Hand-away sensing structure and steering wheel cover

Abstract

The utility model relates to the field of intelligent automobile driving, in particular to a hand-leaving sensing structure and a steering wheel cover. An induction electrode of the hand-leaving induction structure generates a hand-leaving signal in response to disturbance of an object in contact with the induction electrode to the induction electrode when the object is away from the induction electrode; the excitation electrode can be coupled with the induction electrode when an object is in contact with the induction electrode, and forms disturbance on the induction electrode when the object in contact with the induction electrode is away from the induction electrode; the first induction section of the induction electrode is at least partially surrounded by the excitation electrode; the first induction section is arranged adjacent to the excitation electrode, and the second induction section is arranged adjacent to the excitation electrode, so that the capacitance formed between the first induction section and the excitation electrode is smaller than the capacitance formed between the second induction section and the excitation electrode, and therefore, when a hand is in contact with the induction motor, the relative influence of the capacitance between the hand and the induction electrode is small and can be ignored; therefore, the interference of adjacent partitions is reduced, and the accuracy of mutual inductance detection between the induction electrode and the excitation electrode is improved.

Description

Technical Field

[0001] This application relates to the field of intelligent vehicle driving, and specifically to a hands-free sensing structure and a steering wheel cover. Background Technology

[0002] As autonomous driving technology evolves to Level 2+ and above, the importance of Driver Status Monitoring Systems (DMS) is becoming increasingly prominent. Among them, Hands Off Detection (HOD), as one of the core functions of DMS, aims to determine in real time whether the driver's hands are in effective contact with the steering wheel, so as to ensure that the driver can respond in a timely manner when the system requests takeover.

[0003] Existing hands-off detection technologies include indirect detection based on torque sensors and direct detection based on capacitance / pressure sensors. However, traditional hands-off detection technologies are limited by sensing principles and environmental adaptability, generally suffering from insufficient detection accuracy. Even some hands-off detection technologies with zone detection capabilities have issues with zone misjudgment and inaccurate detection. The accuracy of hands-off detection has become a bottleneck restricting the safety and user experience of advanced autonomous driving. Utility Model Content

[0004] To solve, or at least partially solve, the above-mentioned technical problems, this application provides an off-hand sensing structure, comprising:

[0005] A sensing electrode that generates a release signal in response to a disturbance of the sensing electrode by an object in contact with it as the object moves away from the sensing electrode;

[0006] The excitation electrode is capable of coupling with the sensing electrode when an object contacts the sensing electrode, and of perturbing the sensing electrode when the object in contact with the sensing electrode moves away from the sensing electrode.

[0007] The sensing electrode includes:

[0008] The first sensing segment is at least partially surrounded by the excitation electrode;

[0009] The second sensing segment is disposed adjacent to the excitation electrode, and the capacitance formed between the first sensing segment and the excitation electrode is smaller than the capacitance formed between the second sensing segment and the excitation electrode.

[0010] Optionally, the second sensing segment is stacked with the excitation electrode.

[0011] Optionally, the second sensing segment extends to the terminal, on which an excitation electrode is also connected.

[0012] Optionally, the off-hand sensing structure further includes an insulating layer, the insulating layer comprising:

[0013] The first sensing segment and the excitation electrode are respectively disposed on the substrate;

[0014] An edge-sealing layer is disposed at the edge of the base layer and is stacked with the base layer, and the second sensing segment is disposed in the edge-sealing layer.

[0015] Optionally, the second sensing segment extends from the first sensing segment to the outside of the region surrounded by the excitation electrode and extends along the edge of the insulating layer.

[0016] Optionally, multiple sensing electrodes are provided, each sensing electrode extending within a preset region, and the excitation electrode extending along the edge of the preset region and at least partially surrounding each sensing electrode.

[0017] Optionally, at least a portion of the excitation electrode extends between two adjacent sensing electrodes.

[0018] Optionally, each of the sensing electrodes includes a conductive wire arranged from a first side to a second side within the preset area, and then folded back to the first side, and so on.

[0019] This application provides a steering wheel cover, including:

[0020] A sleeve body having an opening and being detachably mounted on the surface of the steering wheel;

[0021] The off-hand sensing structure described above is disposed on the sleeve body; the second sensing segment of the off-hand sensing structure is disposed adjacent to the excitation electrode at the opening edge of the sleeve body.

[0022] Optionally, the opening edge of the sleeve body has a edging, and the second sensing segment is disposed within the edging and stacked with the excitation electrode.

[0023] The off-hand sensing structure provided in this application generates an off-hand signal in response to the disturbance caused by an object moving away from the sensing electrode. An excitation electrode couples with the sensing electrode when the object is in contact with it and disturbs the sensing electrode when the object moves away. Thus, the sensing electrode and excitation electrode achieve off-hand detection based on the mutual inductance principle of hand interference. Specifically, the first sensing segment of the sensing electrode is at least partially surrounded by the excitation electrode; the second sensing segment is disposed adjacent to the excitation electrode, such that the distance between the first sensing segment and the excitation electrode is greater than the distance between the second sensing segment and the excitation electrode. This results in a capacitance much smaller between the first sensing segment and the excitation electrode than between the second sensing segment and the excitation electrode. Consequently, when the hand contacts the induction motor, the capacitance between the hand and the sensing electrode has a relatively small impact and can be ignored. This improves the accuracy of mutual inductance detection between the sensing electrode and the excitation electrode and reduces interference between adjacent sensing areas, significantly improving the off-hand detection accuracy of each zone.

[0024] The steering wheel cover provided in this application has the off-hand sensing structure as described above, and therefore also has the advantages described above; the steering wheel cover is used to cover the steering wheel, which can improve the accuracy and sensitivity of the detection of the driver's off-hand state when holding the steering wheel, and improve driving safety. Attached Figure Description

[0025] To more clearly illustrate the embodiments of this application, the relevant drawings will be briefly described below. It is understood that the drawings described below are only for illustrating some embodiments of this application, and those skilled in the art can obtain many other technical features and connections not mentioned herein based on these drawings.

[0026] Figure 1 This is a schematic diagram of one embodiment of the off-hand sensing structure of this application;

[0027] Figure 2 for Figure 1 Wiring diagram of the excitation electrode;

[0028] Figure 3 This is a schematic diagram of another embodiment of the hands-free sensing structure.

[0029] Figure 4 This is a cross-sectional schematic diagram of the edge portion of the off-hand sensing structure of this application;

[0030] Figure 5 This is a cross-sectional schematic diagram of the steering wheel sleeve installed on the steering wheel according to this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Sensing electrode; 101. First sensing segment; 102. Second sensing segment; 11. First sensing area; 12. Second sensing area; 13. Third sensing area; 14. Fourth sensing area; 15. Fifth sensing area; 16. Sixth sensing area;

[0033] 200. Excitation electrode;

[0034] 300. Insulation layer; 301. Base layer; 302. Edge wrapping layer;

[0035] 401. First suture; 402. Second suture; 403. Third suture; 404. Fourth suture;

[0036] 500. Body; 501. Opening; 502. Edge binding; 503. Wiring port;

[0037] 600. Steering wheel. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0039] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0041] Before introducing the embodiments of this application, the inventors will further explain the principle of HOD off-hand detection.

[0042] Most existing hands-free sensing technologies use the principle of current inductance for detection, which is based on the principle of capacitive sensors. They determine the approach or contact of an object by detecting changes in the capacitance between electrodes. During hands-free detection, when a hand touches the detection electrodes on the steering wheel, the capacitance between the electrodes changes, generating a feedback signal to determine when the hand has been removed.

[0043] In this application, the inventors propose a detection scheme based on the mutual inductance principle of two electrodes. Specifically, the excitation electrode 200 in the embodiment of this application surrounds the sensing electrode 100, where the excitation electrode 200 is used to generate an excitation signal and the sensing electrode 100 is used to generate a detection signal.

[0044] The sensing electrode 100 and the excitation electrode 200 are set in the corresponding area of ​​the steering wheel. When the hand touches or holds the steering wheel, the sensing electrode 100 and the excitation electrode 200 will be coupled. At this time, the excitation signal on the excitation electrode 200 will affect the detection signal on the sensing electrode 100 through the coupling relationship. The sensing electrode 100 will generate a feedback signal according to the influence of its detection signal, and then make a judgment on whether the hand is off.

[0045] Specifically, the excitation signal generated on the excitation electrode 200 is out of phase with the detection signal generated on the sensing electrode 100. When the hand touches or grips the steering wheel, and the sensing electrode 100 and the excitation electrode 200 are coupled, the detection signal on the sensing electrode 100 is canceled out by the excitation signal of the excitation electrode 200. Thus, the sensing electrode 100 generates a feedback signal according to the weakening of its detection signal.

[0046] When the detection signal of the sensing electrode 100 is weakened, it is determined that the driver's hand is in contact with or holding the steering wheel. When the detection signal of the sensing electrode 100 is not weakened, it means that the driver's hand has been removed from the steering wheel and is in a hands-off state.

[0047] However, the aforementioned two-electrode mutual inductance detection scheme also has certain drawbacks.

[0048] On the one hand, when the hand comes into contact with the sensing area, the distance between the hand and the sensing electrode 100 is very small, resulting in a large capacitance between the hand and the sensing electrode 100. The capacitance between the hand and the sensing electrode 100 will inevitably affect the mutual inductance detection between the sensing electrode 100 and the excitation electrode 200, thereby reducing the accuracy of the mutual inductance detection between the electrodes.

[0049] On the other hand, during the zonal detection process, since multiple sensing electrodes 100 are set up, a large capacitance will also be generated between the sensing electrodes 100 that are close to each other. This will also affect the mutual inductance detection between the sensing electrodes 100 and the excitation electrode 200, reduce the accuracy of mutual inductance detection between electrodes in each sensing area, and cause interference to adjacent sensing areas, resulting in the problem of zonal misjudgment during detection.

[0050] Based on the above description, the technical solutions in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0051] Example 1

[0052] This embodiment provides a hands-free sensing structure that can be applied to handheld objects such as steering wheels to determine the hands-free state.

[0053] The following embodiment will use the application of the hands-free sensing structure on the steering wheel 600 as an example to illustrate how the steering wheel 600 can detect when the hands are off, thereby improving driving safety.

[0054] like Figure 1 As shown, the hands-free sensing structure of this embodiment has an insulating layer 300, on which a sensing electrode 100 and an excitation electrode 200 are disposed. The sensing electrode 100 is arranged in most of the area of ​​the steering wheel 600. The area in which the sensing electrode 100 is arranged belongs to the detection area or sensing area. The excitation electrode 200 surrounds the sensing electrode 100. That is, the outer edge of the detection area or sensing area is provided with at least the excitation electrode 200.

[0055] In this embodiment, the sensing electrode 100 is used to generate a detection signal, and the excitation electrode 200 is used to generate an excitation signal. The positions of the sensing electrode 100 and the excitation electrode 200 are arranged such that when a hand touches the steering wheel 600, the hand touches both the sensing electrode 100 and the excitation electrode 200, thus coupling the sensing electrode 100 and the excitation electrode 200. When the hand touching the sensing electrode 100 moves away, the excitation signal of the excitation electrode 200 will disturb the detection signal of the sensing electrode 100. The sensing electrode 100, in response to the disturbance caused by the hand moving away, generates a hand-off signal, thereby determining the hand-off state. For the specific mutual inductance detection principle, please refer to the above description, which will not be repeated here.

[0056] Based on the aforementioned problems with mutual inductance detection, in this embodiment, the inventors have improved the arrangement of the sensing electrode 100 and the excitation electrode 200. In this embodiment, a portion of the sensing electrode 100 is positioned adjacent to the excitation electrode 200, while the distance between other positions of the sensing electrode 100 and the excitation electrode 200 is relatively large. This results in extremely small distances between the sensing electrode 100 and the excitation electrode 200 in these adjacent positions, leading to a larger capacitance between them. Conversely, the capacitance between other positions of the sensing electrode 100 and the excitation electrode 200 is smaller. Using these other positions of the sensing electrode 100 as the sensing area, when a hand contacts the sensing area, the capacitance between the hand and the electrode has a relatively small impact, which can be ignored, thereby improving the accuracy of mutual inductance detection between electrodes.

[0057] Furthermore, such as Figure 1 As shown, in this embodiment, the sensing electrode 100 is divided into a first sensing segment 101 and a second sensing segment 102. The first sensing segment 101 and the second sensing segment 102 are two different parts of the same sensing electrode 100. The second sensing segment 102 is the part of the sensing electrode 100 that is adjacent to the excitation electrode 200 mentioned above, and the first sensing segment 101 is the other part of the sensing electrode 100 mentioned above.

[0058] The area extended by the first sensing segment 101 is the sensing area or detection area. The area extended by the first sensing segment 101 is larger than that of the second sensing segment 102. The first sensing segment 101 is at least partially surrounded by the excitation electrode 200 to ensure that the first sensing segment 101 and the excitation electrode 200 can be coupled when the hand touches the steering wheel 600.

[0059] The second sensing segment 102 is disposed adjacent to the excitation electrode 200. In this embodiment, "displaced adjacent" can be understood as being close to or adjacent to each other. That is, by keeping the second sensing segment 102 and the excitation electrode 200 at a very close distance, this distance must be less than the distance between the first sensing segment 101 and the excitation electrode 200, so as to relatively increase the capacitance between the second sensing segment 102 and the excitation electrode 200.

[0060] When the distance between the first sensing segment 101 and the excitation electrode 200 is greater than the distance between the second sensing segment 102 and the excitation electrode 200, the capacitance formed between the first sensing segment 101 and the excitation electrode 200 is less than the capacitance formed between the second sensing segment 102 and the excitation electrode 200. Thus, when a hand contacts the first sensing segment 101 in the sensing area, the capacitance between the hand and the first sensing segment 101 has a relatively small impact, and the capacitance between the hand and the first sensing segment 101 can be ignored, thereby avoiding the influence of capacitance and improving the accuracy of mutual inductance detection between the first sensing segment 101 and the excitation electrode 200.

[0061] In one embodiment, the second sensing segment 102 is stacked with the excitation electrode 200, and the second sensing segment 102 and the excitation electrode 200 are arranged in close proximity through stacking. In this embodiment, when the excitation electrode 200 surrounds the first sensing segment 101, it forms a certain distance from the first sensing segment 101. The second sensing segment 102 extends from the first sensing segment 101 to the outside of the excitation electrode 200. By folding the second sensing segment 102 to stack it with the excitation electrode 200, the distance between the second sensing segment 102 and the excitation electrode 200 is reduced, thereby increasing the capacitance.

[0062] Preferably, the second sensing segment 102 is disposed at the edge of the insulating layer 300. Folding the edge of the insulating layer 300 to form a edging of the insulating layer 300 can strengthen the structure of the insulating layer 300. At the same time, placing the second sensing segment 102 at the edge of the insulating layer 300 avoids the sensing area, thereby increasing the area of ​​the sensing area and improving the detection efficiency.

[0063] See also Figure 1 The figure shows a first suture line 401, a second suture line 402, a third suture line 403, and a fourth suture line 404 arranged along the edge of the insulating layer 300. The first suture line 401 and the third suture line 403 can be understood as fold lines (folded before sewing). At one end of the insulating layer 300, the excitation electrode 200 is located between the first suture line 401 and the second suture line 402, and the second sensing segment 102 is located outside the first suture line 401. Folding a portion of the second sensing segment 102 along the first suture line 401 allows the second sensing segment 102 to overlap with the excitation electrode 200, thereby reducing the distance between them and achieving the aforementioned effect. The stacked insulating layer 300 can then be sewn together along the first suture line 401 and the second suture line 402 to reinforce the structure.

[0064] Similarly, the third stitch 403 and the fourth stitch 404 are also provided at the other end of the insulation layer 300. Of course, the overlapping stitching of the third stitch 403 and the fourth stitch 404 may not have the second sensing section 102, but is only used for edge wrapping to reinforce the insulation layer 300.

[0065] It is worth mentioning that, in this embodiment, as Figure 1As shown, the second sensing segment 102 is closer to the terminal of the sensing electrode 100 than the first sensing segment 101. When the sensing electrode 100 (i.e., the second sensing segment 102) near the terminal overlaps with the excitation electrode 200, the distance between the excitation electrode 200 and the sensing electrode 100 at the edge is extremely small, resulting in a larger capacitance between the electrodes at the edge. Therefore, when a hand contacts the sensing area, the capacitance between the hand and the electrode has a relatively small impact, thereby improving the accuracy of mutual inductance detection between electrodes. In this embodiment, by placing the area with a larger capacitance close to the terminal, the sensing area is relatively far away from the terminal, which can better avoid the generation of a large capacitance in the sensing area and avoid the impact of capacitance on detection accuracy.

[0066] Please see Figure 5 The wiring terminal (wiring port 503) is generally set at the edge of the insulation layer 300 to facilitate wiring, which also allows the second sensing section 102 to be set at the side, providing space for the first sensing section 101.

[0067] In one embodiment, the second sensing segment 102 extends from the first sensing segment 101 to the outside of the area surrounded by the excitation electrode 200 and extends along the edge of the insulating layer 300. It is understood that in this embodiment, the excitation electrode 200 needs to be distributed along the edge of the insulating layer 300 in order to surround the sensing electrode 100.

[0068] In this embodiment, the excitation electrode 200 can be a wire. For a clearer understanding... Figure 1 and Figure 3 The routing method of the excitation electrode 200. Figure 2 The diagram shows the specific routing of the excitation electrode 200, which extends to each edge of the insulating layer 300. To achieve coverage of each area, the excitation electrode 200 is wound in a double-row configuration. Because the excitation electrode 200 extends to the edge of the insulating layer 300, this may result in the absence of sensing electrodes 100 at some edge locations, leading to a lack of detection at certain edge positions.

[0069] Therefore, the second sensing segment 102 in this embodiment extends to the edge portion of the insulating layer 300 involved by the excitation electrode 200, thereby corresponding to and being closely arranged with all the excitation electrodes 200 located at the edge of the insulating layer 300. This achieves the effect of improving detection accuracy mentioned above in this embodiment, and also enables the edge position of the insulating layer 300 to have detection function, avoiding detection blind spots.

[0070] like Figure 4As shown, in one embodiment, the insulating layer 300 of the off-hand sensing structure includes a base layer 301 and an edge layer 302. The first sensing segment 101 and the excitation electrode 200 are respectively disposed on the base layer 301; the edge layer 302 is disposed on the edge of the base layer 301 and stacked with it, and the second sensing segment 102 is disposed on the edge layer 302. This achieves the stacked arrangement of the second sensing segment 102 and the excitation electrode 200, the effect of which will not be elaborated here. It should be noted that, as shown in the figure, the distance between the second sensing segment 102 and the excitation electrode 200 should be less than the distance between the first sensing segment 101 and the excitation electrode 200.

[0071] Of course, in some embodiments, the hands-free sensing structure is not limited to having an insulating layer 300; it may only have a sensing electrode 100 and an excitation electrode 200, with the sensing electrode 100 and excitation electrode 200 respectively disposed inside the hub of the steering wheel 600 or on the surface of other objects, achieving the same effect. The focus of this embodiment is on the relative relationship between the sensing electrode 100 and the excitation electrode 200, and not on the carrier on which they are disposed.

[0072] In this embodiment, the sensing lines of the first sensing segment 101 are arranged at equal intervals within the sensing area; preferably, the spacing between the sensing lines of the first sensing segment 101 is greater than the spacing between the excitation electrodes 200, so that the first sensing segment 101 can be laid over a larger area, thereby increasing the area of ​​the sensing region.

[0073] In one embodiment, to achieve zone detection of the steering wheel 600, multiple sensing electrodes 100 are provided, each sensing electrode 100 extending within a preset area, and an excitation electrode 200 extending along the edge of the preset area and at least partially surrounding each sensing electrode 100. Each sensing electrode 100 performs an independent detection function within the preset area.

[0074] like Figure 2 and Figure 3 As shown, the sensing electrode 100 has six electrodes, each including a conductive wire. The conductive wire is arranged from a first side to a second side within a preset area, and then folded back to the first side, repeating this arrangement. The conductive wire can be arranged in a straight line or a curve. The six conductive wires respectively form six detection areas: a first sensing area 11, a second sensing area 12, a third sensing area 13, a fourth sensing area 14, a fifth sensing area 15, and a sixth sensing area 16. The excitation electrode 200 is arranged according to... Figure 2 The wiring pattern sequentially surrounds these 6 detection areas.

[0075] Based on the above description, when the conductive wires of adjacent sensing areas are close to each other, they will also generate capacitance between them. If the spacing between them is large, a detection blind zone will occur, while if the spacing is small, the capacitance will be large, which will interfere with the mutual inductance detection effect.

[0076] In this embodiment, by stacking the second sensing segment 102 and the excitation electrode 200 as described above, the capacitance is concentrated at the edge of the detection area. This results in a larger capacitance between the second sensing segment 102 of the sensing electrode 100 and the excitation electrode 200 at the edge. Therefore, when the hand comes into contact with the first sensing segment 101 in the sensing area, the capacitance between the hand and the first sensing segment 101 has a relatively small impact and can be ignored. This improves the accuracy of mutual inductance detection between electrodes, reduces interference between adjacent sensing areas, and greatly improves the hand-off detection accuracy of each zone.

[0077] Example 2

[0078] This embodiment also provides a steering wheel cover, which is equipped with the hands-off sensing structure mentioned in the above embodiment. The steering wheel cover is detachably connected to the steering wheel 600 and is used for assembling the hands-off detection function of the steering wheel 600.

[0079] like Figure 5 As shown, the steering wheel cover has a cover body 500, which can be a traditional steering wheel cover structure, such as leather or silicone. The cover body 500 has an opening 501, through which it can be detachably fitted onto the surface of the steering wheel 600, and can be freely installed and removed as needed.

[0080] The sleeve body 500 has an off-hand sensing structure as described above on its interior or surface. The second sensing segment 102 in the off-hand sensing structure is located close to the excitation electrode 200 at the edge of the opening 501 of the sleeve body 500. The first sensing segment 101 is laid in the middle and most other parts of the sleeve body 500 to ensure a large detection area.

[0081] In this embodiment, as Figure 5 As shown, the opening 501 of the cover body 500 has a edging 502 at its edge. The second sensing segment 102 is disposed within the edging 502 and is stacked with the excitation electrode 200. The edging 502 has a small area and does not occupy the area of ​​the sensing area, allowing the second sensing segment 102 to be disposed adjacent to the excitation electrode 200, thus improving the accuracy of the steering wheel cover's hand-off detection. Furthermore, the edging 502 reinforces the structure of the cover body 500, improving product quality.

[0082] The edge of the opening 501 of the sleeve body 500 is also provided with a wiring port 503. Multiple sensing electrodes 100 and excitation electrodes 200 extend to the wiring port 503. The wiring port 503 is detachably connected to an external signal source to ensure the electrical connection of each electrode.

[0083] In this embodiment, the sleeve body 500 further includes one or more of an outer skin layer, a rubber layer, or a shielding layer. The structure of the sleeve body 500 is common knowledge in the art, and this embodiment does not limit it to a single structure.

[0084] The steering wheel cover provided in this embodiment has the off-hand sensing structure as described above, and therefore also has the advantages described above. The steering wheel cover is used to cover the steering wheel 600, which can improve the accuracy and sensitivity of the off-hand state detection when the driver holds the steering wheel, and improve driving safety.

[0085] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0086] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A hands-off sensing structure, characterized by, The hand-off sensing structure comprises: a sensing electrode (100) generating a hand-off signal in response to a disturbance of the sensing electrode (100) by an object moving away from the sensing electrode (100); an excitation electrode (200) capable of coupling with the sensing electrode (100) when the object contacts the sensing electrode (100) and forming a disturbance of the sensing electrode (100) when the object contacting the sensing electrode (100) moves away from the sensing electrode (100); the sensing electrode (100) comprises: a first sensing section (101) at least partially surrounded by the excitation electrode (200); a second sensing section (102) disposed adjacent to the excitation electrode (200), a capacitance formed between the first sensing section (101) and the excitation electrode (200) being smaller than a capacitance formed between the second sensing section (102) and the excitation electrode (200).

2. The off-hand sensing structure of claim 1, wherein, The second sensing section (102) is disposed in a stack with the excitation electrode (200).

3. The off-hand sensing structure of claim 1, wherein, The second sensing section (102) extends to a terminal end.

4. The off-hand sensing structure of claim 2, wherein, The hand-off sensing structure further comprises an insulating layer (300), the insulating layer (300) comprising: a base layer (301) on which the first sensing section (101) and the excitation electrode (200) are disposed; an edge covering layer (302) disposed on an edge of the base layer (301) and in a stack with the base layer (301), the second sensing section (102) being disposed on the edge covering layer (302).

5. The off-hand sensing structure of claim 4, wherein, The second sensing section (102) extends from the first sensing section (101) to an area outside the excitation electrode (200) and along an edge of the insulating layer (300).

6. The off-hand sensing structure of any one of claims 1 to 5, wherein, A plurality of sensing electrodes (100) are provided, each of the sensing electrodes (100) being arranged to extend in a preset area, the excitation electrode (200) extending along an edge of the preset area and at least partially surrounding each of the sensing electrodes (100).

7. The off-hand sensing structure of claim 6, wherein, At least part of the excitation electrode (200) extends between two adjacent sensing electrodes (100).

8. The off-hand sensing structure of claim 6, wherein, Each of the sensing electrodes (100) comprises a conductive wire arranged to extend from a first side to a second side in the preset area and then back to the first side, and so on.

9. A steering wheel cover, characterized by The hand-off sensing structure comprises: a sleeve body (500) having an opening (501) and being detachably disposed on a surface of a steering wheel (600); The hand-off sensing structure according to any one of claims 1 to 8 is disposed on the sleeve body (500), and the second sensing section (102) and the excitation electrode (200) are disposed adjacent to each other at an edge of the opening (501) of the sleeve body (500).

10. The steering wheel cover of claim 9, wherein, An edge of the opening (501) of the sleeve body (500) has an edge covering (502), the second sensing section (102) is disposed in the edge covering (502) and in a stack with the excitation electrode (200).

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