Pneumatic controller
First Claim
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1. A pneumatic controller having automatic switching of its time behavior as a function of a control pressure, said controller comprising:
- pneumatic controller means having an output for providing a control pressure in response to a controlled variable, said pneumatic controller means having a feedback input;
pneumatic integrator means connected to said feedback input and having an integrator input for establishing an integrating feedback path between said integrator input and said feedback input; and
,relay means connected to said pneumatic controller means output, to said integrator input and to atmosphere for normally connecting said integrator input to said pneumatic controller means output and for connecting said integrator input to atmosphere when said control pressure attains an upper limit.
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Abstract
A pneumatic controller is disclosed having an automatic switching of its time behavior as a function of the control pressure by means of a relay being arranged in the integrating feedback path and being actuated by the control pressure. According to the invention, the relay connects the integrating feedback path to the atmospheric pressure when the control pressure attains an upper limit and/or to the supply pressure when the control pressure attains a lower limit.
4 Citations
8 Claims
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1. A pneumatic controller having automatic switching of its time behavior as a function of a control pressure, said controller comprising:
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pneumatic controller means having an output for providing a control pressure in response to a controlled variable, said pneumatic controller means having a feedback input; pneumatic integrator means connected to said feedback input and having an integrator input for establishing an integrating feedback path between said integrator input and said feedback input; and
,relay means connected to said pneumatic controller means output, to said integrator input and to atmosphere for normally connecting said integrator input to said pneumatic controller means output and for connecting said integrator input to atmosphere when said control pressure attains an upper limit. - View Dependent Claims (2)
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3. A pneumatic controller having automatic switching of its time behavior as a function of a control pressure, said controller comprising:
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pneumatic controller means havng an output for providing a control pressure in response to a controlled variable, said pneumatic controller means having a feedback input; pneumatic integrator means connected to said feedback input and having an inegrator input for establishing an integrating feedback path between said integrator input and said feedback input; and
,relay means connected to said pneumatic controller means output, to said integrator input, and to a supply pressure for normally connecting said integrator input to said penumatic controller means output and for connecting said integrator input to said supply pressure when said control pressure attains a lower limit. - View Dependent Claims (4)
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5. A pneumatic controller having automatic switching of its time behavior as a function of a control pressure, said controller comprising:
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pneumatic controller means having an output for providing a control pressure in response to a controlled variable, said pneumatic controller means having a feedback input; pneumatic integrator means connected to said feedback input and having an integrator input for establishing an integrating feedback path between said integrator input and said feedback input; and
,relay means connected to said integrator input, to said pneumatic controller means output, to atmosphere and to a supply pressure for normally connecting said pneumatic controller means output to said integrator input, to connect said integrator input to atmosphere when said control pressure attains an upper limit, and to connect said integrator input to supply pressure when said control pressure attains a lower limit. - View Dependent Claims (6, 7, 8)
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Specification