CN117869526A

CN117869526A - Semi-active hydraulic suspension, control method thereof and vehicle

Info

Publication number: CN117869526A
Application number: CN202311692189.0A
Authority: CN
Inventors: 高远; 赵楠楠
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2023-12-11
Filing date: 2023-12-11
Publication date: 2024-04-12

Abstract

The invention discloses a semi-active hydraulic suspension, a control method thereof and a vehicle, and relates to the field of vehicles; wherein, one end of the rubber main spring in the first direction is provided with a mounting structure which can be connected with the power assembly; the rubber bottom film is connected with the other end of the rubber main spring in the first direction and encloses a closed liquid chamber; the flow channel structure separates the airtight liquid chamber into a first liquid chamber and a second liquid chamber which are distributed along a first direction, the flow channel structure comprises a shell and a decoupling film, the shell is provided with an inertia channel and a mounting hole, the inertia channel is respectively communicated with the first liquid chamber and the second liquid chamber, the mounting hole respectively penetrates through two opposite surfaces of the shell in the first direction, and the decoupling film is made of a magneto-sensitive rubber material and is arranged in the mounting hole; the magnetic deformation piece is arranged around the central axis of the rubber main spring and is connected with the rubber main spring, and the magnetic deformation piece is positioned at one side of the rubber main spring close to the mounting structure; the electromagnetic structure can generate magnetic force action on the decoupling film and the magnetic deformation piece. The invention has large adjustable range of rigidity and damping, and can meet the higher NVH performance requirement of the whole vehicle.

Description

Semi-active hydraulic suspension, control method thereof and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a semi-active hydraulic suspension, a control method thereof and a vehicle.

Background

Suspension is an automotive powertrain for reducing and controlling the transmission of engine vibrations and for supporting, and is widely used in the current automotive industry. Among them, the widely used suspensions include the conventional pure glue suspensions, and the hydraulic suspensions with better dynamic and static properties.

At present, with development and popularization of electric automobiles, the requirements of the public on vehicle NVH (Chinese name is noise, vibration and harshness, english is Noise, vibration, harshness) and control are gradually increased, and the design requirements of the suspension vibration isolation system serving as an important vibration isolation system of the vehicle are also gradually increased. The common hydraulic suspension can not meet the performance requirements of the vehicle gradually, but the semi-active suspension has higher performance, can meet the performance requirements of the vehicle under various working conditions, and becomes an important direction of design and development of a power assembly suspension system of each automobile host factory gradually. The existing semi-active suspension can realize adjustable rigidity and damping, but has complex structure and narrow adjustable rigidity and damping range.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the semi-active hydraulic suspension is simple in structure, capable of adjusting rigidity and damping, wide in adjustable range of rigidity and damping, capable of meeting higher NVH performance requirements of the whole vehicle, and capable of improving vehicle operability.

The invention also provides a control method applied to the semi-active hydraulic suspension.

The invention also provides a vehicle with the semi-active hydraulic suspension.

Embodiments of the first aspect of the present invention provide a semi-active hydraulic mount comprising:

a rubber main spring having a central axis extending in a first direction, one end of the rubber main spring in the first direction being provided with a mounting structure for connection with the power assembly;

the rubber bottom film is connected with the other end of the rubber main spring in the first direction and encloses a closed liquid chamber together;

the flow passage structure is arranged in the closed liquid chamber and divides the closed liquid chamber into a first liquid chamber and a second liquid chamber which are arranged along a first direction, the flow passage structure comprises a shell and a decoupling film, the shell is provided with an inertia passage and a mounting hole, the inertia passage is respectively communicated with the first liquid chamber and the second liquid chamber, the mounting hole respectively penetrates through two opposite surfaces of the shell in the first direction, and the decoupling film is made of a magnetic-sensitive rubber material and is arranged in the mounting hole;

the magnetic deformation piece is arranged around the central axis of the rubber main spring and connected with the rubber main spring, and is positioned at one side of the rubber main spring close to the mounting structure;

And the electromagnetic structure is used for generating magnetic force action on the decoupling film and the magnetic deformation piece.

The semi-active hydraulic suspension according to the embodiment of the first aspect of the invention has at least the following beneficial effects: when the electromagnetic structure is electrified to generate a magnetic field, the magnetically deformable piece deforms under the action of the magnetic field and causes the rigidity of the rubber main spring to be increased, and meanwhile, the decoupling film also generates rigidity to be increased under the action of the magnetic field, so that the damping and rigidity of the semi-active hydraulic suspension are increased; when the electromagnetic structure is powered off and the magnetic field disappears, the magnetic deformation piece can restore to the original state, the rigidity of the rubber main spring is reduced to the original design rigidity, and meanwhile, the rigidity of the decoupling film is reduced, so that the damping and rigidity of the semi-active hydraulic suspension are reduced.

Compared with the existing semi-active hydraulic suspension, the semi-active hydraulic suspension provided by the embodiment of the invention can realize variable rigidity and damping through the mutual matching of the electromagnetic structure, the magnetically deformable piece on the rubber main spring and the decoupling film made of the magnetically sensitive rubber material, has a large adjustable range of rigidity and damping, can provide better NVH performance requirements of the whole vehicle, and can improve the vehicle operability.

In some embodiments of the present invention, the magnetic deformation member is made of magnetostrictive material, the magnetic deformation member has an annular structure, and a central axis of the magnetic deformation member coincides with a central axis of the rubber main spring.

In some embodiments of the invention, the magnetically deformable member is vulcanization bonded to the rubber main spring, and the rubber main spring encases the magnetically deformable member.

In some embodiments of the present invention, the semi-active hydraulic suspension further includes a protective case, the rubber main spring includes a first main spring portion and a second main spring portion connected along a first direction, one end of the first main spring portion away from the second main spring portion is provided with the mounting structure and the magnetically deformable member, the first main spring portion is in a horn shape, an outer diameter of the first main spring portion decreases from the second main spring portion toward the mounting structure, a stretching direction of the magnetically deformable member is parallel to a side wall extending direction of the first main spring portion, the protective case has a receiving groove with an opening facing the first main spring portion, the second main spring portion and the rubber bottom film are both disposed in the receiving groove, the second main spring portion is connected with an inner peripheral wall surface of the receiving groove, and the first main spring portion is partially disposed in the receiving groove and connected with the inner peripheral wall surface of the receiving groove.

In some embodiments of the invention, the mounting structure is provided with a mounting cavity, the electromagnetic structure is provided within the mounting cavity, and a magnetic field direction of the electromagnetic structure extends along a first direction.

In some embodiments of the present invention, the mounting structure includes an aluminum core and a connecting member, the aluminum core is connected with the rubber main spring, an axial direction of the connecting member extends along a first direction, the connecting member is connected with the aluminum core, an end of the connecting member, which is far away from the rubber bottom film, is a connecting end for connecting the power assembly, the electromagnetic structure includes a coil, the coil is wound around a circumferential surface of the connecting member, and a central axis of the coil, a central axis of the decoupling film and a central axis of the rubber main spring are coincident.

In some embodiments of the present invention, the aluminum core is in a truncated cone shape, and the outer diameter of the aluminum core is reduced from the rubber main spring toward the rubber base film, and the expansion and contraction direction of the magnetic deformation member is perpendicular to the outer peripheral wall surface of the aluminum core.

In some embodiments of the present invention, the semi-active hydraulic suspension further includes an inner shell and a limiting structure, the inner shell is disposed in the closed liquid chamber and is located at a side of the flow channel structure, which is close to the connecting piece, a through hole is disposed in a middle position of the inner shell, the through hole penetrates through two opposite sides of the inner shell in the first direction, the limiting structure is located at a side of the through hole, which is close to the flow channel structure, and is connected to one end of the connecting piece, which is close to the flow channel structure, the limiting structure is in elastic contact with the inner shell and covers the through hole, and the limiting structure and the inner shell separate the first liquid chamber into a first subchamber and a second subchamber, which are arranged along the first direction.

In some embodiments of the present invention, the limiting structure includes an elastic portion and a skeleton, the elastic portion is wrapped around the skeleton, and the elastic portion is in elastic contact with the inner shell.

An embodiment of a second aspect of the present invention provides a method for controlling a semi-active hydraulic suspension, which is applied to the semi-active hydraulic suspension according to the embodiment of the first aspect, and includes the following steps:

acquiring an input instruction and determining a current driving mode of the vehicle, wherein the driving mode comprises a normal driving mode, a comfortable driving mode and a sport driving mode;

if the vehicle is in the normal driving mode, when the vehicle speed is smaller than a set value, controlling the electromagnetic structure to lose electricity; when the vehicle is greater than or equal to a set value, controlling the electromagnetic structure to obtain electricity;

if the vehicle is in a comfortable driving mode, controlling the electromagnetic structure to lose electricity;

and if the vehicle is in the motion driving mode, controlling the electromagnetic structure to obtain electricity.

The control method of the semi-active hydraulic suspension according to the embodiment of the second aspect of the invention has at least the following beneficial effects: when the current driving mode of the vehicle is selected as the conventional driving mode, the vehicle speed condition needs to be judged, if the vehicle speed is smaller than a set value, the electromagnetic structure is controlled to lose electricity, and the rigidity and the damping of the semi-active hydraulic suspension are reduced to the minimum, so that the NVH performance requirements under the working conditions of starting, flameout and creeping are met, otherwise, the electromagnetic structure is controlled to lose electricity, the rigidity and the damping of the semi-active hydraulic suspension are improved, and the NVH performance requirements under the impact working condition are met; when the current driving mode of the vehicle is selected as a comfortable driving mode, controlling the electromagnetic structure to lose electricity, reducing the rigidity and the damping of the semi-active hydraulic suspension, and enabling the vehicle to have good NVH performance; when the current driving mode of the vehicle is selected as a motion driving mode, the power supply of the electromagnetic structure is controlled, so that the rigidity and the damping of the semi-active hydraulic suspension are increased, and the vehicle has good operability.

Embodiments of a third aspect of the present invention provide a vehicle comprising a semi-active hydraulic suspension as described in the embodiments of the first aspect.

According to the vehicle of the embodiment of the third aspect of the invention, at least the following beneficial effects are achieved: the semi-active hydraulic suspension with the structure can be used for enabling the vehicle to meet performance requirements of different working conditions by adjusting rigidity and damping of the semi-active hydraulic suspension, and better operability is provided.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

FIG. 1 is a schematic cross-sectional view of a semi-active hydraulic mount provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a connection between a mounting structure and an electromagnetic structure in a semi-active hydraulic suspension provided in accordance with an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a rubber main spring in a semi-active hydraulic suspension provided according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a flow channel structure in a semi-active hydraulic suspension according to an embodiment of the present invention;

FIG. 5 is a schematic exploded view of a runner structure in a semi-active hydraulic mount according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view of a connection between a limit structure and an inner housing in a semi-active hydraulic mount according to an embodiment of the present invention;

fig. 7 is a flow chart of a method for controlling a semi-active hydraulic mount according to an embodiment of the present invention.

Reference numerals: 100. a mounting structure; 110. an aluminum core; 111. a first peripheral wall surface; 120. a connecting piece; 121. a connection end; 122. a threaded portion; 200. a rubber main spring; 201. a first main spring portion; 202. a second main spring portion; 210. a mounting groove; 211. a second peripheral wall surface; 220. a first cavity; 230. a clamping cavity; 310. a housing; 320. a bottom case; 400. a coil;

510. an inner case; 511. a second cavity; 512. a through hole; 520. a limit structure; 521. an elastic part; 522. a skeleton; 523. a through hole; 530. a nut; 600. a magnetically deformable member; 710. a first subchamber; 720. a second subchamber; 730. a second liquid chamber; 800. a flow channel structure; 810. a decoupling film; 820. a first sub-shell; 821. an opening structure; 822. a first opening; 830. a second sub-shell; 831. a groove; 832. a second opening; 840. a housing; 841. an inertial pathway; 842. a mounting hole; 900. and a rubber base film.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

Because of the rapid development and popularization of electric automobiles, the requirements of masses on vehicle NVH performance and control are improved, the design requirements of vehicle suspension are also improved, and the performance requirements of vehicles cannot be met gradually by common hydraulic suspension, so that the hydraulic suspension with better performance needs to be developed. The semi-active hydraulic suspension has higher performance, can meet the performance requirements of vehicles under various working conditions, and has become an important research direction in the field of automobiles. The semi-active hydraulic suspension on the market at present has the function of adjusting rigidity and damping, however, the structure of the semi-active hydraulic suspension is complex, and the adjustable range of the rigidity and the damping is small, so that the NVH performance requirement of a higher whole vehicle cannot be well met.

Based on the problems, the embodiment of the invention provides a semi-active hydraulic suspension, a control method thereof and a vehicle, wherein the semi-active hydraulic suspension has the advantages of simple structure, small occupied space, durability and reliability, can realize adjustable rigidity and damping, has wide adjustable range of rigidity and damping, can meet higher NVH performance requirements of the whole vehicle, and can improve the operability of the vehicle.

A semi-active hydraulic mount, a control method thereof, and a vehicle according to an embodiment of the present invention are described below with reference to fig. 1 to 7.

As shown in fig. 1 to 6, the semi-active hydraulic mount according to the embodiment of the present invention has a first direction and a second direction, wherein the first direction and the second direction are perpendicular. In the present embodiment, the power assembly (i.e., the engine) is located above the semi-active hydraulic mount based on the installation condition of the semi-active hydraulic mount, and therefore, the first direction is assumed to be the up-down direction, and the second direction is assumed to be the left-right direction.

The semi-active hydraulic suspension structure comprises a rubber main spring 200, a protective shell, a rubber bottom film 900, a runner structure 800, a magnetic deformation piece 600 and an electromagnetic structure.

The central axis of the rubber main spring 200 extends along the first direction, the rubber main spring 200 is provided with a mounting structure 100, the mounting structure 100 is located at one end of the rubber main spring 200 in the first direction, and the mounting structure 100 is used for being connected with a power assembly, so that the semi-active hydraulic suspension can be mounted on the power assembly. In the present embodiment, the mounting structure 100 is fixedly coupled to the upper end of the rubber main spring 200.

The rubber base film 900 is fixedly connected to the other end of the rubber main spring 200 in the first direction, and the rubber base film 900 and the rubber main spring 200 together enclose a closed liquid chamber. The closed liquid chamber provides a sealed accommodation space for the liquid. It will be appreciated that the liquid may be injected into the closed liquid chamber by a vacuum filling technique, such that the closed liquid chamber is filled with liquid. The liquid may be ethylene glycol. In the present embodiment, the rubber base film 900 is fixedly coupled to the lower end of the rubber main spring 200.

The protective case has the holding tank, and the opening of holding tank is towards mounting structure 100, and rubber backing film 900 is established in the holding tank, and rubber main spring 200 part is established in the holding tank, and mounting structure 100 is located outside the holding tank, and rubber backing film 900 and rubber main spring 200 are all connected with the protective case, and the protective case can provide the guard action to rubber backing film 900 and first liquid room and the second liquid room 730 that are enclosed jointly by rubber backing film 900 and rubber main spring 200, and moreover, the protective case can be installed at the automobile body through the bolt. In this embodiment, the bottom surface of the accommodating groove is provided with an air hole, and a certain space is provided between the rubber bottom film 900 and the bottom surface of the accommodating groove, and the air in the space can enter and exit the air hole in the deformation process of the rubber bottom film 900.

In this embodiment, the protective case includes a housing 310 and a bottom case 320, the bottom case 320 is located below the housing 310, and the housing 310 and the bottom case 320 are connected and form a receiving groove together. The inner peripheral surface of the housing 310 is connected to the rubber main spring 200.

The flow channel structure 800 is disposed in the sealed liquid chamber, and an outer peripheral surface of the flow channel structure 800 is connected with an inner peripheral surface of the sealed liquid chamber, so that the flow channel structure 800 can divide the sealed liquid chamber into two liquid chambers, namely a first liquid chamber and a second liquid chamber 730, wherein the first liquid chamber and the second liquid chamber 730 are arranged along a first direction. The first liquid chamber is disposed adjacent to the mounting structure 100 and the second liquid chamber 730 is disposed adjacent to the rubber base film 900. It is understood that the shape and size of the first liquid chamber and the second liquid chamber 730 may be different, and they may be set according to actual situations.

In this embodiment, the first liquid chamber is located above the second liquid chamber 730. The rubber main spring 200 and the runner structure 800 together define a first liquid chamber, and the rubber base membrane 900 and the runner structure 800 together define a second liquid chamber 730.

The flow path structure 800 includes a housing 840 and a decoupling membrane 810. Wherein the housing 840 is provided with an inertia track 841. The inertia track 841 has two openings, one of which communicates with the first liquid chamber and the other of which communicates with the second liquid chamber 730, so that the inertia track 841 can communicate with the first liquid chamber and the second liquid chamber 730, respectively, and liquid in the closed liquid chamber can flow back and forth in the inertia track 841. It will be appreciated that the shape and size of the inertia track 841 may be set according to the actual situation, and is not particularly limited herein. In this embodiment, the inertia track 841 is spiral.

The housing 840 is further provided with mounting holes 842, wherein a central axis of the mounting holes 842 extends along the first direction, and the mounting holes 842 penetrate through two opposite surfaces of the housing 840 in the first direction, respectively, so that the mounting holes 842 are communicated with the first liquid chamber and the second liquid chamber 730, respectively. The decoupling film 810 is a magnetically sensitive rubber material, and the decoupling film 810 is disposed within the mounting hole 842 of the housing 840. In this embodiment, the flow channel structure 800 and the decoupling film 810 are both flat, and the housing 840 is circular when viewed along the first direction, and the decoupling film 810 is also circular. The upper and lower dimensions (i.e., thickness) of the decoupling film 810 are smaller than the upper and lower dimensions of the mounting hole 842, and thus, a damping cavity is commonly formed between the surface of the decoupling film 810 and the inner circumferential surface of the mounting hole 842. The decoupling film 810 made of a magnetically sensitive rubber material is disposed at the mounting hole 842 of the housing 840 such that the liquid in the first liquid chamber is in contact with the upper surface of the decoupling film 810 and the liquid in the second liquid chamber 730 is in contact with the lower surface of the decoupling film 810.

The magnetic deforming member 600 is disposed around the central axis of the rubber main spring 200, the magnetic deforming member 600 is fixedly connected with the rubber main spring 200, and the magnetic deforming member 600 is located at one side of the rubber main spring 200 near the mounting structure 100.

It will be appreciated that the amount of deformation of the magnetic deforming member 600 is affected by the magnitude of the magnetic field, and that the larger the magnetic field strength, the larger the amount of deformation of the magnetic deforming member 600. In one example, the number of the magnetic deforming members 600 may be one, and have a ring structure, and the central axes of the magnetic deforming members 600 are disposed to extend along the first direction, and thus, the magnetic deforming members 600 are disposed around the central axis of the rubber main spring 200 such that the central axis of the magnetic deforming members 600 coincides with the central axis of the rubber main spring 200. In other examples, the number of the magnetic deforming members 600 may be two, three or more, and all the magnetic deforming members 600 are annularly arranged around the central axis of the rubber main spring 200, so that all the magnetic deforming members 600 are uniformly distributed on the rubber main spring 200, and each magnetic deforming member 600 may have an arc shape.

The electromagnetic structure functions to magnetically act on the decoupling film 810 and the magnetic deforming member 600. It is understood that the electromagnetic structure is a device for generating electromagnetic force by energizing, specifically an electromagnet. The hardness of the decoupling film 810 is changed under the influence of the magnetic field generated by the electromagnetic structure, and the deformation amount of the magnetic deformation member 600 is changed.

In some embodiments, a split design is employed between the electromagnetic structure and the protective case, i.e., the electromagnetic structure may be mounted independently, such as on the vehicle body, below or to the left of the protective case. In other embodiments, the electromagnetic structure is coupled to the housing, e.g., may be mounted below or to the left of the housing. In other embodiments, the electromagnetic structure may be disposed inside the mounting structure 100.

It will be appreciated that the rubber main spring 200 is not only capable of withstanding the static and dynamic loads of the powertrain, but also acts like a pumping piston, such that fluid is damped between the first fluid chamber and the second fluid chamber 730 through the inertia track 841, thereby dissipating vibrational energy from the powertrain.

When the vehicle runs at a low speed, the rubber main spring 200 is compressed under a low frequency and large amplitude, at this time, the stiffness of the decoupling film 810 is large, the volume of the first liquid chamber is reduced, so that the liquid in the first liquid chamber flows into the second liquid chamber 730 through the inertia channel 841 under the pressure action, flow loss and throttling loss can be generated in the process, a large damping effect is generated, and excitation energy is attenuated, so that low frequency and large vibration from the power assembly is effectively attenuated, large displacement of the power assembly is limited, and riding comfort of the vehicle is further improved.

When the vehicle runs at a high speed, the power assembly can vibrate at a high frequency and a small amplitude, at this time, the rigidity of the decoupling film 810 is small, and the liquid cannot flow in the inertia passage 841, so that the decoupling film 810 can deform and drive the liquid around the decoupling film (such as a damping cavity) to move, so that the pressure is dynamically balanced, the vibration isolation requirement of the power assembly is realized, and the high-frequency noise is effectively suppressed.

When the semi-active hydraulic suspension of the embodiment is used, the rigidity and the damping of the semi-active hydraulic suspension can be adjusted by controlling the power on and power off of the electromagnetic structure and adjusting the rigidity of the decoupling film 810 and the deformation of the magnetic deformation piece 600, and meanwhile, compared with the existing semi-active hydraulic device, the adjustable range of the rigidity and the damping can be improved.

When the electromagnetic structure is electrified to generate a magnetic field, the magnetic deformation piece 600 is deformed under the action of the magnetic field, so that the rigidity of the rubber main spring 200 is increased, and meanwhile, the decoupling film 810 is also subjected to the action of the magnetic field to generate rigidity, so that the damping and rigidity of the semi-active hydraulic suspension are increased; when the electromagnetic structure is powered off and the magnetic field is removed, the magnetic deformation member 600 will recover to the original state, the rigidity of the rubber main spring 200 is reduced to the original design rigidity, and at the same time, the rigidity of the decoupling film 810 is reduced, so that the damping and rigidity of the semi-active hydraulic suspension are reduced.

The non-contact mode is adopted between the electromagnetic structure and the magneto-deformable member 600 and between the electromagnetic structure and the decoupling film 810, and compared with the structural design adopting the air cavity and the electromagnetic valve to be matched with the decoupling film 810 and the structural design adopting the electromagnetic actuator to be connected with the decoupling film 810, the semi-active hydraulic suspension provided by the embodiment of the invention has the advantages of simple structure, easiness in assembly, stability and reliability and low failure rate.

Compared with the existing semi-active hydraulic suspension, the semi-active hydraulic suspension provided by the embodiment of the invention can realize variable rigidity and damping through the mutual matching of the electromagnetic structure, the magnetically deformable piece 600 on the rubber main spring 200 and the decoupling film 810 made of the magnetically sensitive rubber material, has a large adjustable range of rigidity and damping, can provide better NVH performance requirements of the whole vehicle, and can improve the vehicle operability.

In a preferred embodiment, as shown in fig. 1, the magnetic deformation member 600 is made of magnetostrictive material, the magnetic deformation member 600 has a ring structure, and the central axis of the magnetic deformation member 600 extends along the first direction and coincides with the central axis of the rubber main spring 200.

It will be appreciated that as the magnetic field strength increases, the magnetostrictive effect of the magnetic deformation 600 increases, i.e., the elongation of the magnetic deformation 600 increases. With the above arrangement, the force from the magnetic deforming member 600 applied to the rubber main spring 200 at each place in the circumferential direction thereof is made uniform.

Further, the magnetic deformation member 600 is vulcanized and connected with the rubber main spring 200, and the rubber main spring 200 covers the magnetic deformation member 600, so that the magnetic deformation member 600 can be protected from being exposed.

In a specific example, as shown in fig. 1 and 3, the rubber main spring 200 includes a first main spring portion 201 and a second main spring portion 202, where the first main spring portion 201 and the second main spring portion 202 are arranged along a first direction, and are connected by an integral molding process. In the present embodiment, the first main spring portion 201 is located above the second main spring portion 202.

The mounting structure 100 and the magnetic deforming member 600 are provided at one end of the first main spring 201 away from the second main spring 202, the first main spring 201 has a horn shape, and the outer diameter of the first main spring 201 changes along the first direction, specifically, the outer diameter of the first main spring 201 decreases from the second main spring 202 toward the mounting structure 100. The side wall of the first main spring portion 201 is inclined from a sectional view, and an upper portion of the side wall is closer to the central axis of the first main spring portion 201 than a lower portion. The sidewall thickness of the first main spring portion 201 is greater than the sidewall thickness of the second main spring portion 202.

The magnetic deforming member 600 is provided in the side wall of the first main spring portion 201, and is in a wrapped state. Further, the longitudinal expansion and contraction direction of the magnetic deforming member 600 is parallel to the side wall extending direction of the first main spring portion 201. From a cross-sectional view, the dimension of the magnetic deforming member 600 in the side wall thickness direction of the first main spring portion 201 is greater than or equal to the thickness dimension of the side wall of the first main spring portion 201.

The holding groove of the protective case has an opening that is opened toward the first main spring portion 201, the second main spring portion 202 and the rubber base film 900 are both provided in the holding groove, the second main spring portion 202 is connected with the inner peripheral wall surface of the holding groove, and the first main spring portion 201 is partially provided in the holding groove and connected with the inner peripheral wall surface of the holding groove.

It can be appreciated that, by adopting the above structural design, the magnetic deformation member 600 can be extended or shortened to the original state along the extending direction of the side wall of the first main spring portion 201, and the rigidity of the rubber main spring 200 is adjusted by fully utilizing the length variation of the magnetic deformation member 600, so that the material consumption of the magnetic deformation member 600 is reduced, and the power of the electromagnetic structure is reduced.

In a preferred embodiment, as shown in fig. 1 and 2, the mounting structure 100 is provided with a mounting cavity, the electromagnetic structure is provided in the mounting cavity, and the magnetic field direction of the electromagnetic structure extends in the first direction.

By the arrangement, the internal space of the mounting structure 100 can be effectively utilized, so that the structure of the semi-active hydraulic suspension is more compact, and the occupied space of the semi-active hydraulic suspension is reduced. Moreover, since the decoupling film 810 is farther from the mounting structure 100 than the magneto-deformable member 600, when the magnetic field direction of the electromagnetic structure extends along the first direction and is perpendicular to the end surface of the decoupling film 810, the stiffness change of the decoupling film 810 can be made more obvious under a certain magnetic field strength, thereby being beneficial to significantly adjusting the stiffness and damping of the semi-active hydraulic suspension.

In one example, as shown in fig. 1 and 2, the mounting structure 100 includes an aluminum core 110 and a connector 120. The aluminum core 110 is connected with the rubber main spring 200, for example, the outer surface of the aluminum core 110 is connected with the rubber main spring 200 through a vulcanization process. The axial direction of the connection member 120 extends along the first direction, and the connection member 120 is fixedly connected with the aluminum core 110, such as by a bolt, a rotary buckle, or welding. The end of the connecting member 120 away from the rubber base film 900 is a connecting end 121 for connecting the power assembly, and the connecting end 121 can be connected with the power assembly through a threaded structure. After the mounting structure 100 is coupled to the power assembly, both the connector 120 and the aluminum core 110 are in contact with the power assembly. The connection member 120 may be a cylinder made of a metal material such as aluminum.

The electromagnetic structure comprises a coil 400, the coil 400 is wound around the peripheral surface of the connecting piece 120, both ends of the coil 400 are electric terminals, and the coil 400 can be connected with an external power supply, so that the coil 400 can be electrified and generate a magnetic field. The central axis of the coil 400, the central axis of the decoupling film 810 and the central axis of the rubber main spring 200 coincide, and the central axis of the rubber main spring 200 coincides with the central axis of the ring-shaped magnetic deforming member 600.

When the coil 400 is electrified, a magnetic field is generated, the magnetic deformation piece 600 deforms and stretches under the action of the magnetic field, the rubber main spring 200 is influenced by the deformation of the magnetic deformation piece 600, and the rigidity is increased; at the same time, the decoupling film 810 is subjected to a magnetic field to become stiffer, resulting in greater damping of the semi-active hydraulic suspension.

When the coil 400 is powered off, the magnetic field disappears, the magnetic deformation 600 returns to the original state, the rigidity of the rubber main spring 200 decreases, and the original design rigidity is maintained; at the same time, the stiffness of the decoupling film 810 becomes smaller, resulting in less damping of the semi-active hydraulic mount.

By such arrangement, the hardness of the decoupling film 810 can be significantly changed, and at the same time, the magnetic field intensity applied to the magnetic deformation member 600 in each position in the circumferential direction is uniform, and the length change amount of the magnetic deformation member 600 is uniform, thereby realizing uniform rigidity change of the rubber main spring 200.

In a specific example, as shown in fig. 1 to 3, the aluminum core 110 has a truncated cone shape, and the outer diameter of the aluminum core 110 becomes smaller from the rubber main spring 200 toward the rubber base film 900, and the expansion and contraction direction of the magnetic deforming member 600 is perpendicular to the outer circumferential wall surface of the aluminum core 110. In the present embodiment, the outer diameter of the aluminum core 110 becomes smaller from top to bottom.

The rubber main spring 200 is provided with an upwardly opened mounting groove 210, and the shape of the mounting groove 210 is matched with the shape of the aluminum core 110. The aluminum core 110 has a first peripheral wall surface 111 inclined in a sectional view, and the mounting groove 210 has a second peripheral wall surface 211 inclined, and the first peripheral wall surface 111 and the second peripheral wall surface 211 are fitted to each other. When the power assembly vibrates, the vibration is transmitted to the rubber main spring 200 through the aluminum core 110, and because the length expansion and contraction direction of the magnetic deformation member 600 is perpendicular to the first peripheral wall surface 111 and the second peripheral wall surface 211 and parallel to the extending direction of the side wall of the rubber main spring 200, the direction of the vibration acting on the side wall of the rubber main spring 200 is parallel to the extending direction of the side wall of the rubber main spring 200, therefore, the rigidity of the rubber main spring 200 can be effectively increased by fully utilizing the elongation of the magnetic deformation member 600, and the large displacement of the power assembly can be effectively limited, thereby improving the vibration damping effect of the semi-active hydraulic suspension.

In some embodiments, as shown in fig. 1-3 and 6, the semi-active hydraulic mount structure further includes an inner housing 510 and a limiting structure 520.

The inner housing 510 is disposed in the sealed liquid chamber, the inner housing 510 is disposed at a side of the flow channel structure 800 near the connecting member 120, and a through hole 512 is disposed in a middle portion of the inner housing 510, and the through hole 512 penetrates through two opposite sides of the inner housing 510 in the first direction.

The limiting structure 520 is located at one side of the through hole 512 near the flow channel structure 800, the limiting structure 520 is connected with one end of the connecting piece 120 near the flow channel structure 800, and the limiting structure 520 is elastically contacted with the inner shell 510 and can cover the through hole 512. The spacing structure 520 cooperates with the inner housing 510 and separates the first fluid chamber into a first subchamber 710 and a second subchamber 720, the first subchamber 710 and the second subchamber 720 being arranged along a first direction.

In this embodiment, the first subchamber 710 is located above the second subchamber 720. The inner housing 510, the spacing structure 520, and the rubber main spring 200 together define a first subchamber 710, and the inner housing 510, the spacing structure 520, and the flow channel structure 800 together define a second subchamber 720.

The inner case 510 has a second cavity 511 opened downward, and the through hole 512 communicates with the second cavity 511, and the through hole 512 may be a circular hole. An annular protrusion is provided at the lower portion of the inner case 510, and can be abutted against the flow path structure 800. The outer diameter of the limiting structure 520 is greater than the inner diameter of the through hole 512, and thus, the limiting structure 520 cannot pass through the through hole 512.

The lower portion of the installation groove 210 of the rubber main spring 200 is opened so that the connection member 120 passes through the installation groove 210 and is connected with the limit structure 520. The aluminum core 110 is horn-shaped, and the installation groove 210 is also horn-shaped. When the connecting member 120 is connected to the limiting structure 520, the lower surface of the aluminum core 110 contacts the limiting structure 520.

It will be appreciated that the spacing structure 520 will be subjected to some vibration from the powertrain, resulting in a displacement of the spacing structure 520 relative to the inner housing 510 in a first direction, such as the rubber main spring 200, which may act like a pumping piston.

In some examples, the spacing structure 520 remains in contact with the inner housing 510 at all times, and therefore, the first subchamber 710 and the second subchamber 720 are not in communication with each other. When the limit structure 520 moves up and down due to the vibration, the limit structure 520 deforms to a certain extent and is always in contact with the inner housing 510, so as to block the through hole 512.

In other examples, the limit structure 520 is movable back and forth in the first direction and enables the through-hole 512 to be toggled between the open and closed states. Moreover, when the downward movement amount of the limiting structure 520 reaches the maximum, the limiting structure 520 contacts with the runner structure 800, so that the limiting structure 520 can be prevented from further downward movement, and a certain limiting effect is achieved on the power assembly.

In one example, as shown in fig. 1 and 6, the spacing structure 520 includes a resilient portion 521 and a skeleton 522. Wherein the skeleton 522 may be made of a metallic material such as iron. The elastic portion 521 may be made of an elastic material such as a rubber material. The elastic portion 521 encloses the frame 522, and the elastic portion 521 is in elastic contact with the inner case 510.

The skeleton 522 is provided with a through hole 523, the lower part of the connector 120 is provided with a screw part 122, the screw part 122 can pass through the through hole 512 and the through hole 523, and a nut 530 is connected, so that the mounting structure 100 is connected with the limit structure 520. The upper surface of the nut 530 may be in contact with the frame 522 or may be connected to the elastic portion 521.

In one example, as shown in fig. 1, 4 and 5, the case 840 includes a first sub-case 820 and a second sub-case 830. The first sub-shell 820 is located above the second sub-shell 830, a first opening 822 is formed in a middle position of the first sub-shell 820, an opening structure 821 is formed on an upper surface of the first sub-shell 820, a second opening 832 is formed in a middle position of the second sub-shell 830, a groove 831 with an upward opening is formed in the second sub-shell 830, the groove 831 is used for liquid to flow, and the groove 831 is arc-shaped. The recess 831 is provided with an opening.

Thus, the first and second sub-housings 820 and 830 are connected and together define an inertia track 841 and a mounting aperture 842. The decoupling film 810 is positioned between the first aperture 822 and the second aperture 832.

The liquid in the first liquid chamber enters the inertia track 841 through the opening structure 821, and the liquid in the second liquid chamber 730 flows into the inertia track 841 through the opening of the recess 831.

In the present embodiment, as shown in fig. 1 to 6, the aluminum core 110 and the outer case 310 are vulcanization-coupled with the rubber main spring 200 through a vulcanization process. The outer case 310, the inner case 510, the flow path structure 800, the rubber base film 900, and the bottom case 320 are press-fitted by a press-fitting process, causing them to be connected. The first sub-case 820 and the second sub-case 830 are connected through a riveting process, and the decoupling film 810 is press-fitted between the first sub-case 820 and the second sub-case 830.

The rubber main spring 200 is internally hollow and provided with a first concave cavity 220 and a clamping cavity 230, the first concave cavity 220 is positioned above the clamping cavity 230 and is communicated with the clamping cavity 230, and an opening of the clamping cavity 230 is opened downwards. In the press-fitting process, the flow channel structure 800, the annular protrusion of the inner case 510, and the annular flange of the rubber base film 900 are all located in the clamping cavity 230. After the press-fitting work is completed, the rubber main spring 200 and the rubber base film 900 define a closed liquid chamber together.

The housing 310 is provided with a coupling hole so as to be mounted to the vehicle body by a bolt.

Further, as shown in fig. 1 to 7, a control method of a semi-active hydraulic mount according to an embodiment of the second aspect of the present invention is applied to the semi-active hydraulic mount of the embodiment of the first aspect, the control method including the steps of:

Step S1: the input instructions are acquired, and a current driving mode of the vehicle is determined, wherein the driving mode comprises a regular driving mode, a comfortable driving mode and a sport driving mode.

Step S21: and if the vehicle is in the motion driving mode, controlling the electromagnetic structure to obtain electricity.

Step S22: if the vehicle is in the normal driving mode, when the vehicle speed is smaller than a set value, controlling the electromagnetic structure to lose electricity; and when the vehicle is greater than or equal to the set value, controlling the electromagnetic structure to obtain electricity.

Step S23: and if the vehicle is in the comfortable driving mode, controlling the electromagnetic structure to lose electricity.

It will be appreciated that the user may input instructions to the system of the vehicle to select a desired driving mode; after the system acquires the instruction, the data comparison and judgment can be carried out, so that the current driving mode of the vehicle is confirmed. And then, according to the current driving mode of the vehicle, performing power-on and power-off control on the electromagnetic structure of the semi-active hydraulic suspension.

When the current driving mode of the vehicle is selected as the normal driving mode, the vehicle speed needs to be judged, if the vehicle speed is smaller than the set value, the electromagnetic structure is controlled to lose electricity, no magnetic field is generated, then the magneto-deformable element 600 is kept as it is, the hardness of the decoupling film 810 is minimized, and the rigidity and the damping of the semi-active hydraulic suspension are reduced to the minimum, so that the NVH performance requirements under the working conditions of starting, flameout and creeping are met. If the vehicle speed is greater than or equal to the set value, the electromagnetic structure is controlled to be electrified and a magnetic field is generated, so that the magnetically deformable member 600 deforms and stretches, the hardness of the decoupling film 810 is increased, the rigidity and the damping of the semi-active hydraulic suspension are improved, NVH performance requirements under impact working conditions are met, and particularly, better operability can be provided when the vehicle passes through a pit bank or a deceleration strip.

The set value may be set according to the actual situation, for example, the set value may be selected to be 10km/h.

When the current driving mode of the vehicle is selected as the comfortable driving mode, the situation of the vehicle speed is not required to be judged, the electromagnetic structure is directly controlled to lose electricity, the magneto-deformable member 600 is kept to be the same under the action of no magnetic field, and the hardness of the decoupling film 810 is kept to be the minimum, so that the rigidity and the damping of the semi-active hydraulic suspension are reduced, and the vehicle has good NVH performance.

When the current driving mode of the vehicle is selected as the motion driving mode, the situation of judging the size of the vehicle is not needed, the power supply of the electromagnetic structure is directly controlled, the magneto-deformable member 600 deforms and stretches under the action of a magnetic field, the hardness of the decoupling film 810 is increased under the action of the magnetic field, and therefore the rigidity and the damping of the semi-active hydraulic suspension are increased, and the vehicle has good operability.

The semi-active hydraulic suspension provided by the embodiment of the invention is generally applied to front suspension of a longitudinal vehicle and can also be applied to engine end or transmission end suspension of a part of transverse vehicle. When the semi-active hydraulic suspension has high damping and high rigidity, the vehicle has better operability and better performance on the road impact condition of the vehicle. When the semi-active hydraulic mount has low damping and low rigidity, the vehicle has better NVH performance.

In addition, a vehicle according to an embodiment of the third aspect of the invention comprises a semi-active hydraulic suspension of the embodiment of the first aspect.

Specifically, the vehicle may be a private car, such as a sedan, SUV, MPV, or pick-up, or the like. The vehicle may also be an operator vehicle such as a minibus, bus, minivan or large trailer, etc. The vehicle can be an oil vehicle or a new energy vehicle. When the vehicle is a new energy vehicle, the vehicle can be a hybrid vehicle or a pure electric vehicle.

The semi-active hydraulic suspension with the structure can be used for enabling the vehicle to meet performance requirements of different working conditions by adjusting rigidity and damping of the semi-active hydraulic suspension, and better operability is provided for enabling the vehicle to obtain better smoothness.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. Semi-active hydraulic suspension, characterized by comprising:

2. The semi-active hydraulic mount of claim 1, wherein the magnetically deformable member is a magnetostrictive material, the magnetically deformable member is in a ring-like structure, and a central axis of the magnetically deformable member coincides with a central axis of the rubber main spring.

3. The semi-active hydraulic mount of claim 2, wherein the magnetically deformable member is vulcanization bonded to the rubber main spring and the rubber main spring encases the magnetically deformable member.

4. A semi-active hydraulic mount according to claim 3, further comprising a protective case, wherein the rubber main spring comprises a first main spring portion and a second main spring portion connected in a first direction, one end of the first main spring portion away from the second main spring portion is provided with the mounting structure and the magnetically deformable member, the first main spring portion is in a horn shape, the outer diameter of the first main spring portion is reduced from the second main spring portion to the mounting structure, the expansion and contraction direction of the magnetically deformable member is parallel to the side wall extending direction of the first main spring portion, the protective case has a containing groove with an opening facing the first main spring portion, the second main spring portion and the rubber bottom film are both arranged in the containing groove, the second main spring portion is connected with the inner peripheral wall surface of the containing groove, and the first main spring portion is arranged in the containing groove and connected with the inner peripheral wall surface of the containing groove.

5. A semi-active hydraulic mount according to claim 1 wherein the mounting structure is provided with a mounting cavity, the electromagnetic structure is provided within the mounting cavity, and the magnetic field direction of the electromagnetic structure extends in a first direction.

6. The semi-active hydraulic mount of claim 5, wherein the mounting structure comprises an aluminum core and a connecting piece, the aluminum core is connected with the rubber main spring, an axial direction of the connecting piece extends along a first direction, the connecting piece is connected with the aluminum core, one end of the connecting piece, which is far away from the rubber bottom film, is a connecting end for connecting a power assembly, the electromagnetic structure comprises a coil, the coil is wound on a peripheral surface of the connecting piece, and a central axis of the coil, a central axis of the decoupling film and a central axis of the rubber main spring coincide.

7. The semi-active hydraulic mount according to claim 6, wherein the aluminum core is truncated cone-shaped, and the outer diameter of the aluminum core becomes smaller from the rubber main spring toward the rubber base film, and the expansion and contraction direction of the magnetically deformable member is perpendicular to the outer peripheral wall surface of the aluminum core.

8. The semi-active hydraulic mount according to claim 6 or 7, further comprising an inner housing and a limiting structure, wherein the inner housing is disposed in the closed liquid chamber and is located at a side of the flow passage structure near the connecting piece, a through hole is disposed at a middle position of the inner housing, the through hole penetrates through two opposite sides of the inner housing in a first direction respectively, the limiting structure is located at a side of the through hole near the flow passage structure and is connected with one end of the connecting piece near the flow passage structure, the limiting structure is in elastic contact with the inner housing and covers the through hole, and the limiting structure and the inner housing divide the first liquid chamber into a first subchamber and a second subchamber which are arranged along the first direction.

9. The semi-active hydraulic mount of claim 8, wherein the limit structure comprises an elastic portion and a skeleton, the elastic portion wrapping the skeleton, the elastic portion being in elastic contact with the inner shell.

10. A method of controlling a semi-active hydraulic suspension as claimed in any one of claims 1 to 9, comprising the steps of:

11. Vehicle, characterized by comprising a semi-active hydraulic suspension according to any of claims 1 to 9.