Patent ID: 9183827
Filing Date: 2015-11-10
Classification: G05B,G10K

Abstract:
1. A PID controller for receiving an analog input signal containing at least an indication of a parameter in a plant to be controlled to generate an analog output signal for control of the parameter, wherein said analog input signal contains a fed back component resulting from said analog output signal, the PID controller comprising: an analog input for receiving the analog input signal and an analog output for outputting the analog output signal; a proportional unit connected between said analog input and output, said proportional unit including a first control unit for adjusting the gain of said proportional unit, the first control unit comprising: a first analog filter having an adjustable gain; first gain adjusting unit for adjusting the gain of said first analog filter; and a first feedback filter for compensating for a fed back component in a first analog input signal; an integral unit connected between said analog input and output, said integral unit including a second control unit for adjusting the gain of said integral unit, the second control unit comprising: a second analog filter having an adjustable gain; second gain adjusting unit for adjusting the gain of said second analog filter; and a second feedback filter for compensating for a fed back component in a second analog input signal; a differential unit connected between said analog input and output, said differential unit including a third control unit for adjusting the gain of said differential unit, the third control unit comprising: a third analog filter having an adjustable gain; third gain adjusting unit for adjusting the gain of said third analog filter; and a third feedback filter for compensating for a fed back component in a third analog input signal; and a summing unit for summing the outputs of said proportional unit, said integral unit, and said differential unit to generate said analog output of said PID controller; wherein each of said first, second and third gain adjustment units are adapted to determine a gain adjustment using a feed forward adjustment method, said feed forward adjustment method being a digital feed forward adjustment method including the step of digitally processing the respective analog input signal using a model of the plant, and wherein each of said first, second and third feedback filters are configured to filter using a model of at least a phase response of a feedback path of said analog output signal to said respective analog input signal.