Control system with filtered dead zone
First Claim
1. A method of operating a control device having a set point value, an error signal, and a control output signal, the error signal representative of a difference between a process variable and the set point value, the control output signal operable to affect the process variable, the method comprising:
- a) generating the control output signal based at least in part on the error signal;
b) filtering the error signal to generate a filtered error signal; and
c) generating the control output signal independent of the error signal when the filtered error signal is within a dead zone.
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Accused Products
Abstract
A method of operating a control device having a setpoint value, an error signal, and a control output is disclosed. The error signal is representative of a difference between a controlled variable and the setpoint value, the control output operable to affect the controlled variable. The method includes generating the control output based at least in part on the error signal and holding the control output at a held value independent of the error signal when the error signal is within a dead zone. The method also includes causing an integrating portion within the control device to track the error signal and the held value when the error signal is within the dead zone.
29 Citations
16 Claims
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1. A method of operating a control device having a set point value, an error signal, and a control output signal, the error signal representative of a difference between a process variable and the set point value, the control output signal operable to affect the process variable, the method comprising:
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a) generating the control output signal based at least in part on the error signal;
b) filtering the error signal to generate a filtered error signal; and
c) generating the control output signal independent of the error signal when the filtered error signal is within a dead zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A control system comprising:
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an actuator having a first input, the actuator operable to effect a process in response to the first input; and
a controller operably coupled to receive a process variable and a set point value, the process variable representative of an output of the process, the controller further operably connected to provide a control output signal to the first input of the actuator, the controller operable to generate the control output signal based at least in part on the error signal;
filter the error signal to generate a filtered error signal;
generate the control output signal independent of the error signal when the filtered error signal is within a dead zone. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification