JPH05215451A - Method of controlling temperature of refrigerator - Google Patents

Abstract

PURPOSE: To enhance freshness of content while preventing power consumption by calculating load thermal capacity, controlling inner temperature based on the thermal capacity and minimizing variation of the inner temperature. CONSTITUTION: A user can select desired mode, frequency and defrost period by operating a select key 101 and can set desired temperature of freezing chamber and refrigeration chamber by operating a temperature setting means 102. A temperature sensing means 103 senses temperature of the freezing chamber, refrigeration chamber, motors, and the like. A door sensing means 104 senses open/close of door of the freezing chamber and refrigeration chamber. An oscillation means 105 generates an oscillation signal. A control means 100 comprises a refrigerator control program and an A/D converter. A display means 106 displays temperature of the freezing chamber and refrigeration chamber, mode and time of the refrigerator, and the like. A drive means 107 drives a compressor and a fan. Control circuit for the inner lamp and the defrost heater is also provided. An alarm sound generating means 108 notified abnormal state of the refrigerator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control method for a refrigerator, and more particularly, by controlling the temperature inside the refrigerator according to the heat capacity of the contents, power consumption due to unnecessary operation is prevented, and The present invention relates to a temperature control method for a refrigerator that can improve the freshness of contents by reducing the temperature change range.

[0002]

2. Description of the Related Art In the conventional temperature control of a refrigerator, the temperature inside the refrigerator is controlled by controlling the driving of the compressor and the fan motor according to the temperature setting by the temperature controller, the number of times the door is opened and closed, and the defrosting period.

[0003]

By the way, in such a conventional temperature control method, since the temperature controller of the refrigerator is turned on or off, the temperature is adjusted between the upper limit value and the lower limit value of the set temperature. Since the temperature change width in the refrigerator is large,
There is a problem that not only the power consumption becomes large, but also the freshness of the contents is deteriorated.

[0004]

Therefore, the present invention calculates the load heat capacity, controls the temperature in the refrigerator by the heat capacity, and minimizes the temperature change width in the refrigerator to prevent power consumption and improve the freshness of the contents. The purpose is to be able to plan.

[0005]

To achieve the above object, a temperature control method for a refrigerator according to the present invention comprises a temperature difference between an initial internal temperature and a set temperature, an initial internal temperature and an internal temperature after a predetermined time has elapsed. Fan motor control based on the heat capacity and the fuzzy inference, which determines the heat capacity of the contents based on the temperature difference from the temperature and the temperature difference between the temperature and the set temperature after a lapse of a predetermined time. The fan motor control signal determining step determines a signal, and the fan motor control signal determined in the fan motor control signal determining step controls the fan motor to control the temperature in the refrigerator.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment applied to the present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, the selection means 101 is composed of keys for selecting a mode (automatic or manual), frequency selection, and defrost cycle, and a desired mode, frequency, and defrost cycle are selected by the user's operation of the above keys. become able to. The temperature setting means 102 is composed of a freezing chamber and a key or a variable resistor capable of setting the temperature inside the refrigerating chamber to a desired temperature, and the desired temperature is set by a user's operation. The temperature sensing means 103 is composed of a temperature sensor such as a damistor, and senses the temperatures of the freezer compartment, the refrigerator compartment, the motor, and the like. The door detection means 104 detects the state (open / close) of the freezer compartment door and the refrigerator compartment door. The oscillating means 105 produces an oscillating signal. When this oscillation signal is divided, it becomes a clock having a predetermined cycle, and this clock is used as a drive clock for driving a circuit for refrigeration and a clock provided in a refrigerator. The control means 100 is composed of a control program and a memory for storing data required for arithmetic processing so that the refrigerator can be controlled by the control method of the present invention, and an AD converter for converting an input analog signal into a digital signal. .. The display unit 106 is composed of an LCD or the like, and displays the temperature of the freezing and refrigerating room, the mode and time of the refrigerator, and the like. The drive means 107 drives a compressor motor and a fan. The driving means 107 also includes a control circuit for operating the interior light and the defrost heater.

The alarm sound generating means 108 is composed of a buzzer and emits a warning sound for notifying the user of an abnormal state of the refrigerator (for example, when the door is open for a long time). Therefore, as shown in FIG. 2, when power is applied to the control circuit of the refrigerator, the oscillation signal generated by the generation means 105 is input to the control means 100, and the oscillation signal generated by the oscillation means 105 is divided by the control means 100. It is used as a drive clock for various circuits forming the control means 100.

After that, when the user uses the selecting means 101 and the temperature setting means 102 to select the mode (automatic or manual), the frequency, the defrost cycle, etc., and sets the freezing and refrigerating room temperatures, the control means 100 becomes Upon recognizing this and displaying it via the display means, the refrigerator is driven by the drive means 107. At this time, the temperature sensing means 103
Senses the temperature of the freezing and refrigerating compartment and outputs it to the control means 100. The control means 100 displays the input temperature from the temperature sensing means 103 on the display means 106 and senses the temperature set by the temperature setting means 102. When the temperature of the compressor and the fan motor exceeds a certain temperature, the control unit 100 determines that the compressor is overheated, stops the operation of the refrigerator through the drive unit 107, and causes the alarm generation unit 108 to overheat the user. Notify that you are in a state. Here, the overheated state of the motor is displayed by the display means 106.
It can also be displayed through.

On the other hand, the door sensing means 104 senses whether the door of the freezing and refrigerating room is open and outputs it to the control means 100. The control means 100 recognizes the sensed open state of the door and opens the door for a long time. If so, the alarm sound generating means 10
8 is driven so that the user recognizes the open state of the door. Of course, also at this time, the state in which the door is open can be displayed through the display means 106.

Referring to FIG. 2, the temperature control method of the refrigerator according to the present invention detects the temperature inside the refrigerator at a predetermined time interval after initialization and initial setting to issue a fan control signal, and indicates the state of the refrigerator to indicate that the motor is overheated. And an initial drive stage that detects the door state, and after performing this initial drive stage, when the defrosting is in progress, the defrost heater is driven and the compressor and fan are stopped to perform defrosting. When the driving condition is satisfied, the compressor is driven and the fan is driven by the fan control signal set in the initial driving stage.

This will be described in detail with reference to FIG. First, when power is applied to the refrigerator, the components of the refrigerator are initialized 200 in a state where they start to operate. After that, when the user uses the selecting means 101 or the temperature setting means 102 to set (or set) 201 the automatic / manual mode of the refrigerator, the frequency, the defrosting cycle, the freezing / refrigerating room temperature, etc., the refrigerator Operates according to the set conditions. Thereafter, the control means 100 senses the temperature of the freezing and refrigerating compartment through the temperature sensing means 103.
Do 3. At this time, when the compressor is in operation, the control means 100 obtains the heat capacity of the food put in the refrigerator based on the temperature of the freezing and refrigerating room sensed by the temperature sensing means 103, and the fan control signal according to the heat capacity. emit y. Further, the control means 100 displays the temperature of the freezing and refrigerating compartment and the automatic / manual mode time (204) through the display means 106, and detects the temperature of the compressor and the fan motor through the temperature sensing means 103 to detect overheating. Then, it detects through the door sensing means 104 whether the freezing and refrigerating room doors are open.

Here, the freezing and refrigerating room temperature sensing 203
And fan control signal generation 300, refrigerator status display 204, compressor and fan motor overheat, door status detection 205 for a predetermined time (eg, 3.4 msec)
Repeated 202 at intervals.

On the other hand, when the control means 100 determines that the compressor or fan motor is overheated and the freezing or refrigerating room door is open for a long time, the control means 100 drives the alarm generating means 108 to notify the user of the abnormality 207.

After that, the control means 100 judges that the defrosting is in progress.
08: If defrosting is in progress, the driving means 107 drives the defrosting heater to turn on, and the compressor and fan are stopped 210 to defrost. If defrosting is not in progress, the defrosting heater is turned off 211, and it is determined 212 whether the initial delay is in progress. 210 Compressor and fan stopped during initial delay 210
Then, it is determined 213 whether the driving condition is satisfied unless the initial delay is being performed. That is, it is determined whether or not the condition such as the drivable time has elapsed after the compressor is turned off.

The control means 100 stops 214 the driving of the compressor and the fan if the conditions are not satisfied. If satisfied, the compressor is driven and the fan is driven 214 by the fan control signal y corresponding to the heat capacity of food and drink in the refrigerator.

Here, the alarm sound control 207, the determination 208 of whether or not defrosting is possible, the defrosting 209 and 210, the compressor and fan drives 211, 212, 213 and 214 are normally 1 se.
It is performed at the c interval 206.

Next, referring to FIG. 3, the fan control signal generation routine 300 judges whether the compressor is in operation (ON) 301, and if it is in operation, the internal cold storage temperature T1.
And a preset temperature Ts, a first temperature difference determination step 302 for obtaining a temperature difference dT1 and 303 after storing the initial temperature T1 of the refrigerator and the first temperature difference dT1 303, a predetermined time t elapses 3
04, the second temperature difference determining step 30 for obtaining the temperature difference dT2 between the initial internal temperature T1 and the internal temperature T2 after the elapse of the predetermined time T
5, a heat capacity determining step 306 for obtaining the heat capacity m from the first and second temperature differences dT1, dT2, and a third temperature difference determining step for finding a temperature difference dT3 between the internal temperature T2 and the set temperature Ts after a predetermined time t. 307 and a fan control signal determining step 308 that determines a fan control signal y based on the third temperature difference dT3 and the heat capacity m.

The fan control signal y determined by the fan control signal generation routine 300 as described above is stored in the memory and then the fan speed is controlled in the main driving stage.

Next, the fan control signal generating routine according to the present invention will be described in detail with reference to FIG. First, the control means 100 judges whether or not the compressor is being driven 301,
During driving, a first temperature difference dT1 between the initial internal temperature T1 sensed by the temperature sensing means 103 and the temperature Ts set by the temperature setting means 102 is calculated 302 according to the following equation (1). dT1 = T1-Ts (Equation (1)) The control means 100 stores the first temperature difference dT1 and the initial internal temperature T1 calculated by the above equation (1) in the internal memory (3).
03). At this time, the temperature Ts is also already stored in the internal memory.

Thereafter, it is determined 304 whether or not a predetermined time t that can be set arbitrarily has elapsed, and when the specific time t has elapsed, the second internal temperature T1 and the internal temperature T2 after the specific time elapses.
The temperature difference dT2 is calculated 305 as in the following equation (2). dT2 = T1-T2 ... Formula (2)

The control means 100 uses the calculated second temperature difference dT2 and the second temperature difference dT2 calculated by the equation (1) and then stored in the internal memory to heat the contents of the refrigerator. Calculate 306 for m.

The heat capacity m is calculated by the control means 100 according to the following <Table 1>. (Hereafter, margin).

Here, <Chart 1> is made by fuzzy reasoning by dividing the first temperature difference dT1 and the second temperature difference dT2 into 10 equal parts. According to the above chart 1, the first and second temperature difference dT
If 1 and dT2 are all 5, the heat capacity m is 5, and if they are all 10, the heat capacity m is 0.

On the other hand, when food (hot food) having a large heat capacity m is put in the refrigerator, the temperature inside the refrigerator may rise instantaneously. However, by increasing the predetermined time t a little after the predetermined time t. Internal temperature T2 is the initial internal temperature T1
Can be lower. In addition, when food having a small heat capacity is put in, there may be a case where the internal temperature T2 after the predetermined time t is lower than the set temperature Ts,
At this time, since the temperature inside the refrigerator sensed by the temperature sensing means 103 is lower than the temperature set by the temperature setting means 102, the control means 100 stops the driving of the compressor and the fan through the driving means 107.

As described above, when the heat capacity m is obtained from the above <Table 1>, the third temperature difference dT3 between the internal temperature T2 and the set temperature Ts after the predetermined time t is calculated 307. The fan control signal y is calculated 308 from the third temperature difference and the heat capacity m calculated above. Where the fan control signal y
Is controlled by the control means 100 according to the following <Table 2>.

Here, the above <Chart 2> is the third temperature difference dT3 which is the temperature difference between the temperature T2 and the set temperature Ts after the predetermined time t.
Then, the fan control signal y is determined by fuzzy reasoning by dividing the heat capacity m of the content determined in <Chart 1> into 10 equal parts.

According to the above <Table 2>, the heat capacity m and the third
If the temperature differences dT3 are all 5, the fan control signal y is 5
And if all 10 then the fan control signal y is 1
It becomes 0. In this way, the control means 100 determines 308 the fan control signal y based on the third temperature difference dT3 and the heat capacity of the contents. After the fan control signal y is stored in the internal memory, when the compressor driving condition is satisfied 213 as shown in FIG. 2, when the compressor and the fan are driven 214, the fan speed is controlled to control the internal cold storage temperature.

At this time, since the general control means performs the calculation in hexadecimal, the heat capacity m calculation table of <Chart 1> is stored in the memory in hexadecimal as shown in <Chart 3> below. The chart for calculating fan control signal y in <Chart 2> is shown in <Chart 4> below.
It is stored in the memory as a hexadecimal number. (Hereafter, margin).

[0029]

Further, in the case of a general refrigerator, the speed control of the compressor motor is not possible, and in the case of a fan motor, it can be controlled in two stages. Therefore, as shown in the following <Table 5>, the fan signal according to the above <Table 2> When y is larger than 5, the fan motor can be controlled to be strong or weak by classifying into 1 and 0 otherwise.

However, it is needless to say that the case of controlling in two stages of strength and weakness is the case of a general fan motor, and it may be controlled in multiple stages depending on the case. (Hereafter, margin).

[0032]

According to the temperature control method for a refrigerator of the present invention, the temperature inside the refrigerator is controlled by controlling the temperature inside the refrigerator in accordance with the heat capacity of the contents, and the width of temperature change inside the refrigerator is reduced. It has the effect of improving the freshness of the contents. It is obvious that the present invention can be variously modified without departing from the scope, and in particular, the flowchart can achieve the object of the present invention by various modifications.

[Brief description of drawings]

FIG. 1 is a block diagram of a control circuit of a normal refrigerator applied to the present invention.

FIG. 2 is a flow chart of a refrigerator temperature control method of the present invention.

FIG. 3 is a flow chart of a fan control signal generation routine.

FIG. 4 is a temperature characteristic diagram of a refrigerator inside controlled by the present invention.

[Explanation of symbols]

 101 Selection Means 102 Temperature Setting Means 103 Temperature Sensing Means 104 Door Sensing Means 105 Oscillating Means 106 Display Means 107 Driving Means 108 Alarm Sound Generating Means

Claims (6)

[Claims] 1. A heat capacity determining step of obtaining a heat capacity of a content by a temperature difference between an initial internal temperature and a set temperature and a temperature difference between the initial internal temperature and an internal temperature after a predetermined time has elapsed, and after a predetermined time has elapsed. The fan motor control signal determination step of determining the fan motor control signal by the heat capacity determined in the heat capacity determination step and the fuzzy inference, and the fan motor control signal determination step. A temperature control step of controlling the fan motor by the generated fan motor control signal to control the temperature inside the refrigerator. 2. The heat capacity determining step comprises a first temperature difference determining step of determining whether the compressor is in operation and, if it is in operation, obtaining a temperature difference between the initial temperature inside the refrigerator and the set temperature, and a refrigerator initial temperature. After the temperature difference obtained in the first temperature difference determination step is stored, a second temperature difference determination for determining a temperature difference between the initial internal temperature and the internal temperature after the predetermined time has elapsed when a predetermined time has elapsed The temperature control method for a refrigerator according to claim 1, further comprising a step and a heat capacity setting step of obtaining a heat capacity based on the temperature difference determined in the first and second temperature difference determining steps. 3. The fan motor control signal determining step comprises a third temperature difference determining step of obtaining a temperature difference between the internal temperature and the set temperature after a predetermined time, and a temperature difference determined in the third temperature difference determining step. 2. The temperature control method for a refrigerator according to claim 1, further comprising: a fan motor control signal setting step of determining a fan control signal by fuzzy inference with a heat capacity. 4. The temperature control method for a refrigerator according to claim 1, wherein in the temperature control step, the temperature of the refrigerator is controlled by controlling the speed of the fan motor by the fan motor control signal together with the driving of the compressor. 5. The fan motor control signal is at least 2
The temperature control method for a refrigerator according to claim 4, wherein the speed of the fan motor is controlled in stages or more. 6. The refrigerator according to claim 1, wherein the fan control signal is set by fuzzy reasoning with a heat capacity by calculating a temperature difference between the internal temperature and the set temperature after a predetermined time. Temperature control method.