Control method, device and equipment for automobile electronic fan and storage medium

Abstract

The invention discloses a control method, device and equipment for an automobile electronic fan and a storage medium, and the method comprises the steps that when a starting signal of the electronic fan is received, the rotating direction and the rotating speed of the electronic fan are obtained; if the rotation direction of the electronic fan is negative, whether the rotation speed of the electronic fan is lower than a preset first negative value or not is judged; when the value is lower than the first negative value, the starting signal is not responded; and when the phase current is not lower than the first negative value, the electronic fan is braked, the braked electronic fan is dragged in an open-loop mode to operate forwards under the condition that the phase current is smaller than the peak working condition current, and after the rotating speed of the electronic fan is increased to a first positive value, the starting signal is responded to operate the electronic fan in a closed-loop mode. When the reverse rotation speed is small, the electronic fan is dragged to rotate by proper current after the fan is actively braked and stopped, the electronic fan is accelerated to the proper forward rotation speed and then is connected to the whole vehicle circuit in a closed loop mode, the jump degree of voltage and current of the electronic fan can be effectively reduced, and circuit hidden dangers existing when the electronic fan is directly connected to the whole vehicle circuit in a closed loop mode at the zero rotation speed are avoided.

Description

Technical Field

[0001] The present application relates to the field of automotive electronic fan electronic control technology, and specifically to a control method, device, equipment and storage medium for an automotive electronic fan. Background Art

[0002] The automotive electronic fan is an important component of the thermal management system of new energy vehicles. If the electronic fan stops or stalls due to control problems, it will cause the vehicle's motor or battery system to overheat and the vehicle will be unable to drive. When the fan is at a low speed and the vehicle is in complex working conditions such as headwind and tailwind, especially in headwind conditions, when the fan is blown in reverse, if the reverse speed is too high and the fan is directly started according to the current strategy request, the motor inside the fan will generate a large peak impact current, resulting in a very large ripple current flowing through the capacitor in the circuit, which is prone to overcurrent faults and even circuit capacitor burnout. Summary of the invention

[0003] The present application provides a control method, device, equipment and storage medium for an automotive electronic fan, which can solve the technical problems existing in the above-mentioned prior art.

[0004] In a first aspect, an embodiment of the present application provides a method for controlling an automotive electronic fan, which adopts the following technical solution:

[0005] A method for controlling an automotive electronic fan, the method comprising:

[0006] When receiving a start signal of the electronic fan, obtaining the rotation direction and speed of the electronic fan;

[0007] If the rotation direction of the electronic fan is negative, determining whether the rotation speed of the electronic fan is lower than a preset first negative value;

[0008] When the value is lower than the first negative value, the start signal is not responded;

[0009] When the speed is not lower than the first negative value, the electronic fan is braked, and the braked electronic fan is driven forward in an open loop under the condition that the phase current is less than the peak operating current, and after the speed of the electronic fan is increased to the first positive value, the electronic fan is operated in a closed loop in response to the start signal.

[0010] In combination with the first aspect, in one implementation, when the electronic fan is running in the forward direction and the phase current is less than the peak operating current,

[0011] The electronic fan stopped by open-loop drag braking runs forward under the condition that the phase current is within the set current range; wherein the set current range is smaller than the peak operating current.

[0012] In combination with the first aspect, in one implementation, the electronic fan stopped by open-loop drag braking runs forward under the condition that the phase current is within a preset standard current range, comprising the following steps:

[0013] Driving the braked electronic fan in an open loop with a preset initial voltage, and obtaining the phase current of the electronic fan under the initial voltage;

[0014] Determining whether the phase current of the electronic fan is within a set current range;

[0015] If not, adjust the voltage applied to the electronic fan until the phase current is within the set current range.

[0016] In combination with the first aspect, in one embodiment, before the electronic fan is braked to a stop in an open loop with a preset initial voltage, the following steps are included:

[0017] The motor rotor of the electronic fan is controlled to move to the initial zero position.

[0018] In combination with the first aspect, in one implementation, when a start signal of the electronic fan is received, the rotation direction and speed of the electronic fan are obtained.

[0019] If the rotation direction of the electronic fan is positive, determine whether the rotation speed of the electronic fan is greater than a preset second positive value; wherein the second positive value is not less than the first positive value;

[0020] When it is less than the second positive value, the electronic fan that is stopped by open-loop dragging is operated forward under the condition that the phase current is less than the peak operating current, and after the speed of the electronic fan is increased to the first positive value, the electronic fan is operated in a closed loop in response to the start signal.

[0021] In combination with the first aspect, in one implementation, if the rotation direction of the electronic fan is positive, after determining whether the rotation speed of the electronic fan is greater than a preset second positive value, the method further includes the following steps:

[0022] When the speed is greater than the second positive value, obtaining a required duty cycle speed of the electronic fan determined based on the vehicle operating parameters, and determining whether the speed of the electronic fan is greater than the required duty cycle speed;

[0023] If the rotation speed of the electronic fan is less than the required duty cycle rotation speed, the electronic fan is operated in a closed loop in response to the start signal.

[0024] In combination with the first aspect, in one implementation, when the speed is greater than the second positive value, obtaining the required duty cycle speed of the electronic fan determined based on the vehicle operating parameters, and determining whether the speed of the electronic fan is greater than the requested speed, the following steps are included:

[0025] If the speed of the electronic fan is greater than the requested duty cycle speed, the start signal is not responded to and a fault signal of the electronic fan is not reported.

[0026] In a second aspect, the embodiment of the present application provides a control device for an automotive electronic fan, which adopts the following technical solution:

[0027] A control device for an automotive electronic fan, the device comprising:

[0028] An acquisition module, configured to acquire the rotation direction and speed of the electronic fan when receiving a start signal of the electronic fan;

[0029] A control module is configured to determine whether the rotation speed of the electronic fan is lower than a preset first negative value if the rotation direction of the electronic fan is negative; when it is lower than the first negative value, not respond to the start signal; when it is not lower than the first negative value, stop the electronic fan, open-loop drag the stopped electronic fan to run forward under the condition that the phase current is less than the peak operating current, and after the rotation speed of the electronic fan is increased to the first positive value, respond to the start signal to operate the electronic fan in a closed loop.

[0030] In a third aspect, the embodiment of the present application provides a control device for an automotive electronic fan, which adopts the following technical solution:

[0031] A control device for an automobile electronic fan, comprising a processor, a memory, and a control program for the automobile electronic fan stored in the memory and executable by the processor, wherein when the control program for the automobile electronic fan is executed by the processor, the steps of the control method for the automobile electronic fan as described above are implemented.

[0032] In a fourth aspect, an embodiment of the present application provides a storage medium, which adopts the following technical solution:

[0033] A storage medium stores a control program for an automobile electronic fan, wherein when the control program for the automobile electronic fan is executed by a processor, the steps of the control method for the automobile electronic fan as described above are implemented.

[0034] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0035] After receiving the start signal of the electronic fan, it is determined whether the electronic fan is in a reverse state before starting the electronic fan in a closed loop, and when in the reverse state, it is determined whether its speed is too high. When the reverse speed is too high, the start signal is not responded to, thereby avoiding the closed-loop start of the electronic fan at this time, causing the internal motor of the fan to generate a large peak impact current to damage the circuit structure. When the reverse speed is low, the fan is actively stopped by braking, and then the electronic fan is dragged to rotate with a suitable current and accelerated to a suitable forward speed. When the electronic fan reaches a suitable forward speed, it is closed-loop connected to the vehicle circuit to effectively reduce the degree of voltage and current jumps of the electronic fan, avoiding circuit hazards that exist when the zero speed is directly closed-loop connected to the vehicle circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flow chart of an embodiment of a method for controlling an automotive electronic fan of the present application;

[0037] Figure 2 This is a functional module diagram of an embodiment of a control device for an automotive electronic fan of the present application;

[0038] Figure 3 This is a schematic diagram of the hardware structure of the control device of the automotive electronic fan involved in the embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] The automotive electronic fan is an important component of the thermal management system of new energy vehicles. If the electronic fan stops or stalls due to control problems, it will cause the vehicle's motor or battery system to overheat and the vehicle will be unable to drive. When the fan is at a low speed and the vehicle is in complex working conditions such as headwind and tailwind, especially in headwind conditions, when the fan is blown in reverse, if the reverse speed is too high and the fan is directly started according to the current strategy request, the motor inside the fan will generate a large peak impact current, resulting in a very large ripple current flowing through the capacitor in the circuit, which is prone to overcurrent faults and even circuit capacitor burnout.

[0041] Based on the above problems, the present application provides a control method, device, equipment and storage medium for an automotive electronic fan. The main point of the invention is that after receiving the start signal of the electronic fan, before the closed-loop start of the electronic fan, it is determined whether it is in a reverse state, and when it is in a reverse state, it is determined whether its speed is too large. When the reverse speed is too large, it does not respond to the start signal, thereby avoiding the closed-loop start of the electronic fan at this time, causing the motor inside the fan to generate a large peak impact current to damage the circuit structure. When the reverse speed is small, after actively stopping the fan, the electronic fan is dragged to rotate with a suitable current and speeded up to a suitable forward speed. In this process, since the initial state of the electronic fan is stationary, the back electromotive force of its motor will be zero. At this time, a relatively small voltage can be applied to drive the electronic fan to rotate forward, thereby ensuring that the electronic fan can be smoothly dragged to rotate with a small current. When the electronic fan reaches a suitable forward speed, it is closed-loop connected to the vehicle circuit to effectively reduce the jump degree of the voltage and current of the electronic fan, avoiding the circuit hidden dangers when the zero speed is directly closed-loop connected to the vehicle circuit.

[0042] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0043] In a first aspect, an embodiment of the present application provides a method for controlling an automotive electronic fan.

[0044] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the control method of the automotive electronic fan of the present application. Figure 1 As shown, the control method of the automotive electronic fan includes:

[0045] S100, when receiving a start signal of the electronic fan, obtaining the rotation direction and speed of the electronic fan;

[0046] S200, if the rotation direction of the electronic fan is negative, determine whether the rotation speed of the electronic fan is lower than a preset first negative value;

[0047] S310, when the value is lower than the first negative value, not responding to the start signal;

[0048] S320, when the current is not less than the first negative value, the electronic fan is stopped, and the stopped electronic fan is dragged in an open loop to run forward under the condition that the phase current is less than the peak operating current, and after the speed of the electronic fan is increased to the first positive value, the electronic fan is operated in a closed loop in response to the start signal.

[0049] In this embodiment, by judging that the electronic fan has reversed before starting, a specific control strategy will be selected according to the specific size of the reverse speed. When the reverse speed is too large, that is, the speed is less than the first negative value, the start signal will not be responded to, so as to avoid the need to apply too large a voltage to drive the electronic fan to rotate forward at this time, resulting in excessive current and damage to the circuit structure. When the reverse speed is small, that is, the speed is greater than the first negative value, there is a possibility of starting the electronic fan. At this time, the rotation of the electronic fan is further stopped first, and then the speed of the electronic fan is increased to the first positive value before connecting the vehicle circuit with a phase current within a suitable range, so that it can smoothly perform closed-loop operation after connecting to the vehicle circuit, effectively realize the transition change of the voltage and current of the electronic fan, and ensure the stability of the circuit structure. In this process, since the initial state of the electronic fan is stationary, the back electromotive force of its motor will be zero. At this time, applying a relatively small voltage can drive the electronic fan to rotate forward, that is, it can ensure that the electronic fan can be smoothly dragged to rotate with a current within a suitable range. Among them, it can be understood that the size of the first positive value should be less than the required speed when the electronic fan is connected to the closed-loop operation of the vehicle circuit.

[0050] Further, in one embodiment, during the execution of step S320, when the phase current is less than the peak operating current, the electronic fan stopped by open-loop dragging is in the forward running process,

[0051] The electronic fan stopped by open-loop drag braking runs forward under the condition that the phase current is within the set current range; wherein the set current range is smaller than the peak operating current.

[0052] This arrangement enables the electronic fan to be operated within a set current range that is more beneficial to circuit stability before being connected to the vehicle circuit for closed-loop operation. Specifically, in this embodiment, step S320 includes the following steps:

[0053] S321, open-loop dragging of the braked electronic fan with a preset initial voltage, and obtaining the phase current of the electronic fan under the initial voltage;

[0054] S322, determining whether the phase current of the electronic fan is within a set current range;

[0055] S323: If not, adjust the voltage applied to the electronic fan until the phase current is within the set current range.

[0056] In this embodiment, by observing the phase current brought by the voltage applied to the electronic fan in the electronic fan, it is judged whether the currently applied voltage is appropriate. When the phase current exceeds the set current range, the voltage of the electronic fan is reduced, and vice versa. Ultimately, it is achieved to smoothly ensure that the electronic fan can run smoothly and stably in the speed-up stage before the closed-loop operation.

[0057] Furthermore, in some embodiments, before the step S321, open-loop dragging of the braked electronic fan with a preset initial voltage, comprises the following steps:

[0058] S3201, control the motor rotor of the electronic fan to move to an initial zero position.

[0059] In this embodiment, by first moving the motor rotor of the electronic fan to the initial zero position and then performing subsequent control, it is possible to more accurately detect the relevant voltage and current after the motor rotor is zero-position calibrated, thereby ensuring that the subsequent voltage control process proceeds smoothly.

[0060] Further, in some embodiments, after the S100, when receiving the start signal of the electronic fan, obtaining the rotation direction and speed of the electronic fan, comprises the following steps:

[0061] S210, if the rotation direction of the electronic fan is positive, determine whether the rotation speed of the electronic fan is greater than a preset second positive value; wherein the second positive value is not less than the first positive value;

[0062] S220. When the speed is less than the second positive value, the electronic fan that is stopped by open-loop dragging is operated forward under the condition that the phase current is less than the peak operating current, and after the speed of the electronic fan is increased to the first positive value, the electronic fan is operated in a closed loop in response to the start signal.

[0063] Specifically, when the electronic fan has a certain degree of forward speed due to the influence of headwind before starting, it will be further determined whether the forward speed is less than a second positive value. When it is less than the second positive value, it means that the forward speed of the electronic fan at this time is relatively small. If it is directly operated in a closed loop and connected to the vehicle circuit, there is still a certain risk. Therefore, in this case, it is chosen to use a phase current less than the peak operating current to open-loop drag the braked electronic fan to run forward, and after the speed of the electronic fan is increased to the first positive value, the electronic fan is operated in a closed loop in response to the start signal.

[0064] In this process, although the speed is not directly increased to the second positive value, since the speed is formed according to the applied voltage and current, rather than the speed before the voltage and current are applied, when it is connected to the closed-loop operation of the vehicle circuit in this state, the jump degree of voltage and current is relatively smaller, making the risk smaller and enabling closed-loop operation. In addition, in some embodiments, the second positive value can be equal to the first positive value, further eliminating the adverse effects of voltage and current jumps.

[0065] Furthermore, in one embodiment, after the step S210, if the rotation direction of the electronic fan is positive, determining whether the rotation speed of the electronic fan is greater than a preset second positive value, further comprises the following steps:

[0066] S230, when it is greater than the second positive value, obtaining a required duty cycle speed of the electronic fan determined based on the vehicle operating parameters, and determining whether the speed of the electronic fan is greater than the required duty cycle speed;

[0067] S231: If the rotation speed of the electronic fan is less than the required duty cycle rotation speed, operate the electronic fan in a closed loop in response to the start signal.

[0068] In the present embodiment, when the electronic fan is affected by the headwind and has a forward speed greater than the second positive value, but less than the duty cycle speed required for the electronic fan to match the current vehicle air-conditioning operation, closed-loop operation is still required to connect to the vehicle circuit to speed up. However, since its forward speed is already relatively high, the speed-up demand is relatively low. Even if the closed-loop operation is directly connected to the vehicle circuit, the impact current is relatively small. Therefore, in this scenario, the electronic fan is directly operated in a closed loop.

[0069] In addition, in some embodiments, it also includes:

[0070] S240, when the speed is greater than the second positive value, obtaining the required duty cycle speed of the electronic fan determined based on the vehicle operating parameters, and determining whether the speed of the electronic fan is greater than the requested speed, comprising the following steps:

[0071] S241: If the speed of the electronic fan is greater than the requested duty cycle speed, do not respond to the start signal and do not report a fault signal of the electronic fan.

[0072] In the present embodiment, when the forward speed of the electronic fan affected by the headwind exceeds the duty cycle speed required for the electronic fan to match the current vehicle air-conditioning operation, if closed-loop operation is performed, an abnormally low-level signal will appear, and the entire vehicle will determine that the fan has stalled. Therefore, in order to avoid this situation, it will be chosen not to respond to the start signal, that is, the electronic fan will not be started, and the wind speed brought by the headwind can meet the wind speed requirement of the entire vehicle for the electronic fan.

[0073] Ultimately, through the above solution, it is possible to ensure that the electronic fan can use appropriate strategies to determine whether closed-loop operation is required in both headwind and headwind conditions, and to use more appropriate transition measures when closed-loop operation is required or to directly implement closed-loop operation to ensure that the circuit structure has high safety.

[0074] In a second aspect, an embodiment of the present application further provides a control device for an automotive electronic fan.

[0075] In one embodiment, referring to Figure 2 , Figure 2 This is a functional module diagram of an embodiment of a control device for an automotive electronic fan of the present application. Figure 2As shown, the control device of the automotive electronic fan includes:

[0076] An acquisition module, configured to acquire the rotation direction and speed of the electronic fan when receiving a start signal of the electronic fan;

[0077] A control module is configured to determine whether the rotation speed of the electronic fan is lower than a preset first negative value if the rotation direction of the electronic fan is negative; when it is lower than the first negative value, not respond to the start signal; when it is not lower than the first negative value, stop the electronic fan, open-loop drag the stopped electronic fan to run forward under the condition that the phase current is less than the peak operating current, and after the rotation speed of the electronic fan is increased to the first positive value, respond to the start signal to operate the electronic fan in a closed loop.

[0078] Furthermore, in one embodiment, the control module is configured to, when the electronic fan is in forward operation and is stopped by open-loop drag braking under the condition that the phase current is less than the peak operating current,

[0079] The electronic fan stopped by open-loop drag braking runs forward under the condition that the phase current is within the set current range; wherein the set current range is smaller than the peak operating current.

[0080] Further, in one embodiment, the control module is configured to perform the following steps when the electronic fan is running forward with the open-loop drag brake when the phase current is within a preset standard current range:

[0081] Driving the braked electronic fan in an open loop with a preset initial voltage, and obtaining the phase current of the electronic fan under the initial voltage;

[0082] Determining whether the phase current of the electronic fan is within a set current range;

[0083] If not, adjust the voltage applied to the electronic fan until the phase current is within the set current range.

[0084] Furthermore, in one embodiment, the control module is configured to perform the following steps before executing the open-loop drag braking of the electronic fan at a preset initial voltage:

[0085] The motor rotor of the electronic fan is controlled to move to the initial zero position.

[0086] Furthermore, in one embodiment, the control module is configured to, after receiving the start signal of the electronic fan and obtaining the rotation direction and speed of the electronic fan, perform the following steps:

[0087] If the rotation direction of the electronic fan is positive, determine whether the rotation speed of the electronic fan is greater than a preset second positive value; wherein the second positive value is not less than the first positive value;

[0088] When it is less than the second positive value, the electronic fan that is stopped by open-loop dragging is operated forward under the condition that the phase current is less than the peak operating current, and after the speed of the electronic fan is increased to the first positive value, the electronic fan is operated in a closed loop in response to the start signal.

[0089] Furthermore, in one embodiment, the control module is configured to, after executing the step of determining whether the rotation speed of the electronic fan is greater than a preset second positive value if the rotation direction of the electronic fan is positive, further execute the following steps:

[0090] When the speed is greater than the second positive value, obtaining a required duty cycle speed of the electronic fan determined based on the vehicle operating parameters, and determining whether the speed of the electronic fan is greater than the required duty cycle speed;

[0091] If the rotation speed of the electronic fan is less than the required duty cycle rotation speed, the electronic fan is operated in a closed loop in response to the start signal.

[0092] Further, in one embodiment, the control module is configured to, when executing the step greater than the second positive value, obtain the required duty cycle speed of the electronic fan determined based on the vehicle operating parameters, and after determining whether the speed of the electronic fan is greater than the requested speed, perform the following steps:

[0093] If the speed of the electronic fan is greater than the requested duty cycle speed, the start signal is not responded to and a fault signal of the electronic fan is not reported.

[0094] Among them, the functional implementation of each module in the above-mentioned control device for the automotive electronic fan corresponds to each step in the above-mentioned control method embodiment for the automotive electronic fan, and its functions and implementation processes are no longer described one by one here.

[0095] In a third aspect, an embodiment of the present application provides a control device for an automotive electronic fan. The control device for the automotive electronic fan may be a device having a data processing function, such as a personal computer (PC), a laptop computer, or a server.

[0096] Reference Figure 3 , Figure 3 Schematic diagram of the hardware structure of the control device of the automotive electronic fan involved in the embodiment of the present application. In the embodiment of the present application, the control device of the automotive electronic fan may include a processor, a memory, a communication interface and a communication bus.

[0097] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0098] The communication interface includes input / output (I / O) interface, physical interface and logical interface, etc., which are used to realize the interconnection of devices inside the control device of the automotive electronic fan, and the interface used to realize the interconnection between the control device of the automotive electronic fan and other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0099] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0100] The processor may be a general-purpose processor, and the general-purpose processor may call the control program of the automotive electronic fan stored in the memory and execute the control method of the automotive electronic fan provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the control program of the automotive electronic fan is called may refer to the various embodiments of the control method of the automotive electronic fan of the present application, and will not be repeated here.

[0101] Those skilled in the art will understand that Figure 3 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0102] In a fourth aspect, an embodiment of the present application also provides a storage medium.

[0103] The storage medium of the present application stores a control program for an automobile electronic fan, wherein when the control program for the automobile electronic fan is executed by a processor, the steps of the control method for the automobile electronic fan as described above are implemented.

[0104] The method implemented when the control program of the automobile electronic fan is executed can refer to the various embodiments of the control method of the automobile electronic fan of the present application, and will not be described in detail here.

[0105] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0106] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0107] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0108] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, 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, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0109] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0110] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0111] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for controlling an automotive electronic fan, characterized in that: The method comprises: When receiving a start signal of the electronic fan, obtaining the rotation direction and speed of the electronic fan; If the rotation direction of the electronic fan is negative, determining whether the rotation speed of the electronic fan is lower than a preset first negative value; When the value is lower than the first negative value, the start signal is not responded; When the speed is not lower than the first negative value, the electronic fan is braked, and the braked electronic fan is driven forward in an open loop under the condition that the phase current is less than the peak operating current, and after the speed of the electronic fan is increased to the first positive value, the electronic fan is operated in a closed loop in response to the start signal.

2. The control method of the automotive electronic fan according to claim 1, characterized in that: In the forward operation of the electronic fan with open-loop drag brake under the condition that the phase current is less than the peak operating current, The electronic fan stopped by open-loop drag braking runs forward under the condition that the phase current is within the set current range; wherein the set current range is smaller than the peak operating current.

3. The control method of the automotive electronic fan according to claim 2, characterized in that: The forward operation of the electronic fan stopped by open-loop drag braking under the condition that the phase current is within a preset standard current range comprises the following steps: Driving the braked electronic fan in an open loop with a preset initial voltage, and obtaining the phase current of the electronic fan under the initial voltage; Determining whether the phase current of the electronic fan is within a set current range; If not, adjust the voltage applied to the electronic fan until the phase current is within the set current range.

4. The control method of the automotive electronic fan as claimed in claim 3, characterized in that: Before the electronic fan is braked and stopped in an open loop with a preset initial voltage, the following steps are included: The motor rotor of the electronic fan is controlled to move to the initial zero position.

5. The control method of the automotive electronic fan according to claim 1, characterized in that: When the start signal of the electronic fan is received, after obtaining the rotation direction and speed of the electronic fan, the following steps are included: If the rotation direction of the electronic fan is positive, determine whether the rotation speed of the electronic fan is greater than a preset second positive value; wherein the second positive value is not less than the first positive value; When it is less than the second positive value, the electronic fan that is stopped by open-loop dragging is operated forward under the condition that the phase current is less than the peak operating current, and after the speed of the electronic fan is increased to the first positive value, the electronic fan is operated in a closed loop in response to the start signal.

6. The control method of the automotive electronic fan according to claim 5, characterized in that: If the rotation direction of the electronic fan is positive, after determining whether the rotation speed of the electronic fan is greater than a preset second positive value, the method further includes the following steps: When the speed is greater than the second positive value, obtaining a required duty cycle speed of the electronic fan determined based on the vehicle operating parameters, and determining whether the speed of the electronic fan is greater than the required duty cycle speed; If the rotation speed of the electronic fan is less than the required duty cycle rotation speed, the electronic fan is operated in a closed loop in response to the start signal.

7. The control method of the automotive electronic fan according to claim 6, characterized in that: When the speed is greater than the second positive value, obtaining the required duty cycle speed of the electronic fan determined based on the vehicle operating parameters, and determining whether the speed of the electronic fan is greater than the requested speed, the following steps are included: If the speed of the electronic fan is greater than the requested duty cycle speed, the start signal is not responded to and a fault signal of the electronic fan is not reported.

8. A control device for an automotive electronic fan, characterized in that: The device comprises: An acquisition module, configured to acquire the rotation direction and speed of the electronic fan when receiving a start signal of the electronic fan; A control module is configured to determine whether the rotation speed of the electronic fan is lower than a preset first negative value if the rotation direction of the electronic fan is negative; when it is lower than the first negative value, not respond to the start signal; when it is not lower than the first negative value, stop the electronic fan, open-loop drag the stopped electronic fan to run forward under the condition that the phase current is less than the peak operating current, and after the rotation speed of the electronic fan is increased to the first positive value, respond to the start signal to operate the electronic fan in a closed loop.

9. A control device for an automotive electronic fan, characterized in that: The control device of the automobile electronic fan includes a processor, a memory, and a control program of the automobile electronic fan stored in the memory and executable by the processor, wherein when the control program of the automobile electronic fan is executed by the processor, the steps of the control method of the automobile electronic fan as described in any one of claims 1 to 7 are implemented.

10. A storage medium, characterized in that: The storage medium stores a control program for the automotive electronic fan, wherein when the control program for the automotive electronic fan is executed by the processor, the steps of the control method for the automotive electronic fan according to any one of claims 1 to 7 are implemented.

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