초록 ▼

A process controller controls an integrating-type process based on a measured process variable and a set point. The process controller includes an error generating circuit, a non-integrating control circuit and an adaptive bias circuit. The error generating circuit generates an error signal based on

A process controller controls an integrating-type process based on a measured process variable and a set point. The process controller includes an error generating circuit, a non-integrating control circuit and an adaptive bias circuit. The error generating circuit generates an error signal based on a difference between the set point and the measured process variable. The control circuit generates a control signal as a function of the error signal. The adaptive bias circuit adds a bias value to the control signal, the measured process variable or the set point. The bias value is selectively updated as a function of the error signal to force the error signal toward zero.

대표청구항 ▼

[ What is claimed is:] [11.] A process control apparatus for controlling an integrating-type process based on a measured process variable and a set point, comprising:a first summing circuit having a process variable input for receiving the measured process variable, a set point input for receiving t

[ What is claimed is:] [11.] A process control apparatus for controlling an integrating-type process based on a measured process variable and a set point, comprising:a first summing circuit having a process variable input for receiving the measured process variable, a set point input for receiving the set point, and an error output, wherein the fist summing circuit generates an error signal on the error output based on a difference between the process set point and the measured variable;a non-integrating control circuit having an input coupled to the error output and having a first control output, wherein the control circuit generates a first control signal on the first control output in response to the error signal;a second summing circuit having a control input, a bias input and a second control output, wherein the control input is coupled to the first control output and the second summing circuit generates a second control signal on the second control output based on a sum of the first control signal and a bias signal which is applied to the bias input;a bias feedback circuit selectively coupled between the second control output and the bias input; anda bias control circuit coupled to the bias feedback circuit and the error output, which selectively couples the second control signal to the bias input based on the error signal.