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Pressure control system

  • US 4,583,566 A
  • Filed: 08/16/1983
  • Issued: 04/22/1986
  • Est. Priority Date: 08/16/1983
  • Status: Expired due to Term
First Claim
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1. In a pressure control system for regulating the actual fluid pressure in fluid-filled apparatus such as pneumatic devices and the like in accordance with an adjustable desired fluid pressure, wherein the system comprises a source of compressed fluid, means for selecting the desired fluid pressure, valve means connected to the apparatus and selectively connectable to the source of compressed fluid for selectively increasing, decreasing and maintaining the fluid pressure in the apparatus, and control means responsive to the actual fluid pressure and the selection of desired fluid pressure to operate the valve means in accordance with the difference between the actual and desired fluid pressure, the improvement wherein the control means comprises:

  • transducer means connected to the apparatus and responsive to the actual fluid pressure to generate an electrical transducer signal continuously proportional to the magnitude of the actual fluid pressure;

    first circuit means connected to the means for selecting the desired fluid pressure and to the transducer means, and responsive to the transducer signal for generating electrical valve control signals representative of the polarity of the difference between the desired fluid pressure and the actual fluid pressure;

    the valve means is responsive to the electrical valve control signal to continuously and selectively increase or decrease the actual fluid pressure in the apparatus until the actual fluid pressure is within a predetermined range of the desired fluid pressure; and

    the first circuit means comprises proportional signal generating means connected to the transducer means and to the means for selecting the desired fluid pressure, and responsive to the transducer signal and the particular selected desired fluid pressure for generating a first difference signal having a value continuously proportional to the magnitude and polarity of the difference between the actual fluid pressure and the desired fluid pressure during increase and decrease of the actual air pressure.

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