Automatic PID controller in which the ratio of the control target value to the control signal is used to optimize performance

A method for performing a proportional-integral control of a device, comprising the steps of:

• a) calculating a ratio of a target value of a control signal of a control apparatus to the control signal;
• b) multiplying the ratio by an operating signal of the device;
• c) providing the result of the multiplying to the device as the operating signal;
• and
• d) controlling the device using proportional-integral control based on the ratio value.

An apparatus for supplying an operating signal to a target apparatus having a positive characteristic that makes a control signal which is controlled by the operating signal and is output from the target apparatus equal to a target signal, comprising:

• a) a first controller receiving the target signal x.sub.s, a present operating signal y(n), and a present control signal x(n), and calculating ##EQU2## b) a parameter setting device setting a differential parameter kd of a proportional-integral-derivative control operation based on a deviation between the target value and the present control signal;
• c) a second controller receiving the target signal x.sub.s, the present control signal x(n), and the differential parameter kd, and calculating ##EQU3## where
• .DELTA.x.sub.s (n)=x.sub.s (n)-x.sub.x (n-1)
• .DELTA.x(n)=x(n)-x(n-1);
• and
• d) an adder adding together the results of calculation by said first controller and said second controller, wherein the result of addition the adding is supplied to the target apparatus as a next operating signal y(n+1).

An apparatus for supplying an operating signal to a target apparatus having a positive characteristic that makes a control signal which is controlled by the operating signal and is output from the target apparatus equal to a target signal, comprising:

• a) a processor calculating a deviation S.sub.x between a doubled target signal 2x.sub.s and a present control signal x(n);
• b) a first controller receiving the deviation X.sub.S, a present operating signal y(n), and a present control signal x(n), and calculating ##EQU4## c) a parameter setting device setting a differential parameter kd of a proportional-integral-derivative control operation based on a deviation between the target value and the present control signal;
• d) a second controller receiving the deviation X.sub.s, the present control signal x(n), and the differential parameter kd, and ##EQU5## calculating where
• .DELTA.x.sub.s (n)=x.sub.s (n)-x.sub.s (n-1)
• .DELTA.x.sub.s (n)=x.sub.s (n)-x.sub.s (n-1);
• and
• e) an adder adding together the results of calculation by said first controller and said second controller, wherein the result of the adding is supplied to the target apparatus as a next operating signal y(n+1), whereby the apparatus controls the next operating signal y(n+1) based on the ratio of said deviation X.sub.s to the present control signal x(n) multiplied by the present operating signal y(n).

An apparatus for supplying an operating signal to a target apparatus having a negative characteristic that makes a control signal which is controlled by the operating signal and is output from the target apparatus equal to a target signal, comprising:

• a) a first controller receiving the target signal x.sub.s, a present operating signal y(n), and a present control signal x(n), and calculating ##EQU6## b) a parameter setting device setting a differential parameter kd of a proportional-integral-derivative control operation based on a deviation between the target value and the present control signal;
• c) a second controller receiving the target signal x.sub.s, the present control signal x(n), and the differential parameter kd, and calculating ##EQU7## where
• .DELTA.x.sub.s (n)=x.sub.s (n)-x.sub.s (n-1)
• .DELTA.x(n)=x(n)-x(n-1);
• and
• d) an adder adding together the results of calculation by said first controller and said second controller, wherein the result of the adding is supplied to the target apparatus as a next operating signal y(n+1), whereby the apparatus controls the next operating signal y(n+1) based on the ratio of the present control signal to said target signal x.sub.s multiplied by the present operating signal y(n).

An apparatus for supplying an operating signal to a target apparatus having a negative characteristic that makes a control signal which is controlled by the operating signal and is output from the target apparatus equal to a target signal, comprising:

• a) a processor calculating a deviation X.sub.s between a doubled target signal 2 and a present control signal x(n);
• b) a first controller receiving the deviation X.sub.s, a present operating signal y(n), and a present control signal x(n), and calculating ##EQU8## c) a parameter setting device setting a differential parameter kd of a proportional-integral-derivative control operation based on a deviation between the target value and the present control signal;
• d) a second controller receiving the deviation X.sub.s9 the present control signal x(n), and the differential parameter kd, and calculating ##EQU9## where
• .DELTA.x.sub.s (n)=x.sub.s (n)-x.sub.s (n-1)
• .DELTA.x(n)=x(n)-x(n-1);
• and
• e) an adder adding together the results of calculation by said first controller and said second controller, wherein the result of the adding is supplied to the target apparatus as a next operating signal y(n+1), whereby the apparatus controls the next operating signal y(n+1) based on the ratio of the present control signal x(n) to said deviation X.sub.s multiplied by the present operating signal y(n).