Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1992-11-13
1994-06-07
Michalsky, Gerald A.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
13762564, 25112904, F16K 3106
Patent
active
053182693
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns an electronic control system for magnetic valves which are operated individually or in cascade.
Different drives can be used for the actuation of valves. Valves can be provided with a magnet drive for controlling low outputs, while higher outputs require a hydraulic drive. Accordingly, with lower output requirements a magnetic valve operated individually can be electrically adjusted by means of a regulator. With higher output requirements a magnetic valve is connected upstream of a hydraulically actuated main valve and the pressure medium for actuating the main valve is controlled via the magnetic valve. Together with the main valve, the magnetic valve forms a valve cascade in which the magnetic valve is operated as a pilot valve. The regulating voltage put out by the regulator does not act directly on the main valve which is actually to be adjusted, but rather is applied to the controlling magnet of the magnetic valve. A regulating voltage can be derived from a comparison between the reference value and actual value of the position of the main valve, which regulating voltage controls the magnetic valve connected upstream in such a way that the valve position of the main valve is adjusted to the reference value.
The electronic control system used to generate the regulating voltage is usually accommodated in a control unit arranged separately from the valves. Depending on the type of valve--individually operated magnetic valve or valve cascade including pilot valve and main valve--different circuit arrangements are used for the two different types of control. This has the disadvantage that the construction of the electronic control system must be adapted to the respective operating type - individual operation or pilot operation.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an electronic control system of the above mentioned type, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in an electronic control system for individually operated magnetic valves and for valve cascades with a magnetic valve operated as a pilot valve which controls a main valve acted upon by a pressure medium, a regulator generating the regulating voltage for the magnetic valve, characterized in that a signal input for the actual valve of the valve position of the main valve is connected with a switching logic which adjusts the electronic control system to individual operation when a constant level characterizing the individual operation is present at the control input or adjusts the electronic control system to pilot operation when the actual value of the valve position of the main valve is present at the control input, a regulator derives the regulating voltage from a comparison of the reference value with the actual value of the magnetic valve in individual operation and from a comparison of the reference value and actual value of the main valve in pilot operation.
When the electronic control system is designed in accordance with the present invention, it has the advantage over the prior art that a switching logic automatically adjusts the control from individual operation or pilot operation depending on the utilized valves. To this end the switching logic detects whether or not an actual value of a main valve is present at the control input provided for this purpose. If the valve to be controlled is an individually operated magnetic valve there is compulsorily no corresponding actual value at the signal input for the main valve, rather a constant level is applied to this control input. This constant level is detected by the switching logic and the electronic control system is thereupon switched to individual operation. If the electric line to the d.c. voltage source supplying the aforementioned constant level is interrupted, this disturbance is detected by the switching logic which can then
REFERENCES:
patent: 4266572 (1981-05-01), Schuttenberg et al.
patent: 4635682 (1987-01-01), Walters
patent: 4928730 (1990-05-01), Ando
Latt Martin
Oettinger Rolf
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