Method and apparatus for the control and regulation of a first magnitude of a device by action on a second magnitude

Claim 1

A method for the control of a magnitude x between two values, x m and x M , by action on a control magnitude y with which said magnitude x is in a one-to-one relationship when a parameter h, to which the magnitude x is sensitive remains constant, wherein said magnitude y varies between two values y m and y M causing said magnitude x to vary from x m to x M when the parameter h has a reference value h i , said magnitude x is a one-to-one function of the parameter h, for each control value x p the parameter h varies in a determined interval h m to h M , including said reference value h i , and for each value of x p (h) a function y p =g p (h) is defined where y p is a value given to said magnitude y to obtain the value x p when said parameter has a value of h, a second function g' p (h) can be determined from different values of g p (h), with h being a value in said interval h m to h M , from a value of a first function g p (h) for the same value of the parameter h, by addition of a function of the difference between the real measured value h r of the parameter h and the reference value h i ; said method comprising, representing said magnitude x by the output magnitude of a first operational amplifier having first and second inputs, applying to said first input a voltage U i representing control magnitude y i to obtain said output magnitude having a value x i when said parameter h has a reference value h i , varying said voltage U i from U m to U M when x varies from x m to x M , applying to said second input a voltage V c which represents the output magnitude corrected by a sensor of the parameter h, wherein said corrected voltage V c is substantially equal to 0 when h=h i and substantially equal to H.sub.(hr-hi) when h≠h i , and applying a correction to said control magnitude U i to obtain a control value x i when the parameter h goes from said reference value h i to a measured value h r , wherein said correction is represented by function H.sub.(hr-hi).

Claim 2

A method for the control of a magnitude x between two values, x m and x M , by action on a control magnitude y with which said magnitude x is in a one-to-one relationship when a parameter h, to which the magnitude x is sensitive remains constant, wherein said magnitude y varies between two values y m and y M causing said magnitude x to vary from x m to x M when the parameter h has a reference value h i , said magnitude x is a one-to-one function of the parameter h, for each control value x p the parameter h varies in a determined interval h m to h M , including said reference value h i , and for each value of x p (h) a function y p =g p (h) is defined where y p is a value given to said magnitude y to obtain the value x p when said parameter has a value of h, a second function g' p (h) can be determined from different values of g p (h), with h being a value in said interval h m to h M , from a value of a first function g p (h) for the same value of the parameter h, by addition of a function of the difference between the real measured value h r of the parameter h and the reference value h i ; said method comprising, representing said magnitude x by the output magnitude of a first operational amplifier having first and second inputs, applying to said first input a voltage U i representing control magnitude y i to obtain said output magnitude having a value x i when said parameter h has a reference value h i , varying said voltage U i from U m to U M when x varies from x m to x M , applying to said second input a voltage V c which represents the output magnitude corrected by a sensor of the parameter h, wherein said corrected voltage V c is substantially equal to 0 when h=h i and substantially equal to H.sub.(hr-hi) when h≠h i , and applying a correction to said control magnitude U i to obtain a control value x i when the parameter h goes from said reference value h i to a measured value h r , wherein said correction is represented by function H.sub.(hr-hi).

Claim 8

A device for the control of a magnitude x between two values, x m and x M , by action on a control magnitude y with which said magnitude x is in a one-to-one relationship when a parameter h, to which said magnitude x is sensitive, remain constant, wherein said magnitude y varies between two values y m and y M to make said magnitude x m vary from x m to x m when the parameter h has a reference value h i , said magnitude x is a one-to-one function of said parameter h for each control value x p , the parameter h varying in a predetermined interval h m to h M , including reference value h i , so that, for each value x p (h) of said magnitude x, a function y p =g p (h) is defined, wherein y p is a value given to said magnitude y to obtain the value x p when said parameter has a value of h, a second function g p (h) can be determined by the different functions g p (h) with h being any value in said interval h m to h M , from a value of a first function g p (h) for the same value of the parameter h, and the addition of a known term as a function of the difference between the real measured value h r of the parameter h and the reference value h i ; said device comprising a first operational amplifier having first and second inputs and an output representative of said magnitude x, a control circuit for applying a voltage U i to said first input wherein, said voltage U i represents a control magnitude y i to obtain said output magnitude with a value x i when parameter h has a reference value of h i , and said voltage U i varying from U m to U M when x i varies from x m to x M , a sensor of parameter h, and a correction means for correcting the output of said sensor and outputting a voltage V c to said second input of operational amplifier, the corrected voltage V c is substantially equal to 0 when h=h i and substantially equal to H.sub.(hr-hi) when h≠h i , and the value of the correction to be applied to the control magnitude U i to obtain the controlled value x i when the parameter h goes from the reference value h i to the measured value h r is represented by H.sub.(hr-hi).

Claim 9

A device for the control of a magnitude x between two values, x m and x M , by action on a control magnitude y with which said magnitude x is in a one-to-one relationship when a parameter h, to which said magnitude x is sensitive, remain constant, wherein said magnitude y varies between two values y m and y M to make said magnitude x m vary from x m to x m when the parameter h has a reference value h i , said magnitude x is a one-to-one function of said parameter h for each control value x p , the parameter h varying in a predetermined interval h m to h M , including reference value h i , so that, for each value x p (h) of said magnitude x, a function y p =g p (h) is defined, wherein y p is a value given to said magnitude y to obtain the value x p when said parameter has a value of h, a second function g p (h) can be determined by the different functions g p (h) with h being any value in said interval h m to h M , from a value of a first function g p (h) for the same value of the parameter h, and the addition of a known term as a function of the difference between the real measured value h r of the parameter h and the reference value h i ; said device comprising a first operational amplifier having first and second inputs and an output representative of said magnitude x, a control circuit for applying a voltage U i to said first input wherein, said voltage U i represents a control magnitude y i to obtain said output magnitude with a value x i when parameter h has a reference value of h i , and said voltage U i varying from U m to U M when x i varies from x m to x M , a sensor of parameter h, and a correction means for correcting the output of said sensor and outputting a voltage V c to said second input of operational amplifier, the corrected voltage V c is substantially equal to 0 when h=h i and substantially equal to H.sub.(hr-hi) when h≠h i , and the value of the correction to be applied to the control magnitude U i to obtain the controlled value x i when the parameter h goes from the reference value h i to the measured value h r is represented by H.sub.(hr-hi).

Claim 18

An apparatus for the control and regulation of a first magnitude of a device by action of a second magnitude, comprising said first magnitude having a one-to-one relationship with said second magnitude when a parameter of the device remains constant, said second magnitude varies between two values which causes said first magnitude to vary between two values when said parameter is a reference value, said first magnitude is a one-to-one function of said parameter, said parameter varies in an interval which includes the reference value, a first operational amplifier having first and second inputs, a control circuit connected to said first input of said operational amplifier for supplying a control voltage, a sensor to sense said parameter, a correction means for correcting said parameter having a plurality of inputs and an output, a first input connected to said sensor for receiving said parameter and a second input connected to said control circuit for receiving a command word, the output of said correction means being connected to said second input of said first operational amplifier for supplying a corrected voltage.

Claim 19

An apparatus for the control and regulation of a first magnitude of a device by action of a second magnitude, comprising said first magnitude having a one-to-one relationship with said second magnitude when a parameter of the device remains constant, said second magnitude varies between two values which causes said first magnitude to vary between two values when said parameter is a reference value, said first magnitude is a one-to-one function of said parameter, said parameter varies in an interval which includes the reference value, a first operational amplifier having first and second inputs, a control circuit connected to said first input of said operational amplifier for supplying a control voltage, a sensor to sense said parameter, a correction means for correcting said parameter having a plurality of inputs and an output, a first input connected to said sensor for receiving said parameter and a second input connected to said control circuit for receiving a command word, the output of said correction means being connected to said second input of said first operational amplifier for supplying a corrected voltage.