Electromagnetically controllable valve arrangement

Details Electromagnetically controllable valve arrangement Electromagnetically controllable valve arrangement

1996-08-16

1998-04-07

Poon, Peter M.

Fluid-pressure and analogous brake systems

Speed-controlled

Having a valve system responsive to a wheel lock signal

13759617, B60T 836

Patent

active

057355827

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION



Prior Art

The invention is based on an electromagnetically controllable valve arrangement. From German Published Patent Disclosure DE 42 31 740 A1, a hydraulic anti-lock vehicle brake system is disclosed that is supplemented with a traction control system for four driven wheels and for the accelerated application of brake shoes at the onset of a traction control mode. Brake pressure for the traction control is furnished by self-aspirating return pumps that are part of the anti-lock system and that aspirate pressure fluid from a master cylinder through electromagnetically openable 2/2-way valves, which have relatively large admission cross sections. Two auxiliary pumps are provided to speed up the application of the brake shoes.
German Patent DE 42 32 311 C1 discloses a hydraulic vehicle brake system that while using an anti-lock system is expanded for side-slip traction control of vehicle wheels when cornering, by automatic braking.
In hydraulics in general, valve arrangements are known that comprise a master valve and an auxiliary valve used for hydraulic control of the master valve.
One such valve arrangement, described by German Patent DE 28 20 911 C2, substantially comprises a housing, a master valve with a master valve seat and a master valve closing element, and an auxiliary valve with an auxiliary valve seat on the master valve closing element and a control opening, beginning at and passing through the auxiliary valve seat, and having an auxiliary valve closing element as well as a spring that loads the auxiliary valve closing element; it also has a movable armature for moving the auxiliary valve closing element away from the auxiliary valve seat and thus away from the master valve closing element and has a further movable element that is movable relative to the armature and is magnetically operative. A disadvantage of this valve arrangement is that a diaphragm extends between the master valve closing element and the housing and is threatened upon hydraulic impingement with high pressure, and also that when the master valve is opened the master valve closing element has to displace the armature arrangement that comprises the armature and the further movable element. However, since the displacement force depends on a pressure difference between the two sides of the diaphragm, and because such a pressure difference lessens as the master valve opens, the master valve opens slowly.


OBJECTS AND SUMMARY OF THE INVENTION



Advantages of the Invention

It is a principal object of the valve arrangement according to the invention to provide the advantage that on the one hand the auxiliary valve closing element can be speeded up quickly for rapidly generating hydraulic auxiliary force for the opening of the master valve, and that from the time the master valve closing element opens this element can be speeded up by its armature, especially whenever the armature of the auxiliary valve closing element has already covered a certain stroke path. Because the valve arrangement of the invention is embodied such that the longest stroke path of an armature is the path intended for opening of the auxiliary valve, the associated electromagnet can be relatively small and light in weight and can easily be accommodated inside the anti-lock system.
By means of the provisions recited here in advantageous further features of and improvements to the valve arrangement are possible.
It is another object of the invention to produce an advantageous combination with a hydraulic vehicle brake system that can be arranged for automatic braking, for instance for the sake of controlling side slip traction of vehicle wheels by braking and/or for traction control of driven wheels by automatic braking.
The invention will be better understood and further objects and advantages thereof will become more apparent from the ensuing detailed description of preferred embodiments taken in conjunction with the drawings.


BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a longitudinal section of a first embodiment of th

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