JPH05181571A - Microcomputer control device - Google Patents

Abstract

PURPOSE:To evade such defects as the reduction of the lifetime of a nonvolatile memory, the use of an expensive nonvolatile memory, etc., by reducing the frequency to write the data into the nonvolatile memory in regard of a microcomputer control device which uses the nonvolatile memory to preserve the data against the interruption of the supply of power. CONSTITUTION:A control unit 4 contains a microcomputer and is connected to a DC power supply part 3. A voltage drop detecting means 5 is electrically provided between the unit 4 and the part 3 and detects that the output voltage of the part 3 is set at a fixed level to output a signal SIG1 to the unit 4. Then a nonvolatile memory 7 is connected to the unit 4 and can read and write the data. In such a constitution, the data are written into the memory 7 when the signal SIG1 is outputted from the means 5 due to a power failure, etc., and then detected by the unit 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microcomputer control device, and more particularly to improvement of data protection in the microcomputer control device.

[0002]

2. Description of the Related Art Conventionally, in a so-called microcomputer control device having a microcomputer, in order to prevent the internal data such as an accumulated time from being lost even if a power failure or an unexpected power cutoff occurs, a fixed time interval is set. In addition, data protection means such as writing data in the non-volatile memory or writing data in the non-volatile memory each time the control device itself is stopped is taken.

Further, among the devices whose operating states can be controlled by a microcomputer, as a method for detecting the replacement time of a replaceable air filter in an air conditioner such as an air purifier, for example, a user There is a check method in which the degree of color change of a filter is compared with a reference color label and the life of the air filter is detected when the color is about the same. However, this is troublesome because the user needs to check it at any time, and there is a problem that it is difficult for the user to properly determine the life because the determination is made based on the subtle color difference.

Therefore, conventionally, a configuration is considered in which the air-conditioning operation integrated time of the air conditioner is counted, and when the air-conditioning operation integrated time reaches a predetermined time, the air filter replacement time is automatically determined. Was there. In this case, in order to prevent the data of accumulated air conditioning operation time from being lost in the event of a power outage or unexpected power interruption during operation, write the data of accumulated air conditioning operation time to the non-volatile memory at regular intervals. Alternatively, a means such as writing to the non-volatile memory each time the device is stopped is taken.

[0005]

However, although the loss of data caused by a power outage or an unexpected power cutoff does not occur frequently, the conventional means for data protection of the microcomputer control device is adopted. Then, since data is frequently written to the nonvolatile memory, there is a problem that the lifetime of the nonvolatile memory is extremely shortened or an expensive nonvolatile memory must be used to extend the lifetime. It was happening.

Also in the air conditioner, the life of the non-volatile memory is extremely shortened due to the same situation as described above, or an expensive non-volatile memory must be used to extend the life of the non-volatile memory. There were challenges.

The present invention has been made in view of the above circumstances, and an object thereof is to reduce the number of times data is written in a nonvolatile memory, thereby preventing the lifetime of the nonvolatile memory from being shortened. It is to provide a control device.

[0008]

In order to achieve the above object, the present invention is provided with a DC power supply unit which is connected to an AC power supply unit and converts an AC voltage from the AC power supply unit into a DC voltage.
A control unit having a microcomputer is connected to the DC power supply unit, and a signal is controlled by detecting that the output voltage from the DC power supply unit falls below a certain level between the control unit and the DC power supply unit. The voltage drop detection means for outputting to the unit is electrically connected, and the voltage supplied from the DC power supply unit to the control unit between the control unit and the DC power supply unit becomes a voltage that can operate the control unit. A control unit reset circuit section that outputs a signal for starting the operation of the control unit when
An operation unit for setting the operation of the control unit is connected to the control unit, a non-volatile memory capable of writing and reading data is connected to the control unit, and the signal output from the voltage drop detecting means is connected to the control unit. It is characterized in that the data in the control unit is written in the nonvolatile memory when the control unit detects it.

Further, the present invention is, in an air conditioner equipped with a replaceable air filter, a DC power supply unit for connecting to an AC power supply unit and converting the AC voltage from the AC power supply unit into a DC voltage, and the DC power supply unit. An air conditioning control unit that is connected to the power supply unit and has a microcomputer, and detects that the output voltage from the DC power supply unit provided between the air conditioning control unit and the DC power supply unit is below a certain level. A voltage drop detecting means for outputting a signal to the air conditioning control unit, and a voltage provided between the air conditioning control unit and the DC power supply unit to the air conditioning control unit for operating the air conditioning control unit. A control unit reset circuit section that outputs a signal for starting the operation of the air conditioning control unit when the voltage becomes possible, and the air conditioning control unit. Display unit for confirming the operating state of the air conditioner, an operation unit for connecting to the air conditioning control unit to set the operation of the air conditioning control unit, and a unit for connecting to the air conditioning control unit to write and read data of the air conditioning operation accumulated time. A non-volatile memory is provided, and when the air conditioning operation integrated time reaches a predetermined time, the air conditioning control unit displays on the display means that it is time to replace the air filter, and outputs from the voltage drop detection means. When the air-conditioning control unit detects the generated signal, it is characterized in that the data of the air-conditioning operation integrated time is written in the nonvolatile memory.

[0010]

According to the microcomputer control device of the present invention, when the voltage of the AC power supply unit drops and the voltage of the DC power supply unit drops below a certain voltage accordingly, the voltage drop detecting means drops. Is output to the control unit. When the control unit receives the signal, it writes the data inside the control unit to the non-volatile memory.

As a result, even if the voltage supplied from the AC power supply unit is completely lost, the data in the control unit remains in the non-volatile memory and is not lost.

Further, since the data is written in the non-volatile memory only when the voltage of the DC power supply unit drops, the number of times of writing in the non-volatile memory becomes the necessary number, and the life of the non-volatile memory is not shortened.

According to the air conditioner of the second aspect, when the voltage of the AC power supply unit drops and the voltage of the DC power supply unit drops below a certain voltage accordingly, the voltage drop detecting means drops. The signal which detected is output to the air conditioning control unit. Upon receiving the signal, the air conditioning control unit writes the data of the air conditioning operation accumulated time stored in the air conditioning control unit in the nonvolatile memory.

As a result, even when the voltage supplied from the AC power supply unit is completely lost, the data of the air conditioning operation integrated time in the air conditioning control unit remains in the non-volatile memory and is not lost.

Therefore, since the data of the air-conditioning operation integrated time is written in the non-volatile memory only when the voltage of the DC power supply unit drops, the number of times of writing in the non-volatile memory can be reduced to the necessary minimum. It will not reduce the life of the memory.

When the data of such cumulative air-conditioning operation time reaches a predetermined time, the air-conditioning control unit displays on the display means that it is time to replace the air filter.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

First, the overall configuration will be described with reference to the system block diagram of FIG.

An AC power supply unit 1 having an AC voltage of 100 V is connected to a DC power supply unit 3 via a bus 2. The DC power supply unit 3 supplies an AC voltage of 100 V (V) to the control unit 4 having a microcomputer.
Is converted into a DC voltage of, for example, 5 V (V) for normal operation, and supplied.

The voltage drop detecting means 5 receives the first output voltage from the DC power supply section 3 as an input, and detects that the input value drops below a certain value. Voltage drop detection signal SIG1 which is a signal
Is output to the control unit 4.

The control unit reset circuit section 6 also receives the first output voltage from the DC power supply section 3, and this input value is a voltage lower than the voltage drop detection signal SIG1 being output. When a voltage of 7 volts (V) is detected that is sufficient to supply a voltage of 5 volts (V) suitable for the unit 4 to operate normally, the control unit 4
The signal SIG2 for instructing the operation start of is output to the control unit 4.

The non-volatile memory 7 is used by the control unit 4 to write data such as the accumulated operating time stored therein and to read the written data as needed, and to supply power. It is a memory that does not lose its data even if it disappears, and is connected to the control unit 4.

The operation section 8 for instructing the control unit 4 to turn on / off the power switch and to control the control unit is the control unit 4
The display unit 9 is also connected to the control unit 4 and is capable of visually determining whether the control unit 4 is operating.

Next, the operation of the above structure will be specifically described.

When the DC power supply unit 3 is connected to the AC power supply unit 1 having an AC voltage of 100 V, that is, from "start" to step S1 in FIG. As can be seen from FIG. 3, which is a characteristic diagram of the DC power supply unit 3 in which the vertical axis represents voltage and the horizontal axis represents time, first, the primary DC voltage 10 in the DC power supply unit 3 which is also the first output voltage
Gradually rises.

When the primary DC voltage 10 exceeds 7 volts (V), the secondary DC voltage which is a stable DC voltage of 5 volts (V) from the DC power supply unit 3 to the control unit 4. 11 is supplied, the control unit reset circuit section 6 outputs to the control unit 4 a signal SIG2 instructing the operation start of the control unit 4.

Further, the primary DC voltage 10 continues to rise, and the voltage drop detecting means 5 judges that the voltage is a down voltage 9
It stabilizes at 14 V (V) beyond the volt (V), during which the voltage detection means 5 outputs the voltage drop detection signal S.
IG is not output. The reason for this is that the voltage drop detecting means 5
Indicates that the primary DC voltage 10 rises from 0 volt (V) and once exceeds 9 volt (V), then the voltage drops to 9 V.
This is because the voltage drop detection signal SIG1 is output to the control unit 4 only when the voltage drops below the volt (V), so that the primary DC voltage 10 is simply below the reference value of 9 volt (V). This is because the voltage drop detection means 5 does not output the voltage drop detection signal SIG1 even if there is.

In step S1, the data stored in the non-volatile memory 7, such as the cumulative time during which the control unit 4 has been operated, is read out. However, when the control unit 4 is operated for the first time this time, no data is stored in the non-volatile memory 7, and therefore the process proceeds to the next step S2 without changing the initial data.

In step S2, the system control program stored in the ROM (read-only memory) of the microcomputer in the control unit 4 is executed.

The next step S3 is a judging section for indirectly detecting that the power supply from the AC power supply section 1 to the DC power supply section 3 is stopped due to a power failure or the plug being unplugged from the outlet. This is achieved by the voltage drop detecting means 5 monitoring the output of the primary DC voltage 10 of the DC power supply unit 3.

Even if the power supply does not change, or even a slight change occurs, if the primary DC voltage 10 is equal to or higher than the reference voltage of 9 V (V), step S2 is performed. Enter the loop of S3.

When the switch of the operating portion 8 is turned on while the loop of steps S2 and S3 is entered, the control unit 4 receiving this signal displays a signal to the display means 9 indicating that it is operating normally. Continue to output.

However, the signal output to the display means 9 does not have to be a special signal for indicating the operation, and for example, the signal indicating the air volume of the fan such as high, medium, or low indicates the operation of the control unit 4. It's ridiculous to show.

Further, in this step S3, the voltage of the primary DC voltage 10 drops, and the voltage drop detecting means 5 makes the first
When it is detected that the voltage is lower than the reference voltage of the next DC voltage 10, which is 9 volts (V), the voltage drop detection signal SIG
1 is output to the control unit 4.

In the next step S4, the control unit 4 accepts the input of the voltage drop detection signal SIG1, so that the data stored in the RAM or the like inside the control unit 4 disappears when the power supply is lost. The lost data is written in the nonvolatile memory 7.

In step S5, it is judged whether or not the primary DC voltage 10 continues to decrease, and it is necessary to supply the control unit 4 with a stable DC voltage of 5 V (V). Until the primary DC voltage 10 is not lower than 7 volts (V), that is, until the control unit reset circuit section 6 outputs the signal SIG2 (step S6), the loop of steps S5 and S6 is entered. However, when the control unit reset circuit section 6 stops outputting the signal SIG2, the microcomputer control device is completely stopped.

As described above, the present embodiment is provided with the voltage drop detecting means 5 for detecting the voltage drop of the DC power supply section 3, and the control unit 4 sends the voltage drop detecting signal SIG1 from the voltage drop detecting means 5 to the control unit. The data in the control unit 4 is written and saved in the non-volatile memory 7 only when the data is received by the No. 4, so that the data can be saved in case of a power failure and the data is frequently non-volatile. Since it is not necessary to write in the memory 7, the life of the non-volatile memory 7 is not unnecessarily shortened, and therefore it is not necessary to use an expensive non-volatile memory, and the price of the product itself is prevented from rising. You can also

Further, since the detection value for judging the voltage drop is set to a value higher than the minimum voltage required to send a stable voltage from the DC power supply section 3 to the control unit 4,
Even if the power supply is cut off, the control unit 4 has sufficient time and power to write data in the non-volatile memory 7, so that the data can be surely stored in the non-volatile memory 7.

Further, the normal operation of the control unit 4 can be easily visually confirmed by the display means.

As long as the voltage drop detecting means and the control unit reset circuit section have their functions, they need not be physically located between the DC power supply section and the control unit. Various modifications are possible, such as being provided in the same circuit as the power supply unit.

FIG. 4 and FIG. 5 show an air conditioner according to a second embodiment of the present invention, and only parts different from the first embodiment will be described below.

FIG. 4 is a system block diagram showing the entire structure. The air conditioning control unit 12 is provided in place of the control unit 4 in the first embodiment, and a program for controlling the air conditioning operation is provided. It is stored in advance.

The nonvolatile memory 7 is used for the air conditioning control unit 1
2 is for writing the data of the air-conditioning operation accumulated time stored in it, and for reading the written data when necessary, the data of the air-conditioning operation accumulated time is stored even if the power is cut off. It is a memory that does not disappear and is connected to the air conditioning control unit 12.

An operation unit 8 for instructing the air conditioning control unit 12 to turn on / off the power switch and control the air conditioning operation.
Is connected to the air conditioning control unit 12. Display means 1
Reference numeral 3 indicates the operating state of the air conditioning control unit 12 (for example, turning on the LED or the like in the operating state) or the replacement time of a replaceable air filter (not shown) by, for example, the letters "filter check", It is connected to the air-conditioning control unit 12.

The fan motor 14 is connected to the air conditioning control unit 12 via a drive circuit 15 and is rotationally driven in response to a control signal from the air conditioning control unit 12 to pass dirty air through an air filter (not shown). Generate an air flow for filtration.

Next, the operation of this embodiment will be described with reference to the program shown in the flowchart of FIG.

The DC power supply unit 3 includes the AC power supply units 1 to 100.
When a volt AC voltage is applied, it is converted to a DC power source and output. At this time, the primary output voltage of the DC power supply unit 3 gradually rises, and when the output voltage exceeds 7 volts (V), the secondary output voltage of 5 volts (V) is controlled by air conditioning. It will be given to the unit 12. In addition, the control unit reset circuit unit 6 includes the air conditioning control unit 12
The signal SIG2 for instructing the start of the operation is output to the air conditioning control unit 12.

Further, the primary DC voltage continues to rise, and exceeds the voltage of 9 V (V) which the voltage drop detecting means 5 judges to be a voltage drop, and stabilizes at 14 V (V), during which the voltage drops. The voltage drop detection signal SIG1 is not output from the detection means 5.

The reason for this is that the voltage drop detecting means 5 has the first
The next DC voltage rises from 0 volt (V) and once exceeds 9 volt (V), then the voltage drops to 9 volt (V).
This is because the voltage drop detection signal SIG1 is output to the air conditioning control unit 12 only when the voltage drops below the voltage level. Therefore, even if the primary DC voltage is 9 V (V) or less, which is the reference value, the voltage is simply This is because the voltage drop detecting means 5 does not output the voltage drop detection signal SIG1.

Now, when the air-conditioning control unit 12 is supplied with power in this way, it starts the program according to the flow chart shown in FIG. Air conditioning control unit 12
In step P1, the data of the air-conditioning operation integrated time stored in the nonvolatile memory 7 is read out. The data of the air-conditioning operation integrated time is the time when the air-conditioning control unit 12 has performed the air-conditioning operation control, and when the air-conditioning control unit 12 is operated for the first time, the data is not yet stored in the nonvolatile memory 7. Since it is not stored, the initial data is left as it is and the process proceeds to step P2.

The air conditioning control unit 12 executes step P2.
Then, the air-conditioning operation control program stored in the ROM (read-only memory) is read out and the air-conditioning operation control is executed based on the program. In this case, the fan motor 14 is rotationally driven in response to a control signal provided from the air conditioning control unit 12 via the drive circuit 15, whereby the dirty air (not shown) is sucked in and filtered through the air filter. It is designed to be discharged.

Further, the air conditioning control unit 12 counts the integrated time during the air conditioning operation as described above, and stores the integrated time of the air conditioning operation in a memory such as an internal RAM. Then, the air conditioning control unit 12 determines that the data value of the air conditioning operation integrated time is a predetermined time value, that is, the operation time corresponding to the replacement time of the air filter (for example, 150 hours).
When it reaches 0 hour), a display signal indicating the time of air filter replacement is output to the display means 13 to display "filter check".

The next step P3 is a judging section for indirectly detecting that the power supply from the AC power supply section 1 to the DC power supply section 3 is stopped due to a power failure or the plug being unplugged from the outlet. This is achieved by the voltage drop detecting means 5 monitoring the output of the primary DC voltage of the DC power supply unit 3.

If the power supply does not change or the primary DC voltage is higher than the reference voltage of 9 V (V) even if a slight change occurs, the air conditioning control unit 12 enters the loop of steps P2 and P3.

When the switch of the operation section 8 is turned on while the loop of steps P2 and P3 is entered, the air-conditioning control unit 12 receiving this signal displays a signal indicating that the air-conditioning control unit 12 is operating normally. Continue to output. In addition, the display unit 13 displays the operating state of the air conditioning operation in accordance with a display signal given from the air conditioning control unit 12, for example, strong / medium /
It is designed to be displayed according to the fan air volume such as weak.

Then, in this step P3, the air conditioning control unit 12 judges whether or not the voltage drop detection means 5 has output the voltage drop detection signal SIG1. In this case, when the voltage of the primary DC voltage drops and the voltage drop detecting means 5 detects that the voltage has dropped below the reference voltage of the primary DC voltage 10 of 9 volts (V), the voltage drop. Since the detection signal SIG1 is output to the air conditioning control unit 12, the determination is made based on this.

Therefore, when the voltage drop detection signal SIG1 is input in step P3, the air conditioning control unit 12 determines "YES" and proceeds to step P4.
After writing the air-conditioning operation accumulated time data stored and stored in the RAM to the nonvolatile memory 7, the process proceeds to step P5.

In step P3, the air conditioning control unit 12 sends the voltage drop detection signal SI from the voltage drop detection means 5.
If G1 is not input, it is determined to be "NO" here and the process returns to step P2.

In step P5, it is judged whether or not the primary DC voltage continues to decrease, and it is necessary at least to supply a stable DC 5V voltage to the air conditioning control unit 12. Before the primary DC voltage 10 becomes 7 V (V) or less, that is, until the control unit reset circuit section 6 outputs the signal SIG2 (step P6), the loop of steps P5 and P6 is performed. However, when the control unit reset circuit section 6 stops outputting the signal SIG2, the microcomputer control device is completely stopped.

In this state, the air conditioning control unit 12 is stored in the nonvolatile memory 7 until just before the power is cut off.
Data of the air-conditioning operation integrated time which has been counted and stored in the RAM is stored and stored. When the power is next turned on and the operation is restarted, the step P1 is performed as described above.
Since it is read into the air conditioning control unit 12, the accurate accumulated time of the air conditioning operation is saved regardless of whether the power is on or off.

As described above, the present invention is provided with the voltage drop detecting means 5 for detecting the voltage drop of the DC power supply section 3, and the air conditioning control unit 12 receives the voltage drop detecting signal SIG1 from the voltage drop detecting means 5. The data of the air conditioning operation integrated time in the air conditioning control unit 12 is written and saved in the non-volatile memory 7 only when the data is stored, so not only can the data be saved in case of a power failure, but also the data can be stored more frequently than necessary. Since it is not necessary to write in the non-volatile memory 7, the life of the non-volatile memory 7 is not shortened unnecessarily, and therefore it is not necessary to use an expensive non-volatile memory, and the price of the product itself rises. Can be prevented.

Further, since the detected value for judging the voltage drop is set to a value higher than the minimum required voltage for sending a stable voltage from the DC power supply unit 3 to the air conditioning control unit 12, even if the power is supplied. Since the air conditioning control unit 12 has enough time and power to write the data of the air conditioning operation integrated time in the non-volatile memory 7 even when the data disappears, the data can be surely stored in the non-volatile memory 7. ..

Further, the normal operating state of the air conditioning control unit 12 can be visually confirmed easily by the display means.

[0064]

According to the microcomputer control device of the first aspect, the control unit connected to the DC power supply unit and having the microcomputer, and the DC power supply unit provided between the control unit and the DC power supply unit. A voltage drop detecting means for detecting that the output voltage from the device is below a certain level and outputting a signal to the control unit; and a nonvolatile memory capable of writing and reading data by connecting to the control unit. Since the data is written to the non-volatile memory when the control unit detects the signal output from the voltage drop detecting means, the data can be saved in case of power interruption such as power failure. Even if it uses a non-volatile memory as much as possible, by reducing the number of times data is written to the non-volatile memory, Excellent effects that have never result in shortening the memory of life.

According to the air conditioner of the second aspect, the air conditioning control unit connected to the DC power supply unit and having a microcomputer, and the DC power supply unit provided between the air conditioning control unit and the DC power supply unit. A voltage drop detecting means for detecting that the output voltage of the device has fallen below a certain level and outputting a signal to the air conditioning control unit, and a non-volatile memory capable of writing and reading data by connecting to the air conditioning control unit. When the air conditioning control unit detects the signal output from the voltage drop detecting means, the data of the air conditioning operation integrated time is written in the nonvolatile memory, so that the power supply such as a power failure is interrupted. Even if a non-volatile memory is used so that the data of the accumulated air-conditioning operation time can be saved, the air-conditioning operation is stored in the non-volatile memory. By reducing the number of times of writing data of computation time, it exhibits the excellent effect that never would shorten the life of the nonvolatile memory.

[Brief description of drawings]

FIG. 1 is a control flowchart showing a first embodiment of the present invention.

FIG. 2 System block diagram

FIG. 3 is a characteristic diagram of a DC power supply unit

FIG. 4 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 5 is a view corresponding to FIG.

[Description of Reference Signs] Reference numeral 3 is a DC power supply section, 4 is a control unit, 5 is a voltage drop detecting means, 6 is a control unit reset circuit section, 7 is a non-volatile memory, 8 is an operating section, 9 and 13 are display means, 12 Is an air conditioning control unit, 14 is a fan motor, and 15 is a drive circuit.

Claims (2)

[Claims] 1. A DC power supply unit connected to an AC power supply unit for converting into an AC voltage DC voltage from the AC power supply unit, a control unit connected to the DC power supply unit and having a microcomputer, and this control unit. And a DC power supply unit, which detects the output voltage from the DC power supply unit being below a certain level and outputs a signal to the control unit, the control unit and the DC power supply unit. And a control unit reset circuit section that outputs a signal for starting the operation of the control unit when the voltage supplied from the DC power supply section to the control unit reaches a voltage that can operate the control unit. Display means for confirming the operating state of the control unit, an operation section for connecting to the control unit to set the operation of the control unit, and the control unit. Equipped with a non-volatile memory that can be connected to the control unit and can write and read data
A microcomputer control device, wherein data is written in the nonvolatile memory when the control unit detects a signal output from the voltage drop detecting means. 2. In an air conditioner equipped with a replaceable air filter, a DC power supply unit for connecting to an AC power supply unit and converting the AC voltage from the AC power supply unit into a DC voltage, and to the DC power supply unit. In addition, an air conditioning control unit having a microcomputer, and detecting that the output voltage from the DC power supply unit, which is provided between the air conditioning control unit and the DC power supply unit, falls below a certain level and controls the signal A voltage drop detecting means for outputting to the unit,
The air conditioning control unit is started when the voltage provided between the air conditioning control unit and the DC power supply unit and supplied from the DC power supply unit to the air conditioning control unit becomes a voltage that can operate the air conditioning control unit. Control unit reset circuit section for outputting a signal for controlling the air conditioning control unit, display means for confirming the operation state of the air conditioning control unit, an operation section for connecting the air conditioning control unit to set the operation of the air conditioning control unit, and the air conditioning control A non-volatile memory that is connected to the unit and is capable of writing and reading data of the air conditioning operation integrated time, and the air conditioning control unit, when the air conditioning operation integrated time reaches a predetermined time, the display means displays the air filter The air-conditioning control unit detects the signal output from the voltage drop detecting means while displaying that it is the time to replace. The air conditioning apparatus, characterized in that the non-volatile memory write data of the air conditioning operation integrated time when.