Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1996-07-22
1998-02-03
Ballato, Josie
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031154, 60545, 60578, B60T 840, H02P 705, F04B 500
Patent
active
057136408
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hydraulic braking system with slip control.
It has shown in the braking system described in German patent application serial number P4310061.9 that on quick operation of the brake, the brake force booster still does not fully satisfy the requirement to furnish a maximum possible fluid volume flow in the initial mode of braking. Also, high pressure and a small fluid volume flow is desirable in a subsequent braking mode.
The generic European patent application No. 0 379 329 discloses a hydraulic braking system with slip control which includes a brake pressure generator having a booster piston to actuate a working piston. The booster piston is acted upon by servo pressure from an electrically operable auxiliary pressure source. To this end, a sensor is provided for detecting the relative movement between a push rod and the booster piston and driving solenoid valves to actuate the auxiliary pressure source by way of a control and regulating electronic unit.
Thus, an object of the present invention is to improve upon a braking system of the previously mentioned type to such effect that the mentioned shortcomings are overcome and a maximum possible fluid volume is furnished to the wheel brakes in the mode of quick initial braking.
The desired fluid volume needed during the initial braking mode can be provided either by using an electrically operable filling stage or a reluctance motor acting as a servo drive and having two differently steep rotational speed/torque characteristic curves.
The features set out in the dependent claims provide advantageous embodiments of the present invention which, in conjunction with the other features and advantages of the invention, will be described and explained hereinafter in greater detail with reference to the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a structurally simplified view of one embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The braking system has a diagonal brake circuit allotment. The housing of brake pressure generator 14 accommodates two working pistons 2,15 in tandem arrangement which are operable by means of a push rod 6 guided within a booster piston 8. A first working piston 2, which is provided as a stepped piston and is movable into abutment on the booster piston 8 and the push rod 6, is arranged with its stem within a first pressure chamber of the brake pressure generator 14. The first pressure chamber is subdivided into a chamber 3 and a booster chamber 1 accommodating the booster piston 8. The booster chamber 1 is connectable to another chamber 3' housing another working piston 15 by way of a valve arrangement and, hence, a hydraulic switching arrangement 12.
Further, an auxiliary pressure source including a servo drive 5 and a quick-fill piston 4 is connected to the switching arrangement 12. The push rod 6 is guided within a sleeve-type piston portion of the booster piston 8. The booster piston 8 includes seals both on the sleeve-type piston portion and on the expanded booster piston so as to ensure leakage-free sealing of the booster chamber 1. To the effect of a reaction delaying characteristic improving the feeling for a manual actuation, the brake pressure input is performed by way of a rubber reaction disk 11 embedded between the booster piston 8 and the working piston 2. The push rod actuation is detected by a sensor means 7, for example, by means of a Hall-type sensor and a permanent magnet, by way of electronic processing of the output signals of the sensor in the control and regulating electronic unit 9, with the requirement of a separate electronic unit being eliminated when the processing of the output signals is effected within the control and regulating electronic unit 9 provided for the ABS/TSC braking operation.
The positioning sensor of the sensor means 7 according to the present embodiment is located in the area between the booster piston 8 and the sleeve of push rod 6. The signal of movement detected by the position
REFERENCES:
patent: 5123717 (1992-06-01), Willmann
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patent: 5161865 (1992-11-01), Higashimata et al.
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patent: 5433514 (1995-07-01), Tsukamoto et al.
English Translation of the International Preliminary Examination Report for PCT/EP95/00055.
Patent Abstracts of Japan vol. 9, No. 46(M-360) (1769)Feb. 27, 1985.
Feigel Hans-Jorg
Neumann Ulrich
Schiel Lothar
Ballato Josie
ITT Automotive Europe GmbH
Lewis J. Gordon
Twomey Thomas N.
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