Vehicle cooling fan control method and system, computer readable storage medium and program product

Abstract

The invention discloses a control method and system for a vehicle cooling fan, a computer readable storage medium and a program product in the technical field of vehicle engine cooling. The technical problem that a vehicle without an ECU lacks a fan control method matched with the cooling requirement in real time is solved. The system comprises a fan controller used for obtaining start-stop signals or temperature of vehicle parts; according to the start-stop signal or the temperature of the vehicle part, a plurality of fan rotating speed control schemes are formulated in parallel; aligning the control schemes of the rotating speeds of the plurality of fans in time, selecting an optimal heat dissipation efficiency scheme from the control schemes of the rotating speeds of the plurality of fans in real time, and controlling the rotating speeds of the fans according to the optimal heat dissipation efficiency scheme; according to the control method and system for the vehicle cooling fan, real-time matching between the cooling efficiency of the fan and the cooling requirements of all parts of the vehicle is achieved, the calculated amount is low, and the control method and system can be executed on the fan controller without depending on an engine ECU.

Description

Technical Field

[0001] The present invention relates to a control method, system, computer-readable storage medium and program product of a vehicle cooling fan, belonging to the technical field of vehicle engine cooling. Background Art

[0002] The prior art is based on the engine controller ECU controlling the cooling fan to dissipate heat for the engine and related heat sources. Therefore, the industry formulates the fan speed control strategy based on what can be implemented on the engine controller ECU.

[0003] However, due to factors such as low cost, tolerance to inferior fuel, and economic acceptance, ECU-free engines still occupy a large market in underdeveloped regions. For ECU-free engines, heat dissipation mainly relies on the fan running at full speed or fixed speed, resulting in a long-term mismatch between the fan heat dissipation efficiency and the vehicle driving state. It is easy for the vehicle components to generate a surge in heat under special working conditions but the fan cannot run at high speed, or the fan heat dissipation efficiency exceeds the vehicle component requirements, resulting in energy waste. Therefore, existing ECU-free vehicles lack a fan control method that matches the heat dissipation requirements in real time. Summary of the invention

[0004] The purpose of this application is to overcome the deficiencies in the prior art and to provide a control method, system, computer-readable storage medium and program product for a vehicle cooling fan that does not rely on an engine ECU and can achieve real-time matching with cooling requirements.

[0005] In order to achieve the above objectives, this application is implemented by adopting the following technical solutions: In a first aspect, the present application provides a method for controlling a vehicle cooling fan, which is executed by a fan controller, comprising: Obtain start / stop signals or temperatures of vehicle components; Formulate multiple fan speed control schemes in parallel according to the start / stop signal or temperature of the vehicle component; The plurality of fan speed control schemes are aligned in time, a scheme with the best heat dissipation efficiency is selected from the plurality of fan speed control schemes in real time, and the fan speed is controlled according to the scheme with the best heat dissipation efficiency.

[0006] In some embodiments of the first aspect of the present application, the start / stop signal of the vehicle component includes a start / stop signal of a hydraulic buffer controller; The fan speed control scheme includes: In response to the liquid buffer controller being turned on, maintaining the fan rotation at a maximum speed; In response to the liquid buffer controller being turned off, the fan maintains the highest speed for a set period of time and then stops.

[0007] In some embodiments of the first aspect of the present application, the start / stop signal of the vehicle component includes a start / stop signal of an air-conditioning compressor; The fan speed control scheme includes: In response to the air conditioning compressor being turned on, maintaining the fan rotation at a first predetermined speed; In response to the air conditioning compressor being turned off, the speed of the fan is 0.

[0008] In some embodiments of the first aspect of the present application, the temperature of the vehicle component includes an engine water temperature value; The fan speed control scheme includes: According to the preset engine water temperature and fan speed correspondence table, select the speed corresponding to the engine water temperature value obtained in real time.

[0009] In some embodiments of the first aspect of the present application, the temperature of the vehicle component includes an engine intake air temperature value; The fan speed control scheme includes: According to a preset correspondence table between engine intake air temperature and fan speed, a speed corresponding to the engine intake air temperature obtained in real time is selected.

[0010] In some embodiments of the first aspect of the present application, the real-time selection of the optimal heat dissipation efficiency scheme from the multiple fan speed control schemes includes selecting the scheme with the highest real-time speed from the multiple fan speed control schemes as the optimal heat dissipation efficiency scheme.

[0011] In some embodiments of the first aspect of the present application, after controlling the speed of the fan according to the optimal heat dissipation efficiency solution, Get the actual speed of the fan and the speed control performed; In response to a slip between the executed speed control and the actual speed reaching a first threshold, the fan is controlled to rotate at a maximum speed.

[0012] In a second aspect, the present application also provides a control system for a vehicle cooling fan, comprising: A fan and a fan controller electrically connected to the fan; The fan controller is used to: obtain the start / stop signal or temperature of a vehicle component; formulate multiple fan speed control schemes in parallel according to the start / stop signal or temperature of the vehicle component; align the multiple fan speed control schemes in time, select the best heat dissipation efficiency scheme from the multiple fan speed control schemes in real time, and control the fan speed according to the best heat dissipation efficiency scheme.

[0013] In some embodiments of the second aspect of the present application, at least one of the following is also included: A liquid buffer controller, used to send its start and stop signals to the fan controller; An air-conditioning compressor, used to send its start and stop signals to the fan controller; An engine water temperature sensor, used to send the engine water temperature value to the fan controller; An engine intake air temperature sensor, used to send the engine water temperature value to the fan controller; The fan controller is further configured to: In response to the liquid buffer controller being turned on, the fan is maintained to rotate at the highest speed; in response to the liquid buffer controller being turned off, the fan is maintained at the highest speed for a set period of time and then stops; or, in response to the air conditioning compressor being turned on, the fan is maintained to rotate at a first predetermined speed; in response to the air conditioning compressor being turned off, the fan speed is 0; Or, according to a preset engine water temperature and fan speed correspondence table, select a speed corresponding to the engine water temperature value obtained in real time; Alternatively, according to a preset correspondence table between engine intake air temperature and fan speed, a speed corresponding to the engine intake air temperature acquired in real time is selected.

[0014] In some embodiments of the second aspect of the present application, a fan speed sensor is used to send an actual speed of the fan to the fan controller; The fan controller is further configured to: obtain an actual rotational speed of the fan and an executed rotational speed control; and control the fan to rotate at a maximum rotational speed in response to a slip between the executed rotational speed control and the actual rotational speed reaching a first threshold.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The vehicle cooling fan control method and system provided in the present application not only realize the real-time matching between the cooling efficiency of the fan and the cooling requirements of various vehicle components, but also has low computational complexity and can be executed on the fan controller without relying on the engine ECU. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a flow chart of the steps of the vehicle cooling fan control method provided by this embodiment; Figure 2is a structural schematic diagram of a control system of a vehicle cooling fan provided by the present embodiment; In the figure: 1. Fan controller; 2. Liquid buffer controller; 3. Air conditioning compressor; 4. Engine water temperature sensor; 5. Engine intake air temperature sensor; 6. Fan; 7. Fan speed sensor. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0019] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship. Embodiment 1

[0020] Figure 1 This is a flow chart of a method for controlling a vehicle cooling fan in Embodiment 1 of the present invention. This flow chart only shows the logical sequence of the method described in this embodiment. In other possible embodiments of the present invention, different methods may be used without conflict. Figure 1 The steps shown or described are accomplished in the order shown.

[0021] The vehicle cooling fan control method provided in this embodiment can be executed by a fan controller 1, which can be implemented by software and / or hardware. The method of this embodiment specifically includes the following steps: Obtain start / stop signals or temperatures of vehicle components; Formulate multiple fan speed control schemes in parallel according to the start / stop signals or temperature of vehicle components; The plurality of fan speed control schemes are aligned in time, the scheme with the best heat dissipation efficiency is selected from the plurality of fan speed control schemes in real time, and the speed of the fan 6 is controlled according to the scheme with the best heat dissipation efficiency.

[0022] This embodiment takes into account that compared with the ECU, the logic control capability of the fan controller 1 is relatively low, and it is not suitable for setting complex speed control schemes according to driving factors such as vehicle speed, vehicle condition, and steering. At the same time, the heat dissipation requirements of various components are different, so this embodiment directly formulates the fan speed control scheme based on the needs of vehicle components. By directly obtaining the start and stop signals of vehicle components and the temperature of vehicle components, the fan controller 1 can formulate a suitable fan speed control scheme more appropriately with a lower amount of calculation or logic processing; the amount of calculation or logic processing required when the fan controller 1 formulates a suitable fan speed control scheme is relatively low, which also leaves redundancy of computing resources for subsequent parallel formulation of control schemes.

[0023] Since different vehicle components require different cooling time and cooling efficiency when starting or stopping, and different vehicle components require different cooling efficiency when working, the fan controller 1 in this embodiment does not need to implement a fusion cooling strategy, but instead simultaneously and in parallel formulates multiple fan speed control schemes based on the start-stop signal or temperature of the vehicle components. A single fan speed control scheme is only for the start-stop signal or temperature of one vehicle component.

[0024] Then, the multiple fan speed control schemes are aligned in time, and the fan controller 1 compares each fan speed control scheme in real time, and selects the control scheme with the best heat dissipation efficiency as the scheme actually applied to the speed of the fan 6. The advantages of this are: 1. The heat dissipation efficiency of the fan 6 can meet the vehicle components with the largest heat dissipation demand to avoid overheating; 2. The heat dissipation efficiency of the fan 6 only meets the current heat dissipation demand, and there is no overflow of heat dissipation efficiency, which saves energy.

[0025] Therefore, the vehicle cooling fan control method provided in this embodiment not only realizes the real-time matching between the cooling efficiency of the fan 6 and the cooling requirements of various vehicle components, but also has low computational complexity and can be executed on the fan controller 1 without relying on the engine ECU.

[0026] It is worth noting that the specific implementation method of "selecting the best heat dissipation efficiency scheme from multiple fan speed control schemes in real time" includes re-selecting the best heat dissipation efficiency scheme in each time period.

[0027] It is worth noting that among the multiple fan speed control schemes formulated by the fan controller 1 according to the start-stop signals and temperatures of different vehicle components, only the one with the highest heat dissipation efficiency will be executed as the final scheme, and the other schemes are in a state of maintaining logical operations and "pressing down and not showing"; for example, at time t=10s, the first scheme has the best heat dissipation efficiency, and the second scheme has the second best heat dissipation efficiency, then the first scheme is used as the scheme with the best heat dissipation efficiency; at t=20s, the heat dissipation efficiency of the second scheme is greater than the first scheme, then the second scheme is used as the scheme with the best heat dissipation efficiency; t=30s-39s, according to the start-stop signal or temperature of a certain vehicle component, the third scheme is formulated, the heat dissipation efficiency of the first scheme is always lower than the second and third schemes, and the heat dissipation efficiency of the third scheme fluctuates up and down, sometimes exceeding the second scheme and replacing the second scheme as the scheme with the best heat dissipation efficiency, and sometimes lower than the second scheme, making the second scheme the scheme with the best heat dissipation efficiency; at t=40s, the heat dissipation efficiency of the first scheme exceeds the second and third schemes, and becomes the scheme with the best heat dissipation efficiency to control the speed of the fan 6. The above content is only an example to prevent misunderstanding, and does not mean that the same process will occur in actual applications. Embodiment 2

[0028] This embodiment provides a method for controlling a vehicle cooling fan. This embodiment is optimized on the basis of the first embodiment to improve the technical effect and refine the technical solution. For details not fully described in this embodiment, please refer to the first embodiment.

[0029] As the most important heat source related to the engine in the vehicle, the vehicle component that needs to dissipate heat in this embodiment includes the liquid buffer controller 2, and the start / stop signal of the vehicle component includes the start / stop signal of the liquid buffer controller 2; for the liquid buffer controller 2, the corresponding fan speed control scheme includes, in response to the liquid buffer controller 2 being turned on, maintaining the fan 6 rotating at the highest speed; In response to the liquid buffer controller 2 being turned off, the fan 6 maintains the highest speed for a set time and then stops. As one embodiment, the set time is one minute.

[0030] The liquid buffer controller 2 will generate a large amount of heat when decelerating the engine, so the fan 6 is kept at the highest speed to meet the heat dissipation needs of the liquid buffer controller 2, and the liquid buffer controller 2 is still cooled for a period of time after the liquid buffer controller 2 is turned off; the liquid buffer controller 2 generates a lot of heat, so it needs to be cooled in a more saturated manner.

[0031] As another vehicle component that needs heat dissipation, the air conditioning compressor 3 has a smaller heat dissipation than the liquid buffer controller 2, so its importance is not as high as the liquid buffer controller 2, and it does not need a higher degree of heat dissipation. As one embodiment, the start and stop signal of the vehicle component includes the start and stop signal of the air conditioning compressor 3, and the corresponding fan speed control scheme includes: In response to the air conditioning compressor 3 being turned on, the fan 6 is maintained to rotate at a first predetermined speed. In one embodiment, the first predetermined speed is 900 revolutions per minute. In response to the air-conditioning compressor 3 being turned off, the rotation speed of the fan 6 is zero.

[0032] The first predetermined speed is set according to the average or maximum heat dissipation demand of the air-conditioning compressor 3. When the air-conditioning compressor 3 is turned off, the speed of the fan 6 is reduced to 0 to reduce energy consumption. It is worth noting that, considering that some fans 6 may have a strategy of executing the minimum speed instead of stopping when there is no signal input, the "reducing the speed of the fan 6 to 0" is limited to the control scheme for the fan speed of the air-conditioning compressor 3, and the "speed of 0" may be covered by the strategy of "executing the minimum speed".

[0033] The heat dissipation of the engine includes air cooling and liquid cooling. An engine intake air temperature sensor 5 can be installed on the pipeline between the intercooler air outlet and the engine air intake to obtain the engine intake air temperature, or an engine water temperature sensor 4 can be installed between the engine cooling water outlet and the cooler cooling core water inlet to obtain the engine water temperature.

[0034] The engine water temperature and the engine intake air temperature are physical quantities that directly represent the heat dissipation demand. A correspondence table between different engine water temperatures or different engine intake air temperatures and engine speeds can be pre-set. When the vehicle is running, the corresponding fan speed control scheme includes: selecting the speed corresponding to the real-time engine water temperature value according to the pre-set engine water temperature and fan speed correspondence table; selecting the speed corresponding to the real-time engine intake air temperature according to the pre-set engine intake air temperature and fan speed correspondence table.

[0035] Compared with controlling the fan speed according to the start / stop signal of the vehicle component, directly controlling the speed of the fan 6 according to the position of the vehicle component temperature in the corresponding table requires less calculation and is more conducive to executing the control method of the vehicle cooling fan on the fan controller 1.

[0036] As one embodiment, the best heat dissipation efficiency scheme is selected from multiple fan speed control schemes in real time, including selecting the scheme with the highest real-time speed from multiple fan speed control schemes as the best heat dissipation efficiency scheme. The speed of the fan 6 is positively correlated with its heat dissipation efficiency, that is, the scheme with the fastest speed is selected from the multiple parallel fan speed control schemes in real time to ensure the best heat dissipation efficiency in real time.

[0037] When the fan 6 ages or has a mechanical failure, the actual speed may not reach the speed designed by the control scheme, resulting in the heat dissipation efficiency failing to meet the heat dissipation requirements. As one embodiment, after controlling the speed of the fan 6 according to the optimal heat dissipation efficiency scheme, Obtaining the actual speed of fan 6 and the speed control performed; In response to the slip between the executed speed control and the actual speed reaching the first threshold, it means that the actual speed of the fan 6 is lower than the speed control output by the fan controller 1 according to the optimal heat dissipation efficiency solution, and the difference has exceeded the error range. In order to ensure heat dissipation safety, the fan controller 1 controls the fan 6 to rotate at the highest speed at this time.

[0038] In summary, the control method of the vehicle cooling fan provided in this embodiment provides a control scheme for the fan speed that is specifically formulated according to the start-stop signals or temperatures of different vehicle components, and also provides a method for how to select the scheme with the highest heat dissipation efficiency from a variety of fan speed control schemes, and provides a response strategy when there is a gap between the speed control performed by fan 6 and the actual speed. Compared with embodiment one, this embodiment better solves the effect of real-time matching of heat dissipation efficiency and heat dissipation requirements. Embodiment 3

[0039] This embodiment provides a control system for a vehicle cooling fan, including a fan 6 and a fan controller 1 connected to the fan 6 by electrical signals; The fan controller 1 is used to execute the control method of the vehicle cooling fan described in Example 1, and the rotation speed of the fan 6 is controlled according to the method, which includes: obtaining the start / stop signal or temperature of the vehicle component; formulating multiple fan speed control schemes in parallel according to the start / stop signal or temperature of the vehicle component; aligning the multiple fan speed control schemes in time, selecting the best heat dissipation efficiency scheme from the multiple fan speed control schemes in real time, and controlling the rotation speed of the fan 6 according to the best heat dissipation efficiency scheme.

[0040] The control system of the vehicle cooling fan provided in this embodiment has the same technical effects as that of the first embodiment, which will not be described in detail here. Embodiment 4

[0041] This embodiment provides a control system for a vehicle cooling fan, which is improved on the basis of the third embodiment. For details not provided, please refer to the third embodiment.

[0042] refer to Figure 2 Compared with the third embodiment, the control system of the vehicle cooling fan provided in this embodiment further includes: a liquid buffer controller 2, which is used to send its start and stop signals to the fan controller 1; The air-conditioning compressor 3 is used to send its start and stop signals to the fan controller 1; The engine water temperature sensor 4 is used to send the engine water temperature value to the fan controller 1; The engine intake air temperature sensor 6 is used to send the engine water temperature value to the fan controller 1.

[0043] Correspondingly, the fan controller 1 is at least further used for: In response to the liquid buffer controller 2 being turned on, the fan 6 is kept rotating at the highest speed; in response to the liquid buffer controller 2 being turned off, the fan 6 is kept rotating at the highest speed for a set period of time and then stops; In response to the air conditioning compressor 3 being turned on, the fan 6 is maintained to rotate at a first predetermined speed; in response to the air conditioning compressor 3 being turned off, the speed of the fan 6 is 0; According to the preset engine water temperature and fan speed correspondence table, select the speed corresponding to the engine water temperature value obtained in real time; According to a preset correspondence table between engine intake air temperature and fan speed, a speed corresponding to the engine intake air temperature obtained in real time is selected.

[0044] In addition, the fan controller 1 is also used to select a scheme with the highest real-time rotation speed from a plurality of fan rotation speed control schemes as a scheme with the best heat dissipation efficiency.

[0045] The control system of the vehicle cooling fan further includes a fan speed sensor 7 for sending the actual speed of the fan 6 to the fan controller 1. Therefore, the fan controller 1 is also used to: obtain the actual speed of the fan 6 and the speed control performed; in response to the slip between the speed control performed and the actual speed reaching a first threshold, control the fan 6 to rotate at the highest speed.

[0046] The control system of the vehicle cooling fan provided in this embodiment has the same technical effects as those of the first or second embodiment, which will not be described in detail here.

[0047] As one of the embodiments, the fan controller 1 controls the electronically controlled silicone oil clutch of the fan 6 through a hard line, and controls the speed of the fan 6 according to the PWM duty cycle corresponding to the fan speed, wherein when the duty cycle is 0, that is, there is no PWM signal, it runs at full speed, and when the value is 100%, the fan speed is the lowest separation speed value of the fan and the clutch.

[0048] As one embodiment, the fan 6 controller 1 is connected to other vehicle components via a CAN bus.

[0049] As one of the embodiments, the present embodiment also includes a vehicle-mounted communication terminal Tbox (including GPS function), which can collect real-time data of the actual operating conditions of the vehicle or data stored in the data recorder and upload it to a remote big data platform. Focus on monitoring the three main operating conditions of acceleration, uniform speed, and deceleration during vehicle operation. By comparing the real-time basic speed and target speed of the fan 6, the speed difference (or slip value) is obtained to determine whether the fan 6 is in an acceleration, original speed or deceleration state, and the corresponding operating parameters are statistically analyzed accordingly. According to the GPS segmentation, the data can be collected according to the characteristic sections for key typical operating condition information, and the regular statistical analysis of the same operating condition parameters can be performed. According to the basic water temperature and the target water temperature, the target water temperature difference is obtained as the amount to be adjusted. According to the basic intake temperature and the target intake temperature, the target intake temperature difference is obtained as the adjustment amount. According to the engine speed and the speed sensor of the gearbox, the gear ratio (usually a manual gearbox, data calculation is required to obtain the gear information) is obtained, and it is used as one of the operating condition classification factors for data analysis. The real-time ambient temperature can be collected through a variety of channels, such as the big data platform collecting the local temperature, the temperature value of the air conditioner outdoor temperature sensor sent by the instrument or air conditioner controller, or the temperature value of the ambient temperature sensor sent by the instrument and other controllers, and calculating the temperature difference between the ambient temperature and the water temperature or intake air temperature of the cooler. The big data platform uses a wide range of data to analyze the same or similar water temperature or intake air temperature difference of the same project under the same working conditions, and the data of the time required for the temperature adjustment to meet the standard when the adjustment time does not exceed the standard and the corresponding temperature does not exceed the temperature, and gradually reduce the speed target value, extend the time required for the water temperature to meet the standard, and gradually optimize and improve until the temperature control does not exceed the standard and the temperature adjustment speed is relatively slow and gentle. The higher the speed of fan 6, the more conducive it is to quickly achieve temperature adjustment for cooling, but it will also cause a waste of engine power torque, thereby increasing vehicle fuel consumption and reducing power. Therefore, under the condition of meeting the needs, appropriately reducing the speed and adjustment speed of fan 6 and extending the temperature adjustment cycle will be conducive to achieving the temperature adjustment goal that meets the needs with lower torque and power loss. Under this logic, big data analysis is performed based on historical data, and PID parameters are intelligently optimized based on the existing calibrated PID parameter values. Remote flash calibration is initiated through the operation platform, and data is automatically sent to the Tbox of the corresponding vehicle. The corresponding PID parameters in the fan 6 controller are optimized through CAN flash, or the lookup table values ​​of each parameter are changed and optimized to improve the vehicle's energy consumption performance, and long-term optimization and iteration are performed to achieve the control parameters that best meet the working conditions, thereby minimizing fuel consumption costs. Verification and upgrades can be performed by batch updating after verifying the same parameters for local vehicles on the same section at the same time, or by verifying single vehicles or multiple vehicles with different parameters, and taking the best solution for batch updating.

[0050] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0051] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0052] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0053] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0054] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling a vehicle cooling fan, Its characteristics are: Executed by the fan controller (1), including, Obtain start / stop signals or temperatures of vehicle components; Formulate multiple fan speed control schemes in parallel according to the start / stop signal or temperature of the vehicle component; The plurality of fan speed control schemes are aligned in time, the optimal heat dissipation efficiency scheme is selected from the plurality of fan speed control schemes in real time, and the speed of the fan (6) is controlled according to the optimal heat dissipation efficiency scheme.

2. The method for controlling a vehicle cooling fan according to claim 1, Its characteristics are: The start / stop signal of the vehicle component comprises a start / stop signal of a hydraulic buffer controller (2); The fan speed control scheme includes: In response to the liquid buffer controller (2) being turned on, the fan (6) is maintained rotating at a maximum speed; In response to the liquid buffer controller (2) being turned off, the fan (6) maintains the highest speed for a set period of time and then stops.

3. The method for controlling a vehicle cooling fan according to claim 1, Its characteristics are: The start / stop signal of the vehicle component comprises a start / stop signal of an air-conditioning compressor (3); The fan speed control scheme includes: In response to the air conditioning compressor (3) being turned on, maintaining the fan (6) rotating at a first predetermined speed; In response to the air conditioning compressor (3) being turned off, the rotation speed of the fan (6) is 0.

4. The method for controlling a vehicle cooling fan according to claim 1, Its characteristics are: The temperature of the vehicle component includes the engine water temperature value; The fan speed control scheme includes: According to the preset engine water temperature and fan speed correspondence table, select the speed corresponding to the engine water temperature value obtained in real time.

5. The method for controlling a vehicle cooling fan according to claim 1, Its characteristics are: The temperature of the vehicle component includes an engine intake temperature value; The fan speed control scheme includes: According to a preset correspondence table between engine intake air temperature and fan speed, a speed corresponding to the engine intake air temperature obtained in real time is selected.

6. The method for controlling a vehicle cooling fan according to claim 1, Its characteristics are: The real-time selection of the best heat dissipation efficiency scheme from the plurality of fan speed control schemes includes selecting the scheme with the highest real-time speed from the plurality of fan speed control schemes as the best heat dissipation efficiency scheme.

7. The method for controlling a vehicle cooling fan according to claim 1, Its characteristics are: After the rotation speed of the fan (6) is controlled according to the optimal heat dissipation efficiency solution, Obtaining the actual speed of the fan (6) and the speed control performed; In response to the slip between the executed speed control and the actual speed reaching a first threshold, the fan (6) is controlled to rotate at a maximum speed.

8. A control system for a vehicle cooling fan, It is characterized in that include, A fan (6) and a fan controller (1) connected to the fan (6) by electrical signals; The fan controller (1) is used to: obtain a start / stop signal or temperature of a vehicle component; formulate multiple fan speed control schemes in parallel according to the start / stop signal or temperature of the vehicle component; align the multiple fan speed control schemes in time, select the optimal heat dissipation efficiency scheme from the multiple fan speed control schemes in real time, and control the speed of the fan (6) according to the optimal heat dissipation efficiency scheme.

9. The control system of the vehicle cooling fan according to claim 8, It is characterized in that At least one of the following is included: A liquid buffer controller (2), used for sending its start / stop signal to the fan controller (1); An air-conditioning compressor (3), configured to send its start / stop signal to the fan controller (1); An engine water temperature sensor (4), used for sending an engine water temperature value to the fan controller (1); An engine intake air temperature sensor (6), used for sending an engine water temperature value to the fan controller (1); The fan controller (1) is at least further used for: In response to the liquid buffer controller (2) being turned on, the fan (6) is maintained to rotate at the highest speed; in response to the liquid buffer controller (2) being turned off, the fan (6) is maintained at the highest speed for a set period of time and then stops; Or, in response to the air-conditioning compressor (3) being turned on, the fan (6) is maintained in rotation at a first predetermined speed; in response to the air-conditioning compressor (3) being turned off, the speed of the fan (6) is 0; Or, according to a preset engine water temperature and fan speed correspondence table, select a speed corresponding to the engine water temperature value obtained in real time; Alternatively, according to a preset correspondence table between engine intake air temperature and fan speed, a speed corresponding to the engine intake air temperature acquired in real time is selected.

10. The control system of the vehicle cooling fan according to claim 8, further comprising a fan speed sensor (7) for sending the actual speed of the fan (6) to the fan controller (1); The fan controller (1) is further used to: obtain the actual rotational speed of the fan (6) and the executed rotational speed control; and control the fan (6) to rotate at a maximum rotational speed in response to a slip between the executed rotational speed control and the actual rotational speed reaching a first threshold.

Images