Brakes – Internal-resistance motion retarder – Controlled by an operator remote from retarder
Patent
1994-08-24
1996-01-30
Ballato, Josie A.
Brakes
Internal-resistance motion retarder
Controlled by an operator remote from retarder
188 111, 1374875, 25112921, F16F 946, B60G 1708
Patent
active
054874556
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention is related to a directly actuated vibration absorber valves and more particularly to directly actuated vibration absorber valves for controllable vibration absorbers with a pressure-unbalanced valve body being actuatable by an electromechanical transducer.
BACKGROUND OF THE INVENTION
A vibration absorber valve of this kind is known, for example, from the German patent specification No. 37 12 477. The particular feature of the prior-art vibration absorber valve consists in that at least a part of the front surface of its valve body and valve seat are disposed at a distance from each other (the ratio of the pressurized front surface relative to the rear pressurized front surface being 0.5-1 and the ratio of a pressurized annular surface relative to the rear pressurized front surface being 0-0.5). This design provides for an optionally adjustable vibration absorption in the traction stage and in the thrust stage. This function is made possible primarily due to the hydraulically pressurized functional surfaces of the valve body, the switching behavior of the armature design and the use of a solenoid which forms the electro-mechanical transducer.
The above referenced vibration absorber valve has the disadvantage that the (particularly in the range of low volumetric flow rates which pass through the vibration absorber valve) no restricting function can be attained independent of the absorber pressure. In the range of the pressure-dependent restricting function the above referenced vibration absorber valve represents a control loop which determines its dynamic behavior, so that a controllable vibration absorber equipped with such an absorber valve is less adapted for use in a semiactive chassis regulating system. A further advantage is seen in the fact that the family of characteristics of a vibration absorber of this kind is fixed by the dimensioning of the component parts of the vibration absorber valve and cannot, for example, be modified during driving in the event of an adaptive chassis control action.
It is, therefore, the object of the present invention to propose a vibration absorber valve of the kind which the influence the absorber pressure has on the restricting function in the range of low volumetric flow rates is minimized. Simultaneously the dynamic behavior in the chassis regulating process is to be improved. A further object is provide a vibration absorber valve that can be electrically altered to provide a family of response characteristics.
According to the invention, this object is attained in that the valve body is directly coupled to a measuring apparatus which monitors the actuating travel of the valve body and whose output signal is conveyed to an electric circuit which actuates the electromechanical transducer in such a way that in a first range of volumetric flow rate a restricting function and in a second range of volumetric flow rate a pressure-limiting function are performed.
As to process, the solution of the forementioned object consists in that the output signals of the regulator are conveyed, on one hand, to a comparator circuit Jointly with output signals of the measuring apparatus monitoring the actuating travel of the valve body and, on the other hand, to a first amplifier, within said comparator circuit a differential value being formed which is transmitted to a second amplifier, and in that the output signals of the two amplifiers are conveyed to a variable delimiter which limits the output signals of the second amplifier depending on the output signals of the first amplifier and conveys them to the electrical output stage of the vibration absorber valve.
In an advantageous further development a further improvement of the dynamic behavior of the inventive vibration absorber valve is attained in that the electromechanical transducer is configurated in the shape of a plunger coil which interacts with a permanent magnet and whose carrier forms the valve body.
Favorable conditions for a balancing of forces of flow occurring within the absorber val
REFERENCES:
patent: 4638670 (1987-01-01), Moser
patent: 4880086 (1989-11-01), Knecht et al.
patent: 5067687 (1991-11-01), Patel et al.
patent: 5180039 (1993-01-01), Axthammer et al.
Ballato Josie A.
ITT Automotive Europe GmbH
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