A control method and device of a battery thermal management system and a storage medium

Abstract

The application discloses a control method, equipment and storage medium of a battery thermal management system, and the control method comprises the following contents: A: adjusting the initial frequency of a compressor according to the ambient temperature; B: starting the compressor, and after the compressor is operated at the initial frequency for an initial operation time t, adjusting the working frequency of the compressor according to the water outlet temperature difference w The application can more stably control the water temperature, reduce over-regulation and shutdown conditions, reduce the power consumption of the thermal management system, adjust the power consumption of the electrical equipment in real time according to the water temperature change, stabilize the water temperature at the target water temperature, reduce the power consumption, and ensure that the battery works in the best temperature range.

Description

Technical Field

[0001] This invention specifically relates to a control method, device, and storage medium for a battery thermal management system. Background Technology

[0002] The main control objective of existing independent battery thermal management is the inlet and outlet water temperature of the battery itself. The cooling capacity of the thermal management system and the heat generation of the battery should be balanced as much as possible. At this point, the battery temperature rise can be slowed down, thus ensuring the battery is in optimal condition.

[0003] Most thermal management units on the market currently control the water temperature within ±5°C of the battery's target water temperature. When their control logic is flawed, the following situations may occur:

[0004] 1. The cooling capacity of the thermal management unit is much greater than the heat generated by the battery. At this time, the water temperature will drop rapidly, and the unit will then shut down. When the water pump circulates, the water temperature will also rise rapidly, causing frequent start-stop, reducing the number of times the high-voltage relay is used and its lifespan.

[0005] 2. During the water pump circulation process, when the unit is first turned on, the cooling capacity of the thermal management unit is much less than the heat generated by the battery. The water temperature will exceed the battery's set target water temperature by ±5°C. At this time, the BMS battery management system will consider this a fault. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention proposes a control method, device, and storage medium for a battery thermal management system.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] On one hand, this invention discloses a control method for a battery thermal management system, comprising the following:

[0009] A: Adjust the compressor's initial frequency according to the ambient temperature;

[0010] B: The compressor starts and runs at the initial frequency. After the initial running time t, the temperature difference ΔT between the outlet water and the compressor is calculated. w Adjust the compressor's operating frequency.

[0011] Based on the above technical solution, the following improvements can be made:

[0012] As a preferred option, A specifically includes the following:

[0013] The ambient temperature is T 环境 At that time, the initial frequency of the compressor is set to H0;

[0014] If the ambient temperature drops by 1°C, the compressor's initial frequency decreases by ΔH1 until it reaches the compressor's initial minimum frequency H. 0下限 ;

[0015] If the initial frequency of the compressor increases by ΔH2 for every 1°C increase in ambient temperature, it will continue to increase until the compressor reaches its maximum frequency H. 0上限 .

[0016] As the preferred option, B specifically includes the following:

[0017] When △T w When the compressor operates within the threshold range formed by the upper and lower limits, it maintains its original initial operating frequency.

[0018] When △T w When not within the threshold range,

[0019] If △T w If the upper limit is exceeded, the compressor operating frequency will be increased, and ΔT w The larger the value, the greater the increase in compressor operating frequency. When the compressor operating frequency rises to H... 上限 When this happens, the compressor's operating frequency will no longer increase;

[0020] If △T w If the value is below the lower limit, the compressor operating frequency will be reduced, and |△T w The larger the value, the more the compressor operating frequency decreases. When the compressor operating frequency drops to H... 下限 At that time, and △T w If the value is below the threshold, the compressor will stop.

[0021] As a preferred embodiment, B also includes fine-tuning of the compressor's operating frequency, specifically including the following:

[0022] After the compressor operating frequency is adjusted, the calculation period t is maintained. 周期 Then perform the following judgment:

[0023] If the outlet water temperature is within a certain range and maintained for at least 2 hours 周期 When the water temperature is above the target water temperature, the compressor operating frequency increases by H. 补偿 ;

[0024] If the outlet water temperature is within a certain range and maintained for at least 2 hours 周期 When the water temperature is below the target water temperature, the compressor operating frequency decreases by H. 补偿 .

[0025] On the other hand, the present invention also discloses a control device for a battery thermal management system, comprising:

[0026] An initial frequency adjustment device is used to adjust the initial frequency of the compressor according to the ambient temperature.

[0027] The operating frequency regulating device is used to adjust the operating frequency based on the outlet water temperature difference ΔT after the compressor starts and operates at the initial frequency for the initial running time t. w Adjust the compressor's operating frequency.

[0028] As a preferred embodiment, the initial frequency regulating device regulates the initial frequency of the compressor by means of the following:

[0029] The ambient temperature is T 环境 At that time, the initial frequency of the compressor is set to H0;

[0030] If the ambient temperature drops by 1°C, the compressor's initial frequency decreases by ΔH1 until it reaches the compressor's initial minimum frequency H. 0下限 ;

[0031] If the initial frequency of the compressor increases by ΔH2 for every 1°C increase in ambient temperature, it will continue to increase until the compressor reaches its maximum frequency H. 0上限 .

[0032] As a preferred embodiment, the operating frequency regulation device specifically regulates the compressor's operating frequency as follows:

[0033] When △T w When the compressor operates within the threshold range formed by the upper and lower limits, it maintains its original initial operating frequency.

[0034] When △T w When not within the threshold range,

[0035] If △T w If the upper limit is exceeded, the compressor operating frequency will be increased, and ΔT w The larger the value, the greater the increase in compressor operating frequency. When the compressor operating frequency rises to H... 上限 When this happens, the compressor's operating frequency will no longer increase;

[0036] If △T w If the value is below the lower limit, the compressor operating frequency will be reduced, and |△T w The larger the value, the more the compressor operating frequency decreases. When the compressor operating frequency drops to H... 下限 At that time, and △T w If the value is below the threshold, the compressor will stop.

[0037] As a preferred embodiment, the operating frequency regulating device can also fine-tune the compressor operating frequency through the following:

[0038] After the compressor operating frequency is adjusted, the calculation period t is maintained.周期 Then perform the following judgment:

[0039] If the outlet water temperature is within a certain range and maintained for at least 2 hours 周期 When the water temperature is above the target water temperature, the compressor operating frequency increases by H. 补偿 ;

[0040] If the outlet water temperature is within a certain range and maintained for at least 2 hours 周期 When the water temperature is below the target water temperature, the compressor operating frequency decreases by H. 补偿 .

[0041] In addition, the present invention also discloses a storage medium storing one or more programs, which can be loaded by a memory and executed by any of the above-described control methods.

[0042] The control method, device, and storage medium of the battery thermal management system of the present invention have the following beneficial effects:

[0043] First, it can control the water temperature more stably and reduce over-adjustment and shutdown.

[0044] Second, reduce the power consumption of the thermal management system. Adjust the power consumption of its electrical equipment in real time according to changes in water temperature to stabilize the water temperature at the target temperature and reduce power consumption. Attached Figure Description

[0045] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 A flowchart of a control method provided in an embodiment of the present invention.

[0047] Figure 2 A block diagram of a control device provided in an embodiment of the present invention.

[0048] Wherein: 1-Initial frequency adjustment device, 2-Operating frequency adjustment device. Detailed Implementation

[0049] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0050] 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, and 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.

[0051] Using ordinal numbers such as “first,” “second,” “third,” etc. to describe ordinary objects merely indicates different instances of similar objects and is not intended to imply that the objects being described must have a given order in time, space, sequence, or any other way.

[0052] Furthermore, the expression "includes" is an "open-ended" expression, which means only that there is a corresponding component or step, and should not be interpreted as excluding additional components or steps.

[0053] To achieve the objectives of this invention, some embodiments of a control method, device, and storage medium for a battery thermal management system, such as... Figure 1 As shown, the control method includes the following:

[0054] A: Adjust the compressor's initial frequency according to the ambient temperature;

[0055] B: The compressor starts and runs at the initial frequency. After the initial running time t, the temperature difference ΔT between the outlet water and the compressor is calculated. w Adjust the compressor's operating frequency.

[0056] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining technical features are the same, except that A specifically includes the following:

[0057] The ambient temperature is T 环境 At that time, the initial frequency of the compressor is set to H0;

[0058] If the ambient temperature drops by 1°C, the compressor's initial frequency decreases by ΔH1 until it reaches the compressor's initial minimum frequency H. 0下限 ;

[0059] If the initial frequency of the compressor increases by ΔH2 for every 1°C increase in ambient temperature, it will continue to increase until the compressor reaches its maximum frequency H. 0上限 .

[0060] In some specific embodiments, when the ambient temperature is 35°C, the initial frequency of the compressor is set to 150 Hz;

[0061] If the ambient temperature drops by 1°C, the compressor's initial frequency decreases by 5Hz until it reaches the compressor's initial minimum frequency of 75Hz.

[0062] If the ambient temperature rises by 1°C, the initial frequency of the compressor increases by 5Hz, until it reaches the compressor's maximum frequency of 175Hz.

[0063] When the compressor speed drops to H 下限 (e.g., 45Hz) then descent is not allowed.

[0064] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining technical features are the same, except that B specifically includes the following:

[0065] When △T w When the compressor operates within the threshold range formed by the upper and lower limits, it maintains its original initial operating frequency.

[0066] When △T w When not within the threshold range,

[0067] If △T w If the upper limit is exceeded, the compressor operating frequency will be increased, and ΔT w The larger the value, the greater the increase in compressor operating frequency. When the compressor operating frequency rises to H... 上限 When this happens, the compressor's operating frequency will no longer increase;

[0068] If △T w If the value is below the lower limit, the compressor operating frequency will be reduced, and |△T w The larger the value, the more the compressor operating frequency decreases. When the compressor operating frequency drops to H... 下限 At that time, and △T w If the value is below the threshold, the compressor will stop.

[0069] The specific method is as follows:

[0070] When T1℃≥△T w At ≥-T4℃, the compressor operates at its original initial frequency.

[0071] When △T w At temperatures above T3℃, the compressor operating frequency increases by ΔH3.

[0072] When T3℃>△T w At ≥T2℃, the compressor operating frequency increases by ΔH4;

[0073] When T2℃>△T w At temperatures ≥T1℃, the compressor operating frequency increases by ΔH5;

[0074] When the compressor operating frequency rises to H 上限 When this happens, the compressor's operating frequency will no longer increase;

[0075] Where: T3>T2>T1, and △H3>△H4>△H5;

[0076] When △T w When the temperature is below -T6℃, the compressor operating frequency decreases by ΔH6.

[0077] When -T6℃ < △T w At ≤-T5℃, the compressor operating frequency decreases by △H7;

[0078] When -T5℃ < △T w At temperatures below -4℃, the compressor operating frequency decreases by ΔH8.

[0079] When the compressor operating frequency drops to H 下限 At that time, and △T w If the value is less than the threshold, the compressor will stop.

[0080] Where: -T6 < -T5 < -T4, and △H6 > △H7 > △H8.

[0081] In some specific embodiments, the compressor starts and runs at the initial frequency for an initial operating time of 180 seconds. Then, based on the outlet water temperature difference ΔT... w Adjust the compressor's operating frequency.

[0082] H 上限 250Hz, H 下限 It is 45Hz.

[0083] When 1℃≥△T w At temperatures ≥-1℃, the compressor maintains its original operating frequency.

[0084] When △T w At temperatures above 5℃, the compressor operating frequency increases by 28Hz.

[0085] When 5℃>△T w At ≥3℃, the compressor operating frequency increases by 20Hz;

[0086] When 3℃>△T w At ≥1℃, the compressor operating frequency increases by 10Hz;

[0087] The compressor frequency increased to H 上限 When this happens, the compressor's operating frequency will no longer increase;

[0088] When △T w At temperatures below -5℃, the compressor operating frequency decreases by 28Hz.

[0089] When -5℃ < ΔT w At ≤-3℃, the compressor operating frequency decreases by 20Hz;

[0090] When -3℃ < ΔTw When the temperature is below -1℃, the compressor operating frequency decreases by 10Hz.

[0091] The compressor operating frequency drops to H 下限 At that time, and △T w If the temperature is below -4℃, the compressor will stop.

[0092] Furthermore, B also includes fine-tuning of the compressor's operating frequency, specifically including the following:

[0093] After the compressor operating frequency is adjusted, the calculation period t is maintained. 周期 Then perform the following judgment:

[0094] If the outlet water temperature is within a certain range and maintained for at least 2 hours 周期 When the water temperature is above the target water temperature, the compressor operating frequency increases by H. 补偿 ;

[0095] If the outlet water temperature is within a certain range and maintained for at least 2 hours 周期 When the water temperature is below the target water temperature, the compressor operating frequency decreases by H. 补偿 .

[0096] In some specific embodiments,

[0097] When the outlet water temperature is 1℃≥△T w Maintain for 2 t within the range of ≥-1℃ 周期 If the water temperature is above the target water temperature, the compressor operating frequency will increase by H. 补偿 ;

[0098] When the outlet water temperature is 1℃≥△T w Maintain for 2 t within the range of ≥-1℃ 周期 If the water temperature is below the target water temperature, the compressor operating frequency will decrease. 补偿 .

[0099] Furthermore, when the compressor is in H 下限 During startup, the water temperature detection cycle is t. 周期 / 2, this state is maintained for 1 t 周期 It then returned to normal control.

[0100] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining technical features are the same, except that the control method further includes the following:

[0101] C: Control the pressure of the unit using refrigerant R within a certain pressure range.

[0102] The refrigerant R can be, but is not limited to, refrigerant R410C. Different refrigerants require different pressure control ranges for the unit. For example, the unit pressure control range for R410C refrigerant is 3.0 MPa-3.2 MPa.

[0103] The target pressure value should be controlled within the range of 3.0 MPa to 3.2 MPa.

[0104] When the pressure value is between 3.2 MPa and 3.6 MPa, the compressor should be operated at either increased or decreased speed.

[0105] When the pressure value is between 3.6Mpa and 3.8Mpa, the compressor speed is reduced. At this time, the priority of reducing the compressor speed is higher than the logic of adjusting the speed according to the outlet water temperature, that is, when the water temperature is high, the compressor needs to increase the speed.

[0106] When the pressure value is greater than 3.8 MPa, an alarm should be triggered and the machine should be shut down.

[0107] Specifically: the maximum speed of the fan has a duty cycle of 85%, and the minimum speed has a duty cycle of 20%.

[0108] When the fan starts, without considering the ambient temperature, the PWM signal duty cycle is 70% for 0.5 minutes.

[0109] Due to different initial pressure values, after running for 0.5 minutes at a fan speed duty cycle of 70%, the high temperature may exceed 3.2 MPa. At this point, the duty cycle needs to be increased by 5% (adjustable) every 29 seconds. When the pressure is controlled between 3.0 MPa and 3.2 MPa, maintain the current duty cycle A. If the maximum duty cycle of 85% is reached, and the pressure is higher than 3.2 MPa but lower than 3.6 MPa, the compressor will increase or decrease its speed according to the inlet and outlet water temperature logic. If 3.8 MPa > pressure value > 3.6 MPa, the compressor needs to decrease its speed. In this case, the priority of decreasing the compressor speed is higher than the logic of adjusting the speed according to the outlet water temperature (i.e., when the water temperature is high and the compressor needs to increase its speed). The compressor needs to decrease its speed by 50 Hz every 1 minute until it reaches the minimum speed of 45 Hz. If the pressure value is still higher than 3.8 MPa at this time, a pressure fault alarm will be triggered.

[0110] The low temperature may be below 0.8 MPa. To ensure normal oil return from the compressor, control the pressure between 3.0 MPa and 3.2 MPa. At this point, reduce the duty cycle by 10% (adjustable) every 29 seconds. When the pressure is controlled between 3.0 MPa and 3.2 MPa, maintain this duty cycle (B). If the pressure remains below the normal range even at the lowest speed, maintain the fan speed and duty cycle at 20%.

[0111] The fan shuts down when the vehicle sends a command to shut down the fan (other than the cooling command) or when the compressor meets the shutdown conditions.

[0112] On the other hand, the present invention also discloses a control device for a battery thermal management system, such as... Figure 2 As shown, it includes:

[0113] Initial frequency adjustment device 1, which is used to adjust the initial frequency of the compressor according to the ambient temperature;

[0114] Operating frequency adjustment device 2 is used to adjust the operating frequency based on the outlet water temperature difference ΔT after the compressor starts and operates at the initial frequency for the initial running time t. w Adjust the compressor's operating frequency.

[0115] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining features are the same, except that the initial frequency adjustment device 1 adjusts the initial frequency of the compressor by the following:

[0116] The ambient temperature is T 环境 At that time, the initial frequency of the compressor is set to H0;

[0117] If the ambient temperature drops by 1°C, the compressor's initial frequency decreases by ΔH1 until it reaches the compressor's initial minimum frequency H. 0下限 ;

[0118] If the initial frequency of the compressor increases by ΔH2 for every 1°C increase in ambient temperature, it will continue to increase until the compressor reaches its maximum frequency H. 0上限 .

[0119] For details on the operation of the initial frequency adjustment device, please refer to step A above.

[0120] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining technical features are the same, except that the operating frequency adjustment device 2 specifically adjusts the operating frequency of the compressor as follows:

[0121] When △T w When the compressor operates within the threshold range formed by the upper and lower limits, it maintains its original initial operating frequency.

[0122] When △T w When not within the threshold range,

[0123] If △T w If the upper limit is exceeded, the compressor operating frequency will be increased, and ΔT w The larger the value, the greater the increase in compressor operating frequency. When the compressor operating frequency rises to H... 上限When this happens, the compressor's operating frequency will no longer increase;

[0124] If △T w If the value is below the lower limit, the compressor operating frequency will be reduced, and |△T w The larger the value, the more the compressor operating frequency decreases. When the compressor operating frequency drops to H... 下限 At that time, and △T w If the value is below the threshold, the compressor will stop.

[0125] Furthermore, the operating frequency adjustment device 2 can also fine-tune the compressor operating frequency through the following:

[0126] After the compressor operating frequency is adjusted, the calculation period t is maintained. 周期 Then perform the following judgment:

[0127] If the outlet water temperature is within a certain range and maintained for at least 2 hours 周期 When the water temperature is above the target water temperature, the compressor operating frequency increases by H. 补偿 ;

[0128] If the outlet water temperature is within a certain range and maintained for at least 2 hours 周期 When the water temperature is below the target water temperature, the compressor operating frequency decreases by H. 补偿 .

[0129] For details on the operation of the frequency adjustment device, please refer to step B above.

[0130] To further optimize the implementation effect of the present invention, in some other embodiments, the remaining technical features are the same, except that the control device further includes:

[0131] A pressure regulating device is used to control the pressure of the unit using refrigerant R within a certain pressure range. Specific adjustment methods can be found in the description of the control methods above.

[0132] Furthermore, embodiments of the present invention also disclose a storage medium storing one or more programs, which can be loaded by a memory and execute the control method disclosed in any of the above embodiments.

[0133] The above-mentioned implementation methods can be carried out in parallel or in a cross-cutting manner.

[0134] The control method, device, and storage medium of the battery thermal management system of the present invention have the following beneficial effects:

[0135] First, it can control the water temperature more stably and reduce over-adjustment and shutdown.

[0136] Second, reduce the power consumption of the thermal management system. Adjust the power consumption of its electrical equipment in real time according to changes in water temperature to stabilize the water temperature at the target temperature and reduce power consumption.

[0137] This invention can effectively and stably control the cooling capacity of the thermal management system, ensuring that the water temperature is within ±1℃ of the target water temperature, while reducing power consumption and ensuring that the battery operates within the optimal temperature range.

[0138] It is worth noting that this invention can be applied to vehicle battery thermal management systems and can also be applied to other fields.

[0139] It should be understood that the various techniques described herein can be implemented in combination with hardware or software, or a combination thereof. Thus, the methods and apparatus of the present invention, or certain aspects or portions thereof, can take the form of program code (i.e., instructions) embedded in a tangible medium, such as a floppy disk, CD-ROM, hard disk, or any other machine-readable storage medium, wherein when the program is loaded into and executed by a machine such as a computer, that machine becomes an apparatus for practicing the present invention.

[0140] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0141] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0142] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

[0143] The control method of this invention is to control the device by manually starting and stopping the switch. The wiring diagram of the power element and the supply of power are common knowledge in the field. Since this invention is mainly used to protect mechanical devices, the control method and wiring layout will not be explained in detail.

Claims

1. A control method of a battery thermal management system, characterized by, Comprise the following: A: adjusting an initial frequency of the compressor according to an ambient temperature; B: the compressor is started and runs at the initial frequency for an initial operation time t, and then the working frequency of the compressor is adjusted according to the water outlet temperature difference AT w adjusting the working frequency of the compressor; B specifically comprises the following: When △T w When the threshold range formed by the upper limit value and the lower limit value, the operating frequency of the compressor is maintained at the original initial frequency. when ΔT w not in the threshold range, If ΔT w exceeds the upper limit, the compressor operating frequency is increased, and ΔT w is larger, the compressor operating frequency is increased more, and when the compressor operating frequency rises to H 上限 , the compressor operating frequency is no longer increased. If ΔT w is below the lower limit, the compressor operating frequency is reduced, and the greater |ΔT w | is, the more the compressor operating frequency is reduced, when the compressor operating frequency is reduced to H 下限 , and ΔT w is less than a threshold value, the compressor is stopped. B further comprises fine adjustment of the operating frequency of the compressor, specifically comprising the following: When the compressor operating frequency is adjusted, the calculation period t is maintained 周期 The following determination is made again: If the outlet water temperature is within a certain range and is maintained for at least 2 t 周期 , and the water temperature is above the target water temperature, the compressor operating frequency is increased by H 补偿 . If the outlet water temperature is within a certain range and is maintained for at least 2 t 周期 , and the water temperature is below the target water temperature, the compressor operating frequency is reduced H 补偿 .

2. The control method according to claim 1, characterized by, A specifically comprises the following: The ambient temperature is T 环境 The initial frequency of the compressor is set as H0 when the ambient temperature is T If the ambient temperature decreases by 1 °C, the initial frequency of the compressor decreases by AH1, until it reaches the initial minimum frequency of the compressor H 0下限 ; If the ambient temperature rises by 1 °C, the initial frequency of the compressor rises by AH2until it reaches the maximum frequency of the compressor H 0上限 .

3. The control method according to claim 1, characterized by, The control device of the battery thermal management system comprises: An initial frequency adjusting device for adjusting an initial frequency of the compressor according to an ambient temperature; The working frequency adjusting device is used for adjusting the working frequency of the compressor according to the water temperature difference △T after the compressor is started and runs at the initial frequency for an initial running time t w adjusting the working frequency of the compressor; The operating frequency adjusting device specifically adjusts the operating frequency of the compressor by the following: When △T w When the threshold range formed by the upper limit value and the lower limit value, the operating frequency of the compressor is maintained at the original initial frequency. when ΔT w when not in the threshold range, If ΔT w exceeds the upper limit, the compressor operating frequency is increased, and ΔT w is greater, the compressor operating frequency is increased more, and when the compressor operating frequency rises to H 上限 , the compressor operating frequency is no longer increased. If ΔT w is below the lower limit, the compressor operating frequency is reduced, and the greater |ΔT w | is, the more the compressor operating frequency is reduced, and when the compressor operating frequency is reduced to H 下限 , and ΔT w is less than a threshold value, the compressor is stopped. The operating frequency adjusting device can further fine adjust the operating frequency of the compressor by the following: When the compressor operating frequency is adjusted, the calculation period t is maintained 周期 The following determination is made again: If the outlet water temperature is within a certain range and is maintained for at least 2 t 周期 , and the water temperature is above the target water temperature, the compressor operating frequency is increased H 补偿 . If the outlet water temperature is within a certain range and is maintained for at least 2 t 周期 , and the water temperature is below the target water temperature, the compressor operating frequency is reduced H 补偿 .

4. The control method according to claim 3, characterized by, The initial frequency adjusting device adjusts the initial frequency of the compressor by the following: The ambient temperature is T 环境 The initial frequency of the compressor is set as H0 when the ambient temperature is T If the ambient temperature decreases by 1 °C, the initial frequency of the compressor decreases by AH1, until it reaches the initial minimum frequency of the compressor H 0下限 ; If the ambient temperature rises by 1 °C, the initial frequency of the compressor rises by AH2until it reaches the maximum frequency of the compressor H 0上限 .

5. A storage medium, characterized by The storage medium has one or more programs stored therein, which can be loaded and executed by the memory to perform the control method according to any one of claims 1-4.

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