阅读说明：本技术 离手检测方向盘、车辆及离手检测方法 (Hands-off detection steering wheel, vehicle and hands-off detection method ) 是由 赵永飞 路飞飞 孙悦 于 2021-10-27 设计创作，主要内容包括：本发明提供了一种离手检测方向盘、车辆及离手检测方法,离手检测方向盘包括方向盘骨架、发泡层和传感器组件,传感器组件被支撑在方向盘骨架的把圈外周,传感器组件与方向盘骨架之间具有间隙,传感器组件和方向盘骨架一体发泡并形成发泡层,且传感器组件和方向盘骨架的把圈外周均置于发泡层中。本发明实施例通过将传感器组件和方向盘骨架一体发泡并形成发泡层,可以将传感器组件的线束一体设置在发泡层内,从而可以克服未改进前的技术方案中布线困难的问题。(The invention provides a hands-off detection steering wheel, a vehicle and a hands-off detection method. According to the embodiment of the invention, the sensor assembly and the steering wheel framework are integrally foamed to form the foaming layer, so that the wiring harness of the sensor assembly can be integrally arranged in the foaming layer, and the problem of difficult wiring in the technical scheme before improvement can be solved.)

1. The utility model provides a leave hand and detect steering wheel, includes steering wheel skeleton (10), foaming layer (20) and sensor module (30), its characterized in that, sensor module (30) are supported the circle periphery of steering wheel skeleton (10), sensor module (30) with the clearance has between steering wheel skeleton (10), sensor module (30) with steering wheel skeleton (10) an organic whole foaming and formation foaming layer (20), just sensor module (30) with the circle periphery of steering wheel skeleton (10) is all arranged in foaming layer (20).

2. The hands-off detection steering wheel according to claim 1, wherein the sensor assembly (30) comprises a plurality of trunk wires extending in the same direction as the grip rings and a plurality of branch wires for connecting the trunk wires, wherein the trunk wires and the branch wires form a capacitance sensing surface for detecting whether a hand is in contact with the steering wheel.

3. The steering wheel according to claim 2, wherein the number of the trunk wires is three, each trunk wire is arc-shaped, the three trunk wires are respectively located on the top side, the inner side and the outer side of the grip ring, and the extending direction of each branch wire passes through the center of the trunk wire located on the inner side.

4. A hands-free steering wheel according to claim 3, wherein the number of sensor assemblies (30) is four, the four sensor assemblies (30) being located at the front left position, the front right position, the rear left position and the rear right position of the grip ring, respectively.

5. The steering wheel according to any one of claims 2 to 4, wherein the sensor assembly (30) is supported on the outer circumference of the grip ring of the steering wheel frame (10) by a support bracket (40), one end of the support bracket (40) being connected to the trunk wire and/or the branch wires, and the other end of the support bracket (40) being clamped on the outer circumference of the grip ring.

6. The steering wheel for detecting the departure of a hand from one hand as claimed in claim 5, wherein the supporting frame (40) comprises a first bracket (41), the first bracket (41) comprises a first elastic clamping arm (411) and a first connecting portion (412), the cross section of the first elastic clamping arm (411) is preferably arc-shaped, the first elastic clamping arm (411) can be clamped with the handle ring of the steering wheel frame (10), one end of the first connecting portion (412) is connected with the main wire and/or the branch wire, and the other end of the first connecting portion (412) is connected with the outer side wall of the first elastic clamping arm (411).

7. The steering wheel for detecting the separation of the hands of a user according to claim 6, wherein the supporting frame (40) further comprises a second support (42) arranged opposite to the first support (41), the second support (42) comprises a second elastic clamping arm (421) and a second connecting portion (422), the cross section of the second elastic clamping arm (421) is in a shape of a major arc, the second elastic clamping arm (421) can be matched with the first elastic clamping arm (411) in a clamping manner to form a clamping ring structure, the clamping ring structure can be clamped with the periphery of the handle ring, one end of the second connecting portion (422) is connected with the trunk wire and/or the branch wires, and the other end of the second connecting portion (422) is connected with the outer side wall of the second elastic clamping arm (421).

8. A vehicle comprising a vehicle body, a hands-off detection steering wheel and a control assembly, wherein the hands-off detection steering wheel is the hands-off detection steering wheel of any one of claims 1 to 7, the hands-off detection steering wheel is mounted in the vehicle body, and the control assembly is disposed in the vehicle body and electrically connected to a sensor assembly (30) in the hands-off detection steering wheel.

9. The vehicle of claim 8, characterized in that the control assembly comprises:

a microcontroller;

and the special capacitance sensing chip is electrically connected with the microcontroller and is electrically connected with a sensor component (30) in the hand-off detection steering wheel through a sensor channel protection circuit.

10. A hands-off detection method applied to the vehicle recited in claim 9, characterized by comprising:

firstly, a capacitance sensing special chip acquires a capacitance signal of a sensor assembly (30) through a sensor channel protection circuit;

secondly, when the capacitance signal value changes, the capacitance sensing special chip collects the changed capacitance signal and correspondingly generates a digital signal;

and step three, the microcontroller receives and processes the digital signal, so as to judge whether the hand of the driver is held on the hand-off detection steering wheel.

Technical Field

The specification relates to the technical field of vehicles, in particular to a hand-off detection steering wheel, a vehicle and a hand-off detection method.

Background

Current steering wheel designs may include one or more sensor pads around the rim of the steering wheel frame that are configured to detect the presence of the driver's hands using capacitive sensing. Known sensor mats include wire loops stitched to a fabric or foam substrate. The steering wheel frame, which is typically made of metal (such as magnesium alloy or steel), may be a source of interference for the signals in the sensing mat.

Thus, existing sensor mats are very time consuming to manufacture, the design of which includes a seam layout designed for the sensors and a seam layout designed for the shield, each layout being on a separate sensor mat that must fit correctly on the complex curved shape of the steering wheel rim. In addition, the pattern needs to be redesigned according to which regions should provide sensing and the steering wheel specifications of the vehicle manufacturer. In addition, the manufacturing process and available materials limit the ability to use the available space on the base substrate.

Disclosure of Invention

In view of this, embodiments of the present disclosure provide a hand-off detection steering wheel, a vehicle, and a hand-off detection method, so as to achieve the purpose of reducing the difficulty in wiring a sensor assembly.

The embodiment of the specification provides the following technical scheme: the utility model provides a leave hand detection steering wheel, includes steering wheel skeleton, foaming layer and sensor module, and sensor module is supported in the circle periphery of steering wheel skeleton, has the clearance between sensor module and the steering wheel skeleton, and sensor module and the integrative foaming of steering wheel skeleton form the foaming layer, and the circle periphery of sensor module and steering wheel skeleton all arranges the foaming layer in.

Furthermore, the sensor assembly comprises a plurality of main metal wires extending in the same direction as the handle ring and a plurality of branch metal wires used for connecting the main metal wires, and the plurality of main metal wires and the plurality of branch metal wires form a capacitance sensing surface used for detecting whether the hand is in contact with the capacitance sensing surface.

Furthermore, the number of the trunk metal wires is three, each trunk metal wire is arc-shaped, the three trunk metal wires are respectively positioned at the top side, the inner side and the outer side of the handle ring, and the extending direction of each branch metal wire penetrates through the circle center of the trunk metal wire positioned at the inner side.

Further, the number of the sensor assemblies is four, and the four sensor assemblies are respectively positioned at the left front position, the right front position, the left rear position and the right rear position of the handle ring.

Furthermore, the sensor assembly is supported on the periphery of a handle ring of the steering wheel framework through a support frame, one end of the support frame is connected with the main wire and/or the branch wires, and the other end of the support frame is clamped on the periphery of the handle ring.

Further, the support frame includes first support, and first support includes first elastic clamping arm and first connecting portion, and the cross-section of first elastic clamping arm is the major arc shape, and first elastic clamping arm can be connected with the collar joint of steering wheel skeleton, and first connecting portion one end is connected with trunk wire and/or branch's wire, and the first connecting portion other end is connected with the lateral wall of first elastic clamping arm.

Furthermore, the support frame still includes the second support that sets up in opposite directions with first support, and the second support includes second elastic clamping arm and second connecting portion, and the cross-section of second elastic clamping arm is excellent arc, and second elastic clamping arm can form the snap ring structure with first elastic clamping arm joint cooperation, and the snap ring structure can press from both sides tightly with the circle periphery, and second connecting portion one end is connected with trunk wire and/or branch's wire, and the second connecting portion other end is connected with the lateral wall of second elastic clamping arm.

The invention also provides a vehicle which comprises a vehicle body, the hands-off detection steering wheel and a control assembly, wherein the hands-off detection steering wheel is the hands-off detection steering wheel, the hands-off detection steering wheel is installed in the vehicle body, and the control assembly is arranged in the vehicle body and is electrically connected with the sensor assembly in the hands-off detection steering wheel.

Further, the control assembly includes: a microcontroller; the special capacitive sensing chip is electrically connected with the microcontroller and is electrically connected with a sensor assembly in the off-hand detection steering wheel through a sensor channel protection circuit.

Furthermore, the invention also provides a hand-off detection method, which is applied to the vehicle and comprises the following steps: firstly, a capacitance sensing special chip acquires a capacitance signal of a sensor assembly through a sensor channel protection circuit; secondly, when the capacitance signal value changes, the capacitance sensing special chip collects the changed capacitance signal and correspondingly generates a digital signal; and step three, the microcontroller receives and processes the digital signal, so as to judge whether the hand of the driver is held on the hand-off detection steering wheel.

Compared with the prior art, the beneficial effects that can be achieved by the at least one technical scheme adopted by the embodiment of the specification at least comprise: according to the embodiment of the invention, the sensor assembly and the steering wheel framework are integrally foamed to form the foaming layer, so that the wiring harness of the sensor assembly can be integrally arranged in the foaming layer, and the problem of difficult wiring in the technical scheme before improvement can be solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a sensor assembly of an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a support frame according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a control assembly according to an embodiment of the present invention.

Reference numbers in the figures: 10. a steering wheel armature; 20. a foamed layer; 30. a sensor assembly; 31. a trunk wire; 32. a branched wire; 40. a support frame; 41. a first bracket; 411. a first resilient clamping arm; 412. a first connection portion; 42. a second bracket; 421. a second resilient clamping arm; 422. a second connecting portion.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present application, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number and aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.

It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.

In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.

As shown in fig. 1 to 3, an embodiment of the present invention provides a hands-off detection steering wheel, including a steering wheel frame 10, a foam layer 20, and a sensor assembly 30, wherein the sensor assembly 30 is supported at the outer periphery of a grip ring of the steering wheel frame 10, a gap is provided between the sensor assembly 30 and the steering wheel frame 10, the sensor assembly 30 and the steering wheel frame 10 are integrally foamed to form the foam layer 20, and the outer peripheries of the sensor assembly 30 and the grip ring of the steering wheel frame 10 are both disposed in the foam layer 20.

In the embodiment of the present invention, the sensor assembly 30 and the steering wheel frame 10 are integrally foamed to form the foamed layer 20, so that the wiring harness of the sensor assembly 30 can be integrally arranged in the foamed layer 20, thereby overcoming the difficulty of wiring in the prior art.

As shown in fig. 2, in the embodiment of the present invention, the sensor assembly 30 includes a plurality of trunk wires 31 extending in the same direction as the grip ring and a plurality of branch wires 32 for connecting the trunk wires, the trunk wires 31 and the branch wires 32 form a capacitive sensing surface for detecting whether a hand is in contact with the hand, the capacitive sensing surface can conduct a periodic voltage signal to form an electric field radiated from the grip ring, and when a human hand grasps the grip ring, the distribution of the electric field is changed, so as to achieve the purpose of detecting the hand being away from the hand.

In the embodiment of the invention, the grid structure formed by the plurality of main wires 31 and the plurality of branch wires 32 replaces the traditional steering wheel sensor pad, and the purpose of off-hand detection is realized by checking the capacitance change of the grid structure and the external form.

In this embodiment, the plurality of trunk wires 31 and the plurality of branch wires 32 form a serpentine structure, that is, the plurality of trunk wires 31 are arranged in parallel and form an arc structure having an opening, and the plurality of branch wires 32 are arranged at intervals along the extending direction of the trunk wires 31 for connecting and fixing the plurality of trunk wires 31.

Preferably, the trunk metal wire and the branch metal wire are both high in rigidity, so that the trunk metal wire and the branch metal wire are not easy to deform in the installation, arrangement and foaming processes, and the stability of the capacitance sensing surface is ensured.

As shown in fig. 2, there are three trunk wires 31, each trunk wire 31 is arc-shaped (in a preferred embodiment, semicircular), the three trunk wires 31 are respectively located at the top side, the inner side and the outer side of the handle ring, the wires located at the top side are correspondingly and fixedly connected with the middle part of each branch wire 32, and the two trunk wires 31 located at the inner side and the outer side are correspondingly and fixedly connected with the two ends of each branch wire 32.

Of course, the present embodiment is not limited to the above structure, and for example, the number of the trunk wires 31 may be increased or decreased according to different needs. Or the shape and structure of the trunk wire 31 and the branch wires 32 are changed according to different needs, and a one-to-one correspondence is not described here, but the above embodiments are all within the scope of the present application.

Preferably, the extending direction (extending plane) of each branch wire 32 passes through the center of the trunk wire 31 located on the inner side. In this embodiment, the centers of the three main wires 31 are the same and are the centers of the handle rings. The embodiment of the invention can ensure that the sensor components 30 are uniformly distributed on the handle ring, thereby achieving the purpose of improving the detection precision.

In an embodiment of the present invention, there are two sensor assemblies 30, each sensor assembly 30 is a full-circle structure, and the two sensor assemblies 30 can completely cover the periphery of the handle ring, so as to achieve the purpose of completely covering the handle ring, thereby improving the accuracy of the off-hand detection.

In another embodiment of the present invention, there are four sensor assemblies 30, and each of the four sensor assemblies 30 has a semicircular structure, and the four sensor assemblies 30 are respectively located at a front left position, a front right position, a rear left position and a rear right position of the handle ring.

In the third embodiment of the present invention, there are three sensor assemblies 30, and a mixed use of a full circle and a semicircular structure can be adopted to cover the grip ring in a full circle.

Preferably, the sensor assembly 30 may be provided in plurality, and arranged in sequence along the circumferential direction of the grip ring so as to completely cover the entire circumference of the grip ring.

It should be noted that the sensor assemblies 30 are isolated from each other to avoid interference, so that the device can operate normally. And each sensor assembly 30 extends through an extension structure into the air bag mounting cavity in the middle of the steering wheel and can be connected to the control assembly.

The sensor assembly 30 in this embodiment further comprises a sensing unit arranged to provide the outer contour surface of the above-mentioned lattice structure.

As shown in fig. 3, the steering wheel for detecting the separation of the hands in the embodiment of the present invention further includes a support frame 40, the sensor assembly 30 is supported on the periphery of the grip ring of the steering wheel frame 10 through the support frame 40, one end of the support frame 40 is connected to the trunk wire and/or the branch wire, and the other end of the support frame 40 is clamped on the periphery of the grip ring.

In the embodiment of the present invention, the supporting frame 40 is made of an insulating material, for example, plastic, and the sensor assembly 30 is fixed on the steering wheel frame 10 by using the supporting frame 40, so that the steering wheel frame 10 of the sensor assembly 30 can be effectively arranged at intervals to achieve the purpose of insulation.

In this embodiment, all of the branch wires 32 are spaced from the steering wheel armature 10 by a gap distance of at least 2mm to ensure that the metal portions of the sensor assembly 30 do not contact the armature.

Specifically, the support bracket 40 includes a first bracket 41 and a second bracket 42. The first bracket 41 comprises a first elastic clamping arm 411 and a first connecting part 412, the cross section of the first elastic clamping arm 411 is in a major arc shape, the first elastic clamping arm 411 can be clamped with a handle ring of the steering wheel framework 10, one end of the first connecting part 412 is connected with a main wire and/or a branch wire, and the other end of the first connecting part 412 is connected with the outer side wall of the first elastic clamping arm 411; the second support 42 includes second resilient clamping arm 421 and second connecting portion 422, and the cross-section of second resilient clamping arm 421 is excellent arc, and second resilient clamping arm 421 can form the snap ring structure with first resilient clamping arm 411 joint cooperation, and the snap ring structure can press from both sides the circle periphery tightly, second connecting portion 422 one end and trunk wire and/or branch wire is connected, and the second connecting portion 422 other end is connected with the lateral wall of second resilient clamping arm 421.

In this embodiment, the opening of the first resilient clamping arm 411 and the opening of the second resilient clamping arm 421 are disposed opposite to each other so that the grip ring is held in the first resilient clamping arm 411 and the first resilient clamping arm 411 is held in the second resilient clamping arm 421 to form the snap ring structure.

The opening of the first resilient clamping arm 411 and the opening of the second resilient clamping arm 421 are disposed opposite to each other to prevent the ring from coming off, thereby increasing the assembly stability of the embodiment of the present invention.

Of course, the present embodiment is not limited to the above structure, and the first elastic clamp arm 411 and the second elastic clamp arm 421 may also adopt other structural forms as long as they can be fixed to the grip ring of the steering wheel frame 10.

It should be noted that, in the present embodiment, the contour surface of the foam layer 20 is covered with the roll skin to improve the holding feeling of the driver, and the roll skin further has the anti-slip layer to effectively prevent slipping.

The embodiment of the invention also provides a vehicle which comprises a vehicle body, the hands-off detection steering wheel and a control assembly, wherein the hands-off detection steering wheel is the hands-off detection steering wheel, the hands-off detection steering wheel is installed in the vehicle body, and the control assembly is arranged in the vehicle body and is electrically connected with the sensor assembly 30 in the hands-off detection steering wheel.

The capacitance change detection of the sensor assembly 30 can be realized through the control assembly, so that whether the palm of the driver leaves the steering wheel or not is analyzed according to the change amount, and when the palm of the driver leaves, the control assembly can send out a warning control signal to act on the acousto-optic generating device so as to achieve the purpose of reminding.

As shown in fig. 4, the control component includes a microcontroller and a capacitance sensing dedicated chip. The special capacitive sensing chip is electrically connected with the microcontroller, and the special capacitive sensing chip is electrically connected with the sensor assembly 30 in the hands-off detection steering wheel through the sensor channel protection circuit.

In operation, the capacitive sensing dedicated chip (capacitive sensing ASIC) collects the capacitive signal of the sensor module 30, and when the steering wheel is held by the driver's hand, the capacitive signal changes to sense whether the steering wheel is held by the driver's hand. The special capacitive sensing chip collects signals on the sensor assembly 30 through the sensor channel protection circuit, when the capacitance of the sensor assembly 30 changes, the special capacitive sensing chip converts corresponding changes into digital signals, the microcontroller acquires the signals of the capacitance by reading a register of the special capacitive sensing chip, and whether a steering wheel is separated from a hand or not is judged after data processing is carried out.

Further, in this embodiment, the microcontroller is connected to the system base chip, and the microcontroller is connected to the vehicle sound and light generating device through the system base chip, and is configured to send a warning control signal to the vehicle sound and light generating device when the steering wheel is away from the hand.

Preferably, the present invention further provides a hand-off detection method, which is applied to the above-mentioned vehicle, and the hand-off detection method includes:

firstly, a capacitance sensing special chip acquires a capacitance signal of a sensor assembly 30 through a sensor channel protection circuit;

secondly, when the capacitance signal value changes, the capacitance sensing special chip collects the changed capacitance signal and correspondingly generates a digital signal;

and step three, the microcontroller receives and processes the digital signal, so as to judge whether the hand of the driver is held on the hand-off detection steering wheel. By the aid of the hand-off detection method, whether the palm of the driver is held on the steering wheel or not can be achieved, and when the palm is not held, a corresponding warning prompt is sent out, so that the purpose of improving driving safety is achieved.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the method embodiments described later, since they correspond to the system, the description is simple, and for the relevant points, reference may be made to the partial description of the system embodiments.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.