JPH0474624B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention detects the ambient temperature with a temperature detection element and controls the load for heating or cooling by comparing the detected temperature with a preset temperature. related to air conditioners.

[Technical Background of the Invention] Air conditioners include various types of stoves such as kerosene stoves, gas stoves, and electric stoves, coolers, and air conditioners. For example, the kerosene stove shown in FIG. 5 is conventionally known. .

This uses a one-chip microcomputer 1 having an AD (analog-to-digital) conversion function as a control base, and the computer 1 is connected to the +V _C power supply. In addition, a series circuit of a constant voltage diode 2 and a resistor 3 is connected to the +V _C power supply, and a series circuit of a set temperature changeover switch 4 and a resistor 5 is connected to the connection point of the diode 2 and resistor 3.
The reference voltage V _REF for AD conversion is obtained. In addition, a thermistor 6 for room temperature detection, which is a temperature detection element, is connected between the +V _C terminal and the connection point between the diode 2 and the resistor 3.
and a series circuit of resistor 7 are connected. The connection point between the thermistor 6 and the resistor 7 is connected to the input terminal _I2 of the microcomputer 1, and a room temperature detection signal is input thereto. The input terminal _I2 performs AD conversion on the input signal. The connection point between the changeover switch 4 and the resistor 5 is connected to the input terminal _I1 of the microcomputer 1.
A set temperature switching signal is input to this input terminal _I1 by operating the changeover switch 4. The microcomputer 1 has a built-in timer register _S0 , and sets numerical values according to inputs to the input terminals _I1 and _I2 . Then, the contents of the register _S0 are decremented by one for each oscillation period of the time signal generated by the internal reference clock, and a signal of "1" is sent to the output terminal T only in the last period when the contents become zero. It is outputting. The microcomputer 1 drives and controls the electromagnetic pump 8, which is a load, based on the drive pulse output from the output terminal T, and determines the amount of kerosene to be supplied to the burner.

Therefore, the drive pulse waveform output from the output terminal T becomes as shown in FIG. Here, Tt is the oscillation period of the time signal of the microcomputer 1, and Ex is a numerical value set in the register _S0 . Since the electromagnetic pump 8 operated by this drive pulse changes the amount of kerosene supplied at the cycle of the pulse, the amount of kerosene supplied can be changed by changing the numerical value Ex set in the register _S0 .

In addition, in this device, as shown in Fig. 7, levels T S +T _B , T _S +2T _B , T _S are set for switching the combustion amount with a temperature range T _B on the plus side of the set _temperature T _S.
Set +3T _B , and also set the same temperature range on the negative side.
Level T _S −T _B , T _S for switching the combustion amount with T _B
-2T _B and T _S -3T _B are set, and the detected temperature Ta is T _S
+3T _B When Ta, the oscillation period of the drive pulse is T ₁ =
E ₁ ×Tx, when T _S +3T _B > Ta > T _S +2T _B, T ₂
= E ₂ ×Tx, and when T _S +2T _B > Ta > T _S + T _B
T ₃ = E ₃ ×Tx, and when T _S + T _B > Ta > T _S , T ₄ =
Let E ₄ ×Tx, and when T _S > Ta > T _S − T _B , T ₅ = E ₅ ×
Tx, when T _S −T _B > Ta > T _S −2T _B, T ₆ = E ₆
×Tx, and when T _S −2T _B > Ta > T _S −3T _B, T ₇ =
E ₇ ×Tx, and when T _S −3T _B > Ta, T ₈ = E ₈ ×Tx
It is said that

FIG. 8 shows an example of control by the microcomputer 1. First, the set temperature T _S is set to 18°C. Then, the output of the drive pulse from the output terminal T is prohibited. In this state, register S ₀ is set to ROM
Set the numerical value E ₁ stored at address P _P +1 of . Also, store the same number E ₁ in the RAM area.
A Set to ₀ . In this state, a combustion program (not shown) is executed and the prohibition of outputting drive pulses from the output terminal T is canceled. Next, the switch 4 is operated, and a check is made to see if the input to the input terminal _I1 becomes "1" and then becomes "0". If the input to the input terminal _I1 becomes "1" and then becomes "0", the set temperature T _S is increased by 1°C. Next, set temperature T _S
Check whether the temperature has reached 31℃. and
If T _S = 31°C, set the set temperature T _S to 12°C. This is because the room temperature setting range is set at 12°C to 31°C. After this process, the input terminal
Input the room temperature detection signal from _I2 . Further, in the above, when the input terminal _I1 is "0", the room temperature detection signal is inputted immediately. Input terminal I ₂
The room temperature detection signal input to is first AD converted,
Subsequently, through arithmetic processing, the temperature is corrected to have the same scale as the set temperature T _S . In this way, the detected temperature Ta is obtained.

Next, check how far the detected temperature Ta is from the set temperature T _S. That is, the seventh
Check the position of the detected temperature Ta in the diagram.
If Ta-T _S >3T _B , the oscillation period of the drive pulse is set to T ₁ =E ₁ ×Tx, so the numerical value E ₁ stored at address P _P +1 in the ROM is loaded into the register S ₀ . Also, if Ta−T _S > 2T _B , the oscillation period of the drive pulse is T ₂ = E ₂ ×Tx, so the ROM P _P
The numerical value E ₂ stored at address +2 is transferred to register S ₀
Load into. Also, if Ta−T _S > T _B , the oscillation period of the drive pulse is T ₃ = E ₃ ×Tx, so the ROM
Load the numerical value E ₃ stored at address P _P +3 in register S ₀ . Also, if Ta > T _S , the oscillation period of the drive pulse is set to T ₄ = E ₄ ×Tx, so the ROM
The numerical value E ₄ stored at address P _P +4 of is loaded into register S ₀ . Also, if T _S −Ta > 3T _S , the oscillation period of the drive pulse is T ₈ = E ₈ ×Tx.
Load the numerical value _E8 stored at address P _P +8 in the ROM into register _S0 . Further, if T _S +Ta>2T _S , the numeric value E ₇ stored at address P _P +7 in the ROM is loaded into the register S ₀ in order to set the oscillation period of the drive pulse to T ₇ =E ₇ ×Tx. Also, if T _S −Ta > T _S , the oscillation period of the drive pulse is T ₆ = E ₆ ×Tx, so the value E ₆ stored at address P _P +6 in the ROM
Load into register S ₀ . Furthermore, if T _S > Ta, the oscillation period of the drive pulse is set to T ₅ = E ₅ ×Tx, so the value E ₅ stored at address P _P +5 in the ROM
Load into register S ₀ .

[Problems in the Background Art] However, when trying to measure the amount of kerosene supplied at each stage in a performance test using such a conventional device, a manually switched pseudo sensor such as a potentiometer is used instead of the thermistor 6 for detecting room temperature. need to be connected. This is because it is necessary to set various room temperature conditions in a fixed manner. In such a conventional device, one pseudo sensor must be used for each device, and when a large number of performance tests are to be conducted, the number of pseudo sensors is required, which is extremely inconvenient. In addition, when a pseudo sensor is used, there is a problem that the adjustment is extremely troublesome and takes a long time due to variations in the circuit. In particular, the room temperature range corresponds to one step of the supply amount of kerosene.
There was a problem that this adjustment became more difficult when T _B was small.

[Purpose of the Invention] This invention was made to solve such problems, and it is possible to reliably measure the change in the output amount at multiple stages set in advance with a simple operation. The purpose is to provide an air conditioner that allows easy adjustment work.

[Summary of the Invention] The present invention detects the ambient temperature with a temperature detection element and compares the detected temperature with a preset temperature, thereby detecting a plurality of stages preset according to the level of the temperature difference. In an air conditioner that controls the load for heating or cooling by selecting the corresponding output amount from the output amount, there is a first operation switch that switches between normal operation and test operation, and a first operation switch that changes the set temperature within a preset range. The second operation switch switches sequentially, and when the second operation switch is operated while the first operation switch is set to test operation, the preset plurality of operations are performed regardless of the temperature detection operation by the temperature detection element. A control means for controlling the load by sequentially selecting the output amount of the stages in a stepwise manner is provided.

[Embodiments of the Invention] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the present invention will be described as applied to a kerosene stove.

In FIG. 1, numeral 11 is a one-chip microcomputer with an AD (analog-to-digital) conversion function at its input terminal. This microcomputer 11 is connected to +V _C power supply. In addition, the +V _C power supply has a constant voltage diode 12 and a resistor 1.
3, a series circuit of a first operation switch 14 and a resistor 15 for switching between normal operation and test operation, and a second operation switch 1 for changing the set temperature.
6 and a series circuit of resistor 17 are connected to each other. The positive terminal of the +V _C and the diode 12
A series circuit of a thermistor 18 for detecting room temperature, which is a temperature detecting element, and a resistor 19 is connected between the connecting point of the resistor 13 and the resistor 13 . A connection point between the voltage regulator diode 12 and the resistor 13 is connected to the input terminal of the microcomputer 11, and sets a reference voltage V _REF for AD conversion. A connection point between the first operating switch 14 and the resistor 15 is connected to the input terminal _I0 of the microcomputer 11, a connecting point between the second operating switch 16 and the resistor 17 is connected to the input terminal _I1 , Further, the connection point between the thermistor 18 and the resistor 19 is connected to the input terminal _I2 .
A drive pulse (see FIG. 6) for driving and controlling the electromagnetic pump 20 is outputted to the output terminal T of the microcomputer 11. The electromagnetic pump 2
0 operates at a certain cycle in response to drive pulses and supplies kerosene to the burner.

The microcomputer 11 has a built-in CPU (central processing unit), ROM, RAM, etc.
As shown in Figure 2, RAM includes memory A ₀ and memory
A ₁ , a timer register S ₀ , a flag F ₀ , etc. are provided, and the ROM contains numerical values for determining the period of the drive pulse at addresses P _P +1 to _{P P} +8.
E ₁ , E ₂ , E ₃ , E ₄ , E ₅ , E ₆ , E ₇ , and E ₈ are set, respectively. The register _S0 contains the information of the ROM.
Numerical values loaded from addresses P _P +1 to _{P P} +8
Ex is stored in the memory A ₀ , and the register
ROM that stores the numerical value Ex loaded in S ₀
Addresses P _P +1 to _{P P} +8 are stored in the memory _A1 , and a set temperature T _S set in the range of 12°C to 31°C is stored in the memory A1.

The microcomputer 11 performs the processing shown in FIG. A distinctive feature of this process that differs from conventional processing is the level check of the input terminal _I0 that is performed first after the start. In this check, if the input terminal _I0 is "1", the flag
_F0 is set to "1", and if it is "0", flag _F0 is set to "0". After that, the same processing as before is performed. Furthermore, when the inhibition of output from the output terminal T is released, the flag _F0 is checked before checking the level of the input terminal _I1 .
In this check, if F ₀ =0, the same processing as the conventional one is performed. Furthermore, if F ₀ =1, characteristic processing not found in conventional processing is performed.
This process first checks whether the input terminal _I1 is at the "1" level, and if it is at the "1" level, then checks whether it has changed to the "0" level. If the value changes to , the ROM address P×P _P +1 to _{P P} +8), which is the content of the memory _A0 , is raised by one address. Then, it is checked whether the contents of memory _A0 are larger than address P _P +8. If it is larger, the contents of memory A ₀ are returned to the first address P _P +1. Finally, the contents of address Px stored in memory _A0 , that is, the numerical value Ex, are loaded into register _S0 . Further, in the above-mentioned check of the input terminal _I1 , if the input terminal _I1 is at the "0" level, this process is not performed and the process exits.

In the embodiment of the present invention having such a configuration, the first
When the operation switch 14 is turned on, the flag F ₀
is set to "1". And first register S ₀
The numerical value _E1 stored at the address P _P +1 is loaded into the memory A0, and the address P _P +1 is set in the memory _A0 . However, in this state, the thermistor 18
Regardless of temperature detection by the output terminal T, drive pulses with a width of Tt are supplied to the electromagnetic pump 20 from the output terminal T at intervals of E ₁ ×Tt. In this state, if you turn the second operation switch 16 on and off once, the memory
The address of A ₀ is increased by 1 and becomes P _P +2, and the contents of register S ₀ also become E ₂ accordingly.
Now, from the output terminal T, the period is E ₂ ×
A drive pulse having a width of Tt is supplied to the electromagnetic pump 20 every Tt. Furthermore, when the second operation switch 16 is turned on and off once, the address of the memory _A0 is increased by one to become P _P +3, and the contents of the register _S0 are accordingly changed to _E3 . However,
This time, from the output terminal T, the period is E ₃ × Tt, and the width is
A drive pulse of Tt is supplied to the electromagnetic pump 20.
Thereafter, each time the second operation switch 16 is turned on or off in this way, the address of memory _A0 is incremented by one, and becomes P _P +4, P _P +5, and so on.
Also, the contents of register S ₀ are changed accordingly to E ₄ , E ₅ , etc.
..., and the period of the drive pulse output from the output terminal T also changes to E ₄ ×Tt, E ₅ ×Tt, and so on. and the contents of memory A ₀ exceed P _P +8, i.e.
When P _P +9, the contents return to the initial P _P +1,
The contents of register _S0 also return to _E1 .

In this way, in the test operation state, each time the second operation switch 16 is turned on or off, the period of the drive pulse output from the output terminal T is E ₁ ×Tt, E ₂ ×
Tt, E ₄ ×Tt, E ₅ ×Tt……E ₈ ×Tt, E ₁ ×Tt,…
...is changed stepwise and repeatedly, and has no relation to the room temperature detection operation by the thermistor 18. Therefore, the electromagnetic pump 20 reliably supplies a corresponding amount of kerosene, and the supply at each stage. It becomes possible to reliably measure the amount of kerosene with a simple operation. In addition, there is no need to connect a pseudo sensor in place of a thermistor as in the past, so handling is easy and there is no need for any troublesome adjustments.

In addition, in order to cause this device to resume normal combustion operation, it is sufficient to turn off the first operation switch 14. If you do this, the flag F ₀ will be "0"
As a result, the numerical value Ex is determined by the relationship between the room temperature detected by the thermistor 18 and the set temperature, and the automatic room temperature adjustment function comes into operation.

In the above embodiments, the present invention was applied to a kerosene stove, but the present invention is not necessarily limited to this, and can also be applied to various air conditioners such as gas stoves, electric stoves, coolers, and air conditioners. be.

[Effects of the Invention] As detailed above, according to the present invention, it is possible to reliably measure the change in the output amount at multiple preset stages with simple operations, and therefore the air output amount can be easily adjusted. It can provide a harmonizing device.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a circuit configuration diagram, FIG. 2 is a main memory configuration diagram in RAM, and FIG. 3 is a main memory configuration diagram in ROM. Figure 4 is a flowchart showing control processing by a microcomputer, Figure 5 is a circuit configuration diagram showing a conventional example, Figure 6 is a waveform diagram showing drive pulses supplied to the electromagnetic pump, and Figure 7 is temperature difference with respect to set temperature. FIG. 8, which is a diagram for explaining the relationship between the stages and the period of the drive pulse, is a flowchart showing the control processing of a microcomputer in a conventional example. 11...Microcomputer, 14...1st
operation switch, 16... second operation switch,
20...Electromagnetic pump.

Claims (1)

[Claims] 1. By detecting the ambient temperature with a temperature detection element and comparing the detected temperature with a preset set temperature, the corresponding output amount is determined from the output amounts of multiple stages preset according to the level of the temperature difference. In an air conditioner that selectively controls a load for heating or cooling, a first operating switch switches between normal operation and test operation, and a second operating switch sequentially switches a set temperature within a preset range. , when the second operation switch is operated while the first operation switch is set to test operation, the preset output amount is set in multiple stages regardless of the temperature detection operation by the temperature detection element. 1. An air conditioner comprising: control means for sequentially selecting and controlling a load in stages.