Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
1999-08-24
2001-09-04
Oberleitner, Robert J. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303S155000
Reexamination Certificate
active
06283558
ABSTRACT:
The invention relates to a hydraulic motor vehicle braking system with wheel slip controller according to the generic portion of patent claim
1
.
DE 196 139 03 A1 already disclosed a motor vehicle braking system which exhibits a pedal-activated, brake pressure applicator consisting of a vacuum brake booster and a main brake cylinder, and is connected to several wheel brakes by means of suitable brake line connections. In addition, the hydraulic motor vehicle braking system includes a pump that is also connected to the brake lines in order to supply the wheel brakes with a pressure agent for purposes of controlling wheel slippage. Suitable pressure modulation valves are allocated to the wheel brakes to control wheel slippage. The vacuum brake booster should be as large as possible to ensure that it provides the greatest possible servo-assisted effect, as well as to be able to achieve, with a relatively small vacuum, suitably high levels of brake pressure while maintaining short pressure build-up times in the main cylinder during both normal braking operation without wheel slippage and operation involving activation of the anti-lock braking system and vehicle dynamics control system.
This type of system may be disadvantageous for the braking system in general, due to the fact that the vacuum being generated is frequently insufficient and/or a limited amount of space is available for installation of the vacuum brake booster.
Therefore, the objective of this invention is to use the simplest possible, cost-efficient, and well-functioning means to improve upon a hydraulic motor vehicle braking system of the type described initially so that, regardless of the size of the vacuum and the amount of space in the vehicle available for installation of the braking system, the simplest possible, small-scale brake booster can be achieved without the need to accept a limited servo-assisted effect, thus ensuring that all pressure control functions within the braking system remain unchanged.
According to the invention, this objective is solved for a hydraulic motor vehicle braking system of the type described initially by applying the characterizing features of patent claim
1
.
REFERENCES:
patent: 4703978 (1987-11-01), Belart et al.
patent: 4783125 (1988-11-01), Belart et al.
patent: 4793663 (1988-12-01), Ocvirk et al.
patent: 5350226 (1994-09-01), Burgdorf et al.
patent: 5918948 (1999-07-01), Burgdorf et al.
Angenendt Guido
Kley Ronald
Volz Peter
Continental Teves AG & Co. OHG
Nguyen Xuan Lan
Oberleitner Robert J.
Rader & Fishman & Grauer, PLLC
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