CN111750510B - Control device and control method for air conditioner - Google Patents
Control device and control method for air conditioner Download PDFInfo
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- CN111750510B CN111750510B CN201910251877.0A CN201910251877A CN111750510B CN 111750510 B CN111750510 B CN 111750510B CN 201910251877 A CN201910251877 A CN 201910251877A CN 111750510 B CN111750510 B CN 111750510B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
Abstract
The present invention relates to a control device and a control method for an air conditioner. The control device of the air conditioner is a control device of the air conditioner comprising a fan, a motor for driving the fan and a filter screen for filtering air sucked into the fan, and comprises a reading unit, a storage unit, a rotating speed compensation grade judging unit and a rotating speed compensation unit, wherein the storage unit is stored with a rotating speed compensation grade judging formula in advance. The control method of the air conditioner is a control method of the air conditioner comprising a fan, a motor for driving the fan, and a filter screen for filtering air sucked into the fan, and comprises a first step, a second step, and a third step. According to the present invention, it is possible to provide a wind volume compensation device capable of reliably compensating for a loss due to clogging of a filter.
Description
Technical Field
The present invention relates to a control device and a control method for an air conditioner.
Background
Conventionally, as in the invention described in publication No. CN 101251287a, the product of the current and the voltage detected by the current detecting unit and the voltage detecting unit is not accurate power consumption of the motor. For an AC motor, the product may be slightly larger than the actual power consumption due to losses such as friction. In addition, the AC motor is greatly affected by environmental conditions and the like, and cannot accurately output the initially set rotational speed. In actual operation, the comparison of the consumed power at different rotating speeds has no significance; for a DC motor, since it is a DC motor, the power consumption is much smaller than the product, and it cannot be used to represent the power consumption. Therefore, the power consumption value of the motor is not accurate, and the motor can only be applied to an AC motor.
As in the invention disclosed in publication No. CN 101251287a, a reference power of the motor is set in advance. However, the power consumption of the motor generally increases due to the loss after a long time use. The fixed reference power value set in advance is increasingly unable to represent the actual state of the motor at that time.
In the conventional art, as in the invention described in publication No. CN 108331777 a, the voltage is increased to increase the rotation speed. Increasing the voltage may cause losses to the motor. With the result that the life of the motor may be shortened.
The conventional air volume control method of the air conditioner generally requires many additional components (a current detection unit and a voltage detection unit are required as in the invention described in publication No. CN 101251287a, a temperature sensor is required as in the invention described in publication No. CN 105091229B, a current detection module is required as in the invention described in publication No. CN 105258288B, a wind pressure sensor is required as in the invention described in publication No. CN 107781957 a) or many other parameters (an ambient temperature and an air density are required as in the inventions described in publication nos. CN 103423837B, and an ambient temperature and an air density are required as in the inventions described in publication nos. CN 107514740 a and CN 105091229B), which is too costly, increases the difficulty of control and the failure rate, and makes it too difficult to perform maintenance after a failure.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a control device and a control method for an air conditioner capable of reliably compensating for an air volume lost due to clogging of a filter.
A control device for an air conditioner according to the present invention is a control device for an air conditioner including a fan, a motor for driving the fan, and a filter for filtering air sucked into the fan, the control device including reading means, storage means, rotation speed compensation level determining means, and rotation speed compensation means, wherein the storage means stores a rotation speed compensation level determining expression in advance, the reading means reads a plurality of reference powers corresponding to a plurality of rotation speeds of the motor in a case where the air conditioner is used for the first time under a predetermined condition, and reads a plurality of current powers corresponding to a plurality of rotation speeds of the motor in a case where the air conditioner is used for the N-th time under the predetermined condition, the rotation speed compensation level determining means calculates a ratio of the current power at each rotation speed to the reference power, and substituting the calculated ratio into the rotation speed compensation level decision expression to determine a rotation speed compensation level of the motor, wherein the rotation speed compensation means adds a rotation speed compensation amount corresponding to the rotation speed compensation level to the rotation speed of the motor, and N is a natural number of 2 or more.
In the control device for an air conditioner according to the present invention, the motor that drives the fan may be a dc motor.
In the control device of an air conditioner according to the present invention, the power read by the reading unit may be directly obtained from a power supply control board.
In the control device for an air conditioner according to the present invention, the reading means may read out first power P1 corresponding to first rotation speed V1 of the motor, second power P2 corresponding to second rotation speed V2 of the motor, and third power P3 corresponding to third rotation speed V3 of the motor in a case where the air conditioner is used for the first time under the predetermined condition, and read out first power P1 ' corresponding to first rotation speed V1 of the motor, second power P2 ' corresponding to second rotation speed V2 of the motor, and third power P3 ' corresponding to third rotation speed V3 of the motor in an N-th use of the air conditioner under the predetermined condition, and the rotation speed compensation level determination means may calculate α, β, and γ, respectively, and substitute the calculated α, β, and γ into the rotation speed compensation level determination formula to determine the rotation speed compensation level of the motor, the rotational speed compensation unit adds a rotational speed compensation amount corresponding to the rotational speed compensation level to the rotational speed of the motor, wherein α is P1 '/P1, β is P2 '/P2, γ is P3 '/P3, and V1< V2< V3.
In the control device for an air conditioner according to the present invention, the air conditioner may further include an instruction unit that prompts that the filter screen needs to be cleaned or replaced, and the instruction unit may signal to a user that the filter screen needs to be cleaned or replaced when α is equal to or less than a first threshold value, β is equal to or less than a second threshold value, and γ is equal to or less than a third threshold value.
In the control device for an air conditioner according to the present invention, the rotation speed compensation level determination means may determine the rotation speed compensation level of the motor by comparing α, β, and γ with d, e, and f in the rotation speed compensation level determination equation, respectively, wherein in a rotation speed-power curve of the motor, the rotation speed smaller by Δ V1 than the rotation speed V2 is defined as V21, the rotation speed smaller by Δ V2 than the rotation speed V2 is defined as V22, the rotation speed smaller by Δ V3 than the rotation speed V2 is defined as V23, the power corresponding to the rotation speed V21 is defined as P21, the power corresponding to the rotation speed V22 is defined as P22, the power corresponding to the rotation speed V23 is defined as P23, the rotation speed V1 Δ V2< V3, in which case of d is P21/P2, e is P22/P6, and the rotation speed compensation level determination means determines the rotation speed compensation level of the motor as P38742, the rotation speed compensation amount of the motor is 0, the rotation speed compensation grade judging unit judges that the rotation speed compensation grade of the motor is 1, the rotation speed compensation amount of the motor is Δ V1, the rotation speed compensation grade judging unit judges that the rotation speed compensation grade of the motor is 2, the rotation speed compensation amount of the motor is Δ V2, and the rotation speed compensation grade judging unit judges that the rotation speed compensation grade of the motor is 3, the rotation speed compensation amount of the motor is Δ V3.
In the control device of an air conditioner according to the present invention, the air conditioner may further include an instruction unit that prompts that the filter screen needs to be cleaned or replaced, and the instruction unit may signal to a user that the filter screen needs to be cleaned or replaced when α, β, and γ are all f or less.
A method for controlling an air conditioner according to the present invention is an air conditioner including a fan, a motor for driving the fan, and a filter screen for filtering air sucked into the fan, the method including: a first step of reading, by a reading unit, a plurality of reference powers corresponding to a plurality of rotation speeds of the motor in a case where the air conditioner is used for a first time under a predetermined condition, and a plurality of current powers corresponding to a plurality of rotation speeds of the motor in a case where the air conditioner is used for an nth time under the predetermined condition, respectively; a second step of calculating a ratio of the current power to the reference power at each rotation speed by a rotation speed compensation level determination means, and substituting the calculated ratio into the rotation speed compensation level determination expression to determine a rotation speed compensation level of the motor; and a third step of adding a rotation speed compensation amount corresponding to the rotation speed compensation level to the rotation speed of the motor by using a rotation speed compensation unit, wherein N is a natural number of 2 or more.
In the method of controlling an air conditioner according to the present invention, the first step may be a step of reading a first power P1 corresponding to a first rotation speed V1 of the motor, a second power P2 corresponding to a second rotation speed V2 of the motor, and a third power P3 corresponding to a third rotation speed V3 of the motor, respectively, when the air conditioner is used for the first time under the predetermined condition, and reading a first power P1 ' corresponding to the first rotation speed V1 of the motor, a second power P2 ' corresponding to the second rotation speed V2 of the motor, and a third power P3 ' corresponding to the third rotation speed V3 of the motor, respectively, when the air conditioner is used for the nth time under the predetermined condition, and the second step may be a step of calculating a, β, and γ, respectively, and substituting the calculated a, β, and γ into the rotation speed compensation level determination formula to determine the rotation speed compensation level of the motor, the rotational speed compensation unit adds a rotational speed compensation amount corresponding to the rotational speed compensation level to the rotational speed of the motor, wherein α is P1 '/P1, β is P2 '/P2, γ is P3 '/P3, and V1< V2< V3.
In the method of controlling an air conditioner according to the present invention, the air conditioner may further include an instruction unit that prompts that the filter screen needs to be cleaned or replaced, and the method may further include: and a step in which the instruction section issues a signal to a user that the filter screen needs to be cleaned or replaced when α is equal to or less than a first threshold value, β is equal to or less than a second threshold value, and γ is equal to or less than a third threshold value.
In the method for controlling an air conditioner according to the present invention, in the second step, the rotation speed compensation level of the motor may be determined by comparing α, β, and γ with d, e, and f in the rotation speed compensation level determination equation, respectively, where in a rotation speed-power curve of the motor, a rotation speed smaller by Δ V1 than the rotation speed V2 is defined as V21, a rotation speed smaller by Δ V2 than the rotation speed V2 is defined as V22, a rotation speed smaller by Δ V3 than the rotation speed V2 is defined as V23, a power corresponding to the rotation speed V21 is defined as P21, a power corresponding to the rotation speed V22 is defined as P22, a power corresponding to the rotation speed V23 is defined as P23, a Δ V1 Δ V2< V3, in which case d is P21/P2, e is P22/P6, and a rotation speed compensation level of the motor is determined as P2/460, the motor speed compensation amount is 0, the motor speed compensation level judgment unit judges that the motor speed compensation level is 1, the motor speed compensation amount is delta V1, the motor speed compensation level judgment unit judges that the motor speed compensation level is 2, the motor speed compensation amount is delta V2, and the motor speed compensation level judgment unit judges that the motor speed compensation level is 3, the motor speed compensation amount is delta V3.
In the method for controlling an air conditioner according to the present invention, the air conditioner may further include an instruction unit that prompts that the filter screen needs to be cleaned or replaced, and the method may further include: and a step of signaling the user that the filter screen needs to be cleaned or replaced by the indicating part when the alpha, the beta and the gamma are less than or equal to f.
According to the present invention, it is possible to provide a control device and a control method for an air conditioner capable of reliably compensating for an air volume lost due to clogging of a filter.
Drawings
Fig. 1 is a schematic diagram showing a schematic configuration of a control device of an air conditioner according to the present embodiment.
Fig. 2 is a flowchart showing a control method of the air conditioner according to the present embodiment.
Fig. 3 is a diagram showing a rotation speed compensation level determination formula used in the control device of the air conditioner according to the present embodiment.
Fig. 4 is a graph showing a rotation speed-power curve of the motor.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements will be denoted by the same reference numerals, and redundant description thereof will be omitted.
Fig. 1 is a schematic diagram showing a schematic configuration of a control device of an air conditioner according to the present embodiment. Fig. 2 is a flowchart showing a control method of the air conditioner according to the present embodiment. Fig. 3 is a diagram showing a rotation speed compensation level determination formula used in the control device of the air conditioner according to the present embodiment. Fig. 4 is a graph showing a rotation speed-power curve of the motor.
The air conditioner is the air conditioner that includes the fan, the motor of drive fan and to carrying out the filtered filter screen to the air that inhales the fan, in air conditioner's use, can adhere to dust or oil stain gradually on the filter screen to influence the amount of wind, reduce the efficiency that heats.
In the present embodiment, the motor that drives the fan is preferably a direct current motor (DC motor).
In the present embodiment, as shown in fig. 1, the control device 1 of the air conditioner includes a reading unit 11, a storage unit 12, a rotation speed compensation level determination unit 13, and a rotation speed compensation unit 14.
A rotation speed compensation level decision formula is stored in advance in the storage means 12, the reading means 11 reads out the first power P1 corresponding to the first rotation speed V1 of the motor, the second power P2 corresponding to the second rotation speed V2 of the motor, and the third power P3 corresponding to the third rotation speed V3 of the motor in the case where the air conditioner is used for the first time under the predetermined condition, and reads out the first power P1 ' corresponding to the first rotation speed V1 of the motor, the second power P2 ' corresponding to the second rotation speed V2 of the motor, and the third power P3 ' corresponding to the third rotation speed V3 of the motor in the case where the air conditioner is used for the nth time under the predetermined condition, the rotation speed compensation level decision means 13 calculates α, β, γ, and the calculated rotation speed compensation level decision formula, and the rotation speed compensation level of the motor is obtained by substituting the calculated α, β, γ rotation speed compensation level decision formula, and the rotation speed compensation amount corresponding to the rotation speed of the motor is added by the rotation speed compensation amount corresponding to the rotation speed compensation level of the rotation speed of the motor by the rotation speed compensation unit 14, wherein, N is a natural number of more than 2, alpha is P1 '/P1, beta is P2 '/P2, gamma is P3 '/P3, and V1< V2< V3. Here, the predetermined condition means a condition that the air conditioner is just mounted, the filter screen of the air conditioner is just cleaned, or the filter screen of the air conditioner is just replaced. In the present embodiment, the power (reference power) of the motor at the first use and the power (current power) of the motor at the nth use at 3 speeds are read out, respectively, but the present invention is not limited to this, and the power (reference power) of the motor at the first use and the power (current power) of the motor at the nth use at a plurality of (for example, 2 or 4 or more) speeds may be read out, respectively.
In the present embodiment, the power read by the reading unit 11 is directly obtained from the power control board.
In the present embodiment, the rotation speed compensation level determination formula is obtained in advance through experiments as described below.
In the present embodiment, the air conditioner further includes an instruction unit (e.g., an indicator lamp) that prompts the filter to be cleaned or replaced, and the instruction unit signals to the user that the filter needs to be cleaned or replaced when α is equal to or less than the first threshold, β is equal to or less than the second threshold, and γ is equal to or less than the third threshold.
In the present embodiment, the rotation speed compensation level determination means compares α, β, γ with d, e, f in the rotation speed compensation level determination formula to determine the rotation speed compensation level of the motor, wherein in the rotation speed-power curve of the motor, the rotation speed smaller by Δ V1 than the rotation speed V2 is defined as V21, the rotation speed smaller by Δ V2 than the rotation speed V2 is defined as V22, the rotation speed smaller by Δ V3 than the rotation speed V2 is defined as V23, the power corresponding to the rotation speed V21 is defined as P21, the power corresponding to the rotation speed V22 is defined as P22, the power corresponding to the rotation speed V23 is defined as P23, Δ V1< V2< V3, in which case, d is P21/P2, e is P22/P6, f is P38723/P2, the rotation speed compensation level of the motor is determined as Δ V1, and the rotation speed compensation level determination means determines the rotation speed compensation level of the motor as 0, the rotational speed compensation amount of the motor is Δ V1, the rotational speed compensation level determining unit determines that the rotational speed compensation level of the motor is 2, the rotational speed compensation amount of the motor is Δ V2, and the rotational speed compensation level determining unit determines that the rotational speed compensation level of the motor is 3, the rotational speed compensation amount of the motor is Δ V3.
Specifically, as an example, the reading unit 11 reads and records the powers P1, P2, and P3 of the motors corresponding to the three rotational speeds of the first air conditioner (corresponding to V1, V2, and V3, respectively), and then reads and records the powers P1 ', P2', and P3 'of the motors corresponding to the three rotational speeds of a, B, and C, respectively, each time the air conditioner is operated, and then the powers P1', P2 ', and P3' of the motors obtained each time the operation are performed are all set to cover the powers P1 ', P2', P3 ', and α, P1'/P1, β, P2 '/P2, and γ, P3'/P3 obtained in the previous operation.
When alpha, beta and gamma satisfy a certain condition (details are described below), the corresponding compensation rotating speed is added into the original target rotating speed of the air conditioner, so that the air volume is ensured, and the refrigeration and heating efficiency is ensured.
When α, β, γ satisfy another condition (details are described below), an LED lamp as an indicating section blinks. After the filter screen is cleaned or replaced, the user presses the prompt button. The previously recorded P1, P2, P3 and P1 ', P2 ', P3 ' were all emptied. The next operation is the first operation.
In the present embodiment, the control device directly reads the power consumption of the motor, which is the real power. And thus can be applied to both AC motors and DC motors.
Further, P1, P2, and P3 were retrieved every time the filter screen was cleaned or replaced and during the first operation. Namely, the P1, the P2 and the P3 are a group of dynamic values along with the cleaning or replacement of the filter screen, and errors of consumed power caused by the influence of motor loss caused after long-time operation are avoided.
In addition, the air volume is maintained by compensating the rotating speed, and no loss is caused to the motor.
In addition, all control is completed by the control device, no additional part is needed, the cost is greatly saved, and the failure rate is reduced. In addition, in case of damage, the maintenance is convenient; the parameters to be collected only have the consumed power of the motor, so that the possibility of error is greatly reduced, and the service life of circuit elements is ensured.
In addition to the above-described effects, the following other significant effects are produced with respect to the prior art: after the consumed power is reduced to a certain proportion, the cleaning or the replacement of the filter screen is prompted, the overload operation of the motor is prevented, and the aging and the loss of the motor are delayed to the maximum extent; the compensated rotating speed is obtained from the relation of rotating speed-power (see figure 4) measured in advance by experiments, and the air volume lost due to the blockage of the filter screen can be compensated accurately. The state of optimal heat exchange efficiency is maintained.
The rotation speed range of the air conditioner during normal operation is obtained from the control content of the air conditioner and is A-C, and an intermediate value B of A, C is also obtained.
The air conditioner main body and the motor are evaluated in a rotation speed-power experiment to obtain a rotation speed-power image relation (figure 4). Referring to fig. 4, power P21, power P22, and power P23 corresponding to the respective decreases Δ V1, Δ V2, and Δ V3 are obtained when the B revolution speed V2 is obtained.
Power consumptions P1, P2 and P3 corresponding to three rotation speeds V1, V2 and V3 of A, B and C in the first operation are obtained.
The power consumption P1 ', P2 ', P3 ' of three rotation speeds A, B and C are obtained in the second and later operation, and the last obtained P1 ', P2 ' and P3 ' cover the last obtained P1 ', P2 ' and P3 '.
Let α be P1 '/P1, β be P2 '/P2, γ be P3 '/P3, d be P21/P2, e be P22/P2, and f be P23/P2.
α, β, and γ are determined according to the rotation speed compensation level determination formula shown in fig. 3, and it is determined which level the air conditioner is in.
And for different grades, carrying out rotation speed compensation according to the table 1, and adding the corresponding compensation rotation speed amount into the original target rotation speed.
[ Table 1]
| Grade | Amount of rotation speed compensation of motor for driving |
| 0 | 0 |
| 1 | △V1 |
| 2 | △V2 |
| 3 | △V3 |
When α, β, and γ satisfy a condition where α is equal to or less than a first threshold, β is equal to or less than a second threshold, and γ is equal to or less than a third threshold, it is determined that the clogging of the filter screen is too serious, and the filter screen needs to be cleaned or replaced. At this time, an LED lamp as an indicator blinks.
After the filter screen is cleaned and replaced, a user presses a prompt button. The LED lamps stop flashing, and the P1, P2, P3, P1 ', P2 ' and P3 ' are all emptied. The above operation is repeated in the next operation.
In the present embodiment, it is preferable that the instruction unit issues a signal to the user that the filter net needs to be cleaned or replaced when α, β, and γ are all f or less.
In addition, in the present embodiment, as shown in fig. 2, the method of controlling the air conditioner includes: a first step of reading, with the reading unit 11, a first power P1 corresponding to a first rotation speed V1 of the motor, a second power P2 corresponding to a second rotation speed V2 of the motor, and a third power P3 corresponding to a third rotation speed V3 of the motor, respectively, in a case where the air conditioner is used for the first time after cleaning or replacement of the filter mesh, and reading a first power P1 ' corresponding to the first rotation speed V1 of the motor, a second power P2 ' corresponding to the second rotation speed V2 of the motor, and a third power P3 ' corresponding to the third rotation speed V3 of the motor, respectively, in a case where the air conditioner is used for the nth time after cleaning or replacement of the filter mesh; a second step of calculating α, β, and γ by the rotation speed compensation level determination means 13, and substituting the calculated α, β, and γ into the rotation speed compensation level determination formula stored in the storage means 12 in advance to determine the rotation speed compensation level of the motor; and a third step of adding a rotation speed compensation amount corresponding to the rotation speed compensation level to the rotation speed of the motor by the rotation speed compensation unit 14, wherein N is a natural number of 2 or more, α is P1 '/P1, β is P2 '/P2, γ is P3 '/P3, and V1< V2< V3.
According to the present invention, when the ratio of the power consumption of the motor in the specific 3-rpm operation to the power consumption of the same rpm in the initial operation is in a different level, the target rpm is added with a corresponding offset to keep the air volume constant. When the ratio of the power consumption in the specific 3-rpm operation to the power consumption in the same rpm in the initial operation is too low, the indication unit indicates that the filter screen needs to be cleaned or replaced. The first operation after the filter screen is cleaned or replaced is the first operation of the next round. Thus, the air volume lost by the clogging of the filter screen can be reliably compensated
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. Modifications and variations may be effected by those skilled in the art, as desired, without departing from the true spirit and scope of the invention. Such modifications and variations are intended to be within the scope of the present invention.
Claims (10)
1. A control device of an air conditioner is characterized in that,
is a control device of an air conditioner comprising a fan, a motor for driving the fan, and a filter screen for filtering air sucked into the fan,
the control device comprises a reading unit, a storage unit, a rotating speed compensation grade judging unit and a rotating speed compensation unit,
a rotational speed compensation level decision formula is stored in the storage means in advance,
the readout unit reads out a first power P1 corresponding to a first rotation speed V1 of the motor, a second power P2 corresponding to a second rotation speed V2 of the motor, and a third power P3 corresponding to a third rotation speed V3 of the motor in a case where the air conditioner is used for the first time under a predetermined condition, and reads out a first power P1 ' corresponding to the first rotation speed V1 of the motor, a second power P2 ' corresponding to the second rotation speed V2 of the motor, and a third power P3 ' corresponding to the third rotation speed V3 of the motor in an nth use of the air conditioner under the predetermined condition, respectively, the rotation speed compensation level determination unit calculates α, β, and γ, and substitutes the calculated α, β, and γ into the rotation speed compensation level determination formula to determine a rotation speed compensation level of the motor, and the rotation speed compensation amount corresponding to the rotation speed compensation level is added to the rotation speed of the motor Wherein α = P1 '/P1, β = P2 '/P2, γ = P3 '/P3, V1< V2< V3, N is a natural number of 2 or more,
the rotational speed compensation level determination means compares α, β, γ with d, e, f in the rotational speed compensation level determination formula to determine the rotational speed compensation level of the motor, wherein in a rotational speed-power curve of the motor, a rotational speed smaller than a rotational speed V2 by Δ V1 is defined as V21, a rotational speed smaller than a rotational speed V2 by Δ V2 is defined as V22, a rotational speed smaller than a rotational speed V2 by Δ V3 is defined as V23, a power corresponding to a rotational speed V21 is defined as P21, a power corresponding to a rotational speed V22 is defined as P22, a power corresponding to a rotational speed V23 is defined as P23, Δ V1< V2< V3, in which case, d = P21/P2, e = P22/P2, f = P23/P2,
the rotation speed compensation level determination means determines the rotation speed compensation level of the motor such that the rotation speed compensation amount of the motor is 0 when any one of α, β, and γ is larger than d, Δ V1 when any one of α, β, and γ is equal to or smaller than d and is larger than e, Δ V2 when any one of α, β, and γ is smaller than e and is larger than f, and Δ V3 when any one of α, β, and γ is equal to or smaller than f.
2. The control device of an air conditioner according to claim 1,
the motor driving the fan is a dc motor.
3. The control device of the air conditioner according to claim 1,
the power read by the reading unit is directly obtained from the power supply control board.
4. The control device of the air conditioner according to claim 1,
the air conditioner also comprises an indicating part for prompting that the filter screen needs to be cleaned or replaced,
the indicating section signals to a user that the filter net needs to be cleaned or replaced when α is equal to or less than a first threshold value, β is equal to or less than a second threshold value, and γ is equal to or less than a third threshold value.
5. The control device of an air conditioner according to claim 1,
the motor control device comprises a motor, a rotating speed compensation grade judging unit and a rotating speed compensation grade judging unit, wherein the rotating speed compensation grade judging unit judges that the rotating speed compensation grade of the motor is 0, the rotating speed compensation quantity of the motor is 0, the rotating speed compensation grade judging unit judges that the rotating speed compensation grade of the motor is 1, the rotating speed compensation quantity of the motor is delta V1, the rotating speed compensation grade judging unit judges that the rotating speed compensation grade of the motor is 2, the rotating speed compensation quantity of the motor is delta V2, and the rotating speed compensation grade judging unit judges that the rotating speed compensation grade of the motor is 3, and the rotating speed compensation quantity of the motor is delta V3.
6. The control device of an air conditioner according to claim 1,
the air conditioner also comprises an indicating part for prompting that the filter screen needs to be cleaned or replaced,
when alpha, beta and gamma are below f, the indicating part sends a signal to the user that the filter screen needs to be cleaned or replaced.
7. A control method of an air conditioner is characterized in that,
is a control method of an air conditioner including a fan, a motor for driving the fan, and a filter screen for filtering air sucked into the fan,
the method comprises the following steps:
a first step of reading, with a reading unit, a first power P1 corresponding to a first rotation speed V1 of the motor, a second power P2 corresponding to a second rotation speed V2 of the motor, and a third power P3 corresponding to a third rotation speed V3 of the motor in a case where the air conditioner is used for the first time under a prescribed condition, and reading a first power P1 ' corresponding to the first rotation speed V1 of the motor, a second power P2 ' corresponding to the second rotation speed V2 of the motor, and a third power P3 ' corresponding to the third rotation speed V3 of the motor in a case where the air conditioner is used for the nth time under the prescribed condition, respectively;
a second step of calculating α, β, and γ by a rotational speed compensation level determination means, and comparing the calculated α, β, and γ with d, e, and f in the rotational speed compensation level determination equation, respectively, to determine a rotational speed compensation level of the motor; and
a third step of adding a rotation speed compensation amount corresponding to the rotation speed compensation level to the rotation speed of the motor by using a rotation speed compensation unit,
wherein N is a natural number of 2 or more, α = P1 '/P1, β = P1 '/P1, γ = P1 '/P1, V1< V1, a rotation speed smaller than V1 by Δ V1 is defined as V1, a rotation speed smaller than V1 is defined as V1, a power corresponding to V1 is defined as P1, a Δ V1 is defined as Δ 1, in this case, d = P1/P1, e = P1/P1, f = P1/P1,
the rotation speed compensation level determination means determines the rotation speed compensation level of the motor such that the rotation speed compensation amount of the motor is 0 when any one of α, β, and γ is larger than d, Δ V1 when any one of α, β, and γ is equal to or smaller than d and is larger than e, Δ V2 when any one of α, β, and γ is smaller than e and is larger than f, and Δ V3 when any one of α, β, and γ is equal to or smaller than f.
8. The control method of an air conditioner according to claim 7,
the air conditioner also comprises an indicating part for prompting that the filter screen needs to be cleaned or replaced,
the control method further comprises the following steps: and a step in which the instruction section issues a signal to a user that the filter screen needs to be cleaned or replaced when α is equal to or less than a first threshold value, β is equal to or less than a second threshold value, and γ is equal to or less than a third threshold value.
9. The control method of an air conditioner according to claim 7,
the motor control device comprises a motor, a rotating speed compensation grade judging unit and a rotating speed compensation grade judging unit, wherein the rotating speed compensation grade judging unit judges that the rotating speed compensation grade of the motor is 0, the rotating speed compensation quantity of the motor is 0, the rotating speed compensation grade judging unit judges that the rotating speed compensation grade of the motor is 1, the rotating speed compensation quantity of the motor is delta V1, the rotating speed compensation grade judging unit judges that the rotating speed compensation grade of the motor is 2, the rotating speed compensation quantity of the motor is delta V2, and the rotating speed compensation grade judging unit judges that the rotating speed compensation grade of the motor is 3, and the rotating speed compensation quantity of the motor is delta V3.
10. The control method of an air conditioner according to claim 7,
the air conditioner also comprises an indicating part for prompting that the filter screen needs to be cleaned or replaced,
the control method further comprises the following steps: and a step of signaling the user that the filter screen needs to be cleaned or replaced by the indicating part when the alpha, the beta and the gamma are less than or equal to f.
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