Process control device

Claim 2

A process control device, comprising: control operation means wherein process variable and set value are inputted and based upon these inputs, manipulated variable to be applied to process is calculated; data gathering means which gathers said manipulated variable and said process variable for a predetermined period; modeling means including a process model internally, wherein said manipulated variable gathered by said data gathering means is inputted and internal parameters thereof are corrected so that an output of said process model may well match with said process variable; estimation accuracy operating means which calculates accuracy of the process model; and wherein said modeling means is started when changes of said manipulated variable and said process variable become larger than a fixed value and control operation parameters of said control operation means are obtained based upon outputs of said modeling means and estimation accuracy operating means.

Claim 3

The process control device of claim 1, wherein dead time and first order lag coefficient of said process model are calculated based upon the output of said process model and said process variable when gain constant which is one of said internal parameters of said process model, is made 1.

Claim 4

The process control device of claim 1, wherein simplex method is used to adjust each internal parameter of said process model, in which length of component side which composes an initial polygon is made longer than sampling period in said data gathering means.

Claim 5

The process control device of claim 1, wherein simplex method is used to adjust each internal parameter of said process model, in which an initial polygon is remade at least once at the original coordinate when said internal parameters are settled by first simplex method.

Claim 6

A process control device, comprising: control operation means wherein process variable and set value are inputted and based upon these inputs, manipulated variable to be applied to process is calculated; data gathering means which gathers said manipulated variable and said process variable for a predetermined period; step input generating means which applies a step input to said process; first monitoring means which monitors first time width until said process variable changes to a first fixed level; sampling period calculating means, wherein sampling period is made some divided value of said first time width and said process variable is sampled by said data gathering means at said sampling period; second monitoring means which monitors second time width until said process variable changes to a second fixed level higher than said first fixed level; sampling period correcting means which corrects, based upon said first time width and said second time width, sampling period calculated by said sampling period calculating means; modeling means which based upon process data gathered by said data gathering means, calculates control parameters by use of said process model; and wherein at the beginning of control, a step like manipulated process variable is applied to the process by said step input generating means and control operation parameters are calculated by said modeling means based upon time series data at this time.

Claim 7

A process control device, comprising: control operation means wherein process variable and set value are inputted and based upon these inputs, manipulated variable to be applied to process is calculated; data gathering means which gathers said manipulated variable and said process variable for a predetermined period; step input generating means which applies a step input to said process; first monitoring means which monitors first time width until said process variable changes to a first fixed level; sampling period calculating means, wherein sampling period is made some divided value of said first time width and said process variable is sampled by said data gathering means at said sampling period; second monitoring means which monitors second time width until said process variable changes to a second fixed level higher than said first fixed level; sampling period correcting means which corrects, based upon said first time width and said second time width, sampling period calculated by said sampling period calculating means; modeling means which based upon process data gathered by said data gathering means, calculates control parameters by use of said process model; and wherein at the beginning of control, a step like manipulated process variable is applied to the process by said step input generating means and control operation parameters are calculated by said modeling means based upon time series data at this time.

Claim 8

A process control device, comprising: control operation means wherein, at least, proportional(P) operation and integral (I) operation are applied to deviation signal between process variable from process and target control value and an obtained manipulated variable is outputted to said process; data gathering means which gathers said manipulated variable and said process variable for a predetermined period; modeling means including a process model internally, wherein said process variable and said manipulated variable gathered by said data gathering means are inputted and process dynamic characteristic is estimated based upon response waveform thereof; control operation-parameter operating means wherein control operation parameters are calculated based upon estimated result of said process dynamic characteristic obtained by said modeling means and these parameters are set in said control operation means; step input generating means wherein, at automatic control state, a step like signal having a fixed time width is applied to the output of said control operation means according to instruction applied from outside; calculation instruction means wherein said process variable from process and said manipulated variable from said control operation means are inputted and calculation instruction is generated when change of each signal exceeds a predetermined value; and wherein said data gathering means applies gathered data to modeling means in accordance with the calculation instruction from said calculation instruction means and said modeling means and said control operation-parameter operating means are started in accordance with the calculation instruction from said calculation instruction means.

Claim 9

A process control device, comprising: control operation means wherein, at least, proportional(P) operation and integral (I) operation are applied to deviation signal between process variable from process and target control value and an obtained manipulated variable is outputted to said process; data gathering means which gathers said manipulated variable and said process variable for a predetermined period; modeling means including a process model internally, wherein said process variable and said manipulated variable gathered by said data gathering means are inputted and process dynamic characteristic is estimated based upon response waveform thereof; control operation-parameter operating means wherein control operation parameters are calculated based upon estimated result of said process dynamic characteristic obtained by said modeling means and these parameters are set in said control operation means; step input generating means wherein, at automatic control state, a step like signal having a fixed time width is applied to the output of said control operation means according to instruction applied from outside; calculation instruction means wherein said process variable from process and said manipulated variable from said control operation means are inputted and calculation instruction is generated when change of each signal exceeds a predetermined value; and wherein said data gathering means applies gathered data to modeling means in accordance with the calculation instruction from said calculation instruction means and said modeling means and said control operation-parameter operating means are started in accordance with the calculation instruction from said calculation instruction means.

Claim 10

A control device, comprising: control operation means wherein, at least, proportional(P) operation and integral(I) operation are applied to deviation signal between process variable from process and target control value and an obtained manipulated variable is outputted to said process; process model simulating said process to which the output signal of said control operation means is applied, wherein internal parameters are made cahngeable; first band pass filter to which a signal from said process model is applied; second band pass filter having the same characteristic as that of said first band pass filter, to which a signal from said process is applied; calculation instruction means to which a signal from said process and a signal from said second band pass filter are applied, wherein search for parameters by which the difference between signals from said first and second band pass filters are made minimum, is conducted in response to the calculation instruction of said calculation instruction means and the parameters of said process model are made changeable based upon the search result; control operation-parameter operating means which calculates control operation parameters based upon the search result by said process model parameter search means and sets these parameters in said control operation means; and wherein said process model, said first band pass filter, said model parameter search means and control operation-parameter operating means are started in accordance with calculation instruction applied from said calculation instruction means.

Claim 11

A control device, comprising: control operation means wherein, at least, proportional(P) operation and integral(I) operation are applied to deviation signal between process variable from process and target control value and an obtained manipulated variable is outputted to said process; process model simulating said process to which the output signal of said control operation means is applied, wherein internal parameters are made cahngeable; first band pass filter to which a signal from said process model is applied; second band pass filter having the same characteristic as that of said first band pass filter, to which a signal from said process is applied; calculation instruction means to which a signal from said process and a signal from said second band pass filter are applied, wherein search for parameters by which the difference between signals from said first and second band pass filters are made minimum, is conducted in response to the calculation instruction of said calculation instruction means and the parameters of said process model are made changeable based upon the search result; control operation-parameter operating means which calculates control operation parameters based upon the search result by said process model parameter search means and sets these parameters in said control operation means; and wherein said process model, said first band pass filter, said model parameter search means and control operation-parameter operating means are started in accordance with calculation instruction applied from said calculation instruction means.