Braking particulate matter emission reduction device and method suitable for new energy vehicle

Abstract

The invention relates to the technical field of braking devices, in particular to a braking particulate matter emission reduction device and method suitable for a new energy vehicle. The device comprises a dust collection cover covering a brake device, a particulate matter adsorption system connected with the dust collection cover, a controller, a fan and an electrostatic generation system, the dust collection cover is used for collecting brake particles and conveying air mixed with the brake particles to the particle adsorption system through a pipeline under the action of the fan; the controller controls the electrostatic generation system to generate an electric field and adjusts the intensity of the electric field; opening and closing of a fan are controlled, and air volume is adjusted; the particulate matter adsorption system adsorbs particulate matter under the action of an electric field, and after the electric field disappears, the particulate matter automatically falls into the dust collection box.

Description

Technical Field

[0001] The present invention relates to the technical field of braking devices, and in particular to a braking particulate matter emission reduction device and method suitable for new energy vehicles. Background Art

[0002] With the rapid development of the automobile industry, the number of vehicles has continued to grow, and the problem of automobile exhaust and related pollutant emissions has become increasingly serious. Among the many pollutants, particulate matter generated by brake wear has gradually attracted attention. During the braking process of traditional fuel vehicles and new energy vehicles, the friction between the brake pads and the brake discs will cause material wear, thereby generating a large amount of fine particulate matter.

[0003] These brake wear particles have many hazards. From an environmental perspective, they are one of the important sources of atmospheric particulate pollution. Fine particles suspended in the air are difficult to settle for a long time, which will aggravate the formation of smog weather, have a serious impact on air quality, and destroy the balance of the ecological environment. From the perspective of human health, people will inevitably inhale these particles in their daily lives, especially the inhalable particles with smaller particle sizes. They can penetrate deep into the human respiratory system and cause respiratory diseases, cardiovascular diseases, etc., which seriously threaten human health.

[0004] At present, some devices and technologies have emerged to reduce the emission of brake wear particles. Some devices reduce the generation of particles by improving the brake pad material and using more wear-resistant and low-dust materials. However, the cost of new materials is often high, which limits their widespread application. Others capture particles by adding simple filtering structures to the brake system, but these filtering structures are easy to clog and are less convenient to use.

[0005] At present, with the rapid growth of production and sales of new energy vehicles, it is necessary to develop a brake wear particulate matter reduction device suitable for new energy vehicles. Summary of the invention

[0006] The purpose of the present invention is to provide a brake particulate matter emission reduction device and method suitable for new energy vehicles to reduce the emission of brake particulate matter. By controlling the fan air volume and electric field strength, particulate matter can be collected according to the actual situation of the vehicle, while ensuring the comprehensiveness of particulate matter collection, maintaining vehicle endurance and ensuring the safe operation of the emission reduction device.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: The present invention provides a brake particle emission reduction device suitable for new energy vehicles, comprising: a dust collecting hood, a particle adsorption system connected to the dust collecting hood, a controller, a fan and an electrostatic generation system; The dust collecting hood is used to collect brake particles, and under the action of the fan, the air mixed with brake particles is transported to the particle adsorption system through the pipeline; The controller controls the electrostatic generating system to generate an electric field and adjust the electric field strength; controls the fan to open and close and adjust the air volume; The particle adsorption system adsorbs particles under the action of an electric field, and after the electric field disappears, the particles automatically fall off into the dust collection box.

[0008] The present invention provides a brake particle emission reduction method applicable to new energy vehicles, applicable to a brake particle emission reduction device, and executed by a controller. The emission reduction method includes: Obtain the current braking strength, current remaining power, current driving mode and current braking energy recovery strength of new energy vehicles; Determining a target electric field strength according to the current braking strength, the current remaining power, the current driving mode, and the current braking energy recovery strength, and controlling the electrostatic generation system to generate the target electric field strength; The target air volume is determined according to the current braking intensity, the current remaining power, the current driving mode and the current braking energy recovery intensity, and the fan is controlled to generate the target air volume.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention uses the principle of electrostatic adsorption to adsorb particulate matter, making up for the shortcoming of the filter structure in the prior art that is easily clogged. Based on the use of electric field and charge, it is more suitable for new energy vehicles. Moreover, the present invention can adjust the electric field strength and air volume, and can collect particulate matter according to the actual situation of the vehicle, while ensuring the comprehensiveness of particulate matter collection, maintaining vehicle endurance and ensuring the safe operation of the emission reduction device. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is a structural diagram of a braking particulate matter reduction device for a new energy vehicle provided by an embodiment of the present invention; Figure 2 is a structural diagram of another braking particulate matter reduction device for new energy vehicles provided by an embodiment of the present invention; Figure 3 is an AA cross-sectional view of a particle adsorption system provided by an embodiment of the present invention; Figure 4 It is a flow chart of a method for reducing emission of particulate matter from braking of a new energy vehicle provided by an embodiment of the present invention; Among them, there are brake pedal 1, pressure sensor 2, line 3, controller 4, motor 5 of new energy vehicle, fan 6, pipeline 7, particle adsorption system 8, dust absorption plate 8-1, dust collection box 8-2, static electricity generating system 9, wire electrode 9-1, transformer 9-2, brake parts 10, caliper 10-1, brake disc 10-2, brake pad 10-3, wheel hub 10-4, and dust collection hood 11. DETAILED DESCRIPTION

[0012] The following is a description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present invention. Similarly, for clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0013] Example 1 The embodiment of the present invention is applicable to the situation where the brake particulate matter of new energy vehicles is collected to achieve emission reduction effect. Figure 1 and Figure 2 The braking particulate matter reduction device for new energy vehicles provided in this embodiment includes: a dust collecting hood 11, a particulate matter adsorption system 8 connected to the dust collecting hood 11, a controller 4, a fan 6 and an electrostatic generating system 9. Each component and function is described in detail below.

[0014] The dust hood 11 is a hood structure that fits the shape of the brake disc and the brake caliper 10-1. The brake component 10 includes a caliper 10-1, a brake disc 10-2, a brake pad 10-3 and a wheel hub 10-4. When wear particles are generated during the braking process, due to the air flow disturbance during the vehicle driving process and the inertia of the particles themselves, they will be guided into the dust hood 11. The dust hood 11 is provided with an opening for conveying the collected air mixed with particles to the particle adsorption system 8.

[0015] Optionally, the dust cover 11 is wrapped around the wheel hub 10-4 near the brake disc and brake pad. The position of the dust cover 11 cannot affect the operation of the brake component 10. Its shape is designed to match the internal space of the wheel hub 10-4 and can cover the area where the brake component 10 produces wear particles to the greatest extent. It is a semi-enclosed structure with an opening facing the friction surface of the brake disc 10-2 and the brake pad 10-3. The material of the dust cover 11 should have good heat dissipation, sufficient strength, and should be lightweight.

[0016] Preferably, a metal ear is welded on the dust hood 11. In order not to damage the components such as the automobile wheel hub 10-4, the present invention fixes the dust hood 11 by connecting the dust hood 11 to the frame. The dust hood 11 is fixed to the frame by a high-strength connecting rod. One end of the connecting rod is connected to the frame, and the other end is connected to the ear of the dust hood 11. This solution adopts bolt connection, which has strong practicality and is convenient for disassembly and cleaning.

[0017] See also Figure 1 and Figure 2 The device also includes a fan 6. Under the negative pressure of the fan 6, air mixed with brake particles is transported to the particle adsorption system 8 through a pipeline 7.

[0018] See also Figure 2 and Figure 3 The particle adsorption system 8 includes a dust collecting plate 8-1 and a dust collecting box 8-2, which is responsible for adsorbing particles through the dust collecting plate 8-1 and collecting the particles into the dust collecting box 8-2. The electrostatic generation system 9 includes a transformer 9-2 and a wire electrode 9-1, which is responsible for generating a high-voltage electric field to charge the particles. The electrostatic generation system 9 and the particle adsorption system 8 are connected through a circuit, and the electrostatic generation system 9 and the particle adsorption system 8 are wrapped by an insulating shell to prevent electric shock.

[0019] The basic principle of electrostatic adsorption is to use a high-voltage electric field to charge the brake particles in the air. The charged particles move toward the electrode under the action of the electric field force and are adsorbed, thereby achieving separation from the air. When the airflow containing brake particles passes through the high-voltage electric field, the gas molecules are ionized, generating a large number of ions and electrons. The particles collide with these ions and electrons and become charged. Under the action of the electric field force, the charged brake particles move toward the electrode with the opposite polarity and are finally adsorbed on the surface of the dust collecting plate 8-1.

[0020] The dust collecting plate 8-1 is made of corrosion-resistant and highly conductive metal material. When the particles adsorbed by the dust collecting plate 8-1 reach a certain level, the electric field strength on the surface of the dust collecting plate 8-1 is changed by the controller 4. Under the action of the electric field force, the forces between the adsorbed particles and between the particles and the surface of the dust collecting plate 8-1 change, so that the particles automatically detach from the surface of the dust collecting plate 8-1 and fall into the dust collecting box 8-2 at the bottom. This automatic desorption process is performed irregularly during the process of parking and powering off the vehicle, and the user does not need to manually clean the dust collecting plate 8-1. The dust collecting box 8-2 can be replaced or cleaned regularly.

[0021] In a specific embodiment, the controller 4 controls the electrostatic generating system 9 to generate an electric field and adjust the electric field strength (for example, controlling the voltage value generated by the transformer 9-2); controls the fan 6 to open and close and adjust the air volume (for example, controlling the output power of the fan 6). Optionally, the controller 4 is connected to the pressure sensor 2 of the brake pedal 1 and the vehicle system. When the user steps on the brake pedal 1, the caliper 10-1 pushes the brake pad to the brake disc, and the friction between the brake disc and the brake pad causes the car to slow down, and wear particles are generated at the same time. When the car is moving forward and braking, the wheel hub 10-4 rotates counterclockwise, and the direction of particle falling is clockwise. Due to the air flow disturbance during the vehicle's driving process and the inertia of the particles themselves, they will be guided into the dust hood 11; at the same time, the pressure sensor 2 converts the pressure signal of the brake pedal 1 into an electrical signal, which is transmitted to the controller 4 through the line 3. The controller 4 starts the electrostatic generating system 9 and the fan 6. Under the action of the fan 6, the air mixed with brake particles is transported to the particle adsorption system 8 through the pipeline 7. After the electrostatic generation system 9 is started, the voltage of the power battery of the new energy vehicle (generally around 300V-500V) is converted into a stable DC high-voltage electric field through the transformer 9-2, and the voltage range is about 0-30kV. The specific voltage value can be adjusted according to the vehicle calibration. The negative electrode of the electrostatic generation system 9 is the linear electrode 9-1, which is made of fine metal wire. When the airflow containing brake particles passes through the high-voltage electric field, the gas molecules are ionized to produce a large number of ions and electrons. The brake particles are charged after colliding with these ions and electrons. The dust absorption plate 8-1 is connected to the positive electrode of the electrostatic generation system 9 and is made of a thin metal plate. Under the action of the electric field force, the brake particles with negative charge move toward the electrode with opposite polarity and are adsorbed on the dust absorption plate 8-1. When the vehicle stops and the power is turned off, the high-voltage electric field disappears, and the particles adsorbed on the dust absorption plate 8-1 fall into the dust collection box 8-2, completing the collection of the particles.

[0022] Optionally, the vehicle system transmits the current remaining power, the current driving mode, and the current braking energy recovery intensity to the controller 4, so that the controller 4 adjusts the electric field strength and the wind volume according to the acquired information.

[0023] Optionally, the device further comprises a temperature sensor for measuring the temperature of the environment surrounding the fan 6 and transmitting the temperature to the controller 4, so that the controller 4 adjusts the electric field strength and the air volume according to the temperature.

[0024] Optionally, the device also includes a motor 5 for supplying power to the controller 4 , the fan, and the electrostatic generating system 9 .

[0025] The present invention uses the principle of electrostatic adsorption to adsorb particulate matter, making up for the shortcoming of the filter structure in the prior art that is easily clogged. Based on the use of electric field and charge, it is more suitable for new energy vehicles. Moreover, the present invention can adjust the electric field strength and air volume, and can collect particulate matter according to the actual situation of the vehicle, while ensuring the comprehensiveness of particulate matter collection, maintaining vehicle endurance and ensuring the safe operation of the emission reduction device.

[0026] Example 2 Based on the above embodiments, this embodiment provides a brake particle emission reduction method applicable to new energy vehicles, which is applicable to the above brake particle emission reduction device applicable to new energy vehicles; the method is executed by a controller, see Figure 4 , including the following operations: S110, obtaining the current braking intensity, current remaining power, current driving mode and current braking energy recovery intensity of the new energy vehicle.

[0027] The controller determines the current braking intensity based on the electrical signal provided by the pressure sensor of the brake pedal, which can be quantified as a value from 0 to 1, where 0 represents no braking and 1 represents maximum braking intensity.

[0028] The controller obtains the current remaining power of the vehicle, the current driving mode and the current braking energy recovery intensity according to the vehicle system. Among them, the current remaining power ranges from 0 to 1, 0 means the power is exhausted, and 1 means full power. The current driving mode includes economic mode and sports mode. The economic mode is suitable for daily driving, focusing on energy saving and endurance. The sports mode is suitable for pursuing driving pleasure, focusing on power and operation. The current braking energy recovery intensity ranges from 0 to 1, 0 means no energy recovery, and 1 means maximum energy recovery intensity.

[0029] S120. Determine the target electric field strength according to the current braking intensity, the current remaining power, the current driving mode and the current braking energy recovery intensity, and control the electrostatic generating system to generate the target electric field strength.

[0030] S130. Determine the target air volume according to the current braking intensity, the current remaining power, the current driving mode and the current braking energy recovery intensity, and control the fan to generate the target air volume.

[0031] Determine the target electric field strength E according to the following formula field : E field =B×E base ×(1+a×M+b×E+c×(1-R)); Formula (1) Among them, B is the current braking intensity. The greater the current braking intensity, the greater B (quantized into a value of 0 to 1, 0 means no braking, and 1 means the maximum braking intensity); E baseis the basic electric field strength, which is set according to the actual calibration of the vehicle; M is the driving mode coefficient, which is obtained by testing the number of particulate matter generated in the current driving mode, for example, M = 0.2 in economic mode and M = 0.8 in sports mode; E is the normalized value of the current remaining power, the smaller the current remaining power, the smaller E (the value range is 0~1, 0 means exhausted, and 1 means fully charged); R is the normalized value of the current braking recovery intensity, the higher the current braking recovery intensity, the larger R (the value range is 0~1, 0 means no energy recovery, and 1 means maximum energy recovery intensity); a, b, c are coefficients, which represent the degree of influence of M, E, and R on the number of particulate matter, and can be adjusted according to the actual braking conditions of different vehicles.

[0032] When the braking intensity is low, such as when you occasionally lightly brake during slow driving in the city, the brake particles generated are small and the particle size is relatively large. The electrostatic adsorption device can automatically adjust the electric field strength to a lower level, which can both meet the adsorption needs and reduce energy consumption. When the braking intensity is high, such as emergency braking or heavy braking during high-speed driving, a large number of particles with complex particle size distribution are generated, and the electric field strength is immediately increased to a higher level to ensure sufficient adsorption force for particles of different particle sizes, quickly capture particles, and reduce emissions.

[0033] For electric vehicles, when the current remaining power is low, in order to ensure the endurance, the electric field strength is appropriately reduced while meeting the basic adsorption effect. Because when the power is low, the vehicle driving mode may tend to be flat, the brake particle emission is reduced, and reducing the energy consumption of the electrostatic adsorption device can extend the endurance. When the current remaining power is sufficient, the electric field strength can be appropriately increased according to the actual brake particle emission to more efficiently adsorb particles.

[0034] In economic mode, the vehicle's power output is limited, driving is smooth, the braking frequency and intensity are low, less particulate matter is generated, and the electrostatic adsorption device maintains a low electric field strength. In sports mode, the vehicle accelerates and decelerates frequently, the braking intensity is strong, and more particulate matter is emitted. The electric field strength is automatically increased to cope with the generation of a large amount of particulate matter.

[0035] When the vehicle is in the braking energy recovery mode, it is necessary to judge the intensity of energy recovery. If the energy recovery intensity is low, it means that the braking system is involved to a certain extent and more brake particulate matter is generated. At this time, the electric field strength can be maintained at a relatively high basic level. When the energy recovery intensity is high, although it mainly relies on the reverse work of the motor to decelerate, the braking system may also intervene to a lesser extent, thereby generating less particulate matter. At this time, according to the actual working state of the braking system, if obvious braking action is detected, the electric field strength is appropriately increased, but the increase is less than the intensity increase during pure mechanical braking, so as to achieve effective adsorption of a small amount of particulate matter that may be generated, while taking into account energy consumption.

[0036] Optionally, the target air volume F is determined according to the following formula: wind : F wind =B×F base ×(1+a1×M+b1×E+c1×(1-R)); Formula (2) Among them, F base is the basic air volume, which is set according to the actual vehicle calibration situation. a1, b1, c1 are coefficients, which represent the influence of M, E, and R on the number of particles. They can be adjusted according to the actual braking conditions of different vehicles. The explanation and quantitative values ​​of B, M, E, and R refer to the above formula (1) and will not be repeated here.

[0037] The current braking intensity is low, and less particulate matter is generated. Appropriately reducing the collected air volume can not only ensure effective collection of particulate matter, but also reduce fan energy consumption. The current braking intensity is high, and a large amount of particulate matter is generated. Rapidly increase the collected air volume to ensure that the generated particulate matter can be sucked into the electrostatic adsorption device in time to prevent the particulate matter from spreading around the vehicle.

[0038] When the vehicle's current remaining power is low, the collected air volume is reduced to reduce fan energy consumption and extend battery life. When the current remaining power is sufficient, the air volume can be appropriately increased according to actual conditions when particulate matter emissions are high to enhance the collection effect.

[0039] In economy mode, the air volume is kept at a low level due to the low emission of brake particles. In sport mode, the air volume is increased due to the high emission of particles.

[0040] In the braking energy recovery mode, the air volume is adjusted according to the energy recovery intensity. When the energy recovery intensity is low, the air volume is kept at a high basic value because more brake particles are generated at this time. When the energy recovery intensity is high and the brake system is involved to a certain extent, the air volume is appropriately reduced, but the increase is less than the increase in air volume during pure mechanical braking, ensuring that while collecting possible particles, it does not consume excessive energy.

[0041] In some cases, when the fan works at high power for a long time, it will emit a lot of heat. Some of the heat will be transferred to the pipe, which will have a negative impact on the particle adsorption system and even cause failure. Therefore, the controller obtains the temperature T of the fan's surrounding environment from the temperature sensor in real time. If the temperature T exceeds the safety threshold T0, the air volume adjustment factor p is determined according to the temperature, and the formula (2) is corrected according to the air volume adjustment factor p to obtain formula (3): F wind =B×F base ×(1+a1×M+b1×E+c1×(1-R)-p); Formula (3) If the temperature T exceeds the safety threshold T0, p is determined according to the temperature excess (T-T0). The greater the temperature excess, the greater the p. For example, p is 0-0.3. For example, (T-T0) is normalized to a value of 0-0.3. In this way, the higher the temperature, the greater the degree of reduction in air volume, so as to reduce the heat generated by the fan.

[0042] The electric field adjustment factor q is determined according to the wind volume adjustment factor; formula (1) is corrected according to the electric field adjustment factor q to obtain formula (4): E field =B×E base ×(1+a×M+b×E+c×(1-R)+q); Formula (1) Although the air volume of the fan is reduced, the brake particles are still generated at the rate before the reduction. When the air flow rate slows down, the concentration of particles in the air flow will increase, so the electric field strength should be appropriately increased. The larger the air volume adjustment factor, the larger the electric field adjustment factor, which can be obtained through actual vehicle calibration.

[0043] If the temperature of the environment around the fan drops to a safe threshold, the air volume adjustment factor p and the electric field adjustment factor q are set to zero, and the electric field intensity and air volume are adjusted according to formula (1) and formula (2).

[0044] The emission reduction method provided in this embodiment takes into account the current braking intensity, the current driving mode, the current remaining power, and the current braking recovery intensity, and comprehensively provides control logic for the electric field intensity and the air volume, which is conducive to collecting particulate matter according to the actual situation of the vehicle, while ensuring the comprehensiveness of particulate matter collection, maintaining vehicle endurance, and ensuring the safe operation of the emission reduction device; further, considering the safety of emission reduction operations, when the temperature is high, reducing the air volume and increasing the electric field intensity can reduce the heat generated by the fan while ensuring the comprehensiveness of particulate matter collection.

[0045] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0046] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A braking particulate matter reduction device suitable for new energy vehicles, characterized in that: include: A dust collecting hood, a particle adsorption system connected to the dust collecting hood, a controller, a fan and an electrostatic generating system; The dust collecting hood is used to collect brake particles, and under the action of the fan, the air mixed with brake particles is transported to the particle adsorption system through the pipeline; The controller controls the electrostatic generating system to generate an electric field and adjust the electric field strength; controls the fan to open and close and adjust the air volume; The particle adsorption system adsorbs particles under the action of an electric field, and after the electric field disappears, the particles automatically fall off into the dust collection box.

2. The device according to claim 1, characterized in that The particle adsorption system includes a dust absorption plate and a dust collection box.

3. The device according to claim 2, characterized in that The static electricity generating system includes a transformer and a wire electrode; The wire electrode is a negative electrode and is made of a thin metal wire; The dust collecting plate is a metal thin plate connected to the positive electrode of the static electricity generating system.

4. The device according to claim 3, characterized in that It also includes a motor for supplying power to the controller, the fan, and the static electricity generating system; The device also includes a temperature sensor for measuring the temperature of the environment surrounding the fan and transmitting the temperature to a controller.

5. The device according to claim 4, characterized in that The controller is connected to the pressure sensor of the brake pedal and the vehicle system; The pressure sensor transmits the pressure of the brake pedal to the controller; The vehicle computer system transmits the current remaining power, current driving mode, and current braking energy recovery intensity to the controller.

6. A method for reducing brake particulate matter emissions applicable to new energy vehicles, characterized in that: A brake particulate matter reduction device for new energy vehicles according to any one of claims 1 to 5; The method is executed by a controller and includes: Obtain the current braking strength, current remaining power, current driving mode and current braking energy recovery strength of new energy vehicles; Determining a target electric field strength according to the current braking strength, the current remaining power, the current driving mode, and the current braking energy recovery strength, and controlling the electrostatic generation system to generate the target electric field strength; The target air volume is determined according to the current braking intensity, the current remaining power, the current driving mode and the current braking energy recovery intensity, and the fan is controlled to generate the target air volume.

7. The method according to claim 6, characterized in that Determine the target electric field strength E according to the following formula field : E field =B×E base ×(1+a×M+b×E+c×(1-R)); Among them, B is the current braking intensity; E base is the basic electric field strength; M is the driving mode coefficient, which is obtained by testing the number of particulate matter generated in the current driving mode; E is the normalized value of the current remaining power; R is the normalized value of the current braking recovery intensity; a, b, c are coefficients; Determine the target air volume F according to the following formula wind : F wind =B×F base ×(1+a1×M+b1×E+c1×(1-R)); Among them, F base is the basic air volume, a1, b1, c1 are coefficients.

8. The method according to claim 7, characterized in that The greater the current braking intensity, the greater the B; When the current driving mode is the economic mode, M is 0.2; when the current driving mode is the sports mode, M is 0.8; The less the current remaining power is, the smaller E is; The higher the current braking recovery intensity, the greater R.

9. The method according to claim 8, characterized in that After determining the target air volume, it also includes: If the temperature of the environment around the fan exceeds the safety threshold, the air volume adjustment factor is determined based on the temperature; Correct the target air volume F according to the adjustment factor wind ; After determining the target electric field strength, it also includes: Determine the electric field adjustment factor according to the wind volume adjustment factor; The target electric field strength E is corrected according to the electric field adjustment factor field .

10. The method according to claim 9, characterized in that In correcting the target electric field strength E field After that, it also includes: If the temperature of the environment around the fan drops to a safe threshold, the air volume adjustment factor and the electric field adjustment factor are set to zero.

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