Thermal management unit and fan control method and device thereof

Abstract

The invention discloses a heat management unit and a fan control method and device thereof. The method comprises the steps that the minimum energy efficiency ratio allowed by the heat management unit is obtained, and the maximum noise allowed by the heat management unit, the maximum exhaust pressure allowed by a compressor and the maximum heat transfer temperature difference allowed by a condenser at all environment temperatures are obtained; according to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at all the environment temperatures, the target rotating speed of the draught fan at all the environment temperatures is obtained; or according to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference under all the environment temperatures, the target rotating speed of the draught fan under all the environment temperatures is obtained; according to the environment temperatures and the target rotating speed of the draught fan at the environment temperatures, a first preset relation between the environment temperatures and the target rotating speed is obtained; in the operation process of the heat management unit, the current environment temperature is obtained in real time; based on a first preset relation, the target rotating speed of the fan is determined according to the current environment temperature; and controlling the fan to operate at the target rotating speed.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management units, and in particular to a thermal management unit and a fan control method and device thereof. Background Art

[0002] As people pursue a higher quality of life, thermal management devices such as air conditioners and refrigerators have become an indispensable part of people's lives.

[0003] The thermal management unit will generate a certain amount of noise during operation, which will affect the user's living environment. After testing, in the thermal management unit, the impact of the compressor speed on the overall noise is much smaller than the impact of the fan speed on the overall noise. Therefore, the method of reducing the fan speed is usually used to reduce the noise during the operation of the thermal management unit.

[0004] In the prior art, when the fan speed is too low, the efficiency requirements of the thermal management unit cannot be met. When the fan speed is too low, the energy efficiency ratio of the thermal management unit is too low, resulting in high power consumption and low cooling capacity. When the fan speed is too high, the exhaust pressure of the compressor is too high and the noise of the whole machine is too high, making the unit prone to fault alarm due to excessive exhaust pressure and affecting the user experience due to excessive noise. Summary of the invention

[0005] The present invention provides a thermal management unit and a fan control method and device thereof, so as to ensure that the exhaust pressure and energy efficiency ratio of the thermal management unit meet the requirements on the basis of reducing the noise of the thermal management unit.

[0006] According to one aspect of the present invention, a fan control method for a thermal management unit is provided, wherein the thermal management unit comprises: a compressor, a condenser and a fan, and the fan control method for the thermal management unit comprises:

[0007] Obtaining the minimum energy efficiency ratio allowed by the thermal management unit, as well as the maximum noise allowed by the thermal management unit at each ambient temperature, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser;

[0008] According to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each of the ambient temperatures, the target speed of the fan at each of the ambient temperatures is obtained; or, according to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference at each of the ambient temperatures, the target speed of the fan at each of the ambient temperatures is obtained;

[0009] According to each of the ambient temperatures and the target speed of the fan at each of the ambient temperatures, a first preset relationship between the ambient temperature and the target speed is obtained;

[0010] During the operation of the thermal management unit, the current ambient temperature is obtained in real time;

[0011] Based on the first preset relationship, determining a target speed of the fan according to the current ambient temperature;

[0012] The fan is controlled to run at the target speed.

[0013] Optionally, obtaining a target speed of the fan at each of the ambient temperatures according to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each of the ambient temperatures includes:

[0014] Obtaining a second preset relationship between noise and fan speed;

[0015] Based on the second preset relationship, determining the maximum allowable speed of the fan at each of the ambient temperatures according to the maximum noise at each of the ambient temperatures;

[0016] Within a range not exceeding the maximum allowable rotational speed, the target rotational speed of the fan at each of the ambient temperatures is determined according to the minimum energy efficiency ratio and the maximum exhaust pressure.

[0017] Optionally, obtaining a target speed of the fan at each of the ambient temperatures according to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference at each of the ambient temperatures includes:

[0018] Obtaining a second preset relationship between noise and fan speed;

[0019] Based on the second preset relationship, determining the maximum allowable speed of the fan at each of the ambient temperatures according to the maximum noise at each of the ambient temperatures;

[0020] Within a range not exceeding the maximum allowable rotational speed, the target rotational speed of the fan at each of the ambient temperatures is determined according to the minimum energy efficiency ratio and the maximum heat transfer temperature difference.

[0021] Optionally, within a range not exceeding the maximum allowable speed, determining the target speed of the fan at each of the ambient temperatures according to the minimum energy efficiency ratio and the maximum exhaust pressure includes:

[0022] Obtaining a third preset relationship between the energy efficiency ratio and the fan speed at each of the ambient temperatures;

[0023] Obtaining a fourth preset relationship between exhaust pressure and fan speed at each of the ambient temperatures;

[0024] Based on each of the third preset relationships, determining the maximum energy efficiency ratio at each of the ambient temperatures according to the maximum allowable rotation speed at each of the ambient temperatures;

[0025] Based on each of the fourth preset relationships, determining the minimum exhaust pressure at each of the ambient temperatures according to the maximum allowable speed at each of the ambient temperatures;

[0026] Determining whether the maximum energy efficiency ratio is greater than or equal to the minimum energy efficiency ratio, and determining whether the minimum exhaust pressure is less than or equal to the maximum exhaust pressure;

[0027] If so, the maximum allowable rotational speed is determined as the target rotational speed.

[0028] Optionally, within a range not exceeding the maximum allowable speed, determining a target speed of the fan at each of the ambient temperatures according to the minimum energy efficiency ratio and the maximum heat transfer temperature difference includes:

[0029] Obtaining a third preset relationship between the energy efficiency ratio and the fan speed at each of the ambient temperatures;

[0030] Obtaining a fifth preset relationship between the heat transfer temperature difference and the fan speed at each of the ambient temperatures;

[0031] Based on each of the third preset relationships, determining the maximum energy efficiency ratio at each of the ambient temperatures according to the maximum allowable rotation speed at each of the ambient temperatures;

[0032] Based on each of the fifth preset relationships, and according to the maximum allowable rotation speed at each of the ambient temperatures, determining a minimum heat transfer temperature difference at each of the ambient temperatures;

[0033] Determining whether the maximum energy efficiency ratio is greater than or equal to the minimum energy efficiency ratio, and determining whether the minimum heat transfer temperature difference is less than or equal to the maximum heat transfer temperature difference;

[0034] If so, the maximum allowable rotational speed is determined as the target rotational speed.

[0035] Optionally, the thermal management unit includes a constant temperature water tank;

[0036] The process of controlling the fan to operate at the target speed also includes:

[0037] Obtaining the actual temperature, current constant temperature and target constant temperature of the water in the constant temperature water tank;

[0038] The actual rotation speed of the fan is controlled according to the actual temperature, the current constant temperature and the target constant temperature.

[0039] Optionally, controlling the actual speed of the fan according to the actual temperature, the current constant temperature and the target constant temperature includes:

[0040] When the actual temperature is lower than the current constant temperature, and / or when the target constant temperature is greater than the actual temperature, obtaining the current actual exhaust pressure of the compressor and the actual heat transfer temperature difference of the condenser;

[0041] Determine whether the actual exhaust pressure is less than the maximum exhaust pressure at the current ambient temperature; or determine whether the actual heat transfer temperature difference is less than the maximum heat transfer temperature difference of the thermal management unit at the current ambient temperature;

[0042] If yes, the actual speed of the fan is controlled to decrease;

[0043] If not, the actual speed of the fan is controlled to remain at the current speed.

[0044] According to another aspect of the present invention, a fan control device of a thermal management unit is provided, wherein the thermal management unit comprises: a compressor, a condenser and a fan, and the fan control device of the thermal management unit comprises:

[0045] An information acquisition module is used to obtain the minimum energy efficiency ratio allowed by the thermal management unit, as well as the maximum noise allowed by the thermal management unit at various ambient temperatures, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser;

[0046] A target speed acquisition module, used to acquire the target speed of the fan at each of the ambient temperatures according to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each of the ambient temperatures; or to acquire the target speed of the fan at each of the ambient temperatures according to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference at each of the ambient temperatures;

[0047] A first preset relationship acquisition module, used for acquiring a first preset relationship between the ambient temperature and the target speed according to each of the ambient temperatures and the target speed of the fan at each of the ambient temperatures;

[0048] A real-time ambient temperature acquisition module is used to obtain the current ambient temperature in real time during the operation of the thermal management unit;

[0049] a target speed determination module, configured to determine a target speed of the fan according to the current ambient temperature based on the first preset relationship;

[0050] The fan control module is used to control the fan to run at the target speed.

[0051] According to another aspect of the present invention, there is provided a thermal management unit, comprising: a compressor, a condenser, a fan and a controller;

[0052] The controller is used to execute the above-mentioned fan control method of the thermal management unit.

[0053] Optionally, the thermal management unit is characterized by further comprising: a temperature sensor;

[0054] The temperature sensor is electrically and / or communicatively connected to the controller;

[0055] The temperature sensor is used to obtain the ambient temperature and send the ambient temperature to the controller.

[0056] In the embodiment of the present invention, the maximum noise allowed by the thermal management unit at each ambient temperature is first obtained according to the user's needs and the operation requirements of the thermal management unit, as well as the minimum energy efficiency ratio allowed by the thermal management unit, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser. Then, the target speed of the fan at each ambient temperature can be determined in combination with the above parameters, so that the first preset relationship between the ambient temperature and the target speed can be obtained. During the operation of the thermal management unit, the target speed of the fan can be determined according to the current ambient temperature and the first preset relationship, and the fan can be controlled to operate at the target speed. In this way, when the fan is running at the target speed, the noise of the thermal management unit can meet the user's low noise requirements, the energy efficiency ratio of the thermal management unit can meet the user's low energy consumption requirements, and the thermal management unit will not fail due to excessive compressor exhaust pressure or excessive heat transfer temperature difference of the condenser, which can effectively improve the overall performance of the thermal management unit and the user's experience.

[0057] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0059] Figure 1 is a flow chart of a fan control method for a thermal management unit provided by an embodiment of the present invention;

[0060] Figure 2 is a schematic diagram of a curve relationship provided by an embodiment of the present invention;

[0061] Figure 3It is a diagram showing the relationship between the fan speed and exhaust pressure when the ambient temperature is 35°C;

[0062] Figure 4 is a schematic diagram of a curve showing the relationship between noise and fan speed provided by an embodiment of the present invention;

[0063] Figure 5 is a flow chart of another fan control method for a thermal management unit provided by an embodiment of the present invention;

[0064] Figure 6 It is a diagram showing the relationship between the energy efficiency ratio and the fan speed when the ambient temperature is 35°C;

[0065] Figure 7 is a flow chart of another fan control method for a thermal management unit provided by an embodiment of the present invention;

[0066] Figure 8 is a flow chart of another fan control method for a thermal management unit provided by an embodiment of the present invention;

[0067] Fig. 9 It is a structural schematic diagram of a fan control device of a thermal management unit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0069] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0070] An embodiment of the present invention provides a fan control method for a thermal management unit, which can reduce the noise of the thermal management unit and make the fan speed meet the exhaust pressure requirements and energy efficiency requirements of the thermal management unit. The fan control method for the thermal management unit can be executed by the fan control device of the thermal management unit provided by the embodiment of the present invention. The fan control device of the thermal management unit can be implemented in the form of software and / or hardware, and the fan control device of the thermal management unit can be configured in the control of the thermal management unit.

[0071] Figure 1 is a flow chart of a fan control method for a thermal management unit provided by an embodiment of the present invention. Figure 1 As shown, the method includes:

[0072] S110, obtaining the minimum energy efficiency ratio allowed by the thermal management unit, and obtaining the maximum noise allowed by the thermal management unit at each ambient temperature, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser.

[0073] Specifically, for the thermal management unit, the user's requirements for noise need to be considered during the design. In this case, the working performance of the thermal management unit also needs to be considered, that is, the energy efficiency ratio of the thermal management unit and the exhaust pressure of the compressor. The heat transfer temperature difference of the condenser can also be considered. Among them, during the operation of the thermal management unit, the greater the exhaust pressure of the compressor, the higher the condensing temperature of the condenser, and thus the smaller the heat transfer temperature difference of the condenser. Therefore, as the control parameters of the fan in the thermal management unit, the exhaust pressure of the compressor and the heat transfer temperature difference of the condenser can be used selectively.

[0074] The higher the ambient temperature, the greater the required heat dissipation capacity, that is, the faster the fan speed needs to be, making the thermal management unit noisier. Therefore, different noise requirements can be set for different ambient temperatures, that is, the higher the ambient temperature, the greater the maximum noise allowed by the thermal management unit, and the lower the ambient temperature, the smaller the maximum noise allowed by the thermal management unit. Figure 2 It is a curve relationship diagram provided by an embodiment of the present invention. In the figure, the horizontal axis is the ambient temperature (unit: ° C), the vertical axis on the right is the noise sound pressure level (unit: dB (A)), and the green curve is the relationship curve between the maximum noise and the ambient temperature (interpreted in the figure as the whole machine noise Lp-control limit). The maximum noise at each ambient temperature can be determined based on the curve.

[0075] The energy efficiency ratio (COP) refers to the ratio of the rated cooling capacity to the rated power (power consumption), which is the ratio of energy conversion efficiency. The larger the energy efficiency ratio, the more electricity can be saved. The minimum energy efficiency ratio can be set according to user needs, so that in the process of adjusting the fan speed, the energy efficiency ratio of the thermal management unit must always be not lower than the minimum energy efficiency ratio to ensure the user's usage needs. Exemplarily, in an embodiment of the present invention, the minimum energy efficiency ratio is preferably set to 2.5.

[0076] The higher the ambient temperature, the faster the fan speed needs to be to ensure the heat dissipation capacity of the thermal management unit. Figure 3 This is a diagram of the curve relationship between the fan speed and the exhaust pressure when the ambient temperature is 35°C. In the figure, the left ordinate is the cooling capacity of the thermal management unit (in kW), the right ordinate is the exhaust pressure (in kPa), and the abscissa is the duty cycle of the fan drive signal (i.e., PWM signal) (in %). The green curve is the relationship between the cooling capacity and the fan speed, and the gray curve is the corresponding relationship between the exhaust pressure and the fan speed. Figure 3 It can be seen that within a certain speed range, the cooling capacity of the thermal management unit is not affected by the fan speed, and the exhaust pressure is negatively correlated with the fan speed. That is, within a certain speed range, the lower the fan speed, the greater the exhaust pressure of the compressor, and the greater the exhaust pressure, the greater the thermal management unit will malfunction. Therefore, the maximum allowable exhaust pressure of the compressor can be set for different ambient temperatures, so that during the speed adjustment process, the exhaust pressure of the compressor will not exceed the maximum exhaust pressure and cause the thermal management unit to malfunction. Figure 2 In the figure, the left vertical axis is the maximum exhaust pressure (i.e. the maximum exhaust pressure limit Phigh_limit (kPa)), and the blue curve is the relationship curve between the maximum exhaust pressure and the ambient temperature (interpreted as exhaust pressure-control limit in the figure). The maximum exhaust pressure at each ambient temperature can be determined based on this curve.

[0077] In the thermal management unit, the greater the exhaust pressure of the compressor, the higher the condensing temperature of the condenser, and the greater the heat transfer temperature difference of the condenser. Therefore, in order to avoid failure of the thermal management unit, the maximum heat transfer temperature difference allowed by the thermal management condenser can be set.

[0078] S120. Obtain the target speed of the fan at each ambient temperature according to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each ambient temperature; or, obtain the target speed of the fan at each ambient temperature according to the maximum noise, the minimum energy efficiency ratio and the minimum heat transfer temperature difference at each ambient temperature.

[0079] Specifically, Figure 4 : is a schematic diagram of a relationship curve between noise and fan speed provided by an embodiment of the present invention. In the figure: the blue dotted line is a connection curve of the actual noise of the thermal management unit at different speeds, the green dotted line is a fitting curve of the speed and noise, the horizontal axis is the duty cycle of the fan drive signal (i.e., PWM signal) (unit: %), and the vertical axis is the noise sound pressure level (unit: dB(A)). Figure 4As shown, the greater the fan speed, the higher the noise of the thermal management unit, and the relationship between the noise of the thermal management unit and the fan speed can be represented by a fitting curve. After obtaining the maximum noise allowed by the thermal management unit at each ambient temperature, the maximum fan speed allowed at each ambient temperature can be obtained. Within the range not exceeding the maximum fan speed, the target speed at each temperature can be determined in combination with the minimum energy efficiency ratio of the thermal management unit and the maximum exhaust pressure allowed by the compressor, so that when the fan is running at the target speed, the energy efficiency ratio of the thermal management unit will not be lower than the minimum energy efficiency ratio, and the exhaust pressure of the compressor will not exceed the maximum exhaust pressure. Alternatively, the target speed at each temperature can be determined in combination with the minimum energy efficiency ratio of the thermal management unit and the maximum heat transfer temperature difference allowed by the condenser, so that when the fan is running at the target speed, the energy efficiency ratio of the thermal management unit will not be lower than the minimum energy efficiency ratio, and the heat transfer temperature difference of the condenser will not exceed the maximum heat transfer temperature difference.

[0080] in, Figure 4 The gray rectangular points in the figure are multiple noise sound pressure levels when the fan PWM signal duty cycle is less than 39%, that is, Fan<39%PWM; the green triangular points are multiple noise sound pressure levels detected when the fan PWM signal duty cycle is equal to 42%, that is, Fan 42%PWM; the cyan dots are multiple noise sound pressure levels detected when the fan PWM signal duty cycle is equal to 45%, that is, Fan45%PWM; the purple triangular points are multiple noise sound pressure levels detected when the fan PWM signal duty cycle is equal to 55%, that is, Fan55%PWM; the orange dots are multiple noise sound pressure levels detected when the fan PWM signal duty cycle is equal to 60%, that is, Fan 60%PWM; the blue diamond points are multiple noise sound pressure levels detected when the fan PWM signal duty cycle is equal to 65%, that is, Fan 65%PWM; the yellow dots are multiple noise sound pressure levels detected when the fan PWM signal duty cycle is equal to 70%, that is, Fan 70% PWM; the red dots are the multiple noise sound pressure levels detected when the fan PWM signal duty cycle is equal to 75%, that is, Fan75% PWM.

[0081] S130. Obtain a first preset relationship between the ambient temperature and the target rotation speed according to each ambient temperature and the target rotation speed of the fan at each ambient temperature.

[0082] Specifically, after obtaining the target speed at each ambient temperature, the relationship between the ambient temperature and the target speed (i.e., the first preset relationship) can be obtained. In one embodiment, the first preset relationship can be a point-to-point mapping relationship between the ambient temperature and the target speed, which can be reflected as a two-dimensional data table. In another embodiment, the first preset relationship can be a fitting curve that reflects the mapping relationship between the ambient temperature and the target speed. The present invention preferably sets the first preset relationship as a fitting curve that reflects the mapping relationship between the ambient temperature and the target speed. In this way, the relationship formula of the fitting curve can be stored. When determining the ambient temperature, the target speed of the fan can be determined by directly substituting the ambient temperature into the relationship formula, which can effectively improve the control efficiency of the fan. Exemplary, continue to refer to Figure 2 In the figure, the right vertical axis is the duty cycle of the fan drive signal (unit: %), that is, the fan speed PWM (%). The orange curve (dashed line) in the figure is the first preset relationship curve between ambient temperature and target speed (the interpretation in the figure is polynomial (fan speed PWM-control limit)). The fan speed PWM control limit is the duty cycle of the PWM signal corresponding to the target speed. The functional relationship of the first preset relationship curve can be expressed as FAN PWM =0.0084*T amb 2 +0.4584*T amb +23.992, of which, FAN PWM is the duty cycle of the fan drive signal, T amb is the ambient temperature. It should be noted that Figure 2 In the figure, the orange solid line is the connection line of each target speed (interpreted as fan speed PWM-control limit in the figure). There is an error between the curve of the fitted first preset relationship and the actual connection line, which can be reduced by big data fitting.

[0083] S140. During the operation of the thermal management unit, the current ambient temperature is obtained in real time.

[0084] S150. Based on the first preset relationship, determine a target rotation speed of the fan according to the current ambient temperature.

[0085] S160, control the fan to run at the target speed.

[0086] Specifically, during the operation of the thermal management unit, the ambient temperature can be obtained in real time through the temperature sensor to adjust the fan speed according to the ambient temperature. When adjusting the fan speed, the target speed corresponding to the ambient temperature can be determined based on the first preset relationship between the ambient temperature and the target speed, and then the fan can be controlled to operate at the target speed. In this way, when the fan is running at the target speed, the noise of the thermal management unit can meet the user's low noise requirements, the energy efficiency ratio of the thermal management unit can meet the user's low energy consumption requirements, and the thermal management unit will not malfunction due to excessive compressor exhaust pressure or excessive heat transfer temperature difference of the condenser, which can effectively improve the overall performance of the thermal management unit and the user's experience.

[0087] The fan control method of the thermal management unit provided in the embodiment of the present invention first obtains the maximum noise allowed by the thermal management unit at each ambient temperature according to the user's needs and the operation requirements of the thermal management unit, and obtains the minimum energy efficiency ratio allowed by the thermal management unit, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser. Then, the target speed of the fan at each ambient temperature can be determined in combination with the above parameters, so that the first preset relationship between the ambient temperature and the target speed can be obtained. During the operation of the thermal management unit, the target speed of the fan can be determined according to the current ambient temperature and the first preset relationship, and the fan can be controlled to operate at the target speed. In this way, the noise of the thermal management unit can meet the user's low noise requirements, the energy efficiency ratio of the thermal management unit can meet the user's low energy consumption requirements, and the thermal management unit will not fail due to excessive compressor exhaust pressure or excessive heat transfer temperature difference of the condenser, which can effectively improve the overall performance of the thermal management unit and the user's experience.

[0088] Optional, Figure 5 is a flow chart of another fan control method for a thermal management unit provided by an embodiment of the present invention. Figure 5 As shown, the fan control method of the thermal management unit includes:

[0089] S210, obtaining a minimum energy efficiency ratio allowed by the thermal management unit, and obtaining a maximum noise allowed by the thermal management unit and a maximum exhaust pressure allowed by the compressor at various ambient temperatures.

[0090] S220: Obtain a second preset relationship between noise and fan speed.

[0091] Specifically, the second preset relationship between noise and fan speed can be obtained by data fitting. Figure 4 The curve (dashed line) shown is a second preset relationship between noise and fan speed, which can be expressed as L P=-17.94*FAN PWM 2 +52.125*FAN PWM +48.974. Among them, L P is the noise sound pressure level in decibels (dB(A)). PWM is the duty cycle of the fan drive signal. It can be understood that the preset relationship between the fan speed and noise will be different for thermal management units of different specifications, which is manifested in different values ​​of the quadratic coefficient, the first-order coefficient and the constant term. Each coefficient can be determined by the data fitting method.

[0092] S230. Based on the second preset relationship, determine the maximum allowable rotation speed of the fan at each ambient temperature according to the maximum noise at each ambient temperature.

[0093] Specifically, referring to the second preset relationship, it can be known that within a certain speed range, the noise is positively correlated with the fan speed, so the maximum noise can be substituted into the second preset relationship to determine the corresponding maximum allowable fan speed. Figure 2 It can be obtained that the maximum noise is 70dB at 35℃. Figure 4 The second preset relationship can determine that the duty cycle of the corresponding fan PWM signal is approximately 47%, and the maximum allowable speed is the fan speed when the duty cycle of the drive signal is 47%.

[0094] S240. Determine the target speed of the fan at each ambient temperature according to the minimum energy efficiency ratio and the maximum exhaust pressure within the range not exceeding the maximum allowable speed.

[0095] Specifically, the energy efficiency ratio corresponding to the determined target speed should not be lower than the minimum energy efficiency ratio, and the corresponding exhaust pressure should not exceed the maximum exhaust pressure, which can meet the low consumption and operation requirements of the thermal management unit on the basis of meeting the low noise requirements.

[0096] Exemplarily, within the range of not exceeding the maximum allowable speed, when determining the target speed of the fan at each ambient temperature according to the minimum energy efficiency ratio and the maximum exhaust pressure, it can be specifically implemented by the following steps S241 to S246:

[0097] S241. Obtain a third preset relationship between the energy efficiency ratio and the fan speed at each ambient temperature.

[0098] S242. Obtain a fourth preset relationship between exhaust pressure and fan speed at each ambient temperature.

[0099] S243. Based on the third preset relationships and according to the maximum allowable rotation speed at each ambient temperature, determine the maximum energy efficiency ratio at each ambient temperature.

[0100] Specifically, when the ambient temperature is constant, the energy efficiency ratio is positively correlated with the fan speed within a certain range. Figure 6 It is a schematic diagram of the curve relationship between the energy efficiency ratio and the fan speed when the ambient temperature is 35°C. In the figure, the left vertical axis is the cooling capacity of the thermal management unit (unit: kW), the right vertical axis is the energy efficiency ratio COP (unit: W / W), and the horizontal axis is the duty cycle of the fan drive signal (%). The green curve is the relationship between the cooling capacity and the fan speed, and the orange curve is the third preset relationship between the energy efficiency ratio and the fan speed. Figure 6 It can be seen that within a certain speed range, the cooling capacity of the thermal management unit is not affected by the fan speed, and the energy efficiency ratio is positively correlated with the fan speed. Therefore, the energy efficiency ratio and the fan speed can be fitted at each ambient temperature to obtain the third preset relationship between the energy efficiency ratio and the fan speed. In this way, after determining the maximum allowable speed at each ambient temperature, the maximum energy efficiency ratio at each ambient temperature can be determined based on the third preset relationship. Figure 6 At 35°C, when the duty cycle of the driving signal is 47%, the corresponding energy efficiency ratio is determined to be approximately 2.6 based on the third preset relationship, which is greater than the minimum energy efficiency ratio of 2.5. Therefore, the maximum allowable speed meets the low consumption requirement of the thermal management unit.

[0101] S244. Based on each fourth preset relationship, determine the minimum exhaust pressure at each ambient temperature according to the maximum allowable rotation speed at each ambient temperature.

[0102] Specifically, when the ambient temperature is constant, the exhaust pressure and the fan speed are negatively correlated within a certain range. Figure 3 It can be seen that within a certain speed range, the cooling capacity of the thermal management unit is not affected by the fan speed (the green curve in the figure is the relationship between the cooling capacity and the fan speed), and the exhaust pressure is negatively correlated with the fan speed. Therefore, at each ambient temperature, the exhaust pressure and the fan speed can be fitted to obtain the fourth preset relationship between the exhaust pressure and the fan speed. In this way, after determining the maximum allowable speed at each ambient temperature, the minimum exhaust pressure at each ambient temperature can be determined based on the fourth preset relationship. In the figure, when the duty cycle of the drive signal is 47%, the corresponding minimum exhaust pressure determined based on the fourth preset relationship is approximately 3550kPa. Figure 2 It can be seen that the maximum exhaust pressure at 35°C is approximately 4220 kPa, and 3550 kPa is less than the maximum exhaust pressure of 4220 kPa. Therefore, the maximum allowable speed at 35°C meets the operating requirements of the thermal management unit.

[0103] S245. Determine whether the maximum energy efficiency ratio is greater than or equal to the minimum energy efficiency ratio, and determine whether the minimum exhaust pressure is less than or equal to the maximum exhaust pressure; if so, execute step S246.

[0104] S246: Determine the maximum allowable rotation speed as the target rotation speed.

[0105] Specifically, if at a certain ambient temperature, the maximum energy efficiency ratio corresponding to the maximum allowable speed is greater than or equal to the minimum energy efficiency ratio, and the minimum exhaust pressure corresponding to the maximum allowable speed is less than or equal to the maximum exhaust pressure, then the maximum allowable speed can be directly determined as the target speed at the ambient temperature, and the target speed at each ambient temperature can be determined based on the same method. Thus, the relationship between the ambient temperature and the target speed can be further fitted to obtain the first preset relationship.

[0106] For example, if at a certain ambient temperature, the maximum energy efficiency ratio corresponding to the maximum allowable speed is less than the minimum energy efficiency ratio, the specifications of the thermal management unit can be adjusted to improve the energy efficiency ratio while meeting the low noise requirement. For example, the volume of the unit can be adjusted, the fan position can be adjusted, or the fan can be directly replaced.

[0107] Alternatively, if at a certain ambient temperature, the minimum exhaust pressure corresponding to the maximum allowable speed is greater than the maximum exhaust pressure, the specifications of the thermal management unit can be adjusted to reduce the exhaust pressure of the compressor while meeting the low noise requirement, for example, by adjusting the compressor, condenser, etc.

[0108] S250: Obtain a first preset relationship between the ambient temperature and the target rotation speed according to each ambient temperature and the target rotation speed of the fan at each ambient temperature.

[0109] S260. During the operation of the thermal management unit, the current ambient temperature is obtained in real time.

[0110] S270. Based on the first preset relationship, determine the target speed of the fan according to the current ambient temperature.

[0111] S280, control the fan to run at the target speed.

[0112] Optional, Figure 7 is a flow chart of another fan control method for a thermal management unit provided by an embodiment of the present invention. Figure 7 As shown, the fan control method of the thermal management unit includes:

[0113] S310, obtaining the minimum energy efficiency ratio allowed by the thermal management unit, and obtaining the maximum noise allowed by the thermal management unit and the maximum heat transfer temperature difference allowed by the condenser at each ambient temperature.

[0114] S320: Obtain a second preset relationship between noise and fan speed.

[0115] S330. Based on the second preset relationship, determine the maximum allowable rotation speed of the fan at each ambient temperature according to the maximum noise at each ambient temperature.

[0116] S340. Determine the target speed of the fan at each ambient temperature according to the minimum energy efficiency ratio and the maximum heat transfer temperature difference within the range not exceeding the maximum allowable speed.

[0117] Specifically, the energy efficiency ratio corresponding to the determined target speed should not be lower than the minimum energy efficiency ratio, and the corresponding heat transfer temperature difference should not exceed the maximum heat transfer temperature difference, which can meet the low consumption and operation requirements of the thermal management unit on the basis of meeting the low noise requirements.

[0118] Exemplarily, within the range of not exceeding the maximum allowable speed, when determining the target speed of the fan at each ambient temperature according to the minimum energy efficiency ratio and the maximum heat transfer temperature difference, it can be specifically implemented by the following steps S341 to S346:

[0119] S341. Obtain a third preset relationship between the energy efficiency ratio and the fan speed at each ambient temperature.

[0120] S342. Obtain a fifth preset relationship between the heat transfer temperature difference and the fan speed at each ambient temperature.

[0121] S343. Based on the third preset relationships and according to the maximum allowable rotation speed at each ambient temperature, determine the maximum energy efficiency ratio at each ambient temperature.

[0122] S344. Based on each fifth preset relationship and according to the maximum allowable rotation speed at each ambient temperature, determine the minimum heat transfer temperature difference at each ambient temperature.

[0123] S345, determine whether the maximum energy efficiency ratio is greater than or equal to the minimum energy efficiency ratio, and determine whether the minimum heat transfer temperature difference is less than or equal to the maximum heat transfer temperature difference; if so, execute step S346.

[0124] S346: Determine the maximum allowable rotation speed as the target rotation speed.

[0125] Specifically, since the greater the exhaust pressure, the greater the heat transfer temperature difference of the condenser, the principle of determining the target speed of the fan at each ambient temperature based on the minimum energy efficiency ratio and the maximum heat transfer temperature difference can be referred to the principle of determining the target speed of the fan at each ambient temperature based on the minimum energy efficiency ratio and the maximum exhaust in the above embodiment, which will not be repeated here.

[0126] S350: Obtain a first preset relationship between the ambient temperature and the target rotation speed according to each ambient temperature and the target rotation speed of the fan at each ambient temperature.

[0127] S360. During the operation of the thermal management unit, the current ambient temperature is obtained in real time.

[0128] S370. Based on the first preset relationship, determine the target speed of the fan according to the current ambient temperature.

[0129] S380, control the fan to run at the target speed.

[0130] Optional, Figure 8 is a flow chart of another fan control method for a thermal management unit provided by an embodiment of the present invention. Figure 8 As shown, the fan control method of the thermal management unit includes:

[0131] S410, obtaining the minimum energy efficiency ratio allowed by the thermal management unit, and obtaining the maximum noise allowed by the thermal management unit at each ambient temperature, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser.

[0132] S420. Obtain the target speed of the fan at each ambient temperature according to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each ambient temperature; or, obtain the target speed of the fan at each ambient temperature according to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference at each ambient temperature.

[0133] S430: Obtain a first preset relationship between the ambient temperature and the target rotation speed according to each ambient temperature and the target rotation speed of the fan at each ambient temperature.

[0134] S440. During the operation of the thermal management unit, the current ambient temperature is obtained in real time.

[0135] S450: Based on the first preset relationship, determine a target rotation speed of the fan according to the current ambient temperature.

[0136] S460, control the fan to run at the target speed.

[0137] S470. In the process of controlling the fan to run at a target speed, the actual temperature of the water in the constant temperature water tank, the current constant temperature and the target constant temperature are obtained.

[0138] Specifically, during the operation of the thermal management unit, the water temperature in the thermostatic water tank may change, which will affect the cooling capacity of the thermal management unit, or the user may need to adjust the set water temperature in the thermostatic water tank to meet their usage needs. Therefore, in the process of controlling the fan to run at the target speed, the actual temperature of the water in the thermostatic water tank, the current thermostatic temperature, and the target thermostatic temperature are obtained. Among them, the target thermostatic temperature is the thermostatic temperature set by the user when adjusting the water temperature.

[0139] S480, controlling the actual speed of the fan according to the actual temperature, the current constant temperature and the target constant temperature.

[0140] Specifically, when the actual temperature is not equal to the current constant temperature, the speed of the fan can be adjusted to make the actual temperature equal to the current constant temperature. When the target constant temperature is not equal to the actual temperature, the speed of the fan can also be adjusted to make the actual temperature equal to the target constant temperature.

[0141] In a real-time example, when controlling the fan speed according to the actual temperature, the current constant temperature and the target constant temperature, the exhaust pressure limitation and the energy efficiency ratio limitation, or the heat transfer temperature difference limitation and the energy efficiency ratio limitation can also be considered.

[0142] For example, when the actual temperature is lower than the current constant temperature, and / or the target constant temperature is greater than the actual temperature, the actual exhaust pressure of the compressor and the actual heat transfer temperature difference of the condenser can be first obtained. Then, it is determined whether the actual exhaust pressure is less than the maximum exhaust pressure at the current ambient temperature; or it is determined whether the actual heat transfer temperature difference is less than the maximum heat transfer temperature difference of the thermal management unit at the current ambient temperature. If so, the actual speed of the fan is controlled to decrease; if not, the actual speed of the fan is controlled to remain at the current speed.

[0143] Specifically, when the actual temperature is lower than the current constant temperature, the fan speed can be reduced to increase the actual temperature of the water in the constant temperature water tank so that it can be equal to the current constant temperature. Similarly, when the target constant temperature is greater than the actual temperature, the fan speed can be reduced to increase the actual temperature of the water in the constant temperature water tank so that it can be equal to the current constant temperature. Before controlling the fan speed to decrease, the current actual exhaust pressure of the thermal management unit can be obtained first. Determine whether the actual exhaust pressure is less than the maximum exhaust pressure at the current ambient temperature. If it is determined that the actual exhaust pressure is less than the maximum exhaust pressure, it means that the fan speed still has room for adjustment. At this time, the actual speed of the fan can be controlled to decrease so that the actual temperature is equal to the current constant temperature, or the actual temperature is equal to the target constant temperature.

[0144] Alternatively, before controlling the fan speed to decrease, the actual heat transfer temperature difference of the thermal management unit can be first obtained. It is determined whether the actual heat transfer temperature difference is less than the maximum heat transfer temperature difference under the current ambient temperature. If it is determined that the actual heat transfer temperature difference is less than the maximum heat transfer temperature difference, it means that the fan speed still has room for adjustment. At this time, the actual speed of the fan can be controlled to decrease so that the actual temperature is equal to the current constant temperature, or the actual temperature is equal to the target constant temperature, so as to ensure that the thermal management unit can operate without failure during the process of adjusting the water temperature of the constant temperature water tank.

[0145] In a feasible embodiment, when it is determined that the actual speed of the fan can be controlled to decrease, the temperature difference between the actual temperature and the current constant temperature can be determined, and the speed value to which the fan speed can be reduced can be determined based on the temperature difference, and then the actual speed of the fan can be directly controlled to reduce the speed value. Similarly, in the case where the target constant temperature is greater than the actual temperature, the temperature difference between the actual temperature and the target constant temperature can also be determined, and the speed value to which the fan speed can be reduced can be determined based on the temperature difference, and then the actual speed of the fan can be directly controlled to reduce the speed value.

[0146] Based on the same inventive concept, an embodiment of the present invention further provides a fan control device of a thermal management group, which is used to execute the fan control method of the thermal management group provided by any embodiment of the present invention. The fan control device of the thermal management group can be implemented by software and / or hardware. Therefore, the fan control device of the thermal management group provided by an embodiment of the present invention includes the technical features of the fan control method of the thermal management group provided by any embodiment of the present invention, and can achieve the beneficial effects of the fan control method of the thermal management group provided by any embodiment of the present invention. The similarities can be referred to the above description of the fan control method of the thermal management group provided by the embodiment of the present invention, and will not be repeated here.

[0147] Among them, the thermal management unit includes: compressor, condenser and fan. Fig. 9 1 is a schematic diagram of the structure of a fan control device of a thermal management unit provided by an embodiment of the present invention. The fan control device of the thermal management unit includes: an information acquisition module 100, which is used to obtain the minimum energy efficiency ratio allowed by the thermal management unit, and obtain the maximum noise allowed by the thermal management unit, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser at each ambient temperature; a target speed acquisition module 200, which is used to obtain the target speed of the fan at each ambient temperature according to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each ambient temperature; or, according to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference at each ambient temperature, obtain the target speed of the fan at each ambient temperature; a first preset relationship acquisition module 300, which is used to obtain a first preset relationship between the ambient temperature and the target speed of the fan at each ambient temperature; an ambient temperature real-time acquisition module 400, which is used to obtain the current ambient temperature in real time during the operation of the thermal management unit; a target speed determination module 500, which is used to determine the target speed of the fan according to the current ambient temperature based on the first preset relationship; and a fan control module 600, which is used to control the fan to run at the target speed.

[0148] The fan control device of the thermal management unit provided in the embodiment of the present invention can ensure that the noise of the thermal management unit meets the user's low noise requirement, the energy efficiency ratio of the thermal management unit meets the user's low energy consumption requirement, and the thermal management unit will not malfunction due to excessive compressor exhaust pressure or excessive heat transfer temperature difference of the condenser. It can effectively improve the overall performance of the thermal management unit and the user's experience.

[0149] Based on the same inventive concept, an embodiment of the present invention further provides a thermal management unit, which includes at least main structures such as a compressor, a condenser, a fan and a controller. Among them, the controller is used to execute the fan control method of the thermal management unit provided by any embodiment of the present invention. Therefore, the thermal management unit provided by the embodiment of the present invention includes the technical features of the fan control method of the thermal management unit provided by any embodiment of the present invention, and can achieve the beneficial effects of the fan control method of the thermal management unit provided by any embodiment of the present invention. The similarities can be referred to the above description of the fan control method of the thermal management unit provided by the embodiment of the present invention, and will not be repeated here.

[0150] Exemplarily, the thermal management unit also includes: a temperature sensor; the temperature sensor can be electrically and / or communicatively connected to the controller; the temperature sensor is used to obtain the ambient temperature and send the ambient temperature to the controller so that the controller can implement the fan control method of the thermal management unit provided in any of the above embodiments.

[0151] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0152] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A fan control method for a thermal management unit, the thermal management unit comprising: The compressor, condenser and fan are characterized in that the fan control method of the thermal management unit includes: Obtaining the minimum energy efficiency ratio allowed by the thermal management unit, as well as the maximum noise allowed by the thermal management unit at each ambient temperature, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser; According to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each of the ambient temperatures, the target speed of the fan at each of the ambient temperatures is obtained; or, according to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference at each of the ambient temperatures, the target speed of the fan at each of the ambient temperatures is obtained; According to each of the ambient temperatures and the target speed of the fan at each of the ambient temperatures, a first preset relationship between the ambient temperature and the target speed is obtained; During the operation of the thermal management unit, the current ambient temperature is obtained in real time; Based on the first preset relationship, determining a target speed of the fan according to the current ambient temperature; The fan is controlled to run at the target speed.

2. The fan control method of the thermal management unit according to claim 1, characterized in that: According to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each of the ambient temperatures, the target speed of the fan at each of the ambient temperatures is obtained, including: Obtaining a second preset relationship between noise and fan speed; Based on the second preset relationship, determining the maximum allowable speed of the fan at each of the ambient temperatures according to the maximum noise at each of the ambient temperatures; Within a range not exceeding the maximum allowable rotational speed, the target rotational speed of the fan at each of the ambient temperatures is determined according to the minimum energy efficiency ratio and the maximum exhaust pressure.

3. The fan control method of the thermal management unit according to claim 1, characterized in that: According to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference at each of the ambient temperatures, the target speed of the fan at each of the ambient temperatures is obtained, including: Obtaining a second preset relationship between noise and fan speed; Based on the second preset relationship, determining the maximum allowable speed of the fan at each of the ambient temperatures according to the maximum noise at each of the ambient temperatures; Within a range not exceeding the maximum allowable rotational speed, the target rotational speed of the fan at each of the ambient temperatures is determined according to the minimum energy efficiency ratio and the maximum heat transfer temperature difference.

4. The fan control method of the thermal management unit according to claim 2, characterized in that: Determining the target speed of the fan at each of the ambient temperatures according to the minimum energy efficiency ratio and the maximum exhaust pressure within a range not exceeding the maximum allowable speed includes: Obtaining a third preset relationship between the energy efficiency ratio and the fan speed at each of the ambient temperatures; Obtaining a fourth preset relationship between exhaust pressure and fan speed at each of the ambient temperatures; Based on each of the third preset relationships, determining the maximum energy efficiency ratio at each of the ambient temperatures according to the maximum allowable rotation speed at each of the ambient temperatures; Based on each of the fourth preset relationships, and according to the maximum allowable rotational speed at each of the ambient temperatures, determining the minimum exhaust pressure at each of the ambient temperatures; Determining whether the maximum energy efficiency ratio is greater than or equal to the minimum energy efficiency ratio, and determining whether the minimum exhaust pressure is less than or equal to the maximum exhaust pressure; If so, the maximum allowable rotational speed is determined as the target rotational speed.

5. The fan control method of the thermal management unit according to claim 3, characterized in that: Determining the target speed of the fan at each of the ambient temperatures within a range not exceeding the maximum allowable speed according to the minimum energy efficiency ratio and the maximum heat transfer temperature difference includes: Obtaining a third preset relationship between the energy efficiency ratio and the fan speed at each of the ambient temperatures; Obtaining a fifth preset relationship between the heat transfer temperature difference and the fan speed at each of the ambient temperatures; Based on each of the third preset relationships, determining the maximum energy efficiency ratio at each of the ambient temperatures according to the maximum allowable rotation speed at each of the ambient temperatures; Based on each of the fifth preset relationships, and according to the maximum allowable rotation speed at each of the ambient temperatures, determining a minimum heat transfer temperature difference at each of the ambient temperatures; Determining whether the maximum energy efficiency ratio is greater than or equal to the minimum energy efficiency ratio, and determining whether the minimum heat transfer temperature difference is less than or equal to the maximum heat transfer temperature difference; If so, the maximum allowable rotational speed is determined as the target rotational speed.

6. The fan control method of the thermal management unit according to claim 1, characterized in that: The thermal management unit includes a constant temperature water tank; The process of controlling the fan to operate at the target speed also includes: Obtaining the actual temperature, current constant temperature and target constant temperature of the water in the constant temperature water tank; The actual rotation speed of the fan is controlled according to the actual temperature, the current constant temperature and the target constant temperature.

7. The fan control method of the thermal management unit according to claim 6, characterized in that: According to the actual temperature, the current constant temperature and the target constant temperature, controlling the actual speed of the fan includes: When the actual temperature is lower than the current constant temperature, and / or when the target constant temperature is greater than the actual temperature, obtaining the current actual exhaust pressure of the compressor and the actual heat transfer temperature difference of the condenser; Determine whether the actual exhaust pressure is less than the maximum exhaust pressure at the current ambient temperature; or determine whether the actual heat transfer temperature difference is less than the maximum heat transfer temperature difference of the thermal management unit at the current ambient temperature; If yes, the actual speed of the fan is controlled to decrease; If not, the actual speed of the fan is controlled to remain at the current speed.

8. A fan control device for a thermal management unit, the thermal management unit comprising: The compressor, condenser and fan are characterized in that the fan control device of the thermal management unit includes: An information acquisition module is used to obtain the minimum energy efficiency ratio allowed by the thermal management unit, as well as the maximum noise allowed by the thermal management unit at various ambient temperatures, the maximum exhaust pressure allowed by the compressor, and the maximum heat transfer temperature difference allowed by the condenser; A target speed acquisition module, used to acquire the target speed of the fan at each of the ambient temperatures according to the maximum noise, the minimum energy efficiency ratio and the maximum exhaust pressure at each of the ambient temperatures; or to acquire the target speed of the fan at each of the ambient temperatures according to the maximum noise, the minimum energy efficiency ratio and the maximum heat transfer temperature difference at each of the ambient temperatures; A first preset relationship acquisition module, used for acquiring a first preset relationship between the ambient temperature and the target speed according to each of the ambient temperatures and the target speed of the fan at each of the ambient temperatures; A real-time ambient temperature acquisition module is used to obtain the current ambient temperature in real time during the operation of the thermal management unit; a target speed determination module, configured to determine a target speed of the fan according to the current ambient temperature based on the first preset relationship; The fan control module is used to control the fan to run at the target speed.

9. A thermal management unit, characterized in that: include: Compressors, condensers, fans and controllers; The controller is used to execute the fan control method of the thermal management unit according to any one of claims 1 to 7.

10. The thermal management unit according to claim 9, characterized in that: Also includes: Temperature sensor; The temperature sensor is electrically and / or communicatively connected to the controller; The temperature sensor is used to obtain the ambient temperature and send the ambient temperature to the controller.

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