JP2765409B2 - Control device and control method for air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inverter device for controlling a compressor induction motor of an air conditioner at a variable speed, and an electric eraser for storing various data such as frequency, temperature, and current for controlling the air conditioner. The present invention relates to a control device for an air conditioner having an inverter control unit having a writable nonvolatile memory.

[0002]

2. Description of the Related Art FIG. 9 is a block diagram showing a conventional control device for an air conditioner disclosed in, for example, Japanese Patent Laid-Open Publication No. 4-62351. In FIG. Is a converter unit, 4 is an inverter unit, 5 is a compressor, 6 is a microcomputer, 7 is a non-volatile memory, 8 is a DC / D
C conversion, 9 is a control circuit power generation, 10 is a power transistor drive circuit, 11 is a relay driver, 12 is a relay,
13 is a fan motor and 14 is a solenoid valve.

Next, the operation of the conventional technique will be described.
An operation command signal for controlling the operation of the outdoor unit is transmitted from the indoor unit to the outdoor control unit 1 in the form of an AC power supply 2 and a serial signal (not shown). The AC power supply 2 enters the converter section 3 and is converted into a DC power supply. The AC power supply 2 is connected to an inverter section 4 composed of a power transistor module, and is connected to a three-phase connection of a compressor 5. The operation command signal based on the serial signal from the indoor unit starts the microcomputer 6 and preliminarily sets the mask ROM or RA
In accordance with the control condition stored in M, a signal waveform to the inverter unit 4 is generated and supplied to the power transistor drive circuit 10, and the operation of the compressor 5 is controlled steplessly by controlling the power transistor of the inverter unit 4. ing.

[0004] A nonvolatile memory 7 is connected to the microcomputer 6, and reads and stores control conditions from the inspection jig via the microcomputer 6 by a special serial signal at the time of product completion inspection. When the power is turned off in the normal operation state, the control conditions written in the RAM disappear, but the nonvolatile memory 7
Is stored as it is, is called from the non-volatile memory 7 at the time of restart, and is written in the RAM, so that the operation state of the compressor 5 can be continued without manually inputting a new control condition. it can.

Also, by writing signals from various sensors from the RAM of the microcomputer 6 to the nonvolatile memory 7 in a time series and storing the signals, the failure state is stored in the nonvolatile memory 7 even when the power is turned off due to the occurrence of a failure. By pursuing the cause of the failure, it is possible to prevent recurrence and improve the efficiency of the repair work.

[0006]

The control device of the conventional air conditioner is configured as described above. However, when the power is cut off or the user forcibly turns off the power while the air conditioner is operating,
Before that, since the compressor induction motor, fan motor, solenoid valve, etc. were driven by the control circuit, the discharge time of the power supply was short, and all the large data such as frequency, current, temperature, etc. for controlling the air conditioner was collected. There was a problem that writing could not be performed, and the next time the air conditioner was operated, it could not be operated or operated with different data.

[0007] When various tests are performed to detect a manufacturing defect and a component defect at the time of assembling the inverter control device, various data such as temperature and current at the time of operating the air conditioner are written. Some problems occurred in the market, and even if the data in the nonvolatile memory was examined, the true value could not be grasped, and there was a problem that it hindered the elucidation of the cause.

[0008] If the air conditioner has any problem in the market, it is not known how the air conditioner was used before and how much the compressor was operating.
Even if a measure is taken for the failure, the true cause cannot be grasped and the failure recurs.

When reading various information and data written in the nonvolatile memory, the read data is not a regular value due to the influence of noise or the like entering from the power supply of the air conditioner, and the air conditioner is operated. In such a case, there is a problem that the operation using different data or the inability to perform the operation is performed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and when the air conditioner is stopped, the air conditioner and the inverter device can reliably perform the frequency, temperature, and temperature control under any load conditions. It is an object of the present invention to provide a control device for an air conditioner which stores various data such as current in a nonvolatile memory and can smoothly control the next operation of the air conditioner.

It is another object of the present invention to provide a method of controlling an air conditioner which does not include unnecessary information written in a nonvolatile memory at the stage of assembling the air conditioner and can obtain only data in the market.

Further, there is provided an air conditioner control device capable of accurately reading data from a nonvolatile memory even when there is noise or the like entering from a power supply of the air conditioner and smoothly controlling the air conditioner. It is intended to be.

[0013]

A control device for an air conditioner according to the present invention controls voltage of a circuit power supply of an inverter control unit, and controls the air conditioner based on a result of the voltage detection device. Load reducing means for stopping the drive signals of the compressor induction motor, fan motor, solenoid valve, etc., and writing various data such as temperature and current before the air conditioner is stopped to the non-volatile memory after execution of the load reducing means. Means.

[0014] A method for controlling an air conditioner according to the present invention includes:
When assembling the air conditioner, read the operation command from outside,
Starting the operation of the compressor in accordance with the command, reading the detection values of various sensors and performing overall control, determining the abnormality of the various sensors, and, if determined to be abnormal, the abnormal state Writing to the non-volatile memory, determining whether the operation command is the normal mode or the test mode, and in the case of the test mode,
Clearing the abnormal state written in the nonvolatile memory.

Also, at the time of assembling the air conditioner, a step of reading an operation command from the outside and starting operation of the compressor in accordance with the command; a step of reading detection values of various sensors to perform overall control; Performing an abnormality determination of the above, a step of determining whether the operation command is a normal mode or a test mode when it is determined to be abnormal, and writing the abnormal state to the non-volatile memory if the normal mode is determined. Steps and, in test mode,
And writing nothing to the non-volatile memory.

Further, the control device for an air conditioner according to the present invention stores the initial data in an electrically erasable and writable nonvolatile memory for storing various data such as frequency, temperature and current for controlling the air conditioner. Initial storage means for writing the sum value and the added value; first arithmetic means for summing and adding the read values when the microcomputer of the inverter control unit reads data from the nonvolatile memory during operation of the air conditioner; Comparing means for comparing the data in the storage means with the data in the first arithmetic means; means for storing the data as regular data in the microcomputer if the data match based on the result of the comparing means; The second arithmetic means for reading the data of the nonvolatile memory again by the number of times and executing the first arithmetic means; If no is provided with a means for stopping the air conditioner.

[0017]

An air conditioner control device according to the present invention detects a voltage of a circuit power supply of an inverter control unit, and controls a drive signal of a compressor induction motor, a fan motor, a solenoid valve, etc. for controlling the air conditioner based on the detection result. Is stopped to reduce the load on the power supply circuit, and after the load is reduced, the nonvolatile memory is controlled to write various data such as temperature and current before the air conditioner was stopped.

According to the air conditioner control method of the present invention, abnormal states of various sensors are written in a nonvolatile memory, and when the operation command is in a test mode, the abnormal states written in the nonvolatile memory are cleared. Control.

When it is determined that the various sensors are abnormal, it is determined whether the operation command is a normal mode or a test mode.
When it is determined that the normal mode is set, the abnormal state is written to the non-volatile memory, and in the test mode, control is performed so that nothing is written to the non-volatile memory.

Further, the air conditioner control device according to the present invention provides a method of controlling the air conditioner by summing up initial data in an electrically erasable and writable nonvolatile memory for storing various data such as frequency, temperature, and current. Write the value and the sum,
When the microcomputer of the inverter control unit reads the data of the non-volatile memory during the operation of the air conditioner, sums the read values, performs addition, compares the data of the non-volatile memory with the data of the operation result, and compares the result of the comparison. If the data match, the data is stored in the microcomputer as regular data. If the data does not match, the data in the nonvolatile memory is read again at an arbitrarily set number of times, and the above calculation is performed. If the data does not match after execution, control is performed to stop the air conditioner.

[0021]

[Embodiment 1] Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a block diagram showing a control device for an air conditioner according to the present invention. In the figure, an AC power supply 2 enters a converter unit 3 and is converted into a DC power supply, is connected to an inverter unit 4 composed of a power transistor module, and is connected to a three-phase connection of a compressor 5. An outdoor control unit 1 includes a microcomputer 6, a nonvolatile memory 7, a DC / DC conversion circuit 8, a control circuit power supply generation circuit 9, a power transistor drive circuit 10, a relay driver 11, and a relay 12, and newly includes a power supply. A voltage monitoring circuit 15 has been added. Here, the outdoor control unit 1
The power of each circuit block is supplied by lowering the DC power of the converter unit 3 by the DC / DC conversion circuit 8 and further converting the DC power of the converter unit 3 to 5 V by the control circuit power generation circuit 9.

An operation command signal for controlling the operation of the outdoor unit is sent from the indoor unit to the outdoor control unit 1 in the form of an AC power supply 2 and a serial signal (not shown). An operation command signal based on a serial signal from the indoor unit is input to the microcomputer 6, generates a signal waveform to the inverter unit 4 according to the control conditions stored in the mask ROM or the RAM in advance, and supplies the signal waveform to the power transistor driving circuit 10. The operation of the compressor 5 is steplessly controlled by controlling the power transistor of the inverter unit 4. A fan motor 13 and an electromagnetic valve 14 are connected to the relay 12 via a relay driver 11 and are driven by a control command from the microcomputer 6.

A non-volatile memory 7 is connected to the microcomputer 6, and when the power is turned off in a normal operation state, the control conditions written in the RAM are erased.
Is stored as it is, is called from the non-volatile memory 7 at the time of restart, and is written in the RAM, so that the operation state of the compressor 5 can be continued without manually inputting a new control condition. it can.
The power supply voltage monitoring circuit 15 is connected to the input of the control circuit power supply generation circuit 9 (the output of the DC / DC conversion circuit 8), monitors the input voltage of the control circuit power supply generation circuit 9, detects a voltage drop, and outputs it to the microcomputer 6. I do. The microcomputer 6 receives the voltage drop detection signal and outputs a signal waveform to the inverter unit 4 and cuts off drive signals for the fan motor 13 and the solenoid valve 14.

Hereinafter, this operation will be described in detail with reference to the timing chart of FIG. In the figure, waveform A is DC / D
The output of the C conversion circuit 8, that is, the control circuit power generation circuit 9
, The waveform B represents the output of the control circuit power generation circuit 9, that is, the power supply voltage waveform of the microcomputer 6 and the nonvolatile memory 7, the waveform C represents the output waveform of the power supply voltage monitoring circuit 15, and the waveform D represents the compressor 5. , Fan motor 13 and solenoid valve 14, waveforms E and F indicate control signals of nonvolatile memory 7 output from microcomputer 6, waveform E indicates a write enable signal, waveform F indicates write data or write clock signal. It is. FIG. 2 shows the operation of each unit when the AC power supply 2 is not supplied, that is, when the power supply to the DC / DC conversion circuit 8 is stopped.

Now, when the input of the control circuit power supply generation circuit 9 is V0 and the supply of the AC power supply 2 is stopped at the timing of t0, the voltage starts decreasing as shown in the figure. Then, at the point in time when the voltage drops to V1: at time t1, the power supply voltage monitoring circuit 15 operates, and outputs a power supply voltage drop detection signal: waveform C to the microcomputer 6. In response to this, the microcomputer 6 stops the signal output to the inverter unit 4 and the control signal output to the fan and the solenoid valve as shown by the waveform D. As a result, the operation of the power transistor drive circuit 10 stops, the operation of the compressor 5 stops via the power transistor of the inverter unit 4, and the fan motor 13 and the solenoid valve 14 turn off via the relay driver 11. . Then, microcomputer 6
A write enable signal: waveform E is output to write the AM data to the nonvolatile memory 7 to make the nonvolatile memory accessible, and various data such as frequency, temperature, and current are actually written: waveform F. Therefore, at the point in time when the input voltage of the control circuit power generation circuit 9 drops to V1: t1, the signal waveform output to the inverter unit 4 and the drive signals of the fan motor 13 and the solenoid valve 14 are cut off, and further, the nonvolatile memory is Data writing will be performed continuously.

If the signal output to the inverter unit 4 and the signal output to the fan motor 13 and the solenoid valve 14 are not stopped at the time t1 in FIG. 2, the input of the control circuit power generation circuit 9 is indicated by a dotted line in FIG. As shown, the power supply voltage drops on the extension from t0 to t1. Then, the output voltage of the control circuit power generation circuit 9 drops to a voltage value: V2 at which the output voltage of the control circuit power generation circuit 9 cannot be maintained at 5 V, and the output of the control circuit power generation circuit 9 starts to decrease. Here, the timing of dropping to V2 is t2. Similarly, when the signal output to the inverter unit 4 and the signal output to the fan motor 13 and the solenoid valve 14 are stopped at the time t1, the input of the control circuit power generation circuit 9 becomes t0 as shown by a solid line in the drawing. , The power supply voltage drops more gently than the extension of t1. Then, the output voltage of the control circuit power generation circuit 9 decreases to a voltage value: V2 at which 5 V cannot be maintained,
At the timing of t3, the output of the control circuit power generation circuit 9 starts to decrease.

As described above, when the input voltage of the control circuit power generation circuit 9 is monitored and the signal output to the inverter section 4 and the signal output to the fan motor 13 and the solenoid valve 14 are stopped, the control circuit power generation circuit The input of 9 drops slowly,
The voltage value at which the output voltage of the control circuit power generation circuit 9 cannot maintain 5 V: the time required to decrease to V2 can be extended from t2 to t3. As a result, the writable time of the nonvolatile memory 7 can be increased from t2-t1 It is possible to extend the time from t3 to t1.

Embodiment 2 FIG. Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG.
, The commercial power supply 2 is rectified and smoothed by the converter unit 3 and converted into a DC power supply.
, And the compressor 5 is driven by the output of the inverter unit 4. Reference numeral 23 denotes a current sensor that detects a current flowing into the converter unit 3, reference numeral 25 denotes an overcurrent detection sensor that detects an overcurrent of the current flowing into the inverter unit 4, and reference numeral 21 denotes a temperature sensor that detects the temperature of each unit. is there. A signal interface circuit 20 has a function of receiving a signal from the outside and a function of transmitting a signal from the microcomputer 6 to the outside. A signal from the sensor;
The signal of the signal interface circuit 20 is input to the microcomputer 6 and various processes are performed by the microcomputer 6 to control the operation of the outdoor unit. The microcomputer 6 analyzes signals from the various sensors to determine an abnormal state or the like. This abnormal state is written to the nonvolatile memory 7 connected to the microcomputer 6,
Even if the power is turned off, the abnormal state can be stored and held. The outdoor control unit 1 is configured as described above, and controls the outdoor unit of the split type air conditioner.

Next, the operation will be described. Microcomputer 6
Is an external operation command received by the signal interface circuit 20, a current sensor 23, an overcurrent sensor 25,
The operation of the compressor 5 is controlled by each sensor output of the temperature sensor 21. When the microcomputer 6 detects an abnormality of various sensors, the microcomputer 5 stops the operation of the compressor 5 and stores the abnormal state in a nonvolatile memory 7 connected to the microcomputer 6 to protect the product. The abnormal state stored in the nonvolatile memory 7 is configured to be readable by a special external signal. In the inspection stage at the time of completion of such a product, it is usual that a test is performed to check whether the abnormality detection of the various sensors described above operates normally, and the product is shipped after confirming the operation. In addition, at the time of shipping inspection, it is common to operate the product in a special test mode instead of the normal mode and check each part in order to improve the inspection efficiency.

Next, the operation will be described with reference to the flowchart of FIG. First, in step 100, an external operation command is read, and the operation of the compressor 5 is started according to the command. Then, the detected values of the various sensors are read in step 101, and the whole control is performed in step 102. Then, in step 103, abnormality determination of various sensors is performed,
If it is determined in step 103 that there is an abnormality, step 1
In step 04, the abnormal state is written in the nonvolatile memory 7, and the process proceeds to step 105. If it is determined in step 103 that the operation is normal, the flow directly proceeds to step 105 to determine whether the operation command is the normal mode or the test mode. Step 10
In the case of the test mode in step 5, the process proceeds to step 106,
Clear the abnormal state written to the nonvolatile memory 7,
Return to step 100. If it is determined in step 105 that the mode is the normal mode, the process returns to step 100 as it is. By operating as described above, the abnormal information written in the nonvolatile memory 7 at the time of the product inspection test is reliably cleared, and the product can be shipped.

Embodiment 3 FIG. Further, in the above embodiment, when an abnormality occurs, the abnormality information is once written in the non-volatile memory 7, and then the test mode is determined and the abnormality information is cleared. A similar effect can be obtained by a method of skipping writing of abnormal information. The operation will be described below with reference to the flowchart of FIG. First, at step 200, an external operation command is read, and the operation of the compressor 5 is started according to the command. Then, in Step 201, the detection values of various sensors are read, and in Step 20
2. The overall control is performed. Then, in step 203, abnormality determination of various sensors is performed. If it is determined in step 203 that abnormality has occurred, the process proceeds to step 204, and it is determined whether the operation command is the normal mode or the test mode. In the case of the test mode in step 204, the process returns to step 200 without writing anything in the nonvolatile memory 7. If it is determined in step 204 that the operation mode is the normal mode, the process proceeds to step 205, where the abnormal state is written to the nonvolatile memory 7 and step 20 is executed.
Return to 0.

Embodiment 4 FIG. FIG. 6 is a flowchart illustrating the operation of the fourth embodiment, which will be described. AC power supply 2 is turned on and DC / DC
The conversion circuit 8 and the control circuit power generation circuit 9 operate, and when power is supplied to the outdoor control unit 1, the microcomputer 6 operates and the processing of FIG. 6 is executed. In step 601, the integrated data of the compressor is read from the non-volatile memory 7, and in step 602
To store in the integration counter set in the RAM of the microcomputer 6. Here, when the power is turned on for the first time, zero is read. Next, if the compressor 5 is in the operating state in step 603, step 604 is executed, and in step 602, RA
The integration counter set to M is added. Step 604 is not executed while the operation is stopped. When a write request to the non-volatile memory 7 occurs due to a drop in power supply voltage or the like as in the first embodiment, in step 606, the integrated counter value set in the RAM is written to a predetermined area in the non-volatile memory. The area in the nonvolatile memory 7 to be written in step 606 is the area read in step 601. When the power is turned on next time, the processing in FIG. 6 is executed again, and the data written in step 606 is read out. The operation time of the compressor 5 is integrated and stored in the nonvolatile memory 7.

Embodiment 5 FIG. Hereinafter, a fifth embodiment of the present invention will be described with reference to the drawings. FIG.
, A microcomputer 6 is connected to a nonvolatile memory 7 in which control conditions and control data are stored, and the data in the nonvolatile memory 7 is stored in a readout circuit 6 of the microcomputer 6.
3 and input to the readable / writable memory 7 and stored. The data read by the read circuit 63 is also input to an adder 64, and the adder 64
Then, the sum of the read data is calculated. Comparator 6
5, the sum of the data of the adder 63 and the nonvolatile memory 7
Is compared with the data indicating the sum of the data stored in.

Next, the operation will be described. As shown in Table 1, data and control conditions necessary for controlling the microcomputer 6 are stored in the nonvolatile memory 7 as data 1 to data 5. The next address stores the lower 8 bits of the sum of data 1 to data 5 as collation data from data 1 to data 5.

[0035]

[Table 1]

Next, the operation will be described with reference to the flowchart of FIG. In step 101, the addition counter is initially cleared, and in step 102, one byte of data in the nonvolatile memory 7 is read. Then, the data read in step 103 is added to the value of the addition counter, and the lower 8 bits are stored in the addition counter. And step 104
In step 103, the process returns to step 102 to read the data of the next address from the non-volatile memory 7, adds the data read to the addition counter in step 103, and adds the lower 8 The bit is stored in the addition counter. Then, in step 104, the completion of reading is checked, and the required number of data is read. Then, the process proceeds to step 105, where the collation data is read from the non-volatile memory, and
06, the value of the addition counter and the value of step 105
Is compared with the data for collation read out by. Since the data for collation is calculated in advance by the same method as the above calculation method, if there is no problem at the time of reading the data in step 102, it always matches the addition result of the addition counter 64. If no match is found in the comparison in step 106, noise or the like is mixed during reading, it is determined that reading was not performed normally, and the process proceeds to step 107, where error processing is performed, an error is displayed, and control is stopped. If the two data match in step 106, it is determined that the data has been read normally, and the flow advances to step 108 to perform normal control based on the data read from the nonvolatile memory 7.

Embodiment 6 FIG. Further, in the above embodiment, the lower 8 bits of the sum are used as the collation data. However, other methods such as a method using a 2's complement value for the sum or a sum of each bit of data 1 to data 5 are used. However, it goes without saying that the same effect as in the above embodiment can be obtained.

Embodiment 7 FIG. Further, in the above embodiment, when the comparison result does not match, an error display is performed as an error process and the control is stopped. However, control data and control conditions in the case of an error are stored in the read-only memory of the microcomputer 6 in advance. When an error occurs, error recovery may be performed so that subsequent control is performed using data stored in the read-only memory of the microcomputer 6.

[0039]

The control device for an air conditioner according to the present invention comprises a voltage detecting means for detecting a voltage of a circuit power supply of an inverter control unit, and a compressor induction motor for controlling the air conditioner based on a result of the voltage detecting means. , A load reducing means for stopping a drive signal of a fan motor, an electromagnetic valve or the like, and a means for writing various data such as temperature and current before the air conditioner is stopped in the nonvolatile memory after execution of the load reducing means. Therefore, when the air conditioner stops, the air conditioner and the inverter device ensure the frequency,
Various data such as temperature and current are stored in the non-volatile memory, so that they can be smoothly controlled at the next operation of the air conditioner, and can be constructed at low cost without using expensive parts with high writing speed.

According to the control method of the air conditioner of the present invention, when assembling the air conditioner, various sensors are determined to be abnormal. In the case of (1), since the abnormal state written in the non-volatile memory is cleared, unnecessary information written in the non-volatile memory in the air conditioner assembly stage is not included, and there is an effect that only data in the market can be obtained. .

When various sensors are determined to be abnormal when assembling the air conditioner, it is determined whether the operation command is a normal mode or a test mode.
The abnormal state is written to the non-volatile memory, and in the test mode, control is performed so that nothing is written to the non-volatile memory, so that unnecessary information written to the non-volatile memory during the air conditioner assembly stage is not included. This has the effect that only data in the market can be obtained.

Further, the control device for an air conditioner according to the present invention is a device for summing up initial data in an electrically erasable and writable nonvolatile memory for storing various data such as frequency, temperature and current for controlling the air conditioner. Initial storage means for writing a value and an added value; first arithmetic means for summing and adding the read values when the microcomputer of the inverter control unit reads data from the non-volatile memory during operation of the air conditioner; Comparing means for comparing the data of the means with the data of the first calculating means; means for storing in the microcomputer as normal data if the data match based on the result of the comparing means; The second arithmetic means for reading the data of the non-volatile memory again and executing the first arithmetic means and the data after execution of the second arithmetic means match. In this case, the air conditioner is provided with means for stopping the air conditioner, so that data can be accurately read from the non-volatile memory even when there is noise or the like entering from the power supply of the air conditioner, and the air conditioner can be smoothly operated. There is an effect that can be controlled.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram illustrating a configuration of a control device for an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a timing chart illustrating an operation of the control device for the air conditioner according to the first embodiment of the present invention.

FIG. 3 is a circuit block diagram illustrating a configuration of a control device for an air conditioner according to a second embodiment of the present invention.

FIG. 4 is a flowchart illustrating the operation of a control device for an air conditioner according to a second embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation of a control device for an air conditioner according to Embodiment 3 of the present invention.

FIG. 6 is a flowchart illustrating an operation of a control device for an air conditioner according to a fourth embodiment of the present invention.

FIG. 7 is a circuit block diagram illustrating a configuration of a control device for an air conditioner according to a fifth embodiment of the present invention.

FIG. 8 is a flowchart illustrating the operation of a control device for an air conditioner according to Embodiment 5 of the present invention.

FIG. 9 is a circuit block diagram illustrating a configuration of a conventional air conditioner control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outdoor control part 2 AC power supply 3 Converter part 4 Inverter part 5 Compressor 6 Microcomputer 7 Nonvolatile memory 8 DC / DC conversion circuit 9 Control circuit power generation circuit 10 Power transistor drive circuit 11 Relay driver 12 Relay 13 Fan motor 14 Solenoid valve Reference Signs List 15 power supply voltage monitoring circuit 20 signal interface circuit 21 temperature sensor 23 current sensor 25 overcurrent detection sensor 63 readout circuit 64 adder 65 comparator

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroaki Suzuki 3-181, Oka, Shizuoka-shi Mitsubishi Electric Engineering Co., Ltd. Nagoya Office Shizuoka Branch (72) Inventor Takahiro Ishigami 3-18, Oka, Shizuoka-shi No. 1 Mitsubishi Electric Engineering Co., Ltd. Nagoya Office Shizuoka Branch (56) References JP-A-1-174848 (JP, A) JP-A-1-114999 (JP, A) JP-A-64-38542 (JP) , A) (58) Field surveyed (Int.Cl. ⁶ , DB name) F24F 11/02

Claims (4)

(57) [Claims] 1. A converter for converting an inputted commercial AC power into DC, an inverter for converting the DC again into an AC having an arbitrary frequency, and a variable frequency converter from the inverter to a compressor induction motor of an air conditioner. And an inverter control unit having a microcomputer that generates and outputs a signal of an arbitrary frequency voltage to the inverter unit. The inverter control unit controls the frequency, temperature, current, etc., for controlling the air conditioner. In an air conditioner control device having an electrically erasable and writable nonvolatile memory for storing various types of data, a voltage detection unit for detecting a voltage of a circuit power supply of the inverter control unit, and a voltage detection unit based on a result of the voltage detection unit Load reduction means for stopping drive signals for compressor induction motors, fan motors, solenoid valves, etc. that control air conditioners And a means for writing various data such as temperature and current before stopping the air conditioner in the nonvolatile memory after execution of the load reducing means. 2. At the time of assembling the air conditioner, a step of reading an operation command from the outside and starting operation of the compressor in accordance with the command; a step of reading detection values of various sensors to perform overall control; A step of determining whether the sensor is abnormal; a step of writing the abnormal state to the non-volatile memory if it is determined that the sensor is abnormal; a step of determining whether the operation command is the normal mode or the test mode; Clearing the abnormal state written in the non-volatile memory; and controlling the air conditioner. 3. An external operation finger when assembling the air conditioner.
And start the compressor operation according to the command
Steps and steps for reading the detection values of various sensors and performing overall control
And-up, and performing an abnormality determination of the various sensors, if it is determined to be abnormal, the operation command or the normal mode
A step of determining whether the mode is the test mode ;
Writing to the volatile memory, and in the case of the test mode, nothing is stored in the nonvolatile memory.
A method for controlling an air conditioner , comprising: a step of not writing . 4. An air conditioner for assembling the inverter control device.
Various data such as frequency, temperature, and current for controlling the Japanese machine
First in non-volatile memory that can erase and write data
Initial storage means for writing the sum of the period data and the added value;
The microcomputer of the inverter control unit is an air conditioner
Read when reading data from non-volatile memory during operation.
A first calculating means for summing and adding the read values;
Comparing the data of the period storage means with the data of the first arithmetic means
Data matches based on the result of the comparing means and the comparing means
If the data is
The means for storing and in case of inconsistency, again
Reading the data from the nonvolatile memory;
And second data after the execution of the second arithmetic means
Means for stopping the air conditioner if the values do not match.
A control device for an air conditioner, comprising: