An infinitely variable speed control method for an automotive fan

Abstract

The invention provides a stepless speed regulation method for an automobile fan, relates to the technical field of automobile fans, and comprises the following steps: step one: using a collection sensor provided by the engine to collect real-time operating parameters of the engine; step two: building an infrared detection module in an engine compartment to obtain real-time temperature data of the environment around the engine; step three: building a target detection model based on the data collected by the infrared detection module; the invention uses the collection sensor provided by the engine to collect the real-time operating parameters of the engine, uses the infrared detection module to obtain the real-time temperature data of the environment around the engine, performs linear weighted fusion correction on two groups of real-time temperature value data, obtains a fused and corrected temperature value, takes into account the influence of the temperature of the engine itself and the ambient temperature, so as to be closer to the accurate temperature value data of the engine, reduce errors, facilitate adaptive stepless control of the rotation speed of the fan, and adapt to the actual needs of the engine.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive fans, and particularly to a stepless speed regulation method for an automotive fan. Background Art

[0002] With the continuous development of technology, the diesel engine cooling system has become more energy-efficient and intelligent. An advanced engine thermal management system can maximize the engine's operation within the optimal working temperature range under different operating conditions, while improving the thermal efficiency of internal combustion in the engine to achieve fuel-saving purposes. The evolution of the engine cooling fan can be summarized into the following three stages: 1. Simple and crude mechanically direct-connected fans, 2. Mechanically adjustable silicone oil clutch fans, 3. Advanced and controllable electronically controlled silicone oil clutch fans and electromagnetic clutch fans;

[0003] Mechanically direct-connected fans are a type of fan commonly used in early diesel engines and can still be seen in some high-cost performance models. They use the crankshaft to drive the belt to directly drive the fan, and the engine speed is equal to the fan speed. This type of fan has a simple structure, low manufacturing cost, and good reliability. As long as the belt does not break, the fan generally will not be damaged. However, the disadvantages of mechanically direct-connected fans are also obvious. For example, in winter when the temperature is low, since there is a large amount of cold oncoming wind blowing through the radiator during vehicle driving, the heat exchange effect is obvious, and the engine coolant often remains at a relatively low temperature. At this time, the continuous operation of the fan becomes meaningless. It not only consumes engine power but also accelerates the heat dissipation effect, making it difficult for the coolant temperature to rise to the ideal temperature required for the engine to operate efficiently, resulting in deteriorated fuel consumption and increased wear;

[0004] Silicone oil clutch fans use silicone oil as the transmission medium and transmit torque through highly viscous silicone oil during operation. Mechanically controlled silicone oil clutch fans control whether the silicone oil enters the working chamber and connects the driving wheel and the driven wheel to make the fan rotate by the deformation of the temperature-sensitive metal strip installed outside. The space between the front cover of the silicone oil fan clutch and the driven plate is the oil storage chamber, and the highly viscous silicone oil is stored here. A spiral metal temperature sensor is installed on the front cover. When the engine coolant temperature rises, the temperature of the wind blowing through the radiator rises, causing the metal temperature sensor to deform. The temperature-sensitive metal strip is connected to the oil storage chamber valve. After deformation, the oil storage chamber valve is opened, and the silicone oil flows into the cavity between the driving plate and the driven plate. At this time, the highly viscous silicone oil will transmit the torque from the driving plate to the driven plate and drive the fan to start rotating at high speed to increase the heat dissipation of the cooler. When the coolant temperature decreases, the temperature-sensitive metal strip returns to its original shape due to elasticity and closes the oil storage chamber valve, and the silicone oil cannot continue to flow out. The silicone oil that has already flowed out is thrown to the edge by the centrifugal force during high-speed rotation and then flows back to the oil storage chamber through small holes;

[0005] The control of the electromagnetic clutch fan is that the magnetic force generated by the electromagnetic coil directly attracts the friction plate to achieve power transmission and interruption. Usually, the electromagnetic clutch fan is equipped with two sets of coils of different sizes, and the ECU can control the current on and off to generate two kinds of magnetic forces to attract the friction plate, so that the fan speed can be adjusted in two levels;

[0006] Combining the above-mentioned fans, the electronically controlled silicone oil clutch fan has the most obvious advantage, which can realize stepless adjustment of the fan speed, thereby achieving precise control of the heat dissipation effect. However, in the electronically controlled silicone oil clutch fan, the ambient temperature cannot be accurately obtained by simply relying on the temperature-sensitive metal strip, and there is a certain error in the temperature correction, which makes it difficult for the fan speed adjustment to adapt to the actual needs of the engine, and the mode is single. No matter in summer or winter, there is no comprehensive environmental factor, and the coolant always maintains a stepless speed regulation mode, which increases the burden of the control system. Therefore, the present invention proposes a stepless speed regulation method for an automobile fan to solve the problems existing in the prior art. Summary of the invention

[0007] In view of the above problems, the present invention proposes a stepless speed regulation method for an automobile fan. The stepless speed regulation method for an automobile fan takes into account the influence of the engine's own temperature and the ambient temperature, so that it is closer to the accurate temperature value data of the engine, the data correction is accurate, and the error is reduced. According to this accurate value, the speed of the fan can be adaptively and steplessly controlled to meet the actual needs of the engine.

[0008] To achieve the purpose of the present invention, the present invention is implemented by the following technical scheme: a stepless speed regulation method for an automobile fan, comprising the following steps:

[0009] Step 1: Use the engine's own acquisition sensor to collect the engine's real-time operating parameters;

[0010] Step 2: Install an infrared detection module in the engine compartment to obtain real-time temperature data of the environment around the engine;

[0011] Step 3: Build a target detection model based on the data collected by the infrared detection module;

[0012] Step 4: Input the temperature value collected by the engine's own acquisition sensor into the target detection model, and perform linear weighted fusion with the temperature value collected by the infrared detection module to obtain a fused and corrected temperature value;

[0013] Step 5: A speed regulation mode is built into the target detection model, and the speed regulation mode of the fan is determined according to the fused and corrected temperature value, so as to perform stepless speed regulation on the fan.

[0014] A further improvement is that in step 1, the inlet and outlet temperatures of the engine's cooling water are collected using the engine's own collection sensor, and the difference is calculated to determine the real-time temperature data of the engine.

[0015] A further improvement is that in step 2, the real-time temperature data of the engine is obtained including a real-time infrared thermal imaging image of the environment around the engine and the temperature value of the corresponding area in the image.

[0016] A further improvement is that in step 3, building a target detection model includes the following steps:

[0017] In the infrared images collected by the infrared detection module, the residual layer of the YOLOv5 network is replaced with a dense convolutional block;

[0018] Construct a feature pyramid with three convolutional layers of different scales and fuse the feature pyramid with a deep dense network;

[0019] The Softmax function is used to classify the fused features to form a target detection model that includes engine and regional temperature features.

[0020] A further improvement is that: the step 4 includes the following steps:

[0021] The temperature value collected by the engine's own collection sensor and the temperature value collected by the current infrared detection module are linearly weighted to obtain T1;

[0022] The temperature value collected by the engine's own collection sensor is linearly weighted fused with the linearly weighted fusion temperature value at the previous moment to obtain T2;

[0023] The temperature value collected by the current infrared detection module is linearly weighted fused with the linear weighted fusion temperature value at the previous moment to obtain T3;

[0024] Get the fusion temperature value (T1, T2, T3) * (Y1, Y2, Y3) A The fusion correction temperature value RA is obtained, where Y1, Y2, and Y3 are algorithm fusion weight values, and A represents the specified time.

[0025] A further improvement is that the step 5 includes the following steps:

[0026] A threshold is set according to the fusion correction temperature value, and when the fusion correction temperature value is lower than the threshold value I, the speed regulation mode is set to the winter mode;

[0027] When the fusion correction temperature value is higher than the threshold value I, the speed regulation mode is set to the summer mode;

[0028] Build a simulation model in the target detection model to simulate the position and blowing range of the fan, and simulate the cooling amplitude of the engine and the regional temperature at different fan speeds;

[0029] Based on this, construct a control logic, which is built into the fan controller to perform stepless adjustment on the fan.

[0030] A further improvement lies in that in step five, the winter mode includes the following steps:

[0031] When the fused corrected temperature value is lower than threshold I and higher than Y value, the fan controller controls the fan to start;

[0032] The fan cools the engine at a constant speed suitable for being lower than threshold I until the fused corrected temperature is lower than Y value, and then the fan stops;

[0033] When the fused corrected temperature value is lower than threshold Y value, the fan controller controls the fan to stop running.

[0034] A further improvement lies in that in step five, the summer mode includes the following steps:

[0035] When the fused corrected temperature value is higher than threshold I, the fan controller controls the fan to start;

[0036] Calculate the value by which the current fused corrected temperature is higher than threshold I, and adjust the fan speed according to the values of the cooling of the engine and the regional temperature at different fan speeds in the control logic;

[0037] Steplessly change the fan speed according to the difference between the real-time fused corrected temperature and threshold I to adapt to the cooling requirements at different temperatures.

[0038] A further improvement lies in that in step five, the stepless adjustment of the fan by the fan controller includes the following steps:

[0039] After the power is turned on, the capacitor in the speed control circuit is charged. When the voltage on the capacitor exceeds the blocking voltage of the trigger diode, the trigger diode conducts, causing the bidirectional thyristor to also trigger and conduct, and the fan gets voltage and starts to run;

[0040] The fan controller changes the potentiometer in the speed control circuit to change its resistance value;

[0041] Based on this, change the trigger angle of the bidirectional thyristor, so that the working voltage across the motor winding also changes accordingly;

[0042] Thus, the purpose of stepless voltage regulation, speed regulation and air volume adjustment is achieved.

[0043] The beneficial effects of the present invention are:

[0044] 1. The present invention uses the acquisition sensor provided by the engine to collect the real-time operating parameters of the engine, uses the infrared detection module to obtain the real-time temperature data of the environment around the engine, and linearly weighted fuses the two sets of real-time temperature value data to obtain a fused and corrected temperature value. The weighted correction takes into account the influence of the engine's own temperature and the ambient temperature. This is closer to the accurate temperature value data of the engine, the data correction is accurate, and the error is reduced. According to this accurate value, the speed of the fan can be adaptively and steplessly controlled to meet the actual needs of the engine.

[0045] 2. The present invention sets the winter mode and the summer mode according to the fusion correction temperature value. In summer, the difference between the current fusion correction temperature and the threshold value I is calculated, and the fan speed is adjusted steplessly according to the control logic and the real-time difference to adapt to the cooling needs at different temperatures more accurately. In winter, an additional Y value is set to control the fan to cool the engine at a constant speed. When the speed is lower than the Y value, the fan stops, reducing unnecessary stepless speed regulation, and having a start-stop function, reducing the control burden of the controller and saving energy.

[0046] 3. The present invention changes the resistance value of the potentiometer in the speed control circuit, thereby changing the trigger angle of the bidirectional thyristor, so that the working voltage at both ends of the motor winding also changes accordingly; thereby achieving the purpose of stepless voltage and speed regulation and air volume adjustment, and the electronically controlled stepless speed change is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a flow chart of the present invention;

[0048] Figure 2 is a winter mode flow chart of the present invention;

[0049] Figure 3 It is the summer mode flow chart of the present invention. DETAILED DESCRIPTION

[0050] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0051] Embodiment 1

[0052] according to Figure 1 , 2 As shown, this embodiment proposes a stepless speed regulation method for a car fan, comprising the following steps:

[0053] The real-time operating parameters of the engine are collected by using the collection sensor provided by the engine; specifically, the inlet and outlet temperatures of the cooling water of the engine are collected by using the collection sensor provided by the engine, and the difference is calculated to determine the real-time temperature data of the engine;

[0054] An infrared detection module is built into the engine compartment to obtain real-time temperature data of the environment around the engine, including real-time infrared thermal imaging images of the environment around the engine and temperature values ​​of corresponding areas in the image;

[0055] Based on the data collected by the infrared detection module, a target detection model is constructed. The following steps are performed: replace the residual layer of the YOLOv5 network with a dense convolution block in the infrared image collected by the infrared detection module; construct a feature pyramid containing three convolution layers of different scales, and fuse the feature pyramid with the deep dense network; use the Softmax function to classify the fused features to form a target detection model that includes engine and regional temperature features; use this model as the benchmark for subsequent fusion data to make the calculated data more accurate;

[0056] The temperature value collected by the engine's own acquisition sensor is input into the target detection model, and linearly weighted fused with the temperature value collected by the infrared detection module to obtain the fused and corrected temperature value, including the following steps:

[0057] Linearly weighted fusion of the temperature value collected by the engine's own acquisition sensor and the temperature value collected by the current infrared detection module to obtain T1; linearly weighted fusion of the temperature value collected by the engine's own acquisition sensor and the linear weighted fusion temperature value of the previous moment to obtain T2; linearly weighted fusion of the temperature value collected by the current infrared detection module and the linear weighted fusion temperature value of the previous moment to obtain T3; the obtained fusion temperature value (T1, T2, T3) * (Y1, Y2, Y3) A The fused correction temperature value RA is obtained, where Y1, Y2, and Y3 are algorithm fusion weight values, and A represents the specified time. The present invention uses the acquisition sensor provided by the engine to collect the real-time operating parameters of the engine, and uses the infrared detection module to obtain the real-time temperature data of the environment around the engine. The two sets of real-time temperature value data are linearly weighted fused to obtain the fused correction temperature value, and the weighted correction takes into account the influence of the engine's own temperature and the ambient temperature, so that it is closer to the accurate temperature value data of the engine, the data correction is accurate, and the error is reduced.

[0058] The speed regulation mode is built into the target detection model. The speed regulation mode of the fan is determined according to the fused correction temperature value, and the fan is steplessly regulated, including the following steps:

[0059] Set the threshold according to the fusion correction temperature value. When the fusion correction temperature value is lower than threshold I, set the speed regulation mode to the winter mode; when the fusion correction temperature value is higher than threshold I, set the speed regulation mode to the summer mode. Build a simulation model in the target detection model to simulate the position and blowing range of the fan, and simulate the cooling amplitude of the engine and the regional temperature at different fan speeds. Based on this, construct a control logic and embed it in the fan controller to perform stepless adjustment on the fan. In the model of the present invention, according to the position and blowing range of the fan, simulate the influence of the speed on the cooling value, which is convenient for accurately controlling the fan speed during subsequent stepless speed regulation to make it adapt to the cooling needs of the engine.

[0060] The winter mode includes the following steps: when the fusion correction temperature value is lower than threshold I and higher than the Y value, the fan controller controls the fan to start; the fan cools the engine at a constant speed suitable for being lower than threshold I until the fusion correction temperature is lower than the Y value, and then the fan stops; when the fusion correction temperature value is lower than the threshold Y value, the fan controller controls the fan to stop running. The present invention sets the threshold according to the fusion correction temperature value, uses threshold I as the standard to set the winter mode and the summer mode. In winter, set an additional Y value. When the fusion correction temperature value is higher than the Y value, control the fan to cool the engine at a constant speed. When it is lower than the Y value, the fan stops, reducing unnecessary stepless speed regulation, having a start-stop function, reducing the control burden of the controller, and saving energy.

[0061] The fan controller performs stepless adjustment on the fan, including the following steps: after the power is turned on, the capacitor in the speed regulation circuit is charged. When the voltage on the capacitor exceeds the blocking voltage of the trigger diode, the trigger diode conducts, causing the bidirectional thyristor to be triggered and conduct, and the fan gets voltage and starts to run; the fan controller changes the potentiometer in the speed regulation circuit to change its resistance value; thereby changing the trigger angle of the bidirectional thyristor, and also changing the working voltage across the motor winding; thus achieving the purpose of stepless voltage regulation, speed regulation, and air volume adjustment. The present invention changes the resistance value of the potentiometer in the speed regulation circuit; thereby changing the trigger angle of the bidirectional thyristor, and also changing the working voltage across the motor winding; thus achieving the purpose of stepless voltage regulation, speed regulation, and air volume adjustment, with electronic stepless speed change being more accurate.

[0062] Embodiment 2

[0063] According to Figure 1 、 3 As shown, this embodiment proposes a stepless speed regulation method for an automotive fan, including the following steps:

[0064] The real-time operating parameters of the engine are collected by using the collection sensor provided by the engine; specifically, the inlet and outlet temperatures of the cooling water of the engine are collected by using the collection sensor provided by the engine, and the difference is calculated to determine the real-time temperature data of the engine;

[0065] An infrared detection module is built into the engine compartment to obtain real-time temperature data of the environment around the engine, including real-time infrared thermal imaging images of the environment around the engine and temperature values ​​of corresponding areas in the image;

[0066] Based on the data collected by the infrared detection module, a target detection model is constructed. The following steps are performed: replace the residual layer of the YOLOv5 network with a dense convolution block in the infrared image collected by the infrared detection module; construct a feature pyramid containing three convolution layers of different scales, and fuse the feature pyramid with the deep dense network; use the Softmax function to classify the fused features to form a target detection model that includes engine and regional temperature features; use this model as the benchmark for subsequent fusion data to make the calculated data more accurate;

[0067] The temperature value collected by the engine's own acquisition sensor is input into the target detection model, and linearly weighted fused with the temperature value collected by the infrared detection module to obtain the fused and corrected temperature value, including the following steps:

[0068] Linearly weighted fusion of the temperature value collected by the engine's own acquisition sensor and the temperature value collected by the current infrared detection module to obtain T1; linearly weighted fusion of the temperature value collected by the engine's own acquisition sensor and the linear weighted fusion temperature value of the previous moment to obtain T2; linearly weighted fusion of the temperature value collected by the current infrared detection module and the linear weighted fusion temperature value of the previous moment to obtain T3; the obtained fusion temperature value (T1, T2, T3) * (Y1, Y2, Y3) A The fused correction temperature value RA is obtained, where Y1, Y2, and Y3 are algorithm fusion weight values, and A represents the specified time. The present invention uses the acquisition sensor provided by the engine to collect the real-time operating parameters of the engine, and uses the infrared detection module to obtain the real-time temperature data of the environment around the engine. The two sets of real-time temperature value data are linearly weighted fused to obtain the fused correction temperature value, and the weighted correction takes into account the influence of the engine's own temperature and the ambient temperature, so that it is closer to the accurate temperature value data of the engine, the data correction is accurate, and the error is reduced.

[0069] The speed regulation mode is built into the target detection model. The speed regulation mode of the fan is determined according to the fused correction temperature value, and the fan is steplessly regulated, including the following steps:

[0070] Set the threshold according to the fusion correction temperature value. When the fusion correction temperature value is lower than threshold I, set the speed regulation mode to winter mode; when the fusion correction temperature value is higher than threshold I, set the speed regulation mode to summer mode. Build a simulation model in the target detection model to simulate the position and blowing range of the fan, and simulate the cooling amplitude of the engine and the regional temperature at different fan speeds. Based on this, construct a control logic and embed it in the fan controller to perform stepless adjustment of the fan. In the model of the present invention, according to the position and blowing range of the fan, simulate the influence of the speed on the cooling value, which is convenient for accurately controlling the fan speed during subsequent stepless speed regulation to adapt to the cooling needs of the engine;

[0071] The summer mode includes the following steps: when the fusion correction temperature value is higher than threshold I, the fan controller controls the fan to start; calculate the value by which the current fusion correction temperature is higher than threshold I, and adjust the fan speed according to the cooling values of the engine and the regional temperature at different fan speeds in the control logic; continuously change the fan speed according to the difference between the real-time fusion correction temperature and threshold I to adapt to the cooling needs at different temperatures. The present invention sets the threshold according to the fusion correction temperature value, sets the winter mode and summer mode with threshold I as the standard. In summer, calculate the difference by which the current fusion correction temperature is higher than threshold I, and continuously adjust the fan speed according to the control logic in combination with the real-time difference to adapt to the cooling needs at different temperatures, which is more accurate.

[0072] The fan controller performs stepless adjustment of the fan, including the following steps: after the power is turned on, the capacitor in the speed regulation circuit is charged. When the voltage on the capacitor exceeds the blocking voltage of the trigger diode, the trigger diode conducts, causing the bidirectional thyristor to also trigger and conduct, and the fan gets voltage and starts to operate; the fan controller changes the potentiometer in the speed regulation circuit to change its resistance value; thereby changing the trigger angle of the bidirectional thyristor, and also changing the working voltage across the motor winding; thus achieving the purpose of stepless voltage regulation, speed regulation and air volume adjustment. The present invention changes the resistance value of the potentiometer in the speed regulation circuit; thereby changing the trigger angle of the bidirectional thyristor, and also changing the working voltage across the motor winding; thus achieving the purpose of stepless voltage regulation, speed regulation and air volume adjustment, and the electronic stepless speed change is more accurate.

[0073] The stepless speed regulation method of the automobile fan uses the acquisition sensor of the engine to collect the real-time operating parameters of the engine, uses the infrared detection module to obtain the real-time temperature data of the surrounding environment of the engine, linearly weightedly fuses the two sets of real-time temperature value data, obtains the fusion correction temperature value, and weighted correction takes into account the influence of the temperature of the engine itself and the ambient temperature, so that it is closer to the accurate temperature value data of the engine, the data correction is accurate, and the error is reduced. According to this accurate value, it is convenient to adaptively control the speed of the fan steplessly to adapt to the actual needs of the engine. In addition, the present invention sets a threshold value according to the fusion correction temperature value, and sets the winter mode and the summer mode with the threshold value I as the standard. In summer, the difference between the current fusion correction temperature and the threshold value I is calculated, and the speed of the fan is steplessly adjusted according to the control logic and the real-time difference to adapt to the cooling needs at different temperatures, which is more accurate. In winter, an additional Y value is set. When the fusion correction temperature value is higher than the Y value, the fan is controlled to cool the engine at a constant speed. When it is lower than the Y value, the fan stops, reducing unnecessary stepless speed regulation, and having a start-stop function, reducing the control burden of the controller, and saving energy. At the same time, the present invention changes the resistance value of the potentiometer in the speed control circuit, thereby changing the trigger angle of the bidirectional thyristor, so that the working voltage at both ends of the motor winding also changes accordingly; thereby achieving the purpose of stepless voltage and speed regulation and air volume adjustment, and the electronically controlled stepless speed change is more accurate.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A stepless speed regulation method for an automotive fan, characterized in that, The following steps are involved: Step 1: Use the engine's own acquisition sensor to collect the engine's real-time operating parameters; Step 2: Install an infrared detection module in the engine compartment to obtain real-time temperature data of the environment around the engine; Step 3: Build a target detection model based on the data collected by the infrared detection module; Step 4: Input the temperature value collected by the engine's own acquisition sensor into the target detection model, and perform linear weighted fusion with the temperature value collected by the infrared detection module to obtain the fused and corrected temperature value. Specifically: linearly weighted fusion of the temperature value collected by the engine's own acquisition sensor and the temperature value collected by the current infrared detection module to obtain T1, linearly weighted fusion of the temperature value collected by the engine's own acquisition sensor and the linear weighted fusion temperature value of the previous moment to obtain T2, linearly weighted fusion of the temperature value collected by the current infrared detection module and the linear weighted fusion temperature value of the previous moment to obtain T3, and obtain the fused temperature value (T1, T2, T3) * (Y1, Y2, Y3) A The fusion correction temperature value RA is obtained, where Y1, Y2, and Y3 are the algorithm fusion weight values, and A represents the specified time; Step 5: A speed control mode is built into the target detection model, and the speed control mode of the fan is determined according to the fusion correction temperature value, and the fan is steplessly adjusted in speed. Specifically, a threshold is set according to the fusion correction temperature value, and when the fusion correction temperature value is lower than the threshold value I, the speed control mode is set to the winter mode, and when the fusion correction temperature value is higher than the threshold value I, the speed control mode is set to the summer mode. A simulation model is constructed in the target detection model to simulate the position and blowing range of the fan, and the extent of cooling the engine and regional temperature at different fan speeds. In this way, a control logic is constructed and built into the fan controller to steplessly adjust the fan.

2. The stepless speed regulation method for an automotive fan according to claim 1, characterized in that: In the step 1, the inlet and outlet temperatures of the cooling water of the engine are collected by using the collection sensor provided by the engine, and the difference is calculated to determine the real-time temperature data of the engine.

3. The stepless speed regulation method for an automotive fan according to claim 2, characterized in that: In the step 2, the real-time temperature data of the engine is obtained, including a real-time infrared thermal imaging image of the environment around the engine and a temperature value of a corresponding area in the image.

4. The stepless speed regulation method for an automotive fan according to claim 3, characterized in that: In step 3, building a target detection model includes the following steps: In the infrared images collected by the infrared detection module, the residual layer of the YOLOv5 network is replaced with a dense convolutional block; Construct a feature pyramid with three convolutional layers of different scales and fuse the feature pyramid with a deep dense network; The Softmax function is used to classify the fused features to form a target detection model that includes engine and regional temperature features.

5. The stepless speed regulation method for an automotive fan according to claim 4, characterized in that: In step 5, the winter mode includes the following steps: When the fusion correction temperature value is lower than the threshold value I and higher than the value Y, the fan controller controls the fan to start; The fan cools the engine at a constant speed suitable for being below the threshold I until the fusion correction temperature is below the value Y, and the fan stops; When the fusion correction temperature value is lower than the threshold value Y, the fan controller controls the fan to stop running.

6. The stepless speed regulation method for an automotive fan according to claim 4, characterized in that: In step 5, the summer mode includes the following steps: When the fusion correction temperature value is higher than the threshold value I, the fan controller controls the fan to start; Calculate the value of the current fusion correction temperature higher than the threshold value I, and adjust the fan speed according to the value of the cooling effect of different fan speeds on the engine and regional temperature in the control logic; The fan speed is changed steplessly according to the difference between the real-time fusion correction temperature and the threshold I to adapt to the cooling needs under different temperatures.

7. The stepless speed regulation method for an automotive fan according to claim 4, characterized in that: In step 5, the fan controller performs stepless adjustment on the fan, including the following steps: After the power is turned on, the capacitor in the speed control circuit is charged. When the voltage on the capacitor exceeds the blocking voltage of the trigger diode, the trigger diode is turned on, causing the bidirectional thyristor to also be triggered and turned on, and the fan receives voltage and starts to run. The fan controller changes the potentiometer in the speed control circuit, changing its resistance value; This changes the trigger angle of the bidirectional thyristor, causing the operating voltage at both ends of the motor winding to change accordingly; Thus, the purpose of stepless voltage regulation, speed regulation and air volume regulation is achieved.

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