Electromagnetic type semi-active three-mass flywheel damping device and control method

Abstract

The invention discloses an electromagnetic type semi-active three-mass flywheel damping device and a control method. The system comprises a DMF (Dimethyl Formamide) consisting of a dual-mass flywheel assembly and a second mass flywheel, and an eddy current damper arranged in the DMF, the eddy current damper covers the second mass flywheel; the eddy current damper is used for generating eddy current damping around the second mass flywheel; the eddy current damper weakens or eliminates torsional vibration transmitted to the second mass flywheel by the dual mass flywheel assembly through eddy current damping; the advantages of a dual-mass flywheel and an eddy current damper can be innovatively combined, the dual-mass flywheel is upgraded into a semi-active shock absorber, the damping force is indirectly controlled by adjusting electromagnetic current, the problems that a traditional DMF shock absorption working principle is single, and the frequency band is narrow are solved, the more ideal shock absorption effect is achieved, the shock absorption effect is flexible and controllable, and the shock absorption effect is good. The defects in the prior art are overcome, and the method has high application value.

Description

Technical Field

[0001] The present invention relates to the technical field of torsional vibration reduction of a power transmission system, and in particular to an electromagnetic semi-active three-mass flywheel vibration reduction device and a control method thereof. Background Art

[0002] As a core component of power machinery, the transmission system plays a key role in connecting the engine and the actuator. Its main function is to transmit motion and force. In the vehicle power transmission system, the torsional vibration generated by the engine will be transmitted to the wheels and other components through the transmission system, becoming the main source of mechanical vibration. With the continuous improvement of the power density of modern vehicle power transmission systems, the intensity of external and internal excitations has also increased, which not only increases the risk of fatigue damage to the transmission system, but also the long-term broadband vibration of the system poses a serious threat to the health of the occupants. Although it is difficult to completely eliminate the engine torsional vibration phenomenon, reducing this vibration has become a research hotspot that has attracted widespread attention from automobile manufacturers and academia.

[0003] Traditionally, the torsional vibration dampers used in vehicle power transmission systems mainly include passive devices such as clutch driven plate torsional vibration dampers, dual mass flywheel torsional vibration dampers (Dual Mass Flywheel, DMF) and Geislinger couplings. Although these passive torsional vibration dampers can reduce the torsional vibration in the torque transmission system to a certain extent, they also have the dual tasks of transmitting power torque and reducing fluctuating torque. This dual task puts forward contradictory requirements on torsional stiffness: high torsional stiffness is required to transmit large power torque, while low torsional stiffness is required to reduce fluctuating torque. This irreconcilable contradiction limits the working frequency bandwidth of passive torsional vibration dampers, making it difficult to achieve wide-band vibration reduction in torque transmission systems.

[0004] In order to solve the above problems, semi-active and active torsional vibration dampers came into being; although the active torsional vibration damper can control vibration more effectively, the active control force it requires consumes a lot of energy, resulting in a low cost-effectiveness; and although the existing semi-active torsional vibration damper combines the advantages of active and passive, its structure is complex, and the hydraulic components required for semi-active control are expensive, which to a certain extent hinders its widespread application in engineering practice; therefore, developing a new type of semi-active torsional vibration damping device and its control technology that have both vibration reduction effectiveness and structural economy has become a key technical problem that technical personnel in this field need to solve urgently.

[0005] In the existing automotive market, dual-mass flywheel torsional vibration damper (DMF) is widely used in vehicle powertrain systems because it can use changes in mass and stiffness to adjust the inherent torsional vibration characteristics of the transmission system and use damping to attenuate the system vibration amplitude. The architecture of the DMF model is shown below:Figure 1 As shown; however, as a passive vibration absorber, DMF has a large mass, limited vibration reduction effect, and a small and non-adjustable damping value; it can be seen from the amplitude-frequency characteristic curve of the existing DMF that although it can effectively reduce the vibration amplitude of the torsional component within the normal working range of the engine, there is still a large vibration amplitude in the low-frequency resonance zone, which cannot meet the vibration reduction requirements of the full frequency band.

[0006] In summary, in view of the various shortcomings of the existing torsional vibration damper, the development of a new type of semi-active torsional vibration damper and its control technology is of great significance for improving the performance of the vehicle powertrain system, protecting the health of the occupants and promoting the sustainable development of the automotive industry. Summary of the invention

[0007] The object of the present invention is to provide an electromagnetic semi-active three-mass flywheel vibration reduction device and a control method, thereby solving all or one of the above-mentioned problems existing in the prior art.

[0008] In order to solve the above technical problems, the specific technical solutions of the present invention are as follows: In one aspect, the present invention provides an electromagnetic semi-active three-mass flywheel vibration reduction device, comprising: A DMF consisting of a dual mass flywheel assembly and a second mass flywheel, and an eddy current damper arranged in the DMF; the eddy current damper is arranged to cover the second mass flywheel; The eddy current damper is used to generate eddy current damping around the second mass flywheel; the eddy current damper weakens or eliminates the torsional vibration transmitted from the dual mass flywheel assembly to the second mass flywheel through the eddy current damping.

[0009] As an improved solution, the eddy current damper comprises: a left shell, a right shell, a control module and two magnet groups arranged in sequence; The left housing and the right housing correspond to each other and are respectively arranged at two sides of the second mass flywheel; the left housing is located between the dual mass flywheel assembly and the second mass flywheel, and the control module is arranged at the other side of the right housing relative to the second mass flywheel; The two groups of magnet groups are symmetrically arranged on the inner walls of the left shell and the right shell corresponding to each other; the control module is used to supply power to the two groups of magnet groups to achieve magnetic coupling between the two groups of magnet groups; the two groups of magnet groups are used to use the magnetic coupling effect to reduce vibration of the rotating second mass flywheel.

[0010] As an improved solution, the left housing is parallel to the second mass flywheel and is transmission-sleeved on the transmission part of the dual mass flywheel assembly; The second mass flywheel is located in the left housing, and the second mass flywheel is transmission-connected to the transmission part of the dual mass flywheel assembly; The right housing transmission sleeve is arranged on the transmission shaft of the second mass flywheel, a sealed cavity is formed between the right housing and the left housing, and a gap is arranged between the second mass flywheel in the sealed cavity and the inner wall of the sealed cavity.

[0011] As an improved solution, the control module includes: a collector ring, a brush, a power supply and a controller; The collector ring is sleeved on the end of the transmission shaft of the second mass flywheel; The brush is connected to the collector ring; The power source is disposed at the proximal end of the brush and is electrically connected to the brush; The controller is disposed at the proximal end of the power source and is electrically connected to the power source; The winding wires of the two groups of magnet groups are respectively connected in parallel, and the wires are led out of the right shell to serve as two electrodes of the two groups of magnet groups; the two electrodes are respectively connected to the collector rings; The controller is used to control the power supply to supply power to the brush; the collector ring supplies power to the magnet group by contacting the brush; and the controller adjusts the eddy current damping force by controlling the intensity of the current.

[0012] On the other hand, the present invention further provides a control method for use in the electromagnetic semi-active three-mass flywheel vibration reduction device, the control method comprising the following steps: First vibration reduction step: In response to low-frequency vibrations generated by the engine, a torsional vibration damping is performed based on a dual-mass flywheel assembly; Second vibration reduction step: In response to the high-frequency vibration generated by the engine, the controller is started, and the power supply is controlled by the controller to supply power to the brush, and the power is indirectly supplied to the magnet group through the brush and the collector ring; magnetic induction lines are generated by magnetic coupling of the two groups of the magnet groups; eddy current damping force is generated when the second mass flywheel cuts the magnetic induction lines; and the torsional vibration of the second mass flywheel is attenuated by the eddy current damping force; In response to the torsional vibration attenuation degree of the second mass flywheel not meeting expectations after the controller is started, the controller is called to control the power supply to increase the intensity of the output current.

[0013] The beneficial effects of the technical solution of the present invention are: 1. The electromagnetic semi-active three-mass flywheel vibration reduction device described in the present invention innovatively combines the advantages of a dual-mass flywheel and an eddy current damper, upgrades the dual-mass flywheel to a semi-active vibration absorber, and indirectly controls the damping force by adjusting the electromagnetic current, thereby solving the problems of the traditional DMF vibration reduction having a single working principle and a narrow frequency band, achieving a more ideal vibration reduction effect, and the vibration reduction effect is flexible and controllable, making up for the defects of the prior art, and having a high application value.

[0014] 2. The control method described in the present invention can adaptively call the functional modules in the electromagnetic semi-active three-mass flywheel vibration reduction device, thereby realizing the control logic of the electromagnetic semi-active three-mass flywheel vibration reduction device described in the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 It is a schematic diagram of the existing DMF model architecture in the background technology; Figure 2 1 is a schematic diagram of the vibration reduction model architecture of the electromagnetic semi-active three-mass flywheel vibration reduction device according to Embodiment 1 of the present invention; Figure 3 It is a schematic diagram of the working principle of the eddy current damper in the electromagnetic semi-active three-mass flywheel vibration reduction device described in Example 1 of the present invention; Figure 4 is a schematic diagram of the three-dimensional structure of the electromagnetic semi-active three-mass flywheel vibration reduction device according to Example 1 of the present invention; Figure 5 It is a schematic diagram of the explosion structure of the electromagnetic semi-active three-mass flywheel vibration reduction device according to Example 1 of the present invention; Figure 6 is a schematic structural diagram of the right housing in the electromagnetic semi-active three-mass flywheel vibration reduction device described in Example 1 of the present invention from a left perspective; Figure 7 Schematic diagram of the connection structure between the electromagnet and the control module in the electromagnetic semi-active three-mass flywheel vibration reduction device according to Example 1 of the present invention; Figure 8 1 is a logic flow diagram of the electromagnetic semi-active three-mass flywheel vibration reduction control method described in Example 2 of the present invention; The symbols in the accompanying drawings are explained as follows: 1. Dual mass flywheel assembly; 101. Transmission unit; 2. Second mass flywheel; 201. Transmission shaft; 3. Eddy current damper; 301. Left shell; 302. Electromagnet; 303. Right shell; 304. Winding wire; 305. Electrode; 306. Mounting hole; 307. Collector ring; 308. Brush; 309. Power supply; 310. Controller. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0018] In the description of the present invention, it should be noted that the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0019] The terms "first", "second", etc. in the specification and claims of this article and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of this article described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0020] In the description of the present invention, it should be noted that DMF (Dual Mass Flywheel) is a dual mass flywheel.

[0021] Embodiment 1: This embodiment provides an electromagnetic semi-active three-mass flywheel vibration reduction device, such as Figure 2~Figure 7 As shown, it includes: a DMF, which is composed of a dual-mass flywheel assembly 1 and a second-mass flywheel 2; an eddy current damper 3, which is arranged in the DMF and covers the second-mass flywheel 2.

[0022] Further, if Figure 4 and Figure 5As shown, the eddy current damper 3 is composed of a left shell 301, a magnet group, a right shell 303 and a control module which are arranged in sequence, and its structural position is as follows: the left shell 301 and the right shell 303 correspond to each other, and are respectively arranged on the left and right sides of the second mass flywheel 2; the left shell 301 is located between the dual mass flywheel assembly 1 and the second mass flywheel 2, and the control module is arranged on the other side of the right shell 303 relative to the second mass flywheel 2; there are two magnet groups, and the two magnet groups are respectively symmetrically arranged on the inner walls of the left shell 301 and the right shell 303, and the inner walls are two surfaces corresponding to each other inside the left shell 301 and the right shell 303.

[0023] Furthermore, the connection relationship between the eddy current damper 3 and the DMF is as follows: the left housing 301 is parallel to the second mass flywheel 2 and is transmission-sleeved on the transmission part 101 of the dual mass flywheel assembly 1, and the second mass flywheel 2 is located in the left housing 301 and is transmission-connected to the transmission part 101 of the dual mass flywheel assembly 1; the right housing 303 is transmission-sleeved on the transmission shaft 201 of the second mass flywheel 2, and at the same time, the right housing 303 and the left housing 301 form a sealed cavity, and a certain gap is provided between the inner walls of the right housing 303 and the left housing 301 and the second mass flywheel 2 in the sealed cavity.

[0024] Furthermore, the eddy current damper 3 is an integral structure, so the edges of the right shell 303 and the left shell 301 are respectively provided with mounting holes 306 aligned with each other. Figure 6 The right housing 303 shown is provided with three mounting holes 306 , and each group of mutually aligned mounting holes 306 are fixedly connected by bolts or other connecting members.

[0025] Furthermore, the end of the transmission shaft 201 of the second mass flywheel 2 passes through the center of the right shell 303, and the control module is sleeved on the end of the transmission shaft 201 of the second mass flywheel 2 and is arranged close to the outer surface of the right shell 303; the control module is composed of a collector ring 307, a brush 308, a power supply 309 and a controller 310, the collector ring 307 is sleeved on the end of the transmission shaft 201 of the second mass flywheel 2, the brush 308 is connected to the collector ring 307, the power supply 309 is arranged at the proximal end of the brush 308 and is electrically connected to the brush 308, and the controller 310 is arranged at the proximal end of the power supply 309 and is electrically connected to the power supply 309; the collector ring 307 is electrically connected to the magnet group inside the left shell 301 and the right shell 303.

[0026] Furthermore, each magnet group is composed of four electromagnets 302, and the four electromagnets 302 are arranged on the inner wall of the shell around the center of the left shell 301 or the right shell 303; in each magnet group, the winding wires 304 of each electromagnet 302 arranged circumferentially are connected together, and the wires are led out of the shell to serve as two electrodes 305 of the electromagnet 302; finally, the electrodes 305 led out of the shell are respectively connected to the collector rings 307, and under the control of the controller 310, the collector rings 307 supply power to the electromagnet 302 by contacting with the brushes 308, and the eddy current damping force of the eddy current damper 3 can be controlled by controlling the intensity of the current.

[0027] In summary, if Figure 2 and Figure 3 As shown, in the DMF model of the present invention, the dual mass flywheel assembly 1 is J1, the second mass flywheel 2 is J2, and the eddy current damper 3 added to the DMF model is the damping C2 and the third rotational inertia J3. Finally, the damping C2 is adjusted based on the control of the energized current, thereby achieving the adjustment of the vibration reduction effect. The working principle of the present invention is as follows: When the engine generates torsional vibration and transmits it to the dual-mass flywheel assembly 1, the first vibration reduction effect is achieved based on the adjustment of the spring stiffness inside the dual-mass flywheel assembly 1, so that the torsional vibration is attenuated for the first time; When the torsional vibration generated by the engine is further transmitted to the second mass flywheel 2 through the dual mass flywheel assembly 1, secondary vibration reduction is required; at this time, the controller 310 controls the power supply 309 to supply power to the brush 308, so that the brush 308 and the collector ring 307 indirectly supply power to the electromagnet 302 inside the shell, and the two groups of magnets on the left and right sides of the shell are magnetically coupled to generate magnetic induction lines; at the same time, since the second mass flywheel 2 is constantly rotating, the second mass flywheel 2 is equivalent to a conductor plate and continuously cuts the magnetic induction lines generated by the magnets in the eddy current damper 3, thereby generating eddy current damping force on the second mass flywheel 2, achieving a second vibration reduction effect, so that the torsional vibration is attenuated for a second time, and ensuring that the power is smoothly transmitted to the subsequent gearbox; since the above-mentioned eddy current damping force can be flexibly controlled based on the controller 310, the present invention can adjust the vibration reduction effect according to the specific vibration reduction target, and has strong flexibility and applicability.

[0028] It should be noted that the above examples are only for explaining the present invention and cannot limit the protection scope of the present invention.

[0029] Embodiment 2, this embodiment is based on the same inventive concept as the electromagnetic semi-active three-mass flywheel vibration reduction device described in Embodiment 1, and provides a control method, such as Figure 8 As shown, the following steps are included: S100, a first vibration reduction step, comprising: In response to the vibration generated by the engine, the vibration frequency is relatively small, and no eddy current damper is required to intervene. Only the internal spring stiffness adjustment of the dual-mass flywheel assembly is used to achieve the torsional vibration attenuation.

[0030] S200, the second vibration reduction step, comprising: In response to the high frequency of vibration generated by the engine, the eddy current damper is activated; the controller controls the power supply to supply power to the brush, and then indirectly supplies power to the electromagnet through the brush and the collector ring, so that the two groups of magnets are magnetically coupled to generate magnetic induction lines. At this time, the second mass flywheel cuts the magnetic induction lines and generates eddy current damping force, thereby attenuating the torsional vibration of the second mass flywheel, and then outputs power to the gearbox smoothly; In response to the fact that the attenuation degree of torsional vibration after power-on does not reach the expected effect, the controller controls the power supply to increase the output current intensity, thereby increasing the magnetic induction intensity of the electromagnet, thereby increasing the eddy current damping force at the second mass flywheel and improving the vibration reduction degree.

[0031] Different from the existing technology, the electromagnetic semi-active three-mass flywheel vibration reduction device and control method of the present application can innovatively combine the advantages of the dual-mass flywheel and the eddy current damper, upgrade the dual-mass flywheel to a semi-active vibration absorber, and indirectly control the damping force by adjusting the electromagnetic current, thereby solving the problems of the traditional DMF vibration reduction working principle of a single and narrow frequency band, achieving a more ideal vibration reduction effect, and the vibration reduction effect is flexible and controllable, which makes up for the defects of the existing technology and has a high application value.

[0032] It should be understood that in the various embodiments of this document, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this document.

[0033] It should also be understood that in the embodiments of this article, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0034] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this article.

[0035] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific logical process of the method described above can refer to the corresponding working processes of the systems, devices and units in the aforementioned method embodiments, and will not be repeated here.

[0036] In the several embodiments provided herein, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or can be electrical, mechanical or other forms of connection.

[0037] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of this article.

[0038] In addition, each functional unit in each embodiment of this invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional unit.

[0039] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An electromagnetic semi-active three-mass flywheel vibration reduction device, characterized in that: include: A DMF consisting of a dual-mass flywheel assembly (1) and a second-mass flywheel (2), and an eddy current damper (3) arranged in the DMF, wherein the eddy current damper (3) is arranged to cover the second-mass flywheel (2); The eddy current damper (3) is used to generate eddy current damping around the second mass flywheel (2); the eddy current damper (3) weakens the torsional vibration transmitted from the dual mass flywheel assembly (1) to the second mass flywheel (2) through the eddy current damping.

2. The electromagnetic semi-active three-mass flywheel vibration reduction device according to claim 1, characterized in that: The eddy current damper (3) comprises: a left shell (301), a right shell (303), a control module and two groups of magnet groups which are arranged in sequence; The left housing (301) and the right housing (303) correspond to each other and are respectively arranged at two sides of the second mass flywheel (2); the left housing (301) is located between the dual mass flywheel assembly (1) and the second mass flywheel (2), and the control module is arranged at the other side of the right housing (303) relative to the second mass flywheel (2); The two groups of magnet groups are symmetrically arranged on the inner walls of the left shell (301) and the right shell (303) corresponding to each other; the control module is used to supply power to the two groups of magnet groups so that the two groups of magnet groups are magnetically coupled; the two groups of magnet groups are used to reduce vibration of the rotating second mass flywheel (2) by using the magnetic coupling effect.

3. The electromagnetic semi-active three-mass flywheel vibration reduction device according to claim 2, characterized in that: The left housing (301) is parallel to the second mass flywheel (2) and is transmission-sleeved on the transmission part (101) of the dual mass flywheel assembly (1); The second mass flywheel (2) is located in the left housing (301), and the second mass flywheel (2) is in transmission connection with the transmission part (101) of the dual mass flywheel assembly (1); The right housing (303) is transmission-sleeved on the transmission shaft (201) of the second mass flywheel (2), a sealed cavity is formed between the right housing (303) and the left housing (301), and a gap is provided between the second mass flywheel (2) in the sealed cavity and an inner wall of the sealed cavity.

4. The electromagnetic semi-active three-mass flywheel vibration reduction device according to claim 3 is characterized in that: The control module comprises: a collector ring (307), a brush (308), a power supply (309) and a controller (310); The collector ring (307) is sleeved on the end of the transmission shaft (201) of the second mass flywheel (2); The brush (308) is connected to the slip ring (307); The power source (309) is arranged at the proximal end of the brush (308) and is electrically connected to the brush (308); The controller (310) is disposed at the proximal end of the power source (309) and is electrically connected to the power source (309); The winding wires (304) of the two groups of magnet groups are respectively connected in parallel and led out of the right shell (303) to serve as two electrodes (305) of the two groups of magnet groups; the two electrodes (305) are respectively connected to the collector rings (307); The controller (310) is used to control the power supply (309) to supply power to the brush (308); the collector ring (307) supplies power to the magnet group by contacting the brush (308); and the controller (310) adjusts the eddy current damping force by controlling the intensity of the energized current.

5. A control method, used in the electromagnetic semi-active three-mass flywheel vibration reduction device according to any one of claims 1 to 4, characterized in that: The control method comprises the following steps: First vibration reduction step: In response to low-frequency vibrations generated by the engine, a torsional vibration damping is performed based on a dual-mass flywheel assembly; Second vibration reduction step: In response to the high-frequency vibration generated by the engine, the controller is started, and the power supply is controlled by the controller to supply power to the brush, and the power is indirectly supplied to the magnet group through the brush and the collector ring; magnetic induction lines are generated by magnetic coupling of the two groups of the magnet groups; eddy current damping force is generated when the second mass flywheel cuts the magnetic induction lines; and the torsional vibration of the second mass flywheel is attenuated by the eddy current damping force; In response to the torsional vibration attenuation degree of the second mass flywheel not meeting expectations after the controller is started, the controller is called to control the power supply to increase the intensity of the output current.

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