JP6947562B2 - Air conditioner - Google Patents

Description

The present invention relates to an air conditioner and a method for controlling an air conditioner.

As a method of controlling the fan of the outdoor unit, as disclosed in Patent Document 1, it is determined from the rotation speed and the rotation direction of the fan whether the required heat exchange amount is obtained, and the required heat exchange amount is determined. A technique for stopping the drive of a fan when it is determined that the fan has been obtained is known.

Japanese Unexamined Patent Publication No. 2001-268972

However, in the method of Patent Document 1, since the heat exchange amount is determined only by the fan information, the accurate heat exchange amount cannot be determined, and it is considered that the operation and stop of the fan are unintended movements. Further, when the fan is repeatedly started and stopped, the amount of heat exchange fluctuates greatly, so that the temperature change of the air-conditioned space becomes large, and it is difficult to obtain a comfortable space.

Therefore, the present invention has been made in view of the above problems, and air that enables a comfortable space to be realized by varying the amount of heat exchange by operating the outdoor fan with a predetermined fluctuation control during the cooling operation. The purpose is to provide a harmonizer and a control method.

In order to solve the above problems, the air conditioner according to the present invention is an air conditioner including an indoor unit and an outdoor unit, and the outdoor unit is a compressor and an outdoor heat exchanger to which refrigerant is supplied from the compressor. An outdoor fan that blows air to the air and a control device that controls a compressor and an outdoor fan are provided, and the control device controls a predetermined fluctuation that changes the rotation speed of the outdoor fan over time at a predetermined trigger during cooling operation. To carry out.

According to the present invention, the rotation speed of the outdoor fan can be changed with the passage of time at a predetermined trigger during the cooling operation, so that the compressor does not repeatedly start and stop, and comfortable air conditioning can be achieved. It can contribute to the realization.

It is a block block diagram of the main part of an air conditioner. It is a system block diagram of an air conditioner. It is explanatory drawing of an inverter circuit. (A) is an explanatory diagram showing the relationship between the actual axis and the control axis of the motor, and (b) is an explanatory diagram showing the current vector when a positioning current is passed through the motor. It is a block diagram of the start-up state estimation part provided with the motor control device. It is operation explanatory drawing of the air conditioner in 1st Example. It is operation explanatory drawing of the air conditioner in 2nd Example. It is operation explanatory drawing of the air conditioner in 3rd Example. It is operation explanatory drawing of the air conditioner in 4th Example. It is operation explanatory drawing of the air conditioner in 5th Example. It is operation explanatory drawing of the air conditioner in 6th Example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As described later, the air conditioner according to the present embodiment includes a compressor 41, an outdoor heat exchanger 43, an outdoor fan F, an expansion valve 44, an indoor heat exchanger 45, an indoor fan F1, and a motor. In the air conditioner AS having the control device 1, the outdoor fan F is not operated at a constant speed during the cooling operation, but the rotation speed of the outdoor fan F is changed with the passage of time. According to the present embodiment, it is possible to suppress a decrease in the space temperature while dehumidifying, suppress the compressor from repeating operation and stop, and realize a comfortable space.

The first embodiment will be described with reference to FIGS. 1 to 6. The examples described below are one example, and the present invention is not limited to the configuration of the examples.

FIG. 1 is a configuration diagram of a motor control device 1 according to the present embodiment. The motor control device 1 as a "control device" outputs a control signal to the inverter circuit 2 based on the current detection value of the shunt resistor R1 installed on the DC side of the inverter circuit 2 to drive the motor M without a position sensor. It is a device.

Hereinafter, first, the inverter circuit 2 and the motor M, which are the control targets of the motor control device 1, will be briefly described. Next, the outdoor fan F and the like connected to the motor M will be described, and then the control method will be described in detail.

The inverter circuit 2 shown in FIG. 1 converts a DC voltage (DC power) input from the DC power supply 3 into a 3-phase AC voltage (3-phase AC power), and outputs the 3-phase AC voltage to the motor M. It is a vessel. Here, in the DC power supply 3, the AC power input from the AC power supply 31 is converted into DC power by the rectifier circuit 32 and the smoothing capacitor 33.

In the inverter circuit 2, the first leg including the switching elements Tr_Pu and Tr_Nu (see FIG. 3), the second leg including the switching elements Tr_Pv and Tr_Nv, and the third leg including the switching elements Tr_Pw and Tr_Nw are connected in parallel to each other. It is composed of being done. In the following, any switching element may be simply referred to as "switching element Tr".

Reflux diodes D_Pu, D_Nu, etc. are connected in antiparallel to the switching element Tr in order to prevent the switching element Tr from being destroyed by commutation (see FIG. 3).

The bus PL connected between the common connection point of the lower arm switching elements Tr_Nu, Tr_Nv, Tr_Nw (see FIG. 3) of the inverter circuit 2 and the negative electrode of the DC power supply 3 (that is, the DC side of the inverter circuit 2). ) Is equipped with a shunt resistor R1 (current detector). The detected value of the current flowing through the shunt resistor R1 is output to the current reproduction processing unit 101 of the motor control device 1 shown in FIG.

The motor M is, for example, a brushless DC motor, and is a stator (armature: not shown) around which three-phase windings Lu, Lv, Lw (see FIG. 3) are wound, and rotates with respect to the stator. It has a rotor (permanent magnet: not shown) that is pivotally supported.

When the inverter circuit 2 is driven, the directions of the currents flowing through the three-phase windings Lu, Lv, and Lw are switched, and an attractive force and a repulsive force are generated with the rotor. The shaft AX of the rotor of the motor M is connected to the outdoor fan F of the air conditioner AS.

FIG. 2 is a system configuration diagram of an air conditioner AS including an outdoor fan F connected to a motor M. The arrow shown in FIG. 2 indicates the direction in which the refrigerant flows during the cooling operation.

The air conditioner AS includes, for example, a compressor 41, a four-way valve 42, an outdoor heat exchanger 43, an expansion valve 44, an indoor heat exchanger 45, an outdoor fan F, and an indoor fan F1. The refrigerant circuit 40 is configured by sequentially connecting the four-way valve 42, the compressor 41, the outdoor heat exchanger 43, the expansion valve 44, and the indoor heat exchanger 45 in an annular shape.

The outdoor fan F is a fan that sends outdoor air to the outdoor heat exchanger 43, and is installed in the outdoor unit ASo. As the outdoor fan F rotates, the refrigerant flowing through the outdoor heat exchanger 43 and the outside air exchange heat. As described above, the rotor of the motor M (not shown) is connected to the outdoor fan F.

The indoor fan F1 is a fan that sends indoor air to the indoor heat exchanger 45, and is installed in the indoor unit ASi. The rotation of the indoor fan F1 causes heat exchange between the refrigerant flowing through the indoor heat exchanger 45 and the indoor air. Another motor M1 is installed in the indoor fan F1.

Subsequently, the configuration of the motor control device 1 will be described. The motor control device 1 shown in FIG. 1 is a device that generates a PWM signal based on the current detection value Ist input from the shunt resistor R1 and outputs the PWM signal to the inverter circuit 2.

The motor control device 1 is configured as, for example, a microcomputer (not shown), reads a computer program stored in a ROM (Read Only Memory), expands it into a RAM (Random Access Memory), and deploys it in a CPU (Central). Processing Unit) is designed to execute various processes.

In the configuration diagram shown in FIG. 1, the start-up state estimation unit 115 and the start-up mode setting unit 116 shown by the thick frame lines are used when the motor M is started (that is, stopped), and the motor M is driven. Not used inside.

FIG. 4A is an explanatory diagram showing the relationship between the actual axis of the motor M and the control axis. The d-axis shown in FIG. 4A is an axis representing the magnetic flux direction of the rotor, which is a permanent magnet, and the q-axis is an axis orthogonal to the d-axis. When performing position sensorless control, current control is performed on the dc axis as the estimated d-axis and the qc axis as the estimated q-axis. In the following, the d-axis and the q-axis may be referred to as a "real axis", and the dc-axis and the qc-axis may be referred to as a "control axis".

As shown in FIG. 1, the motor control device 1 mainly includes a current reproduction processing unit 101, a three-phase / two-axis converter 102, an axis error estimator 103, a voltage command calculator 112, and a two-axis / three. It includes a phase converter 113, a PWM signal generator 114, a start-up state estimation unit 115, and a start-up mode setting unit 116.

The current reproduction processing unit 101 has a three-phase current Iuc, which flows from the current detection value Ist input from the shunt resistor R1 and the ON / OFF signal of the switching element Tr (see FIG. 3) of the inverter circuit 2 to the motor M. Ivc and Iwc are reproduced. The current reproduction processing unit 101 outputs the reproduced three-phase currents Iuc, Ivc, and Iwc to the three-phase / two-axis converter 102.

The three-phase / two-axis converter 102 executes the following processing while driving the motor M. That is, the three-phase / two-axis converter 102 has the dc-axis currents Idc and qc-axis of the control system based on the reproduced three-phase currents Iuc, Ivc, and Iwc and the phase θdc input from the integrator 107. Calculate the current Iqc.

The three-phase / two-axis converter 102 outputs the dc-axis current Idc to the d-axis current command generator 108 and outputs the qc-axis current Iqc to the q-axis current command generator 109. Further, the three-phase / two-axis converter 102 outputs the dc-axis current Idc and the qc-axis current Iqc to the axis error estimator 103.

In FIG. 1, the signal line of the dc-axis current Idc and the signal line of the qc-axis current Iqc are described as the same signal line from the middle, but in reality, the axis error estimator is used as a separate signal. It is input to 103 and the like (the same applies to Vdc * and Vqc * described later).

Further, when the three-phase / two-axis converter 102 starts the motor M (that is, while the motor M is stopped driving), the three-phase / two-axis converter 102 executes the following processing. That is, the three-phase / two-axis converter 102 calculates the feedback currents Idfb and Iqfb from the three-phase currents Iuc, Ivc, and Iwc input from the current reproduction processing unit 101. Then, the three-phase / two-axis converter 102 outputs the calculated feedback currents Idfb and Iqfb to the start-up state estimation unit 115.

As described above, the processing content of the three-phase / two-axis converter 102 differs between when the motor is started and when the motor is being driven.

The axis error estimator 103 estimates the axis error Δθc based on the dc-axis voltage command Vdc *, the qc-axis voltage command Vqc *, the dc-axis current Idc, the qc-axis current Iqc, and the electric angular frequency ω1c. .. That is, the shaft error estimator 103 estimates the shaft error Δθc between the actual shaft of the motor M and the control shaft based on the current value Ist input from the shunt resistance R1. A detailed description of the estimation process will be omitted.

The axis error estimator 103 outputs the estimated axis error Δθc to the code inversion device 104.

The code inversion device 104 inverts the sign of the axis error Δθc input from the axis error estimator 103 (that is, subtracts the axis error Δθc from zero, which is the axis error command value). The code inversion device 104 outputs a value (−Δθc) to the PLL circuit 105.

The PLL (Phase Locked Loop) circuit 105 executes PI (Proportional Integral) control using the value (−Δθc) input from the code inversion device 104, and calculates the angular frequency correction value Δω1 of the motor M. The PLL circuit 105 outputs the calculated angular frequency correction value Δω1 to the adder 106.

The adder 106 adds the electric angular frequency command ω1 * input from the angular frequency command calculator 111 and the angular frequency correction value Δω1 input from the PLL circuit 105 to calculate the angular frequency correction value Δω1. The adder 106 outputs the angular frequency correction value Δω1 to the integrator 107 and the axis error estimator 103.

The integrator 107 integrates the electric angular frequency ω1c input from the adder 106 to calculate the phase estimation value θdc. The integrator 107 outputs the calculated phase estimation value θdc to the three-phase / two-axis converter 102 and the two-axis / three-phase converter 113.

The d-axis current command generator 108 calculates the d-axis current command Id * based on the dc-axis current Idc input from the three-phase / two-axis converter 102. The d-axis current command generator 108 outputs the calculated d-axis current command Id * to the voltage command calculator 112.

The q-axis current command generator 109 calculates the q-axis current command Iq * based on the qc-axis current Iqc input from the three-phase / two-axis converter 102. The q-axis current command generator 109 outputs the calculated q-axis current command Iq * to the voltage command calculator 112.

Further, the d-axis current command generator 108 and the q-axis current command generator 109 generate a predetermined positioning current when a start command is input from the remote controller 5 (that is, immediately before actually driving the motor M). .. As described above, the positioning current is a minute current for detecting the idling state of the outdoor fan F. The process using the positioning current will be described later.

The angular frequency command generator 110 generates an angular frequency command ωr * to drive the motor M according to a preset computer program so as to send a predetermined amount of outside air to the outdoor heat exchanger 43. The angular frequency command generator 110 outputs the generated angular frequency command ωr * to the angular frequency command calculator 111. The fluctuation control for changing the rotation speed of the outdoor fan F follows the angular frequency command ωr * output by the angular frequency command generator 110.

Further, the angular frequency command generator 110 generates the angular frequency command ωr * = 0 when the positioning current (d-axis current command) is passed through the armature immediately before the motor M is started. Further, the angular frequency command generator 110 generates an angular frequency command ωr * based on the electric angular frequency Frq estimated by the start-up state estimation unit 115 and the state information input from the start-up mode setting unit 116. do.

The angular frequency command calculator 111 calculates the electric angular frequency command ω1 * by multiplying the angular frequency command ωr * input from the angular frequency command generator 110 by the number of pole pairs (P / 2) of the motor M. The angular frequency command calculator 111 outputs the calculated electric angular frequency command ω1 * to the adder 106 and the voltage command calculator 112.

The voltage command calculator 112 calculates the d-axis voltage command Vd * and the q-axis voltage command Vq * based on the d-axis current command Id *, the q-axis current command Iq *, and the electric angular frequency command ω1 *. .. The voltage command calculator 112 outputs the calculated d-axis voltage command Vd * and q-axis voltage command Vq * to the axis error estimator 103 and the 2-axis / 3-phase converter 113.

The 2-axis / 3-phase converter 113 is based on the d-axis voltage command Vd * and q-axis voltage command Vq * input from the voltage command calculator 112 and the phase estimation value θdc input from the integrator 107. , Calculate the three-phase voltage commands Vu *, Vv *, Vw * of the motor. Then, the two-axis / three-phase converter 113 outputs the calculated three-phase voltage commands Vu *, Vv *, and Vw * to the PWM signal generator 114.

The PWM signal generator 114 generates a PWM signal based on the three-phase voltage commands Vu *, Vv *, Vw * input from the two-axis / three-phase converter 113. The PWM signal generator 114 outputs the generated PWM signal to the switching element Tr (see FIG. 3) of the inverter circuit 2.

The start-up state estimation unit 115 estimates the idling state of the motor M at start-up based on the feedback currents Idfb and Iqfb flowing through the shunt resistor R1 with the input of the positioning current described above. Here, in the "idle state of the motor M", the phase angle of the motor current flowing through the three-phase windings Lu, Lv, and Lw, the electric angular frequency, and the direction in which the rotor idles (forward rotation, stop, reverse rotation) are included. included.

FIG. 4B shows a current vector when a positioning current is passed through the motor M. When the motor M is not idling, a current I corresponding to the positioning current with reference to the d-axis flows through the shunt resistor R1. In this case, the feedback current Iqfb of the q-axis component becomes zero.

On the other hand, when the motor M is idling, the current ΔI affected by the counter electromotive force is added to the current I, and the current (I + ΔI) added as a vector flows through the shunt resistor R1. That is, as shown in FIG. 4B, the phase angle of the current (I + ΔI) changes according to the speed and direction in which the motor M idles.

FIG. 5 is a configuration diagram of a start-up state estimation unit 115 included in the motor control device 1. The start-up state estimation unit 115 includes a current phase calculation unit 115a, a d-axis phase conversion unit 115b, a subtractor 115c, a phase difference calculation unit 115d, a state determination unit 115e, and a frequency calculation unit 115f. ing.

The current phase calculation unit 115a calculates the phase angle of the motor current based on the feedback currents Idfb and Iqfb input from the three-phase / two-axis converter 102 when starting the motor M. The current phase calculation unit 115a calculates the phase angle φ at a predetermined cycle (for example, every 0.01 sec). The current phase φ is calculated based on the following (Formula 1). Incidentally, in order to execute the arithmetic processing on the basis of the q-axis in the present embodiment, the denominator is set to the feedback current Iqfb on the q-axis in (Formula 1).

The current phase calculation unit 115a outputs the first calculated phase angle φ to the d-axis phase conversion unit 115b after the start command is input from the remote controller 5 (see FIG. 1). Further, the current phase φ calculated in a predetermined cycle is stored in the storage means (not shown).

The d-axis phase conversion unit 115b calculates the d-axis phase θd based on the current phase φ input from the current phase calculation unit 115a. The positioning current is given as a d-axis start (d-axis current command Id * ≠ 0, q-axis current command Iq * = 0), and the rotation frequency command ωr * = 0 [Hz]. Therefore, it is considered that the current phase φ of the motor M and the d-axis phase θd correspond to each other.

When information indicating "normal rotation" is input from the state determination unit 115e, the d-axis phase conversion unit 115b calculates the d-axis phase θd based on the following (Formula 2) (see FIG. 4A). ).

Further, when the rotor is reversed (idle), the phase of the d-axis is shifted by π [rad] as compared with the case of normal rotation. When the information indicating "reversal" is input from the state determination unit 115e, the d-axis phase conversion unit 115b calculates the d-axis phase θd based on the following (Formula 3).

The d-axis phase conversion unit 115b outputs the calculated d-axis phase θd (that is, the phase angle of the motor current) to the integrator 107 shown in FIG.

The subtractor 115c calculates the phase difference Δφn between the phase angle φn calculated this time (after the second time) and the previous phase angle φn-1. The subtractor 115c outputs the calculated phase difference Δφn to the phase difference calculation unit 115d.

The phase difference calculation unit 115d calculates the phase difference Δφsum by summing N pieces with respect to the phase difference Δφn calculated in a predetermined cycle based on the equation 4. The above-mentioned value N is a preset value (for example, N = 16) for ensuring the calculation accuracy of the motor M. That is, by storing the current phase in an N-stage buffer (not shown) and obtaining the phase difference Δφsum, the frequency Frq and the like can be calculated accurately even when the rotor is idling at a low speed.

The phase difference calculation unit 115d outputs the calculated phase difference Δφsum to the state determination unit 115e and the frequency calculation unit 115f. The state determination unit 115e determines whether the rotor (that is, the outdoor fan F) is idling in the forward rotation / idling / stopping / idling in the reverse rotation based on the phase difference Δφsum input from the phase difference calculation unit 115d. judge. The relationship between the phase difference Δφsum and the state of the rotor is shown in Table 1 below. When the absolute value of the phase difference Δφsum is equal to or less than a predetermined value, the state determination unit 115e may determine “stop”.

The state determination unit 115e outputs the determination result to the d-axis phase conversion unit 115b, the frequency calculation unit 115f, and the activation mode setting unit 116 (see FIG. 1).

The frequency calculation unit 115f calculates the electric angular frequency Frq when the rotor idles based on the phase difference Δφsum input from the phase difference calculation unit 115d. That is, the frequency calculation unit 115f calculates the electric angular frequency Frq by dividing the phase difference Δφsum by the value NΔT obtained by multiplying the above-mentioned value N and the calculation period ΔT of the phase angle φ, and further multiplying by a predetermined constant. do. The frequency calculation unit 115f outputs the calculated electric angular frequency Frq to the angular frequency command generator 110 (see FIG. 1) and the activation mode setting unit 116.

The start-up mode setting unit 116 sets the start-up mode of the motor M based on the electric angular frequency Frq input from the start-up state estimation unit 115 and the above-mentioned state information. The activation mode setting unit 116 outputs the set activation mode to the angular frequency command calculator 111.

Subsequently, the fluctuation control of the outdoor fan F will be described with reference to FIG. In this embodiment, the rotation speed of the outdoor fan is not constant, but is changed at a predetermined period PT (hereinafter, referred to as fluctuation control).

As shown on the lower side of FIG. 6, in the fluctuation control, the rotation speed of the outdoor fan F changes with the passage of time. As a result, a period in which the rotation speed is high and a period in which the rotation speed is low can be obtained. Since the amount of heat exchange is large during the period when the rotation speed is high, dehumidification can be performed as shown in the third from the top of FIG. On the other hand, during the period when the rotation speed is low, the amount of heat exchange is small, so that the change in room temperature shown at the top of FIG. 6 can be suppressed. By repeating this, it is possible to suppress changes in room temperature while dehumidifying, and a comfortable space can be realized.

That is, according to this embodiment, the rotation speed of the outdoor fan is not controlled at a constant speed, but is driven by fluctuation control that changes with the passage of time, so that the room temperature does not reach the set temperature Ts. The amount of heat exchange of the machine ASo can be controlled. As a result, the intermittent operation of the compressor 41 is suppressed, such as the compressor 41 stopping the operation because the room temperature reaches the set temperature Ts, or the compressor 41 restarting the operation because the room temperature exceeds the set temperature Ts. can do.

Therefore, according to the present embodiment, the intermittent operation of the compressor 41 can be suppressed, so that comfortable air conditioning can be realized. Further, since the rotation speed of the outdoor fan F is changed, the effect of suppressing the power consumption is also obtained.

The second embodiment will be described with reference to FIG. 7. Since each of the following examples including this embodiment corresponds to a modified example of the first embodiment, the differences from the first embodiment will be mainly described.

FIG. 7 is a time chart showing a control method of the outdoor fan F. In this embodiment, the fan rotation speed and the fluctuation cycle during fluctuation control are limited with respect to the first embodiment. That is, in this embodiment, the rotation speed of the outdoor fan F is changed between the upper limit value RH and the lower limit value RL. Further, in this embodiment, the period PT of the fluctuation control is set to be equal to or higher than the lower limit value PTL. As shown at the bottom of FIG. 7, the change in the outdoor fan speed before the restriction is applied is shown by a dotted line. The solid line shows the change in the outdoor fan speed after the restriction is applied.

For the limit values RH, RL, and PTL, for example, the values examined in advance in experiments and the like are used. By providing the limit, it is possible to reduce the sound generated by changing the rotation speed of the outdoor fan F. Thereby, the discomfort caused by the sound can be reduced.

The third embodiment will be described with reference to FIG. FIG. 8 is a time chart diagram showing a control method of the outdoor fan F. In this embodiment, execution conditions for executing fluctuation control are provided for the first embodiment.

As shown at the top of FIG. 8, when the room temperature shown by the solid line is away from the set temperature Ts after the start of operation, the outdoor fan F is operated at a constant rotation to exchange heat and approach the set temperature Ts. After that, when the room temperature falls within a predetermined range with respect to the set temperature Ts, the fluctuation control is executed. If the room temperature rises out of the predetermined range due to a change in the surrounding environment during the fluctuation control execution, the fluctuation control is stopped and the outdoor fan F is operated at a constant rotation.

In this embodiment shown in FIG. 8, it is assumed that the fluctuation control execution condition is satisfied when the room temperature drops from a state higher than the fluctuation control execution temperature Tf (Tf> Ts) to the fluctuation control execution temperature Tf. Then, when the room temperature rises from a state lower than the fluctuation control execution temperature Tf to the fluctuation control execution temperature Tf, it is assumed that the fluctuation control execution condition is no longer satisfied.

In this embodiment, the room temperature can be brought closer to the set temperature Ts quickly by performing the fluctuation control only when the room temperature drops to the vicinity of the set temperature Ts, and the room temperature is stabilized near the set temperature Ts. Can be done. As a result, a comfortable air-conditioned space can be realized.

The fourth embodiment will be described with reference to FIG. FIG. 9 is a time chart diagram showing a control method of the outdoor fan F according to the present embodiment. In this embodiment, the execution conditions for fluctuation control are set as in the third embodiment. In this embodiment, it is assumed that the execution condition of the fluctuation control is satisfied when the thermo-OFF state (that is, the compressor 41 is in the OFF state) is repeated a predetermined number of times.

In the thermo-OFF state, the compressor 41 is stopped and the outdoor fan F is also stopped, so that heat exchange is not performed during that time, and both the room temperature and the humidity rise.

When the room temperature exceeds the set temperature Ts, the compressor 41 and the outdoor fan F operate again (thermo ON state, compressor 41 ON state) and heat exchange is performed, so that both the room temperature and the humidity decrease. do.

If this thermo-ON / OFF state is repeated, the room temperature and humidity will repeatedly rise and fall, causing discomfort to the user in the room. Therefore, in this embodiment, when it is detected that the thermo ON / OFF state is repeated, fluctuation control is performed. In the example shown in FIG. 9, when the compressor 41 is stopped three times, that is, when the thermo-off state appears three times, it is determined that the condition for executing the fluctuation control is satisfied. The predetermined number of times is not limited to "3".

In this embodiment, the heat exchange amount of the outdoor unit ASo is adjusted by controlling the rotation speed of the outdoor fan F to fluctuate, and the room temperature is stabilized near the set temperature Ts. However, it is conceivable that the room temperature stabilizes even if the fluctuation control is not performed. In this case, it is not necessary to perform fluctuation control. Therefore, if the repetition of thermo-ON / OFF is monitored as in this embodiment, it is possible to suppress unnecessary fluctuation control.

A fifth embodiment will be described with reference to FIG. FIG. 10 is a time chart diagram showing a control method of the outdoor fan F according to the present embodiment. Similar to the third and fourth embodiments, this embodiment also provides execution conditions for fluctuation control. In this embodiment, fluctuation control is executed according to the opening degree of the electric expansion valve 44.

In the air conditioner AS of this embodiment, the heat exchange amount is adjusted by changing the opening degree of the electric expansion valve 44 between the maximum opening degree VaH and the minimum opening degree VaL. Here, if the fluctuation control is performed at the same time as adjusting the heat exchange amount by the electric expansion valve 44, the cycle may become unstable.

Therefore, in this embodiment, as shown at the bottom of FIG. 10, when the opening degree of the electric expansion valve 44 reaches the maximum opening degree VaH, it is determined that the fluctuation control execution condition is satisfied, and the fluctuation control is performed. To execute. The cycle can be stabilized by shifting the execution timing between the control by the electric expansion valve 44 and the fluctuation control.

Even in a region where the electric expansion valve 44 has a maximum opening degree of VaH and the heat exchange amount cannot be adjusted only by the electric expansion valve 44, fluctuation control can be performed to adjust the heat exchange amount in this embodiment, so that the cycle can be adjusted for comfort. Air conditioning can be realized.

A sixth embodiment will be described with reference to FIG. FIG. 11 is a time chart diagram showing a control method of the outdoor fan F according to the present embodiment. In this embodiment, the fourth embodiment is improved, and it corresponds to the case where the thermo-ON / OFF occurs even if the fluctuation control is executed. The same applies to the first to fifth embodiments described above, but in general, in the interior of a private house or the like, which is the target of air conditioning of the air conditioner AS, users frequently come and go, and electric appliances such as cooking utensils are used. Since it is used suddenly, it has the characteristic that the room temperature changes drastically.

The occurrence of the thermo ON / OFF state means that the room temperature changes drastically. In this case, the fluctuation control cycle and the fan rotation speed fluctuation range are changed. Regarding the adjustment amount, monitor the change in room temperature per hour during the period from the previous thermo-ON to the current thermo-OFF, and apply the monitored room temperature change to the compensation amount table and correction amount calculation formula determined in advance by experiments, etc. The amount of adjustment is determined by this.

There are four adjustment terms, for example, the rotation speed and period on the low speed side and the rotation speed and period on the high speed side. Since the temperature change is drastic, the rotation speed is further lower and the period is longer on the low speed side, and the rotation speed is further lower and the cycle is further shortened on the high speed side.

As a result, the amount of heat exchange can be suppressed and the temperature change can be reduced, so that the occurrence of thermo-ON / OFF can be prevented.

That is, in this embodiment, by learning the parameters of the fluctuation control of the outdoor fan F at the time of the current thermo-ON from the situation at the time of the previous thermo-ON, comfortable air conditioning is realized according to the situation of the room temperature change.

The present invention is not limited to the above-described embodiment, and includes various modifications. The above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, other configurations can be added / deleted / replaced with respect to a part of the configurations of each embodiment.

Each of the above configurations, functions, processing units, processing means, and the like may be realized by hardware, for example, by designing a part or all of them with an integrated circuit. Further, each of the above configurations, functions, and the like may be realized by software by the processor interpreting and executing a program that realizes each function. Information such as programs, tables, and files that realize each function can be stored in a memory, a hard disk, a recording device such as an SSD (Solid State Drive), or a recording medium such as an IC card, an SD card, or a DVD.

Further, the technical features included in the above-described embodiment are not limited to the combinations specified in the claims, and can be appropriately combined.

1: Motor control device, 2: Inverter circuit, 3: DC power supply, 41: Compressor, 42: Four-way valve, 43: Outdoor heat exchanger, 44: Expansion valve, 45: Indoor heat exchanger, F: Outdoor fan

Claims (5)

An air conditioner equipped with an indoor unit and an outdoor unit.
The outdoor unit is
With a compressor,
An outdoor fan that blows air to the outdoor heat exchanger to which the refrigerant from the compressor is supplied, and
A control device for controlling the compressor and the outdoor fan is provided.
The control device is
A predetermined trigger in the cooling operation, and performs a predetermined fluctuation control to time change according to a predetermined cycle and a predetermined acceleration and deceleration pattern the rotational speed of the outdoor fan,
In front Symbol predetermined fluctuation control, set limits with respect to the rotational speed of the fluctuation of the time variation of the outdoor fan,
Air conditioner. The predetermined trigger is when the difference between the room temperature and the set temperature is within the predetermined range.
The air conditioner according to claim 1. An air conditioner equipped with an indoor unit and an outdoor unit.
The outdoor unit is
With a compressor,
An outdoor fan that blows air to the outdoor heat exchanger to which the refrigerant from the compressor is supplied, and
A control device for controlling the compressor and the outdoor fan is provided.
The control device is
If the compressor had us when cooling operation is stopped a predetermined number of times, performing the predetermined fluctuation control to time change according to a predetermined cycle and a predetermined acceleration and deceleration pattern the rotational speed of the outdoor fan,
Air conditioner. An air conditioner equipped with an indoor unit and an outdoor unit.
The outdoor unit is
With a compressor,
An outdoor fan that blows air to the outdoor heat exchanger to which the refrigerant from the compressor is supplied, and
A control device for controlling the compressor and the outdoor fan is provided.
The control device is
A predetermined fluctuation control that changes the rotation speed of the outdoor fan over time according to a predetermined cycle and a predetermined acceleration / deceleration pattern at a predetermined trigger determined based on the state of the electric expansion valve of the indoor unit during the cooling operation. To carry out,
Air conditioner. The control device adjusts at least one of the predetermined period or the predetermined acceleration / deceleration pattern in the current predetermined fluctuation control based on the room temperature change during the previous execution of the predetermined fluctuation control.
The air conditioner according to any one of claims 1 to 4.

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