Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
1998-12-30
2001-03-27
Graham, Matthew C. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303S186000, C303S009620
Reexamination Certificate
active
06206485
ABSTRACT:
The present invention relates to an electronically controlled brake force distributor for automotive vehicles according to the preamble of patent claim
1
.
A brake force distributor of this type is disclosed in German published patent application No. 33 01 948. In this brake system, an electromagnetically operable, normally-closed valve is inserted into the pressure fluid conduit which leads to the rear-wheel brakes. This valve is switched to open by way of a variable pulse train during each braking operation. Wheel slip occurs at the rear wheels which is limited to a predetermined percentage of the front-wheel slip. When the brake circuits have a diagonal allotment, a similar valve or a valve which is controlled hydraulically as a function of the pressure in the rear-wheel brake of the first circuit is also arranged in the pressure fluid conduit to the second rear-wheel brake. When the power supply fails, it is only possible to brake the front wheels in this prior art system.
An object of the present invention is to eliminate this drawback and to develop an electronically controlled brake force distributor by simple and functionally reliable means and by properly utilizing the adherence between the road surface and the rear wheels, which enables the rear wheels to effectively contribute to the deceleration of the vehicle even in the event of malfunctions in the electric components or circuits.
According to the present invention, this object is achieved in a brake force distributor of the generic type by the characterizing features of patent claim
1
. Further features, advantages and possible applications of the present invention can be seen hereinbelow in the subclaims and the description of several embodiments.
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Bleckmann Hans W.
Feigel Hans-Jorg
Graham Matthew C.
ITT Manufacturing Enterprises Inc.
Rader & Fishman & Grauer, PLLC
Siconolfi Robert A.
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