both control valves, a separate actuating apparatus is provided for each control valve. The differential pressure between the pressure fluid outlets is permanently monitored.

Abstract: In an anti-lock brake control system having a vacuum brake power booster and a tandem master cylinder, in which the brake pedal is controlled to be positioned forwardly of the initial return position during the anti-lock control mode. This is achieved by variation of the rate of delivery of an auxiliary pump as by switching the pump motor on and off by a switch actuated by the diaphragm of the power booster to provide a signal of the pedal position at the start of an anti-lock control phase. Various switching arrangements described include a Bowden-cable pulled by the diaphragm, a mechanical or an optical switch actuated by the rolling lip of the diaphragm, or an approach switch detecting the approach of the diaphragm and cam-assembly. The core (53) of the Bowden cable (54) is connected with the diaphragm plate (52) of the vacuum brake power booster. The core (53) moves the trigger cam (64). The switch (18) is actuated by the movement of the trigger cam (64).

Abstract: A load-adjustment device having a control element which can act on a throttle valve (e.g.) of an internal combustion engine and which is connected to a driver which is coupled to an accelerator pedal and, in addition, can be moved by means of an electric setting drive, having a desired-value-detection element associated with the driver and an actual-value detection element which cooperates with the desired-value detection element and acts on the electric setting drive, the electric setting drive being controllable as a function of the detected values of an electronic control device. The driver, the control element, the desired-value detection element, the actual-value detection element and the setting drive are arranged in the throttle-valve housing, the driver and the control element being coupled by means of a coupling spring and the control element being urged in the direction towards a stop of the driver.

Abstract: A brake valve for a vacuum brake force booster, wherein the valve body (33) is movably located on the pedal piston (32). The valve body, through two springs (35, 39) is held in a central position in which the brake pedal and pedal piston may move the valve body between booster deactivated and deactivated positions. Two electromagnets (37, 40) are provided which draw the valve body (33) both in the actuating direction and against the actuating direction. In this manner, the valve (17) can be actuated independently of the pedal force, to either release or apply braking pressure as for automatic antislip or traction control.

Abstract: Predetermined types of anti-locking brake systems equipped with a master cylinder and a pump, for controlling the pump, requiring sensors for detecting the position of the master piston within the longitudinal bore 7 of the master cylinder housing 1. Way sensors or way switches are provided for this purpose. The present invention provides a simple arrangement of this type of sensor comprising a reed contact 18 and an annular magnet 20, with the reed contact 18 being cast into a stationary sealing plug 13 of the master cylinder while the annular magnet 20 is inserted into a recess 21 within an extension 9 of the master piston 6 for movement with the master piston.

Abstract: An electrohydraulic pressure control means for use with an anti-locking control system is provided with an integral assembly comprising an electronic controller (1) and a hydraulic unit. The hydraulic unit includes of an element (18) for accommodating electromagnetic valves and a lid (13). The lid (13) encloses coils (5, 6) protruding beyond the valve-accommodating element. The controller (1) and the hydraulic unit are interconnected by a mounting, positioning and anchoring device (3) and by an electrical contact (4). The anchoring device (3) is located in the area of the valve-accommodating element (18). The electrical contact (4) is provided between the lid (13) and the electronic controller (1). The anchoring device (3) absorbs outer forces imparted to the controller (1). The contact (4) provides a shielded and safe electric contact. Moreover, a valve block assembly for use with an anti-locking control system is provided.

Abstract: A braking pressure regulating device, in particular an anti-lock control device for hydraulic brake systems of automotive vehicles, comprising a master cylinder and a pressure modulator for the variation of the hydraulic pressure in the wheel cylinders during the braking pressure control mode. The device is equipped with a motor-driven pump (8) for generating a hydraulic pressure and with an electronic control unit (5) for controlling the valves of the pressure modulator (2). During the braking pressure control mode, the working chambers (10, 15) of the master cylinder (16) are exposed to pump pressure. Caused by the pump pressure in the working chamber (10), the push rod piston (11) and thus the brake pedal (1) disadvantageously are returned into their basic position in prior-art devices. The present arrangement provides that the switching positions of the regulating valve incorporated in the push rod piston are shifted into the cylinder during the braking pressure control mode.