JPS58130925A - Controller for temperature of air conditioner - Google Patents

Abstract

PURPOSE:To raise the accuracy of controlling and prevent the occurrence of hunting phenomenon by controlling a flow control valve according to the variations in the differences between air conditioning temperatures for every fixed time and a set temperature for an air conditioner having a reheater branched thrugh the flow control valve between a compressor and a condenser. CONSTITUTION:Air conditioning temperatures detected by temperature sensors 14a-14c are put in a temperature controller 15, where the average value of the detected temperatures is calculated and the difference beteen the detected temperatures and the set temperature is calculated for every a fixed time and stored. In this way, the variation rate of temperature differences is calculated from the temperature difference for every a fixed time and the stored temperature diffeences. By combining the temperature differences and the variation rates, the opening degree of a flow control valve 6 is increased when the variation rate is below -0.5 deg.C and the average temperature is 0.5 deg.C or more lower than the set value, for example, and inthe converse case, the valve 6 is closed. In this way, the flow control valve is controlled by the difference and its variation rate between average present temperature and the set temperature, and thereby hunting is prevented and control accuracy ic raised.

Description

Detailed Description of the Invention This invention installs an evaporator and a reheater in parallel, and the reheater has a Mc
Connected via lfi moderation valve, reheated with condensation heat of reheater,
Reheat control is achieved by controlling the valve opening of the ThgRJ valve. ! 1lii? This invention relates to a temperature control device for an air conditioner that controls m degrees.

Traditionally, the most common imitation of this pole was the one shown in the first example.

In the figure, (1) is the compressor, (2) is the condenser, (3) is the first expansion device, (4) is the evaporator, (5) is the three-way pipe, and (6) is the evaporator.
) is the flow m control valve, (7) is the reheater, (8) is the second expansion device, (9) is the three-way pipe, αq is the air conditioning temperature thorn detection device, (b)
The flow jl! is maintained at a predetermined temperature based on the input from the air conditioning temperature detection device 111cLQ. (2) is the blower, and (2) is the casing of the unit.

Note that (1) and (2) are usually housed in a casing and packaged.

Next, the operation will be explained. When the current control valve (6) is fully closed, that is, when the reheating torque is 0, the refrigerant flows through the compressor (1),
Three-way valve (5), lk condenser 2), first expansion device (3),
It flows through the three-way pipe (9), the evaporator (4), and the compressor +17, forming a normal refrigerant cycle for air conditioning.

i! 11111 When a valve opening command is issued to the current control valve (6) from the 11111 installation (b), the discharged refrigerant gas from the compression To (t>) is partially flowed through the three-way valve (5) to adjust the current control valve. Valve (6
) and reheat! (7), where it is reheated by condensation heat, and after being put down in the second place (8), the three-way valve (9)
), it joins the refrigerant from the condenser (2) No. 111 (J).On the air side, as shown by the arrow in Figure 1, the evaporator (
After being cooled in step 4), it is sucked in by an air blower and heated in a bed heater (7).
It is sent out to the factory, reheated, and then blown out from the unit. The control of the flow 1kh control valve (6) is fitted with air temperature detection.
li (continuous i-temperature is detected from itl and control I
It is input to A & (b), the difference in the air ai degree membrane setting value is calculated by & (b) in the control, and the garden valve 8at command commensurate with the difference is continuously output to the J1wIa control valve. It is done by. The Tongfu flow bulk melting flat valve (6) is of an electromagnetic type, and the voltage supplied to the wLa coil varies depending on the voltage supplied to the wLa coil, so the control device 1 outputs a voltage corresponding to the voltage supplied to the wLa coil.

Conventionally, this pole device has been constructed in one diagram as described above, and has had the following drawbacks.

Since the valve opening command is based only on the difference between the current air conditioning temperature and the set air temperature, the valve opening command is quickly followed by a change in this difference. In other words, since it is not possible to distinguish between sudden changes and simple changes in the air speed, there is a drawback that the response becomes slow or too fast. In addition, since the air conditioning temperature is continuously detected and valve opening commands are issued continuously, unnecessary hunting phenomenon occurs. Furthermore, the reheating speed could not be determined because a fixed value command (absolute value command) was issued due to the difference between the air temperature and the air temperature setting. In other words, the high and low pressure of this air-conditioning appliance changes depending on the air conditioning temperature and the temperature of the heat source at that time, so even the slightest opening of the valve will change the amount of heat flowing through it.

In addition, even with the same valve-towing command, the valve opening degree was not constant due to variations in the product of the current control valve itself.

Furthermore, the air temperature distribution is either at a single point at the unit outlet or immediately after exiting the blower, and the air flow is often uneven, making it difficult to detect an accurate representative temperature. There was also a drawback.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the air conditioning temperature is detected by using the average value of the inputs of several 4L units installed at the air outlet.
Based on the difference between the air temperature and the air conditioner set temperature, and the rate of change of that difference, the air temperature can be changed by issuing a command to the flow control valve to change the displacement from the current valve opening at regular intervals. To provide a temperature control device for an air-conditioning electrical manufacturing device that is accurate even for high and low pressures and does not cause unnecessary hunting phenomenon that is not affected by changes in current caused by variations in high and low pressures or product variations in bulk control valves. It is an object.

An embodiment of the present invention will be described below with reference to FIG.

In Th2 fusion (14a), (14b), (14
c) is a temperature-sensing element that detects the air conditioning temperature, and the chest is a temperature control device according to an embodiment of the present invention, and the other components are the first embodiment.
- It is opposite to the conventional device of -. Figure 8 shows the temperature control device (
2) is an internal block diagram, and a. is a temperature sensing element (14 m
).

Convert the inputs of (14b) and (14c) into electrical signals,
An input conversion device that outputs an average value. Cao is an air conditioning temperature setting device.

(g) is a timer device that outputs a pulse every time a short time elapses; (2) is the output of one wheel of the input conversion device and the idle aMdm degree setting device (b) in synchronization with the output of timer device 1□□□ There is a memory unit that stores the output of the comparison device wt West, which calculates the difference between the current air conditioning temperature and the air conditioning temperature set value. (2)
calculates the difference between the current air temperature and the theoretical temperature setting value using the data stored in the memory device and the output of the comparator Q field, and calculates the carp conversion rate of the difference, and by the combination of these, the change in valve temperature is calculated. A computing unit that outputs commands at regular intervals. The hook is arithmetic unit (
(b) Command 1 and Output III which controls the control valve (6).

Next, one operation of an embodiment of the present invention will be explained with reference to a forty-first flowchart.

Vacant air detected by temperature sensing elements (14a), (14b), (14c)! l temperature Ta+ * Ti2B, Ta
s (m a) in Figure 4 is the average value' at the input conversion device cw
Becomes Tam (b). Empty-fM degree setting device ah outputs the set @ value Ts (CJ. If no pulse output is output from the timer device f1t [phase], the comparator will not move (d)
Return to the start again. When a pulse is output from the timer device oa after a certain period of drunkenness, the comparator most is driven 1 and Tam
and Ts. That is, ΔT=Tam-Ts is calculated (e). The comparison device (6) outputs the data of ΔT to the storage device 1gJ and the arithmetic device (2). When the new data of △T is input, the storage device tw stores it and stores it as △T(
Current)) Previously stored data (ΔT, (@tgJ
)) is output to the arithmetic unit @. Arithmetic unit & (2) ΔT
(current) and ΔT (once) and calculate the rate of change of ΔT. For example, if ΔT<-0.5deg and the current Tam is Ts
If the temperature is 0.5 deg or more lower than that, a routine is entered to change the valve opening in the direction of (f-+g), and if the rate of change of △T, that is, the temperature decreases, is greater than the previous time, the valve is opened. degree 25 step open (g-+h), if the drop is smaller than 11, the valve opening degree I Step-(g-+i
) is issued to the output control device 11■.

On the contrary, △T ) +0.5 deg and the current Tam is Ts
If it is 0.5 degrees or more higher than the previous one, set the valve opening to the same direction as the closing direction. If the temperature rises more than the previous time, close the valve 8 degrees 25 tep (l→m) if-
If the rise is smaller than that, the valve opening is 15tep (1-
On) output control device! Send to @. -0,5d
eg4ΔT S +0.5 deg and current Tam and T
When the difference in s is small, no command to change the valve opening is issued and the process returns to the start. In other words, a dead zone is provided. The output control device @, which receives the command for the amount of change in the valve, changes the output commensurate with the amount of change, for example, adjusts the voltage value to a certain J1 degree and outputs it to the flow control valve (6). And after the output voltage changes, hold it until the next command comes, and then apply! 1li1 section valve (
6) Keep the valve level constant. The valve opening seen here also depends on changes in the high and low pressure of the cold wax cycle at that time, and the flow rate.
Th control valve (The flow rate differs due to variations in valve train products, etc., but in the implementation of this invention, the command for the valve opening is changed by changing the valve opening depending on the change and rate of change in the air conditioning temperature. Since it issues a relative command to give a certain amount, even if the current is different, the air conditioning temperature is accurately controlled around the air conditioning set temperature. In addition, since a change command is issued to the running time section, the flow rate valve (6) does not hunt.

In addition, the above implementation machine has an input conversion device, a temperature setting device,
The timer device, comparator device, storage device, and arithmetic device have been described in numbered formats, but if a microcombination unit is used, these can be processed as software and the circuit configuration can be simplified.

As described above, according to the present invention, since the detection of steady temperature is based on the average of multiple false power supply elements, even if the air temperature distribution is poor, the representative temperature can be detected from 1 to 1, and the air conditioning temperature By commanding the flow control valve to change its position from the current valve at regular intervals based on the difference between the current temperature and the stoichiometric set temperature and the rate of change of that difference, it is possible to accurately control changes in air conditioning temperature. ,
Therefore, it is not affected by changes in low pressure or travel changes caused by product variations in the smooth IB valve train, and the unavoidable hunting phenomenon of the general-purpose JK control valve does not occur, and the accuracy can be harmonized at once. There is an effect that it can be done.

[Brief explanation of the drawing]

The first block shows a conventional air conditioner that controls reheating from condensed heat. FIG. 2 is a block diagram showing one embodiment of the present invention. No. 8- is a block diagram showing an example of the temperature control device shown in No. 2. FIG. 4 is a flowchart illustrating the operation of the temperature control device shown in FIG. 8. In the above, (14a), (14b), and (14c) are temperature sensing elements, 輔 is an input conversion device, aη is an air conditioning temperature setting device, (to) is a timer device, a9 is a comparison device, (e) is a storage device, The hook is an arithmetic device, and (2) is an output control device. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent MJ Surprise Shin - Figure 1 Figure 2 Σ X 2 Figure 4 To

Claims (2)

[Claims] (1) An evaporator and a reheater are installed side by side, and this reheater is a compressor and a condenser! /& Air conditioning temperature detection system that connects to the bypass circuit separated from the air conditioner via a flow valve and detects whether the air temperature is good in an air system that controls reheating using the condensed heat of the reheater. A temperature control device that arbitrarily sets the air conditioning temperature; a comparison device that receives the outputs of the temperature detection device and the temperature control device as input, and outputs the difference between the air temperature and the air-set temperature; The output of the memory generator that stores the output and past data, and the output of the timer device are input, and the difference between the air conditioning temperature and the set temperature of the air conditioner and the rate of change of this difference are calculated every time, and the combination is calculated. A calculation device that issues a command to increase the valve 8 degrees according to the output of the calculation device, and the flow ili! A temperature control device for an air conditioner, which has a wrinkle in the control for controlling the valve opening of an i-section valve. (2) The temperature control device for air temperature control according to claim 1, wherein the nitrogen temperature detection device outputs an average value of a plurality of temperature sensing elements.