KR880000862B1 - Temperature control system and method by computer - Google Patents

Abstract

This invention relates to a temperature control system and its process using a computer. The temperatures of several places can be controlled accurately and individually according to the date and the time and also the nonlinear part of the temperature sensor can be measured accurately by the program processing. The computer system (10) is composed of disk-driver (16), CRT displayer (17) and computer (18). The temperature detector(12) is composed of temperature- frequency converter (22), data selection circuit (21), logic circuit (20) and counter (19) etc. The H/C control circuit (13) consists of power amplifier (25) and relay (26).

Description

Computer temperature control system and method

1 is a block diagram of a conventional temperature control system.

2 is a block diagram of a temperature control system according to the present invention.

3 is a flow chart of a temperature control method according to the invention.

Figure 4 is an embodiment of a specific circuit diagram of the temperature detector according to the present invention.

5 (a)-(h) are waveform diagrams of respective parts of FIG.

6 is a detailed circuit diagram of an interface circuit according to the present invention.

* Explanation of symbols for main parts of the drawings

19: counter 20: logic circuit

21: data selection circuit 22: temperature frequency conversion circuit

23: counting pulse generating circuit 24: reference temperature pulse generating circuit

11: Interface Circuit 46: First Decoder

47: second decoder 31, 32: heater or cooler switching circuit

33: data output driver 34: trigger latch circuit

35: place select latch circuit 36, 37, 38: driver

The present invention relates to a temperature control system and method using a computer, and in particular, it is possible to individually control the temperature required in various places according to the time by adding a time control function to various places to control the temperature according to the purpose. System and method thereof.

In the conventional method of controlling temperature using a microcomputer, the analog signal is detected by detecting the temperature of the heating object 5 such as a water bath through the temperature sensor 4 as shown in the block diagram of FIG. Amplified by an amplifier (3) to convert the amplified analog signal into a digital signal with an analog-to-digital converter (2) and then the digital signal is input to the characteristic value of the temperature sensor already built in the microcomputer By comparing and measuring the current temperature, it is determined whether or not to pore the heater (8).

If it is determined that the heater must be operated, the microcomputer 1 outputs the digital output, converts the analog by the digital-analog converter 6, and then drives the power transistor 7 by the analog signal. If the heater 8 is heated by the switching action of the power transistor 7 and the heating target 5 is heated and it is recognized that there is no need for heating, the microcomputer 1 supplies the digital-analog converter 6 to the digital-analog converter 6. The output signal was not transmitted, and the heater 8 was also configured to be inoperative.

Therefore, in the temperature control method using the conventional microcomputer as described above, the digital value of the analog digital converter 2 according to the temperature characteristic of the dummy sensor which is the temperature sensor 4 is calibrated and stored in the microcomputer. There is a software complexity that allows microcomputers to determine and specify the temperature of the microcontroller, as well as the inaccuracy of temperature measurements due to the change in the use of demisters and the inability to simultaneously control the temperature in multiple locations. It is therefore an object of the present invention to provide a system and method capable of temperature control over multiple locations individually over time.

It is still another object of the present invention to provide a system and method for precisely measuring a non-linear portion of a used temperature sensor by a program process and precisely controlling the temperature in a range of temperatures defined according to the measured temperature.

It is yet another object of the present invention to provide a system and method capable of precisely controlling the temperature of multiple locations integrally according to date and time. Hereinafter, the present invention will be described in detail with reference to the drawings. 2 is a block diagram of a system according to the present invention, and FIG. 3 is a flowchart showing a temperature control method of a temperature control system according to the present invention.

In FIG. 2, the part consisting of the disk driver 16, the CRT display 17, and the computer 18 is the computer system 10. The temperature frequency conversion circuit 22, the data selection circuit 21, and the logic circuit 20 are shown in FIG. ), The reference temperature pulse generating circuit 24, the counting pulse generating circuit 23 and the counter 19 are the temperature detector 12, and the circuit composed of the power amplifier 25 and the relay 26 is a heater or The cooler (hereinafter referred to as H / C) control circuit 13 is a temperature control part composed of a cold temperature device 27 consisting of a heater and a cooler and a temperature sensor 28 for sensing a temperature at a place where the cold temperature device is installed. Is a portion provided at a place where the digital clock circuit 30 and the driver circuit 29, which are conventional digital clocks, are the digital clock unit 15, and 11 is an interface circuit.

Therefore, in order to drive a system for simultaneously controlling the temperatures of various places according to the present invention, first, data as a subprogram must be stored in the storage device of the computer 18. The data as a subprogram is the type of H / C to be temperature controlled, the date, place, time range, temperature range, and temperature control that are file names. For example, as shown in Table 1 below, data of temperature control according to the date is prepared.

TABLE 1

As shown in Table 1, place 1 does not control the temperature on August 5, 1985, and place 2 controls the temperature of 21-25 ° C from 0 to 12:35, and from 12:36 to 17:56. Date control, temperature control of 12-15 ℃, etc. Temperature control according to temperature, temperature, temperature, temperature, etc. Save it to (16).

In addition, the control program controls the entire control of the temperature control system according to the present invention in accordance with the data set by the subprogram in the manner of the flowchart of FIG.

First, when the computer is switched on and starts at the level P1 in FIG. 3, the control program according to the flowchart in FIG. 3 is stored in the memory of the computer 18. If the control start date is input to the computer 18 as in P2, the procedure P3 As described above, all data of the subprograms such as H / C type, temperature and time set for each place of the date, such as Table 1, are inputted and stored by the disk driver 16 into the computer 18. The computer 18 then inputs and stores the current time from the digital clock 30 of the digital clock unit 15 of FIG. 2 through the driver circuit 29 and the interface circuit 11 as in the procedure P4.

If the current time entered is smaller than the time of the stored date input by the sub-program as in procedure P5 (for example, if the date is changed), the next day data is inputted according to procedure P16 and the changed data is P3, P4, P5. Repeat and otherwise proceed to procedure P6.

In step P6, the computer finds the input stored date and data, and in step P7, the computer 18 outputs the current temperature detected by the temperature sensor 28 installed in the places to control the temperature in the number of pulses. The outputs of the temperature detector 12 are inputted through the interface circuit 11, and the number of the input pulses is converted into temperature by the following linearization formula built into the computer by the procedure P8 and then by the procedure P9. Prepare to compare the data from the first location for temperature control.

Then, the computer 18 finds the data of the predetermined place to which the current time input and stored by the procedure P4 belongs in the procedure P10, and the time when the current temperature converted by the procedure P8 by the procedure P11 finds the procedure P10. A comparison is made to determine whether it is within the temperature range of the storm data.

If it is not within the above temperature range, the procedure of determining whether the H / C on / off state is converted and stored as shown in step P12 and comparing the data of all the places for temperature control by step P13 is compared.

If not, that is, in the above temperature range, the procedure P12 does not proceed but proceeds to the above-described procedure P13.

If all the places for temperature control have not been read in step P13, the data of all the places for temperature control are read and the step P15 is performed by preparing the comparison of the data of the next place in step P14, and then proceeding to step P10. The result determined by the procedure, that is, the date and temperature control place and H / C type, current time and current temperature of each place, H / C type to be output, current time and current temperature of each place, output The on / off status of the H / Cs to be displayed is displayed on the CRT display and the heater or cooler control signal is output to the H / C control circuit 13 through the interface circuit 11 of FIG. It will continue to control the temperature according to the date and time to control.

Therefore, the present invention inputs and stores the data of the date to be temperature controlled and the current time, determines whether the date has changed, finds the first step of finding the date to be controlled, and finds the data of the date to be controlled, and displays the current temperature. According to the number of pulses, the second step of converting and storing the data of the first place and preparing to compare the first location data are found, and the temperature of the range of time to which the current time of the first step belongs is determined. Determining whether the heater or cooler is on or off by determining whether it is within the temperature range, and determining the on / off status of the heater or cooler until all data of all the locations are read. When reading, the heater or cooler is controlled according to the on / off state of the heater or cooler determined and stored in the third step, and the CRT display And a fourth step of outputting the result and continuing each of the above steps.

FIG. 4 is a specific circuit diagram of the temperature detector 12 and the temperature sensor 28 according to the present invention of FIG. 2, which is an embodiment in the case where 16 temperature control locations are assumed.

In the figure, the temperature sensor 28 is a dummyster Th1-Th16 and is installed for temperature detection at each location RO _1- Ro ₁₆ , and the temperature frequency conversion circuit 22 includes a timer 51-66 and a capacitor ( C ₁ -C _{20. The} data selection circuit 21 is composed of a multiplexer 69. The reference temperature pulse generating circuit 24 includes a timer 67 and a resistor R ₂ and a capacitor C _21- . C ₂₂ , the counting pulse generator circuit 23 is composed of resistors R ₃ , R _4, and capacitors C _23- C ₂₅ , and the logic circuit 20 is composed of inverters INV2, AND gates A1 and A2, and triggers. The generating circuit 14 is composed of a resistor R ₁ , a capacitor C _26, and an inverter INV ₁ , and the counter 19 is composed of a conventional binary counter integrated circuit 70.

On the other hand, S ₁ -S ₄ are the place selection input terminals, and Q ₀ -Q ₇ are the counter 19 output terminals. Vd is a power supply voltage input terminal, and EN is an enable signal input terminal output from the interface circuit 11 described later.

On the other hand, Fig. 5 (a)-Fig. 5 (h) are diagrams showing the operating waveforms at the points 4 (a) and 4 (h) of the parts of Fig. 4, respectively.

Hereinafter, an operation relationship of the temperature detector 12 of FIG. 4 will be described in detail with reference to the waveform diagrams of FIGS. 5A to 5H.

When the enable signal as shown in FIG. 5 (a) is input to the input terminal EN, the differential waveform is output by the differential circuit composed of the capacitor C ₂₆ and the resistor R ₁ of the trigger generation circuit 14 and inverted by the inverter INV1. The trigger signal as shown in FIG. 5 (b) triggers the monostable multivibrator composed of the timers 51-66 and the resistor R ₂ , the capacitor C _21, and the timer 67.

Therefore, the monostable multivibrator composed of the reference temperature pulse generating circuit 24, the resistor R ₂ , the capacitor C _21, and the timer 67 uses the values of the resistors R ₂ and the capacitor C ₂₁ as constant values so that the reference temperature (e.g. 0 ° C) the on-time is 1.1R ₂ C _{21 It} will be constant to maintain the on-time of a certain time, such as the fifth (c).

On the other hand, the data selection circuit 21 outputs the inverted output of any one of the times 51-66 in response to the change of the logic signal of the place selection signals S ₁ -S ₄ , which are input signals of the multiplexer 69. Will produce output. For example, if the input signals of S ₁ , S ₂ , S ₃ , and S ₄ are "0" (place Ro1), the inverted output of the timer 51 is the output terminal w of the multiplexer 69 to the timer 51. ) Is outputted as shown in FIG. 5 (d).

At this time, the low time becomes equal to the time of 1.1RTh1C ₁ , which is an on time corresponding to the resistance temperature RTh1 according to the temperature of the dummyster Th1 and the current temperature of the place RO1 determined by the capacitor C ₁ .

On the other hand, the counting pulse generating circuit 23 is an unstable multivibrator composed of resistors R ₃ , R ₄ , capacitors C ₂₃ -C _25, and a timer 68, and a reference temperature pulse at 0 ° C. and a maximum temperature at a place to be controlled. (E.g., 60 deg. C), a pulse is generated that divides the time interval of the pulse corresponding to the difference of the pulses output at the time (51-66) by 255 equals (because it is 8 bits), and the timer (68) as shown in FIG. Will be output to the output terminal.

Therefore, the waveform of FIG. 5 (d) which is the output signal of the multiplexer 69 and the waveform of FIG. 5 (c) which is the output of the timer 67 which are the output of the reference temperature pulse generating circuit 24 are the AND gates A1. ), The waveform is outputted as the fifth (e) degree, and when the waveform is inputted to the AND gate A2 as the waveform of the fifth (f) degree, the waveform as the fifth (g) degree is outputted. Input to the binary counter 70.

On the other hand, if the waveform of FIG. 5 (d) passes through invert INV2, the waveform of FIG. 5 (h) is inputted to the clear terminal of the binary counter 70 and then dropped from "high" to "low". 70 counts the number of pulses of the waveform of FIG. 5 (g) and outputs it to the output terminals Q ₀ -Q ₇ .

Therefore, by this pulse number, the computer calculates the present temperature of the location RO1 as follows. In other words, the dummyster has nonlinearity outside of a certain range between temperature and resistance. Therefore, even in this empty linear part, it is possible to make an accurate temperature measurement by linearizing using a built-in function (natural logarithm) in a computer.

The characteristic curve of the dummyster becomes as follows.

Where R ₀ is the resistance by the reference temperature, B is the proportional constant, T ₀ is the reference absolute temperature, and T is the absolute measurement temperature. Here, assuming that the reference temperature is 25 ℃, the resistance at this time 10 ⁴ Ω, the proportional constant is 4360 can be written as follows.

Solving Formula (2) with respect to T gives the following formula.

Since the temperature control range of the temperature control system according to the present invention is 0 ° C. to 60 ° C. and 8 bits are used, the resistance value difference of the dummyster at the temperature is divided by 255.

Therefore, the resistance value in the range of 0 ° C to 60 ° C is as follows.

R = 38180-141.3n... … … … … (5)

Where n is the number of pulses

Therefore, the temperature T becomes as follows by Formula (3) and Formula (5).

Therefore, by counting the pulse number n by equation (6), the temperature T can be calculated using the built-in function (natural log 1n) in the computer.

6 is a specific circuit diagram of the interface circuit 11 when the computer 18 according to the present invention is used as an Apple computer. 6 shows a first decoder 46, which is a binary-decoded decoder that inputs a signal of a chip selector (or device selector) and a read or write signal (R / W) and outputs a signal to any one output terminal. The second decoder 47, the first decoder 46, and the second decoder, which are binary coded decimal decoders for inputting an address signal A ₀ -A ₂ and outputting a signal to either output terminal. The output signal of the OA gate 39-45 and the output signal of the OA gate 39-45 which have outputted the output signal to any one by inputting the output of 47 are used as control signals, and the input data signal from the computer is controlled by H / C. The first H / C switching circuit 31 and the second H / C switching circuit 32 of the D polyflop and latched to the circuit 13 are controlled by the control signals which are output signals of the oragate 42. Trigger latch circuit 34 and computer 18 for outputting a latch signal that triggers timers 51-67 with enable EN. The position selection data output from the place selection latch circuit 35 and the output signal of the ora gate 41 are inputted to the place selection input terminals S ₁ -S ₄ of the temperature detector 12. Of the data output driver 33 and the oragate 43-45 for inputting the number of pulses corresponding to the current temperature of the predetermined place counted from (12) to the computer via the data lines D ₀ -D ₇ . Driver circuits 36-38 are inputted to the data lines D ₀ -D ₇ by inputting the current time and minute signals of the digital clock unit 15 composed of a normal digital clock according to the output signal. .

Eight slots are provided in the peripheral connector of a conventional Apple computer I / O, and the present invention uses slot 3, and the data lines D ₀ -D _{7 of} FIG. 6 are slots 3, respectively. The read and write lines (R / W), the chip selector lines (CS) and the address lines (A _0- A ₂ ) are connected to the data terminal pins of the read and write pins, the chip selector pins and the addresses of the slot 3, respectively. Is connected to the pin.

Therefore, the chip selector line CS becomes a low state (hereinafter referred to as "0" state) as a signal indicating that the slot 3 is in use, and the read and write lines (R / W) when data is read and written by the computer. ) Become the "1" state and the "0" state, respectively.

Meanwhile, addresses used in respective parts of the temperature control system according to the present invention are shown in Table 2 below.

TABLE 2

For example, if the chip selector line CS is "0", the read and write lines (R / W) are "1", and the address line A ₂ A ₁ A ₀ = 000, the output of the first decoder in FIG. Only the output terminal 0 of the terminal 1 and the second decoder is in the "0" state, and all the remaining output terminals are in the "1" state, so only the output of the oragate 45 is in the "0" state and the remaining oragate 39 -44 are all in the " 1 " state so that only the driver circuit 38 is operated and the remaining H / C switching circuits 31 and 32, the data output driver 33, the trigger latch circuit 34, and the place select latch circuit (35) and driver circuits 36 and 37 are both cleared. Therefore, as shown in Table 2, only data corresponding to the portion of the digital clock unit 15 is input to the computer 18 through the driver circuit 38 to the data lines D ₀ -D ₇ .

In addition, if the chip selector line CS is "0", the read and write lines R / W are "0", and the address A ₂ A ₁ A ₀ = 011, the first decoder of FIG. Only output terminal (0) of "0" state, only output terminal (3) of the second decoder becomes "0" state, and all other output terminals output "1" state, so only the oragate 42 outputs The state is " 0 ", and the outputs of all the remaining orifices 39-41 and 43-45 are in the " 1 "

Therefore, since only the trigger latch circuit 34 and the place select latch circuit 35 are operated, the output of the trigger latch circuit 34 is outputted by the pulse output from the computer 18 so that the waveform shown in FIG. (12) is input to the enable input terminal EN, the place selection latch circuit 35 inputs the place selection data signal output from the computer through the data line (D ₀ -D ₃ ) and the temperature detection section 12 of the The place selection data signal is input to S ₁ -S ₄ in FIG. ₄ as a place selection input terminal.

As described above, the interface circuits of FIG. 6 operate according to the use contents corresponding to the remaining signals of A ₂ A ₁ A ₀ in Table 2.

Therefore, the interface circuit of FIG. 6 inputs an address signal and a read and write signal output from a computer and outputs a signal to any one of the output terminals. The first and second decoders 46 and 47 and the first and second decoders output the signal. O / G 39-45 for inputting the output of the second decoder and outputting the signal to one of the commands according to the address signal, and H / C control circuit 13 and the temperature detector 12 by the OA gate signal. ) And H / C switching circuits 31 and 32 used as control signals for latching and driving the output data of the computer 18 to the digital clock unit 15 or for latching and driving the data to the computer 18. ), The data output driver 33, the trigger latch circuit 34, the place select latch circuit 35, and the driver circuits 36-38.

In the case of using the interface circuit of FIG. 6, the H / C control circuit 13 is connected to each output terminal of the H / C switching circuits 31 and 32 (for each 16 places) and the temperature detector 12 The power amplifier 25 for power amplifying the signal of the operation command state of the heater or cooler to be operated is determined by the comparison of the current temperature of each place and the set temperature by the sub-program and the cold temperature device by the amplified signal ( 27 is a circuit composed of a relay 26 for operating.

The digital clock section of FIG. 2 is composed of a normal digital clock digital clock 30 and a normal driver circuit 29 for connecting to the interface circuit 11.

Therefore, the present invention can individually control or easily change the required temperature for various places according to time zones, and can automatically control for a long time by preparing a data file, and maximize the error due to linearization of the temperature sensor using a computer built-in function. Temperature can be controlled remotely by applying the communication system to the computer's input / output peripheral connector.In the case of district heating using waste heat, it is possible to measure the heat consumption of each remote place, and to supply variable heat. There is an advantage that can also be used for control devices.

When the present invention described above is applied to an apparatus that maintains only a constant temperature regardless of time, such as an incubator, the digital clock portion of FIG. 2 is excluded and the procedures P2, P3, P4, P5, P16, and P10 are excluded from the flowchart of FIG. In the case where the present invention is applied to a device for turning on and off the heating device only in accordance with time, steps P7, P8, and P11 in the flowchart of FIG. You can take the excluded procedure.

Claims (4)

In the temperature control system using a computer, the power amplification is input by inputting the interface circuit 11 for receiving data and control signals with the computer and the temperature control type command signals from all the places to be temperature controlled from the interface circuit 11. The power amplifier 25 and the relay 26 to operate the relay by the amplified power and the cold and warm device 27 installed in each place where the heater or cooler is operated by the operation of the relay senses the temperature of the place The trigger generation circuit 14 and the temperature sensor 28 for converting the enable signal output from the heater or cooler control circuit 13 and the interface circuit 11 composed of a temperature sensor 28 to a trigger signal A temperature-frequency conversion circuit 22 and the temperature for inputting an analog signal of the sensed temperature and the trigger signal to convert into a pulse corresponding to the analog signal; Input the output of the frequency conversion circuit 22 and the data selection circuit 21 and the trigger signal for outputting the pulse of the place to be controlled by inputting the location selection data from the computer 18 through the interface circuit 11. The count pulse generating circuit 23, the data selection circuit 21, the reference temperature pulse generating circuit 24 and the counting pulse generating circuit 23 generating a pulse to be counted by the reference temperature pulse generating circuit 24 which generates a pulse set at a constant temperature. A logic circuit 20 for inputting the output of the counting pulse generating circuit 23 to output a pulse corresponding to the current temperature of the place to be miscontrolled, a counter 19 for counting the number of pulses, and a digital clock. And a driver circuit (29) for driving the clock (30) and the current time of the digital clock (30) to the interface circuit (11). The first and second decoders 46 and 47 of claim 1, wherein the interface circuit 11 inputs an address signal output from a computer and a read and write signal and outputs a signal to either output terminal. And an output of the first and second decoders to output one of the signals by the command according to the address signal, and the output signal of the oragate to input predetermined data or commands. And a driver or latch circuit (31-38) for inputting or outputting the heater or the cooler control circuit (13) or the digital clock unit (15) or the temperature detector (12). 2. The temperature frequency converting circuit 22 and the reference temperature pulse generating circuit 24 are constituted by a monostable multivibrator, and the counting pulse generating circuit 23 is constituted by a pulse generator for generating a predetermined counting pulse. Computer temperature control system characterized in that. In a temperature control method using a computer, a first step of finding and storing a date to be controlled by inputting and storing data of a date to be temperature controlled and a current time, and determining whether the date has changed and data of the date to be controlled. Find and convert the current temperature according to the number of pulses, and find the data of the range of time to which the current time of the first step and the second step of preparing to compare and compare the first place data, and convert in the second step Determine whether the stored temperature is within a predetermined temperature range of the data, and determine whether the heater or cooler is turned on or off, and determine whether the heater or cooler is turned on or off until the data of all the places is read. After reading the data of step 3 and all places, the heater or cooler may be removed according to the on / off status of the heater or cooler determined in step 3. And outputting a predetermined result to the CRT display, the method characterized by made of an a fourth step of repeating the steps of the still.

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