Abstract:
The proposal is for braking pressure regulator. It comprises a brake pressure detector (1), a brake actuating device (3) for at least one vehicle wheel, a connecting line (2) between the brake pressure detector (1) and the brake actuating device (3), a lock valve (4) in the connecting line (2) having two switching positions whereby in the basic position of the lock valve (4) the connecting line (2) is open and is closed or throttled in the switching position of the lock valve (4), an outlet line (5) which connects the brake actuating device (3) to a pressure medium manifold (6), an electromagnetically actuated pressure limiting valve (7) in the outlet line (6), a wheel sensor (11) which detects the rotation speed of the vehicle wheel and provides a corresponding sensor signal, and an electric control and evaluation unit (40) having an input (41) for the sensor signal and a first switching output (51). Whereby a switching signal for the lock valve is applied to this output, and a further output (setting output 52) which emits a control signal for the power supply (53) of the coil (54) of the pressure limiting valve (7), which determines the coil current. The wheel cylinder pressure is to be measurable by simple means. To this end, to the coil circuit is allocated a measuring device (55) which detects a current/voltage change through a change in the inductance of the coil (55) and transmits a corresponding signal to another input (43) of the evaluation unit (40).
Abstract:
Proposed is an anti-blocking hydraulic system in which a flow-control valve (20) is disposed between the master cylinder (1) and the wheel brake (3). Between the brake (3) and a low-pressure reservoir (6) is a proportional-action pressure-relief valve (5) which is actuated by a proportional-action magnet. The magnet is designed such that, independently of the length of its stroke, it exerts a defined force which is a function of the current intensity. In this way, the pressure-relief valve can be set to open at any pressure which gives the appropriate brake pressure.
Abstract:
A hydraulic, antilock braking system has a pump (8) and a master cylinder (1). The valve for regulating the pump pressure is integrated in the master cylinder (1) and is composed of a combined seal (30, 34) that cooperates with a compensating bore (36). The seal (30, 34) is composed of an inner elastic ring (37) and an outer sliding ring (38). The communication required between the reservoir (7) and the brake circuits in order to fill up the brake circuits through a nonreturn valve is established through the nonreturn valves (10, 11) of the pump (9). A packing (41) may be added to the double seal (30, 34) in order to reliably seal the working chamber (39, 40) even when small leakage currents occur through the double seal (30, 34).
Abstract:
In order to ensure that no air bubbles are trapped in the pump of an anti-blocking system, the pump (4) is mounted in the main brake line (2) in such a way that, when the brakes are operated, it is flushed with fluid. As soon as the brake pressure reaches about 5 bar, the reversing valve (28) switches over so that the main brake line (2) is blocked in the direction of pressure build-up. Further hydraulic fluid is fed through the auxiliary line (26) anad the inlet-pressure valve (27). Pressure is reduced through the direct line (13). In the event of brake slip control being necessary, the pump aspirates hydraulic fluid from the reservoir (25) through the suction valve (22).
Abstract:
The regulator supply valve (100, 101, 200, 300, 400, 500, 600, 740) of the present invention provides regulated fluid pressure for adaptive braking and traction control systems (10, 710) operation. The regulator supply valve (100, 101, 200, 300, 400, 500, 600) and system (10) may be supplied as an add-on feature for a standard braking system. During adaptive braking system operation, pressure from a chamber (28, 30; 718, 716) of a master cylinder (12, 712) causes the regulator supply valve (100, 101, 200, 300, 400, 740) to communicate a pressure source (35, 720) with modulators (41, 42; 51, 52; 61, 62, 71; 746, 748, 752; 746', 748', 752') for respective wheel brakes (40, 50, 60, 70; 750, 760). During traction control operation an electronic control unit (201, 700) of the system (10, 710) activates a solenoid (104, 106; 204, 206; 304, 306, 404, 406; 504, 506; 604, 606; 783, 784) to cause the regulator supply valve (100, 101, 200, 300, 400, 500, 600, 740) to open controllably the communication between the pressure source (3, 720) and modulator valves (41, 42; 51, 52; 61, 62, 71; 746, 748, 752; 746', 748', 752'). The regulator supply valve (740) may alternatively be located within a boosted master cylinder (712) such that it is activated during both adaptive braking and traction control operation to enable the pressure source (720) to communicate with modulators (746, 748, 752; 746', 748', 752').
Abstract:
In an antilock hydraulic braking system, a throttle is inserted in the throttle valve (8) in the brake line during brake slip control. The pumps (12, 13) pump the hydraulic fluid through the throttle to the wheel brake. The pressure in the wheel brake is controlled only by an outlet valve (11) the open cross-section of which is chosen so that the quantity of hydraulic fluid discharged through the outlet valve (11) is greater than the quantity of hydraulic fluid delivered by the pumps (12, 13) to the wheel brake via the throttle. Hence, when the outlet valve is open, the pressure in the brake decreases, whereas when the valve (11) is closed, the pressure in the brake increases. The invention relates to different ways of controlling the throttle valve (8).
Abstract:
For controlling pressure at the outlet of a pump and for positioning the pedal during brake slip regulation, an auxiliary aggregate containing a transmission piston (5) and a shut-off valve (30) is added to the master cylinder. The pressure in the brake line (18') is applied to the closure element of the shut-off valve through a valve piston (28) against the pressure at the outlet of the pump. The pressure on the valve closure element is therefore equalized, and hence no forces are transmitted to the tappet (37). Consequently, the ramp (40) at the transmission piston (5) need not be specially hardened.
Abstract:
A brake pressure regulating device, in particular an autoblocking device for hydraulic brake systems for motor vehicles, comprises a master cylinder and a pressure modulator for changing the hydraulic pressure in the wheel brake cylinders during the brake pressure regulating mode. The device is fitted with a motor-driven pump (8) for producing a hydraulic pressure and with an electronic regulator (5) for controlling the valves of the pressure modulator (2). During the regulating mode, the working chambers (10, 15) of the master cylinder (16) are under pump pressure. In prior art devices, the pump pressure in the working chamber (10) forces the push-rod pistons (11) and hence the brake pedal (1) back into their normal position. This is regarded as disadvantageous. According to the invention, the switching positions of the regulating valve lodged in the pressure rod piston are displaced into the cylinder during the brake pressure regulating mode. In this way, the brake pedal is not fully restored to its normal position during the regulating mode. Brake pedal operator comfort is thereby enhanced.
Abstract:
Die Erfindung betrifft eine schlupfgeregelte hydraulische Fahrzeugbremsanlage (1) mit einem Hauptbremszylinder (2), an den Radbremszylinder (5) angeschlossen sind. Über Bremsdruckabsenkventile (9) sind die Radbremszylinder (5) an Hydropumpen (10) angeschlossen. Die Erfindung schlägt vor, die Hydropumpen (10) und die Radbrems zylinder (5) über die Bremsdruckabsenkventile (9) an einen auf den Hauptbremszylinder (2) aufgesetzten Bremsflüssigkeitsvorratsbehälter (3) und nicht an den Hauptbremszylinder (2) anzuschließen. Dadurch entfallen zusätzliche Hydrospeicher zur Aufnahme und Zwischenspeicherung von Bremsflüssigkeit aus den Radbremszylindern (5) während einer Schlupfregelung, ein Leersaugen der Radbremszylinder (5) wird vermieden und ein schneller Druckaufbau mit den Hydropumpen (10) bei nicht betätigtem Hauptbremszylinder (2) wird ermöglicht.
Abstract:
A ball screw pump assembly (200) includes a pump body having an axial bore defining a travel chamber (226) and a pressure chamber (225). An input port (230) and an output port (236) are formed in the pressure chamber (225). A ball screw (205) is provided in the travel chamber (226). A piston (220) is connected to the ball screw (205) and slidably extends into the pressure chamber (225) as the ball screw (205) is rotated. The piston (220) divides the pressure chamber (225) into an input chamber having a maximum volume and an output chamber having a maximum volume which is less than the maximum of the input chamber. The ball screw assembly (200) can be used in a vehicular braking system.