Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1990-12-21
1993-05-11
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 87, 3031191, B60T 832, B60T 844, B60T 848, B60T 1312
Patent
active
052095541
DESCRIPTION:
BRIEF SUMMARY
INTRODUCTION
The present invention relates to vehicle brake systems including slip control.
BACKGROUND OF THE INVENTION
Slip-controlled brake systems for use with automotive vehicles have previously been adequately described and are thus known in the art. DE-OS 35 05 410 already discloses a slip-controlled brake system comprising a master cylinder serving as a brake pressure generator and exhibiting a hydraulic brake force booster coupled thereto. The auxiliary pressure supply system includes a hydraulic pump supplying, in slip-controlled decelerating processes, after passing a number of check valves series-connected in the pressure fluid circuit, an auxiliary pressure in proportion to the pedal force, to the wheel brakes after opening of the inlet valves electromagnetically excitable by means of an electronic control unit. This pressure modulated by the dynamic pump frequency and the switch frequency, through the fluid and the vibratory conduit system, is transmitted to the master cylinder such that, in particular, in response to the switch frequency of the inlet and outlet valves, all mass-loaded parts associated to the brake system which, as a consequence, constitute a vibratory structure under consideration of the specific self-oscillation number, tend to build up resonant vibrations. Apart from the additional mechanical strain on the brake system to be considered thereby, as a result of pressure pulses of varying intensity, a noise level, in some instances considered disturbing, is to be deemed a disadvantage involved with the state-of-the-art brake system.
BRIEF DESCRIPTION OF THE INVENTION
It is, therefore, the object of the invention to improve a slip-controlled hydraulic brake system to the extent that the above-described disadvantageous development of audible noise, as a result of the pressure pulsation caused by non-steady flows, is minimized, at the same time permitting a coat-reducing modification of the brake system and the conventional mechanical construction to be almost maintained.
This problem, in the practice of the invention, is solved by providing a slip-controlled brake system characterized by a comparatively simple integration of elastomeric pressure pulsation attenuators located between the valve means and the master cylinder of the hydraulic system.
According to an advantageous form of embodiment of the invention, the energy storing element is made of heterogeneous materials so that, thanks to the combination of different material properties, the degree of deformation can be fixed in response to the hydraulic application of pressure, thereby enabling, for example, a degressive rise in pressure to be realized so that the increased volume of the hydraulic circuit, during non-controlled normal deceleration, is minimized as far as possible.
The use of a natural caoutchouc or rubber serving as a raw material for manufacturing and refining a plastic-type elastomeric material core will permit, in simple and inexpensive manner, the desired property of the energy storage element to be attained, with an adequate rigidity in the overall compound of the body being insured through enclosing the material core by means of a fiber-reinforced envelope.
Additional features, advantages and capabilities of end-use application of the invention will become manifest from the dependent claims and from the following description of a plurality of forms of embodiment showing schematically the hydraulic circuiting logistics along with a structurally suitable form of embodiment for the integration of pressure pulsation attenuators in the brake systems.
The detailed description of the disclosed embodiments makes reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the hydraulic circuit of the slip-controlled brake system including the pressure pulsation attenuators directly coupled to the master cylinder;
FIG. 2 schematically shows the arrangement of the energy storing element according to the invention within the hydraulic circuit between the auxiliary pressure pumps
REFERENCES:
patent: 2495693 (1950-01-01), Byrd, Jr. et al.
patent: 2701583 (1955-02-01), Rux
patent: 3140124 (1964-07-01), Heiland
patent: 3331398 (1967-07-01), Goss
patent: 3495880 (1970-02-01), Gratsch
patent: 3753598 (1973-08-01), Michellone et al.
patent: 4121686 (1978-10-01), Keller, Jr.
patent: 4188073 (1980-02-01), Ishikawa et al.
patent: 4571009 (1986-02-01), Jones
patent: 4715667 (1987-12-01), Otsuki et al.
patent: 4778222 (1988-10-01), Numata et al.
patent: 4790608 (1988-12-01), Burgdorf et al.
patent: 4807945 (1989-02-01), Budecker et al.
patent: 4812777 (1989-03-01), Shirai
patent: 4840436 (1989-06-01), Burgdorf et al.
patent: 4919495 (1990-04-01), Kircher et al.
patent: 4952002 (1990-08-01), Arikawa et al.
patent: 4989925 (1991-02-01), Kohno
patent: 5020864 (1991-06-01), Tanaka
patent: 5031969 (1991-07-01), Siegel
patent: 5035469 (1991-07-01), Geilen et al.
patent: 5058961 (1991-10-01), Mergenthal et al.
patent: 5094599 (1992-03-01), Budecker
Beilfuss Hans J.
Goehring Frank
Vogt Michael
Butler Douglas C.
Lewis J. Gordon
Seitter Robert P.
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