KR100239531B1 - Compressor controller and method for air conditioner - Google Patents

Abstract

The present invention relates to a compressor control apparatus and a method of an air conditioner, the air conditioner comprising a compressor for operating in accordance with the operating frequency calculated by using a purge table, the indoor temperature sensing means for sensing the indoor temperature; Control means for calculating the starting frequency of the compressor in accordance with the difference between the room temperature and the set temperature detected by the room temperature sensing means, and inverter means for starting the compressor in accordance with the starting frequency calculated by the control means, In heating operation, set the starting frequency higher than in the cooling operation to shorten the time difference when the room temperature reaches the set temperature, and improve the haptic efficiency by starting the compressor at the set starting frequency even when restarting the compressor during the operation of the air conditioner. .

Description

Compressor controller and method for air conditioner

The present invention relates to an inverter air conditioner for driving a compressor by varying a frequency, and more particularly, to a compressor control apparatus and a method of an air conditioner which increases a starting frequency of a compressor during heating and shortens a time difference at which an indoor temperature reaches a set temperature. It is about.

In general, the conventional air conditioner, as shown in Fig. 1, the converter unit 3 for converting the AC input power supplied from the AC power source stage 1 to the DC power, and the DC converted in the converter unit 3 A power supply unit 5 for receiving power and converting it into a predetermined DC voltage required for driving the air conditioner (the microcomputer driving power supply of DC 5V and the load driving power supply of DC 12V) and the DC power output from the power supply unit 5; The controller 7 not only initializes the air conditioner by applying a voltage, but also determines an operating frequency of the compressor 11 according to outdoor conditions and instructions of an indoor unit, and outputs an inverter driving signal, and the operation determined by the controller 7. Inverter driver 9 for amplifying the PWM signal output from the controller 7 to the inverter drive signal to rotate the compressor 11 in accordance with the frequency, and in accordance with the drive signal output from the inverter driver 9 6 And an inverter unit 11 that alternately turns on or off the power-transistor of the converter to convert the DC power output from the converter unit 3 into three-phase (u-phase, v-phase, w-phase) AC power. have.

In the air conditioner for both heating and cooling as configured above, when the AC input power is supplied, the AC input power is converted into the DC power in the converter unit 3, and the converted DC power is input to the power supply unit 5 to provide air conditioning. It is converted into a microcomputer driving power supply of DC 5V and a load driving power supply of DC 12V necessary for driving of the machine, and is supplied to the control unit 7 and the inverter driving unit 9.

Therefore, the control unit 7 receives the DC voltage (microcomputer drive power) output from the power supply unit 5 to initialize the air conditioner.

At this time, the user operates the key operation unit provided on the control panel of the remote controller or the indoor unit to input the desired operation mode and the set temperature Ts, and then turns on the operation key, the control unit 7 detects the room temperature Tr. According to the result, it is determined whether it is cooling operation or heating operation, and regardless of cooling or heating operation, E [N] × 10 + 30 [Hz]. The compressor 13 is started at the starting frequency set by the formula (1).

When cooling, E [N] = (Tr [N] +0) -Ts [N]... (2)

When heating, E [N] = (Ts [N] +3) -Tr [N]. (3)

After starting the compressor 13, the control unit 7 calculates the operating frequency of the compressor 13 according to the difference between the set temperature Ts and the room temperature Tr as follows.

f [N] = f [N-1] + Δf... (4) ; f [N] is the operating frequency of the compressor at time N

Δf = purge (E [N], ΔE)... (5); Fuzzy (A, B) is the value of fuzzy table determined by input variables A, B

ΔE = E [N] -E [N-1]... (6)

[N]-[N-1] = 40 seconds.

First, the E [N] value is obtained by substituting the set temperature (Ts) and the room temperature (Tr) in the above formulas (2) and (3) according to the operation mode (cooling or heating) of the air conditioner. Substituting the value of [N] and ΔE into Eq. (5) above, a new Δf value is obtained using the fuzzy table at 40-second intervals, and the value of Δf is replaced by Equation (4) above. Calculate the operating frequency f [N] of 13).

Accordingly, when the controller 7 outputs the inverter driving PWN signal to the inverter driver 9 according to the calculated driving frequency f {N], the inverter driver 9 is output from the controller 7. By amplifying the PWN signal, six power-transistors (not shown) of the inverter unit 11 are alternately turned on or off to convert the DC power output from the converter unit 3 into three-phase AC power and output the inverter. The compressor 13 is driven by three-phase (u-phase, v-phase, w-phase) AC power output from (11).

That is, the inverter unit 11 supplies the compressor 13 with the operating frequency of the compressor 13 and the corresponding voltage to the compressor 13 in response to the cooling or heating capability required for the operation of the air conditioner, thereby operating the compressor 13 at the desired operating frequency. Drive it.

When the compressor 13 is driven, the refrigerant is heated at the time of heating, as shown by the dashed line (->) of FIG. 2, the compressor 13 → the four-way valve 15 → the indoor heat exchanger 17 → the expansion valve ( 19), a refrigeration cycle circulated in the order of the heating expansion valve 21, the outdoor heat exchanger 23, the four-way valve 15, and the compressor 13 is formed.

On the other hand, during cooling, as the refrigerant is shown by the solid line (→) in Fig. 2, the compressor 13 → the four-way valve 15 → the outdoor heat exchanger 23 → the one-way valve 25 → the expansion valve 19 → A freezing cycle circulated in the order of an indoor heat exchanger (17) → a four-way valve (15) → a compressor (13) is formed.

By the way, in such a conventional air conditioner, the starting frequency of the compressor 13 is set by the above E [N] × 10 + 30 [Hz] equation so that the compressor (with the same starting frequency regardless of cooling or heating operation) 13) is activated, the time difference between room temperature (Tr) reaching the set temperature (Ts) is significantly different during cooling operation and heating operation due to the difference in efficiency of cooling or heating operation, and convection of indoor air during heating operation. As a result, there is a problem that the haptic efficiency is lower than that of the cooling operation.

Accordingly, the present invention has been made to solve the above problems, in the heating operation to set a higher starting frequency than in the cooling operation to shorten the time difference that the room temperature reaches the set temperature, during the operation of the air conditioner It is an object of the present invention to provide a compressor control apparatus and a method of an air conditioner that increases the haptic efficiency since the compressor is started at a set starting frequency even when the compressor is restarted.

In order to achieve the above object, a compressor control apparatus for an air conditioner according to the present invention includes an air conditioner including a compressor for operating according to an operating frequency calculated using a purge table, the indoor temperature sensing means for sensing an indoor temperature; And control means for calculating a starting frequency of the compressor according to the difference between the room temperature and the set temperature detected by the room temperature detecting means, and inverter means for starting the compressor according to the starting frequency calculated by the control means. It is characterized by.

In addition, the compressor control method of the air conditioner according to the present invention detects the indoor temperature operation step for determining whether the heating / cooling operation, and calculating the starting frequency of the compressor in accordance with the indoor temperature and the set temperature to determine the compressor In accordance with the compressor operation step for starting the compressor, the compressor operation step for operating the compressor by calculating the operating frequency of the compressor using a calculated value using the purge table after the compressor startup in the compressor operation step, and the compressor operation in the compressor operation step A compressor control step for controlling the operation of the compressor by comparing the changing room temperature with the set temperature, and restarting the compressor by recalculating the starting frequency of the compressor according to the room temperature and the set temperature when the compressor is restarted during operation. Characterized in that the compressor restart step.

1 is a compressor control block diagram of a conventional air conditioner.

2 is a cooling / heating cycle diagram of a general air conditioner.

3 is a control block diagram of a compressor control apparatus of an air conditioner according to an embodiment of the present invention.

4 is a driving circuit diagram of a compressor applied to the present invention.

5A and 5B are flowcharts showing the operation procedure of the compressor control of the air conditioner according to the present invention.

<Explanation of symbols for main parts of drawing>

30: converter means 35: power supply means

40: control means 45: inverter driving means

50: inverter means 55: room temperature detection means

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figs. 3 and 4, the converter means 30 rectifies and smoothes the AC input power supplied from the AC power supply stage 1 to convert it into DC power, and the power supply means 35 converts the converter means 30. Is a SMPS (Switching Mode Power Supply) which converts and outputs a DC power converted by the &lt; RTI ID = 0.0 &gt; 1) &lt; / RTI &gt;

The control means 40 not only initializes the air conditioner by receiving the DC voltage output from the power supply means 20, but also sets the operating frequency of the compressor 31 according to the difference between the room temperature Tr and the set temperature Ts. It is determined to output a PWM signal for driving the inverter, the inverter driving means 45 is output from the control means 40 to rotate the compressor 31 in accordance with the operating frequency determined by the control means 40 This is a power-transistor driver circuit (PTR DRIVER) that amplifies the PWM signals PWM1 to PWMM6 into inverter drive signals.

In addition, the inverter means 50 alternately turns on or turns off the six power transistors TR1 to TR6 according to a drive signal output from the inverter driving means 45 and is output from the converter means 30. The DC power is converted into a three-phase (u-phase, v-phase, w-phase) AC power having a variable frequency and a variable voltage corresponding to the operating frequency of the compressor 31, and outputted to the compressor 31, and the indoor temperature sensing means ( 55 is a temperature sensor for detecting the indoor temperature at the start of the compressor (31).

Hereinafter, the effect of the compressor control apparatus and method of the air conditioner configured as described above will be described.

5A and 5B are flowcharts showing the operation procedure of the compressor control of the air conditioner according to the present invention. In Figs. 5A and 5B, S denotes a step.

First, when power is applied to the air conditioner, the AC input power supplied from the AC power source 1 is rectified and smoothed by the converter means 30 to convert into DC power, and the DC power converted by the converter means 30. Is converted into a microcomputer driving power supply of DC 5V and DC 12V load driving power required for driving the air conditioner and outputted to the control means 40 and the inverter driving means 45.

Therefore, in step S1, a DC voltage (microcomputer drive power source) output from the power source means 35 is received from the control means 40 to initialize the air conditioner.

At this time, in step S2, the user operates the key input unit provided on the control panel of the remote controller or the indoor unit, inputs the desired operation mode and the set temperature Ts, and turns on the operation key. When the operation signal is not input (NO), the operation of step S3 or less is repeatedly performed while maintaining the air conditioner in the operation standby state.

As a result of the discrimination in step S3, when the operation signal is input (YES), the process proceeds to step S4 and the room temperature Tr is sensed by the room temperature sensing means 55.

Accordingly, in step S5, the control means 40 determines whether the air conditioner is the heating operation according to the detection result of the room temperature Tr sensed by the indoor temperature detecting means 55, and is the heating operation (YES). In this case), the control means 40 proceeds to step S6 and the control means 40 sets E [N], which is the difference between {the set temperature Ts + 3} and the room temperature Tr, E [N] = (Ts [N] +3). -Tr [N]... Obtained by Eq. (3), this E [N] value is substituted into Eq. (7) below to calculate the starting frequency during heating operation, and then the compressor 31 is started at the calculated starting frequency.

Starting frequency during heating operation = E [N] × (greater than 10) + 30 [Hz]. (7)

When the compressor 31 is started, at step S7, the refrigerant is refrigerant 13 → four-way valve 15 → indoor heat exchanger 17 → expansion valve as shown by the dotted line (->) in FIG. 19) → Heating expansion valve 21, an outdoor heat exchanger 23, a four-way valve 15, a compressor 13, and a refrigeration cycle are circulated in order to perform heating operation.

Subsequently, in step S8, the control means 40 calculates the operating frequency f [N] of the compressor 31 in accordance with the difference between the set temperature Ts and the room temperature Tr as follows.

When heating, E [N] = (Ts [N] +3) -Tr [N]. (3)

f [N] = f [N-1] + Δf... (4) ; f [N] is the operating frequency of the compressor at time N

Δf = purge (E [N], ΔE)... (5); Fuzzy (A, B) is the value of fuzzy table determined by input variables A, B

ΔE = E [N] -E [N-1]... (6); E [N-1] value is the E [N] value 40 seconds ago

[N]-[N-1] = 40 seconds.

First, the E [N] value is obtained by substituting the set temperature (Ts) and the room temperature (Tr) in Eq. (3) according to the operation mode (heating) of the air conditioner. The value of ΔE is obtained by substituting the E [N-1] value, which is the P [E] value of pyroelectricity, into equation (6) above.

Subsequently, the E [N] value and the ΔE value are substituted into the above Equation (5) to obtain new Δf values using the fuzzy table at 40 second intervals, and the Δf value is expressed in the above Equation (4). Substitution is performed to calculate the operating frequency f [N] of the compressor 13.

Therefore, the control means 40 outputs the inverter drive PWM signal to the inverter drive means 45 to rotate the compressor 31 in accordance with the calculated operating frequency f [N].

Accordingly, the inverter driving means 45 amplifies the PWM signal output from the control means 40 to alternately turn on or turn off the six power transistors TR1 to TR6 of the inverter means 50 to convert the converter. When the DC power output from the means 30 is converted into three-phase AC power and outputted, the compressor 31 is operated by three-phase (u-phase, v-phase, w-phase) AC power output from the inverter means 50. do.

At this time, the room temperature Tr increased by the operation of the compressor 31 is sensed by the room temperature detecting means 55, and in step S9, it is determined whether the room temperature Tr is above the set temperature Ts + 5, If the room temperature Tr is not equal to or higher than the set temperature Ts + 5 (NO), the process returns to step S8 and repeats the operation of step S8 or less.

As a result of the discrimination in step S9, when the room temperature Tr is equal to or higher than the set temperature Ts + 5 (YES), the process proceeds to step S10 and the inverter means 50 is for inverter drive output from the control means 40. The compressor 31 is turned off in accordance with the PWM signal.

The indoor temperature Tr lowered by turning off the compressor 31 is sensed by the indoor temperature detecting means 55. In step S11, it is determined whether the indoor temperature Tr is equal to or lower than the set temperature Ts + 3, and the indoor If the temperature Tr is not equal to or lower than the set temperature Ts + 3 (NO), the process returns to the step S10 and repeats the operation of the step S10 or less.

As a result of the discrimination in step S11, if the room temperature Tr is equal to or lower than the set temperature Ts + 3 (YES), the process proceeds to step S12, whereby the control means 40 determines {set temperature Ts + 3} and the room. The E [N] value, which is the difference of the temperature Tr, is obtained by the following Equation (3),

E [N] + (Ts [N] +3) -Tr [N]... (3)

Substituting this E [N] value into equation (7) below, recalculate the starting frequency during heating operation.

Starting frequency during heating operation = E [N] × (greater than 10) + 30 [Hz]. (7)

The compressor 31 is started at this recalculated starting frequency, and the process returns to step S7 to repeat the operation of step S7 and below.

On the other hand, in the case of the cooling operation (NO), the determination means in step S5 proceeds to step S20, whereby the control means 40 controls E [N, which is the difference between {room temperature Tr + 0} and the set temperature Ts. ] Is the value E [N] = (Tr [N] +0) -Ts [N]. Obtained by Eq. (2), this E [N] value is substituted into Equation (1) below to calculate the starting frequency during cooling operation, and then the compressor 31 is started at the calculated starting frequency.

Starting frequency during cooling operation = E [N] × 10 + 30 [Hz]. (One)

When the compressor 31 is started, in step S21, the refrigerant is refrigerant 13 → four-way valve 15 → outdoor heat exchanger 23 → one-way valve 25, as shown by the solid line (→) in FIG. → A refrigeration cycle is circulated in order of expansion valve (19) → indoor heat exchanger (17) → four-way valve (15) → compressor (13) to perform cooling operation.

Next, in step S22, the control means 40 calculates the operating frequency f [N] of the compressor 31 in accordance with the difference between the set temperature Ts and the room temperature Tr as follows.

When cooling, E [N] = (Tr [N] +0) -Ts [N]... (2)

f [N] = f [N-1] + Δf... (4) ; f [N] is the operating frequency of the compressor at time N

Δf = purge (E [N], ΔE)... (5); Fuzzy (A, B) is the value of fuzzy table determined by input variables A, B

ΔE = E [N] -E [N-1]... (6); E [N-1] value is the E [N] value 40 seconds ago

[N]-[N-1] = 40 seconds.

First, the E [N] value is obtained by substituting the set temperature (Ts) and the room temperature (Tr) in Equation (2) according to the operation mode (cooling) of the air conditioner. The E [N-1] value, which is the pyroelectric E [N] value, is taken against Equation (6) above to obtain the ΔE value.

Subsequently, the E [N] value and the ΔE value are substituted into the above Equation (5) to obtain new Δf values using the fuzzy table at 40 second intervals, and the Δf value is expressed in the above Equation (4). Substitution is performed to calculate the operating frequency f [N] of the compressor 13.

Therefore, the control means 40 outputs the inverter drive PWM signal to the inverter drive means 45 to rotate the compressor 31 in accordance with the calculated operating frequency f [N].

Accordingly, the inverter driving means 45 amplifies the PWM signal output from the control means 40 to alternately turn on or turn off the six power transistors TR1 to TR6 of the inverter means 50 to convert the converter. When the DC power output from the means 30 is converted into three-phase AC power and outputted, the compressor 31 is operated by three-phase (u-phase, v-phase, w-phase) AC power output to the inverter means 50. do.

At this time, the room temperature Tr lowered by the operation of the compressor 31 is sensed by the room temperature detecting means 55. In step S23, it is determined whether the room temperature Tr is equal to or lower than the set temperature Ts-1. If the room temperature Tr is not equal to or lower than the set temperature Ts-1 (NO), the process returns to the step S22 and repeats the operation of the step S22 or less.

As a result of the discrimination in step S23, when the room temperature Tr is equal to or lower than the set temperature Ts-1 (YES), the process proceeds to step S24, and the inverter means 50 for driving the inverter output from the control means 40. The compressor 31 is turned off in accordance with the PWN signal.

The indoor temperature Tr, which is increased by turning off the compressor 31, is sensed by the indoor temperature detecting means 55. In step S25, it is determined whether the indoor temperature Tr is greater than or equal to the set temperature Ts, and the indoor temperature Tr. If () is not equal to or higher than the set temperature Ts (NO), the flow returns to step S24 to repeat the operation of step S24 and below.

As a result of the discrimination in step S25, when the room temperature Tr is equal to or higher than the set temperature Ts (YES), the process proceeds to step S26, where the control means 40 {set temperature Ts + 0} and the room temperature Tr E [N], which is the difference of), is obtained by the following Equation (2),

E [N] = (Tr [N] +0) -Tr [N]... (2)

Substitute this E [N] value in the following formula (1) to recalculate the starting frequency during cooling operation.

Starting frequency during cooling operation = E [N] × 10 + 30 [Hz]. (One)

The compressor 31 is started at this recalculated starting frequency, and the process returns to step S21 to repeat the operation of step S21 and below.

As described above, according to the compressor control apparatus and method of the air conditioner according to the present invention, the heating temperature is calculated in the heating operation than in the cooling operation, and the indoor temperature reaches the set temperature during the cooling operation and the heating operation. It is possible to shorten the time difference and to restart the compressor at the calculated starting frequency even when the compressor is restarted during operation of the air conditioner. Therefore, it is possible to improve the haptic efficiency by reducing the haptic temperature during the cooling operation and increasing the haptic temperature during the heating operation. It works.

Claims (3)

In the air conditioner including a compressor for operating in accordance with the operating frequency calculated by using a purge table, the apparatus for controlling the compressor is a room temperature sensing means for sensing the room temperature, the room sensed by the room temperature sensing means Control means for calculating the starting frequency of the compressor in accordance with the difference between the temperature and the set temperature, and inverter means for starting the compressor in accordance with the starting frequency calculated by the control means, the control means is the indoor temperature sensing It is determined whether the cooling or heating operation according to the room temperature sensed by the means, and during the heating operation to calculate the start frequency of the compressor higher than during the cooling operation to output a control signal for starting the compressor Compressor control device of air conditioner. Determination of the operation frequency of the compressor according to the operation determination step of detecting the room temperature to determine whether it is a heating or cooling operation, and the cooling operation frequency calculated in the control means with the indoor temperature and the set temperature if the cooling operation in the operation determination step. The compressor to start the compressor and calculate the operating frequency of the compressor according to the cooling operation frequency calculation formula set in the control means as a calculated value using a purge table after the compressor is started in the compressor cooling start step to operate the compressor. The compressor cooling operation step and the indoor temperature which changes according to the compressor operation in the compressor cooling operation step are compared with the set temperature, and the compressor is turned off when the indoor temperature is more than the set temperature + 5 ° C, and the indoor temperature is +3. A compressor cooling control step of operating the compressor if it is lower than or equal to Recovered at the same time, the compressor control method of the air conditioner, characterized in that depending on the ambient temperature and the set point consisting of the compressor is restarted with the step of re-calculating a start frequency of the compressor to restart the compressor. The operation discrimination step of sensing the indoor temperature to determine whether it is a heating or cooling operation, and if the heating operation in the operation discrimination step, cooling the starting frequency of the compressor according to the heating start frequency calculation formula set in the control means with the indoor temperature and the set temperature. Compressor heating start step for starting the compressor by calculating higher than during operation, and using the purge table after the compressor start in the compressor heating start step, and calculating the operating frequency of the compressor according to the heating operation frequency calculation formula set in the control means. The compressor heating operation step of calculating and operating the compressor, and comparing the indoor temperature which changes according to the compressor operation in the compressor heating operation step with the set temperature, turns off the compressor when the indoor temperature is less than the set temperature -1 ° C. If is higher than the set temperature, the compressor heating control step of operating the compressor, Compressor control method of the air conditioner, characterized in that when restarting during operation of the compressor, the compressor restart step of restarting the compressor by recalculating the starting frequency of the compressor according to the room temperature and the set temperature.

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