Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
2000-01-07
2001-11-27
Oberleitner, Robert J. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C303S119200, C303S115200, C303SDIG001
Reexamination Certificate
active
06322165
ABSTRACT:
The invention relates to an electronically controllable brake actuation system for motor vehicles, with a master brake cylinder, a pressureless pressure medium reservoir, a simulator which works in cooperation with a master brake cylinder, a pressure source which can be controlled by means of an electronic control unit, by means of which pressure can be applied to the wheel brakes of the vehicle, which source can be connected by means of at least one hydraulic connection, which can be shut off with a separating valve, to the master brake cylinder, with a device for the recognition of the driver's wish to slow down, as well as with at least one separating piston arrangement, which is connected before the wheel brakes, whose first chamber can be connected to the master brake cylinder, and whose second chamber can be connected through a valve device with the pressure source or the pressure medium reservoir.
Such a brake actuation system is known, for example, from DE 3,933,797 A1. The separating piston arrangement which is connected before the wheel brakes, in the brake actuation system of the prior art, presents two separating pistons which are connected one after the other, and which delimit two chambers to which are connected, on the one hand, the pressure spaces of the master brake cylinder and, on the other hand, in pairs, the wheel brakes. A chamber which is connected before the first separating piston is connected to the pressure source by means of a hydraulic line, into which an electromechanically activated 2/2-way valve is inserted, preferably one which is closed without current. A second line which can also be shut off or opened by a second 2/2-way valve, which can be actuated electromechanically and which is also closed without current, connects the second chamber with the pressureless pressure medium reservoir.
In the brake system of the prior art, a feature which should be considered less advantageous is the digital control of the 2/2-way valve, which is inserted in the connections between the separating piston arrangement and the pressure source or the pressure medium reservoir, because it results in different maximum opening durations (pulse amplitude and modulation), so that the valves are less suited for the regulation or the metering of the hydraulic pressure which is introduced in a controlled manner into the second chamber.
Consequently, the object of the present invention is to improve an electronically controllable brake actuation system of the type mentioned in the introduction, in such a manner that the metering of the brake pressure is considerably improved.
According to the invention, this object is achieved by the construction of the valve device with a multiple position valve of the slide type, and by the insertion of a switching seat valve in the connection between the multiple position valve and the pressure source.
Advantageous variants of the brake actuation system according to the invention can be obtained from the Secondary Claims
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“Four Channel Proportional Brake System Using 3-Way Isolation Valves” Research Disclosure, No. 371, Mar. 1, 1995, p. 175 XP000512389.
“Hydraulic Boosted Brake System with Proportional Valve ABS/TCS/Chassis Control/Smart Braking Intervention” Research Disclosure, No. 385, May 1996, p. 286 X000599711.
Bayer Ronald
Jungbecker Johan
Klein Andreas
Kunze Lothar
Neumann Ulrich
Continental Teves AG & Co. oHG
Oberleitner Robert J.
Pezzlo Benjamin A.
Rader & Fishman & Grauer, PLLC
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