Method and apparatus for regulating fluid flow
AssigneeGeorg Fischer Aktiengesellschaft
InventorRobert Steinemann
Life of this patent
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Abstract
A method for regulating the flow volume of a fluid medium and apparatus therefor wherein the actual value of the flow volume of the fluid medium is measured and an analogous signal is generated representing the actual value. A signal representing a desired value of flow volume is also generated and is compared with the actual value signal with the analogous differential signal being applied as an electrical control signal consisting of individual pulse signals having a frequency proportional to the value of the analogous differential signal. The control signal is amplified and applied to control either the pressure or the rate of flow of the fluid medium.
Claims10
A method for regulating the flow and/or the pressure of a fluid medium comprising the steps of measuring the actual value of the flow volume or the pressure of said fluid medium, generating an analogous signal representative of said actual value and a signal representative of a desired value, comparing said actual value signal and said desired value signal and generating from said comparison an analogous differential signal, generating electrical control signals comprising two parallel analogous signals derived from said analogous differential signal, reversing one of said signals, applying said control signals as individual pulse signals having a frequency proportional to the value of said analogous differential signal, amplifying said control signals and applying said amplified control signals to control one of the pressure and rate of flow of said fluid medium.
Apparatus for regulating the flow and/or the pressure of a fluid medium comprising actual value transmitter means for generating a signal representative of the actual value of the flow volume or the pressure to be controlled, a desired value transmitter for generating a signal representative of a desired value of the flow volume or the pressure of said flow medium, a comparator for comparing said actual value signal and said desired value signal and for generating an analogous differential signal therefrom, a regulator for receiving said analogous differential value signal and for generating a control signal, means for reversing said control signal, amplifier means for receiving and amplifying only control signals of one given polarity, and a regulating unit connected with said amplifier receiving said amplified control signal to control the flow or the pressure of said fluid medium, with at least one signal line with a voltage-to-frequency converter and a pulse shaper being arranged between said regulator and said amplifier means.
Dependencies are inferred from the claim text.