Control stabilizing techniques

Claim 3

The method of claim 1 wherein said step of determining a difference comprises the step of comparing the actual operation of said device with said predetermined standard of performance.

Claim 6

The method of claim 3 wherein said step of modifying comprises the step of subtracting an attenuated time delayed representation of said indication from said indication.

Claim 7

The method of claim 4 wherein said step of subtracting comprises the steps of: attenuating said indication; inverting said attenuated indication; adding a time delay to said inverted indication; and algebraically combining said inverted time delayed indication and said indication.

Claim 10

A control system for regulating the operation of a device in accordance with a desired standard of performance, comprising; error detecting means for providing an error signal when the operation of said device deviates from said desired standard of performance; proportional mode operating means for producing a first signal proportional to said error signal; reset mode operating means for producing a second signal proportional to the integral of said error signal; inverse time delay means coupled to said reset mode operating means for producing a third signal proportional to the inverse of said second signal and having a time delay with respect to said second signal; and combining means coupled to said proportional mode operating means, said reset mode operating means and said inverse time delay means for combining said first, second and third signals to generate a control signal adapted to be applied to said device such that the operation of said device tends to conform to said desired standard of performance, thereby minimizing said error signal.

Claim 11

A control system for regulating the operation of a device in accordance with a desired standard of performance, comprising; error detecting means for providing an error signal when the operation of said device deviates from said desired standard of performance; proportional mode operating means for producing a first signal proportional to said error signal; reset mode operating means for producing a second signal proportional to the integral of said error signal; inverse time delay means coupled to said reset mode operating means for producing a third signal proportional to the inverse of said second signal and having a time delay with respect to said second signal; and combining means coupled to said proportional mode operating means, said reset mode operating means and said inverse time delay means for combining said first, second and third signals to generate a control signal adapted to be applied to said device such that the operation of said device tends to conform to said desired standard of performance, thereby minimizing said error signal.

Claim 12

A control system in accordance with claim 7 wherein said inverse time delay means comprises; negative gain amplifying means having an amplification factor less than unity; and lag circuit means connected to said negative gain amplifying means for applying a time delay to the signal applied thereto by said negative gain amplifying means.

Claim 13

A control system in accordance with claim 8 wherein said lag circuit means includes adjustable means for adjusting the time delay applied thereby and said reset mode operating means includes corresponding adjustable means; said respective adjustable means being adapted for simultaneous adjustment thereof.

Claim 14

A control system in accordance with claim 8 wherein said negative gain amplifying means includes gain adjust means for adjusting said amplification factor to a desired value.

Claim 15

In combination with a process control system for regulating the performance of a process, said process control system including amplifying means and integrating means responsive to an error signal characterizing the performance of said process, apparatus for reducing performance fluctuations about a desired standard of performance caused by the operation of said reset means, comprising: inverse time delay means connected to said integrating means for inverting and time delaying the signal produced by said integrating means; and means for adding the signal produced by said inverse time delay means to the signals produced by said amplifying means and said integrating means, respectively, to generate a control signal adapted to regulate the performance of said process.

Claim 16

In combination with a process control system for regulating the performance of a process, said process control system including amplifying means and integrating means responsive to an error signal characterizing the performance of said process, apparatus for reducing performance fluctuations about a desired standard of performance caused by the operation of said reset means, comprising: inverse time delay means connected to said integrating means for inverting and time delaying the signal produced by said integrating means; and means for adding the signal produced by said inverse time delay means to the signals produced by said amplifying means and said integrating means, respectively, to generate a control signal adapted to regulate the performance of said process.

Claim 17

The combination of claim 11 wherein said inverse time delay means comprises: negative gain amplifying means connected to said integrating means, said negative gain amplifying means having an amplification factor less than unity; and time delay means connected to said negative gain amplifying means for adding a time delay to the signal produced by said negative gain amplifying means.

Claim 18

Apparatus for reducing fluctuations in the transient response of a control system including a proportional mode operating component and a reset mode operating component, comprising: lag means coupled to said reset mode operating component for adding a time delay to the signal produced by said reset mode operating component and for inverting the delayed signal; and combining means coupled to said proportional mode operating component, said reset mode operating component and said lag means for algebraically combining the signals produced by each of said components and the signal produced by said lag means.

Claim 19

Apparatus for reducing fluctuations in the transient response of a control system including a proportional mode operating component and a reset mode operating component, comprising: lag means coupled to said reset mode operating component for adding a time delay to the signal produced by said reset mode operating component and for inverting the delayed signal; and combining means coupled to said proportional mode operating component, said reset mode operating component and said lag means for algebraically combining the signals produced by each of said components and the signal produced by said lag means.