A control method and device for a heat pump variable frequency unit

Abstract

This invention relates to the field of heat pump control technology, and discloses a control method and device for a heat pump inverter unit. The heat pump inverter unit is pre-configured with multiple noise levels and corresponding set ambient temperature ranges, and each noise level is configured with control parameters for controlling the heat pump inverter unit. The method includes: receiving a noise command carrying the set noise level; if the current ambient temperature is within the set ambient temperature range corresponding to the set noise level, then the set noise level is used as the target noise level; if the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, then the target noise level is determined based on the matching relationship between the current ambient temperature and the set ambient temperature ranges corresponding to the remaining noise levels, and the heat pump inverter unit is controlled to operate based on the target control parameters corresponding to the target noise level. Therefore, while ensuring the heating capacity of the heat pump unit, the device is controlled to enter a quiet mode to the maximum extent, significantly improving the user experience.

Description

Technical Field

[0001] This invention relates to the field of heat pump control technology, and specifically to a control method and device for a heat pump variable frequency unit. Background Technology

[0002] Heat pump heating units are commonly used heating equipment. The silent mode function effectively improves the user experience. However, in related technologies, the silent mode usually reduces the speed of the fan and compressor through a single speed limiting strategy. When the ambient temperature is low and the heat pump inverter unit needs to provide higher power to ensure the performance of the equipment, it cannot effectively switch to silent mode. Summary of the Invention The first technical problem solved by this invention is to provide a control method for a heat pump inverter unit, which can maximize the control of the equipment to enter the silent mode while ensuring the heating capacity of the heat pump unit, thereby meeting the user's demand for quiet operation and significantly improving the user experience.

[0003] The second technical problem solved by this invention is to provide a control device for a heat pump inverter unit that can maximize the control of the equipment to enter a silent mode while ensuring the heating capacity of the heat pump unit, thereby meeting the user's demand for quiet operation and significantly improving the user experience.

[0004] The first technical problem mentioned above is solved by the following technical solution: A control method for a heat pump inverter unit, wherein the heat pump inverter unit is pre-configured with multiple noise levels, each noise level is configured with a corresponding set ambient temperature range, and each noise level is configured with control parameters for controlling the heat pump inverter unit. The method includes: Receive the silence command from the heat pump inverter unit; the silence command carries the setting of the silence level. Obtain the current ambient temperature of the heat pump inverter unit; If the current ambient temperature is within the set ambient temperature range corresponding to the set noise level, the set noise level will be used as the target noise level, and the heat pump inverter unit will be controlled to operate based on the target control parameters corresponding to the target noise level. If the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, the target noise level is determined based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining noise levels, and the heat pump inverter unit is controlled to operate based on the target control parameters corresponding to the target noise level.

[0005] The control method for a heat pump inverter unit described in this invention has the following advantages compared with the prior art: The control method for a heat pump inverter unit of the present invention pre-configures multiple noise levels for the heat pump inverter unit, assigns a corresponding set ambient temperature range to each noise level, and configures control parameters for controlling the heat pump inverter unit for each noise level. Therefore, upon receiving a noise command from the heat pump inverter unit, the method first obtains the current ambient temperature of the heat pump inverter unit. Based on the current ambient temperature and the user's set noise level, it prioritizes determining whether the current ambient temperature falls within the set ambient temperature range corresponding to the set noise level. If it does, the unit enters the set noise level; otherwise, it determines a noise level as the target noise level based on the matching relationship between the current ambient temperature and the set ambient temperature ranges corresponding to the remaining noise levels, and controls the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level. This maximizes the control of the equipment into quiet mode while ensuring the heating capacity of the heat pump unit, meeting the user's demand for quiet operation and significantly improving the user experience.

[0006] In some alternative implementations, the higher the quietness level, the lower the upper limit of the noise range allowed by the quietness level, and the larger the minimum set environment range for switching to the quietness level. The target noise level is determined based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining noise level, including: The system sequentially checks whether the current ambient temperature matches the set ambient temperature range corresponding to a quietness level one level lower than the set quietness level, until the quietness level corresponding to the set ambient temperature range that matches the current ambient temperature is determined as the target quietness level.

[0007] In some alternative implementations, the control parameters corresponding to the quietness level are determined based on the noise range allowed by the quietness level; The set ambient temperature range corresponding to the noise level is determined based on the heating capacity that the heat pump inverter unit can achieve when operating with the control parameters corresponding to the noise level.

[0008] In some optional implementations, the target control parameters include the minimum set fan speed and the maximum set fan speed for the heat pump inverter unit at the target noise level, wherein the maximum set fan speed is greater than the minimum set fan speed. The heat pump inverter unit is controlled to operate based on target control parameters corresponding to the target noise level, including: Based on the current ambient temperature, the maximum set fan speed, the pre-configured low temperature threshold of the heat pump inverter unit, and the minimum value of the set environment range for switching to the silent level, calculate the fan speed correction value. Calculate the target fan speed of the heat pump inverter unit based on the fan speed correction value and the minimum fan speed limit of the heat pump inverter unit. The fan of the heat pump inverter unit is controlled to operate based on the target fan speed. Among them, the target speed of the fan is greater than the minimum set wind speed of the fan and less than the maximum set wind speed of the fan.

[0009] In some optional implementations, a fan speed correction value is calculated based on the current ambient temperature, the maximum set fan speed, the pre-configured low-temperature threshold of the heat pump inverter unit, and the minimum value of the set environmental range for switching to the silent level, including: The fan speed correction value is obtained using the following formula;

[0010] This indicates the fan speed correction value; This indicates the maximum set wind speed for the fan; Indicates the current ambient temperature; This indicates the minimum value within the set environment range for switching to the silent level; This indicates the pre-configured low-temperature threshold of the heat pump inverter unit, which is set based on the control strategy that triggers low-temperature related operations by the heat pump inverter unit.

[0011] In some optional implementations, the target fan speed of the heat pump inverter unit is calculated based on the fan speed correction value and the heat pump inverter unit, including: The target fan speed of the heat pump inverter unit is calculated using the following formula:

[0012] in, Indicates the target rotational speed; This indicates the minimum fan speed limit of the heat pump inverter unit, which is a preset fixed value; This indicates the maximum set wind speed for the fan; Indicates the current ambient temperature; This indicates the minimum value within the set environment range for switching to the silent level; This indicates the pre-configured low temperature threshold of the heat pump inverter unit, which is set based on the control strategy that triggers low temperature-related operations by the heat pump inverter unit. This indicates the fan speed correction value.

[0013] In some alternative implementations, after controlling the fan of the heat pump inverter unit to operate based on the target fan speed, controlling the heat pump inverter unit to operate based on target control parameters corresponding to the target noise level further includes: When the target speed of the fan is greater than the maximum set wind speed of the fan, the heat pump inverter unit is controlled to exit the silent mode.

[0014] In some optional implementations, the target control parameters include the minimum and maximum compressor setting frequencies for the heat pump inverter unit at the target noise level, wherein the maximum compressor setting frequency is greater than the minimum compressor setting frequency. Controlling the heat pump inverter unit to operate based on target control parameters corresponding to the target noise level also includes: The PID algorithm is used to regulate the frequency of the compressor in the heat pump inverter unit, with the compressor's minimum set frequency, maximum set frequency, and pre-set frequency compensation coefficient as the algorithm target parameters.

[0015] In some alternative implementations, after controlling the heat pump inverter unit to operate based on target control parameters corresponding to the target noise level, the method further includes: If the heat pump inverter unit is detected to be in defrost mode, then when the heat pump inverter unit switches to heating mode, the heat pump inverter unit will be controlled to run at the maximum fan speed corresponding to the target noise level. Alternatively, when the heat pump inverter unit is at the target noise level, the compressor of the heat pump inverter unit is controlled to run at the maximum frequency of the compressor set corresponding to the target noise level for a second preset time at a first preset time interval, so as to ensure normal oil return of the compressor.

[0016] The second technical problem mentioned above is solved by the following technical solution: A control device for a heat pump inverter unit, wherein the heat pump inverter unit is pre-configured with multiple noise levels, each noise level is configured with a corresponding set ambient temperature range, and each noise level is configured with control parameters for controlling the heat pump inverter unit. The device includes: The instruction receiving module is used to receive the silence instruction from the heat pump inverter unit. The silence instruction carries the setting of the silence level. The ambient temperature acquisition module is used to acquire the current ambient temperature of the heat pump inverter unit. The first control module is used to control the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level if the current ambient temperature is within the set ambient temperature range corresponding to the set noise level. The second control module is used to determine the target noise level based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining noise level if the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, and control the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic flowchart of a first method for controlling a heat pump inverter unit according to an embodiment of the present invention; Figure 2 The diagram shows the relationship between capacity, load, and temperature of the heat pump inverter unit according to an embodiment of the present invention. Figure 3 This is a second flowchart illustrating the control method for a heat pump inverter unit according to an embodiment of the present invention; Figure 4 This is a flowchart illustrating a specific application example of the control method for a heat pump inverter unit according to an embodiment of the present invention; Figure 5 This is a structural block diagram of the control device for a heat pump inverter unit according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It is understood that before using the technical solutions disclosed in the various embodiments of the present invention, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in the present invention and their authorization should be obtained in accordance with relevant laws and regulations through appropriate means.

[0021] Heat pump heating units are commonly used heating equipment. The silent mode effectively improves the user experience. However, in related technologies, silent mode typically uses a single speed-limiting strategy to reduce the fan and compressor speeds, resulting in poor adaptability to various operating conditions. For example, in special conditions such as defrosting or oil return, the speed limit needs to be temporarily lifted, causing a rapid rebound in noise and severely impacting the user experience. Furthermore, excessive speed limiting requires sacrificing heating or cooling efficiency, leading to high energy losses, which also affect the user experience. Moreover, the control logic of a single speed-limiting strategy is too simple, lacking tiered speed limiting and dynamic adjustment mechanisms, making it difficult to balance the need for quiet operation with system performance.

[0022] This invention provides a control method and device for a heat pump inverter unit. While ensuring the heating capacity of the heat pump unit, it maximizes the control of the equipment to enter the silent mode, meets the user's demand for quiet operation, and significantly improves the user experience.

[0023] To better illustrate the solution, a brief introduction is given first to an optional application scenario of the control method for the heat pump inverter unit according to this invention. This control method can be applied to the controller of the heat pump inverter unit. The controller of the heat pump inverter unit communicates with a remote control or a user terminal configured with an APP (application program) for controlling the heat pump inverter unit, receiving a mute command from the user terminal or remote control. The controller also acquires temperature parameters such as the current ambient temperature through temperature acquisition devices such as temperature sensors. Furthermore, the controller can issue control commands to the compressor or fan. These control commands can be signals such as voltage and current, which, combined with the control circuit of the heat pump inverter unit, control the fan and compressor of the heat pump inverter unit to achieve silent control of the heat pump inverter unit.

[0024] According to an embodiment of the present invention, a control method embodiment for a heat pump variable frequency unit is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0025] This embodiment provides a control method for a heat pump inverter unit, which can be used in the controller of the aforementioned heat pump inverter unit. The heat pump inverter unit is pre-configured with multiple noise levels, each noise level is configured with a corresponding set ambient temperature range, and each noise level is configured with control parameters for controlling the heat pump inverter unit. Figure 1 This is a flowchart of a control method for a heat pump inverter unit according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps: Step S101: Receive the silent command from the heat pump inverter unit. The silent command carries the setting of the silent level.

[0026] In some alternative implementations, the mute command can be issued via a user terminal device such as a mobile phone or a remote control. For example, an app can be configured on the user terminal that can set up and issue control commands to the heat pump inverter unit. The heat pump inverter unit can be pre-bound through the app's interface, and when it is necessary to control the heat pump inverter unit, the user can select the heat pump inverter unit and issue appropriate control commands through the app's interface.

[0027] The mute command can be activated by clicking a button that indicates the mute level. For example, both the remote control and the app can be configured with buttons to represent different mute levels, such as Level 1 mute, Level 2 mute, and Level 3 mute.

[0028] Step S102: Obtain the current ambient temperature of the heat pump inverter unit.

[0029] In some alternative implementations, the current ambient temperature of the heat pump inverter unit can be directly obtained through the temperature acquisition equipment of the heat pump inverter unit.

[0030] Step S103: If the current ambient temperature is within the set ambient temperature range corresponding to the set noise level, then the set noise level is used as the target noise level, and the heat pump inverter unit is controlled to operate based on the target control parameters corresponding to the target noise level.

[0031] In some alternative implementations, the control parameters corresponding to the noise level are determined based on the noise range allowed by the noise level, and the set ambient temperature range corresponding to the noise level is determined based on the heating capacity that the heat pump inverter unit can achieve when operating with the control parameters corresponding to the noise level.

[0032] Specifically, each noise level can be pre-configured with a permissible noise range for that level. The higher the noise level, the smaller the upper limit of the permissible noise range, resulting in a higher level of noise reduction. The noise of a heat pump inverter unit is mainly generated by the compressor and fan. The higher the compressor frequency, the louder the noise; the higher the fan speed, the louder the noise.

[0033] In some optional implementations, the set ambient temperature ranges corresponding to multiple noise levels and the target control parameters corresponding to multiple noise levels can be pre-configured in the controller of the heat pump inverter unit in a mapped form. The target control parameters mainly include the compressor frequency range and fan speed range of the heat pump inverter unit.

[0034] Figure 2 A graph showing the relationship between capacity, load, and temperature of a heat pump inverter unit according to an embodiment of the present invention is provided. (Reference) Figure 2Taking a heat pump inverter unit used for heating as an example, through experimental data or theoretical calculations, the relationship curve Q1 between the demand load of the location using the heat pump inverter unit and the ambient temperature, and the relationship curve Q2 between the heating capacity achievable by the heat pump inverter unit operating with the control parameters corresponding to the noise level and the ambient temperature can be determined. Figure 2 It can be seen that at point A, the intersection of the two curves, the load demand of the location using the heat pump inverter stage is equal to the heating capacity achievable by the heat pump inverter unit operating with the control parameters corresponding to the noise level. Therefore, the ambient temperature at point A is the ambient temperature threshold corresponding to that noise level. When the current ambient temperature is greater than or equal to this threshold, the heating capacity achievable by the heat pump inverter unit operating with the control parameters corresponding to the noise level is greater than or equal to the load demand of the location using the heat pump inverter stage. Therefore, if the current ambient temperature is greater than or equal to this threshold, it is determined that the current ambient temperature is within the set ambient temperature range corresponding to the noise level.

[0035] Step S104: If the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, then the target noise level is determined based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining noise levels, and the heat pump inverter unit is controlled to operate based on the target control parameters corresponding to the target noise level.

[0036] In some optional implementations, multiple noise levels are set. When the current ambient temperature places a low demand on the heating capacity of the heat pump inverter unit, if the current ambient temperature is within the set ambient temperature range corresponding to the set noise level, the unit can directly enter silent mode with the set noise level as the target noise level. To maximize the success of the heat pump inverter unit entering silent mode, while prioritizing the user's set noise level, some noise reduction can be implemented. This allows for noise levels slightly exceeding the allowable noise range of the set noise level, prioritizing the heating capacity of the heat pump inverter unit. Specifically, if the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, it can be sequentially checked whether the current ambient temperature matches the set ambient temperature range corresponding to the remaining noise levels. The noise level whose set ambient temperature range matches the current ambient temperature is set as the target noise level, thereby controlling the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level. Therefore, while meeting the current ambient temperature requirements for the heating capacity of the heat pump inverter unit, it maximizes the chances of the heat pump inverter unit successfully entering silent mode, significantly improving the user experience.

[0037] The control method for a heat pump inverter unit of the present invention pre-configures multiple noise levels for the heat pump inverter unit, assigns a corresponding set ambient temperature range to each noise level, and configures control parameters for controlling the heat pump inverter unit for each noise level. Therefore, upon receiving a noise command from the heat pump inverter unit, the method first obtains the current ambient temperature of the heat pump inverter unit. Based on the current ambient temperature and the user's set noise level, it prioritizes determining whether the current ambient temperature falls within the set ambient temperature range corresponding to the set noise level. If it does, the unit enters the set noise level; otherwise, it determines a noise level as the target noise level based on the matching relationship between the current ambient temperature and the set ambient temperature ranges corresponding to the remaining noise levels, and controls the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level. This maximizes the control of the equipment into quiet mode while ensuring the heating capacity of the heat pump unit, meeting the user's demand for quiet operation and significantly improving the user experience.

[0038] This embodiment provides a control method for a heat pump inverter unit, which can be used in the controller of the aforementioned heat pump inverter unit. The heat pump inverter unit is pre-configured with multiple noise levels, each noise level is configured with a corresponding set ambient temperature range, and each noise level is configured with control parameters for controlling the heat pump inverter unit. Figure 3 This is a flowchart of a control method for a heat pump inverter unit according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps: Step S301: Receive the silent command from the heat pump inverter unit. The silent command carries the setting of the silent level.

[0039] Please refer to the above for details. Figure 2 Step S201 of the illustrated embodiment will not be described again here.

[0040] Step S302: Obtain the current ambient temperature of the heat pump inverter unit.

[0041] Please refer to the above for details. Figure 2 Step S202 of the illustrated embodiment will not be described again here.

[0042] Step S303: If the current ambient temperature is within the set ambient temperature range corresponding to the set noise level, then the set noise level is used as the target noise level.

[0043] Please refer to the above for details. Figure 3 Step S203 of the illustrated embodiment will not be described again here.

[0044] Step S304: If the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, then the target noise level is determined based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining noise levels.

[0045] In some alternative implementations, the higher the quietness level, the lower the upper limit of the noise range allowed by the quietness level, and the larger the minimum set environmental range for switching to the quietness level.

[0046] Therefore, it can be sequentially determined whether the current ambient temperature conforms to the set ambient temperature range corresponding to the quietness level one level lower than the set quietness level, until the quietness level corresponding to the set ambient temperature range that conforms to the current ambient temperature is determined as the target quietness level. This achieves the operation of "determining the target quietness level based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining quietness levels" in step S304.

[0047] For example, a heat pump inverter unit is configured with three noise levels: Level 1, Level 2, and Level 3. Level 1 noise level allows a noise range of 0-Z1 dB, Level 2 allows 0-Z2 dB, and Level 3 allows 0-Z3 dB, where Z3 < Z2 < Z1, meaning the upper limit of the allowable noise range decreases sequentially from Level 1 to Level 3. The environmental settings for switching the heat pump inverter unit to Level 1, Level 2, and Level 3 noise levels are T1-Tm, T2-Tm, and T3-Tm, respectively, where T1 < T2 < T3, meaning the minimum environmental setting for switching the heat pump inverter unit to Level 1, Level 2, and Level 3 noise levels increases sequentially.

[0048] If the noise level is set to Level 3, and the current temperature is not within the ambient temperature range corresponding to Level 3, the current ambient temperature can be matched sequentially with the ambient temperatures corresponding to Level 2 and Level 1, until the noise level corresponding to the set ambient temperature range that matches the current ambient temperature is determined as the target noise level.

[0049] In some alternative implementations, the target control parameters include the minimum set fan speed and the maximum set fan speed for the heat pump inverter unit at the target noise level, wherein the maximum set fan speed is greater than the minimum set fan speed.

[0050] Step S305: Control the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level.

[0051] Specifically, step S305 may include: Step S3051: Calculate the fan speed correction value based on the current ambient temperature, the maximum set fan speed, the pre-configured low temperature threshold of the heat pump inverter unit, and the minimum value of the set environment range for switching to the silent level.

[0052] In some alternative implementations, the following formula can be used to calculate the fan speed correction value based on the current ambient temperature, the maximum set fan speed, the pre-configured low temperature threshold of the heat pump inverter unit, and the minimum value of the set environmental range for switching to the silent level:

[0053] in, This indicates the fan speed correction value; This indicates the maximum set speed of the fan. Here, the maximum set speed of the fan refers to the maximum set speed of the fan in the target noise level of the heat pump inverter unit in the target control parameters. This maximum set speed of the fan is the highest speed that the fan can reach while ensuring that the fan operating noise is within an acceptable noise range, which effectively limits the upper limit of the fan speed when pursuing low noise operation. Indicates the current ambient temperature; This indicates the minimum range of ambient temperatures required to switch to the quietness level, which is also the lower limit of the ambient temperature corresponding to the target quietness level. The low temperature threshold of the heat pump inverter unit is pre-configured. It is based on the control strategy setting for triggering low temperature-related operations of the heat pump inverter unit. When the current ambient temperature is lower than the low temperature threshold, the heat pump inverter unit may trigger the preset low temperature control strategy. This control strategy has no substantial impact on the present invention, so it will not be explained in detail here.

[0054] Step S3052: Calculate the target fan speed of the heat pump inverter unit based on the fan speed correction value and the minimum fan speed limit of the heat pump inverter unit.

[0055] In some optional implementations, the target fan speed of the heat pump inverter unit is calculated based on the fan speed correction value and the heat pump inverter unit, including: The target fan speed of the heat pump inverter unit is calculated using the following formula:

[0056] in, This indicates the target rotational speed, which varies with the current ambient temperature. This indicates the minimum fan speed limit of the heat pump inverter unit. It is a preset fixed value. Here, the minimum fan speed limit is the lower limit of the fan speed, which is used to ensure that the fan can start normally and maintain basic operation, and to avoid the fan from stopping or failing to work properly due to the fan speed being too low. This indicates the maximum set wind speed for the fan; Indicates the current ambient temperature; This indicates the minimum value within the set environment range for switching to the silent level; This indicates the pre-configured low temperature threshold of the heat pump inverter unit, which is set based on the control strategy that triggers low temperature-related operations by the heat pump inverter unit. This indicates the fan speed correction value.

[0057] Step S3053: Control the fan of the heat pump inverter unit to operate based on the target fan speed, wherein the target fan speed is greater than the set minimum fan speed and less than the set maximum fan speed.

[0058] In some optional implementations, the target control parameters include the minimum and maximum compressor setting frequencies for the heat pump inverter unit at the target noise level, wherein the maximum compressor setting frequency is greater than the minimum compressor setting frequency. Step S203 or S204, "controlling the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level," further includes: Step S3054: Using a PID algorithm, the compressor of the heat pump inverter unit is frequency regulated with the compressor set minimum frequency, compressor set maximum frequency, and preset frequency compensation coefficient as algorithm target parameters.

[0059] Specifically, the compressor frequency of the heat pump inverter unit can be controlled using a PID algorithm. The compressor frequency adjustment range during the compressor control process is limited to the minimum and maximum frequency set by the compressor corresponding to the target noise level. Furthermore, the compressor frequency adjustment is combined with the compressor frequency compensation coefficient preset by the heat pump inverter unit to adjust the compressor frequency. In this way, the balance between compressor energy efficiency and the noise requirements of the target noise level can be effectively ensured.

[0060] In some optional implementations, after controlling the fan of the heat pump inverter unit to operate based on the target fan speed, step S203 or step S204, "controlling the heat pump inverter unit to operate based on target control parameters corresponding to the target noise level," further includes: Step S3055: When the target speed of the fan is greater than the maximum set wind speed of the fan, control the heat pump inverter unit to exit the silent mode.

[0061] If the target fan speed determined based on step a2 above is greater than the maximum set fan speed corresponding to the target noise level at the current moment, it means that if the heat pump inverter unit continues to operate at the target speed, the heating demand of the heat pump inverter unit will not be able to meet the current environment's demand for the heat pump inverter unit's heating capacity. Therefore, in order to ensure that the heat pump inverter unit outputs stable heat energy normally, the heat pump inverter unit is controlled to forcibly exit the silent mode.

[0062] Step S306: After controlling the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level, if the heat pump inverter unit is detected to be in defrost mode, then when the heat pump inverter unit switches to heating mode, control the heat pump inverter unit to operate at the maximum fan speed set according to the target noise level.

[0063] During defrosting in non-silent mode, the compressor operates at a fixed frequency, typically 60Hz. After defrosting, to quickly dry the moisture on the evaporator surface, the fan speed is adjusted to the maximum permissible speed, resulting in relatively high operating noise for the heat pump inverter unit. Therefore, to minimize noise while still meeting the requirement for rapid drying of the evaporator surface after defrosting, if the heat pump inverter unit is detected as being in defrosting mode, when switching to heating mode, the unit is controlled to operate at the maximum fan speed corresponding to the target noise level.

[0064] Step S307: When the heat pump inverter unit is at the target noise level, control the compressor of the heat pump inverter unit to run at the maximum frequency set by the compressor corresponding to the target noise level for a second preset time at a first preset time interval, so as to ensure the normal oil return of the compressor.

[0065] Specifically, in non-silent mode, the oil return process of a heat pump inverter unit refers to the compressor operating at low frequency for a period of time. The compressor's operating speed is low, and the lubricating oil needs to circulate by the mechanical power of the compressor's operation. The decrease in speed weakens the pumping capacity of the compressor's oil pump, reducing the amount of lubricating oil pumped to various lubrication points per unit time, which cannot meet normal lubrication requirements and will lead to oil loss over time. Therefore, to ensure normal and reliable lubrication of the compressor, after a period of low-frequency operation, the compressor needs to periodically operate at high frequency for a period of time. The low-frequency operation time and high-frequency operation time can be pre-configured and set according to compressor performance, lubricating oil quality, etc. The compressor oil return operation generally has a fixed frequency, mostly 60Hz.

[0066] Therefore, in silent mode, to ensure the equipment performance and lifespan of the heat pump inverter unit, the compressor of the heat pump inverter unit is also set to run at the compressor's set maximum frequency corresponding to the target silent level for a second preset time interval after a first preset time interval. In some alternative embodiments, to maximize the oil return effect and ensure the stable performance of the heat pump inverter unit, if the heat pump inverter unit is running in silent mode at any silent level, the compressor frequency is adjusted to the compressor's set maximum frequency corresponding to the lowest silent level of the unit, such as the compressor's set maximum frequency corresponding to the first-level silent level mentioned above, during the second preset time interval.

[0067] Figure 4It is a schematic flowchart of a specific application example of the control method for a heat pump variable-frequency unit according to an embodiment of the present invention; Step S401, during the operation of the equipment heat pump variable-frequency unit, a silent instruction is received.

[0068] Step S402, obtain the current ambient temperature at which the heat pump variable-frequency unit is operating, and based on the current ambient temperature, determine the target silent level, and set control parameters such as the maximum allowable operating speeds of the fan and compressor of the heat pump variable-frequency unit based on the target silent level.

[0069] Step S403, determine the current operating condition of the heat pump variable-frequency unit.

[0070] Specifically, it may include: Step S4031, determine whether the current operating condition is a normal condition. If so, execute Step S404; if not, execute Step S4A032.

[0071] Step S4032, determine whether the current operating condition is a defrosting condition. If so, after the heat pump variable-frequency unit completes defrosting, execute Step S404; if not, execute Step S4033.

[0072] S4033, enter the oil return condition according to the operating situation of the heat pump variable-frequency unit.

[0073] Here, reference can be made to Step S307 of the above Figure 3 illustrated embodiment.

[0074] Step S4A, collect the high-pressure acquisition value and low-pressure acquisition value at which the heat pump variable-frequency unit is operating, and determine the pressure ratio M of the heat pump variable-frequency unit.

[0075] Step S405, determine whether 2 < M < 4 holds. If so, execute Step S406; if not, execute Step S407.

[0076] It should be noted that the upper limit value 4 and lower limit value 2 of the pressure ratio in "2 < M < 4" here are preset pressure ratio thresholds, which can be set according to actual requirements in actual applications, and the present invention does not make specific limitations thereto.

[0077] Step S406, control the compressor to operate at the maximum frequency limit set for the compressor at the first-level silent mode. [[ID=3A]]

[0078] Specifically, during the operation of controlling the compressor, Step S408 is simultaneously executed to control the fan speed of the heat pump variable-frequency unit.

[0079] Step S407, control the heat pump variable-frequency unit to operate at the speed limit frequency corresponding to the silent level.

[0080] Step S408: The PID algorithm is used to control the fan speed of the heat pump inverter unit.

[0081] Step S409: Control the compressor to run at the maximum frequency and speed limit set for the first-level silent compressor, and control the fan to run at the maximum wind speed set for the first-level silent fan.

[0082] It should be noted that step S409 is an operation step performed when the defrosting mode of the heat pump inverter unit is detected to have ended. The duration of step S409 each time the defrosting mode is exited is a set duration, which can be pre-configured as needed.

[0083] Step S410: Control the compressor to run at the maximum frequency limit of the first-level quiet compressor setting, and use the PID algorithm to control the control fan of the heat pump inverter unit to run at the maximum fan speed and minimum fan speed limit corresponding to the target quiet level.

[0084] It should be noted that step S410 is an operation step performed at first preset time intervals when the heat pump inverter unit is in silent mode. The duration of each execution of step S410 is the second preset time. The first preset time and the second preset time can be pre-configured as needed.

[0085] Figure 4 For detailed information in the illustrated embodiments, please refer to the above. Figures 1-3 The description of the illustrated embodiment will not be repeated here.

[0086] This embodiment also provides a control device for a heat pump inverter unit. The heat pump inverter unit is pre-configured with multiple noise levels, each with a corresponding set ambient temperature range, and each noise level is configured with control parameters for controlling the heat pump inverter unit. This device is used to implement the above embodiments and preferred embodiments, and details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0087] This embodiment provides a control device for a heat pump inverter unit, such as... Figure 5 As shown, the device includes: The instruction receiving module 501 is used to receive the silence instruction of the heat pump inverter unit. The silence instruction carries the setting of the silence level. Ambient temperature acquisition module 502 is used to acquire the current ambient temperature of the heat pump inverter unit; The first control module 503 is used to control the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level if the current ambient temperature is within the set ambient temperature range corresponding to the set noise level. The second control module 504 is used to determine the target noise level based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining noise level if the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, and control the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level.

[0088] In some alternative implementations, the higher the quietness level, the lower the upper limit of the noise range allowed by the quietness level, and the larger the minimum set environment range for switching to the quietness level. The second control module 504 includes: The level adjustment unit is used to sequentially determine whether the current ambient temperature conforms to the set ambient temperature range corresponding to a quietness level one level lower than the set quietness level, until the quietness level corresponding to the set ambient temperature range that conforms to the current ambient temperature is determined as the target quietness level.

[0089] In some alternative implementations, the control parameters corresponding to the quietness level are determined based on the noise range allowed by the quietness level; The set ambient temperature range corresponding to the noise level is determined based on the heating capacity that the heat pump inverter unit can achieve when operating with the control parameters corresponding to the noise level.

[0090] In some optional implementations, the target control parameters include the minimum set fan speed and the maximum set fan speed for the heat pump inverter unit at the target noise level, wherein the maximum set fan speed is greater than the minimum set fan speed. The first control module 503 or the second control module 504 includes: The first calculation unit is used to calculate the fan speed correction value based on the current ambient temperature, the maximum set fan speed, the pre-configured low temperature threshold of the heat pump inverter unit, and the minimum value of the set environment range for switching to the silent level. The second calculation unit is used to calculate the target fan speed of the heat pump inverter unit based on the fan speed correction value and the minimum fan speed limit of the heat pump inverter unit. The fan control unit is used to control the fan of the heat pump inverter unit to operate based on the target fan speed. Among them, the target speed of the fan is greater than the minimum set wind speed of the fan and less than the maximum set wind speed of the fan.

[0091] In some optional implementations, the first calculation unit uses the following formula to obtain the fan speed correction value;

[0092] This indicates the fan speed correction value; This indicates the maximum set wind speed for the fan; Indicates the current ambient temperature; This indicates the minimum value within the set environment range for switching to the silent level; This indicates the pre-configured low-temperature threshold of the heat pump inverter unit, which is set based on the control strategy that triggers low-temperature related operations by the heat pump inverter unit.

[0093] In some optional implementations, the second calculation unit calculates the target fan speed of the heat pump inverter unit using the following formula:

[0094] in, Indicates the target rotational speed; This indicates the minimum fan speed limit of the heat pump inverter unit, which is a preset fixed value; This indicates the maximum set wind speed for the fan; Indicates the current ambient temperature; This indicates the minimum value within the set environment range for switching to the silent level; This indicates the pre-configured low temperature threshold of the heat pump inverter unit, which is set based on the control strategy that triggers low temperature-related operations by the heat pump inverter unit. This indicates the fan speed correction value.

[0095] In some optional implementations, the first control module 503 or the second control module 504 further includes: The exit unit is used to control the heat pump inverter unit to exit the silent mode after the fan of the control heat pump inverter unit is running based on the target fan speed, when the target fan speed is greater than the set maximum fan speed.

[0096] In some optional implementations, the target control parameters include the minimum and maximum compressor setting frequencies for the heat pump inverter unit at the target noise level, wherein the maximum compressor setting frequency is greater than the minimum compressor setting frequency. The first control module 503 or the second control module 504 further includes: The frequency regulation module is used to regulate the frequency of the compressor of the heat pump inverter unit using a PID algorithm with the compressor's set minimum frequency, compressor's set maximum frequency, and a pre-set frequency compensation coefficient as the algorithm's target parameters.

[0097] In some alternative embodiments, the apparatus further includes: The defrost mode control module is used to detect that the heat pump inverter unit is in defrost mode after the heat pump inverter unit is operating based on the target control parameters corresponding to the target noise level. When the heat pump inverter unit switches to heating mode, it controls the heat pump inverter unit to operate at the maximum fan speed set corresponding to the target noise level. Alternatively, the oil return mode module is used to control the compressor of the heat pump inverter unit to run at the maximum frequency set corresponding to the target noise level for a second preset time at a first preset time interval, so as to ensure normal oil return of the compressor when the heat pump inverter unit is at the target noise level.

[0098] The control device for the heat pump inverter unit provided in this embodiment of the invention can execute the control method for the heat pump inverter unit provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects for executing the method. Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0099] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention.

[0100] The following is a detailed reference. Figure 6 The diagram illustrates a structural schematic suitable for implementing an electronic device according to embodiments of the present invention. The electronic device may include a processor (e.g., a central processing unit, graphics processor, etc.) 501, which can perform various appropriate actions and processes according to a program stored in read-only memory (ROM) 502 or a program loaded from memory 508 into random access memory (RAM) 503. The RAM 503 also stores various programs and data required for the operation of the electronic device. The processor 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0101] Typically, the following devices can be connected to I / O interface 505: input devices 506 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 507 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 508 including, for example, magnetic tapes, hard disks, etc.; and communication devices 509. Communication device 509 allows electronic devices to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 5Electronic devices with various devices are shown, but it should be understood that it is not required to implement or have all of the devices shown, and more or fewer devices may be implemented or have instead.

[0102] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 509, or installed from a memory 508, or installed from a ROM 502. When the computer program is executed by the processor 501, it performs the functions defined in the control method of the heat pump inverter unit of the embodiments of the present invention.

[0103] Figure 5 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0104] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the control method of the heat pump inverter unit shown in the above embodiments is implemented.

[0105] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0106] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended technical solutions.

Claims

1. A control method for a heat pump variable frequency unit, characterized in that, The heat pump inverter unit is pre-configured with multiple noise levels, each with a corresponding set ambient temperature range, and each noise level is configured with control parameters for controlling the heat pump inverter. The method includes: Receive a noise reduction command from the heat pump inverter unit, the noise reduction command carrying the setting of the noise reduction level; Obtain the current ambient temperature of the heat pump inverter unit; If the current ambient temperature is within the set ambient temperature range corresponding to the set noise level, then the set noise level is used as the target noise level, and the heat pump inverter unit is controlled to operate based on the target control parameters corresponding to the target noise level; If the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, then the target noise level is determined based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining noise levels, and the heat pump inverter unit is controlled to operate based on the target control parameters corresponding to the target noise level.

2. The method according to claim 1, characterized in that, The higher the noise level, the lower the upper limit of the noise range allowed by the noise level, and the larger the minimum value of the set environment range to switch to the noise level. The determination of the target noise level based on the matching relationship between the current ambient temperature and the set ambient temperature range corresponding to the remaining noise levels includes: The system sequentially determines whether the current ambient temperature conforms to the set environmental range corresponding to a quietness level one level lower than the set quietness level, until the quietness level corresponding to the set ambient temperature range that conforms to the current ambient temperature is determined as the target quietness level.

3. The method according to claim 2, characterized in that, The control parameters corresponding to the quietness level are determined based on the noise range allowed by the quietness level; The set ambient temperature range corresponding to the noise level is determined based on the heating capacity that the heat pump inverter unit can achieve when operating with the control parameters corresponding to the noise level.

4. The method according to claim 1, characterized in that, The target control parameters include the minimum set wind speed and the maximum set wind speed of the fan for the heat pump inverter unit at the target noise level, wherein the maximum set wind speed is greater than the minimum set wind speed. The control of the heat pump inverter unit based on target control parameters corresponding to the target noise level includes: Based on the current ambient temperature, the maximum set wind speed of the fan, the pre-configured low temperature threshold of the heat pump inverter unit, and the minimum value of the set environmental range for switching to the noise level, calculate the fan speed correction value. Based on the fan speed correction value and the minimum fan speed limit of the heat pump inverter unit, calculate the target fan speed of the heat pump inverter unit; The fan of the heat pump inverter unit is controlled to operate based on the target fan speed. The target rotational speed of the fan is greater than the minimum set wind speed of the fan and less than the maximum set wind speed of the fan.

5. The method according to claim 4, characterized in that, The calculation of the fan speed correction value based on the current ambient temperature, the maximum set fan speed, the pre-configured low temperature threshold of the heat pump inverter unit, and the minimum value of the set environmental range for switching to the noise level includes: The fan speed correction value is obtained using the following formula; This indicates the fan speed correction value; This indicates that the fan is set to its maximum wind speed; This indicates the current ambient temperature; This indicates the minimum value of the set environmental range to which the noise level is switched; This indicates the pre-configured low temperature threshold of the heat pump inverter unit, which is set based on the control strategy that triggers low temperature-related operations by the heat pump inverter unit.

6. The method according to claim 4, characterized in that, The step of calculating the target fan speed of the heat pump inverter unit based on the fan speed correction value and the heat pump inverter unit includes: The target fan speed of the heat pump inverter unit is calculated using the following formula: in, Indicates the target rotational speed; This indicates that the minimum fan speed limit of the heat pump inverter unit is a preset fixed value; This indicates that the fan is set to its maximum wind speed; This indicates the current ambient temperature; This indicates the minimum value of the set environmental range to which the noise level is switched; This indicates the pre-configured low temperature threshold of the heat pump inverter unit, which is set based on the control strategy that triggers low temperature-related operations by the heat pump inverter unit. This indicates the fan speed correction value.

7. The method according to claim 4, characterized in that, After controlling the fan of the heat pump inverter unit to operate based on the target fan speed, the method of controlling the heat pump inverter unit to operate based on target control parameters corresponding to the target noise level further includes: When the target speed of the fan is greater than the set maximum wind speed of the fan, the heat pump inverter unit is controlled to exit the silent mode.

8. The method according to claim 4, characterized in that, The target control parameters include the minimum and maximum compressor settings for the heat pump inverter unit at the target noise level, wherein the maximum compressor setting frequency is greater than the minimum compressor setting frequency. The control of the heat pump inverter unit based on target control parameters corresponding to the target noise level also includes: The PID algorithm is used to regulate the frequency of the compressor of the heat pump inverter unit, with the minimum set frequency of the compressor, the maximum set frequency of the compressor, and the preset frequency compensation coefficient as the algorithm target parameters.

9. The method according to claim 1, characterized in that, After controlling the heat pump inverter unit to operate based on target control parameters corresponding to the target noise level, the method further includes: If the heat pump inverter unit is detected to be in defrosting mode, then when the heat pump inverter unit switches to heating mode, the heat pump inverter unit is controlled to run at the maximum fan speed set corresponding to the target noise level. Alternatively, when the heat pump inverter unit is at the target noise level, the compressor of the heat pump inverter unit is controlled to run at the maximum compressor setting frequency corresponding to the target noise level for a second preset time at a first preset time interval, so as to ensure the normal oil return of the compressor.

10. A control device for a heat pump variable frequency unit, characterized in that, The heat pump inverter unit is pre-configured with multiple noise levels, each with a corresponding set ambient temperature range, and each noise level is configured with control parameters for controlling the heat pump inverter. The device includes: The instruction receiving module is used to receive the mute instruction of the heat pump inverter unit, the mute instruction carrying the setting of the mute level; The ambient temperature acquisition module is used to acquire the current ambient temperature of the heat pump inverter unit; The first control module is used to control the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level if the current ambient temperature is within the set ambient temperature range corresponding to the set noise level. The second control module is used to determine a target noise level based on the matching relationship between the current ambient temperature and the remaining set ambient temperature ranges corresponding to the noise level if the current ambient temperature is not within the set ambient temperature range corresponding to the set noise level, and to control the heat pump inverter unit to operate based on the target control parameters corresponding to the target noise level.

Images