Steering wheel hand-leaving induction pad, preparation method thereof and steering wheel

Abstract

The invention provides a steering wheel hand-leaving induction pad and a preparation method thereof and a steering wheel, the hand-leaving induction pad comprises a supporting piece and a conductive fabric, the supporting piece is a sheet-shaped component with ductility, the conductive fabric is formed by weaving a plurality of warp yarns and weft yarns and is laid on the surface of the supporting piece, and the conductive fabric is arranged on the surface of the supporting piece. The radial yarn and / or the weft yarn comprise / comprises elastic yarn, and when the induction pad is configured to at least partially wrap the circumferential surface of the rim, the extending direction of the radial yarn is the same as one of the extending direction or the circumferential direction of the rim. And the weft yarns are the same as the other one of the extending direction or the circumferential direction of the rim. Therefore, the performance of the induction pad can be improved while the stretching requirement of the induction pad is met, and the production cost of the induction pad is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of steering wheel off - hand detection, and particularly to a steering wheel off - hand induction pad, a preparation method thereof, and a steering wheel. Background Art

[0002] Currently, in the application of automotive steering wheels, in order to better assist in vehicle driving and improve the customer experience, an off - hand induction pad is integrated in the steering wheel to identify whether the driver's hand is holding the steering wheel. Generally, as Figure 1A shown, the off - hand induction pad includes a support member 10' and a conductive fabric 20' laid on the surface of the support member 10'. Among them, the conductive fabric 20' serves as the induction layer and the shielding layer of the off - hand induction pad.

[0003] In the specific preparation process, the conductive fabric 20' is usually cut from an overall fabric woven in a plain weave in the warp and weft directions. The existing overall fabric does not have stretchability in the warp and weft directions. Therefore, in order for the conductive fabric 20' to stretch along the rim extension direction and / or the circumferential direction when wrapped around the steering wheel (as Figure 1B shown), when cutting it, it needs to be obliquely cut at an angle of 45 degrees along the warp and weft directions to obtain a strip - shaped conductive fabric 20' (specifically as Figure 1C shown), and then laid flat on a strip - shaped support member; subsequently, when wrapping it around the rim, the length direction of the support member is made to be the same as the rim extension direction, and the width direction is the same as the rim circumferential direction, so as to meet the stretching requirements of the conductive fabric along the rim extension direction and / or the circumferential direction. However, this method not only generates a large amount of waste 30', causing serious waste of materials and greatly increasing the cost; moreover, the conductive fabric 20' after oblique cutting is conducted through the intersection points, and the angle between the conductive yarns will change during the wrapping and stretching process (that is, the intersection points of the conductive yarns will change), thus affecting the conductivity of the conductive fabric and reducing the reliability of the induction pad. Summary of the Invention

[0004] Aiming at the deficiencies of the above - mentioned prior art, the present invention provides a steering wheel off - hand induction pad, a preparation method thereof, and a steering wheel, so as to improve the performance of the induction pad and reduce the production cost of the induction pad while meeting the stretching requirements of the induction pad.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a steering wheel off - hand induction pad, including a support member and a conductive fabric. The support member is a sheet - like component with ductility. The conductive fabric is woven from a plurality of warp yarns and weft yarns and is laid on the surface of the support member. It is characterized in that

[0007] The radial yarn and / or the weft yarn includes an elastic yarn. When the sensing pad is configured to at least partially cover the circumferential surface of the rim, the extending direction of the radial yarn is the same as one of the extending direction or the circumferential direction of the rim, and the extending direction of the weft yarn is the same as the other of the extending direction or the circumferential direction of the rim.

[0008] Preferably, the conductive fabric containing the elastic yarn has stretchability in the radial and / or weft directions, and is configured that when a 200 mm * 25 mm cut piece of the conductive fabric is pulled by a vertical stretcher, the required force value is ≤ 20 N when the stretching rate reaches 15%.

[0009] Preferably, the elastic yarn is a spandex yarn, the conductive fabric is composed of a plain weave base fabric blended with polyester yarn and spandex yarn and a metal coating, and the proportion of the spandex yarn is 0 - 60%.

[0010] Preferably, the conductive fabric is laid on one side surface of the support member to define a detection area on the rim, and the conductive fabric is also laid on the other side surface of the support member to define a shielding area on the rim. The resistance between the two end portions in the extending direction or the circumferential direction of the rim containing the elastic yarn is ≤ 50 Ω.

[0011] In a second aspect, a method for preparing a steering wheel hand - off sensing pad according to the present invention includes:

[0012] Weaving an integral fabric, which is made by a plain weave method of the warp and weft directions blended with polyester yarn and spandex yarn;

[0013] Conductivization treatment, coating a metal coating containing at least nickel on the integral fabric;

[0014] Cutting the conductive fabric. When calibrating the support member, the extending direction and the circumferential direction of the rim when it covers the rim are determined, so that the spandex yarns are aligned in one of the directions, and then cutting according to the overall contour of the support member;

[0015] Laying the conductive fabric, laying the cut conductive fabric flat on the surface of the support member.

[0016] Preferably, the support member is strip - shaped. When covering the surface of the rim, its length direction is consistent with the extending direction of the rim and its width direction is consistent with the circumferential direction of the rim. When cutting the integral fabric, it is cut along the contour of the support member in the warp and weft directions.

[0017] Preferably, the integral fabric is woven in any one of the following three ways:

[0018] Both the warp and weft directions of the integral fabric are alternately woven by the spandex yarn and the polyester yarn in a 1:1 ratio;

[0019] In the warp direction of the overall fabric, the spandex yarn and the polyester yarn are alternately mixed and woven in a 1:1 ratio, and in the weft direction of the overall fabric, the spandex yarn and the polyester yarn are alternately mixed and woven in a 1:2 ratio;

[0020] In the warp direction of the overall fabric, the spandex yarn and the polyester yarn are alternately mixed and woven in a 1:1 ratio, and in the weft direction of the overall fabric, the spandex yarn and the polyester yarn are alternately mixed and woven in a 1:3 ratio.

[0021] Preferably, the metal coating applied on the overall fabric is nickel or copper-nickel, and the content of nickel or copper-nickel is 10%-90%.

[0022] In a third aspect, the present invention provides a steering wheel, and the steering wheel includes the steering wheel hand-off induction pad as described above.

[0023] Preferably, the steering wheel hand-off induction pad includes three pieces of the conductive fabric separated from each other, and the three pieces of the conductive fabric are arranged to be respectively installed on the left side of the front surface of the steering wheel, the right side of the front surface of the steering wheel, and the back surface of the steering wheel.

[0024] By adopting the above technical solutions, the present invention has the following beneficial effects:

[0025] In the present invention, by making the radial yarns and / or weft yarns of the conductive fabric contain elastic yarns, and when the induction pad is configured to at least partially cover the circumferential surface of the rim, the extending direction of the radial yarns is the same as one of the extending direction or the circumferential direction of the rim, and the weft yarns are the same as the other of the extending direction or the circumferential direction of the rim, so as to be able to meet the stretching requirements of the induction pad along the extending direction and / or the circumferential direction of the rim; at the same time, since the warp and weft directions of the conductive fabric both have complete yarns, compared with the prior art in which the obliquely cut conductive fabric is only conducted by relying on the intersection points, the conduction performance is significantly improved, thereby enhancing the reliability of the induction pad.

[0026] In addition, when preparing the induction pad in the present invention, since the overall fabric is made by the warp and weft plain weave method of mixing polyester yarns and spandex yarns, and when cutting, the spandex yarns are aligned along the extending direction or the circumferential direction of the rim for cutting, the main part of the conductive fabric does not need to be obliquely cut, reducing the waste generation of the overall fabric and lowering the production cost of the hand-off induction pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1A It is a schematic plan view of a steering wheel hand-off induction pad in the prior art;

[0028] Figure 1B It is an installation schematic diagram of a steering wheel hand-off induction pad in the prior art;

[0029] Figure 1C It is a schematic diagram of the cutting of the conductive fabric in the prior art;

[0030] Figure 2 It is a schematic diagram of the hierarchical structure of the steering wheel off - hand induction pad in the prior art;

[0031] Figure 3 It is a plan view of the steering wheel off - hand induction pad according to Embodiment 1 of the present invention;

[0032] Figure 4 It is an installation schematic diagram of the steering wheel off - hand induction pad in Embodiment 1 of the present invention;

[0033] Figure 5A It is a schematic diagram of the conductive fabric before stretching in Embodiment 1 of the present invention;

[0034] Figure 5B It is a schematic diagram of the conductive fabric after stretching in Embodiment 1 of the present invention;

[0035] Figure 6 It is a flowchart of the preparation method of the steering wheel off - hand induction pad in Embodiment 2 of the present invention;

[0036] Figure 7A It is a schematic diagram of a knitting method of the overall fabric in Embodiment 2 of the present invention;

[0037] Figure 7B It is a schematic diagram of another knitting method of the overall fabric in Embodiment 3 of the present invention;

[0038] Figure 7C It is a schematic diagram of another knitting method of the overall fabric in Embodiment 4 of the present invention;

[0039] Figure 8 It is a schematic diagram of the cutting of the conductive fabric in Embodiment 2 of the present invention;

[0040] Figure 9 It is a plan view of the off - hand induction pad installed on the steering wheel according to Embodiment 3 of the present invention. Detailed implementation manners

[0041] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0042] The terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. The singular forms "a", "the", and "said" used in the present disclosure and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0043] As Figure 2 shown, the hand-off sensing pad generally includes a sensing layer 1, an insulating layer 3, and a shielding layer 4 that are arranged in layers. Among them, the sensing layer 1 is used to sense the touch state of the human hand on the steering wheel and output corresponding sensing signals, the insulating layer 3 (generally a PE layer) is used to isolate the sensing layer 1 and the shielding layer 4, and the shielding layer 4 is used to isolate external interference signals. Optionally, the hand-off sensing pad may further include a heating layer. In Figure 2 the example shown, the heating layer includes a substrate 5 and heating wires 6 (such as CuNi2) sewn on the substrate 5, and the steering wheel can be heated through the heating wires 6. It should be understood that the different functional layers can be bonded by double-sided tape 2 or other means, and the present invention does not impose any specific limitations on this.

[0044] Generally, both the sensing layer 1 and the shielding layer 4 are made of conductive fabric. The insulating layer 3 is formed as a support. After the conductive fabric is generally cut from an overall fabric woven in a plain weave in the warp and weft directions, it is laid flat on the support. As mentioned above, the existing overall fabric does not have stretchability in the warp and weft directions. Therefore, in order for the conductive fabric to stretch along the rim extension direction and / or the circumferential direction when wrapped around the steering wheel, when cutting it, it needs to be obliquely cut at an angle of 45 degrees along the warp and weft directions to obtain a strip-shaped conductive fabric, and then laid flat on a strip-shaped support. Subsequently, when wrapping it around the rim, making the length direction of the support consistent with the rim extension direction and the width direction consistent with the rim circumferential direction can meet the stretching requirements of the conductive fabric along the rim extension direction and / or the circumferential direction. However, this method not only generates a large amount of waste, causing serious waste of materials and greatly increasing the cost, but also, the conductive fabric after oblique cutting is conducted through the intersection points, and the angle between the conductive yarns will change during the wrapping and stretching process (that is, the intersection points of the conductive yarns will change), thus affecting the conductivity of the conductive fabric and reducing the reliability of the sensing pad.

[0045] In view of this, the present invention provides an improved hand-off sensing pad for a steering wheel, its preparation method, and a steering wheel, which can improve the performance of the sensing pad and reduce the production cost of the sensing pad while meeting the stretching requirements of the sensing pad.

[0046] Embodiment 1

[0047] This embodiment provides a hand-off sensing pad for a steering wheel. As Figures 3 - 4As shown, the hand-off sensing pad includes a support member 10 and a conductive fabric 20. Among them, the support member 10 is a sheet-like member with ductility, and when it is wrapped around the rim 40 of the steering wheel, it will be stretched along the extending direction and / or the circumferential direction of the rim 40. The conductive fabric 20 is woven from a number of warp yarns and weft yarns and is laid on the surface of the support member 10 to form the sensing layer or shielding layer of the hand-off sensing pad.

[0048] In this embodiment, the radial yarns and / or weft yarns of the conductive fabric 20 include elastic yarns, and when the sensing pad is configured to at least partially wrap around the circumferential surface of the rim 40, the extending direction of the radial yarns is the same as one of the extending direction or the circumferential direction of the rim 40, and the weft yarns are the same as the other of the extending direction or the circumferential direction of the rim 40, as specifically shown in Figure 4 As shown. Thus, the stretching requirements of the sensing pad along the extending direction and / or the circumferential direction of the rim 40 can be met. At the same time, since the warp and weft directions of the conductive fabric 20 both have complete yarns, compared with the existing technology where the obliquely cut conductive fabric 20 is only conducted by relying on the intersection points, the conduction performance is significantly improved, thereby enhancing the reliability of the sensing pad.

[0049] Specifically, in order to enable the conductive fabric 20 to have stretching performance in the warp and / or weft directions in this embodiment, elastic yarns are woven in at least one of its warp and weft directions. For example, when the conductive fabric 20 is wrapped around the steering wheel, its warp direction will be stretched, then elastic yarns should be woven in its warp direction; when the conductive fabric 20 is wrapped around the steering wheel, its weft direction will be stretched, then elastic yarns should be woven in its weft direction; when the conductive fabric 20 is wrapped around the steering wheel, both its warp and weft directions will be stretched, then elastic yarns should be woven in both its warp and weft directions.

[0050] In this embodiment, the elastic yarns include but are not limited to spandex (polyester fiber) yarns. Preferably, the conductive fabric 20 is composed of a plain weave base fabric blended with polyester (polyurethane fiber) yarns and spandex yarns, and the proportion of the spandex yarns is 0 - 60%, and the definition of this proportion is: the number of spandex yarns 21 / the total amount of spandex yarns 21 and polyester yarns 22. Preferably, the metal coating includes but is not limited to nickel (i.e., pure nickel) or copper nickel, and the content of the metal coating is 10% - 90%.

[0051] In this embodiment, by weaving elastic yarns in the warp and / or weft directions of the conductive fabric, its warp and / or weft directions have stretching performance. In this embodiment, the evaluation standard for the stretching performance is: for the conductive fabric 20 with a horizontal cutting length of 300 mm (measurement range: 200 mm) and a width of 25 mm, stretch this conductive fabric 20 (200 mm * 25 mm) with a vertical stretcher, and when the stretching rate reaches 15%, the required force value should be ≤ 20 N.

[0052] Preferably, the tensile rate of the warp and / or weft directions of the conductive fabric 20 is 5%-100%. Wherein, the tensile rate is defined as: (the length at the time of being stretched and broken - the original length) / the original length.

[0053] Comparison Figure 5A and Figure 5B It can be seen that when the induction pad is stretched along the weft direction, the elastic yarns in the weft direction will become thinner and longer, generating elasticity. At this time, the distance between the conductive yarns in the weft direction will increase, but the conductive filaments are still intact and do not affect the conductivity.

[0054] In an implementable manner, the conductive fabric 20 is laid on one side surface of the support member 10 for defining a detection area on the rim 40 (i.e., serving as the induction layer 1); the conductive fabric 20 is also laid on the other side surface of the support member 10 for defining a shielding area on the rim 40 (i.e., serving as the shielding layer 4).

[0055] In this embodiment, the resistance between the two end portions of the conductive fabric in the rim extension direction or circumferential direction containing elastic yarns is ≤50Ω. For example, for Figure 3 the shown strip-shaped hand-off induction pad, its length direction corresponds to the extension direction of the rim 40, and its width direction corresponds to the circumferential direction of the rim 40. During the working process, the resistance between the two end portions in the length direction (such as resistance E-E1, resistance F-F1) and the resistance between the two end portions in the width direction (such as resistance G-G1, resistance H-H1) of the conductive fabric 20 are required to be stable and small, which is crucial for the performance of the sensor. However, the resistance A-A1 between the two end portions in the length direction of the traditional obliquely cut conductive fabric (see Figure 1A ) is within the range of 100 ohms. Since it is conducted through the intersection points, the stability is poor. While Figure 3 in the conductive fabric 20, the two end portions in the length direction and the width direction are directly connected by the whole conductive yarn, the resistance is very small and very stable. Even the resistance between the two end portions in the length direction does not exceed 50 ohms, and the resistance between the two end portions in the width direction is smaller. The performance is significantly improved compared with the obliquely cut conductive fabric.

[0056] Embodiment 2

[0057] This embodiment provides a preparation method for a hand-off induction pad of a steering wheel. As Figure 6 shown, the method includes the following steps:

[0058] S1, weaving the overall fabric, which is made by the plain weave method of the warp and weft directions blended with spandex yarn 21 and polyester yarn 22.

[0059] When weaving, the proportion of spandex yarn in the warp and / or weft directions is preferably 0-60%. For example, in Figure 7AIn the shown knitting method, both the warp and weft directions of the fabric are made by mixing spandex yarn 21 and polyester yarn 22, and the ratio of spandex yarn 21 to polyester yarn 22 in both the warp and weft directions is 1:1, and the two are alternately blended. Also, for example, in Figure 7B In the shown knitting method, both the warp and weft directions of the fabric are made by mixing spandex yarn 21 and polyester yarn 22. And in the warp direction, spandex yarn 21 and polyester yarn 22 are alternately blended in a ratio of 1:1, and in the weft direction, spandex yarn 21 and polyester yarn 22 are alternately blended in a ratio of 1:2. Again, for example, in Figure 7C In the shown knitting method, both the warp and weft directions of the fabric are made by mixing spandex yarn 21 and polyester yarn 22. And in the warp direction, spandex yarn 21 and polyester yarn 22 are alternately blended in a ratio of 1:1, and in the weft direction, spandex yarn 21 and polyester yarn 22 are alternately blended in a ratio of 1:3.

[0060] S2, Conductivization treatment, a metal coating containing at least nickel is coated on the whole fabric to make the whole fabric have conductive properties.

[0061] The metal coating applied in this step includes but is not limited to nickel (i.e., pure nickel) or copper-nickel. When nickel is plated, the nickel content is 10%-90%. When copper-nickel is plated, first a layer of nickel is plated, then a layer of copper is plated, and then a layer of nickel is plated, and the total content of copper and nickel is 10%-90%.

[0062] S3, Cut the conductive fabric 20. On the support member 10, mark the rim extension direction and the circumferential direction when it is wrapped around the rim 40, so that the spandex yarns are aligned in one of the directions, and then cut according to the overall contour of the support member.

[0063] For example, assume that the support member 10 is strip-shaped. When it is wrapped around the surface of the rim 40, its length direction is consistent with the rim extension direction, and its width direction is consistent with the rim circumferential direction. When cutting the whole fabric after marking, cut along the contour of the support member in the warp and weft directions, as specifically shown in Figure 7.

[0064] S4, Lay the conductive fabric 20, and lay the cut conductive fabric 20 flat on the surface of the support member 10.

[0065] In an implementable manner, conductive fabrics 20 are respectively laid on both side surfaces of the support member 10 to be used as the induction layer and the shielding layer of the induction pad respectively.

[0066] When preparing the induction pad by using the method of this embodiment, since the whole fabric is made by the plain weave knitting method of the warp and weft directions mixed with polyester yarn and spandex yarn, and when cutting, the spandex yarns are aligned in the rim extension direction or the circumferential direction for cutting, the main part of the conductive fabric does not need to be obliquely cut. Comparing Figure 7 and Figure 1C It can be seen that the waste generated by cutting in this embodiment is significantly reduced, greatly reducing the production cost of the proximity induction pad.

[0067] When the induction pad is installed on the rim 40 of the steering wheel after being laid, the support member can be fixedly wrapped around the rim 40 along its calibrated rim extension direction and circumferential direction. Since the spandex yarn is elastic, it can meet the stretching requirements of the conductive fabric 20 during wrapping.

[0068] Embodiment 3

[0069] This embodiment provides a steering wheel, as Figure 4 shown, including a rim 40, a spoke 50, and a hand-off induction pad as provided in Embodiment 1. Among them, the hand-off induction pad at least partially wraps the rim 40, and the outermost layer of the rim 40 is wrapped with leather (not shown), and the leather covers the rim 40 and the hand-off induction pad.

[0070] Since this embodiment adopts the hand-off induction pad provided in Embodiment 1, it has low cost and good conductive performance, thus ensuring the reliability and stability of the hand-off induction function of the steering wheel.

[0071] Preferably, as Figure 9 shown, the hand-off induction pad adopted in this embodiment includes three pieces of conductive fabrics 20A, 20B, and 20C that are separated from each other and located on the front of the support member 10 to serve as induction layers respectively. Among them, the conductive fabrics 20A and 20B have the same width and are arranged flush with each other along the length direction on the support member 10, and the conductive fabric 20C is parallel to the conductive fabrics 20A and 20B. When installing the induction pad on the steering wheel, the conductive fabric 20A (or 20B) is installed on the left side of the front of the steering wheel to sense the driver's contact with the left side of the front of the steering wheel, the conductive fabric 20B (or 20A) is installed on the right side of the front of the steering wheel to sense the driver's contact with the right side of the front of the steering wheel, and the conductive fabric 20C is installed on the back of the steering wheel to sense the driver's contact with the back of the steering wheel. Thus, the hand-off induction pad can realize the detection of the human hand at different positions of the steering wheel.

[0072] Refer to again Figure 9 shown, a conductive fabric 20D is provided on the back of the support member 10, and the conductive fabric 20D covers the ranges of the conductive fabrics 20A, 20B, and 20C to serve as a shielding layer corresponding to the three induction layers together.

[0073] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A steering wheel hand-off sensor pad, comprising a support and a conductive fabric, wherein the support is a sheet-like component with ductility, and the conductive fabric is woven from a plurality of warp yarns and weft yarns and laid on the surface of the support, characterized in that: The radial yarn and / or the weft yarn include elastic yarn, and when the sensing pad is configured to at least partially cover the circumferential surface of the rim, the extension direction of the radial yarn is the same as one of the extension direction or the circumferential direction of the rim, and the weft yarn is the same as the other of the extension direction or the circumferential direction of the rim.

2. The steering wheel hand-off sensor pad according to claim 1, characterized in that: The conductive fabric containing the elastic yarn has radial and / or weft stretchability and is configured such that when a 200mm*25mm conductive fabric piece is pulled by a vertical stretching instrument, the required force is ≤20N when the stretching rate reaches 15%.

3. The steering wheel hand-off sensor pad according to claim 2, characterized in that: The elastic yarn is spandex yarn, and the conductive fabric is composed of a plain weave base blended with polyester yarn and spandex yarn and a metal plating layer, wherein the spandex yarn accounts for 0-60%.

4. The steering wheel hands-off sensing pad according to any one of claims 1 to 3, characterized in that: The conductive fabric is laid on one side surface of the support member to define a detection area on the rim, and the conductive fabric is also laid on the other side surface of the support member to define a shielding area on the rim. The resistance between the two ends of the rim including the elastic yarn in the extension direction or the circumferential direction is ≤50Ω.

5. A method for preparing a steering wheel hands-off sensing pad, characterized in that: include: Woven overall fabric, made of polyester yarn and spandex yarn blended in plain weave in warp and weft; Conductive treatment, wherein a metal plating layer containing at least nickel is applied to the entire fabric; Cut the conductive fabric, mark the extension direction and circumferential direction of the rim when it is wrapped on the rim on the support, align the spandex yarn along one of the directions, and then cut it according to the overall contour of the support; Laying the conductive fabric, laying the cut conductive fabric flatly on the surface of the support.

6. The preparation method according to claim 5, characterized in that: The support member is in the shape of an elongated strip. When it is wrapped around the surface of the wheel rim, its length direction is consistent with the extension direction of the wheel rim and its width direction is consistent with the circumferential direction of the wheel rim. When the whole fabric is cut, it is cut along the outline of the support member in the longitude and latitude directions.

7. The preparation method according to claim 5, characterized in that: The overall fabric is woven in any of the following three ways: The warp and weft directions of the overall fabric are both formed by alternately knitting the spandex yarn and the polyester yarn in a ratio of 1:1; The overall fabric is formed by alternately knitting the spandex yarn and the polyester yarn in a ratio of 1:1 in the warp direction, and alternately knitting the spandex yarn and the polyester yarn in a ratio of 1:2 in the weft direction; The overall fabric is formed by alternately knitting the spandex yarn and the polyester yarn in a ratio of 1:1 in the warp direction, and by alternately knitting the spandex yarn and the polyester yarn in a ratio of 1:3 in the weft direction.

8. The preparation method according to any one of claims 5 to 7, characterized in that: The metal plating layer coated on the overall cloth is nickel or copper-nickel, and the content of nickel or copper-nickel is 10%-90%.

9. A steering wheel, characterized in that: The steering wheel comprises a steering wheel hand-off sensing pad as claimed in any one of claims 1 to 4.

10. The steering wheel according to claim 9, characterized in that The steering wheel hand-off sensing pad comprises three pieces of conductive fabric separated from each other, and the three pieces of conductive fabric are arranged to be installed on the left side of the front of the steering wheel, the right side of the front of the steering wheel and the back of the steering wheel respectively.

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