KR830002733B1 - Digital Control Process - Google Patents

Abstract

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Description

Digital Control Process

1 is an explanatory diagram showing a relationship between a measurement mode period and a control mode period.

2 is a block diagram of an embodiment according to the present invention.

3 is a principle diagram of the operation during the measurement mode period by the control system of the present invention.

4 is a principle diagram of an operation during a control mode cycle by the control system of the present invention.

5 is a block diagram of a second embodiment in which a ROM serving as a table memory is provided on an input side of a control system.

6 is a principle diagram for the operation during the control mode period of the second embodiment.

7 is a block diagram of a third embodiment of the present invention.

8 is a flowchart showing a process of writing and storing a ROM during the measurement mode cycle of the control system according to the present estrus.

9 is a partial block diagram of the control circuit shown in FIG. 2, FIG. 3, FIG. 5, and FIG.

10 is a timing diagram for the operation of the control circuit according to the present invention.

Reproduction of high quality printed images from primary color photographs or pictures depends on color separation. The picture of the primary color separated through the blue, green, and red filters is a kind of treatment process that separates cyan, magent, yellow, and deep color, respectively. In order to reproduce the printed image, a process of masking, that is, adjusting a difference between the primary colors and the printing ink type is also performed. In the case of color separation by an optical camera, which is a conventional method, a scanner converts the lightest and darkest areas of the primary colors into electrical signals to separate and mask colors, and to adjust the contrast of colors. Also adjust the magnification. Although the original image is recorded by modulating the amount of light from a light source such as a laser or an incandescent lamp, the modulation characteristic of this amount of light is generally nonlinear.

Similarly, even with a laser, the amount of light changes with time is inevitable.

Until now, the analog feedback control system operated continuously was used. However, this system has the same drawbacks as temperature drift inherent in analog systems, which makes it impossible to control high-speed proxying because the time delay depends on the modulation characteristics of the light source.

The main object of the present invention is to provide a digital control process that enables linear alignment of the nonlinear characteristics of the modulator and eliminates other pedans caused by fluctuations over time, such as temperature trips.

It is still another object of the present invention to provide a digital control processing step for generalizing a control function in addition to a linear arrangement of nonlinear characteristics by freely making input / output characteristics of the entire control system into predetermined characteristics.

In order to linearize the operation of the equipment, it is necessary to fix the change over time of the control object such as drift, so that the output value and the set value (input to the control system) of the control object are the same level without being concerned with the specification of the object. It would be convenient if you could control it with

The main point of the present invention is to use RAM as the inverse function table memory, and the input and output of the whole control system take the blanking time according to the measurement time during the operation of the equipment and measure the input-output characteristics of the control object during the period. This measurement input is written and stored as data of RAM, and the measurement output is written and stored as address of RAM and maintained at the same level by using the control mode period following the measurement mode period as the inverse function table memory. When the cycles of the measurement mode cycle and the control mode cycle are set appropriately for the object to be controlled, variations in the object's time such as characteristic drift can be fixed. By satisfying the table memory functioning as a predetermined function on the input side of the control system according to the present invention, the input-output characteristic can be any predetermined talk and thus the control function is generalized.

In the control by the inverse function table memory provided by the digital control system of the present invention as described above, since the fixed data of the object is determined during the blanking time, stable characteristics are obtained and high-speed operation is possible, and furthermore, modulation characteristics are predetermined. There is an advantage that can be changed to characteristics.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 1 and 2, 101 and 103 select the B contact during the measurement mode period (M) and the A point during the control mode period (S), respectively. The RAM 102 reads and writes data β and address α in pairs through the control circuit 107.

The D / A converter 104 is driven by the digital signal α, and the control object 105 is driven by the analog signal χ. The A / D converter 106 converts the analog output Y of the control object 105 into a digital output y.

The control system according to the present invention is configured to perform a control operation during the measurement mode period M and the control mode period S. Igagal describes the control principle and operation during two kinds of mode cycles as follows.

Measurement Mode Period (M)

출력 특성에 따라서, 디지탈 측정입력(χ)과 A/D변환기(106)에 의해 변환된 제어대상(105)의 디지탈 출력(y)과의 관계는 다음의 방정식(1)으로 표시할 수 있다.During the measurement mode period M, the selectors 101 and 103 select the B defects shown in FIG. 2, respectively, so that the circuit configuration can be displayed as in FIG. The digital measurement input χ output from the control circuit 107 is applied to the D / A converter 104 and then applied to the object 105 to be controlled as the analog signal χ to generate the analog output Y. The analog output Y is then converted into a digital signal y by the A / D converter 106 and transmitted to the control circuit 107. Mouth of target to be controlled

According to the output characteristic, the relationship between the digital measurement input χ and the digital output y of the control object 105 converted by the A / D converter 106 can be expressed by the following equation (1).

y = f (χ) ‥‥‥ (1)

The input? Passed through the control circuit 107 is now written to the address? Of the RAM 102 as data?. If the address α is equal to the output signal y, the following relational expression is established between the address α and the data β of the RAM 102.

a = f (β) ‥‥‥ (2)

Therefore, when the data β is called as the table memory at the address α of the RAM 102, the following equation appears.

β = f- ¹ (α) ‥‥‥ (3)

In conclusion, we get the following inverse function:

χ = f ^-1 (y) ‥‥‥ (4)

The operation of the circuit 107 during the calculation of the inverse function and the measurement mode period M is as follows.

In FIG. 3, the input χ to the object to be controlled is given to the digital measurement input χ through the D / A converter 104, and the output Y of this object 105 is the A / D converter ( Via 106 is applied to the control circuit 107 as a digital signal y. Thus, the digital measurement input χ and the digital signal y are both represented as some integer. The value of digital measurement input (χ)

χ = χ _z χ ₁ , χ ₂ ‥‥‥‥ χ _N (5)

(χ _{n + 1} = χ _{n + 1} )

ego. The digital signal value (y) for each digital measurement input value (χ)

y = y ₀ , y ₁ , y ₂ , ‥‥‥‥ y _N (6)

On the other hand, the operation of the control circuit 107 shown in FIG. 9 proceeds as follows.

1) If the value of χ, for example χ _0, is set in the χ-counter 115 and applied to the object 105 to be controlled via the D / A converter 104, then the value of y, for example y ₀ = f (χ ₀ ) obtained by the A / D converter 106 and set in the y register 112. This operation is shown in FIG. 5, where the start of the measurement mode is 21 and the step of obtaining the signal y after giving the output χ is 22.

2) The data χ ₀ is written into the β register 114, and the value is taken as β. β is β = χ (23) in FIG.

3) The value y is written from the y register 112 into the α counter 113, and the value is taken as a = y (24) in FIG.

4) By counting a counter 113 from a to a + c, the value of β is written into an address from a to a + c in RAM 102 (where c is a constant that is an integer).

This is shown in FIG. 8 by i = (25), a> a _maχ (amount, a _maχ is the maximum value of RAM address) 26, yes (27), no (28), address a and data ( denoted at each step as written (29), i = i + 1 (30), a = a + 1 (31), i = c (32), yes (33) and no (34). .

5) The χ value changes to (χ + 1), returning to the operation of 1) above. This is indicated by the steps χ = χ + 1 (35), χ> χ _N (36) and no (37) in FIG.

6) When the χ value exceeds the final value χ _N. The operation to write to the RAM 102 is stopped. This is indicated by the steps of no 38 and measurement mode interruption 39 in FIG.

In the above operation 4), preventing χ is the value (y) when a incremented by one to χ + 1 is not increased necessarily by 1 to y _{n + 1} from the y _n, the same data does not written into any address To be written to one or more addresses.

(c) is set appropriately for the control system. If the storage capacity of the RAM 102 is exceeded after the address is completed counting, the electrolytic writing operation is not performed. The processing described above is shown in a flowchart in FIG.

The block diagrams for the control circuits 107 of FIG. 2 and FIG. 3 are as shown in FIG.

Control Mode Cycle (S)

During the control mode period S, the selectors 101 and 103 select the contact A in the circuit of FIG. 2, so that the configuration is shown as FIG. The address of the RAM 102 is obtained by the digital input ω (omega) ω for this control system and this data is given as the output χ and the analog output χ is given by the D, A converter 104 to control it. Is applied to the object 105, and thus an output Y is obtained, and the digital output y is given by the A / D converter 106. Thus, the above-described equation (3), i.e., β = f-1 ( From a) we get

χ = f-1 (ω)

From the above equation (1), the relational expression between the input ω for the control system and the digital output y of the controlled object 105 is given by the following equation.

y = f (χ)

therefore,

y = f {f ^-1 (ω)}, y = ω

Therefore, the input ω to the control system keeps the same level as the digital output y of the object 105 to be controlled in all cases.

출력특성에 관계없이 모든 경우에 있어서 대상(105)의 디지탈출력(y)이 이 제어시스템의 입력(ω)과 동일 하게 유지되는 동작에 있다.As can be seen from the above description, the characteristics of the control system according to the present invention are determined by the input of the object 105 to be controlled.

In all cases irrespective of the output characteristics, the digital output y of the object 105 is in operation to remain the same as the input ω of this control system.

Control circuit (107)

9, clock pulses from the clock pulse generating circuit 110 are sent to the timing circuit 111. As shown in FIG. From this circuit 111, the operation pulses are χ-counter 115, a-counter 113, A / D converter 106, y-register 11, β-register 114, and RAM. Is applied to 102. The timing diagram for this is shown in FIG. 10, where measurement mode 40, χ-counter 41, A / D converter start pulse 42, y-register 43, and β register 44 ), a counter 45, and memory write pulse 46 are operated respectively. a in the counter 45. Each period 47 is represented by y ₀ , y ₀ +1,... y ₀ + c; y ₁ , y ₁ +1... y ₁ + c; y _N , y _N +1... y _N + c is displayed. In other words, a pulse is applied to the χ-counter even if the count increases by one every period P. After A second has passed from the generation of the pulse, the operation pulse of the A / D conversion circuit is applied, and after B seconds has passed from the operation pulse, the write pulse is applied to the y-register 11 and the β-register 114. At this time, if the operation is performed with the timing A + B = P, since the input signal x is delayed by the period P from the output signal y, the write operation and the measurement are performed at the same time. The operation written in the RAM 102 is migrated by the pulse in the period P. As shown in FIG. During the period c ', no write operation is performed because the value of the address alpha exceeds the maximum capacity.

출력 특성을 측정하고, 그 데이터를 RAM에 기억시키며, 제어모우드 동안에 역함수 테이블 메모리로 RAM을 활용함으로써, 비선형 입

출력특성을 지닌 제어대상이 선형배열을 통해 고속제어를 받게 된다는 점이다.As mentioned above, the characteristics of the control system according to the present invention are determined during the measurement mode.

By measuring output characteristics, storing the data in RAM, and utilizing RAM as the inverse table memory during the control mode,

The control object with the output characteristics is subjected to high speed control through the linear arrangement.

The second embodiment shown in FIG. 5 and FIG. 6 is described as follows. In these figures, a ROM serving as a table memory is provided on the input side of the control system. In the ROM 108, data having a predetermined perfume is written. Therefore, any predetermined function can be freely set by utilizing this as a table memory. In other words, the ROM 108 gives a freely set function value g (ω) corresponding to the input 10.

Since the selectors 101 and 103 select the B contact during the measurement mode period M, the control principle and operation in this embodiment are the same as those described in the first embodiment, and the circuit configuration is shown in FIG. It becomes. During the control mode period S, the selectors 101 and 103 select a contact, so that the circuit configuration is as shown in FIG. The digital input ω of this control system is given as the output g (ω) g (ω) of the ROM 108 set as a predetermined function. By output, the address of the RAM 102 is specified. The data is given as output χ. Data (χ) is applied to the control object 105 as an analog output (χ) by the D / A converter 104, an output (Y) is generated, and the digital output (y) by the A / D converter (106). Is converted to. From equation (3), i.e., β = f ^-1 (a), the following equation can be obtained.

χ = f ^-1 (g (ω))

Since y = f (χ) in equation (1), the relationship between the digital input of the control system ω and the digital output of the control object 105 is expressed as follows.

y = f ^-1 {f ^-1 (g (ω))} = g (ω)

Therefore, the digital input? To the control system and the digital output of the control object 105 can be set in a certain specific relationship by the table memory ROM 108 serving as an arbitrary function.

출력 특성에 관계 없이 전체 제어시스템의 입

출력 특성을 소정의 특성으로 자유로이 만드는 것이 가능해 진다.As described above, the entry of the control target by the control system of the present invention.

Input of the whole control system regardless of the output characteristics

It is possible to freely make the output characteristic a predetermined characteristic.

출력특성을 다른 특성으로 자유로이 변화시키는 것도 가능 하다.When the ROM is replaced, the entire control system

It is also possible to freely change the output characteristics to other characteristics.

출력을 비례관계로 유지시키는 것이 가능하다. 따라서, 본 발명에 의한 제어기능은 보다 일반화되고 또 유용하게 된다.By providing the amplifier in the feedback circuit of the control target output to the control system by the control system according to the present invention as shown in FIG.

It is possible to keep the output proportional. Therefore, the control function according to the present invention becomes more general and useful.

Claims (1)

In a digital control processing process having a measurement mode and a control mode, during a measurement mode, a digital measurement signal is input to a control object, and written into RAM as data at a memory address corresponding to the digital output signal measured from the control object. During the control mode, the digital control signal related to the predetermined output signal of the control target is written into the RAM as an address, the data related to the address is read out, and the data is controlled so that the predetermined output signal is obtained so that the control target can be controlled. Digital control process migrated to the supply stage.

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