CN110296509B

CN110296509B - Rotating speed control method and device, storage medium and air conditioner

Info

Publication number: CN110296509B
Application number: CN201910590150.5A
Authority: CN
Inventors: 杨桐; 杜佳; 黎乔钦; 黄廉惠; 田涛; 刘超
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-11-24
Anticipated expiration: 2039-07-02
Also published as: CN110296509A

Abstract

The invention discloses a rotating speed control method, a rotating speed control device, a storage medium and an air conditioner, wherein the method comprises the following steps: determining the current liquid level height of a water tank in the water fetching motor; determining a theoretical target rotating speed of the water fetching motor according to the current liquid level height; and determining the current target rotating speed of the water fetching motor based on the theoretical target rotating speed and by combining the current environment temperature of the air conditioner to which the water fetching motor belongs or the current evaporator temperature of the air conditioner to which the water fetching motor belongs, and controlling the water fetching motor to operate according to the current target rotating speed. According to the scheme provided by the invention, the problem of low control precision of the water fetching motor can be solved, and the effect of improving the control precision of the water fetching motor is achieved.

Description

Rotating speed control method and device, storage medium and air conditioner

Technical Field

The invention belongs to the technical field of air conditioners, and particularly relates to a rotating speed control method and device, a storage medium and an air conditioner, in particular to a method and device for self-adaptive adjustment of the rotating speed of the air conditioner, the storage medium and the air conditioner.

Background

The mobile air conditioner can produce a certain amount of condensed water in the refrigerating process, and in the process of closed-loop treatment of the condensed water, a water pumping motor (namely a motor device which can spray water in a water tank to raise water through a flywheel and other devices) can be used for spraying the water onto the condenser to accelerate heat exchange, so that the energy efficiency is improved, and the shutdown caused by quick accumulation of the condensed water is avoided.

The single-gear or multi-gear water beating motor is adopted in the market at present, the liquid level is simply judged through a liquid level switch to be controlled to start and stop, or the environment temperature and humidity is directly subjected to fuzzy control, so that the accurate control cannot be achieved. For example: the liquid level switch can not accurately detect the liquid level height, only can distinguish 1-2 liquid level heights, and the motor can only switch the fixed rotating speed between different liquid levels.

The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.

Disclosure of Invention

The invention aims to provide a rotating speed control method, a rotating speed control device, a storage medium and an air conditioner, aiming at overcoming the problem of low control precision of a water pumping motor and achieving the effect of improving the control precision of the water pumping motor.

The invention provides a rotating speed control method, which comprises the following steps: determining the current liquid level height of a water tank in the water fetching motor; determining a theoretical target rotating speed of the water fetching motor according to the current liquid level height; and determining the current target rotating speed of the water fetching motor based on the theoretical target rotating speed and by combining the current environment temperature of the air conditioner to which the water fetching motor belongs or the current evaporator temperature of the air conditioner to which the water fetching motor belongs, and controlling the water fetching motor to operate according to the current target rotating speed.

Optionally, determining a current liquid level height of a water tank in the water beating motor comprises: controlling the water fetching motor to drive with a constant driving signal or a constant torque output mode for a set time, and then obtaining a rotating speed feedback signal of the water fetching motor; determining the current rotating speed of the water fetching motor according to the rotating speed feedback signal; determining the target running time of the water fetching motor from the current rotating speed to the target rotating speed based on the current rotating speed; under a constant driving signal or constant torque output mode, determining the current liquid level height according to the current rotating speed and the target operation time based on the corresponding relation among the set liquid level height, the set rotating speed and the set operation time; or determining the input power change rate or the input current change rate of the water beating motor; and determining the current liquid level height according to the input power change rate or the input current change rate on the basis of the corresponding relation between the set liquid level height and the set power change rate or the set current change rate.

Optionally, determining a theoretical target rotation speed of the water fetching motor comprises: determining whether the current liquid level height is lower than a preset lowest liquid level or higher than a preset highest liquid level; if the current liquid level is lower than the preset lowest liquid level, controlling the water pumping motor to stop or operate at the preset lowest rotating speed; if the current liquid level is higher than the preset highest liquid level, controlling the water pumping motor to operate at the preset highest rotating speed; and if the current liquid level height is between the preset minimum liquid level and the preset maximum liquid level, determining the theoretical target rotating speed according to the echelon grading relation between the set liquid level height and the set target rotating speed or the functional relation between the set liquid level height and the set target rotating speed.

Optionally, determining the current target rotation speed of the water beating motor comprises: acquiring the current evaporator temperature of an air conditioner to which a water pumping motor belongs, and acquiring the current environment temperature of the air conditioner to which the water pumping motor belongs; determining a first temperature difference between the current ambient temperature and the current evaporator temperature; determining a current rotation speed compensation value according to the corresponding relation between the set temperature difference and the set rotation speed compensation value and by combining the current working condition of the air conditioner; under the condition that the current working condition of the air conditioner reaches the expected target, the current rotating speed compensation value is 0; under the condition that the current working condition of the air conditioner does not reach the expected target and a lifting space exists, the smaller the first temperature difference is, the larger the current rotating speed compensation value is, and/or the higher the current environment temperature is, the larger the current rotating speed compensation value is; compensating the theoretical target rotating speed according to the current rotating speed compensation value to obtain a current target rotating speed; or acquiring the current evaporator temperature of the air conditioner to which the water pumping motor belongs; determining whether the current evaporator temperature is greater than a preset temperature; if the current evaporator temperature is higher than the preset temperature, compensating the theoretical target rotating speed according to a second temperature difference between the current evaporator temperature and the preset temperature to obtain a current target rotating speed; and if the current evaporator temperature is less than or equal to the preset temperature, controlling the water pumping motor to stop or operate according to the preset minimum rotating speed.

Optionally, the method further comprises: and after controlling the water fetching motor to operate for a second set time according to the current target rotating speed, re-determining the current liquid level height of the water tank in the water fetching motor.

In accordance with another aspect of the present invention, there is provided a rotation speed control apparatus, including: the determining unit is used for determining the current liquid level height of a water tank in the water fetching motor; the determining unit is further used for determining a theoretical target rotating speed of the water pumping motor according to the current liquid level height; and the control unit is used for determining the current target rotating speed of the water fetching motor based on the theoretical target rotating speed and by combining the current environment temperature of the air conditioner to which the water fetching motor belongs or the current evaporator temperature of the air conditioner to which the water fetching motor belongs, and controlling the water fetching motor to operate according to the current target rotating speed.

Optionally, the determining unit determines a current liquid level height of a water tank in the water beating motor, and includes: controlling the water fetching motor to drive with a constant driving signal or a constant torque output mode for a set time, and then obtaining a rotating speed feedback signal of the water fetching motor; determining the current rotating speed of the water fetching motor according to the rotating speed feedback signal; determining the target running time of the water fetching motor from the current rotating speed to the target rotating speed based on the current rotating speed; under a constant driving signal or constant torque output mode, determining the current liquid level height according to the current rotating speed and the target operation time based on the corresponding relation among the set liquid level height, the set rotating speed and the set operation time; or determining the input power change rate or the input current change rate of the water beating motor; and determining the current liquid level height according to the input power change rate or the input current change rate on the basis of the corresponding relation between the set liquid level height and the set power change rate or the set current change rate.

Optionally, the determining unit determines a theoretical target rotation speed of the water fetching motor, and includes: determining whether the current liquid level height is lower than a preset lowest liquid level or higher than a preset highest liquid level; if the current liquid level is lower than the preset lowest liquid level, controlling the water pumping motor to stop or operate at the preset lowest rotating speed; if the current liquid level is higher than the preset highest liquid level, controlling the water pumping motor to operate at the preset highest rotating speed; and if the current liquid level height is between the preset minimum liquid level and the preset maximum liquid level, determining the theoretical target rotating speed according to the echelon grading relation between the set liquid level height and the set target rotating speed or the functional relation between the set liquid level height and the set target rotating speed.

Optionally, the determining, by the control unit, a current target rotation speed of the water fetching motor includes: acquiring the current evaporator temperature of an air conditioner to which a water pumping motor belongs, and acquiring the current environment temperature of the air conditioner to which the water pumping motor belongs; determining a first temperature difference between the current ambient temperature and the current evaporator temperature; determining a current rotation speed compensation value according to the corresponding relation between the set temperature difference and the set rotation speed compensation value and by combining the current working condition of the air conditioner; under the condition that the current working condition of the air conditioner reaches the expected target, the current rotating speed compensation value is 0; under the condition that the current working condition of the air conditioner does not reach the expected target and a lifting space exists, the smaller the first temperature difference is, the larger the current rotating speed compensation value is, and/or the higher the current environment temperature is, the larger the current rotating speed compensation value is; compensating the theoretical target rotating speed according to the current rotating speed compensation value to obtain a current target rotating speed; or acquiring the current evaporator temperature of the air conditioner to which the water pumping motor belongs; determining whether the current evaporator temperature is greater than a preset temperature; if the current evaporator temperature is higher than the preset temperature, compensating the theoretical target rotating speed according to a second temperature difference between the current evaporator temperature and the preset temperature to obtain a current target rotating speed; and if the current evaporator temperature is less than or equal to the preset temperature, controlling the water pumping motor to stop or operate according to the preset minimum rotating speed.

Optionally, the method further comprises: and the determining unit is further used for re-determining the current liquid level height of the water tank in the water fetching motor after controlling the water fetching motor to operate for a second set time length according to the current target rotating speed so as to adjust the current target rotating speed according to the re-determined current liquid level height.

In accordance with another aspect of the present invention, there is provided an air conditioner including: the rotational speed control device described above.

In accordance with the above method, a further aspect of the present invention provides a storage medium comprising: the storage medium has stored therein a plurality of instructions; the plurality of instructions are used for loading and executing the rotating speed control method by the processor.

In accordance with the above method, another aspect of the present invention provides an air conditioner, comprising: a processor for executing a plurality of instructions; a memory to store a plurality of instructions; the plurality of instructions are stored by the memory, and loaded and executed by the processor to perform the above-mentioned rotating speed control method.

According to the scheme, the damping received by the motor is judged by utilizing the driving signal and the rotating speed feedback signal of the water pumping motor, the liquid level height in the current water tank (water tank) is determined, the determination mode is simple and convenient, and the determination result is accurate.

Furthermore, according to the scheme of the invention, the current rotating speed of the water pumping motor is comprehensively determined according to the current liquid level height and the current evaporator temperature, so that the self-adaptive adjustment of the water pumping motor is realized, the control precision of the water pumping motor can be improved, and the water pumping effect is favorably improved.

Furthermore, according to the scheme of the invention, the damping magnitude of the motor is judged by utilizing the driving signal and the rotating speed feedback signal of the water pumping motor, and the liquid level height in the current water tank (water tank) is determined; meanwhile, the current rotating speed of the water pumping motor is comprehensively determined according to the current evaporator temperature, so that the self-adaptive adjustment of the water pumping motor is realized, the control precision is high, and the operation is reliable and safe.

Furthermore, according to the scheme of the invention, the self-adaptive accurate control of the rotating speed of the water pumping motor is realized through the accurate control of the motor drive and a special liquid level detection algorithm on the premise of not increasing a sensor, the spraying amount of condensed water is accurately controlled, and the water pumping effect is ensured.

Furthermore, according to the scheme of the invention, through the accurate control of motor drive and a special liquid level detection algorithm, the self-adaptive accurate control of the rotating speed of the water pumping motor is realized, the condition that the whole machine is shut down in a water-full state too fast is avoided, stable energy efficiency fluctuation is achieved, the whole machine is enabled to operate efficiently and stably, the reliability of the whole machine is improved, and the operation power consumption of the whole machine is reduced.

Therefore, according to the scheme of the invention, the damping magnitude of the motor is judged by utilizing the driving signal and the rotating speed feedback signal of the water pumping motor, and the current liquid level height is determined; meanwhile, the current rotating speed of the water pumping motor is comprehensively determined according to the current evaporator temperature, so that the self-adaptive adjustment of the water pumping motor is realized, the problem of low control precision of the water pumping motor can be solved, the control precision of the water pumping motor is improved, and the operation reliability and safety of the water pumping motor are also improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

FIG. 1 is a flow chart illustrating a method for controlling a rotational speed according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart illustrating an embodiment of determining a current liquid level height based on a correspondence between a set liquid level height, a set rotational speed, and a set operating time in the method of the present invention;

FIG. 3 is a schematic flow chart illustrating one embodiment of determining a current liquid level height based on a correspondence between a set liquid level height and a set power rate of change or a set current rate of change in the method of the present invention;

FIG. 4 is a schematic flow chart illustrating one embodiment of determining a theoretical target rotational speed of the water-fetching motor in the method of the present invention;

FIG. 5 is a schematic flow chart illustrating one embodiment of the method of the present invention for compensating the rotational speed by the temperature difference between the ambient temperature and the tube temperature;

FIG. 6 is a schematic flow chart illustrating an embodiment of the method for compensating the rotational speed by the temperature difference between the tube temperature and the standard temperature;

FIG. 7 is a schematic structural diagram of a rotational speed control apparatus according to an embodiment of the present invention;

FIG. 8 is a schematic view illustrating a liquid level detection process of a water pumping motor according to an embodiment of the air conditioner of the present invention;

fig. 9 is a schematic flow chart illustrating a self-adaptive rotation speed control process of a water pumping motor according to an embodiment of the air conditioner of the present invention.

The reference numbers in the embodiments of the present invention are as follows, in combination with the accompanying drawings:

102-a determination unit; 104-control unit.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

According to an embodiment of the present invention, a method for controlling a rotational speed is provided, as shown in fig. 1, which is a schematic flow chart of an embodiment of the method of the present invention. The rotational speed control method may include: step S110 to step S130.

At step S110, a current level height of a water tank in the water beating motor is determined. For example: and under the condition of constant driving of the water fetching motor, determining the current liquid level height of a water tank in the water fetching motor. The constant driving of the water beating motor can comprise the following steps: the water beating motor is driven by a constant driving signal in an analog open-loop mode, or the driving mode of the water beating motor is adjusted to be a constant torque output mode.

Optionally, the determination of the current liquid level height of the water tank in the water fetching motor in step S110 may include any one of the following determination manners.

The first determination method: the current liquid level height is determined based on a correspondence between the set liquid level height, the set rotational speed, and the set operating time.

Referring to the flow chart of an embodiment of determining the current liquid level height based on the corresponding relationship between the set liquid level height, the set rotation speed and the set operation time in the method of the present invention shown in fig. 2, a specific process of determining the current liquid level height based on the corresponding relationship between the set liquid level height, the set rotation speed and the set operation time will be further described, and may include: step S210 to step S240.

And step S210, controlling the water fetching motor to drive with a constant driving signal or a constant torque output mode for a set time, and then obtaining a rotating speed feedback signal of the water fetching motor.

And step S220, determining the current rotating speed of the water fetching motor according to the rotating speed feedback signal.

And step S230, determining the target running time of the water beating motor from the current rotating speed to the target rotating speed based on the current rotating speed.

Step S240, in a constant driving signal or constant torque output mode, determining the current liquid level height according to the current rotation speed and the target operation time based on the corresponding relationship between the set liquid level height, the set rotation speed, and the set operation time. For example: the current liquid level height is resolved, for example: the total height of the water tank is H, when the liquid level height is 1/3H, the rotating speed of the motor is increased from 100r/min to 1000r/min for 0.5s, when the liquid level height is 2/3H, the same driving calculation mode is used, when the motor reaches 1000r/min, 2.5s is needed, and the current liquid level height can be known in a similar mode. For another example: for example: when the water pumping motor idles, the test rotating speed is required to be 0.5s when the water pumping motor reaches 800r/min, the test rotating speed is required to be 2s when the liquid level is 50% of the height, and the like, and the current liquid level height is calculated through rotating speed feedback time.

Therefore, the current liquid level height is determined based on the corresponding relation among the set liquid level height, the set rotating speed and the set running time, and the determination result is accurate and reliable.

The second determination method is as follows: the current liquid level height is determined based on a correspondence between the set liquid level height and the set power change rate or the set current change rate.

Referring to the flow chart of an embodiment of determining the current liquid level height based on the corresponding relationship between the set liquid level height and the set power change rate or the set current change rate in the method of the present invention shown in fig. 3, a specific process of determining the current liquid level height based on the corresponding relationship between the set liquid level height and the set power change rate or the set current change rate will be further described, which may include: step S310 and step S320.

And step S310, determining the input power change rate or the input current change rate of the water beating motor.

Step S320, based on the corresponding relationship between the set liquid level height and the set power change rate or the set current change rate, determining the current liquid level height according to the input power change rate or the input current change rate. For example: in the scheme of detecting the liquid level height by controlling the motor, the liquid level can be measured by measuring and calculating the input power change or the input current change of the motor to obtain the corresponding relation between the corresponding liquid level height and the power change rate or the current change rate.

Of course, determining the current liquid level height of the water tank in the water pumping motor may also include: and controlling the water fetching motor to drive with a constant driving signal or a constant torque output mode for a set time length, and then obtaining a rotating speed feedback signal of the water fetching motor. And determining the rotation speed change rate of the water fetching motor according to the rotation speed feedback signal, and further determining the water resistance condition of the flywheel of the water fetching motor (for example, determining the water resistance condition of the flywheel of the water fetching motor according to the rotation speed change rate). And calculating the current liquid level according to the water resistance condition. The fluid internal friction resistance F is in direct proportion to the speed difference u between the fluid layers, in direct proportion to the contact area between the two layers and in inverse proportion to the vertical distance y between the two layers. Therefore, the higher the liquid level of the flywheel (i.e. the larger the contact area of the flywheel and water) and the higher the rotating speed of the flywheel during the rotation process, the higher the resistance of the flywheel. For example: the motor is driven by adjusting the motor, the motor is driven by a constant driving signal in an analog open-loop mode (or the driving mode is adjusted to be a constant torque output mode), the rotating speed change speed of the motor is calculated by a feedback signal within set time, the size of the water resistance borne by the flywheel is obtained, and the current liquid level height in the water tank (or the water tank) is calculated.

Or, determining the current liquid level height of the water tank in the water pumping motor may also include: the magnetic field change condition of the motor is detected, the feedback signal of the motor outputs corresponding PWM square wave signals, namely, the square wave signals with set number can be detected when the motor rotates for one circle, the number of the square waves detected in unit time is calculated, and the rotating speed of the motor can be determined. For example: calculating the motor speed may include: the motor capable of realizing stepless speed regulation has a rotating speed feedback signal, and the current rotating speed of the motor can be obtained through a calculation formula corresponding to the motor. Such as: the general motor detects the change condition of a magnetic field through a Hall element, a feedback signal outputs a corresponding PWM square wave signal, namely 12 square wave signals can be detected when the motor rotates for one circle, the number of the detected square waves in unit time is calculated, and the rotating speed of the motor can be determined.

Therefore, the current liquid level height is determined based on the corresponding relation between the set liquid level height and the set power change rate or the set current change rate, the determination mode is simple and convenient, and the determination result is reliable.

And at the step S120, determining a theoretical target rotating speed of the water fetching motor according to the current liquid level height.

Optionally, a specific process of determining the theoretical target rotation speed of the water fetching motor in step S120 may be further described with reference to a schematic flow chart of an embodiment of determining the theoretical target rotation speed of the water fetching motor in the method of the present invention shown in fig. 4, and may include: step S410 to step S440.

Step S410, determining whether the current liquid level height is lower than a preset minimum liquid level or higher than a preset maximum liquid level.

Step S420, if the current liquid level is lower than the preset minimum liquid level, controlling the water pumping motor to stop or operate at the preset minimum rotation speed, that is, the zero rotation speed or the preset minimum rotation speed is used as the theoretical target rotation speed, so as to solve the problem of no water idling of the water pumping motor. For example: in the refrigeration mode, the theoretical target rotating speed V0 of the water pumping motor is calculated according to the liquid level height h calculated by the water pumping motor, and if the calculated liquid level height h is not enough to spray through a flywheel, the water pumping motor stops or operates at the minimum operating speed. Such as: when the current liquid level is lower than 5% of the liquid level height, the water pumping motor stops or runs at the minimum rotating speed. For another example: when the water level is lower than 1/5H, the target rotation speed is properly reduced to 800r/min in order to maintain the stable operation of the refrigerating system as much as possible.

And step S430, if the current liquid level is higher than the preset maximum liquid level, controlling the water pumping motor to operate at the preset maximum rotating speed, namely, using the preset maximum rotating speed as a theoretical target rotating speed. For example: in the refrigeration mode, the theoretical target rotating speed V0 of the water pumping motor is calculated according to the liquid level height h calculated by the water pumping motor, and if the calculated liquid level height h is higher than the preset liquid level h1, the water pumping motor runs at the maximum running speed. Such as: the total height of the water tank is H, and when the water level is higher than 4/5H, in order to avoid full water fault, the rotating speed of the motor needs to be increased, so that the full power of the motor runs at 2000 r/min.

Step S440, if the current liquid level height is between the preset minimum liquid level and the preset maximum liquid level, determining a theoretical target rotating speed according to a gradient grading relation between the set liquid level height and the set target rotating speed or a functional relation between the set liquid level height and the set target rotating speed, and solving the problem of rotating speed fluctuation caused by liquid level height change on the premise of not adding a sensor. For example: and under the refrigeration mode, calculating the theoretical target rotating speed V0 of the water pumping motor according to the liquid level height h calculated by the water pumping motor. And if the theoretical target rotating speed is between 4/5H and 1/5H, carrying out gradient grading or calculating according to a corresponding function relation of the theoretical target rotating speed and the liquid level height to obtain the theoretical target rotating speed. The corresponding functional relation may be various, such as: v0 ═ k × h + b (k, b constant coefficients), and so on.

Therefore, the theoretical target rotating speed of the water beating motor is determined based on the relation between the current liquid level height and the preset liquid level which is lower than the preset minimum liquid level, and the preset maximum liquid level, so that the theoretical target rotating speed of the water beating motor can be determined according to different situations of the current liquid level height, the determination of the theoretical target rotating speed of the water beating motor is more accurate, and the operation safety of the water beating motor is guaranteed.

In step S130, based on the theoretical target rotation speed, and in combination with the current ambient temperature of the air conditioner to which the water fetching motor belongs or the current evaporator temperature of the air conditioner to which the water fetching motor belongs, the current target rotation speed of the water fetching motor is determined, and the water fetching motor is controlled to operate according to the current target rotation speed.

For example: a method for self-adaptive regulation of the rotation speed of an air conditioner is provided, wherein the damping magnitude of a motor is judged by utilizing a driving signal and a rotation speed feedback signal of a water pumping motor, and the current liquid level height in a water tank (water tank) is determined. Meanwhile, the current rotating speed of the water pumping motor is comprehensively determined according to the current evaporator temperature, so that the self-adaptive adjustment of the water pumping motor is realized, and the problem of low control precision of the water pumping motor can be solved.

For another example: through the accurate control of motor drive and a special liquid level detection algorithm, on the premise of not increasing a sensor, the self-adaptive accurate control of the rotating speed of the water pumping motor is realized, the spraying amount of condensed water is accurately controlled, the condition that the whole machine is shut down completely due to excessive water is avoided, the stable energy efficiency fluctuation is achieved, the whole machine operates efficiently and stably, the reliability of the whole machine is improved, and the operation power consumption of the whole machine is reduced.

Therefore, the current target rotating speed of the water pumping motor is determined by combining the current environment temperature of the air conditioner or the current evaporator temperature based on the current liquid level height of the water tank in the water pumping motor, and the water pumping motor is controlled to operate according to the current target rotating speed, so that the control precision of the water pumping motor can be improved, and the operation reliability and the safety of the water pumping motor are improved.

Alternatively, the determination of the current target rotation speed of the water beating motor in step S130 may include any one of the following determination conditions.

The first determination case: the rotational speed compensation is carried out through the temperature difference between the ring temperature and the tube temperature, for example: the rotation speed control can carry out rotation speed compensation through the temperature difference between the environment temperature and the tube temperature.

The following further describes a specific process of performing the rotational speed compensation by the temperature difference between the ring temperature and the tube temperature with reference to a flow diagram of an embodiment of performing the rotational speed compensation by the temperature difference between the ring temperature and the tube temperature in the method of the present invention shown in fig. 5, which may include: step S510 to step S540.

Step S510, obtaining the current evaporator temperature of the air conditioner to which the water fetching motor belongs, and obtaining the current environment temperature of the air conditioner to which the water fetching motor belongs.

Step S520, determining a first temperature difference between the current ambient temperature and the current evaporator temperature.

Step S530, determining a current rotation speed compensation value according to the corresponding relation between the set temperature difference and the set rotation speed compensation value and by combining the current working condition of the air conditioner; under the condition that the current working condition of the air conditioner reaches the expected target, the current rotating speed compensation value is 0; and under the condition that the current working condition of the air conditioner does not reach the expected target and a lifting space exists, the smaller the first temperature difference is, the larger the current rotating speed compensation value is, and/or the higher the current environment temperature is, the larger the current rotating speed compensation value is.

And S540, compensating the theoretical target rotating speed according to the current rotating speed compensation value to obtain the current target rotating speed.

Therefore, the rotation speed compensation is carried out through the temperature difference between the ring temperature and the tube temperature, so that the compensation treatment of the rotation speed is simple, convenient and reliable.

Second determination case: and compensating the rotating speed through the temperature difference between the tube temperature and the standard temperature.

Referring to fig. 6, a flow diagram of an embodiment of performing rotation speed compensation by using a temperature difference between a tube temperature and a standard temperature in the method of the present invention is further described, where the specific process of performing rotation speed compensation by using a temperature difference between a tube temperature and a standard temperature may include: step S610 to step S640.

And step S610, acquiring the current evaporator temperature of the air conditioner to which the water pumping motor belongs.

Step S620, determining whether the current evaporator temperature is greater than a preset temperature.

Step S630, if the current evaporator temperature is greater than the preset temperature, compensating the theoretical target rotation speed according to a second temperature difference between the current evaporator temperature and the preset temperature to obtain a current target rotation speed. For example: and if the evaporator temperature Tg is greater than T0, calculating a difference value delta T between the evaporator temperature Tg and a preset temperature T1, and performing speed compensation V1 on the theoretical target speed according to the delta T to obtain the final target speed Vout. Such as: and if the current liquid level is 50% of the liquid level height, theoretically judging that the theoretical target rotating speed is 1100r/min, the current evaporator temperature is 11 ℃, the difference value delta T between the current evaporator temperature and the preset temperature of 5 ℃ is 6 ℃, correspondingly compensating the rotating speed to be +100, and finally judging that the target rotating speed is 1200 r/min.

And step S640, if the current evaporator temperature is less than or equal to the preset temperature, controlling the water pumping motor to stop or operate according to a preset minimum rotating speed, namely, taking the zero rotating speed or the preset minimum rotating speed as the current target rotating speed. For example: and measuring the current evaporator temperature Tg, and judging whether the evaporator temperature Tg is greater than a preset temperature T0. And if the evaporator temperature Tg is less than T0, judging that the water fetching motor stops or operates at the minimum operation speed, and avoiding the shutdown caused by frequent freezing of the evaporator. Such as: when the temperature of the evaporator is lower than 0 ℃, the water-fetching motor stops or runs at the minimum rotating speed.

From this, carry out rotational speed compensation through the difference in temperature between pipe temperature and the standard temperature, the compensation result is accurate, reliable, is favorable to promoting the effect of fetching water the motor.

In an alternative embodiment, the method may further include: and after controlling the water fetching motor to operate for a second set time according to the current target rotating speed, re-determining the current liquid level height of the water tank in the water fetching motor.

For example: and measuring the current evaporator temperature Tg, and judging whether the evaporator temperature Tg is greater than a preset temperature T0. If the evaporator temperature Tg is greater than T0, calculating a difference value delta T between the calculated difference value and a preset temperature T1, performing rotating speed compensation V1 on a theoretical target rotating speed according to the delta T to obtain a final target rotating speed Vout, and controlling the rotating speed of the water pumping motor by taking the Vout as a reference; and the rotational speed is redetected and determined every interval preset time t 1. Such as: and if the current liquid level is 50% of the liquid level height, theoretically judging that the theoretical target rotating speed is 1100r/min, the current evaporator temperature is 11 ℃, the difference value delta T between the current evaporator temperature and the preset temperature 5 ℃ is 6 ℃, correspondingly compensating the rotating speed to be +100, and finally detecting the liquid level height by liquid level detection logic every 2min to adjust the final target rotating speed, wherein the final target rotating speed is 1200 r/min.

Therefore, the current target rotating speed is adjusted based on the current liquid level height of the water tank at regular time, the accuracy and the reliability of adjustment of the current target rotating speed can be improved, and the water fetching effect is improved under the condition that the operation of the water fetching motor is reliable and safe.

Through a large amount of experimental verifications, adopt the technical scheme of this embodiment, through utilizing the motor drive signal of fetching water and rotational speed feedback signal, judge the damping size that the motor received, confirm the liquid level height in the current water tank (basin), the definite mode is simple and convenient and the definite result is accurate.

According to an embodiment of the present invention, there is also provided a rotation speed control apparatus corresponding to the rotation speed control method. Referring to fig. 7, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The rotational speed control apparatus may include: a determination unit 102 and a control unit 104.

In an alternative example, the determination unit 102 may be configured to determine a current level of a water tank in the water pumping motor. For example: and under the condition of constant driving of the water fetching motor, determining the current liquid level height of a water tank in the water fetching motor. The constant driving of the water beating motor can comprise the following steps: the water beating motor is driven by a constant driving signal in an analog open-loop mode, or the driving mode of the water beating motor is adjusted to be a constant torque output mode. The specific function and processing of the determination unit 102 are referred to in step S110.

Optionally, the determining unit 102 may determine the current liquid level height of the water tank in the water fetching motor, and may include any one of the following determining manners, specifically, the following manners:

The determining unit 102 may be further configured to obtain a rotation speed feedback signal of the water fetching motor after the water fetching motor is driven by the constant driving signal or driven by the constant torque output mode for a set time period. The specific function and processing of the determination unit 102 are also referred to in step S210.

The determining unit 102 may be further configured to determine a current rotation speed of the water fetching motor according to the rotation speed feedback signal. The specific function and processing of the determination unit 102 are also referred to in step S220.

The determining unit 102 may be further configured to determine a target operation time of the water fetching motor from the current rotation speed to the target rotation speed based on the current rotation speed. The specific function and processing of the determination unit 102 are also referred to in step S230.

The determining unit 102 may be further specifically configured to determine the current liquid level height according to the current rotation speed and the target operation time based on a corresponding relationship between a set liquid level height, a set rotation speed, and a set operation time in a constant driving signal or constant torque output mode. The specific function and processing of the determination unit 102 are also referred to step S240. For example: the current liquid level height is resolved, for example: the total height of the water tank is H, when the liquid level height is 1/3H, the rotating speed of the motor is increased from 100r/min to 1000r/min for 0.5s, when the liquid level height is 2/3H, the same driving calculation mode is used, when the motor reaches 1000r/min, 2.5s is needed, and the current liquid level height can be known in a similar mode. For another example: for example: when the water pumping motor idles, the test rotating speed is required to be 0.5s when the water pumping motor reaches 800r/min, the test rotating speed is required to be 2s when the liquid level is 50% of the height, and the like, and the current liquid level height is calculated through rotating speed feedback time.

The second determination method is as follows: determining the current liquid level height based on the corresponding relationship between the set liquid level height and the set power change rate or the set current change rate, which may be specifically as follows:

the determining unit 102 may be further configured to determine a rate of change of input power or a rate of change of input current of the water pumping motor. The specific function and processing of the determination unit 102 are also referred to in step S310.

The determining unit 102 may be further specifically configured to determine the current liquid level height according to the input power change rate or the input current change rate based on a corresponding relationship between a set liquid level height and a set power change rate or a set current change rate. The specific function and processing of the determination unit 102 are also referred to in step S320. For example: in the scheme of detecting the liquid level height by controlling the motor, the liquid level can be measured by measuring and calculating the input power change or the input current change of the motor to obtain the corresponding relation between the corresponding liquid level height and the power change rate or the current change rate.

In an optional example, the determining unit 102 may be further configured to determine a theoretical target rotation speed of the water pumping motor according to the current liquid level height. The specific function and processing of the determination unit 102 are also referred to in step S120.

Optionally, the determining unit 102 determines the theoretical target rotation speed of the water fetching motor, and may include:

the determining unit 102 may be further configured to determine whether the current liquid level is lower than a preset minimum liquid level or higher than a preset maximum liquid level. The specific function and processing of the determination unit 102 are also referred to in step S410.

The determining unit 102 may be further specifically configured to control the water pumping motor to stop or operate at a preset minimum rotation speed if the current liquid level is lower than the preset minimum liquid level, that is, a zero rotation speed or a preset minimum rotation speed is used as a theoretical target rotation speed, so that the problem that the water pumping motor runs idle when no water exists is solved. The specific function and processing of the determination unit 102 are also referred to step S420. For example: in the refrigeration mode, the theoretical target rotating speed V0 of the water pumping motor is calculated according to the liquid level height h calculated by the water pumping motor, and if the calculated liquid level height h is not enough to spray through a flywheel, the water pumping motor stops or operates at the minimum operating speed. Such as: when the current liquid level is lower than 5% of the liquid level height, the water pumping motor stops or runs at the minimum rotating speed. For another example: when the water level is lower than 1/5H, the target rotation speed is properly reduced to 800r/min in order to maintain the stable operation of the refrigerating system as much as possible.

The determining unit 102 may be further specifically configured to control the water pumping motor to operate at a preset maximum rotation speed if the current liquid level is higher than a preset maximum liquid level, that is, the preset maximum rotation speed is used as a theoretical target rotation speed. The specific function and processing of the determination unit 102 are also referred to in step S430. For example: in the refrigeration mode, the theoretical target rotating speed V0 of the water pumping motor is calculated according to the liquid level height h calculated by the water pumping motor, and if the calculated liquid level height h is higher than the preset liquid level h1, the water pumping motor runs at the maximum running speed. Such as: the total height of the water tank is H, and when the water level is higher than 4/5H, in order to avoid full water fault, the rotating speed of the motor needs to be increased, so that the full power of the motor runs at 2000 r/min.

The determining unit 102 may be further specifically configured to determine the theoretical target rotation speed according to a step classification relationship between the set liquid level height and the set target rotation speed or a functional relationship between the set liquid level height and the set target rotation speed if the current liquid level height is between the preset minimum liquid level and the preset maximum liquid level, and solve the problem of rotation speed fluctuation caused by liquid level height change without adding a sensor. The specific function and processing of the determination unit 102 are also referred to in step S440. For example: and under the refrigeration mode, calculating the theoretical target rotating speed V0 of the water pumping motor according to the liquid level height h calculated by the water pumping motor. And if the theoretical target rotating speed is between 4/5H and 1/5H, carrying out gradient grading or calculating according to a corresponding function relation of the theoretical target rotating speed and the liquid level height to obtain the theoretical target rotating speed. The corresponding functional relation may be various, such as: v0 ═ k × h + b (k, b constant coefficients), and so on.

In an optional example, the control unit 104 may be configured to determine a current target rotation speed of the water fetching motor based on the theoretical target rotation speed and in combination with a current ambient temperature of an air conditioner to which the water fetching motor belongs or a current evaporator temperature of the air conditioner to which the water fetching motor belongs, and control the water fetching motor to operate according to the current target rotation speed. The specific function and processing of the control unit 104 are also referred to in step S130.

Alternatively, the control unit 104 determines the current target rotation speed of the water beating motor, and any one of the following determination conditions may be included.

The first determination case: the rotational speed compensation is carried out through the temperature difference between the ring temperature and the tube temperature, for example: the rotating speed control can carry out rotating speed compensation through the temperature difference between the ring temperature and the pipe temperature, and specifically can be as follows:

the control unit 104 may be further configured to obtain a current evaporator temperature of an air conditioner to which the water pumping motor belongs, and obtain a current ambient temperature of the air conditioner to which the water pumping motor belongs. The specific functions and processes of the control unit 104 are also referred to in step S510.

The control unit 104 may be further configured to determine a first temperature difference between the current ambient temperature and the current evaporator temperature. The specific functions and processes of the control unit 104 are also referred to in step S520.

The control unit 104 may be further configured to determine a current rotation speed compensation value according to a correspondence between a set temperature difference and a set rotation speed compensation value and by combining a current working condition of the air conditioner; under the condition that the current working condition of the air conditioner reaches the expected target, the current rotating speed compensation value is 0; and under the condition that the current working condition of the air conditioner does not reach the expected target and a lifting space exists, the smaller the first temperature difference is, the larger the current rotating speed compensation value is, and/or the higher the current environment temperature is, the larger the current rotating speed compensation value is. The specific functions and processes of the control unit 104 are also referred to in step S530.

The control unit 104 may be further configured to compensate the theoretical target rotation speed according to the current rotation speed compensation value, so as to obtain a current target rotation speed. The specific functions and processes of the control unit 104 are also referred to in step S540.

Second determination case: the rotation speed compensation is carried out through the temperature difference between the tube temperature and the standard temperature, and the rotation speed compensation method specifically comprises the following steps:

the control unit 104 may be further configured to obtain a current evaporator temperature of an air conditioner to which the water pumping motor belongs. The specific functions and processes of the control unit 104 are also referred to in step S610.

The control unit 104 may be further configured to determine whether the current evaporator temperature is greater than a preset temperature. The specific functions and processes of the control unit 104 are also referred to in step S620.

The control unit 104 may be further specifically configured to compensate the theoretical target rotation speed according to a second temperature difference between the current evaporator temperature and the preset temperature if the current evaporator temperature is greater than the preset temperature, so as to obtain the current target rotation speed. The specific function and processing of the control unit 104 are also referred to in step S630. For example: and if the evaporator temperature Tg is greater than T0, calculating a difference value delta T between the evaporator temperature Tg and a preset temperature T1, and performing speed compensation V1 on the theoretical target speed according to the delta T to obtain the final target speed Vout. Such as: and if the current liquid level is 50% of the liquid level height, theoretically judging that the theoretical target rotating speed is 1100r/min, the current evaporator temperature is 11 ℃, the difference value delta T between the current evaporator temperature and the preset temperature of 5 ℃ is 6 ℃, correspondingly compensating the rotating speed to be +100, and finally judging that the target rotating speed is 1200 r/min.

The control unit 104 may be further configured to control the water pumping motor to stop or operate at a preset minimum rotation speed if the current evaporator temperature is less than or equal to the preset temperature, that is, a zero rotation speed or a preset minimum rotation speed is used as the current target rotation speed. The specific functions and processes of the control unit 104 are also referred to in step S640. For example: and measuring the current evaporator temperature Tg, and judging whether the evaporator temperature Tg is greater than a preset temperature T0. And if the evaporator temperature Tg is less than T0, judging that the water fetching motor stops or operates at the minimum operation speed, and avoiding the shutdown caused by frequent freezing of the evaporator. Such as: when the temperature of the evaporator is lower than 0 ℃, the water-fetching motor stops or runs at the minimum rotating speed.

In an alternative embodiment, the method may further include: the determining unit 102 may be further configured to, after controlling the water fetching motor to operate for a second set time period according to the current target rotation speed, re-determine the current liquid level height of the water tank in the water fetching motor, so as to adjust the current target rotation speed according to the re-determined current liquid level height.

Since the processes and functions implemented by the apparatus of this embodiment substantially correspond to the embodiments, principles and examples of the method shown in fig. 1 to fig. 6, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the invention comprehensively determines the current rotating speed of the water pumping motor according to the current liquid level height and the current evaporator temperature, realizes the self-adaptive adjustment of the water pumping motor, can improve the control precision of the water pumping motor, and is favorable for improving the water pumping effect.

According to an embodiment of the invention, an air conditioner corresponding to the rotation speed control device is also provided. The air conditioner may include: the rotational speed control device described above.

In an optional embodiment, the scheme of the invention provides a method for adaptively adjusting the rotating speed of an air conditioner, which judges the damping of a motor by utilizing a driving signal and a rotating speed feedback signal of a water pumping motor, and determines the current liquid level height in a water tank (water tank); meanwhile, the current rotating speed of the water pumping motor is comprehensively determined according to the current evaporator temperature, so that the self-adaptive adjustment of the water pumping motor is realized, and the problem of low control precision of the water pumping motor can be solved.

Optionally, the scheme of the invention solves the problem that the water pumping motor runs idle without water.

The water-free idling of the water-beating motor is realized because the liquid level height cannot be accurately obtained in real time, and the water-beating motor can start to operate after a compressor is started in a refrigeration mode, so that the water-beating motor still operates when no water exists in a water tank.

Optionally, the scheme of the invention solves the problem of rotation speed fluctuation caused by liquid level height change on the premise of not increasing a sensor.

Wherein, general motor (especially alternating current motor) because receive the resistance difference, can direct influence motor rotational speed, because the liquid level is dynamic change in the basin, so lead to the fluctuation of motor rotational speed, can influence the effect of fetching water.

Optionally, the solution of the present invention solves the problem of frequent freeze shutdowns during refrigeration due to too low evaporator temperature.

Therefore, according to the scheme of the invention, the self-adaptive accurate control of the rotating speed of the water pumping motor is realized and the spraying amount of condensed water is accurately controlled by the accurate control of the motor drive and a special liquid level detection algorithm on the premise of not increasing a sensor, so that the over-fast full water shutdown of the whole machine is avoided, the stable energy efficiency fluctuation is achieved, the efficient and stable operation of the whole machine is realized, the reliability of the whole machine is improved, and the operation power consumption of the whole machine is reduced.

In an alternative embodiment, reference may be made to the examples shown in fig. 8 and 9 to illustrate specific implementation procedures of the scheme of the present invention.

In an alternative embodiment, the process of detecting the liquid level of the water pumping motor can be seen in an example shown in fig. 8.

The detection principle of the detection control of the water level of the water pumping motor is exemplarily explained below.

The watering spray assembly may generally comprise: the motor, the control drive circuit, the flywheel and the water tank (or the water tank) are formed, and according to the viscous characteristic of fluid in fluid mechanics, the resistance of the fluid for condensed water meets the following characteristics:

F∝(du/dy)A

that is, the internal friction resistance F of the fluid is in direct proportion to the speed difference u between the fluid layers, in direct proportion to the contact area between the two layers and in inverse proportion to the vertical distance y between the two layers. Therefore, the higher the liquid level of the flywheel (i.e. the larger the contact area of the flywheel and water) and the higher the rotating speed of the flywheel during the rotation process, the higher the resistance of the flywheel.

As shown in fig. 8, in the solution of the present invention, the motor is driven by adjusting the motor, the motor drives the motor in an analog open-loop manner to obtain a constant driving signal (or adjust the driving mode to be a constant torque output mode), and the rotation speed variation speed of the motor is calculated by the feedback signal within a set time, so as to obtain the water resistance of the flywheel, thereby calculating the current liquid level height in the water tank (or the water tank).

In fig. 8, calculating the motor speed may include: the motor capable of realizing stepless speed regulation has a rotating speed feedback signal, and the current rotating speed of the motor can be obtained through a calculation formula corresponding to the motor. Such as: the general motor detects the change condition of a magnetic field through a Hall element, a feedback signal outputs a corresponding PWM square wave signal, namely 12 square wave signals can be detected when the motor rotates for one circle, the number of the detected square waves in unit time is calculated, and the rotating speed of the motor can be determined.

In fig. 8, the current level height is resolved, for example: the total height of the water tank is H, when the liquid level height is 1/3H, the rotating speed of the motor is increased from 100r/min to 1000r/min for 0.5s, when the liquid level height is 2/3H, the same driving calculation mode is used, when the motor reaches 1000r/min, 2.5s is needed, and the current liquid level height can be known in a similar mode.

Due to the influence of factors such as motor structure, motor driving mode and the like, the liquid level height and the time are not in a linear relation, but the relation between the liquid level height and the rotating speed change can be quantitatively tested and calculated by the theory.

For example: when the water pumping motor idles, the test rotating speed is required to be 0.5s when the water pumping motor reaches 800r/min, the test rotating speed is required to be 2s when the liquid level is 50% of the height, and the like, and the current liquid level height is calculated through rotating speed feedback time.

In an alternative embodiment, in the scheme of detecting the liquid level height by motor control, the liquid level may also be measured by measuring and calculating the input power change or the input current change of the motor to obtain the corresponding relationship between the corresponding liquid level height and the power change rate or the current change rate.

Wherein, because the liquid level height is different, the resistance of liquid to the motor is big or small different, and the motor of fetching water is in order to maintain a certain target rotational speed, and then the output of motor is different. That is, when the rotation speed ω is constant, the output power P and the motor driving force F have a positive correlation (P ∞ F). The input voltage and the input current of the motor are measured and calculated through an additional circuit, the input power P of the motor is obtained, and the corresponding liquid level height is obtained through different powers.

For example: under the condition that the rotating speed omega of the same water pumping motor is 1000 r/min: during idling, the power obtained by detection and calculation is 2.0W; when the water level is half of the height, the power obtained by detection and calculation is 3.0W; when the water level is close to the full water level, the power obtained by detection and calculation is 4.5W.

In addition, because the input voltage of the motor is constant, and the input power P of the motor is in direct proportion to the input current I, the corresponding liquid level height can be obtained by different powers or currents.

For example: under the condition that the rotating speed omega of the same water pumping motor is 1000 r/min: during idling, the current value obtained by detection and calculation is 160 mA; when the water level is half of the height, the power obtained by detection and calculation is 250 mA; when the water level is close to the full water level height, the power obtained by detection and calculation is 370 mA.

In an alternative embodiment, the adaptive speed control process of the water beating motor may be as shown in fig. 9.

The principle of compensation during the control of the rotational speed of the water pumping motor will be explained in the following.

In a refrigeration mode, the condensate water is sprayed to the condenser, so that the heat exchange of the condenser is facilitated, the more the condensate water is sprayed, the more the heat exchange is facilitated, and according to the law of thermodynamics, the temperature of the evaporator is reduced at the same time, so that the refrigeration is facilitated to be carried out more quickly; meanwhile, if the temperature of the evaporator is close to 0 ℃, the evaporator is easy to freeze and block, and the operation of the whole machine is not facilitated.

Wherein, the spraying water quantity of the condenser is in direct proportion to the rotating speed of the water fetching motor.

As shown in fig. 9, in the solution of the present invention, in the cooling mode, the theoretical target rotation speed V0 of the pumping motor is calculated according to the liquid level height h calculated by the pumping motor, and if the calculated liquid level height h is not enough to spray through the flywheel, the pumping motor is stopped or operated at the minimum operation speed; and if the calculated liquid level height h is higher than the preset liquid level h1, the water fetching motor runs at the maximum running speed.

Wherein the aim to be achieved is different at different liquid level heights.

For example: the total height of the water tank is H, and when the water level is higher than 4/5H, in order to avoid full water fault, the rotating speed of the motor needs to be increased, so that the full power of the motor runs at 2000 r/min.

For example: when the water level is lower than 1/5H, the target rotation speed is properly reduced to 800r/min in order to maintain the stable operation of the refrigerating system as much as possible.

For example: and if the theoretical target rotating speed is between 4/5H and 1/5H, carrying out gradient grading or calculating according to a corresponding function relation of the theoretical target rotating speed and the liquid level height to obtain the theoretical target rotating speed. The corresponding functional relation may be various, such as: v0 ═ k × h + b (k, b constant coefficients), and so on.

Meanwhile, measuring the current evaporator temperature Tg, and judging whether the evaporator temperature Tg is greater than a preset temperature T0; if the temperature Tg of the evaporator is less than T0, the water fetching motor is judged to stop or run at the minimum running speed, and the shutdown caused by frequent freezing of the evaporator is avoided; if the evaporator temperature Tg is greater than T0, calculating a difference value delta T between the calculated difference value and a preset temperature T1, performing rotating speed compensation V1 on a theoretical target rotating speed according to the delta T to obtain a final target rotating speed Vout, and controlling the rotating speed of the water pumping motor by taking the Vout as a reference; and the rotational speed is redetected and determined every interval preset time t 1.

For example: when the current liquid level is lower than 5% of the liquid level height, the water pumping motor stops or runs at the minimum rotating speed.

For example: when the temperature of the evaporator is lower than 0 ℃, the water-fetching motor stops or runs at the minimum rotating speed.

For example: and if the current liquid level is 50% of the liquid level height, theoretically judging that the theoretical target rotating speed is 1100r/min, the current evaporator temperature is 11 ℃, the difference value delta T between the current evaporator temperature and the preset temperature 5 ℃ is 6 ℃, correspondingly compensating the rotating speed to be +100, and finally detecting the liquid level height by liquid level detection logic every 2min to adjust the final target rotating speed, wherein the final target rotating speed is 1200 r/min.

In an alternative embodiment, the speed control may be speed compensated by the difference between the loop temperature and the tube temperature.

According to the thermodynamic principle, the larger the temperature difference between the environment temperature and the tube temperature is, the better the heat exchange performance of the air conditioning system is, and the higher the energy efficiency is, so that the current environment temperature is judged simultaneously through the temperature difference between the environment temperature and the tube temperature, the compensation on the rotating speed is comprehensively judged, and the smaller the temperature difference is, the larger the compensation value is, and the larger the compensation is.

For example: the ring temperature is 30 ℃, the tube temperature is 10 ℃, the temperature difference is 20 ℃, and the compensation rotation speed is + 10. Under the condition that the current working condition does not reach the expected target and the lifting space exists, the rotating speed compensation can be carried out according to the expected target.

For example: the ring temperature is 30 ℃, the tube temperature is 15 ℃, the temperature difference is 15 ℃, and the compensation rotating speed is + 100.

For example: the ring temperature is 25 ℃, the tube temperature is 5 ℃, the temperature difference is 20 ℃, and the compensation rotating speed is 0. In the case where the current operating conditions have reached the desired target, no speed compensation may be performed.

For example: the ring temperature is 25 ℃, the tube temperature is 10 ℃, the temperature difference is 15 ℃, and the compensation rotation speed is + 50.

Since the processing and functions of the water-fetching motor of this embodiment are basically corresponding to the embodiment, principle and example of the device shown in fig. 7, the description of this embodiment is not given in detail, and reference may be made to the related description in the foregoing embodiment, which is not described herein again.

Through a large number of tests, the technical scheme of the invention is adopted, and the damping magnitude of the motor is judged by utilizing the driving signal and the rotating speed feedback signal of the water pumping motor, so that the liquid level height in the current water tank (water tank) is determined; meanwhile, the current rotating speed of the water pumping motor is comprehensively determined according to the current evaporator temperature, so that the self-adaptive adjustment of the water pumping motor is realized, the control precision is high, and the operation is reliable and safe.

According to an embodiment of the present invention, there is also provided a storage medium corresponding to the rotation speed control method. The storage medium may include: the storage medium has stored therein a plurality of instructions; the plurality of instructions are used for loading and executing the rotating speed control method by the processor.

Since the processing and functions implemented by the storage medium of this embodiment substantially correspond to the embodiments, principles, and examples of the methods shown in fig. 1 to fig. 6, details are not described in the description of this embodiment, and reference may be made to the related descriptions in the foregoing embodiments, which are not described herein again.

Through a large number of tests, the technical scheme of the invention realizes the self-adaptive accurate control of the rotating speed of the water pumping motor, accurately controls the spraying amount of condensed water and ensures the water pumping effect on the premise of not increasing a sensor by the accurate control of the motor drive and a special liquid level detection algorithm.

According to an embodiment of the invention, an air conditioner corresponding to the rotating speed control method is also provided. The air conditioner may include: a processor for executing a plurality of instructions; a memory to store a plurality of instructions; the plurality of instructions are stored by the memory, and loaded and executed by the processor to perform the above-mentioned rotating speed control method.

Since the processing and functions of the water-fetching motor of this embodiment are basically corresponding to the embodiments, principles and examples of the methods shown in fig. 1 to fig. 6, the description of this embodiment is not detailed, and reference may be made to the related descriptions in the foregoing embodiments, which are not repeated herein.

Through a large number of tests, the technical scheme of the invention realizes the self-adaptive accurate control of the rotating speed of the water pumping motor through the accurate control of motor drive and a special liquid level detection algorithm, thereby not only avoiding the over-fast water-full shutdown of the whole machine, but also achieving stable energy efficiency fluctuation, enabling the whole machine to operate efficiently and stably, improving the reliability of the whole machine and reducing the operation power consumption of the whole machine.

In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.

The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A rotational speed control method characterized by comprising:

determining the current liquid level height of a water tank in the water fetching motor;

determining a theoretical target rotating speed of the water fetching motor according to the current liquid level height;

based on the theoretical target rotating speed, determining the current target rotating speed of the water fetching motor by combining the current environment temperature of the air conditioner to which the water fetching motor belongs or the current evaporator temperature of the air conditioner to which the water fetching motor belongs, and controlling the water fetching motor to operate according to the current target rotating speed;

judging the damping received by the motor by using a driving signal and a rotating speed feedback signal of the water pumping motor, and determining the current liquid level height; meanwhile, the current rotating speed of the water fetching motor is comprehensively determined according to the current evaporator temperature, and the self-adaptive adjustment of the water fetching motor is realized.

2. The method of claim 1, wherein,

confirm the current liquid level height of water tank in the motor of fetching water, include:

controlling the water fetching motor to drive with a constant driving signal or a constant torque output mode for a set time, and then obtaining a rotating speed feedback signal of the water fetching motor;

determining the current rotating speed of the water fetching motor according to the rotating speed feedback signal;

determining the target running time of the water fetching motor from the current rotating speed to the target rotating speed based on the current rotating speed;

under a constant driving signal or constant torque output mode, determining the current liquid level height according to the current rotating speed and the target operation time based on the corresponding relation among the set liquid level height, the set rotating speed and the set operation time;

or,

determining the input power change rate or the input current change rate of the water pumping motor;

based on the corresponding relation between the set liquid level height and the set power change rate or the set current change rate, carrying out liquid level measurement and calculation according to the input power change rate or the input current change rate, and determining the current liquid level height;

and/or the presence of a gas in the gas,

determining a theoretical target rotating speed of the water fetching motor, comprising:

determining whether the current liquid level height is lower than a preset lowest liquid level or higher than a preset highest liquid level;

if the current liquid level is lower than the preset lowest liquid level, controlling the water pumping motor to stop or operate at the preset lowest rotating speed;

if the current liquid level is higher than the preset highest liquid level, controlling the water pumping motor to operate at the preset highest rotating speed;

and if the current liquid level height is between the preset minimum liquid level and the preset maximum liquid level, determining the theoretical target rotating speed according to the echelon grading relation between the set liquid level height and the set target rotating speed or the functional relation between the set liquid level height and the set target rotating speed.

3. The method of claim 1, wherein determining a current target rotational speed of a water break motor comprises:

acquiring the current evaporator temperature of an air conditioner to which a water pumping motor belongs, and acquiring the current environment temperature of the air conditioner to which the water pumping motor belongs;

determining a first temperature difference between the current ambient temperature and the current evaporator temperature;

determining a current rotation speed compensation value according to the corresponding relation between the set temperature difference and the set rotation speed compensation value and by combining the current working condition of the air conditioner; under the condition that the current working condition of the air conditioner reaches the expected target, the current rotating speed compensation value is 0; under the condition that the current working condition of the air conditioner does not reach the expected target and a lifting space exists, the smaller the first temperature difference is, the larger the current rotating speed compensation value is, and/or the higher the current environment temperature is, the larger the current rotating speed compensation value is;

compensating the theoretical target rotating speed according to the current rotating speed compensation value to obtain a current target rotating speed;

or,

acquiring the current evaporator temperature of an air conditioner to which a water pumping motor belongs;

determining whether the current evaporator temperature is greater than a preset temperature;

if the current evaporator temperature is higher than the preset temperature, compensating the theoretical target rotating speed according to a second temperature difference between the current evaporator temperature and the preset temperature to obtain a current target rotating speed;

and if the current evaporator temperature is less than or equal to the preset temperature, controlling the water pumping motor to stop or operate according to the preset minimum rotating speed.

4. The method of any one of claims 1-3, further comprising:

and after controlling the water fetching motor to operate for a second set time according to the current target rotating speed, re-determining the current liquid level height of the water tank in the water fetching motor.

5. A rotational speed control apparatus, characterized by comprising:

the determining unit is used for determining the current liquid level height of a water tank in the water fetching motor;

the determining unit is further used for determining a theoretical target rotating speed of the water pumping motor according to the current liquid level height;

the control unit is used for determining the current target rotating speed of the water fetching motor based on the theoretical target rotating speed and by combining the current environment temperature of the air conditioner to which the water fetching motor belongs or the current evaporator temperature of the air conditioner to which the water fetching motor belongs, and controlling the water fetching motor to operate according to the current target rotating speed;

6. The apparatus of claim 5, wherein,

the determining unit determines the current liquid level height of a water tank in the water pumping motor, and comprises the following steps:

or,

and/or the presence of a gas in the gas,

the determining unit determines a theoretical target rotating speed of the water fetching motor, and comprises the following steps:

7. The apparatus of claim 5, wherein the control unit determines a current target rotational speed of a water beating motor, comprising:

or,

8. The apparatus of any of claims 5-7, further comprising:

and the determining unit is further used for re-determining the current liquid level height of the water tank in the water fetching motor after controlling the water fetching motor to operate for a second set time length according to the current target rotating speed so as to adjust the current target rotating speed according to the re-determined current liquid level height.

9. An air conditioner, comprising: a rotational speed control apparatus according to any one of claims 5 to 8;

or,

a processor for executing a plurality of instructions;

a memory to store a plurality of instructions;

wherein the instructions are stored by the memory and loaded by the processor to perform the method of any of claims 1-4.

10. A storage medium having a plurality of instructions stored therein; the plurality of instructions for being loaded by a processor and executing the speed control method according to any one of claims 1-4.