Air conditioner fresh air system capable of controlling opening and closing of cover body based on magnetic force and control method of air conditioner fresh air system

Abstract

The invention relates to the technical field of heat pump air conditioners, in particular to an air conditioner fresh air system capable of controlling opening and closing of a cover body based on magnetic force and a control method of the air conditioner fresh air system. The magnetic suspension cover body system comprises an air outlet pipeline communicated with the wind wheel, a cover body for blocking the air outlet pipeline and a magnetic suspension driving module for driving the cover body to move, and a permanent magnet is arranged on one side of the cover body; the magnetic suspension driving module further comprises an electromagnetic driving sub-module, a detection sub-module and a control sub-module; the electromagnetic drive sub-module, the detection sub-module and the control sub-module achieve magnetic field dynamic adjustment based on real-time detection data, and non-contact movement of the cover body between a suspension opening state and a magnetic attraction closing state is controlled by changing the current direction and intensity of the electromagnetic coil set. According to the air purifier, the box cover is not limited to the vertical direction, indoor humid and dirty air is effectively removed, clean air is better provided for the interior of a room, and the better wind feeling experience is provided for a user.

Description

Technical Field

[0001] The present application relates to the technical field of heat pump air conditioners, and in particular to an air conditioning fresh air system based on magnetically controlled cover opening and closing and a control method thereof. Background Art

[0002] In recent years, heat pump air conditioners have become increasingly popular due to their advantages of energy saving and emission reduction. However, when used for a long time, the indoor environment is relatively closed and the air cannot be refreshed, which will affect the user experience. The fresh air system is the core equipment for indoor air quality control. The design of the air outlet opening and closing mechanism directly affects the uniformity of airflow distribution and human comfort experience.

[0003] Currently, some technical solutions use magnetic repulsion to achieve magnetic levitation, and their control schemes mainly rely on gravity as the source of reset power. Specifically, in a scenario where the opening and closing cover is set in a vertical direction, when the cover needs to be reset and closed, gravity is used to lower the opening and closing cover to complete the reset. However, this control scheme has a significant flaw: its reset mechanism is completely dependent on gravity, resulting in gravity being unable to provide a reset power that matches the magnetic repulsion in the structure of the fresh air vent in a non-vertical direction (such as a horizontal setting). Since the direction of gravity is always vertically downward, when the opening and closing cover is in a horizontal or other non-vertical orientation, gravity produces almost no effective component force in the reset movement direction of the opening and closing cover, making it difficult for the opening and closing cover to overcome resistance such as magnetic repulsion and achieve automatic reset and closing. This inherent defect of the existing control scheme directly leads to its use being strictly limited to the specific structure of the opening and closing cover set in a vertical direction, and it cannot adapt to the application needs of horizontal or other non-vertical fresh air vents that exist in a large number of fields such as industrial ventilation and building air conditioning. For example, in scenarios where fresh air vents need to be arranged horizontally along the wall or installed at non-vertical angles in complex piping systems, the magnetic levitation device using existing control schemes will not be able to effectively reset and close the cover, resulting in problems such as insufficient sealing, increased energy consumption, and even equipment failure, seriously affecting the practicality and reliability of the device. Summary of the Invention

[0004] In order to not be limited to the vertical opening and closing of the cover, effectively expel the moist and dirty air in the room, better provide clean air for the room, and give users a better wind feeling experience, the present application provides an air-conditioning fresh air system based on magnetic control of the opening and closing of the cover and its control method.

[0005] In the first aspect, the present application provides an air conditioning and fresh air system based on magnetically controlled cover opening and closing, which adopts the following technical solutions: An air conditioning and fresh air system based on magnetically controlled cover opening and closing, comprising: A wind wheel assembly includes a wind wheel disposed in the casing; The magnetic levitation cover system includes an air outlet duct connected to the wind wheel, a cover that blocks the air outlet duct, and a magnetic levitation drive module for driving the cover to move. A permanent magnet is provided on one side of the cover. The magnetic levitation drive module also includes: An electromagnetic drive submodule, comprising an electromagnetic coil assembly and an adjustable current source; Detection submodule, including distance sensor and magnetic field strength sensor; A control submodule, configured with a storage unit and a PID control algorithm; The electromagnetic drive submodule, the detection submodule and the control submodule realize dynamic adjustment of the magnetic field based on real-time detection data, and control the non-contact movement of the cover body between the suspended open state and the magnetic closed state by changing the current direction and intensity of the electromagnetic coil group.

[0006] By adopting the above technical solution, a magnetic levitation drive structure is used to control the opening and closing of the cover. When the fresh air system starts working, the magnetic levitation drive system is first connected to the wind wheel through the air outlet duct, and then the electromagnetic coil group is energized through the adjustable current source to generate a magnetic field. At this time, the magnetic field generated by the permanent magnet on the cover and the magnetic field generated by the electromagnetic coil group repel each other, and the permanent magnet drives the cover to move upward, opening the air outlet duct, and delivering the wind rotated by the wind wheel into the air outlet duct, thereby providing fresh air for the room; when the fresh air function is not needed, the current is controlled by the adjustable current source to input the electromagnetic coil group in the opposite direction, which is opposite to the magnetic pole of the magnetic field generated by the permanent magnet on the cover, thereby realizing magnetic attraction to close the cover. Under the action of magnetic attraction and magnetic repulsion, the box lid is not limited to opening in the vertical direction, effectively expelling the moist and dirty air in the room, better realizing the provision of clean air for the room, and giving users a better wind feeling experience.

[0007] Optionally, a mounting seat is provided on one side of the cover body, the permanent magnet is inserted into the mounting seat, a sliding groove is provided on the inner wall of the mounting seat, a plug rod is slidingly provided in the sliding groove, a connecting seat is provided at one end of the permanent magnet, the plug rod is plugged into the connecting seat, and the cover body is provided with a locking assembly for driving the plug rod to move.

[0008] By adopting the above technical solution, when the permanent magnet needs to be installed, the connecting seat on the permanent magnet is first aligned and inserted into the mounting seat, and then the insertion rod is inserted and locked into the connecting seat through the locking assembly. At this time, the permanent magnet is fixed in the mounting seat, which is conducive to improving the convenience of disassembly and assembly of the permanent magnet.

[0009] Optionally, the locking assembly includes an extrusion bolt and a spring, the spring being sleeved on the insertion rod, one end of the spring being fixedly connected to the side wall of the insertion rod, and the other end of the spring being fixedly connected to the inner wall of the slide groove, a wedge-shaped surface being provided at one end of the insertion rod, the extrusion bolt being threadedly connected to the cover body and the mounting seat in turn, the extrusion bolt extending into the slide groove, and the extrusion bolt abutting against the wedge-shaped surface.

[0010] By adopting the above technical solution, when the connecting seat on the permanent magnet is inserted into the mounting seat, the thread rotates the extrusion bolt, and the extrusion bolt drives the insertion rod to slide toward the connecting seat through the wedge surface. At this time, the insertion rod compresses the spring, and the insertion rod is inserted into the connecting seat, thereby achieving the fixation of the permanent magnet, which is beneficial to improving the stability of the permanent magnet fixed in the mounting seat.

[0011] In a second aspect, the present application provides a method for controlling the opening and closing of a cover based on magnetic force, comprising the following steps: S1: System initialization phase, the distance sensor measures the extreme displacement values ​​of the electromagnetic coil assembly and the cover in the fully open and fully closed states, and records and stores the corresponding magnetic field strength threshold and displacement reference value; S2: Start the magnetic field control command and apply a positive current to the electromagnetic coil assembly through the adjustable current source, so that it generates a repulsive magnetic field with the same polarity as the permanent magnet of the cover. At the same time, the magnetic field intensity parameters and cover displacement parameters are collected in real time. S3: Perform dynamic adjustment when the cover is opened, comparing the current displacement parameter with the stored displacement reference value: when the displacement difference is within the allowable error range, the current is maintained; when the displacement difference exceeds the positive threshold, the PID control algorithm is used to adjust the current output value until the displacement parameter meets the reference requirement; S4: updating the magnetic field control parameters, writing the current intensity, magnetic field intensity and corresponding displacement value in the steady state as new reference parameters into the non-volatile memory; S5: After receiving the closing instruction, a reverse current is applied to the electromagnetic induction coil through the adjustable current source to generate a phase attraction magnetic field, and the adjustment process described in S3 is repeated to complete the closing control.

[0012] By adopting the above technical solution, mechanical contact-free opening and closing is achieved through bipolar magnetic field control, a dynamic reference parameter update mechanism is used to ensure control accuracy in long-term use, and the PID algorithm is combined to improve the adjustment response speed.

[0013] Optionally, the PID control algorithm in step S3 specifically includes: Displacement deviation calculation module, real-time calculation of Δd=d 实际 -d 基准 ; Proportional adjustment term Kp*Δd; Integral adjustment term Ki*∫Δd dt; Differential adjustment term Kd*d(Δd) / dt; The Kp, Ki, and Kd parameters are dynamically compensated according to the electromagnet temperature parameters.

[0014] By adopting the above technical solution and introducing a temperature-compensated third-order regulation algorithm, when the temperature of the electromagnet increases and the magnetic permeability decreases, the attenuation of the magnetic field strength is compensated by increasing the Kp value; when the hysteresis loop characteristics change due to changes in ambient temperature, the Ki value is dynamically adjusted to match the new integral correction requirements; according to the change in the magnetic damping coefficient caused by the temperature change of the electromagnet, the differential action intensity is automatically optimized, thereby effectively overcoming the problem of magnetic field strength attenuation caused by the heating of the electromagnet.

[0015] Optionally, step S1 further includes: performing no less than three complete opening and closing cycle tests after the system is first run or reset, collecting multiple sets of extreme position data, and calculating the initial values ​​of the benchmark parameters by weighted averaging.

[0016] By adopting the above technical solution, the accuracy of the benchmark parameters can be improved by fusing multiple sets of data, which is conducive to eliminating accidental errors in single measurements.

[0017] Optionally, the control method further includes a fault handling step: When it is detected that the deviation between the actual displacement and the reference value continues to exceed the set time, the self-test program is started: the power supply of each electromagnet in the electromagnetic coil group is disconnected in turn, and the position of the faulty electromagnet is identified through the distance sensor.

[0018] By adopting the above technical solution, the fault location function of the magnetic levitation drive module is realized and the maintenance efficiency is improved.

[0019] Optionally, in step S4: a parameter update frequency adaptive adjustment mechanism is set, and when the ambient humidity exceeds 60% RH, the parameter update cycle is shortened to 1 / 2-1 / 3 of the standard working condition.

[0020] By adopting the above technical solution, dynamic compensation is performed for the hysteresis effect in a high-humidity environment to maintain control stability.

[0021] Optionally, the step S5 further includes: performing soft landing control in the closing stage, and reducing the magnetic field intensity gradient to 20%-30% of the standard value when the cover is less than 1 mm away from the closed position.

[0022] By adopting the above technical solution, mechanical impact when the cover is closed is avoided and the service life of the permanent magnet is extended.

[0023] Optionally, the control method further includes an energy efficiency optimization step: A three-dimensional mapping table of current, displacement and magnetic field strength is established, and the current combination with the lowest power consumption is selected according to the real-time displacement state.

[0024] By adopting the above technical solution, energy-saving control is achieved through multi-parameter optimization matching, reducing the overall power consumption of the system.

[0025] In a third aspect, a heat pump air conditioner using a magnetically controlled opening and closing cover includes the air conditioning fresh air system based on the magnetically controlled opening and closing of the cover.

[0026] By adopting the above technical solution, the stable operation of the fresh air structure of the heat pump air conditioner is effectively guaranteed, thereby ensuring the renewal of fresh air in the indoor air.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. A magnetic levitation drive structure is used to control the opening and closing of the cover. When the fresh air system starts working, the magnetic levitation drive system is first connected to the wind wheel through the air outlet duct, and then the electromagnetic coil group is energized through the adjustable current source to generate a magnetic field. At this time, the magnetic field generated by the permanent magnet on the cover and the magnetic field generated by the electromagnetic coil group repel each other. The permanent magnet drives the cover to move upward, opening the air outlet duct and delivering the wind rotated by the wind wheel into the air outlet duct, thereby providing fresh air to the room; when the fresh air function is not needed, the adjustable current source is used to control the current to be input into the electromagnetic coil group in the opposite direction to the magnetic pole of the magnetic field generated by the permanent magnet on the cover, thereby realizing magnetic attraction to close the cover. Under the action of magnetic attraction and magnetic repulsion, the box lid is not limited to opening in the vertical direction, effectively expelling the moist and dirty air in the room, better realizing the provision of clean air to the room, and giving users a better wind feeling experience; 2. Bipolar magnetic field control is used to achieve mechanical contactless opening and closing, and a dynamic reference parameter update mechanism is used to ensure control accuracy in long-term use, combined with the PID algorithm to improve the adjustment response speed; 3. Through the implementation of the above scheme, the stable operation of the fresh air structure of the heat pump air conditioner can be effectively guaranteed, thereby ensuring the renewal of fresh air in the indoor air. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a partial structural diagram of the air conditioning and fresh air system based on magnetically controlled cover opening and closing of the present application; Figure 2 This is a schematic structural diagram of the magnetic levitation drive module and the cover body of the present application; Figure 3 is a cross-sectional view of the cover and mounting base of the present application; Figure 4 This is a step diagram of the control method of the present application for controlling the opening and closing of the cover based on magnetic force.

[0029] Explanation of the accompanying reference numerals: 1. Casing; 2. Wind wheel; 3. Cover; 4. Permanent magnet; 5. Fixing bracket; 6. Electromagnetic coil assembly; 7. Mounting seat; 8. Slide groove; 9. Insert rod; 10. Connecting seat; 11. Extrusion bolt; 12. Spring; 13. Wedge surface; 14. Magnetic levitation drive module. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-4 This application is described in further detail.

[0031] First, see Figure 1 and Figure 2 A fresh air conditioning system based on magnetically controlled cover opening and closing includes a housing 1, a wind wheel assembly, and a magnetic levitation cover 3 system installed within the housing 1. The wind wheel assembly includes a wind wheel 2, which is used to draw fresh air from the outside and is installed within the housing 1. The magnetic levitation cover 3 system includes an air outlet duct fixedly connected to the air outlet end of the wind wheel 2, the cover 3 for blocking the air outlet duct, and a magnetic levitation drive module 14 for driving the cover 3 to move. The levitation surface of the cover 3 is detachably mounted with a permanent magnet 4.

[0032] The magnetic levitation drive module 14 also includes a fixed frame 5, which houses an electromagnetic drive submodule, a detection submodule, and a control submodule. The electromagnetic drive submodule is used to generate a magnetic field that attracts or repels the permanent magnet 4 and includes an electromagnetic coil assembly 6 and an adjustable current source. The detection submodule is used to detect the distance traveled by the cover 3 and the strength of the magnetic field within it, and includes a distance sensor and a magnetic field strength sensor. The control submodule is used to store detected data and control the various submodules. The control submodule is equipped with a storage unit and a PID control algorithm.

[0033] The electromagnetic drive submodule, detection submodule and control submodule realize dynamic adjustment of the magnetic field based on real-time detection data, and control the non-contact movement of the cover body 3 between the suspended open state and the magnetic closed state by changing the current direction and intensity of the electromagnetic coil group 6.

[0034] By adopting a magnetic levitation drive structure to control the opening and closing of the cover body 3, when the fresh air system starts working, the magnetic levitation drive system is first connected to the wind wheel 2 through the air outlet duct, and then the electromagnetic coil group 6 is energized by the adjustable current source to generate a magnetic field. At this time, the magnetic field generated by the permanent magnet 4 on the cover body 3 and the magnetic field generated by the electromagnetic coil group 6 repel each other, and the permanent magnet 4 drives the cover body 3 to move upward, opening the air outlet duct, and delivering the wind rotated by the wind wheel 2 into the air outlet duct, thereby providing fresh air for the room; when the fresh air function is not needed, the current is reversely input into the electromagnetic coil group 6 through the adjustable current source, which is opposite to the magnetic pole of the magnetic field generated by the permanent magnet 4 on the cover body 3, thereby realizing magnetic attraction to close the cover. Under the action of magnetic attraction and magnetic repulsion, the box lid is not limited to opening in the vertical direction, effectively expelling the moist and dirty air in the room, better realizing the provision of clean air for the room, and giving users a better wind feeling experience.

[0035] See also Figure 3 To facilitate assembly and disassembly of the permanent magnet 4, a mounting base 7 is fixedly connected to one side of the cover 3. The permanent magnet 4 is plugged into the mounting base 7. The inner wall of the mounting base 7 is formed with at least two slots 8, each of which slides a rod 9 into the slots 8. One end of the permanent magnet 4 is fixedly connected to a connecting base 10. One end of the rod 9 extends into the mounting base 7 and plugs into the connecting base 10.

[0036] In addition, to facilitate locking the insertion rod 9, the cover 3 is also equipped with a locking assembly, which includes a compression bolt 11 and a spring 12. The spring 12 is also installed in the chute 8. The spring 12 is sleeved around the insertion rod 9, with one end of the spring 12 fixedly connected to the side wall of the insertion rod 9 and the other end of the spring 12 fixedly connected to the wall of the chute 8. The compression bolt 11 is installed on the cover 3, and the fixed end of the compression bolt 11 is threadedly connected to the cover 3 and the mounting seat 7 in turn, while the fixed end of the compression bolt 11 extends into the chute 8. The end of the insertion rod 9 facing away from the connecting seat 10 is formed into a wedge-shaped surface 13, and the fixed end of the compression bolt 11 abuts against the wedge-shaped surface 13.

[0037] When the permanent magnet 4 needs to be assembled, the extrusion bolt 11 is first loosened. Under the elastic action of the spring 12, the insertion rod 9 is retracted into the slide groove 8. Then, the connecting seat 10 on the permanent magnet 4 is aligned and inserted into the mounting seat 7. After the permanent magnet 4 is completely placed in the mounting seat 7, the extrusion bolt 11 is then threaded and tightened. The extrusion bolt 11 drives the insertion rod 9 toward the connecting seat 10 through the wedge surface 13. At this time, the insertion rod 9 compresses the spring 12, the insertion rod 9 is inserted into the connecting seat 10, and the permanent magnet 4 is fixed in the mounting seat 7.

[0038] Second, see Figure 4 A control method for opening and closing a cover based on magnetic force control comprises the following steps: S1: System initialization. In this embodiment, a laser rangefinder is used as the distance sensor, and a Hall effect magnetic field sensor is used as the magnetic field strength sensor. The distance sensor measures the extreme displacement values ​​between the electromagnetic coil assembly 6 and the cover 3 in the fully open and fully closed states, and records and stores the corresponding magnetic field strength threshold and displacement reference value. S2: Start the magnetic field control command and apply a positive current to the electromagnetic coil assembly 6 through the adjustable current source, so that the electromagnetic coil assembly 6 generates a repulsive magnetic field with the same polarity as the permanent magnet 4, and at the same time collects the magnetic field intensity parameters and the displacement parameters of the cover 3 in real time; S3: Perform dynamic adjustment of cover opening and compare the current displacement parameter with the stored displacement reference value: When the displacement difference is within the allowable error range, the current is maintained; When the displacement difference exceeds the positive threshold, the PID control algorithm is used to adjust the current output value until the displacement parameter meets the benchmark requirements; S4: Update the magnetic field control parameters, and write the current intensity, magnetic field intensity and corresponding displacement value in the stable state as the new benchmark parameters into the volatile memory; S5: After receiving the closing command, a reverse current is applied to the electromagnetic induction coil through the adjustable current source to generate an attractive magnetic field, and the S3 adjustment process is repeated to complete the closing control.

[0039] The cover 3 is opened and closed without mechanical contact through bipolar magnetic field control. A dynamic reference parameter update mechanism is used during the opening and closing process to ensure control accuracy in long-term use. At the same time, the PID algorithm is combined to improve the adjustment response speed.

[0040] Specifically, step S1 also includes: after the system is first run or reset, performing an opening and closing cycle test for no less than 3 times, collecting multiple sets of extreme position data, and calculating the initial value of the benchmark parameter by weighted average.

[0041] Under multiple cycle tests, the accuracy of the benchmark parameters is improved by fusing multiple sets of data, which helps to eliminate accidental errors in single measurements.

[0042] Specifically, the PID control algorithm in step S3 specifically includes: Displacement deviation calculation module, real-time calculation of Δd=d 实际 -d 基准 ; The proportional adjustment term Kp*Δd, where the proportional coefficient Kp represents the system's response to the current displacement deviation. When a deviation (Δd) is detected between the actual displacement of the cover 3 and the reference value, a regulating force proportional to the deviation is directly generated. For example, when Δd = +2mm, Kp*2mm will output the corresponding current increment. The integral adjustment term Ki*∫Δd dt, where the integral coefficient Ki, characterizes the system's ability to correct historical accumulated deviations. The integral term ∫Δd dt eliminates steady-state errors and is particularly suitable for overcoming persistent deviations caused by hysteresis effects. For example, the constant offset caused by the residual magnetism of permanent magnet 4 after long-term operation. The differential adjustment term Kd*d(Δd) / dt, where the differential coefficient Kd represents the system's ability to predict the rate of change of displacement, suppresses overshoot by using the differential term d(Δd) / dt, and reduces the adjustment force in advance when the cover 3 rapidly approaches the target position. For example, when the cover 3 approaches the reference position at a speed of 0.5 mm / ms, a reverse damping effect is generated. The above parameters Kp, Ki, and Kd are dynamically compensated according to the temperature parameters of the electromagnet.

[0043] In the magnetically controlled lid opening and closing scenario, the dynamic compensation of the three parameters is as follows: High temperature conditions (>60°C): Increase Kp (to compensate for magnetic field attenuation), decrease Ki (to reduce the risk of integral saturation), and increase Kd (to enhance vibration suppression); Low temperature conditions (<-10°C): reduce Kp (to avoid overshoot), increase Ki (to accelerate the elimination of cold friction resistance), and reduce Kd (to prevent response hysteresis); This parameter adaptation mechanism enables the steady-state accuracy of the magnetic levitation control system (dominated by Ki) to reach ±0.05mm, and the dynamic response time (dominated by Kp / Kd) to be shortened to less than 200ms, which is significantly better than the traditional fixed-parameter PID algorithm (±0.2mm, 500ms).

[0044] A temperature-compensated third-order regulation algorithm is introduced. When the temperature of the electromagnet increases and the magnetic permeability decreases, the attenuation of the magnetic field strength is compensated by increasing the Kp value. When the hysteresis loop characteristics change due to changes in ambient temperature, the Ki value is dynamically adjusted to match the new integral correction requirements. According to the changes in the magnetic damping coefficient caused by the temperature change of the electromagnet, the differential action strength is automatically optimized, thereby effectively overcoming the problem of magnetic field strength attenuation caused by the heating of the electromagnet.

[0045] Specifically, a control method for opening and closing a cover based on magnetic force control further includes the following fault handling steps: When it is detected that the deviation between the actual displacement and the reference value continues to exceed the set time, the self-test program is started: the power supply of each electromagnet in the electromagnetic coil group 6 is disconnected in turn, and the position of the faulty electromagnet is identified through the distance sensor.

[0046] By realizing the fault location function of the magnetic levitation drive module 14, maintenance efficiency is improved.

[0047] Specifically, in step S4, a parameter update frequency adaptive adjustment mechanism is set. When the ambient humidity exceeds 605RH, the parameter update cycle is shortened to 1 / 2-1 / 3 of the standard operating condition. The specific steps include the following: S4.1: Environmental parameter monitoring: deploy humidity sensors, such as capacitive or resistive sensors, to monitor the ambient humidity value RH_actual in real time; S4.2: Humidity threshold determination: Set the reference humidity RH_actual = 60%. When RH_actual ≥ RH_threshold for 10 consecutive sampling periods, the parameter update mode is switched. S4.3: Dynamic adjustment of the update cycle. Under standard operating conditions, the parameter update cycle T_standard = 30 seconds. Under high humidity mode, the new cycle T_adapt = k*T_standard (k = 0.3-0.5); S4.4: The hysteresis compensation algorithm is activated and the following compensation operations are performed during the shortened update period: S4.4.1: Increase the number of magnetic field intensity sampling points (from the standard 50 points / cycle to 100 points); S4.4.2: Use the exponentially weighted moving average method to process magnetic field data; S4.4.3: Perform real-time calibration of the temperature drift error of the displacement sensor; S4.5: Recovery mechanism. When RH_actual is less than 55% for three consecutive cycles, the update period is gradually extended: T_new = min(T_adapt*1.5, T_standard). During the transition period, the hysteresis compensation algorithm is maintained until the standard mode is fully restored.

[0048] Specifically, step S5 further includes: performing soft landing control in the closing stage, and reducing the magnetic field intensity gradient to 20%-30% of the standard value when the cover 3 is less than 1 mm away from the closing position.

[0049] By performing soft landing control, mechanical shock when the cover 3 is closed is avoided, thereby extending the service life of the permanent magnet 4.

[0050] It is worth mentioning that the dynamic compensation for the hysteresis effect in a high-humidity environment, the temperature compensation of the PID control algorithm, and the soft landing control of the cover 3 form a technical linkage. Not only when the trigger cycle in the high-humidity environment is shortened, the weight of the Ki parameter in the temperature compensation of the PID control algorithm is synchronously adjusted (increasing the integral action intensity by 20-30%), but also in the soft landing control of the cover 3 in the closing stage, when RH ≥ 60%, the soft landing program is started 0.5mm in advance.

[0051] Specifically, a control method for opening and closing a cover based on magnetic force control further includes an energy efficiency optimization step: A three-dimensional mapping table of current, displacement, and magnetic field strength is established, and the current combination with the lowest power consumption is selected based on the real-time displacement state. The following example shows a three-dimensional mapping table when the maximum stroke is 8mm: Displacement range (mm) Optimal current combination (A) Magnetic field strength (mT) 0-2.0 [0.8，0.6，0.7，0.5] 42±3 2.0-5.0 [1.2，1.0，1.1，0.9] 68±5 5.0-8.0 [1.5，1.3，1.4，1.2] 95±7 The following is an example of test data: Under a standard environment of 25°C / 50% RH: Cover opening response time: 180ms (from command issuance to opening 8mm); position control accuracy: ±0.03mm (3σ standard deviation); steady-state power consumption: 2.8W in open state, 0.4W in closed state.

[0052] Under extreme conditions of high temperature and high humidity (60°C / 80% RH): control accuracy is maintained at ±0.07mm; the parameter update cycle is automatically shortened to 8 seconds; and the hysteresis error compensation efficiency reaches 92%.

[0053] Working principle of an air conditioning fresh air system based on magnetically controlled cover opening and closing and its control method: A magnetic levitation drive structure is used to control the opening and closing of the cover 3. When the fresh air system starts working, the magnetic levitation drive system is first connected to the wind wheel 2 through the air outlet duct, and then the electromagnetic coil group 6 is energized through the adjustable current source to generate a magnetic field. At this time, the magnetic field generated by the permanent magnet 4 on the cover 3 and the magnetic field generated by the electromagnetic coil group 6 repel each other, and the permanent magnet 4 drives the cover 3 to move upward, opening the air outlet duct, and delivering the wind rotated by the wind wheel 2 into the air outlet duct, thereby providing fresh air for the room; when the fresh air function is not needed, the current is controlled by the adjustable current source to input the electromagnetic coil group 6 in the reverse direction, which is opposite to the magnetic pole of the magnetic field generated by the permanent magnet 4 on the cover 3, thereby realizing the magnetic attraction to close the cover.

[0054] The cover 3 is opened and closed without mechanical contact through bipolar magnetic field control. A dynamic reference parameter update mechanism is used during the opening and closing process to ensure control accuracy in long-term use. At the same time, the PID algorithm is combined to improve the adjustment response speed.

[0055] To sum up, under the action of magnetic attraction and magnetic repulsion, the lid can be opened not only in the vertical direction, but also effectively removes the damp and dirty air in the room, better provides clean air indoors, and gives users a better wind experience.

[0056] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An air conditioning and fresh air system based on magnetic control of the cover opening and closing, characterized in that: include: A wind wheel assembly includes a wind wheel (2) disposed in a housing (1); A magnetic suspension cover system comprises an air outlet duct connected to a wind wheel (2), a cover (3) blocking the air outlet duct, and a magnetic suspension drive module (14) for driving the cover (3) to move, wherein a permanent magnet (4) is provided on one side of the cover (3); the magnetic suspension drive module (14) further comprises: An electromagnetic drive submodule, comprising an electromagnetic coil assembly (6) and an adjustable current source; Detection submodule, including distance sensor and magnetic field strength sensor; A control submodule, configured with a storage unit and a PID control algorithm; The electromagnetic drive submodule, the detection submodule, and the control submodule implement dynamic adjustment of the magnetic field based on real-time detection data, and control the non-contact movement of the cover body (3) between a suspended open state and a magnetically attracted closed state by changing the current direction and intensity of the electromagnetic coil group (6).

2. The air conditioning and fresh air system based on magnetically controlled cover opening and closing according to claim 1, characterized in that: A mounting seat (7) is provided on one side of the cover body (3), the permanent magnet (4) is inserted into the mounting seat (7), a sliding groove (8) is provided on the inner wall of the mounting seat (7), an insertion rod (9) is slidably provided in the sliding groove (8), a connecting seat (10) is provided at one end of the permanent magnet (4), the insertion rod (9) is inserted into the connecting seat (10), and the cover body (3) is provided with a locking component for driving the insertion rod (9) to move.

3. The air conditioning and fresh air system based on magnetically controlled cover opening and closing according to claim 2, characterized in that: The locking assembly includes an extrusion bolt (11) and a spring (12), wherein the spring (12) is sleeved on the insertion rod (9), one end of the spring (12) is fixedly connected to the side wall of the insertion rod (9), and the other end of the spring (12) is fixedly connected to the inner wall of the slide groove (8), and one end of the insertion rod (9) is provided with a wedge surface (13), and the extrusion bolt (11) is threadedly connected to the cover body (3) and the mounting seat (7) in turn, and the extrusion bolt (11) extends into the slide groove (8), and the extrusion bolt (11) abuts against the wedge surface (13).

4. A control method for opening and closing a cover body based on magnetic force control, based on an air conditioning and fresh air system based on opening and closing a cover body based on magnetic force control according to any one of claims 1 to 3, characterized in that: The steps include: S1: System initialization stage, measuring the extreme displacement values ​​of the electromagnetic coil group (6) and the cover body (3) in the fully open and fully closed states through the distance sensor, recording and storing the corresponding magnetic field intensity threshold and displacement reference value; S2: Start the magnetic field control instruction, apply a positive current to the electromagnetic coil group (6) through the adjustable current source, so that it generates a repulsive magnetic field with the same polarity as the permanent magnet (4) of the cover body (3), and at the same time collect the magnetic field intensity parameters and the displacement parameters of the cover body (3) in real time; S3: Perform dynamic adjustment when the cover is opened, comparing the current displacement parameter with the stored displacement reference value: when the displacement difference is within the allowable error range, the current is maintained; when the displacement difference exceeds the positive threshold, the PID control algorithm is used to adjust the current output value until the displacement parameter meets the reference requirement; S4: updating the magnetic field control parameters, writing the current intensity, magnetic field intensity and corresponding displacement value in the steady state as new reference parameters into the non-volatile memory; S5: After receiving the closing instruction, a reverse current is applied to the electromagnetic induction coil through the adjustable current source to generate a phase attraction magnetic field, and the adjustment process described in S3 is repeated to complete the closing control.

5. The method for controlling the opening and closing of a cover based on magnetic force control according to claim 4, characterized in that: The PID control algorithm in step S3 specifically includes: Displacement deviation calculation module, real-time calculation of Δd=d 实际 -d 基准 ; Proportional adjustment term Kp*Δd; Integral adjustment term Ki*∫Δd dt; Differential adjustment term Kd*d(Δd) / dt; The Kp, Ki, and Kd parameters are dynamically compensated according to the electromagnet temperature parameters.

6. The method for controlling the opening and closing of a cover based on magnetic force control according to claim 4, characterized in that: Said step S1 further includes: performing a complete opening and closing cycle test for not less than three times after the system is first run or reset, collecting multiple sets of extreme position data, and calculating the initial value of the reference parameter by weighted average.

7. The method for controlling the opening and closing of a cover based on magnetic force control according to claim 4, characterized in that: The control method further includes a fault handling step: When it is detected that the deviation between the actual displacement and the reference value lasts for more than a set time, the self-checking program is started: the power supply of each electromagnet in the electromagnetic coil group (6) is disconnected in turn, and the position of the faulty electromagnet is identified through the distance sensor.

8. The method for controlling the opening and closing of a cover based on magnetic force control according to claim 4, characterized in that: In step S4: a parameter update frequency adaptive adjustment mechanism is set, and when the ambient humidity exceeds 60% RH, the parameter update cycle is shortened to 1 / 2-1 / 3 of the standard working condition.

9. The method for controlling the opening and closing of a cover based on magnetic force control according to claim 4, characterized in that: The step S5 further comprises: performing soft landing control in the closing stage, and reducing the magnetic field intensity gradient to 20%-30% of the standard value when the cover (3) is less than 1 mm away from the closing position.

10. The method for controlling the opening and closing of a cover based on magnetic force control according to claim 4, characterized in that: The control method further comprises an energy efficiency optimization step: A three-dimensional mapping table of current, displacement and magnetic field strength is established, and the current combination with the lowest power consumption is selected according to the real-time displacement state.

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