Process control with unreliable communications
First Claim
1. A method of controlling a process with a control signal, the method comprising the steps of:
- implementing iterations of a control routine to generate the control signal;
when an indication of a response to the control signal is unavailable, maintaining a feedback contribution to the control signal over one or more of the iterations of the control routine; and
modifying the feedback contribution upon receiving the response indication;
wherein the modifying step comprises determining the feedback contribution in accordance with an elapsed time between the received response indication and a previous communication of the response indication.
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Accused Products
Abstract
Disclosed are methods and devices for controlling a process with a control signal. Iterations of a control routine are implemented to generate the control signal, and when an indication of a response to the control signal is unavailable, a feedback contribution to the control signal is maintained over one or more of the iterations of the control routine. The feedback contribution is then modified upon receiving the response indication, in which the feedback contribution is determined in accordance with an elapsed time between the received response indication and a previous communication of the response indication.
19 Citations
25 Claims
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1. A method of controlling a process with a control signal, the method comprising the steps of:
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implementing iterations of a control routine to generate the control signal;
when an indication of a response to the control signal is unavailable, maintaining a feedback contribution to the control signal over one or more of the iterations of the control routine; and
modifying the feedback contribution upon receiving the response indication;
wherein the modifying step comprises determining the feedback contribution in accordance with an elapsed time between the received response indication and a previous communication of the response indication. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A device for controlling a process with a control signal, the device comprising:
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a processor;
a communication interface to receive an indication of a response to the control signal; and
,a computer-readable medium in which a control routine is stored for execution by the processor to generate the control signal;
wherein the control module is configured to;
determine a contribution to the control signal based on the response indication;
maintain the control signal contribution over one or more iterations of the control routine when the response indication is not received by the communication interface; and
,update the control signal contribution based on an elapsed time between updates of the response indication. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification