Fan control circuit, method and device

Abstract

The invention relates to the technical field of vehicle control, and provides a fan control circuit, method and device. The control circuit comprises a direct-current converter used for converting a first preset direct-current voltage in the vehicle into a second preset direct-current voltage, and the second preset direct-current voltage is smaller than the first preset direct-current voltage; a first port of each fan is connected with the positive electrode end of the output end of the direct-current converter, a second port of each fan is connected with the negative electrode end of the output end of the direct-current converter, and a third port of each fan is correspondingly connected with the control signal output end of the vehicle control unit and is used for starting in stages according to control signals output by the vehicle control unit for heat dissipation. The fan can be started in stages, impact on a circuit is reduced while heat dissipation is achieved, in addition, the fan is started in stages, unnecessary energy waste can be reduced, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and in particular, to a control circuit, method, and device for a fan. Background Art

[0002] With the development of new energy mining trucks and the diversified construction machinery ecosystem, the electrical accessories on mining trucks have gradually increased, so the requirements for the heat dissipation performance of fans have also been increasing day by day. Since the power batteries and a large number of electrical components on mining trucks work simultaneously, a large amount of heat will be generated. If the heat cannot be dissipated in time, it will cause the power batteries and electrical components to overheat, thus affecting the performance and lifespan of electric mining trucks. Installing a cooling fan on a mining truck is to ensure that the power batteries and electrical components of a new energy mining truck can dissipate heat normally, thereby improving the service performance of the mining truck.

[0003] Currently, on new energy mining trucks, a direct current converter (DCDC) is combined with a storage battery to drive a fan for heat dissipation, that is, the output end of the direct current converter is connected to the storage battery, and the storage battery is connected to multiple fans to supply power to the multiple fans.

[0004] Although the energy released by the storage battery can reduce the impact of starting the fan, the synchronous start and stop of the fan still cause a relatively large impact on the circuit, high energy consumption, easy damage to the power supply, and easy to cause circuit interference between electrical components, resulting in poor heat dissipation effect and affecting the vehicle lifespan. Summary of the Invention

[0005] Embodiments of the present invention provide a control circuit, method, and device for a fan to solve the problems of large circuit impact, high energy consumption, and poor heat dissipation effect caused by synchronous driving of fans in the prior art.

[0006] In a first aspect, embodiments of the present invention provide a control circuit for a fan, including: a direct current converter, at least two fans, and a vehicle controller;

[0007] The direct current converter is configured to convert a first preset direct current voltage in the vehicle into a second preset direct current voltage, and the second preset direct current voltage is less than the first preset direct current voltage;

[0008] The first port of each fan is connected to the positive extreme of the output end of the direct current converter, the second port of each fan is connected to the negative extreme of the output end of the direct current converter, and the third port of each fan is correspondingly connected to the control signal output end of the vehicle controller, and is configured to start in stages according to the control signal output by the vehicle controller for heat dissipation.

[0009] In a possible implementation manner, it further includes: at least two resistors, and the number of resistors is the same as the number of fans;

[0010] One end of each resistor is connected between the third port of the corresponding fan and the corresponding control port of the vehicle controller, and the other end of each resistor is grounded.

[0011] In a possible implementation, it further includes: at least two fuses, and the number of fuses is the same as the number of fans;

[0012] One end of each fuse is connected to the positive extreme of the output end of the DC converter, and the other end of each fuse is connected to the first port of the corresponding fan.

[0013] In a second aspect, an embodiment of the present invention provides a method for controlling a fan, which uses the fan control circuit described in the first aspect or any one of the possible implementation manners in the first aspect. The method for controlling the fan includes:

[0014] Obtain the temperature of electrical components on the vehicle in real time;

[0015] When the temperature meets the first preset condition, turn on any fan that is currently in the off state according to the temperature;

[0016] If the rotation speed of the fan meets the second preset condition, jump to the step of "obtain the temperature of electrical components on the vehicle in real time" and execute until the vehicle is powered off.

[0017] In a possible implementation manner, the obtaining the temperature of electrical components on the vehicle in real time includes:

[0018] Obtain the temperature of the DC converter, the main drive motor temperature, the auxiliary drive motor temperature, the brake air pump temperature, and the steering pump temperature on the vehicle in real time, and use the temperature of the electrical component with the highest temperature among the temperature of the DC converter, the main drive motor temperature, the auxiliary drive motor temperature, the brake air pump temperature, and the steering pump temperature as the current temperature.

[0019] In a possible implementation manner, when the temperature meets the first preset condition, turning on any fan that is currently in the off state according to the temperature includes:

[0020] When the current temperature is greater than the temperature threshold, determine the fan start rotation speed according to the current temperature;

[0021] Determine the corresponding fan start duty cycle according to the fan start rotation speed;

[0022] Control any fan that is currently in the off state to start rotating at the fan start duty cycle, and increase the fan start duty cycle to a preset duty cycle.

[0023] In a possible implementation, after determining the fan starting speed according to the current temperature, the following steps are further included:

[0024] Determine the fan target speed according to the current temperature;

[0025] Determine the corresponding fan target duty cycle according to the fan target speed;

[0026] Increasing the fan starting duty cycle to a preset duty cycle includes:

[0027] Control the fan starting duty cycle to increase to the fan target duty cycle.

[0028] In a possible implementation, the following steps are further included:

[0029] If the current temperature is not greater than the temperature threshold, do not turn on a fan that is currently in the off state, or turn off the fan with the shortest on time, and jump to the step of "real-time obtaining the temperature of electrical components on the vehicle" for execution.

[0030] In a possible implementation, if the speed of the fan meets the second preset condition, jump to the step of "real-time obtaining the temperature of electrical components on the vehicle" for execution, including:

[0031] If the speed of the fan is the fan target speed and after reaching the fan target speed for a preset time, jump to the step of "real-time obtaining the temperature of electrical components on the vehicle" for execution.

[0032] In a third aspect, an embodiment of the present invention provides a control device for a fan, which adopts the fan control circuit described in the first aspect or any one of the possible implementation manners in the first aspect. The control device for the fan includes:

[0033] An acquisition module, configured to obtain the temperature of electrical components on the vehicle in real time;

[0034] A control module, configured to turn on any fan that is currently in the off state according to the temperature when the temperature meets the first preset condition;

[0035] The control module is further configured to jump to the step of "real-time obtaining the temperature of electrical components on the vehicle" for execution if the speed of the fan meets the second preset condition, until the vehicle is powered off.

[0036] An embodiment of the present invention provides a control circuit, method, and device for a fan. The DC converter in the control circuit of the fan can convert the first preset DC voltage in the vehicle into the second preset DC voltage to provide the voltage required for each fan to rotate. The first port of each fan is connected to the positive terminal of the output end of the DC converter, the second port of each fan is connected to the negative terminal of the output end of the DC converter, and the third port of each fan is correspondingly connected to the control signal output end of the vehicle controller, and is used to start in stages according to the control signal output by the vehicle controller for heat dissipation. In the embodiment of the present invention, the vehicle controller controls each fan to start in stages, while ensuring the cooling effect, reducing the impact on the circuit caused by the starting current of the fan, reducing the energy consumption of the fan, reducing the damage to the fan caused by frequently starting and stopping the fan simultaneously according to the temperature in the prior art, and the circuit interference between electrical components, improving the service life of the fan and the service life of electrical components. In the embodiment of the present invention, no storage battery is provided, reducing costs and improving space utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 is a schematic structural diagram of the control circuit of the fan provided by the embodiment of the present invention;

[0039] Figure 2 is a schematic structural diagram of the control circuit of the fan provided by another embodiment of the present invention;

[0040] Figure 3 is a flowchart of the implementation of the control method of the fan provided by the embodiment of the present invention;

[0041] Figure 4 is a flowchart of the implementation of the control method of the fan provided by another embodiment of the present invention;

[0042] Figure 5 is a flowchart of the implementation of the control method of the fan provided by another embodiment of the present invention;

[0043] Figure 6 is a schematic structural diagram of the control device of the fan provided by the embodiment of the present invention;

[0044] Figure 7 [[ID=##]]is a schematic diagram of the controller provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0046] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will be described through specific embodiments in conjunction with the accompanying drawings.

[0047] In the prior art, a DCDC is combined with a storage battery on a new energy mining truck to synchronously drive a fan for heat dissipation. By connecting a storage battery to the output end of a DC converter, the storage battery is connected to multiple fans to supply power to the fans. Although the energy released by the storage battery can reduce the impact of starting the fan, the synchronous start and stop of the fans still cause a relatively large impact on the circuit, with high energy consumption, easy damage to the power supply, and easy occurrence of circuit interference between electrical components, resulting in poor heat dissipation effect and affecting the vehicle life. Moreover, installing a storage battery on the vehicle will occupy additional space and increase the cost.

[0048] An embodiment of the present invention provides a control circuit for a fan and a corresponding fan control method, which do not require the installation of a storage battery, reduce the space occupancy rate, reduce the cost, and solve the circuit impact caused by the synchronous start and stop of the fans in the prior art, protect electrical components, reduce energy loss, and can achieve a better heat dissipation effect.

[0049] Figure 1 The following is a schematic diagram of a control circuit for a fan provided by an embodiment of the present invention, which is described in detail as follows: The control circuit for a fan may include: a DC converter 1, at least two fans 2, and a vehicle controller 3;

[0050] The DC converter 1 is used to convert a first preset DC voltage in the vehicle into a second preset DC voltage, and the second preset DC voltage is less than the first preset DC voltage; the DC converter 1 provides voltage for the rotation of each fan;

[0051] The first port of each fan 2 is connected to the positive extreme of the output end of the DC converter 1, the second port of each fan 2 is connected to the negative extreme of the output end of the DC converter 1, and the third port of each fan 2 is connected to the corresponding control port of the vehicle controller 3, and is used to start in stages according to the control signal of the vehicle controller 3 for heat dissipation.

[0052] See Figure 1As shown, the DC converter 1, i.e., the DCDC module, converts the high-voltage DC into low-voltage DC. The input end of the DC converter 1 inputs high-voltage DC, and the output end outputs the converted low-voltage DC. In one embodiment, the DC converter 1 can convert 600V DC voltage into 24V low-voltage DC. In this embodiment, the voltages before and after the conversion of the DC converter 1 are not limited, and the above is only for illustrative purposes.

[0053] The output end of the DC converter 1 is respectively connected to four parallel fans 2. The first port of each fan 2 is connected to the positive extreme of the output end of the DC converter 1, the second port is connected to the negative extreme of the output end of the DC converter 1, and the third port is connected to the control signal output end of the vehicle controller 3, so as to start in stages according to the control signal output by the vehicle controller 3 to achieve heat dissipation.

[0054] It can be understood that other numbers of fans can also be set in the control circuit of the fan, such as three, five, etc. The fans can be set according to requirements. The setting of four fans in the above is only for illustrative purposes. Figure 1 Here, the vehicle controller 3 is used to output the fan duty cycle signal to drive the fan to rotate.

[0055] In the control circuit of the above-mentioned fan, the output end of the DCDC module provides the voltage required for each fan to rotate respectively, and then the vehicle controller can control each fan respectively, so as to achieve the staged start of the fan. While achieving heat dissipation, the impact on the circuit is reduced. In addition, the staged start of the fan can also reduce unnecessary energy waste and reduce energy consumption.

[0056] In one embodiment, as shown in

[0057] In the control circuit of the fan, there may also be included: at least two resistors 4, and the number of resistors 4 is the same as the number of fans 2; Figure 2 One end of each resistor 4 is connected between the third port of the corresponding fan 2 and the control signal output end of the vehicle controller 3, and the other end of each resistor 4 is grounded.

[0058] The resistance value of the resistor 4 can be 2kΩ, which is set on the control signal line to maintain the stability during the transmission of the control signal, that is, to maintain the stability of the fan duty cycle signal.

[0059] In one embodiment, as shown in

[0060] In the control circuit of the fan, there may also be included: at least two fuses 5, and the number of fuses 5 is the same as the number of fans; Figure 2 One end of each fuse 5 is connected to the positive extreme of the output end of the DC converter 1, and the other end of each fuse 5 is connected to the first port of the corresponding fan 2.

[0061] ​

[0062] The fuse 5 can be used to transmit a current of 50 A. When the current is greater than 50 A, it will blow and form an open circuit to protect the electrical components in the circuit.

[0063] In the control circuit of the above-mentioned fan, the output terminals of the DCDC module provide the voltage required for each fan to rotate. Then, the vehicle controller can control the start and stop of each fan separately, so as to realize the staged start of the fan. While achieving heat dissipation, it reduces the impact on the circuit. In addition, the staged start of the fan can also reduce unnecessary energy waste and energy consumption.

[0064] The fuse connected in series between the first port of each fan and the positive terminal of the DCDC module in the control circuit of the fan can protect the electrical components in the circuit from being impacted by large currents. In addition, the resistor connected in series between the third port of each fan and the ground can maintain the stability of the divided control signal and realize the stable control of the fan.

[0065] Figure 3 The figure is a flowchart for implementing a control method of a fan provided by an embodiment of the present invention. Using the control circuit of the fan described in any of the above embodiments, with the vehicle controller as the execution subject, the control method of the fan is described in detail as follows:

[0066] Step 301, obtain the temperature of the electrical components on the vehicle in real time.

[0067] Optionally, the electrical components may include: a DC converter, a main drive motor, an auxiliary drive motor, a brake air pump, and a steering pump.

[0068] In one embodiment, obtaining the temperature of the electrical components on the vehicle in real time may include:

[0069] Obtain the temperature of the DC converter, the main drive motor temperature, the auxiliary drive motor temperature, the brake air pump temperature, and the steering pump temperature on the vehicle in real time, and use the temperature of the electrical component with the highest temperature among the temperature of the DC converter, the main drive motor temperature, the auxiliary drive motor temperature, the brake air pump temperature, and the steering pump temperature as the current temperature.

[0070] In this embodiment, we make a temperature judgment based on the temperature of the electrical component with the highest temperature among the above-mentioned electrical components. When the highest temperature of the electrical component meets the first preset condition, the fan is turned on for temperature reduction treatment to reduce the temperature of the electrical component and prevent the electrical component from being damaged due to excessive temperature.

[0071] Step 302, when the temperature meets the first preset condition, turn on any fan that is currently in the off state according to the temperature.

[0072] Optionally, since we judge the temperature based on the highest temperature among the temperatures of electrical components, not all the temperatures of electrical components reach the condition for fan cooling. Therefore, only any one fan is turned on at this time, so as to reduce energy consumption while cooling. Moreover, only turning on any one fan can also reduce the current impact caused by turning on the fan compared with turning on all fans in the prior art, and solve the problem that the synchronous start and stop of the fans easily cause circuit interference between electrical components.

[0073] In one embodiment, referring to Figure 4 as shown, when the temperature meets the first preset condition, turning on any one of the currently off fans according to the temperature may include:

[0074] If the current temperature is greater than the temperature threshold, determine the fan start-up speed according to the current temperature;

[0075] Determine the corresponding fan start-up duty cycle according to the fan start-up speed;

[0076] Control any one of the currently off fans to start rotating at the fan start-up duty cycle, and increase the fan start-up duty cycle to the preset duty cycle.

[0077] Figure 4 For the convenience of description, the step of detecting whether the current temperature is greater than the temperature threshold is also added.

[0078] Here, the temperature threshold can be set according to requirements or experience. In this embodiment, the value of the temperature threshold is not limited. For example, the temperature threshold can be set to 40°C, 45°C, etc.

[0079] Optionally, when determining the fan start-up speed according to the current temperature, the fan start-up speed corresponding to the current temperature can be queried in the first temperature-speed table. It should be noted that the first temperature-speed table includes the temperature and the fan start-up speed corresponding to the temperature, and the first temperature-speed table can be obtained through calibration.

[0080] In order to more quickly reduce the temperature of the electrical components on the basis of reducing energy consumption, when the temperature of the electrical components is less than the preset temperature, for example, when the temperature of the electrical components is less than 80°C, when the current temperature increases from 40°C to 80°C, the growth rate of the corresponding fan start-up speed is less than when the current temperature increases from 80°C to 100°C, the growth rate of the corresponding fan start-up speed.

[0081] Optionally, the size of the duty cycle determines the speed of the fan. Generally, when the duty cycle is 0, the fan does not rotate, and when the duty cycle is 100, the fan reaches the maximum speed. In this embodiment, the maximum speed of the fan can be obtained from the factory data of the fan, and then the corresponding relationship between the speed of the fan and the duty cycle can be obtained. Furthermore, the corresponding fan start-up duty cycle can be determined according to the fan start-up speed.

[0082] It should be noted that since there is a certain reverse rotation when the fan starts to rotate, in this embodiment, when the rotational speed of the fan is limited to 0, the corresponding duty cycle is a preset duty cycle. For example, the preset duty cycle can take values such as 3 or 4. Therefore, the duty cycle ranges from 3 or 4 to 100, corresponding to the fan rotational speed ranging from 0 to the maximum rotational speed.

[0083] Optionally, increase the fan turn-on duty cycle to the preset duty cycle, where the preset duty cycle is greater than the fan turn-on duty cycle. Therefore, in this embodiment, control the fan to slowly increase from the fan turn-on rotational speed to a certain rotational speed, and the wind speed slowly increases, which can reduce the current required when the fan is turned on, thereby further reducing the current impact.

[0084] In order to determine the maximum rotational speed that the fan can reach, in one embodiment, refer to Figure 4 As shown, after determining the fan turn-on rotational speed according to the current temperature, it may further include:

[0085] Determine the fan target rotational speed according to the current temperature;

[0086] Determine the corresponding fan target duty cycle according to the fan target rotational speed;

[0087] Increasing the fan turn-on duty cycle to the preset duty cycle includes:

[0088] Control the fan turn-on duty cycle to increase to the fan target duty cycle.

[0089] Optionally, when determining the fan target rotational speed according to the current temperature, the fan target rotational speed corresponding to the current temperature can be queried in the second temperature-rotational speed table. It should be noted that the second temperature-rotational speed table includes the temperature and the fan target rotational speed corresponding to the temperature, and the second temperature-rotational speed table can be obtained through calibration.

[0090] Here, the fan turn-on rotational speed is less than the fan target rotational speed. In this embodiment, the fan slowly increases from the fan turn-on rotational speed to the fan target rotational speed, and the wind speed slowly increases, which can reduce the current required when the fan is turned on, thereby further reducing the current impact.

[0091] The fan target rotational speed can be calibrated through the fan turn-on rotational speed. For example, multiply the fan turn-on rotational speed by the rotational speed coefficient, where the rotational speed coefficient is calibrated according to the highest temperature of the electrical component. The higher the highest temperature of the electrical component, the larger the rotational speed coefficient.

[0092] In one embodiment, refer to Figure 4 As shown, it may further include:

[0093] If the current temperature is not greater than the temperature threshold, do not turn on the fan that is currently in the off state, and jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" for execution;

[0094] Alternatively, if the current temperature is not greater than the temperature threshold, turn off the fan with the shortest on-time and jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" for execution.

[0095] Here, if it is determined at the beginning of the process that the current temperature is not greater than the temperature threshold, there is no need to use a fan to cool the electrical components, so the fan that is currently in the off state is not turned on.

[0096] If one or more fans have been turned on, when it is determined that the current temperature is not greater than the temperature threshold, it means that there is no need to turn on a new fan and the temperature has already dropped. To reduce energy consumption, the fan with the shortest on-time, that is, the most recently turned-on fan, can also be turned off.

[0097] Step 303, if the rotation speed of the fan meets the second preset condition, jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" for execution until the vehicle is powered off.

[0098] In one embodiment, as shown in Figure 4 When the rotation speed of the fan meets the second preset condition and jumps to the step of "real-time obtaining the temperature of the electrical components on the vehicle" for execution, it may include:

[0099] If the rotation speed of the fan is the target rotation speed of the fan, and after reaching the preset time for the target rotation speed of the fan, jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" for execution.

[0100] Here, the preset time can be set according to requirements or experience. The purpose is to let the current temperature stabilize before re-measuring the temperature, so as to more accurately control the start and stop of the fan. For example, the preset time can be 1 s or 2 s, etc.

[0101] As shown in Figure 5 In contrast to Figure 1 or Figure 2 the control circuit of the fan shown in

[0102] When four fans are set, obtain the temperature of the electrical components on the vehicle in real time, and use the temperature of the electrical component with the highest temperature among the electrical components as the first current temperature;

[0103] Then detect whether the first current temperature is greater than the temperature threshold;

[0104] If the first current temperature is greater than the temperature threshold, turn on Fan 1 and control the speed of Fan 1 to slowly increase to the target fan speed. After the speed of Fan 1 reaches the target fan speed for 1 s, obtain the temperature of the electrical components on the vehicle in real time, and use the temperature of the electrical component with the highest temperature among the electrical components as the second current temperature;

[0105] If the second current temperature is not greater than the temperature threshold, turn off Fan 1. Therefore, it is necessary to re-determine whether to turn on Fan 1, so jump to the previous step of "obtaining the temperature of the electrical components on the vehicle in real time" to execute;

[0106] If the second current temperature is greater than the temperature threshold, turn on Fan 2 and control the speed of Fan 2 to slowly increase to the target fan speed. After the speed of Fan 2 reaches the target fan speed for 1 s, obtain the temperature of the electrical components on the vehicle in real time, and use the temperature of the electrical component with the highest temperature among the electrical components as the third current temperature;

[0107] If the third current temperature is not greater than the temperature threshold, turn off Fan 2. Therefore, it is necessary to re-determine whether to turn on Fan 2, so jump to the previous step of "obtaining the temperature of the electrical components on the vehicle in real time" to execute;

[0108] If the third current temperature is greater than the temperature threshold, turn on Fan 3 and control the speed of Fan 3 to slowly increase to the target fan speed. After the speed of Fan 3 reaches the target fan speed for 1 s, obtain the temperature of the electrical components on the vehicle in real time, and use the temperature of the electrical component with the highest temperature among the electrical components as the fourth current temperature;

[0109] If the fourth current temperature is not greater than the temperature threshold, turn off Fan 3. Therefore, it is necessary to re-determine whether to turn on Fan 3, so jump to the previous step of "obtaining the temperature of the electrical components on the vehicle in real time" to execute;

[0110] If the fourth current temperature is greater than the temperature threshold, turn on Fan 4 and control the speed of Fan 4 to slowly increase to the target fan speed. After the speed of Fan 4 reaches the target fan speed for 1 s, obtain the temperature of the electrical components on the vehicle in real time, and use the temperature of the electrical component with the highest temperature among the electrical components as the fifth current temperature;

[0111] If the fifth current temperature is not greater than the temperature threshold, turn off Fan 4. Therefore, it is necessary to re-determine whether to turn on Fan 4, so jump to the previous step of "obtaining the temperature of the electrical components on the vehicle in real time" to execute;

[0112] If the fifth current temperature is greater than the temperature threshold, keep the current on state of each fan and jump to the nearest step of "real-time obtaining the temperature of electrical components on the vehicle" for execution until the vehicle is powered off. It should be noted that the fifth current temperature will not always be greater than the temperature threshold. If this situation occurs, it means that the calibrated fan speed is incorrect and the fan speed needs to be recalibrated.

[0113] In the embodiment of the present invention, the temperature of electrical components on the vehicle is obtained in real time; when the temperature meets the first preset condition, any fan that is currently in the off state is turned on according to the temperature; if the rotation speed of the fan meets the second preset condition, jump to the step of "real-time obtaining the temperature of electrical components on the vehicle" for execution until the vehicle is powered off, so as to realize starting different fans in stages according to the temperature of electrical components, while ensuring the cooling effect, reducing the impact of the fan starting current on the circuit, reducing the energy consumption of the fan, reducing the damage to the fan caused by frequently starting and stopping the fan simultaneously according to the temperature in the prior art, and the circuit interference between electrical components, improving the fan life and the life of electrical components.

[0114] In addition, in the embodiment of the present invention, there is no need to set a storage battery, so that the hardware cost can be reduced and the space utilization rate can be improved.

[0115] Finally, in the embodiment of the present invention, the fan is controlled to slowly increase the rotation speed from the fan starting rotation speed to the target rotation speed, and the wind speed is slowly increased, which can reduce the current required when the fan is started, so as to further reduce the current impact.

[0116] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0117] The following is the device embodiment of the present invention. For the details not described in detail, reference can be made to the corresponding method embodiments above.

[0118] Figure 6 The structural schematic diagram of the fan control device provided by the embodiment of the present invention is shown. For the convenience of description, only the parts related to the embodiment of the present invention are shown. The fan control circuit of any of the above embodiments is adopted in the fan control device, and the details are as follows:

[0119] As Figure 6 shown, the fan control device 6 includes: an acquisition module 61 and a control module 62.

[0120] The acquisition module 61 is used to obtain the temperature of electrical components on the vehicle in real time;

[0121] The control module 62 is configured to turn on any fan that is currently in the off state according to the temperature when the temperature meets the first preset condition;

[0122] If the rotation speed of the fan meets the second preset condition, jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" and execute until the vehicle is powered off.

[0123] In a possible implementation, when the acquisition module 61 acquires the temperature of the electrical components on the vehicle in real time, it is used for:

[0124] Acquire the temperature of the DC converter, the main drive motor temperature, the auxiliary drive motor temperature, the brake air pump temperature, and the steering pump temperature on the vehicle in real time, and use the temperature of the electrical component with the highest temperature among the DC converter temperature, the main drive motor temperature, the auxiliary drive motor temperature, the brake air pump temperature, and the steering pump temperature as the current temperature.

[0125] In a possible implementation, when the temperature meets the first preset condition and the control module 62 turns on any fan that is currently in the off state according to the temperature, it is used for:

[0126] When the current temperature is greater than the temperature threshold, determine the fan start rotation speed according to the current temperature;

[0127] Determine the corresponding fan start duty cycle according to the fan start rotation speed;

[0128] Control any fan that is currently in the off state to start rotating at the fan start duty cycle, and increase the fan start duty cycle to the preset duty cycle.

[0129] In a possible implementation, after the control module 62 determines the fan start rotation speed according to the current temperature, it is further used for:

[0130] Determine the fan target rotation speed according to the current temperature;

[0131] Determine the corresponding fan target duty cycle according to the fan target rotation speed;

[0132] When the control module 62 increases the fan start duty cycle to the preset duty cycle, it is used for:

[0133] Control the fan start duty cycle to increase to the fan target duty cycle.

[0134] In a possible implementation, the control module 62 is further used for:

[0135] If the current temperature is not greater than the temperature threshold, do not turn on the fan that is currently in the off state, or turn off the fan with the shortest on time, and jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" and execute.

[0136] In a possible implementation, when the rotation speed of the fan satisfies the second preset condition, the control module 62 controls to jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" and execute until the vehicle is powered off, for:

[0137] If the rotation speed of the fan is the target rotation speed of the fan, and after reaching the preset time of the target rotation speed of the fan, jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" and execute.

[0138] The above-mentioned fan control device obtains the temperature of the electrical components on the vehicle in real time through the acquisition module; when the temperature satisfies the first preset condition, the control module turns on any fan that is currently in the off state according to the temperature, and if the rotation speed of the fan satisfies the second preset condition, it jumps to the step of "real-time obtaining the temperature of the electrical components on the vehicle" and executes until the vehicle is powered off, so as to realize starting different fans in stages according to the temperature of the electrical components, while ensuring the cooling effect, reducing the impact of the fan starting current on the circuit, reducing the energy consumption of the fan, reducing the damage to the fan caused by frequently starting and stopping the fan simultaneously according to the temperature in the prior art, and the circuit interference between electrical components, improving the service life of the fan and the service life of electrical components.

[0139] In addition, in the embodiment of the present invention, the fan is controlled to slowly increase from the fan start rotation speed to the target rotation speed, and the wind speed slowly increases, which can reduce the current required when the fan is started, and further reduce the current impact.

[0140] The embodiment of the present invention provides a controller, such as a vehicle controller, Figure 7 which is a schematic diagram of the controller provided by the embodiment of the present invention. As Figure 7 shown, the controller 7 of this embodiment includes: a processor 70, a memory 71, and a computer program 72 stored in the memory 71 and operable on the processor 70. When the processor 70 executes the computer program 72, it realizes the steps in the above-mentioned embodiments of the control method of each fan, such as Figure 1 the steps 101 to 103 shown. Or, when the processor 70 executes the computer program 72, it realizes the functions of each module / unit in the above-mentioned device embodiments, such as Figure 6 the functions of each module / unit shown.

[0141] Exemplarily, the computer program 72 can be divided into one or more modules / units. The one or more modules / units are stored in the memory 71 and executed by the processor 70 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program 72 in the controller 7. For example, the computer program 72 can be divided into Figure 6Each of the modules / units shown.

[0142] The controller 7 may include, but is not limited to, a processor 70 and a memory 71. Those skilled in the art can understand that Figure 7 These are merely examples of the controller 7 and do not constitute a limitation on the controller 7. It may include more or fewer components than shown, or combine certain components, or have different components. For example, the controller may also include input / output devices, network access devices, buses, etc.

[0143] The so-called processor 70 may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0144] The memory 71 may be an internal storage unit of the controller 7, such as the hard disk or memory of the controller 7. The memory 71 may also be an external storage device of the controller 7, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on the controller 7. Further, the memory 71 may also include both the internal storage unit and the external storage device of the controller 7. The memory 71 is used to store the computer program and other programs and data required by the controller 7. The memory 71 may also be used to temporarily store data that has been output or is to be output.

[0145] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional units and modules according to needs, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiments can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0146] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0147] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in the form of hardware or software depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0148] In the embodiments provided by the present invention, it should be understood that the disclosed device / controller and method can be implemented in other ways. For example, the device / controller embodiments described above are only illustrative. For example, the division of the above-mentioned module or unit 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 system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be in an electrical, mechanical or other form.

[0149] The unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0150] In addition, in each embodiment of the present invention, each functional unit can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0151] If the above-mentioned integrated module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the processes in the above-mentioned embodiment methods of the present invention, it can also be completed by a computer program instructing relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above-mentioned control method embodiments of each fan can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0152] An embodiment of the present invention provides a vehicle, including the controller provided in any of the above embodiments, and having the beneficial effects brought by the controller provided in any of the above embodiments.

[0153] The above-mentioned embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A control circuit of a fan, characterized in that, Including: A DC converter, at least two fans, and a vehicle controller; The DC converter is used to convert a first preset DC voltage in the vehicle into a second preset DC voltage, and the second preset DC voltage is less than the first preset DC voltage; The first port of each fan is connected to the positive terminal of the output end of the DC converter, the second port of each fan is connected to the negative terminal of the output end of the DC converter, and the third port of each fan is correspondingly connected to the control signal output end of the vehicle controller, and is used to start in stages according to the control signal output by the vehicle controller for heat dissipation.

2. The control circuit of the fan according to claim 1, wherein, Further including: At least two resistors, and the number of resistors is the same as the number of fans; One end of each resistor is connected between the third port of the corresponding fan and the corresponding control port of the vehicle controller, and the other end of each resistor is grounded.

3. The control circuit of the fan according to claim 1 or 2, characterized in that, Further including: At least two fuses, and the number of fuses is the same as the number of fans; One end of each fuse is connected to the positive terminal of the output end of the DC converter, and the other end of each fuse is connected to the first port of the corresponding fan.

4. A control method for a fan, characterized in that, Using the control circuit of the fan described in any one of the above claims 1-3, the control method of the fan includes: Obtaining the temperature of the electrical components on the vehicle in real time; When the temperature meets the first preset condition, turn on any one of the fans that is currently in the off state according to the temperature; If the rotation speed of the fan meets the second preset condition, jump to the step of "obtaining the temperature of the electrical components on the vehicle in real time" to execute until the vehicle is powered off.

5. The control method of the fan according to claim 4, characterized in that, The obtaining the temperature of the electrical components on the vehicle in real time includes: Obtaining the temperature of the DC converter on the vehicle, the main drive motor temperature, the auxiliary drive motor temperature, the brake air pump temperature, and the steering pump temperature in real time, and using the temperature of the electrical component with the highest temperature among the temperature of the DC converter, the main drive motor temperature, the auxiliary drive motor temperature, the brake air pump temperature, and the steering pump temperature as the current temperature.

6. The control method of the fan according to claim 5, characterized in that When the temperature meets the first preset condition, turning on any one of the fans that is currently in the off state according to the temperature includes: When the current temperature is greater than the temperature threshold, determining the fan start rotation speed according to the current temperature; Determining the corresponding fan start duty ratio according to the fan start rotation speed; Controlling any one of the fans that is currently in the off state to start rotating at the fan start duty ratio, and increasing the fan start duty ratio to a preset duty ratio.

7. The control method of the fan according to claim 6, wherein, After determining the fan start rotation speed according to the current temperature, further including: Determining the fan target rotation speed according to the current temperature; Determining the corresponding fan target duty ratio according to the fan target rotation speed; Increasing the fan start duty ratio to a preset duty ratio includes: Controlling the fan start duty ratio to increase to the fan target duty ratio.

8. The control method of the fan according to claim 6, characterized in that, Further including: If the current temperature is not greater than the temperature threshold, do not turn on the fan that is currently in the off state, or turn off the fan with the shortest start time, and jump to the step of "obtaining the temperature of the electrical components on the vehicle in real time" to execute.

9. The control method of the fan according to claim 7, characterized in that, If the rotation speed of the fan meets the second preset condition, jumping to the step of "obtaining the temperature of the electrical components on the vehicle in real time" to execute includes: If the rotational speed of the fan is the target rotational speed of the fan, and after a preset time for reaching the target rotational speed of the fan, it jumps to the step of "real-time obtaining the temperature of the electrical components on the vehicle" for execution.

10. A control device for a fan, characterized in that, Using the control circuit of the fan according to any one of the above claims 1-3, the control device of the fan includes: An acquisition module, configured to acquire the temperature of the electrical components on the vehicle in real time; A control module, configured to turn on any one of the fans that is currently in the off state according to the temperature when the temperature meets a first preset condition; The control module is further configured to, if the rotational speed of the fan meets a second preset condition, jump to the step of "real-time obtaining the temperature of the electrical components on the vehicle" for execution until the vehicle is powered off.

Images