Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-12-19
1992-08-25
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303113SS, 303114PN, 92 5R, 91 1, 200 83R, 188 111, B60T 840, B60T 844, B60T 1352
Patent
active
051412950
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a braking pressure control device, in particular an anti-lock control device (ABS-device), and a traction slip control device (ASR-device), for automotive vehicles. The device comprises a master cylinder, wheel cylinders, at least one pump for positioning at least one piston of the master cylinder, a pressure modulator modulating the pressure in the wheel cylinders during the control mode, and an electronic control unit processing the wheel sensor signals to corrective signals for the opening valves and shut-off valves of the pressure modulator. The device further comprising a brake power booster, in particular a vacuum brake power booster which comprises a housing, a piston element, in particular a diaphragm plate, and a diaphragm, such as a rolling diaphragm, which interconnects the piston element and the housing in a sealing manner, and which permits movements of the piston element in relation to the housing, with the piston element being in operative engagement with the brake pedal.
Anti-lock systems are used in the motor vehicle industry in increasingly large numbers. In certain specific applications of these anti-lock systems, hydraulic pumps are used for generating an auxiliary pressure during the control mode. Such an anti-lock device has been described, for example, in German patent application P 3731603.6, corresponding to U.S. Pat. No. 4,826,255.
U.S. Pat. No. 4,826,255 discloses a brake system, in particular for automotive vehicles, comprising a master cylinder, wheel cylinders and a device for anti-lock control. In this brake system, there is provided a pressure-fluid source, in particular a pump, for positioning the piston of the master cylinder in a desired position during the anti-lock control mode. The rate of delivery of the pump is variable, and communicated by way of a hydraulic line with the master cylinder to be able to position the piston in accordance with its rate of delivery.
The present invention has the following objects: It is particularly desired that the brake pedal be positioned forward of an initial, fully retracted position in a particularly simple way during the anti-lock or traction slip control mode. The position of the push rod piston of the master cylinder sets the desired position of the brake pedal forward of its initial position. The further objects of the present invention are to provide an arrangement providing for the stroke of the push rod piston to be defined by a switch which does not enlarge the overall length of the entire assembly, composed of a vacuum brake power booster and master cylinder.
SUMMARY OF THE INVENTION
These and other objects are achieved by this invention in that there is provided a switch operator associated with the power booster diaphragm. In the first embodiment, a switch operator comprises element transmitting a tractive or pulling force, in particular a flexible transmitter or "Bowden" cable, which is coupled to the diaphragm support plate and which actuates a switch controlling the pump, by way of the electronic control unit. Another inventive switching arrangement used in a vacuum brake power booster of the type referred to resides in that the housing, the piston element, in particular the diaphragm plate, and the diaphragm, preferably a rolling diaphragm, are formed as component parts of a travel-responsive switch for the control of the pump, by way of the electronic control unit.
A particularly simple embodiment of this invention resides in that there is provided a travel-responsive switch and a member movable by the Bowden cable core and including a switching ramp which actuates the switch after a predetermined distance has been covered. Also, a cam can be provided which actuates the switch after a specific distance has been covered. In another embodiment, the housing incorporates a limit switch, preferably a mechanical limit switch with roller-type lever which is actuatable by the rolling diaphragm and provides an electric signal for the control of the pump. In a f
REFERENCES:
patent: 2914630 (1959-11-01), Ralston
patent: 3298466 (1967-01-01), Ayers, Jr. et al.
patent: 3703620 (1972-11-01), Watanabe
patent: 3937912 (1976-02-01), Martin
patent: 4140045 (1979-02-01), Hardwick et al.
patent: 4508008 (1985-04-01), Belart
patent: 4580847 (1986-04-01), Burgdorf
patent: 4583071 (1986-04-01), Sebalos et al.
patent: 4617855 (1986-10-01), Wrobleski et al.
patent: 4653813 (1987-03-01), Burgdorf
patent: 4709126 (1987-11-01), Miller et al.
patent: 4804235 (1989-02-01), Matsumura
patent: 4826255 (1989-05-01), Volz
patent: 4828332 (1989-05-01), Lohberg
Burgdorf Jochen
Reinartz Hans-Dieter
Steffes Helmut
Volz Peter
Alfred Teves GmbH
Ballato Josie A.
Lewis J. Gordon
Oberleitner Robert J.
Seitter Robert P.
LandOfFree
Brake power booster with diaphragm position sensing devices does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Brake power booster with diaphragm position sensing devices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Brake power booster with diaphragm position sensing devices will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-380407