Voltage adjusting method and device of electronic fan and vehicle

Abstract

The invention provides a voltage regulation method and device for an electronic fan and a vehicle. Temperature control parameters are periodically collected, a duty ratio request signal and current control voltage of the electronic fan are collected in real time, and a voltage regulation instruction is output according to the duty ratio request signal, the periodically collected temperature control parameters and the current control voltage. And the control voltage of the electronic fan is dynamically and smoothly adjusted according to the voltage adjusting instruction, the control voltage of the electronic fan can be dynamically and smoothly adjusted, the heat dissipation performance is improved, energy consumption is reduced, and the optimal balance of the heat dissipation performance and the energy consumption is achieved.

Description

Technical Field

[0001] The present invention relates to the field of vehicle electronics, and particularly to a method and device for voltage regulation of an electric fan and a vehicle. Background Art

[0002] With the development of new energy vehicle models, the thermal load of the power system has increased significantly. Its heat dissipation requirements not only need to cover the traditional engine, but also need to take into account components such as motors, electronic controls, and power batteries. In the prior art, due to the compact layout of the engine compartment of new energy vehicle models, the thickness of the heat dissipation module has increased but the space has not expanded, so that the traditional 12V electric fan is limited by voltage, and the maximum speed and air volume are difficult to meet the high-load heat dissipation requirements, resulting in a contradiction between heat dissipation capacity and space. And the traditional thermal management strategy is based on fixed voltage power supply, which cannot flexibly adjust the fan driving ability according to the real-time working conditions, has insufficient dynamic demand response, and is prone to heat dissipation insufficiency or energy waste. If the 24V platform power supply is directly adopted, although the fan performance can be improved, it will lead to an increase in the energy consumption of the low-voltage system, and an additional 24V electrical architecture needs to be adapted, with high costs.

[0003] Therefore, how to ensure the balance between heat dissipation performance and energy consumption in vehicle thermal management is an urgent problem to be solved currently. Summary of the Invention

[0004] In view of this, the embodiments of the present invention are committed to providing a method and device for voltage regulation of an electric fan and a vehicle. By dynamically and smoothly regulating the control voltage of the electric fan, the heat dissipation performance can be improved, the energy consumption can be reduced, and the optimal balance between heat dissipation performance and energy consumption can be achieved.

[0005] To achieve the above technical objectives, the embodiments of the present specification provide the following technical solutions:

[0006] In a first aspect, an embodiment of the present application provides a method for voltage regulation of an electric fan, which is applied to a vehicle controller. The method for voltage regulation of the electric fan includes: periodically collecting temperature control parameters, and real-time collecting a duty ratio request signal of the electric fan and a current control voltage for controlling the electric fan; outputting a voltage regulation instruction according to the duty ratio request signal, the periodically collected temperature control parameters, and the current control voltage; and dynamically and smoothly regulating the control voltage of the electric fan according to the voltage regulation instruction.

[0007] Optionally, the temperature parameter includes the engine water temperature, the electric drive temperature, or the battery temperature; the output of the voltage regulation instruction according to the duty ratio request signal, the temperature control parameter collected periodically, and the current control voltage includes: if the duty ratio request signal is greater than or equal to the duty ratio threshold, output a first boost regulation instruction, and the first boost regulation instruction is used to indicate dynamically increasing the control voltage; if the engine water temperature, the electric drive temperature, and / or the battery temperature is greater than or equal to the corresponding reference threshold, and the rotation speed of the electric fan under the current control voltage cannot meet the heat dissipation requirement, output a second boost regulation instruction, and the second boost regulation instruction is used to indicate regulating the control voltage to a first voltage.

[0008] Optionally, the output of the voltage regulation instruction according to the duty ratio request signal, the temperature control parameter collected periodically, and the current control voltage further includes: determining the heat dissipation requirement according to the electric drive temperature, the battery temperature, and the engine water temperature collected periodically; determining the water temperature drop rate according to the engine water temperature collected periodically; and outputting a voltage regulation instruction according to the water temperature drop rate and the heat dissipation requirement.

[0009] Optionally, the output of the voltage regulation instruction according to the water temperature drop rate and the heat dissipation requirement includes: determining whether the heat dissipation performance meets the standard according to the water temperature drop rate and the heat dissipation requirement; if the heat dissipation performance meets the standard and the current control voltage is greater than or equal to a second voltage, output a buck regulation instruction; if the heat dissipation performance does not meet the standard and the current control voltage is less than or equal to the first voltage, output the first boost regulation instruction.

[0010] Optionally, the output of the voltage regulation instruction according to the water temperature drop rate and the heat dissipation requirement includes: if the heat dissipation requirement decreases and the current control voltage is greater than the second voltage, output a buck regulation instruction.

[0011] Optionally, the dynamic and smooth regulation of the control voltage of the electric fan according to the voltage regulation instruction includes: if the voltage regulation instruction is the first boost regulation instruction, apply the PID algorithm to regulate the control voltage to gradually and smoothly increase the voltage from the current control voltage according to a preset gradient; if the voltage regulation instruction is the second boost regulation instruction, apply the PID algorithm to regulate the control voltage to smoothly regulate to the first voltage from the current control voltage according to a preset gradient; if the voltage regulation instruction is the buck regulation instruction, apply the PID algorithm to regulate the control voltage to gradually and smoothly decrease the voltage from the current control voltage according to a preset gradient.

[0012] Optionally, applying the PID algorithm to adjust the control voltage to gradually and smoothly increase the voltage from the current control voltage according to a preset gradient includes: applying the PID algorithm to adjust the control voltage to rise from the current level corresponding to the current control voltage to the previous level; adjusting the control voltage to stay at the adjusted level for a preset time, and detecting whether the heat dissipation performance meets the standard at the voltage of the adjusted level; if the heat dissipation performance does not meet the standard, applying the PID algorithm to adjust the control voltage to continue rising to the previous level until it is detected that the heat dissipation performance meets the standard at the voltage of the adjusted level.

[0013] Optionally, applying the PID algorithm to adjust the control voltage to gradually and smoothly decrease the voltage from the current control voltage according to a preset gradient includes: applying the PID algorithm to adjust the control voltage to drop from the current level corresponding to the current control voltage to the next level; adjusting the control voltage to stay at the adjusted level for a preset time, and detecting whether the heat dissipation performance meets the standard at the voltage of the adjusted level; if the heat dissipation performance meets the standard, applying the PID algorithm to adjust the control voltage to continue dropping to the next level until the control voltage is adjusted to the second voltage.

[0014] In a second aspect, an embodiment of the present application further provides a voltage regulation device for an electric fan, which is applied to a vehicle controller. The device includes: a data acquisition module, configured to periodically acquire temperature control parameters, and in real time acquire a duty cycle request signal of the electric fan and the current control voltage for controlling the electric fan; a command control module, configured to output a voltage regulation command according to the duty cycle request signal, the periodically acquired temperature control parameters, and the current control voltage; a voltage regulation module, configured to dynamically and smoothly regulate the control voltage of the electric fan according to the voltage regulation command.

[0015] In a third aspect, an embodiment of the present application further provides a vehicle, including: a memory, configured to store executable program code; a processor, configured to call and run the executable program code from the memory, so that the vehicle executes the foregoing method.

[0016] It can be seen from the above technical solutions that the voltage regulation method for an electric fan provided in the embodiments of this specification periodically acquires temperature control parameters, and in real time acquires a duty cycle request signal and the current control voltage of the electric fan, and outputs a voltage regulation command according to the duty cycle request signal, the periodically acquired temperature control parameters, and the current control voltage, so that the voltage regulation command changes following the duty cycle request signal, the periodically acquired temperature control parameters, and the current control voltage, and further dynamically and smoothly regulates the control voltage of the electric fan, which can improve the heat dissipation performance, reduce energy consumption, and achieve the optimal balance between heat dissipation performance and energy consumption.

[0017] The above description is only an overview of the technical solution of the present disclosure. In order to better understand the technical means of the present disclosure, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present disclosure more obvious and understandable, the following specifically illustrates the specific embodiments of the present disclosure. Brief Description of the Drawings

[0018] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be a limitation of the present disclosure. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0019] Figure 1 Shows a schematic diagram of a system framework provided by an embodiment of the present application;

[0020] Figure 2 Shows a schematic flowchart of a method for regulating the voltage of an electric fan provided by an embodiment of the present application;

[0021] Figure 3 Shows a mapping relationship diagram between the rotational speed and the control voltage of an electric fan provided by an embodiment of the present application;

[0022] Figure 4 Shows a schematic diagram of a method for regulating the voltage of an electric fan provided by an embodiment of the present application;

[0023] Figure 5 Shows a schematic diagram of stepwise regulation of the control voltage of an electric fan provided by an embodiment of the present application;

[0024] Figure 6 Shows a schematic structural diagram of a voltage regulating device for an electric fan provided by an embodiment of the present application;

[0025] Figure 7 Shows a schematic structural diagram of a vehicle provided by an embodiment of the present application. Detailed Embodiments

[0026] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this specification should have the ordinary meaning understood by those of ordinary skill in the art to which this specification belongs. The "first", "second" and similar terms used in the embodiments of this specification do not indicate any order, quantity or importance, but are only used to avoid confusion of components.

[0027] Unless otherwise required by the context, throughout the specification, "a plurality of" means "at least two", and "comprising" is interpreted in an open, inclusive sense, that is, "including, but not limited to". In the description of the specification, terms such as "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" are intended to indicate that specific features, structures, materials, or characteristics related to the embodiment or example are included in at least one embodiment or example of the present specification. The schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0028] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0029] With the development of new energy vehicle models, the thermal load of the power system has increased significantly. Its heat dissipation requirements not only need to cover the traditional engine but also need to take into account components such as motors, electronic controls, and power batteries. In the prior art, an electronic fan is configured for heat dissipation. Since the heat generated during the load operation of a pure electric vehicle is relatively large, the power of the matched electronic fan is also relatively high. In the prior art, a 12V or 24V platform is commonly used to control the electronic fan. However, there are the following pain points:

[0030] 1. Conflict between heat dissipation capacity and space: The engine compartment layout of new energy vehicle models is compact. The thickness of the heat dissipation module increases but the space does not expand. The traditional 12V electronic fan is limited by the voltage, and the maximum speed and air volume are difficult to meet the high-load heat dissipation requirements.

[0031] 2. Imbalance between energy consumption and performance: If the 24V platform is directly used for power supply, although the fan performance can be improved, it will cause an increase in the energy consumption of the low-voltage system and additional adaptation of the 24V electrical architecture is required, resulting in high costs.

[0032] 3. Insufficient dynamic demand response: The traditional thermal management strategy is based on a fixed voltage power supply and cannot flexibly adjust the fan driving ability according to real-time working conditions, easily resulting in insufficient heat dissipation or energy waste.

[0033] Based on this, the present application provides a system framework, as Figure 1 shown. The system mainly includes: an electronic fan, a voltage converter DCDC, a vehicle controller VCU, and a battery management system BMS. The vehicle controller VCU is connected to the voltage converter DCDC and the battery management system BMS, and the voltage converter DCDC is connected to the electronic fan and the battery management system BMS.

[0034] The vehicle controller VCU obtains a voltage regulation command based on the duty ratio request signal, the temperature control parameters collected periodically, and the current control voltage, and outputs it to the battery management system BMS and the voltage converter DCDC. The battery management system BMS outputs a voltage to the voltage converter DCDC according to the voltage regulation command. The voltage converter DCDC converts the voltage output by the battery management system BMS to the corresponding control voltage according to the voltage regulation command to control the rotation speed of the electric fan.

[0035] The system monitors the thermal management requirements in real time through the vehicle controller VCU, and dynamically adjusts the output voltage (12V - 24V) of the voltage converter DCDC. It only boosts the voltage to 24V to increase the rotation speed of the electric fan when the heat dissipation requirement reaches the limit, and maintains a 12V power supply under normal conditions to reduce energy consumption. The system integrates voltage regulation, closed-loop control of the fan rotation speed, and thermal management cooperation algorithms, and periodically collects temperature parameters and the duty ratio request signal of the fan, so as to obtain the target rotation speed of the electric fan determined by the duty ratio request signal and the current power supply capacity, and then dynamically adjusts the control voltage of the electric fan. In this way, the control voltage of the electric fan follows the duty ratio request signal, the temperature control parameters collected periodically, and the current control voltage changes, which can improve the heat dissipation performance, reduce energy consumption, and achieve the optimal balance between heat dissipation performance and energy consumption.

[0036] Based on the above system, to solve the technical problem of the imbalance between the heat dissipation performance and energy consumption of the electric fan, this application provides a voltage regulation method for the electric fan, as Figure 2 shown, Figure 2 is a schematic flowchart of a voltage regulation method for an electric fan provided by an embodiment of this application. This voltage regulation method for the electric fan can be applied to a vehicle controller. This voltage regulation method for the electric fan includes:

[0037] Step S11: Periodically collect temperature control parameters, and collect the duty ratio request signal of the electric fan and the current control voltage for controlling the electric fan in real time.

[0038] Before step S11, after the vehicle wakes up, the vehicle controller VCU loads the thermal management strategy and initializes the duty ratio threshold A of the electric fan. This duty ratio threshold is the maximum demand value for ensuring the heat dissipation performance of the electric fan when it operates in the 12V reference voltage mode. At the same time, the low-voltage protection threshold B and the high-voltage protection threshold C of the voltage converter DCDC are also set. The low-voltage protection threshold B and the high-voltage protection threshold C are used to determine voltage abnormalities. The duty ratio threshold A, the low-voltage protection threshold B, and the high-voltage protection threshold C can be set as needed. For example, the duty ratio threshold A is set to 80% or 70%, corresponding to an electric fan rotation speed of 2500 rpm, the low-voltage protection threshold B is set to 11V, and the high-voltage protection threshold C is set to 25V. Of course, in other embodiments of this application, other values can also be set, and specific limitations are not made here.

[0039] In some embodiments, multiple temperature sensors may be set in the system to collect the temperatures of multiple parts in the system. A voltage sensor may be applied to detect in real time the current control voltage output by the DC-DC voltage converter for controlling the operation of the electric fan. The greater the current control voltage, the faster the rotation speed of the electric fan and the better the heat dissipation capacity. Meanwhile, the duty cycle request signal of the electric fan is collected in real time, and the target rotation speed of the electric fan can be obtained according to the duty cycle request signal. The greater the target rotation speed, the greater the heat dissipation requirement of the electric fan.

[0040] Step S12: Output a voltage regulation instruction according to the duty cycle request signal, the temperature control parameters collected periodically, and the current control voltage.

[0041] In the embodiment of the present application, according to the duty cycle request signal, the temperature control parameters collected periodically, and the current control voltage, the current heat dissipation requirement and heat dissipation capacity of the electric fan can be obtained, and then it can be determined whether to increase or decrease the heat dissipation capacity of the electric fan, so as to output the corresponding voltage regulation instruction. For example, the greater the target rotation speed of the electric fan determined according to the duty cycle request signal, the greater the heat dissipation requirement of the electric fan, and the control voltage needs to be increased. If it is determined according to the duty cycle request signal, the temperature control parameters collected periodically, and the current control voltage that the heat dissipation requirement increases, or the heat dissipation capacity cannot meet the heat dissipation requirement, the control voltage also needs to be increased. If it is determined according to the duty cycle request signal, the temperature control parameters collected periodically, and the current control voltage that the heat dissipation requirement decreases and the current control voltage is relatively large, the control voltage can be considered to be decreased.

[0042] Step S13: Dynamically and smoothly regulate the control voltage of the electric fan according to the voltage regulation instruction.

[0043] The control voltage range of the electric fan can be divided into multiple levels. If the control voltage needs to be increased or decreased according to the voltage regulation instruction, the control voltage is increased step by step from the current control voltage, and when the control voltage increases / decreases from one level to an adjacent level, the control voltage is smoothly regulated to the adjacent level.

[0044] The voltage regulation method of the electric fan in the present application collects the temperature control parameters periodically, collects the duty cycle request signal and the current control voltage of the electric fan in real time, outputs a voltage regulation instruction according to the duty cycle request signal, the temperature control parameters collected periodically, and the current control voltage, makes the voltage regulation instruction follow the changes of the duty cycle request signal, the temperature control parameters collected periodically, and the current control voltage, and then dynamically and smoothly regulates the control voltage of the electric fan, which can improve the heat dissipation performance, reduce the energy consumption, and achieve the optimal balance between the heat dissipation performance and the energy consumption.

[0045] To more clearly illustrate the technical solution provided by the embodiments of the present application, the following further describes a voltage regulation method for an electronic fan provided by the present application.

[0046] In step S12, the temperature parameters include the engine water temperature, the electric drive temperature, or the battery temperature. Optionally, if the duty cycle request signal is greater than or equal to the duty cycle threshold, a first boost regulation instruction is output, and the first boost regulation instruction is used to indicate dynamically increasing the control voltage. It should be noted that the control voltage is less than or equal to the first voltage, that is, after the control voltage is dynamically increased to the first voltage according to the first boost regulation instruction, the control voltage will not increase any further. The duty cycle request signal being greater than or equal to the duty cycle threshold indicates that the heat dissipation requirement of the electronic fan is exceeded. At this time, it is necessary to increase the heat dissipation performance of the electronic fan. Considering that the control voltage only needs to be increased to meet the heat dissipation requirement, a first boost regulation instruction is output to indicate dynamically increasing the control voltage. In this way, the voltage regulation instruction can be dynamically obtained according to the heat dissipation requirement, optimizing the energy consumption while improving the heat dissipation performance of the electronic fan, thereby achieving the optimal balance between the heat dissipation performance and the energy consumption.

[0047] If the engine water temperature, the electric drive temperature, and / or the battery temperature is greater than or equal to the corresponding reference threshold, and the rotational speed of the electric fan under the current control voltage cannot meet the heat dissipation requirement, then a second boost adjustment instruction is output. The second boost adjustment instruction is used to indicate adjusting the control voltage to a first voltage. Among them, the reference thresholds corresponding to the engine water temperature, the electric drive temperature, and the battery temperature can be set as needed. For example, the engine water temperature, the electric drive temperature, and the battery temperature are set to 65°C, 45°C, and 115°C respectively. The engine water temperature, the electric drive temperature, or the battery temperature being greater than or equal to the corresponding reference threshold means that at least one of the engine water temperature, the electric drive temperature, and the battery temperature is greater than or equal to the corresponding reference threshold. It can be any one of the engine water temperature, the electric drive temperature, and the battery temperature being greater than or equal to the corresponding reference threshold, or any two of them being greater than or equal to the corresponding reference threshold, or all three temperatures being greater than or equal to the corresponding reference threshold. The engine water temperature is the cooling water temperature of the system. When the engine water temperature is greater than the corresponding reference threshold, it indicates that the heat dissipation capacity of the electric fan does not meet the standard, and it is necessary to rapidly improve the heat dissipation capacity of the electric fan. The electric drive temperature refers to the temperature of the motor and the motor controller. When the electric drive temperature is greater than or equal to the corresponding threshold, it indicates that the temperature of the motor and the motor controller is too high and the heat dissipation capacity does not meet the standard. Similarly, it is necessary to rapidly improve the heat dissipation capacity of the electric fan. The battery temperature is the temperature of the storage battery. When the battery temperature is greater than or equal to the corresponding reference threshold, it indicates that the power supply temperature is too high and the heat dissipation capacity does not meet the standard. Similarly, it is necessary to rapidly improve the heat dissipation capacity of the electric fan. When the engine water temperature, the electric drive temperature, or the battery temperature is greater than or equal to the corresponding reference threshold, and the rotational speed of the electric fan under the current control voltage cannot meet the heat dissipation requirement, a second boost adjustment instruction is directly output to indicate adjusting the control voltage to the first voltage. That is, the second boost adjustment instruction indicates directly and smoothly adjusting the control voltage of the electric fan to the first voltage, and there is no need to perform a threshold judgment process during this process, so as to ensure a fast response and rapidly improve the heat dissipation performance of the electric fan. The first voltage is preferably 24V. Driven by 24V high voltage, the maximum rotational speed of the electric fan increases by about 40%, and the air volume increases significantly, meeting the high-load heat dissipation requirements of new energy vehicle models.

[0048] In order to accurately output a voltage adjustment instruction that dynamically meets the heat dissipation requirement, in some embodiments of the present application, when outputting a voltage adjustment instruction according to a duty cycle request signal, periodically collected temperature control parameters, and the current control voltage, the heat dissipation requirement is determined according to the periodically collected electric drive temperature, battery temperature, and engine water temperature; the water temperature decrease rate is determined according to the periodically collected engine water temperature; and a voltage adjustment instruction is output according to the water temperature decrease rate and the heat dissipation requirement.

[0049] Among them, the heat dissipation requirement can be directly determined based on the periodically collected electric drive temperature, battery temperature, and engine water temperature. For example, the electric drive temperature, battery temperature, and engine water temperature can be respectively compared with the corresponding reference temperatures. If it is greater than or equal to the reference temperature, it indicates that the heat dissipation requirement increases and the heat dissipation capacity needs to be increased. The reference temperature can be set according to requirements or experience. It is also possible to obtain the corresponding heat dissipation requirement values based on the periodically collected electric drive temperature, battery temperature, and engine water temperature, and then determine the heat dissipation requirement. A corresponding relationship table between the electric drive temperature, battery temperature, engine water temperature, and heat dissipation requirement values can be preset in the vehicle controller respectively. After detecting the electric drive temperature, battery temperature, and engine water temperature, the heat dissipation requirement value corresponding to the electric drive temperature is found according to the preset relationship table between the electric drive temperature and heat dissipation requirement, the heat dissipation requirement value corresponding to the battery temperature is found according to the preset relationship table between the battery temperature and heat dissipation requirement, and the heat dissipation requirement value corresponding to the engine water temperature is found according to the preset relationship table between the engine water temperature and heat dissipation requirement. Then, the maximum value among the heat dissipation requirement values is taken as the final heat dissipation requirement. Calculate the temperature drop per minute or per second based on the periodically collected engine water temperature to obtain the water temperature drop rate, and the water temperature drop rate characterizes the heat dissipation capacity of the electric fan. Then, determine whether to increase or decrease the control voltage based on the heat dissipation requirement and the water temperature drop rate, and output a voltage adjustment command. It should be noted that if the engine water temperature rises, the obtained water temperature drop rate is negative. In other embodiments of the present application, it is not limited to detecting the electric drive temperature, battery temperature, and engine water temperature, and other components related to the electric fan can also be detected. The voltage adjustment command obtained in this way is generated in real time and dynamically according to the heat dissipation requirement and the water temperature drop rate, which can ensure the heat dissipation capacity of the electric fan while not causing energy waste, that is, achieving the optimal balance between heat dissipation performance and energy consumption.

[0050] In order to more accurately determine the voltage regulation command that dynamically meets the heat dissipation requirements, an alternative embodiment is provided in the embodiments of the present application. The heat dissipation performance is determined based on the water temperature drop rate and the heat dissipation requirements. If the heat dissipation performance meets the standard and the current control voltage is greater than or equal to the second voltage, a step-down regulation command is output. If the heat dissipation performance does not meet the standard and the current control voltage is less than or equal to the first voltage, a first step-up regulation command is output. Determining whether the heat dissipation performance meets the standard based on the water temperature drop rate and the heat dissipation requirements can be achieved by determining whether it is necessary to increase the heat dissipation requirements. The first voltage is preferably 24V, indicating that the electric fan operates in the high-voltage drive mode. The second voltage is preferably 12V, indicating that the electric fan operates in the reference voltage mode. The current control voltage being less than or equal to the first voltage indicates that there is still room for the control voltage of the electric fan to increase, and the heat dissipation capacity of the electric fan can be further improved through voltage regulation. The current control voltage being greater than or equal to the second voltage indicates that there is still room for the control voltage of the electric fan to decrease, and the energy consumption of the electric fan can be further reduced through voltage regulation. For example, if the water temperature drop rate is less than or equal to the heat dissipation requirements, it means that it is necessary to increase the heat dissipation requirements and the heat dissipation performance does not meet the standard. If the current control voltage is less than or equal to the first voltage, a first step-up regulation command is output. If the water temperature drop rate is greater than the heat dissipation requirements, it means that the heat dissipation performance meets the standard. If the current control voltage is greater than or equal to the second voltage, it means that the control voltage of the electric fan can be reduced to reduce the energy consumption, that is, a step-down regulation command is output. In this way, by controlling the output voltage regulation command to follow the heat dissipation performance in real time, the optimal balance between the heat dissipation performance and the energy consumption can be achieved, while being compatible with the 12V / 24V platform, without the need to modify the existing low-voltage electrical architecture, reducing the hardware cost.

[0051] In some embodiments, if the heat dissipation requirements decrease and the current control voltage is greater than the second voltage, a step-down regulation command is output. The decrease in the heat dissipation requirements can be that at least one of the engine water temperature, the electric drive temperature, and the battery temperature decreases, or the duty cycle request signal is lower than the duty cycle threshold A, and the engine water temperature, the electric drive temperature, and the battery temperature remain stable. The current control voltage being greater than the second voltage means that there is still room for the control voltage of the electric fan to decrease. Thus, a step-down regulation command can be output to reduce the control voltage of the electric fan, thereby reducing the energy consumption. By only boosting when necessary and minimizing the control voltage of the electric fan when not necessary, the energy consumption is reduced by more than 30% compared to the fixed 24V system.

[0052] In some embodiments of the present application, in order to more precisely output a voltage regulation instruction to dynamically regulate the control voltage, the voltage regulation method of the electronic fan further includes: if the output voltage of the voltage converter DCDC, that is, the control voltage of the electronic fan, is less than or equal to the low-voltage protection threshold B, it indicates that the power supply of the electronic fan is insufficient and it is necessary to control the increase of the control voltage. Therefore, a first boost regulation instruction is output to trigger the voltage regulation operation. If the output voltage of the voltage converter DCDC, that is, the control voltage of the electronic fan, is greater than or equal to the high-voltage protection threshold C, it indicates that there is an overvoltage risk for the electronic fan and it is necessary to control the reduction of the control voltage. Therefore, a buck regulation instruction is output to trigger the voltage regulation operation. In this way, it can ensure that the system operates normally and improve the heat dissipation performance of the electronic fan.

[0053] In order to further ensure that the system operates normally and improve the heat dissipation performance of the electronic fan, in some embodiments of the present application, when it is detected that the continuous full-speed operation time of the electronic fan exceeds the preset time, a reduction regulation instruction is output to forcibly reduce the voltage to protect the voltage converter DCDC. Among them, the preset time is set according to needs or experience. For example, the preset time can be set to 5 minutes, 7 minutes, 8 minutes, etc., and no specific limitation is made here.

[0054] In order to smoothly regulate the control voltage of the electronic fan, in some embodiments of the present application, if the voltage regulation instruction is a first boost regulation instruction, the PID algorithm is applied to regulate the control voltage to gradually and smoothly increase the voltage from the current control voltage according to a preset gradient. If the voltage regulation instruction is a second boost regulation instruction, the PID algorithm is applied to regulate the control voltage to smoothly adjust from the current control voltage to the first voltage according to a preset gradient. If the voltage regulation instruction is a buck regulation instruction, the PID algorithm is applied to regulate the control voltage to gradually and smoothly decrease the voltage from the current control voltage according to a preset gradient.

[0055] Among them, the proportional coefficient, integral coefficient, and differential coefficient in the PID algorithm are determined according to the target voltage and the current control voltage. The calculation formulas are as follows: K p =α·|e(t)|, K i =β·∫e(t)dt, Among them, e(t) is the difference between the current voltage and the target voltage. Among them, α, β, and γ are dynamically adjusted coefficients to avoid voltage step jumps. The control voltage is regulated from the current control voltage to rise or fall to the target voltage according to the proportional coefficient, integral coefficient, and differential coefficient. The target speed of the electronic fan is determined according to the duty cycle request signal, and then the target voltage required is calculated inversely according to the target speed. Specifically, the control voltage corresponding to the target speed can be obtained by looking up the preset mapping relationship between the electronic fan speed and the control voltage to obtain the target voltage. Figure 3It is a mapping diagram of the rotational speed of the electric fan and the control voltage. After determining the target rotational speed of the electric fan, directly search this mapping diagram of the rotational speed of the electric fan and the control voltage, and the current and voltage corresponding to the rotational speed of the electric fan can be obtained. Use this voltage as the target voltage for subsequent control voltage adjustment and control. Of course, the target voltage can also be calculated according to the target rotational speed using a preset formula. Apply the PID algorithm to gradually and smoothly adjust the control voltage from the current control voltage to the target voltage according to a preset gradient, which is convenient for dynamically adjusting the control voltage, thus being beneficial to optimizing energy consumption while improving the heat dissipation performance.

[0056] In order to realize dynamic boost regulation of the control voltage, in some embodiments of the present application, when boosting the control voltage of the electric fan according to the first boost regulation instruction, apply the PID algorithm to adjust the control voltage to rise from the current level corresponding to the current control voltage to the previous level; adjust the control voltage to stay at the adjusted level for a preset time, and detect whether the heat dissipation performance is up to standard under the voltage of the adjusted level; if the heat dissipation performance is not up to standard, then apply the PID algorithm to adjust the control voltage to continue rising to the previous level until it is detected that the heat dissipation performance is up to standard under the voltage of the adjusted level.

[0057] In the embodiments of the present application, the control voltage range of the electric fan is divided into multiple levels, and the level where the current control voltage is located is determined. First, apply the PID algorithm to adjust the control voltage to rise from the current control voltage to the voltage corresponding to the adjacent previous level. After adjusting the control voltage to the adjacent previous level, stay for a preset time, evaluate the current heat dissipation performance according to the collected temperature parameter, duty cycle request signal, and the current control voltage, and then determine whether to continue adjusting the control voltage to the adjacent previous level according to the detected heat dissipation performance. If it is detected that the heat dissipation performance is up to standard, stop the current adjustment process. By performing gradient smoothing adjustment on the control voltage, electrical system impact caused by voltage mutation is avoided.

[0058] When boosting the control voltage of the electric fan according to the second boost regulation instruction, apply the PID algorithm to adjust the control voltage to rise from the current control voltage to the voltage corresponding to the adjacent previous level. After adjusting the control voltage to the adjacent previous level, stay for a preset time. Then continue to apply the PID algorithm to adjust the control voltage to rise to the voltage corresponding to the adjacent previous level until the control voltage is adjusted to the first voltage. During this period, no corresponding judgment is made according to the collected temperature parameter, duty cycle request signal, and the current control voltage. In this way, the threshold judgment process is skipped to ensure rapid response boost when the thermal management exceeds the limit and ensure the normal operation of the electric fan; by dynamically switching the 12V / 24V power supply voltage and combining with the PDI algorithm to achieve smooth voltage regulation, it is possible to significantly improve the heat dissipation performance in a limited engine room space while optimizing energy consumption; and by being compatible with the 12V / 24V platform, there is no need to transform the existing low-voltage electrical architecture, reducing the hardware cost.

[0059] In some embodiments of the present application, in order to achieve dynamic step-down regulation of the control voltage, the PID algorithm is applied to regulate the control voltage to drop from the current level corresponding to the current control voltage to the next level; the regulated control voltage stays at the adjusted level for a preset time, and it is detected whether the heat dissipation performance meets the standard at the adjusted level voltage; if the heat dissipation performance meets the standard, the PID algorithm is applied to regulate the control voltage to continue to drop to the next level until the control voltage is adjusted to the second voltage. Among them, first, the PID algorithm is applied to regulate the control voltage to drop from the current control voltage to the voltage corresponding to the adjacent next level. After the control voltage is adjusted to the adjacent next level, it stays for a preset time. Then, based on the collected temperature parameters, duty cycle request signal, and the current control voltage, the current heat dissipation performance is evaluated, and then it is determined whether to continue to regulate the control voltage to the adjacent next level according to the detected heat dissipation performance. If the control voltage has been adjusted to the second voltage, the current adjustment process is stopped. By performing gradient smoothing adjustment on the control voltage, voltage mutations that cause electrical system shocks are avoided, and at the same time, the 12V / 24V power supply voltage can be dynamically switched according to real-time analysis of heat dissipation requirements. By being compatible with the 12V / 24V platform, there is no need to modify the existing low-voltage electrical architecture, reducing the hardware cost.

[0060] In an exemplary embodiment of this specification, a schematic diagram of a method for regulating the voltage of an electric fan is provided. As Figure 4 shown, the method for regulating the voltage of the electric fan includes:

[0061] Step 100: Start.

[0062] Step 101: Initialize parameters.

[0063] After the vehicle is woken up, the vehicle control unit (VCU) loads the thermal management strategy and initializes the duty cycle threshold A of the electric fan. The duty cycle threshold A is the maximum demand value for ensuring heat dissipation performance in the reference voltage mode of 12V. The duty cycle threshold A can be set according to needs or experience. For example, the duty cycle threshold A can be set to 2500 rpm, or 2400 rpm, etc., and specific limitations are not made here.

[0064] At the same time, the low-voltage protection threshold B and high-voltage protection threshold C of the voltage converter DCDC are also set to determine voltage abnormalities. The low-voltage protection threshold B and high-voltage protection threshold C can also be set according to needs or experience. For example, the low-voltage protection threshold B can be set to 9V, 11V, etc., and the high-voltage protection threshold C can be set to 25V, 26V, etc.

[0065] In addition, reference thresholds for the engine water temperature, electric drive temperature, and battery temperature are also set respectively. Each reference threshold can be set according to needs or experience. For example, they are set to 115 °C, 65 °C, and 45 °C respectively, and specific limitations are not made here.

[0066] Step 102: Collect data in real time.

[0067] Periodically collect the engine water temperature, electric drive temperature, and battery temperature, and collect the duty cycle request signal and the current control voltage of the electric fan in real time. In the embodiments of the present application, temperature sensors can be used to collect the engine water temperature, electric drive temperature, and battery temperature. The temperature sensor can be any existing temperature sensor. For example, it can be a contact temperature sensor such as a thermocouple or a thermistor, or a non-contact temperature sensor such as an infrared temperature sensor, or an integrated temperature sensor. The current control voltage can be obtained through a voltage sensor.

[0068] Step 103: Determine whether the duty cycle is greater than the duty cycle threshold A. If so, execute Step 104; otherwise, return to execute Step 102.

[0069] Determine the rotational speed duty cycle of the electric fan according to the duty cycle request signal, and then determine whether the rotational speed duty cycle of the electric fan is greater than the duty cycle threshold A. If the rotational speed duty cycle of the electric fan is greater than the duty cycle threshold A, it indicates that the operation of the electric fan will generate a large amount of heat and the heat dissipation demand exceeds the limit.

[0070] Step 104: Determine whether the control voltage exceeds the limit. If so, execute Step 105; otherwise, execute Step 106.

[0071] In Step 104, determine whether the control voltage is less than the low-voltage protection threshold B and whether the control voltage is greater than the high-voltage protection threshold C. If the control voltage is less than the low-voltage protection threshold B or the control voltage is greater than the high-voltage protection threshold C, it is determined that the control voltage exceeds the limit, that is, the control voltage exceeds the safe operating range. If the control voltage is greater than or equal to the low-voltage protection threshold B and less than or equal to the high-voltage protection threshold C, it is determined that the control voltage is within the safe voltage range. The safe voltage range in the embodiments of the present application is preferably 12V - 24V, that is, the control voltage of the electric fan can be dynamically adjusted within the range of 12V - 24V according to the heat dissipation performance.

[0072] Step 105: Force voltage regulation. Then return to execute Step 102.

[0073] Among them, if the control voltage is less than the low-voltage protection threshold B, it indicates that the electric fan is operating with under-voltage, then force boost control and alarm. If the control voltage is greater than the high-voltage protection threshold C, immediately cut off the output and switch to the backup power supply.

[0074] Step 106: Calculate the target voltage.

[0075] Determine the target speed of the electric fan according to the duty cycle request signal, and then inversely determine the required target voltage according to the target speed. The control voltage corresponding to the target speed can be obtained by looking up the preset mapping relationship between the electric fan speed and the control voltage, so as to obtain the target voltage. Of course, the target voltage can also be calculated according to the target speed using a preset formula.

[0076] Step 107: PID gain calculation.

[0077] The PID gain includes a proportional coefficient, an integral coefficient, and a differential coefficient. In the embodiments of the present application, the proportional coefficient, the integral coefficient, and the differential coefficient in the PID algorithm can be determined according to the target voltage and the current control voltage. The calculation formulas are as follows: K p = α·|e(t)|, K i = β·∫e(t)dt, where e(t) is the difference between the current voltage and the target voltage, and α, β, and γ are dynamically adjusted coefficients to avoid step jumps in the control voltage.

[0078] Step 108: Stepwise gradient output of 12V - 24V.

[0079] Apply the PID algorithm to adjust stepwise and gradually within the voltage range of 12V - 24V. Optionally, if the heat dissipation performance does not meet the standard, apply the PID algorithm to adjust the control voltage from the current level corresponding to the current control voltage to the adjacent higher level; keep the control voltage at the adjusted level for a preset time, and detect whether the heat dissipation performance meets the standard at the voltage of the adjusted level; if the heat dissipation performance does not meet the standard, then apply the PID algorithm to adjust the control voltage to the adjacent higher level until the heat dissipation performance meets the standard.

[0080] During the boost process, the voltage is gradually increased in a predetermined gradient (such as 12V → 16V → 20V → 24V), and the preset time for staying at each gradient level is adjustable (for example, 200ms) to avoid electrical system impact caused by voltage mutation. In the embodiments of the present application, the setting of the preset gradient can be freely set, such as 12V → 16V → 20V → 24V, and of course, other settings are also possible. Among them, the number of levels can also be freely set, and the voltage gradient between adjacent levels can be the same or different. The embodiments of the present application can serve both 12V power supply platforms and 24V power supply platforms. When the heat dissipation requirement is not high, control the electric fan to work in the 12V reference voltage mode, which can minimize energy consumption to the greatest extent. When the heat dissipation requirement is very high, the electric fan can be controlled to work in the high-voltage drive mode to maximize the speed of the electric fan, for example, increase the speed of the electric fan to the maximum value, such as 3000rpm, so as to maximize the heat dissipation performance of the electric fan.

[0081] If a reduced heat dissipation requirement is detected, the PID algorithm is applied to adjust the control voltage from the current level corresponding to the current control voltage to the next adjacent level; the adjusted control voltage stays at the adjusted level for a preset time, and the heat dissipation performance at the adjusted level voltage is detected. If the heat dissipation performance meets the standard and the control voltage is greater than the second voltage, the PID algorithm is continuously applied to adjust the control voltage to the next adjacent level until the control voltage equals the second voltage. That is, if the heat dissipation requirement decreases and the control voltage > 12V, the control voltage is adjusted downward in a gradient until the reference voltage mode of 12V is returned.

[0082] By analyzing the heat dissipation requirement in real time, the control voltage of 12V / 24V is dynamically switched, and smooth voltage regulation is achieved by combining the IPD algorithm. In this way, the heat dissipation performance is significantly improved in the limited engine room space, while the energy consumption is optimized, the existing low-voltage electrical platform is compatible, and it is applicable to hybrid and pure electric vehicle models.

[0083] In addition, when the fan runs at full speed continuously for more than the preset time, the voltage is forced to drop to protect the voltage converter DCDC. The preset time can be freely set as needed, such as it can be set to 5 minutes, 10 minutes, etc.

[0084] Step 109: Determine whether the control voltage exceeds the limit. If so, jump to execute Step 105; otherwise, execute Step 110.

[0085] The method for determining whether the control voltage exceeds the limit is the same as that in Step 104, that is, to determine whether the control voltage is less than the low-voltage protection threshold B and whether the control voltage is greater than the high-voltage protection threshold C.

[0086] Step 110: End.

[0087] The voltage regulation method of the electric fan in the embodiment of the present application analyzes the heat dissipation requirement in real time through the vehicle control unit VCU, dynamically switches the 12V / 24V control voltage, and realizes smooth voltage regulation by combining the PDI algorithm. This voltage regulation method significantly improves the heat dissipation performance in the limited engine room space, while optimizing the energy consumption, being compatible with the existing low-voltage electrical platform, and applicable to hybrid and pure electric vehicle models. The beneficial effects generated include:

[0088] 1. Improvement in heat dissipation performance: Driven by 24V high voltage, the maximum speed of the electric fan increases by about 40%, and the air volume increases significantly, meeting the high-load heat dissipation requirements of new energy vehicle models

[0089] 2. Optimization of energy consumption: Only boost the voltage when necessary, and the energy consumption is reduced by more than 30% compared with the fixed 24V system;

[0090] 3. Compatibility and cost advantages: Compatible with 12V / 24V platforms, there is no need to transform the existing low-voltage electrical architecture, reducing the hardware cost.

[0091] The following is an example to illustrate the stepped adjustment of the control voltage of the electric fan in this application. As Figure 5 shown, it includes:

[0092] Stage T0 - T1: Initial state

[0093] The DCDC outputs a 12V voltage, and the electric fan operates at a conventional speed (e.g., 2000 rpm).

[0094] Marking point: At time T0, the water temperature / electric drive temperature is not exceeded, and the duty cycle request is lower than threshold A.

[0095] Time T1: Cooling demand is triggered

[0096] At time T1, the vehicle control unit VCU detects that the duty cycle request exceeds the duty cycle threshold A (e.g., the required speed ≥ 2400 rpm), or the key temperature exceeds the safety value (such as the electric drive temperature > 65°C).

[0097] At this time, a boost command is triggered, and the voltage converter DCDC starts to increase the control voltage step by step.

[0098] Stage T1 - T4: Stepped boost execution

[0099] Step 1 (T1 - T2): The control voltage rises from 12V to 16V, and stays for a preset time Δt = 200 ms. During this period, the rotational speed response of the electric fan and the temperature change are monitored.

[0100] Step 2 (T2 - T3): The control voltage rises from 16V to 20V, and stays for a preset time Δt = 200 ms. If the cooling performance still does not meet the standard, continue to boost the voltage.

[0101] Step 3 (T3 - T4): The control voltage rises from 20V to 24V, enters the high - voltage drive mode, and the rotational speed of the electric fan increases to the maximum value (e.g., 3000 rpm).

[0102] Stage T4 - T5: High - voltage maintenance and verification

[0103] After time T4, maintain the 24V output until it is detected that the cooling index returns to the safe range (such as the water temperature drops below 115°C).

[0104] Stage T5 - T8: Step - down process (24V → 12V)

[0105] Cooling demand alleviation: At time T5, the vehicle control unit VCU detects that the duty cycle request is lower than the duty cycle threshold A, and the temperature remains stable.

[0106] At this time, a step - down command is triggered, and the voltage converter DCDC reduces the control voltage step by step.

[0107] Stepped step - down execution:

[0108] Step 1 (T5 - T6): The control voltage drops from 24V to 20V, and the preset dwell time Δt = 200ms to ensure that the heat dissipation performance does not rebound.

[0109] Step 2 (T6 - T7): The control voltage drops from 20V to 16V, and the preset dwell time Δt = 200ms to synchronously monitor the adaptability of the electronic fan speed.

[0110] Step 3 (T7 - T8): The voltage drops from 16V to 12V, and returns to the reference voltage mode.

[0111] After stage T8: Low - voltage maintenance and protection

[0112] After T8, the voltage converter DCDC maintains a 12V output. If the heat dissipation requirement appears again, the boosting process is repeated.

[0113] In the embodiment of the present application, when the control voltage changes gradually, the control voltage change between steps is a ramp - type gradual change (not an instantaneous jump), and the slope is controlled by the PID algorithm. For example, it rises / falls by 0.2V per 1ms to avoid impacting the low - voltage electrical system.

[0114] In the embodiment of the present application, a voltage protection range is also marked: the undervoltage protection line is when the control voltage is equal to the low - voltage protection threshold B, and the overvoltage protection line is when the control voltage is equal to the high - voltage protection threshold C. That is, if the control voltage is less than the low - voltage protection threshold B or greater than the high - voltage protection threshold C, it is determined that there is an abnormal operating condition. When dealing with an abnormal operating condition, if the control voltage is lower than the low - voltage protection threshold B, forced boosting and alarm are performed. If the control voltage exceeds the high - voltage protection threshold C, the output is immediately cut off and switched to the backup power supply. Among them, the low - voltage protection threshold B and the high - voltage protection threshold C can be set according to needs or experience. For example, B = 9V, C = 25V, and specific limitations are not made here.

[0115] In an exemplary embodiment of this specification, a voltage regulation device for an electronic fan is also provided, which is applied to a vehicle controller. As Figure 6 shown, the voltage regulation device 600 of the electronic fan includes:

[0116] A data acquisition module 601, configured to periodically acquire temperature control parameters, and in real - time acquire the duty - cycle request signal of the electronic fan and the current control voltage for controlling the electronic fan;

[0117] An instruction control module 602, configured to output a voltage regulation instruction according to the duty - cycle request signal, the periodically acquired temperature control parameters, and the current control voltage;

[0118] A voltage regulation module 603 is configured to dynamically and smoothly regulate the control voltage of the electric fan according to the voltage regulation instruction.

[0119] In a specific embodiment, the temperature parameter includes the engine water temperature, the electric drive temperature, or the battery temperature; the instruction control module 602 is further configured to: if the duty ratio request signal is greater than or equal to the duty ratio threshold, output a first boost regulation instruction for instructing to dynamically increase the control voltage; if the engine water temperature, the electric drive temperature, or the battery temperature is greater than or equal to the corresponding reference threshold, and the rotation speed of the electric fan under the current control voltage cannot meet the heat dissipation requirement, output a second boost regulation instruction for instructing to regulate the control voltage to a first voltage.

[0120] In some embodiments, the instruction control module 602 is further configured to: determine the heat dissipation requirement according to the periodically collected electric drive temperature and battery temperature; determine the water temperature drop rate according to the periodically collected engine water temperature; and output a voltage regulation instruction according to the water temperature drop rate and the heat dissipation requirement.

[0121] In some embodiments, the instruction control module 602 is further configured to determine whether the heat dissipation performance meets the standard according to the water temperature drop rate and the heat dissipation requirement; if the heat dissipation performance meets the standard and the current control voltage is greater than or equal to a second voltage, output a step-down regulation instruction; if the heat dissipation performance does not meet the standard and the current control voltage is less than or equal to the first voltage, output the first boost regulation instruction.

[0122] In some embodiments, the voltage regulation module 603 is configured to: if the voltage regulation instruction is the first boost regulation instruction, apply a PID algorithm to regulate the control voltage to gradually and smoothly increase the voltage from the current control voltage according to a preset gradient; if the voltage regulation instruction is the second boost regulation instruction, apply a PID algorithm to regulate the control voltage to smoothly regulate to the first voltage from the current control voltage according to a preset gradient; if the voltage regulation instruction is the step-down regulation instruction, apply a PID algorithm to regulate the control voltage to gradually and smoothly decrease the voltage from the current control voltage according to a preset gradient.

[0123] In some embodiments, the voltage regulation module 603 is further configured to: apply a PID algorithm to regulate the control voltage to rise from the current level corresponding to the current control voltage to the previous level; keep the control voltage at the adjusted level for a preset time, and detect whether the heat dissipation performance meets the standard at the voltage of the adjusted level; if the heat dissipation performance does not meet the standard, apply a PID algorithm to regulate the control voltage to continue rising to the previous level until it is detected that the heat dissipation performance meets the standard at the voltage of the adjusted level.

[0124] In some embodiments, the voltage regulation module 603 is further configured to: apply a PID algorithm to regulate the control voltage to decrease from the current level corresponding to the current control voltage to the next level; regulate the control voltage to stay at the adjusted level for a preset time, and detect whether the heat dissipation performance meets the standard under the adjusted level voltage; if the heat dissipation meets the standard, apply the PID algorithm to regulate the control voltage to continue to decrease to the next level until the control voltage is adjusted to the second voltage.

[0125] For the specific limitations of the voltage regulation device of the electronic fan, reference can be made to the limitations of the voltage regulation method of the electronic fan in the foregoing text, which will not be elaborated herein. Each module in the above-mentioned voltage regulation device of the electronic fan can be implemented in whole or in part by software, hardware, and their combination. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above-mentioned modules.

[0126] Regarding the device in the above embodiments, the specific manner in which each unit performs operations has been described in detail in the embodiments of the voltage regulation method of the electronic fan, and will not be elaborated herein.

[0127] Figure 7 It is a schematic structural diagram of a vehicle provided by an embodiment of the present application.

[0128] Exemplarily, as Figure 7 shown, the vehicle includes: a memory 701 and a processor 702, wherein, an executable program code 7011 is stored in the memory 701, and the processor 702 is configured to call and execute the executable program code 7011 to execute the voltage regulation method of the electronic fan.

[0129] In this embodiment, the vehicle can be divided into functional modules according to the above method embodiment. For example, it can correspond to each functional module, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is illustrative, only a logical function division, and there can be other division methods in actual implementation.

[0130] In the case of dividing each functional module according to each function, the vehicle may include: a data acquisition module, an instruction control module, a voltage regulation module, etc.

[0131] It should be noted that all relevant contents of each step involved in the above method embodiment can be cited in the function description of the corresponding functional module, which will not be elaborated herein.

[0132] The vehicle provided in this embodiment is used to execute the above voltage regulation method of an electronic fan, so the same effect as the above implementation method can be achieved.

[0133] In the case of adopting an integrated unit, the vehicle may include a processing module and a storage module. Among them, the processing module can be used to control and manage the actions of the vehicle. The storage module can be used to support the vehicle to execute mutual program codes and data, etc.

[0134] Among them, the processing module can be a processor or a controller, which can implement or execute various exemplary logic blocks, modules and circuits described in combination with the disclosure of this application. The processor can also be a combination that realizes computing functions, such as including a combination of one or more microprocessors, a combination of digital signal processing (DSP) and a microprocessor, etc. The storage module can be a memory.

[0135] This embodiment also provides a computer-readable storage medium. Computer program codes are stored in the computer-readable storage medium (including but not limited to disk memories, CD-ROMs, optical memories, etc.). When the computer program codes run on a computer, the computer is enabled to execute the above related method steps to implement the voltage regulation method of an electronic fan provided in the above embodiment. Among them, the computer-readable storage medium can include but not limited to any type of disk, including floppy disks, optical discs, digital versatile discs (DVDs), compact disc read-only memories (CD-ROMs), microdrives, magneto-optical discs, read-only memories (ROMs), random access memories (RAMs), erasable programmable read-only memories (EPROMs), electrically erasable programmable read-only memories (EEPROMs), dynamic random access memories (DRAMs), video random access memories (VRAM), flash memory devices, magnetic cards or optical cards, nanosystems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0136] This embodiment also provides a computer program product. When the computer program product runs on a computer, it causes the computer to execute the above-related steps to implement a voltage regulation method for an electronic fan provided in the above embodiment.

[0137] Among them, for the beneficial effects of the above embodiment, reference can be made to the beneficial effects in the corresponding method provided above, which will not be elaborated here.

[0138] Through the description of the above embodiments, those skilled in the art can understand that for the convenience and brevity of description, only the above division of each functional module is used as an example. In actual applications, the above functions can be allocated to different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.

[0139] In the embodiments provided in the present application, it should be understood that the disclosed device and method can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection can be through some interfaces. The indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0140] In the description of the present disclosure, it should be understood that if terms such as "upper", "lower", "front", "rear", "left" and "right" are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated position or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present disclosure.

[0141] It should be noted that in the embodiments of the present application, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to this process, method, commodity or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0142] The above are only embodiments of the present disclosure and are not intended to limit the present disclosure. For those skilled in the art, various modifications and variations can be made to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included within the scope of the claims of the present disclosure.

Claims

1. A voltage regulation method for an electric fan, characterized in that, Applied to a vehicle controller, the method includes: Periodically collect temperature control parameters, and in real time collect the duty cycle request signal of the electric fan and the current control voltage for controlling the electric fan; Output a voltage regulation instruction according to the duty cycle request signal, the periodically collected temperature control parameters, and the current control voltage; Dynamically and smoothly regulate the control voltage of the electric fan according to the voltage regulation instruction.

2. The method according to claim 1, wherein The temperature parameters include engine coolant temperature, electric drive temperature, or battery temperature; The outputting a voltage regulation instruction according to the duty cycle request signal, the periodically collected temperature control parameters, and the current control voltage includes: If the duty cycle request signal is greater than or equal to the duty cycle threshold, output a first boost regulation instruction, where the first boost regulation instruction is used to indicate dynamically increasing the control voltage; If the engine coolant temperature, the electric drive temperature, and / or the battery temperature is greater than or equal to the corresponding reference threshold, and the rotation speed of the electric fan under the current control voltage cannot meet the heat dissipation requirement, output a second boost regulation instruction, where the second boost regulation instruction is used to indicate regulating the control voltage to a first voltage.

3. The method according to claim 2, wherein The outputting a voltage regulation instruction according to the duty cycle request signal, the periodically collected temperature control parameters, and the current control voltage further includes: Determine the heat dissipation requirement according to the periodically collected electric drive temperature, battery temperature, and engine coolant temperature; Determine the water temperature decrease rate according to the periodically collected engine coolant temperature; Output a voltage regulation instruction according to the water temperature decrease rate and the heat dissipation requirement.

4. The method according to claim 3, wherein The outputting a voltage regulation instruction according to the water temperature decrease rate and the heat dissipation requirement includes: Determine whether the heat dissipation performance meets the standard according to the water temperature decrease rate and the heat dissipation requirement; If the heat dissipation performance meets the standard, and the current control voltage is greater than or equal to a second voltage, output a step-down regulation instruction; If the heat dissipation performance does not meet the standard, and the current control voltage is less than or equal to the first voltage, output the first boost regulation instruction.

5. The method according to claim 3, characterized in that The outputting a voltage regulation instruction according to the water temperature decrease rate and the heat dissipation requirement includes: If the heat dissipation requirement decreases, and the current control voltage is greater than the second voltage, output a step-down regulation instruction.

6. The method according to claim 1, characterized in that, The dynamically and smoothly regulating the control voltage of the electric fan according to the voltage regulation instruction includes: If the voltage regulation instruction is the first boost regulation instruction, apply the PID algorithm to regulate the control voltage to gradually and smoothly increase the voltage from the current control voltage according to a preset gradient; If the voltage regulation instruction is the second boost regulation instruction, apply the PID algorithm to regulate the control voltage to smoothly regulate from the current control voltage to the first voltage according to a preset gradient; If the voltage regulation instruction is the step-down regulation instruction, apply the PID algorithm to regulate the control voltage to gradually and smoothly decrease the voltage from the current control voltage according to a preset gradient.

7. The method according to claim 6, wherein The applying the PID algorithm to regulate the control voltage to gradually and smoothly increase the voltage from the current control voltage according to a preset gradient includes: Apply the PID algorithm to regulate the control voltage to rise from the current level corresponding to the current control voltage to the previous level; Adjust the control voltage to stay at the adjusted level for a preset time, and detect whether the heat dissipation performance at the adjusted level voltage meets the standard; If the heat dissipation performance does not meet the standard, apply the PID algorithm to adjust the control voltage to continue rising to the previous level until the heat dissipation performance at the adjusted level voltage is detected to meet the standard.

8. The method according to claim 1, characterized in that, The applying the PID algorithm to adjust the control voltage to gradually and smoothly decrease the voltage from the current control voltage according to a preset gradient includes: Apply the PID algorithm to adjust the control voltage to decrease from the current level corresponding to the current control voltage to the next level; Adjust the control voltage to stay at the adjusted level for a preset time, and detect whether the heat dissipation performance at the adjusted level voltage meets the standard; If the heat dissipation performance meets the standard, apply the PID algorithm to adjust the control voltage to continue decreasing to the next level until the control voltage is adjusted to the second voltage.

9. A voltage regulating device for an electric fan, characterized in that, Applied to a vehicle controller, the device includes: A data acquisition module, configured to periodically acquire temperature control parameters, and in real time acquire the duty cycle request signal of the electronic fan and the current control voltage for controlling the electronic fan; An instruction control module, configured to output a voltage adjustment instruction according to the duty cycle request signal, the periodically acquired temperature control parameters, and the current control voltage; A voltage adjustment module, configured to dynamically and smoothly adjust the control voltage of the electronic fan according to the voltage adjustment instruction.

10. A vehicle, characterized in that, The vehicle includes: A memory, configured to store executable program code; A processor, configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 8.

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