Air blowing and suction integrated fan and control method thereof

Abstract

The invention discloses an air blowing and suction integrated fan and a control method thereof, and relates to the technical field of fans. The fan comprises fan blades, a shell, a control motor and a ventilation baffle. The control motor is in control connection with the ventilation baffle, and the control motor is used for switching air blowing and suction modes of the fan by changing the angle of the ventilation baffle; an air suction opening and an air blowing opening are formed in the shell; the exhaust inlet and the blow-off nozzle are blocked and separated by a clapboard; the shell and the ventilation baffle plate divide the air suction opening into an inner air suction opening and an outer air suction opening; the air blowing opening is divided into an inner air blowing opening and an outer air blowing opening through the shell and the ventilation baffle. The inner air suction opening and the inner air blowing opening are communicated with an automobile seat ventilation system; the outer air suction opening and the outer air blowing opening are communicated with the outside atmosphere; the fan circuit module comprises a fan interface circuit sub-module, a voltage reduction sub-module, a PWM sub-module, an overvoltage protection sub-module, a fan driving sub-module, a control motor driving sub-module, an MCU sub-module and a fan driving feedback sub-module. Switching of the air blowing mode and the air suction mode of the fan can be achieved.

Description

Technical Field

[0001] The present application relates to the field of fan technology, and in particular to a blower-suction integrated fan and a control method thereof. Background Art

[0002] With the improvement of living standards, cars have gradually become a means of transportation for the public, and people have higher and higher requirements for car comfort. Among them, the comfort of car seats is the most critical to the use, and more and more manufacturers are using seats with ventilation functions. Different drivers have different preferences for ventilation systems, some prefer suction systems, and some prefer blowing systems. Existing fans can only blow or suck air, and cannot achieve blowing and suction switching. Summary of the invention

[0003] The purpose of the present application is to provide a blowing and suction integrated fan and a control method thereof, which can realize flexible switching of the blowing and suction modes of the fan in the car.

[0004] To achieve the above objectives, this application provides the following solutions:

[0005] In a first aspect, the present application provides a blower and suction fan, comprising:

[0006] Fans and fan circuit modules;

[0007] The fan comprises a fan blade, a housing, a control motor and a ventilation baffle; the control motor is control-connected to the ventilation baffle, and the control motor is used to switch the blowing and suction modes of the fan by changing the angle of the ventilation baffle;

[0008] The shell is provided with an air suction port and an air blowing port; the air suction port and the air blowing port are separated by a partition;

[0009] The shell and the ventilation baffle divide the air intake port into an inner air intake port and an outer air intake port; the shell and the ventilation baffle divide the air blowing port into an inner air blowing port and an outer air blowing port; the inner air intake port and the inner air blowing port are connected to the automobile seat ventilation system; the outer air intake port and the outer air blowing port are connected to the outside atmosphere;

[0010] The fan circuit module includes a fan interface circuit submodule, a voltage reduction submodule, a PWM submodule, an overvoltage protection submodule, a fan drive submodule, a control motor drive submodule, an MCU submodule and a fan drive feedback submodule.

[0011] Optionally, a Hall sensor is also included; the Hall sensor is used to monitor the position of the ventilation damper.

[0012] Optionally, the ventilation baffle is a baffle with a magnet.

[0013] In a second aspect, the present application provides a control method based on the aforementioned integrated blowing and suction fan, comprising:

[0014] Start the fan circuit module and perform self-test through the MCU submodule to confirm that all submodules are working properly;

[0015] Obtaining an external instruction; the external instruction is a mode setting signal of the fan; the mode setting signal includes a blowing mode and a suction mode;

[0016] The fan interface circuit submodule receives the mode setting signal and transmits the signal to the MCU submodule;

[0017] The MCU submodule processes the signal and sends instructions to the control motor drive submodule to adjust the operating state of the control motor;

[0018] According to the instructions of the MCU sub-module, the motor is driven to rotate, the angle of the ventilation baffle is changed, and the switching of the blowing or suction mode is completed.

[0019] Optionally, before driving and controlling the motor to rotate and changing the angle of the ventilation baffle to complete the switching of the blowing or suction mode according to the instruction of the MCU submodule, the method further includes:

[0020] Based on the Hall sensor, the position of the ventilation damper at the current moment is obtained.

[0021] Optionally, based on the Hall sensor, obtaining the position of the ventilation damper at the current moment specifically includes:

[0022] According to the change in the distance between the magnet on the ventilation baffle and the Hall sensor, the output voltage V is obtained. out ;

[0023] The output voltage V out Input the MCU submodule to obtain the current position of the ventilation baffle.

[0024] Optionally, according to the instruction of the MCU submodule, the motor is driven to rotate, the angle of the ventilation baffle is changed, and the switching of the blowing or suction mode is completed, which specifically includes:

[0025] According to the position of the ventilation damper at the current moment, the rotation direction of the ventilation damper is determined based on the frequency of the PWM signal, and the fan speed is determined based on the PWM duty cycle to complete the switching of the blowing or suction mode.

[0026] Optionally, according to the position of the ventilation damper at the current moment, the rotation direction of the ventilation damper is determined based on the frequency of the PWM signal, and the fan speed is determined based on the PWM duty cycle to complete the switching of the blowing or suction mode, specifically including:

[0027] When the frequency based on the PWM signal is less than the set frequency, the drive control motor rotates counterclockwise, driving the ventilation baffle at the air intake port to rotate, so that the outer air intake port of the fan is opened, the inner air intake port of the fan is closed, and the ventilation baffle at the air outlet of the fan is deflected, the inner air outlet of the fan is opened, and the outer air outlet of the fan is closed;

[0028] Determine fan speed based on PWM duty cycle;

[0029] Based on the fan drive submodule, the fan blades are accelerated to complete the seat blowing.

[0030] Optionally, according to the position of the ventilation damper at the current moment, the rotation direction of the ventilation damper is determined based on the frequency of the PWM signal, and the fan speed is determined based on the PWM duty cycle to complete the switching of the blowing or suction mode, specifically including:

[0031] When the frequency based on the PWM signal is greater than the set frequency, the drive control motor rotates clockwise, driving the ventilation baffle at the air intake port to rotate, so that the inner air intake port of the fan is opened, the outer air intake port of the fan is closed, and the ventilation baffle at the air outlet of the fan is deflected, the outer air outlet of the fan is opened, and the inner air outlet of the fan is closed;

[0032] Determine fan speed based on PWM duty cycle;

[0033] Based on the fan drive submodule, the fan blades are accelerated to complete the air suction of the seat.

[0034] Optionally, the set frequency is 500 Hz.

[0035] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0036] The present application provides a blower and suction fan and a control method thereof, which realizes the switch of the blower and suction modes of the fan by controlling the control connection between the motor and the ventilation baffle. The control motor adjusts the flow direction of the airflow by changing the angle of the ventilation baffle. When the airflow is guided to the suction port, the suction mode is formed; when the airflow is guided to the blowing port, the blowing mode is formed. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of a blower and suction fan structure provided in an embodiment of the present application Figure 1 ;

[0039] Figure 2 A schematic diagram of a blower and suction fan structure provided in an embodiment of the present application Figure 2 ;

[0040] Figure 3 A fan interface diagram provided for an embodiment of the present application;

[0041] Figure 4 A step-down circuit diagram provided in an embodiment of the present application;

[0042] Figure 5 A PWM anti-static circuit and a fan stator wake-up circuit diagram provided in an embodiment of the present application;

[0043] Figure 6 An overvoltage protection circuit diagram provided in an embodiment of the present application;

[0044] Figure 7 A fan driving circuit diagram provided in an embodiment of the present application;

[0045] Figure 8 A control motor drive circuit diagram provided in an embodiment of the present application;

[0046] Fig. 9 A circuit diagram of an MCU provided in accordance with an embodiment of the present application;

[0047] Fig.10 A fan drive feedback circuit diagram provided in an embodiment of the present application;

[0048] Fig.11 A circuit diagram of a Hall sensor provided in one embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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.

[0050] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0051] Embodiment 1

[0052] like Figure 1 As shown, this embodiment provides a blower and suction fan, a fan and a fan circuit module;

[0053] The fan comprises a fan blade, a housing, a control motor and a ventilation baffle; the control motor is control-connected to the ventilation baffle, and the control motor is used to switch the blowing and suction modes of the fan by changing the angle of the ventilation baffle;

[0054] The shell is provided with an air suction port and an air blowing port; the air suction port and the air blowing port are separated by a partition;

[0055] The shell and the ventilation baffle divide the air intake port into an inner air intake port and an outer air intake port; the shell and the ventilation baffle divide the air blowing port into an inner air blowing port and an outer air blowing port; the inner air intake port and the inner air blowing port are connected to the automobile seat ventilation system; the outer air intake port and the outer air blowing port are connected to the outside atmosphere;

[0056] The fan circuit module includes a fan interface circuit submodule, a voltage reduction submodule, a PWM submodule, an overvoltage protection submodule, a fan drive submodule, a control motor drive submodule, an MCU submodule and a fan drive feedback submodule.

[0057] Specifically, Figure 2 As shown, in this embodiment, a Hall sensor is also included; the Hall sensor is used to monitor the position of the ventilation damper, and the circuit diagram of the Hall sensor is as shown in Fig.11 As shown. The ventilation baffle is a baffle with a magnet. The control motor cooperates with the ventilation baffle to achieve the switching of the blowing and suction modes of the integrated blowing and suction fan by changing the angle of the ventilation baffle.

[0058] Among them, the fan interface of the fan interface circuit submodule is a 3-pin plug, which can adjust the fan speed through PWM while realizing the fan blowing and suction control, with simple structure and convenient control. The interface in the fan interface diagram is divided into pins, pads and stator interfaces. Among them, pin 1 of the pin is connected to the backup battery, pin 2 is grounded, and pin 3 is connected to PWM, pin 1 of the pad is connected to the backup battery, pin 2 is grounded, and pin 3 is connected to PWM; pin 1 of the stator interface is connected to StatorU, pin 2 is connected to StatorV, and pin 3 is connected to StatorW.

[0059] Among them, the circuit diagram of the buck submodule is as follows Figure 4 As shown in the figure, the input power first passes through a specially designed protection circuit. The main function of this circuit is to ensure the safe operation of the subsequent circuits and prevent damage caused by unstable voltage or excessive current. After being processed by the protection circuit, the power supply will enter a voltage reduction and noise reduction link. This process is to reduce the input voltage to a level suitable for the normal operation of key electronic components such as the stator, control motor, and microcontroller unit (MCU), and at the same time remove possible noise interference to ensure the stability and purity of the power supply. In order to understand this process more intuitively, Figure 4The various components of the circuit and the connections between them are shown in detail.

[0060] Specifically, the PWM anti-static circuit and fan stator wake-up circuit in the PWM submodule are shown in the figure. Figure 5 As shown in the figure, this circuit is mainly used to prevent electrostatic discharge from damaging the PWM submodule and its connected electronic components. Electrostatic discharge is a common electrical phenomenon that may cause damage to circuit components or performance degradation if not protected.

[0061] Specifically, the fan stator wake-up circuit is mainly used to wake up the fan stator and start it running. In electronic systems, fans are often used to dissipate heat to ensure the stable operation of the system. However, in some cases, the fan may stop running for various reasons. At this time, the fan stator wake-up circuit can play a role by sending a wake-up signal to the fan stator to restart it and continue to dissipate heat. This is crucial to maintaining the stability and reliability of the system. The PWM anti-static circuit and the fan stator wake-up circuit jointly ensure the safe operation of the circuit and the stability of the system.

[0062] Specifically, the overvoltage protection circuit in the overvoltage protection submodule is as follows: Figure 6 As shown in Figure 1, the overvoltage protection submodule is mainly used to protect the circuit from damage caused by excessive voltage. Figure 6 In the overvoltage protection circuit shown, when the input voltage exceeds a preset safety threshold, the overvoltage protection circuit will respond quickly by cutting off the power supply or initiating other protection measures to prevent the components in the circuit from being damaged due to excessive voltage.

[0063] Specifically, the fan drive circuit diagram in the fan drive submodule is as follows: Figure 7 As shown in the figure, the fan drive submodule is mainly used to control and drive the operation of the fan. Figure 7 In the fan drive circuit diagram shown, this submodule implements functions such as starting and stopping the fan motor and adjusting the speed. Specifically, the fan drive circuit can receive signals from the control system (microprocessor) and adjust the working state of the fan according to these signals. This includes but is not limited to automatically adjusting the fan speed according to the system temperature or load conditions to ensure the heat dissipation effect and operation stability of the equipment.

[0064] Specifically, in this embodiment, the control motor is a stepper motor, and the stepper motor driving circuit in the control motor driving submodule is as shown in FIG. Figure 8 As shown, the main uses include:

[0065] Precisely control the movement of the stepper motor. The stepper motor is an open-loop control element that converts electrical pulse signals into angular displacement or linear displacement. By inputting the number, frequency and direction of the pulse signal, the stepper motor's rotation angle, speed and direction can be precisely controlled. The stepper motor drives the two ventilation baffles to deflect simultaneously through the gear set, and uses the gear transmission principle to achieve relative reverse rotation of the two ventilation baffles to achieve changes in the air duct.

[0066] Specifically, the MCU circuit diagram in the MCU submodule is as follows Fig. 9 As shown in the figure, the MCU (microcontroller unit) submodule is responsible for processing input signals, executing program instructions, controlling output devices, etc. Specifically, the MCU circuit diagram in the MCU submodule has the following uses:

[0067] Signal processing: The MCU circuit diagram receives signals from the Hall sensor through its input interface. These signals are converted into digital signals by the analog-to-digital converter inside the MCU for processing by the MCU.

[0068] Program execution: The MCU contains flash memory or ROM to store program code. When the MCU receives a start signal or meets certain conditions, it reads the program instructions from the flash memory and executes them. Specifically, the MCU outputs voltage V out The signal determines the baffle position, determines the rotation direction according to the PWM frequency, and drives the stepper motor to rotate the ventilation baffle to change the opening and closing status of each air outlet to achieve the switching of blowing and suction modes.

[0069] Specifically, the fan drive feedback circuit in the fan drive feedback submodule is as follows: Fig.10 As shown in the figure, the fan drive feedback circuit in the fan drive feedback submodule is mainly used to monitor and control the operating status of the fan. Specifically, the circuit can provide real-time feedback of the fan's speed, operating status, and possible fault information to the control system. Through this feedback mechanism, the control system can accurately adjust the fan's speed to meet the heat dissipation requirements under different workloads while ensuring that the fan operates within a safe and efficient range. In addition, once the fan fails or an abnormal condition occurs, the feedback circuit will immediately send a signal to the control system so that timely measures can be taken to avoid overheating or other potential problems. Therefore, the fan drive feedback circuit plays an important role in ensuring the stable operation of the equipment and extending its service life.

[0070] Embodiment 2

[0071] This embodiment provides a control method based on the aforementioned blowing and suction integrated fan, including:

[0072] Step 1: Start the fan circuit module and perform self-test through the MCU submodule to confirm that all submodules are working properly;

[0073] Step 2: Obtain an external instruction; the external instruction is a mode setting signal of the fan; the mode setting signal includes a blowing mode and a suction mode;

[0074] Step 3: The fan interface circuit submodule receives the mode setting signal and transmits the signal to the MCU submodule;

[0075] Step 4: Based on the MCU submodule, the signal is processed and instructions are sent to the control motor drive submodule to adjust the operating state of the control motor;

[0076] Step 5: According to the instructions of the MCU sub-module, the motor is driven to rotate, the angle of the ventilation baffle is changed, and the blowing or suction mode is switched.

[0077] In some embodiments, before driving and controlling the motor to rotate and changing the angle of the ventilation baffle to complete the switching of the blowing or suction mode according to the instruction of the MCU submodule, the method further includes:

[0078] Based on the Hall sensor, the position of the ventilation damper at the current moment is obtained.

[0079] Wherein, when the execution step is based on the Hall sensor to obtain the position of the ventilation damper at the current moment, it specifically includes:

[0080] According to the change in the distance between the magnet on the ventilation baffle and the Hall sensor, the output voltage V is obtained. out ;

[0081] The output voltage V out Input the MCU submodule to get the current position of the ventilation damper. Specifically, in terms of ventilation damper position monitoring, the position of the ventilation damper is monitored in real time through a magnet and a Hall sensor. When the stepper motor drives the ventilation damper to rotate, the distance between the magnet on the ventilation damper and the Hall sensor changes, and the magnetic field changes accordingly. When the ventilation damper rotates to the extreme position, the magnetic field increases or decays to a certain range, and the Hall sensor sends a control signal to the MCU, and the MCU controls the stepper motor to stop rotating.

[0082] In some embodiments, according to the instruction of the MCU submodule, the motor is driven to rotate, the angle of the ventilation baffle is changed, and the switching of the blowing or suction mode is completed, which specifically includes:

[0083] According to the position of the ventilation damper at the current moment, the rotation direction of the ventilation damper is determined based on the frequency of the PWM signal, and the fan speed is determined based on the PWM duty cycle to complete the switching of the blowing or suction mode.

[0084] Among them, according to the position of the ventilation damper at the current moment, the rotation direction of the ventilation damper is determined based on the frequency of the PWM signal, and the fan speed is determined based on the PWM duty cycle to complete the switching of the blowing or suction mode, which specifically includes:

[0085] When the frequency based on the PWM signal is less than the set frequency, the drive control motor rotates counterclockwise, driving the ventilation baffle at the air intake port to rotate, so that the outer air intake port of the fan is opened, the inner air intake port of the fan is closed, and the ventilation baffle at the air outlet of the fan is deflected, the inner air outlet of the fan is opened, and the outer air outlet of the fan is closed;

[0086] Determine fan speed based on PWM duty cycle;

[0087] Based on the fan drive submodule, the fan blades are accelerated to complete the seat blowing.

[0088] When the frequency based on the PWM signal is greater than the set frequency, the drive control motor rotates clockwise, driving the ventilation baffle at the air intake port to rotate, so that the inner air intake port of the fan is opened, the outer air intake port of the fan is closed, and the ventilation baffle at the air outlet of the fan is deflected, the outer air outlet of the fan is opened, and the inner air outlet of the fan is closed;

[0089] Determine fan speed based on PWM duty cycle;

[0090] Based on the fan drive submodule, the fan blades are accelerated to complete the air suction of the seat.

[0091] Specifically, the PWM signal is input into the MCU after passing through the noise reduction protection circuit. The MCU identifies the frequency and duty cycle of the PWM signal, determines the working mode (blowing mode or suction mode) of the integrated blowing and suction fan through the program, and then controls the stepper motor to drive the ventilation baffle to rotate.

[0092] For example, the frequency is lower than 500Hz for blowing mode, and higher than 500Hz for suction mode. When the frequency is lower than 500Hz, the stepper motor rotates counterclockwise, driving the ventilation baffle at the suction port to rotate, so that the outer suction port is opened; the inner suction port is closed, and the ventilation baffle at the blowing port is deflected, so that the inner blowing port is opened and the outer blowing port is closed. Air is sucked in from the outer suction port, and flows out from the inner blowing port after being accelerated by the fan blades, thereby achieving seat blowing. When the frequency is higher than 500Hz, the stepper motor rotates clockwise, driving the ventilation baffle at the suction port to rotate, so that the inner suction port is opened; the outer suction port is closed. The ventilation baffle at the blowing port is deflected, so that the outer blowing port is opened; the inner blowing port is closed. Air is sucked in from the inner suction port, and flows out from the outer blowing port after being accelerated by the fan blades, thereby achieving seat suction.

[0093] In summary, this application has the following technical effects:

[0094] 1) The integrated blower and suction fan allows passengers to adjust the blowing or suction according to their personal preferences to achieve a personalized seat environment. The blower and suction design of the fan can promote air circulation, reduce moisture on the seat surface, keep the seat dry, and improve riding comfort.

[0095] 2) The integrated blower and suction fan adopts a centrifugal fan, optimizes the air duct design, increases the ventilation cross-sectional area of ​​the suction port and the blowing port, reduces noise and energy consumption while providing good ventilation effect.

[0096] 3) A stepper motor drives two ventilation baffles to deflect simultaneously through a gear set, and the gear transmission principle is used to realize the relative reverse rotation of the two ventilation baffles to achieve the change of the air duct, simplify the structure, reduce costs, and improve reliability. The deflection of the ventilation baffle is controlled by changing the PWM frequency to change the blowing and suction, and the fan speed is changed by changing the PWM duty cycle. The position of the ventilation baffle is monitored in real time by a magnet in conjunction with a Hall sensor to ensure that the ventilation baffle reaches the limit position to ensure the ventilation effect. The device has a simple structure, reliable operation, and occupies a small space.

[0097] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A blower and suction fan, characterized in that: The integrated blowing and suction fan comprises: a fan and a fan circuit module; The fan comprises a fan blade, a housing, a control motor and a ventilation baffle; the control motor is control-connected to the ventilation baffle, and the control motor is used to switch the blowing and suction modes of the fan by changing the angle of the ventilation baffle; The shell is provided with an air suction port and an air blowing port; the air suction port and the air blowing port are separated by a partition; The shell and the ventilation baffle divide the air intake port into an inner air intake port and an outer air intake port; the shell and the ventilation baffle divide the air blowing port into an inner air blowing port and an outer air blowing port; the inner air intake port and the inner air blowing port are connected to the automobile seat ventilation system; the outer air intake port and the outer air blowing port are connected to the outside atmosphere; The fan circuit module includes a fan interface circuit submodule, a voltage reduction submodule, a PWM submodule, an overvoltage protection submodule, a fan drive submodule, a control motor drive submodule, an MCU submodule and a fan drive feedback submodule.

2. The blower and suction fan according to claim 1, characterized in that: A Hall sensor is also included; the Hall sensor is used to monitor the position of the ventilation damper.

3. The blower and suction fan according to claim 1, characterized in that: The ventilation baffle is a baffle with magnets.

4. A control method for a blower and suction fan according to any one of claims 1 to 3, characterized in that: include: Start the fan circuit module and perform self-test through the MCU submodule to confirm that all submodules are working properly; Obtaining an external instruction; the external instruction is a mode setting signal of the fan; the mode setting signal includes a blowing mode and a suction mode; The fan interface circuit submodule receives the mode setting signal and transmits the signal to the MCU submodule; The MCU submodule processes the signal and sends instructions to the control motor drive submodule to adjust the operating state of the control motor; According to the instructions of the MCU sub-module, the motor is driven to rotate, the angle of the ventilation baffle is changed, and the switching of the blowing or suction mode is completed.

5. The control method of a blower and suction fan according to claim 4, characterized in that: Before the motor is driven to rotate and the angle of the ventilation baffle is changed according to the instruction of the MCU submodule to switch the blowing or suction mode, the following steps are also included: Based on the Hall sensor, the position of the ventilation damper at the current moment is obtained.

6. The control method of a blower and suction fan according to claim 5, characterized in that: Based on the Hall sensor, the position of the ventilation damper at the current moment is obtained, including: According to the change in the distance between the magnet on the ventilation baffle and the Hall sensor, the output voltage V is obtained. out ; The output voltage V out Input the MCU submodule to obtain the current position of the ventilation baffle.

7. The control method of the blowing and suction integrated fan according to claim 6, characterized in that: According to the instructions of the MCU submodule, the motor is driven to rotate, the angle of the ventilation baffle is changed, and the blowing or suction mode is switched, including: According to the position of the ventilation damper at the current moment, the rotation direction of the ventilation damper is determined based on the frequency of the PWM signal, and the fan speed is determined based on the PWM duty cycle to complete the switching of the blowing or suction mode.

8. The control method of the blowing and suction integrated fan according to claim 7, characterized in that: According to the current position of the ventilation damper, the rotation direction of the ventilation damper is determined based on the frequency of the PWM signal, and the fan speed is determined based on the PWM duty cycle to complete the switching of the blowing or suction mode, which specifically includes: When the frequency based on the PWM signal is less than the set frequency, the drive control motor rotates counterclockwise, driving the ventilation baffle at the air intake port to rotate, so that the outer air intake port of the fan is opened, the inner air intake port of the fan is closed, and the ventilation baffle at the air outlet of the fan is deflected, the inner air outlet of the fan is opened, and the outer air outlet of the fan is closed; Determine fan speed based on PWM duty cycle; Based on the fan drive submodule, the fan blades are accelerated to complete the seat blowing.

9. The control method of a blower and suction fan according to claim 7, characterized in that: According to the current position of the ventilation damper, the rotation direction of the ventilation damper is determined based on the frequency of the PWM signal, and the fan speed is determined based on the PWM duty cycle to complete the switching of the blowing or suction mode, which specifically includes: When the frequency based on the PWM signal is greater than the set frequency, the drive control motor rotates clockwise, driving the ventilation baffle at the air intake port to rotate, so that the inner air intake port of the fan is opened, the outer air intake port of the fan is closed, and the ventilation baffle at the air outlet of the fan is deflected, the outer air outlet of the fan is opened, and the inner air outlet of the fan is closed; Determine fan speed based on PWM duty cycle; Based on the fan drive submodule, the fan blades are accelerated to complete the air suction of the seat.

10. The control method of a blower and suction fan according to claims 8 to 9, characterized in that: The set frequency is 500 Hz.

Images