阅读说明：本技术 一种汽车安全带预紧端片及汽车 (Car blet pretension end piece and car ) 是由 宁蓉 唐正强 张海平 王存峰 于 2020-12-23 设计创作，主要内容包括：发明提供一种汽车安全带预紧端片及汽车,该预紧端片包括钢丝绳、弹片卡座、活塞连杆以及钢管；弹片卡座套设于活塞连杆上；弹片卡座的周向上设有卡爪,卡爪能够沿弹片卡座的径向发生弹性形变；活塞连杆套设于钢丝绳上,并能够带动钢丝绳在钢管的腔体内移动,从而实现预紧动作；钢管的内壁上设有卡槽；弹片卡座能够随活塞连杆一起移动,并使卡爪卡接在卡槽内,从而限制活塞连杆在单一方向的移动；本发明提供的方案,加工方便、装配简单、实用性强、可靠性高,具有很强的抗轴向力能力,同时提高预紧端片的锁止性能,进而提高汽车安全驾驶性能。(The invention provides an automobile safety belt pre-tightening end piece and an automobile, wherein the pre-tightening end piece comprises a steel wire rope, an elastic piece clamping seat, a piston connecting rod and a steel pipe; the elastic sheet clamping seat is sleeved on the piston connecting rod; the clamping jaws are arranged on the circumference of the elastic sheet clamping seat and can elastically deform along the radial direction of the elastic sheet clamping seat; the piston connecting rod is sleeved on the steel wire rope and can drive the steel wire rope to move in the cavity of the steel pipe, so that pre-tightening action is realized; the inner wall of the steel pipe is provided with a clamping groove; the elastic sheet clamping seat can move along with the piston connecting rod, and the clamping jaws are clamped in the clamping grooves, so that the movement of the piston connecting rod in a single direction is limited; the scheme provided by the invention has the advantages of convenience in processing, simplicity in assembly, strong practicability, high reliability and strong axial force resistance, and meanwhile, the locking performance of the pre-tightening end piece is improved, so that the safe driving performance of an automobile is improved.)

1. The automobile safety belt pre-tightening end piece is characterized by comprising a steel wire rope (3), an elastic piece clamping seat (7), a piston connecting rod (8) and a steel pipe (11); the elastic sheet clamping seat (7) is sleeved on the piston connecting rod (8); the clamping jaw (14) is arranged on the periphery of the elastic sheet clamping seat (7), and the clamping jaw (14) can elastically deform along the radial direction of the elastic sheet clamping seat (7); the piston connecting rod (8) is sleeved on the steel wire rope (3) and can drive the steel wire rope (3) to move in the cavity of the steel pipe (11), so that pre-tightening action is realized; a clamping groove (12) is formed in the inner wall of the steel pipe (11); the elastic sheet clamping seat (7) can move along with the piston connecting rod (8) and enables the clamping jaws (14) to be clamped in the clamping grooves (12), so that the piston connecting rod (8) is limited to move in a single direction.

2. The automotive seatbelt pretensioner end plate according to claim 1, wherein the pretensioner end plate further comprises a wire rope holder (10); the piston connecting rod (8) comprises a central column (15), the central column (15) is of a hollow structure, and a clamp holder connecting part (17) is arranged at one end of the central column (15); the clamp connecting part (17) is riveted with one end of the steel wire rope clamp (10) so as to be connected into a whole; the steel wire rope clamp holder (10) is sleeved on the steel wire rope (3) and can move in a cavity of the steel pipe (11) under the pushing of the piston connecting rod (8); the steel wire rope clamp (10) is used for clamping the steel wire rope (3).

3. The automobile safety belt pre-tightening end piece according to claim 2, wherein a spring piece clamping seat installation groove (18) is further formed in the central column (15), the spring piece clamping seat (7) further comprises a spring piece body, and the clamping jaws (14) are arranged on the circumferential direction of the spring piece body; the elastic sheet body is sleeved on the central column (15) and is positioned in the elastic sheet clamping seat mounting groove (18); a gap is reserved between the clamping jaw (14) and the central column (15), so that the clamping jaw (14) is elastically deformed along the radial direction of the central column (15) and can be clamped in the clamping groove (12).

4. The automotive seatbelt pretensioner end plate according to claim 2, wherein the pretensioner end plate further comprises a piston seal (9); one end of the central column (15) is provided with a sealing ring mounting groove (16); the piston sealing ring (9) is sleeved in the sealing ring mounting groove (16) and can move along with the piston connecting rod (8) in the cavity of the steel pipe (11), so that a sealing cavity is formed.

5. The automotive seatbelt pretensioner end plate according to claim 4, wherein the pretensioner end plate further includes a joint body (5) and a gas generator (6); the joint body (5) comprises a first interface and a second interface, and the first interface is communicated with the gas generator (6); the second interface is communicated with a sealed cavity of the steel pipe (11); the gas generator (6) receives an electric signal to convey gas into the sealed cavity, and then the piston connecting rod (8) and the steel wire rope clamp holder (10) are pushed to slide in the cavity of the steel pipe (11).

6. The automobile safety belt pre-tightening end piece according to claim 2, characterized in that a stopping point (13) is further arranged on the inner wall of the steel pipe (11), and the distance between the stopping point (13) and the clamping groove (12) is less than 10 mm; the stop point (13) is used for limiting the moving distance of the piston connecting rod (8) and the steel wire rope clamp holder (10) in the steel pipe (11); when the piston connecting rod (8) moves leftwards to a first position, the clamping jaws (14) are clamped in the clamping grooves (12), so that the piston connecting rod (8) cannot continuously slide leftwards; when the steel wire rope holder (10) moves rightwards to the second position, the convex ring on the steel wire rope holder (10) is limited by the stop point (13) and cannot slide rightwards continuously.

7. The automotive seatbelt pretensioner end plate according to claim 2, wherein the pawl (14) is made of a spring steel material; when the piston connecting rod (8) moves in the cavity of the steel pipe (11), the inner wall of the steel pipe (11) applies a radial pressure to the clamping jaws (14), so that the clamping jaws (14) compress the central column (15), and the piston connecting rod (8) moves forwards on the inner wall of the steel pipe (11).

8. The automotive seatbelt pretensioner end tab according to claim 7, wherein a gap reserved between the pawl (14) and the center pillar (15) is 0.5mm or more; and/or the clamping jaws (14) comprise three clamping jaws (14), and the three clamping jaws (14) are uniformly distributed on the circumference of the elastic sheet body.

9. The automobile safety belt pre-tightening end piece according to claim 1, characterized in that the clamping groove (12) is arranged along the inner wall of the steel pipe (11) in a circle; one side of the clamping groove (12) is provided with an inclined opening along the axial direction of the steel pipe (11), so that the clamping jaw (14) can be clamped in the clamping groove (12) along a single direction.

10. A motor vehicle comprising a seat belt pretensioner tab, wherein the seat belt pretensioner tab is a motor vehicle seat belt pretensioner tab according to any of claims 1 to 9.

Technical Field

The invention belongs to the technical field of automobile safety belt pre-tightening end pieces, and particularly relates to an automobile safety belt pre-tightening end piece and an automobile.

Background

The pre-tightening end piece is a product for realizing the recovery of the belt of the safety belt when the automobile is collided, and can reduce the pressure born by passengers in collision accidents; with the continuous development of automobile safety technology in China, the application of the pre-tightening end plate is more and more extensive, and the pre-tightening end plate can be used for replacing a common lower end plate of a safety belt.

The working principle of the pre-tightening end piece comprises the following steps: after the pre-tightening is finished, the pre-tightening end piece is pulled reversely by the braid, and the steel ball continues to move forwards due to certain inertia, so that the steel ball is forced to expand outwards by the conical surface of the piston, and finally the steel ball is clamped on the wall of the steel pipe to generate locking; the system performance requires that the locking stroke is less than 10 mm; the existing pre-tightening end piece forces the steel ball to clamp the steel pipe wall to be locked through the acting force of the conical surface of the piston, but the existing pre-tightening end piece has the problems of instability and large fluctuation of a locking stroke.

Based on the technical problems existing in the pre-tightening end piece, no relevant solution is provided; there is therefore a pressing need to find effective solutions to the above problems.

Disclosure of Invention

The invention aims to provide an automobile safety belt pre-tightening end piece and an automobile aiming at overcoming the defects in the prior art and solving the problem that the locking function of the existing pre-tightening end piece is unstable.

The invention provides a pre-tightening end piece of an automobile safety belt, which comprises a steel wire rope, an elastic piece clamping seat, a piston connecting rod and a steel pipe, wherein the steel wire rope is arranged on the steel wire rope; the elastic sheet clamping seat is sleeved on the piston connecting rod; the clamping jaws are arranged on the circumference of the elastic sheet clamping seat and can elastically deform along the radial direction of the elastic sheet clamping seat; the piston connecting rod is sleeved on the steel wire rope and can drive the steel wire rope to move in the cavity of the steel pipe, so that pre-tightening action is realized; the inner wall of the steel pipe is provided with a clamping groove; the elastic sheet clamping seat can move along with the piston connecting rod, and the clamping jaws are clamped in the clamping grooves, so that the piston connecting rod is limited to move in a single direction.

Furthermore, the pre-tightening end piece also comprises a steel wire rope clamp holder; the piston connecting rod comprises a central column, the central column is of a hollow structure, and one end of the central column is provided with a clamp holder connecting part; the clamp holder connecting part is riveted with one end of the steel wire rope clamp holder so as to be connected into a whole; the steel wire rope clamp holder is sleeved on the steel wire rope and can move in the cavity of the steel pipe along with the piston connecting rod; the wire rope holder is used for clamping the wire rope.

Furthermore, the central column is also provided with an elastic sheet clamping seat installation groove, the elastic sheet clamping seat also comprises an elastic sheet body, and the clamping jaws are arranged on the circumference of the elastic sheet body; the elastic sheet body is sleeved on the central column and is positioned in the elastic sheet clamping seat mounting groove; a gap is reserved between the clamping jaw and the central column, so that the clamping jaw is elastically deformed along the radial direction of the central column and can be clamped in the clamping groove.

Furthermore, the pre-tightening end piece also comprises a piston sealing ring; one end of the central column is provided with a sealing ring mounting groove; the piston sealing ring is sleeved in the sealing ring mounting groove and can move in the cavity of the steel pipe under the pushing of the piston connecting rod, so that a sealing cavity is formed.

Furthermore, the pre-tightening end piece also comprises a joint body and a gas generator; the joint body comprises a first interface and a second interface, and the first interface is communicated with the gas generator; the second interface is communicated with the sealed cavity of the steel pipe; the gas generator receives an electric signal to convey gas into the sealed cavity, and then pushes the piston connecting rod and the steel wire rope holder to slide in the cavity of the steel pipe.

Furthermore, a blocking point is also arranged on the inner wall of the steel pipe, and the distance between the blocking point and the clamping groove is less than 10 mm; the stopping point is used for limiting the moving distance of the piston connecting rod and the steel wire rope clamp holder in the steel pipe; when the piston connecting rod moves leftwards to the first position, the clamping jaws are clamped in the clamping grooves, so that the piston connecting rod cannot continuously slide leftwards; when the steel wire rope holder moves rightwards to the second position, the convex ring on the steel wire rope holder is limited by the blocking point and cannot slide rightwards continuously.

Furthermore, the clamping jaws are made of spring steel materials; when the piston connecting rod moves in the cavity of the steel pipe, the inner wall of the steel pipe applies radial pressure to the clamping jaw, so that the clamping jaw compresses towards the central column, and the piston connecting rod moves forwards on the inner wall of the steel pipe.

Furthermore, a reserved gap between the clamping jaw and the central column is more than 0.5 mm; and/or the jack catch includes three, three jack catch evenly distributed in the circumferencial direction of shell fragment body.

Furthermore, the clamping grooves are arranged along the inner wall of the steel pipe in a circle; one side of the clamping groove is provided with an inclined opening along the axial direction of the steel pipe, so that the clamping jaw can be clamped in the clamping groove along a single direction.

Correspondingly, the invention also provides an automobile, which comprises the safety belt pre-tightening end piece.

The invention provides an automobile safety belt pre-tightening end piece which is convenient to process, simple to assemble, strong in practicability and high in reliability, has strong axial force resistance, and meanwhile improves the locking performance of the pre-tightening end piece, so that the safe driving performance of an automobile is improved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The invention will be further explained with reference to the drawings, in which:

FIG. 1 is an exploded view of a pretensioned end plate of an automobile seat belt in accordance with the present invention;

FIG. 2 is a front view of the spring plate holder of the present invention;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a right side view of the spring plate cartridge of the present invention;

FIG. 5 is a left side view of the spring plate holder of the present invention;

FIG. 6 is a schematic view of the locking assembly of the present invention (not including steel tube);

FIG. 7 is a partial cross-sectional view of a steel pipe of the present invention;

FIG. 8 is a schematic view of the locking assembly of the present invention;

FIG. 9 is a cross-sectional view taken along line B-B of FIG. 8;

FIG. 10 is a schematic view of a piston rod structure according to the present invention.

In the figure: 1-end piece; 2-heat shrink tube; 3-a steel wire rope; 4-a support plate; 5-body; 6-a gas generator; 7-a spring plate clamping seat; 8-piston rod; 9-piston seal ring; 10-a wire rope holder; 11-a steel pipe; 12-a card slot; 13-gear point; 14-a jaw; 15-a central column; 16-a seal ring mounting groove; 17-a gripper connection; 18-spring plate clamping seat mounting groove.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1 to 10, the invention provides a pre-tightening end piece of an automobile safety belt, which is used for the automobile safety belt and can timely retract a waist belt when an automobile is collided, so that the pressure born by passengers in a collision accident is reduced; the pre-tightening end piece comprises a steel wire rope 3, an elastic piece clamping seat 7, a piston connecting rod 8 and a steel pipe 11; wherein, the spring plate clamping seat 7 is sleeved on the piston connecting rod 8 and can move together with the piston connecting rod 8; the clamping jaw 14 is arranged on the circumference of the elastic sheet clamping seat 7, and the clamping jaw 14 can elastically deform along the radial direction of the elastic sheet clamping seat 7; the piston connecting rod 8 is sleeved on the steel wire rope 3 and can drive the steel wire rope 3 to move in the cavity of the steel pipe 11, so that pre-tightening action is realized, namely the waistband is driven to be recovered in emergency; a clamping groove 12 is arranged on the inner wall of the steel pipe 11; the elastic sheet clamping seat 7 can move together with the piston connecting rod 8, and the clamping jaws 14 are clamped in the clamping grooves 12, so that the piston connecting rod 8 is limited to move in a single direction, namely the clamping jaws 14 can be clamped in the clamping grooves 12 in one direction only, and locking is realized in the reverse direction; in the practical application process, the clamping jaw is extruded and deformed by the inner wall of the steel pipe 11 in the ignition process, the clamping jaw with the barb structure can move forwards along the inner wall of the steel pipe in a smooth manner, and the clamping jaw rebounds instantly after passing through the clamping groove of the steel pipe and is clamped in the clamping groove to realize locking; the automobile safety belt pre-tightening end piece provided by the invention has stable axial force resistance, effectively improves the locking reliability, and optimizes the locking performance of the pre-tightening end piece.

Preferably, in combination with the above solutions, as shown in fig. 1 to 10, the present invention provides an automobile seat belt pretensioner end plate further including a wire rope holder 10; the piston rod 8 comprises a central column 15; the central column 15 is a hollow structure; one end of the central column 15 is provided with a clamp connecting part 17; the clamp holder connecting part 17 is riveted and connected with one end of the steel wire rope clamp holder 10 into a whole, so that a piston locking assembly is formed, and the piston locking assembly drives the steel wire rope to perform recovery motion by clamping the steel wire rope; the steel wire rope clamp 10 is sleeved on the steel wire rope 3 and can move together in the cavity of the steel pipe 11 under the pushing of the piston connecting rod 8; the steel wire rope clamp 10 is used for clamping the steel wire rope 3; furthermore, according to the automobile safety belt pre-tightening end piece provided by the invention, the clamping jaw is of a barb locking structure, and is locked through the barb clamping jaw and the steel pipe inner wall clamping groove structure, so that the clamping firmness is good, the locking can be performed in advance, and the problem of overlarge dynamic locking distance in collision is prevented.

Preferably, in combination with the above solutions, as shown in fig. 1 to 10, the invention provides an automobile safety belt pretensioning end plate further comprising an end plate 1 and a heat shrinkable tube 2, wherein one end of a steel wire rope 3 is connected with the end plate 1 through the heat shrinkable tube 2; the central column 15 is also provided with an elastic sheet clamping seat installation groove 18, and the elastic sheet clamping seat 7 also comprises an elastic sheet body which is of a conical structure; the claws 14 are arranged on the circumference of the elastic sheet body; the elastic sheet body is sleeved on the central column 15 and is positioned in the elastic sheet clamping seat mounting groove 18; a gap is reserved between the clamping jaw 14 and the central column 15, so that the clamping jaw 14 is elastically deformed along the radial direction of the central column 15 and can be clamped in the clamping groove 12 to realize locking.

Preferably, in combination with the above solution, as shown in fig. 1 to 10, the present invention provides an automobile seat belt pretensioning end piece further comprising a piston seal ring 9; one end of the central column 15 is provided with a sealing ring mounting groove 16; the piston sealing ring 9 is sleeved in the sealing ring mounting groove 16 and can move in the cavity of the steel pipe 11 along with the piston connecting rod 8, so that a sealed cavity is formed; specifically, the piston seal ring 9 slides in the cavity of the steel pipe 11, so that a sealing effect is achieved, the steel pipe 11 can form a sealed cavity, and when the sealed cavity is inflated, the piston locking assembly can be driven to move, and pre-tightening is achieved.

Preferably, in combination with the above solution, as shown in fig. 1 to 10, the invention provides an automobile seat belt pretensioning end piece further comprising a joint body 5 and a gas generator 6; the joint body 5 comprises a first interface and a second interface, and the first interface is communicated with the gas generator 6; the second interface is communicated with the sealed cavity of the steel pipe 11; the gas generator 6 receives an electric signal to ignite gunpowder so as to deliver gas into the sealed cavity, and further pushes the piston connecting rod 8 and the steel wire rope holder 10 to slide in the cavity of the steel pipe 11; specifically, a sensor outside the safety belt gives an electric signal to an ignition device of the pre-tightening end piece 1, then a generator 6 starts a chemical reaction to generate gas to enter a sealed cavity, and further pushes an elastic sheet clamping seat 7, a piston connecting rod 8 and a steel wire rope clamping device 10 to drive a steel wire rope 3 to move forwards, and pre-tightening action starts; piston seal ring 9 is used for the gas in the sealed steel pipe 11, guarantees certain gas pressure, receives steel pipe inner wall extrusion deformation at the in-process shell fragment of lighting a fire, and the jack catch can be followed steel pipe inner wall and moved forward in the same direction as the slip, through the steel pipe draw-in groove in the twinkling of an eye, and the shell fragment cassette is kick-backed, and the jack catch card advances the draw-in groove, realizes the locking, and shell fragment cassette anti axial force ability is stable, has effectively improved the locking reliability.

Preferably, with reference to the above schemes, as shown in fig. 1 to 10, a stopping point 13 is further provided on the inner wall of the steel tube 11, a distance between the stopping point 13 and the clamping groove 12 is set to be less than 10mm according to design requirements, the stopping point 13 is used for limiting a moving distance of the piston connecting rod 8 and the steel wire rope holder 10 in the steel tube 11, and a relative position of the clamping groove 12 and the stopping point 13 on the inner wall of the steel tube 11 needs to ensure that the clamping jaw can enter the clamping groove 12 at the moment of pulling back; specifically, when the piston connecting rod 8 moves leftwards to the first position, the claw 14 can be clamped in the clamping groove 12, so that the piston connecting rod 8 cannot continuously slide leftwards; when the wire rope holder 10 moves rightwards to the second position, the convex ring on the wire rope holder 10 cannot slide rightwards continuously due to the limit of the stop point 13.

Preferably, in combination with the above solutions, as shown in fig. 1 to 10, the jaw 14 is made of a spring steel material, that is, the jaw 14 is made of a 65Mn material, and the spring steel material has good compression and rebound resilience, and can achieve compression and rebound locking; when the piston connecting rod 8 moves in the cavity of the steel tube 11, a radial pressure is applied to the claws 14 by the inner wall of the steel tube 11, so that the claws 14 are compressed towards the central column 15, and the piston connecting rod 8 moves forwards on the inner wall of the steel tube 11.

Preferably, in combination with the above scheme, as shown in fig. 1 to 10, in the automobile safety belt pretension end plate provided by the invention, the elastic sheet clamping seat 7 is provided with three clamping jaws 14 with barb structures, and the three clamping jaws 14 are uniformly distributed on the circumference of the elastic sheet body; the elastic sheet body structurally connected with the clamping jaw 14 is of an elastic sheet structure, the thickness of the elastic sheet body is 1-2 mm, and sufficient radial compression gaps are reserved through design, so that the clamping and recovering functions are realized; the elastic sheet body can be made of spring steel material (such as 65 Mn) with good rebound resilience; the spring plate body is connected to the piston connecting rod 8, when the piston connecting rod 8 is pushed by gas to move, the inner wall of the steel pipe 11 applies certain pressure to the clamping jaws 14, the clamping jaws 14 compress downwards, and the clamping jaws can move forwards on the inner wall of the steel pipe in a smooth mode; the clearance reserved between the clamping jaw 14 and the central column 15 is more than 0.5mm, and the space for axial compression and rebound of the elastic sheet is ensured.

Preferably, in combination with the above solution, as shown in fig. 1 to 10, the clamping groove 12 is arranged along the inner wall of the steel pipe 11 in a circle; the relative position of the clamping groove 12 and the stop point 13 on the inner wall of the steel pipe 11 needs to ensure that the clamping jaw 14 can enter the clamping groove 12 at the moment of pulling back; one side of the clamping groove 12 is provided with an inclined opening along the axial direction of the steel pipe 11, so that the clamping jaw 14 can be clamped in the clamping groove 12 along a single direction; when the steel wire rope clamp 10 moves to the front of the stop point 13 of the steel pipe wall, the forward movement is stopped, after the pre-tightening is completed, the braid pulls the steel wire rope of the pre-tightening end piece to move reversely, the jack catch 14 rebounds through the jack catch 12 instantly, the jack catch of the jack catch clamp 7 is clamped into the jack catch 12 on the inner wall of the steel pipe 11, and the locking of the pre-tightening end piece is completed.

Correspondingly, in combination with the above solutions, as shown in fig. 1 to 10, the present invention further provides an automobile, including a seat belt pre-tightening end piece, where the seat belt pre-tightening end piece is the above automobile seat belt pre-tightening end piece; by adopting the automobile safety belt pre-tightening end piece, the safety of automobile driving can be effectively improved, and the pressure born by passengers in collision accidents can be reduced.

The invention provides an automobile safety belt pre-tightening end piece which is convenient to process, simple to assemble, strong in practicability and high in reliability, has strong axial force resistance, and meanwhile improves the locking performance of the pre-tightening end piece, so that the safe driving performance of an automobile is improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Those skilled in the art can make numerous possible variations and modifications to the described embodiments, or modify equivalent embodiments, without departing from the scope of the invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technology of the present invention are within the protection scope of the present invention, unless the content of the technical solution of the present invention is departed from.