FEDERAL REPUBLIC OF GERMANY
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`GERMAN PATENT OFFICE
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`Int. Cl.: F 15 b
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`German Cl.: 60-30
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`PUBLISHED EXAMINED APPLICATION 1 268 494
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`Number: 1 268 494
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`File reference:
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`P 12 68 494.5-13
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`Application date:
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`December 16, 1963
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`Publication date: May 16, 1968
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`Applicant:
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`Licentia Patent-Verwaltungs-G. m. b. H.,
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`6000 Frankfurt, Theodor-Stern-Kai 1
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`Dipl.-Ing. Hermann Ragnar Eggers,
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`5628 Heiligenhaus,
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`has been named as inventor
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`Pulse-controlled actuating device
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`The invention relates to an actuating device, which is controlled by means of electrical unit
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`pulses, using an actuating drive which is driven by a pressure medium and using an
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`electromechanical component, which is connected to a control element of the actuating
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`drive, with return of the output actuating stroke of the actuating drive, which return acts on
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`809 549/247
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`the control element.
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`Various actuating devices in which an electrodynamic force element (plunger coil) adjusts
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`a control element are known.
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`In a known device, the plunger coil is connected to the control device of a piston drive.
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`The control device consists of a pair of control pistons which slide in a slide. The slide has
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`openings at one end and in the center, wherein the opening in the center of the cylinder is
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`subjected to the action of a pressurized liquid which, depending on the position of the pair
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`of control pistons, is conducted to the top or bottom side of an operating piston in a
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`working cylinder. The operating piston is moved in one or other direction depending on
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`whether the pressure on the top side or the bottom side is greater.
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`It is also known for a pneumatic actuating element to connect the electrodynamic force
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`element to a set of scales which forms part of a nozzle/baffle plate system. The
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`nozzle/baffle plate system controls the compressed air which is supplied to a diaphragm
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`drive. A mechanical return connects the output of the diaphragm drive to the set of scales
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`of the nozzle/baffle plate system in order to carry out pressure comparison.
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`These actuating devices both operate with continuous electrical input signals. If pulsed
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`input signals are applied to these actuating devices, an additional device which converts
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`short pulses into a continuous voltage profile is required. This drive device can consist of a
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`stepper mechanism which is moved on in steps by pulses for adjusting a voltage divider.
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`The current which is drawn from the voltage divider can then be supplied to the
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`electrodynamic force elements of the known actuating devices.
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`One disadvantage of this device is that an additional converter is required for converting
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`the pulsed control signal in order to influence the actuating drive, said additional converter
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`- apart from increasing the structural complexity - possibly causing faults and interference.
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`The prior art also includes an actuating device with a continuously operating electric motor
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`which directly influences a valve in the control section. The motor, which is fed with
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`relatively long current pulses, executes rotary movements which correspond to the integral
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`of the pulse height with respect to the pulse length. One disadvantage in this electromotive
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`actuating element is that the rotational distance covered by the motor shaft depends on the
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`pulse height. In addition, friction and the moment of inertia of the moving parts play a
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`considerable role, and therefore a higher degree of accuracy, as is the aim with digital
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`technology, cannot be achieved with this device.
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`This disadvantage is avoided in a known digital control valve. The control valve contains a
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`plurality of magnet systems, each of which is suitable for influencing a valve. The valves,
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`of which the diameters are graded in accordance with the value of the associated digital
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`point, are either entirely closed or opened under the influence of a control current.
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`Although a high degree of accuracy can be achieved with this valve, the control signals
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`have to be in binary-coded form. This electromagnetic valve is not suitable for a control
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`signal that consists of a time sequence of pulses which are independent of significance. An
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`additional converter which generates a dual output variable from a pulse-count-modulated
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`control signal is required.
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`The invention is based on the object of eliminating the disadvantages mentioned.
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`According to the invention, a stepper motor which is known per se and which adjusts the
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`actuating drive by one distance unit with each pulse is provided as the electromechanical
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`component.
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`The pulse-controlled actuating device according to the invention renders a special signal
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`converter superfluous. Actuating devices which are already known can be made suitable
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`for processing pulsed control signals by a stepper motor being used as an
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`electromechanical component for receiving the input variable.
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`One exemplary embodiment of the subject matter of the invention is described on the basis
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`of a drawing containing two figures, wherein figure 1 illustrates a pulse-controlled
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`actuating device, while figure 2 shows the time profile of the output variable of the
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`actuating device as a function of the pulsed input signal.
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`In figure 1, 1 denotes a valve in which a slide 2 for limiting throughflow is seated. The
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`slide is connected to a working piston 5 by means of a working rod 3, which working
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`piston forms the moving component of a pneumatic piston drive 6. Two lines lead from the
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`cylinder which surrounds the working piston to a control device. The control device
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`consists of a control slide 16 with a cutout 10 in the center, said output being subjected to
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`the action of compressed air. A pair 9 of control pistons which can more or less cover the
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`lines 7, 8 which lead to the working cylinder or can connect said lines to the compressed
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`air source is arranged in a movable manner in the control slide. A control rod 11, to which
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`the pair of control pistons is fastened, is routed out of the control slide. A roller 12, which
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`engages with a cable pull 14, is seated in a rotatable manner at one end of the control rod
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`11. One end of the cable pull is connected to a shaft of a reversible stepper motor 15 and
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`the other end of said cable pull is connected to an arm 4 which forms a fixed unit with the
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`working rod 3. A tension spring 13 is fastened to the second end of the control rod 11.
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`According to figure 2, a pulsed electrical input signal xe is fed to the reversible stepper
`motor 15 in the time period t0-t1. A specific rotation direction corresponds to the positive
`pulses, in which rotation direction the rotating shaft of the stepper motor winds up the
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`cable pull 14 while the arm 4 initially remains still for example. As a result, the control rod
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`11 is pulled downward against the force of the tension spring 13 by means of the rotatable
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`roller 12. The lower piston of the pair 9 of control pistons opens the line 8, while the upper
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`piston covers the line 7. This causes a higher pressure on the bottom side of the working
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`piston 5 than on the top side of the piston. Owing to the effect of the differential pressure,
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`the piston is driven upward and the slide 2 opens the valve 1. Without the fixed return by
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`means of the lever 4, the working piston would, in the event of adjustment of the pair of
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`control pistons, move as far as the stop at a speed which is proportional to this movement.
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`The piston drive therefore has an integral time response in principle. Since the reversible
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`stepper motor 15 likewise operates in an integrative manner, non-oscillatory instability
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`would result for the entire actuating device. This is remedied by the piston drive having a
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`proportional time response due to a fixed return; the working rod 3 and the arm 4 which is
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`connected to it move upward, and therefore some of this movement is transmitted to the
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`pair 9 of control pistons by means of the roller 12 and the cable pull 14. The pair of control
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`pistons is adjusted in the sense that the new pressure ratios in the working cylinder attempt
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`to reverse the original actuating movement. When the first positive row of pulses is ended
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`1 268 494
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`at time t1, the actuating drive remains idle. Negative pulses occurring in the time interval
`t2- t3 allow the reversible stepper motor to run in such a way that the cable pull is unwound
`from its shaft under the action of the spring 13. This triggers a control process for the
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`compressed air, which process is the opposite of that described above, and therefore causes
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`the working piston 5 to drop and the valve 1 to close.
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`The stepper motor can also be used in actuating drives other than the pneumatic piston
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`drive of the exemplary embodiment. Given a fundamentally identical manner of operation
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`of the entire actuating device in respect of pulse processing, a diaphragm drive can also be
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`provided, which diaphragm drive is controlled, for example, by means of a nozzle/baffle
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`plate system. It is likewise feasible to use a piston drive with hydraulic auxiliary force.
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`Therefore, according to the invention, known, continuously operating actuating drives can
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`be controlled with brief electrical pulses when a reversible stepper motor is incorporated as
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`the electromagnetic component. Actuating drives of this kind are particularly suitable for
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`open-loop and closed-loop control systems which operate in accordance with the pulse-
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`count-modulation method.
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`1 268 494
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`Patent claims
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`1.
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`Actuating device, which is controlled by means of electrical unit pulses, using an
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`actuating drive which is driven by a pressure medium and using an electromechanical
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`5
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`component, which is connected to a control element of the actuating drive, with return of
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`the output actuating stroke of the actuating drive, which return acts on the control element,
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`characterized in that a stepper motor (15) which is known per se and which adjusts the
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`actuating drive by one distance unit with each pulse is provided as the electromechanical
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`component.
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`2.
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`Pulse-controlled actuating device according to Claim 1, characterized in that the
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`actuating drive is designed, in a manner which is known per se, as a piston drive with
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`pneumatic auxiliary force.
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`3.
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`Pulse-controlled actuating device according to Claim 1, characterized in that a
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`diaphragm drive with pneumatic auxiliary force is used as the actuating drive in a manner
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`which is known per se.
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`4.
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`Pulse-controlled actuating device according to Claim 1, characterized in that the
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`actuating drive consists, in a manner which is known per se, of a piston drive with
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`hydraulic auxiliary force.
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`Documents taken into consideration:
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`German Patent Specification No. 1 049 239
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`25
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`1 268 494
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`1 sheet of associated drawings
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`DRAWINGS SHEET 1
`
`Number: 1 268 494
`Int. Cl.: F 15 b
`German Cl.: 60-30
`Publication date: May 16, 1968
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`
`
`
`
`809 549/247
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`

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`Affidavit Attesting to the Accuracy of the Translation
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`Translation of German Published Examined Application No. I 268 494
`From German to English
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`1, Kim Mansukh POPAT BA (Hons!= Dig. Trans. loL,
`translator to RWS Group Ltd, of Eumpa House, Chiltem Park, Chiltern Hill, Chalfont St Peter,
`Buckinghamshire, United Kingdom, declare and certify under penalty of peijury that the attached
`document
`is a true and correct translation of Gennan Published Examined Application No.
`1 268 494 into the English language.
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`Executed on the lst day of August 2017
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`Signature:
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`R. M. PO
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`For and on behalf of RWS Group Ltd
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