Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Reexamination Certificate
1997-11-17
2001-02-20
Graham, Matthew C. (Department: 3613)
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
C137S596170
Reexamination Certificate
active
06189983
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a solenoid valve with a pressure-limiting functionand to a hydraulic automotive vehicle brake system with automatic brake management comprising such a valve.
German patent application No. 42 04 417 discloses a solenoid valve with a pressure-limiting function of the generic type. The prior art solenoid valve combines functions relating to the control of pressure fluid between the braking pressure generator and the wheel brake and the limitation of the system pressure in the sense of a hydraulically operable pressure-limiting valve during traction slip control. When the system pressure or the maximum pressure is increased by the respectively prevailing pressure of the braking pressure generator, the pressure-limiting function of the valve, which is configured to have a defined switching point, can no longer be performed accurately. This problem is particularly significant when a solenoid valve of this type is used for brake systems intended to perform automatic brake management for driving dynamics control.
SUMMARY OF THE INVENTION
Therefore, an object of the present invention is to prevent the pressure of the braking pressure generator, which is applied to the solenoid valve, from influencing the switching behavior (pressure limitation) of the solenoid valve.
According to the present invention, this object is achieved by the characterizing features of the independent patent claim
1
and, alternatively, by the features of patent claim
10
.
Thus, in the first case, the present invention is based on the idea of applying the pressure of the braking pressure generator to either side of the valve tappet so that the pressure of the braking pressure generator is balanced in all operating conditions. In the second case, the present invention discloses sealing the valve needle in the magnetic core so that the end surfaces of the valve tappet are free from the pressure effect of the braking pressure generator during the pressure-limiting function.
Further features, advantages and possible applications of the present invention can be taken from the following description of two embodiments making reference to the accompanying drawings.
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Dinkel Dieter
Reinartz Hans-Dieter
Volz Peter
Graham Matthew C.
ITT Manufacturing Enterprises Inc.
Rader & Fishman & Grauer, PLLC
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