阅读说明：本技术 具有离手检测功能的方向盘及方向盘系统 (Steering wheel with hand-off detection function and steering wheel system ) 是由 董世熹 陈波 于 2021-08-31 设计创作，主要内容包括：本申请涉及一种具有离手检测功能的方向盘及方向盘系统,其中,该方向盘,包括骨架和处理器；骨架上包覆有包覆层；包覆层上分布有若干双层电阻薄膜片；每个双层电阻薄膜片包括绝缘层、第一导电层以及第二导电层；绝缘层包覆第一导电层和第二导电层,第一导电层和第二导电层之间具有隔空层,第一导电层被施加第一电压,第二导电层被施加第二电压；处理器,分别与每个双层电阻薄膜片的第一导电层和第二导电层连接,用于在人手持握方向盘时,隔空层被挤压使第一导电层和第二导电层接触,利用第一电压和第二电压的电压变化,确定离手检测结果。通过本申请,解决了颠簸路况带来的误判,导致识别准确率低的问题,实现了结构简单,且提高识别准确率。(The application relates to a steering wheel with a hands-off detection function and a steering wheel system, wherein the steering wheel comprises a framework and a processor; the framework is coated with a coating layer; a plurality of double-layer resistance thin film sheets are distributed on the coating layer; each double-layer resistance film sheet comprises an insulating layer, a first conducting layer and a second conducting layer; the insulating layer wraps the first conducting layer and the second conducting layer, a spacing layer is arranged between the first conducting layer and the second conducting layer, a first voltage is applied to the first conducting layer, and a second voltage is applied to the second conducting layer; and the processor is respectively connected with the first conductive layer and the second conductive layer of each double-layer resistance film sheet, and is used for enabling the spacing layer to be extruded to enable the first conductive layer and the second conductive layer to be in contact when a person holds the steering wheel by hands, and determining the hand-off detection result by utilizing the voltage changes of the first voltage and the second voltage. Through the application, the problem that misjudgment caused by bumpy road conditions is caused to be low in identification accuracy is solved, the structure is simple, and the identification accuracy is improved.)

1. A steering wheel with a hands-off detection function is characterized by comprising a framework and a processor; the framework is coated with a coating layer;

a plurality of double-layer resistance thin film sheets are distributed on the coating layer;

each double-layer resistance film sheet comprises an insulating layer, a first conducting layer and a second conducting layer;

the insulating layer covers the first conductive layer and the second conductive layer, a spacing layer is arranged between the first conductive layer and the second conductive layer, a first voltage is applied to the first conductive layer, and a second voltage is applied to the second conductive layer;

and the processor is arranged on the framework, is respectively connected with the first conductive layer and the second conductive layer of each double-layer resistance film sheet, is used for enabling the spacing layer to be extruded to enable the first conductive layer and the second conductive layer to be in contact when a person holds the steering wheel by hands, and determines a hand-off detection result by utilizing the voltage changes of the first voltage and the second voltage.

2. The steering wheel with hands-off detection function according to claim 1, wherein the first voltage is smaller or larger than the second voltage.

3. The steering wheel with hands-off detection function according to claim 1, wherein the insulating layer partially covers the first conductive layer and the second conductive layer.

4. The steering wheel with the hands-off detection function according to claim 1, wherein the insulating layer is made of one or more of genuine leather, artificial leather, rubber, and resin.

5. The steering wheel with the off-hand detection function according to claim 1, wherein the first conductive layer and the second conductive layer are each ITO conductive film glass.

6. The steering wheel with the hand separating detection function according to claim 1, wherein the processor is further configured to obtain distribution position information of each of the double-layer resistive film pieces, and determine a hand separating detection result with a gesture posture according to the voltage changes of the first voltage and the second voltage and the distribution position information.

7. The steering wheel with hands-off detection function according to claim 1, further comprising a leather conductive layer;

the cortex conducting layer is arranged on the coating layer and is used as a dry electrode for electrocardio monitoring.

8. The steering wheel with hands-free detection function according to claim 7, wherein the cortical conductive layer comprises a surface layer with conductivity and a base fabric layer with insulation;

the surface layer is arranged on the base cloth layer and used as a dry electrode for electrocardio monitoring.

9. The steering wheel with the hands-off detection function according to claim 7, further comprising an electrocardiographic detection module;

the electrocardio detection module is arranged between the framework and the coating layer and is connected with the cortex conducting layer and used for carrying out electrocardio monitoring through the cortex conducting layer.

10. A steering wheel system, comprising: a central control module and a steering wheel with hands-off detection functionality according to any of claims 1 to 9;

and the central control module is connected with a processor in the steering wheel and is used for carrying out data interaction with the processor.

Technical Field

The present application relates to the field of automotive technology, and more particularly, to a steering wheel and a steering wheel system having a hands-off detection function.

Background

With the improvement of living standard of people, more and more families begin to own automobiles. The steering wheel is an important part in an automobile steering system, not only is the part steering, but also has more functions, such as sound control, constant-speed cruising, Bluetooth, a running computer and the like, and can be realized through the steering wheel. The hod (hand Off detection) function is one of ADAS (advanced driving assistance systems) and is a function of monitoring whether or not a driver's hand is on a steering wheel for the purpose of safe driving. HOD is also a requirement of automotive automatic driving systems of class L1-L4, and is increasingly being appreciated by more and more whole automobile factories.

At present, in order to save hardware cost, a torque signal of an EPS (electric Power steering) electronic Power steering system is adopted as sensing detection of an HOD scheme, and the EPS scheme is an HOD scheme realized based on an original torque signal of a vehicle. However, on bumpy road conditions, the torque signal is falsely triggered by the back-and-forth swing of the steering wheel, so that the identification accuracy is low.

Aiming at the problem of low identification accuracy caused by misjudgment caused by bumpy road conditions in the related technology, no effective solution is provided at present.

Disclosure of Invention

The embodiment provides a steering wheel with a hands-off detection function and a steering wheel system, so as to solve the problem of low identification accuracy caused by misjudgment caused by bumpy road conditions in the related art.

In a first aspect, the present embodiment provides a steering wheel with a hands-off detection function, which is characterized by comprising a skeleton and a processor; the framework is coated with a coating layer;

a plurality of double-layer resistance thin film sheets are distributed on the coating layer;

each double-layer resistance film sheet comprises an insulating layer, a first conducting layer and a second conducting layer;

the insulating layer covers the first conductive layer and the second conductive layer, a spacing layer is arranged between the first conductive layer and the second conductive layer, a first voltage is applied to the first conductive layer, and a second voltage is applied to the second conductive layer;

and the processor is arranged on the framework, is respectively connected with the first conductive layer and the second conductive layer of each double-layer resistance film sheet, is used for enabling the spacing layer to be extruded to enable the first conductive layer and the second conductive layer to be in contact when a person holds the steering wheel by hands, and determines a hand-off detection result by utilizing the voltage changes of the first voltage and the second voltage.

In some of these embodiments, the first voltage is less than or greater than the second voltage.

In some of these embodiments, the insulating layer partially encapsulates the first and second conductive layers.

In some embodiments, the insulating layer is made of one or more of genuine leather, artificial leather, rubber, and resin.

In some embodiments, the first conductive layer and the second conductive layer are both ITO conductive film glass.

In some embodiments, the processor is further configured to obtain distribution position information of each of the double-layer resistive thin film pieces, and determine a hand-off detection result with a gesture according to the voltage changes of the first voltage and the second voltage and the distribution position information.

In some embodiments, the steering wheel with hands-off detection function provided by this embodiment further includes a cortex conductive layer;

the cortex conducting layer is arranged on the coating layer and is used as a dry electrode for electrocardio monitoring.

In some of these embodiments, the cortical conductive layer includes a base layer having a conductive facing and an insulating base;

the surface layer is arranged on the base cloth layer and used as a dry electrode for electrocardio monitoring.

In some embodiments, the steering wheel with a hands-off detection function provided in this embodiment further includes an electrocardiographic detection module;

the electrocardio detection module is arranged between the framework and the coating layer and is connected with the cortex conducting layer and used for carrying out electrocardio monitoring through the cortex conducting layer.

In a second aspect, there is provided in this embodiment a steering wheel system comprising: a central control module and a steering wheel with a hands-off detection function as described in the first aspect;

and the central control module is connected with a processor in the steering wheel and is used for carrying out related data interaction with the processor.

In some embodiments, the steering wheel system provided in this embodiment further includes a transmission device;

and the transmission device is connected with the central control module and is used for receiving or sending related data.

Compared with the related art, the steering wheel with the hands-off detection function and the steering wheel system are provided in the embodiment, wherein the steering wheel comprises a framework and a processor; the framework is coated with a coating layer; a plurality of double-layer resistance thin film sheets are distributed on the coating layer; each double-layer resistance film sheet comprises an insulating layer, a first conducting layer and a second conducting layer; the insulating layer covers the first conductive layer and the second conductive layer, a spacing layer is arranged between the first conductive layer and the second conductive layer, a first voltage is applied to the first conductive layer, and a second voltage is applied to the second conductive layer; and the processor is arranged on the framework, is respectively connected with the first conductive layer and the second conductive layer of each double-layer resistance film sheet, is used for enabling the first conductive layer and the second conductive layer to be in contact by the extrusion of the spacing layer when a person holds the steering wheel by hands, and determines the hand-off detection result by utilizing the voltage change of the first voltage and the second voltage. The problem of low identification accuracy rate caused by misjudgment of bumpy road conditions in the related technology is solved, and the identification accuracy rate is improved.

The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a steering wheel with a hands-off detection function according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of a double-layer resistive thin film patch provided in accordance with an embodiment of the present application;

FIG. 3 is a cross-sectional view of a cortical conductive layer provided in one embodiment of the present application;

fig. 4 is a block diagram of a steering wheel system according to an embodiment of the present application.

In the figure: 10. a double-layer resistive thin film sheet; 11. an insulating layer; 12. a first conductive layer; 13. a second conductive layer; 14. a spacer layer; 20. a cortical conductive layer; 21. a surface layer; 22. a base cloth layer; 41. a processor; 42. and a central control module.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.

Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. When an element is referred to herein as being "on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, in the present embodiment, a steering wheel with a hands-off detection function is provided, which includes a frame and a processor; the framework is coated with a coating layer;

a plurality of double-layer resistance thin film sheets 10 are distributed on the coating layer;

each of the double-layer resistive thin film sheets 10 includes an insulating layer 11, a first conductive layer 12, and a second conductive layer 13;

the insulating layer 11 covers the first conductive layer 12 and the second conductive layer 13, a gap layer 14 is provided between the first conductive layer 12 and the second conductive layer 13, a first voltage is applied to the first conductive layer 12, and a second voltage is applied to the second conductive layer 13;

and the processor is arranged on the framework, is respectively connected with the first conducting layer 12 and the second conducting layer 13 of each double-layer resistance film sheet 10, and is used for enabling the first conducting layer 12 and the second conducting layer 13 to be contacted by the extrusion of the spacing layer 14 when a hand holds the steering wheel, and determining the hand-off detection result by using the voltage change of the first voltage and the second voltage.

The material of the coating layer may be artificial leather or genuine leather. The cladding layer may completely cover the frame, or may completely cover the frame together with the double-layer resistive thin film sheet 10. Wherein, the double-layer resistance film sheets 10 are uniformly distributed on the coating layer, and a hand can hold a part of the double-layer resistance film sheets 10 when holding the steering wheel normally. Wherein, the circumference of the steering wheel is generally 115cm-130 cm; the diameter of the finger of the adult is 1cm-2 cm; in the present embodiment, the double-layer resistive thin film sheet 10 may have a width of 1cm to 5cm and a length of 1cm to 5 cm. The number may be 10-500 sheets; the double-layer resistance thin film sheets 10 are uniformly distributed on the coating layer in a ring shape. Such as: the width of the double-layer resistance thin film sheet 10 can be 1cm, and the length can be 1 cm; the number may be 240 pieces; is uniformly distributed on the coating layer in a polycyclic shape. In other embodiments, the specification and number of the double-layer resistive film sheets 10 are not limited, such as: the double-layer resistance thin film sheet 10 may have a width of 0.5cm and a length of 0.5 cm; the number may be 480 pieces. The specification parameters of the double-layer resistance film sheet 10 are small, and the more the number is, the higher the accuracy of the identification result of the off-hand detection is.

Each of the two-layer resistive thin film sheets 10 is relatively isolated from each other, and each of the two-layer resistive thin film sheets 10 includes an insulating layer 11, a first conductive layer 12, and a second conductive layer 13. The insulating layer 11 covers the first conductive layer 12 and the second conductive layer 13 in various forms. E.g., fully coated or partially coated; the term "completely cover" means that the insulating layer 11 completely covers the first conductive layer 12 and the second conductive layer 13, the insulating layer 11 does not cover the surfaces of the first conductive layer 12 and the second conductive layer 13 between the isolation layers 14, and when a hand holds the steering wheel, the isolation layers 14 are pressed to make the first conductive layer 12 and the second conductive layer 13 contact with each other, so that the voltage changes of the first voltage in the first conductive layer 12 and the second voltage in the second conductive layer 13 occur, and the hand-off detection result is determined. Wherein, the partial coating means that the insulating layer 11 partially coats the first conductive layer 12 and the second conductive layer 13; for example, the insulating layer 11 longitudinally covers the first conductive layer 12 and the second conductive layer 13; the two transverse ends are exposed; for another example: the insulating layer 11 covers only the outer surface of the first conductive layer 12. The partially-coated insulating layer 11 does not coat the surfaces of the first conductive layer 12 and the second conductive layer 13 between the insulating layers 14, and when a hand holds the steering wheel, the insulating layers 14 are pressed to make the first conductive layer 12 and the second conductive layer 13 contact with each other, so that the voltage change of the first voltage in the first conductive layer 12 and the second voltage in the second conductive layer 13 occurs, and the hand-off detection result is determined. The first change is holding and the second change is leaving the hand. That is, as long as the voltage changes, it indicates that there is a departure from the hand or a holding. In other embodiments, the hand-off detection result may be determined by a specific voltage change, which is not limited.

In this embodiment, the processor is disposed on the framework, and the processor may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA. When different voltages are provided to the first conductive layer 12 and the second conductive layer 13 in the double-layer resistive thin film sheet 10, the first conductive layer 12 and the second conductive layer 13 are contacted by a hand holding the steering wheel, so that the first voltage in the first conductive layer 12 and the second voltage in the second conductive layer 13 are changed. And judging whether the driver leaves the hand by using the voltage change in the double-layer resistance film sheet 10, thereby determining the hand-off detection result. In other embodiments, other circuit implementations, such as logic, may be used.

Compared with the related art, the double-layer resistance film sheet 10 is arranged on the steering wheel, and the processor is arranged on the framework, is respectively connected with the first conducting layer 12 and the second conducting layer 13 of each double-layer resistance film sheet 10, and is used for applying a first voltage to the first conducting layer 12 and applying a second voltage to the second conducting layer 13; when a person holds the steering wheel with his hand, the spacer layer 14 is pressed to bring the first conductive layer 12 into contact with the second conductive layer 13, and the voltage change between the first voltage and the second voltage is used to determine the hand-off detection result. Therefore, the problem of low identification accuracy caused by misjudgment caused by bumpy road conditions in the related technology is solved, and the identification accuracy is improved; the original basic structure of the steering wheel is not changed, the production cost is saved, and the off-hand detection function has no special requirements on the holding state and the hand state of a driver.

In one embodiment, the first voltage is greater than or less than the second voltage. That is to say the first voltage in the first conductive layer 12 and the second voltage in the second conductive layer 13 are not equal. The first conductive layer 12 and the second conductive layer 13 may be supplied with power in various ways.

Specifically, the first conductive layer 12 and the second conductive layer 13 are both connected to a processor, and a first voltage is applied to the first conductive layer 12 and a second voltage is applied to the second conductive layer 13 by the processor. Wherein the first voltage may be greater than the second voltage, and the first voltage may be 4V to 10V; the second voltage may be 0V-3V. The first voltage can be smaller than the second voltage, and the first voltage can be 0V-3V; the second voltage may be 4V-10V.

Specifically, the first conductive layer 12 and the second conductive layer 13 are both connected to a power supply, and a first voltage is applied to the first conductive layer 12 and a second voltage is applied to the second conductive layer 13 by the power supply. Wherein the first voltage may be greater than the second voltage, and the first voltage may be 4V to 10V; the second voltage may be 0V-3V. The first voltage can be smaller than the second voltage, and the first voltage can be 0V-3V; the second voltage may be 4V-10V.

Specifically, the first conductive layer 12 is connected to a processor, a power supply or a central control module, a first voltage is applied to the first conductive layer 12 through the processor, the power supply or the central control module, and the second conductive layer 13 is grounded. The first voltage is greater than the second voltage, wherein the first voltage may be 1V-10V; the second voltage is 0V.

In other embodiments, the second conductive layer 13 may be powered by applying the first voltage to the first conductive layer 12, and this is not an example.

In one embodiment, the insulating layer 11 is made of one or more of genuine leather, artificial leather, rubber, and resin. The insulating layer 11 may be made of the same material as the clad layer. The first conductive layer 12 and the second conductive layer 13 are both ITO conductive film glass.

In one embodiment, in order to be able to detect the gesture of the driver, the success rate of the hands-off detection is further improved. And the processor is further configured to obtain distribution position information of each of the double-layer resistive thin film sheets 10, and determine a hand-off detection result with a gesture posture according to the voltage changes of the first voltage and the second voltage and the distribution position information.

After each double-layer resistance thin film sheet 10 is arranged on the coating layer, each double-layer resistance thin film sheet 10 can be numbered, and the distribution position information of each double-layer resistance thin film sheet 10 with the unique number is recorded; then, according to the voltage change and the distribution position information of the first voltage and the second voltage, the position of the driver holding the horizontal steering wheel can be known, so that the gesture posture can be deduced, and the hand-off detection result with the gesture posture can be determined. Wherein the distribution position information may be coordinate information. For example, the circumference of the steering wheel is 130cm, the width of the double-layer resistive thin film sheet 10 may be 2cm, and the length may be 1 cm; the number of one circle can be 120, and the total number of the distributed three circles of double-layer resistance thin film sheets 10 is 360; then the numbering of the double-layer resistive film sheet 10: 1 is numbered clockwise right above, and the first circle can be 1-1; 1-2; 1-3 to 1-120; the second turn may be 2-1; 2-2; 2-3 to 2-120; the third turn may be 3-1; 3-2; 3-3 to 3-120; for example, when a person holds a steering wheel by hands, the double-layer resistance film sheet is arranged at the position of 1-1; a double-layer resistance film sheet at the 2-1 position; a double-layer resistance film sheet at the 1-2 position; a double-layer resistance film sheet at the 2-2 position; a double-layer resistance film sheet at the position of 1-120; the voltage change of the double-layer resistance film sheet at the 2-120 position indicates that the driver holds the steering wheel directly above with one hand. For another example, when a person holds a steering wheel by hands, the double-layer resistance film sheet is arranged at the position of 1-1; a double-layer resistance film sheet at the 2-1 position; a double-layer resistance film sheet at the 1-2 position; a double-layer resistance film sheet at the 2-2 position; a double-layer resistance film sheet at the position of 1-120; a double-layer resistance film sheet at the position of 2-120; a double-layer resistance film sheet at the position of 1-90; a double-layer resistance film sheet at the position of 2-90; 1-89 position double-layer resistance film sheet; a double-layer resistance film sheet at the position 2-89; a double-layer resistance film sheet at the position 1-91; the voltage change of the double-layer resistance film sheet at the position 2-91 indicates that the driver holds the steering wheel right above with one hand and holds the left end of the steering wheel with the other hand. For another example, when a person holds the steering wheel by hands, the double-layer resistance film sheets are arranged at the positions of 1-30; a double-layer resistance film sheet at the position 2-30; a double-layer resistance film sheet at the position 1-29; a double-layer resistance film sheet at the position 2-29; a double-layer resistance film sheet at the position 1-31; a double-layer resistance film sheet at the position 2-31; a double-layer resistance film sheet at the position of 1-90; a double-layer resistance film sheet at the position of 2-90; 1-89 position double-layer resistance film sheet; a double-layer resistance film sheet at the position 2-89; a double-layer resistance film sheet at the position 1-91; the voltage change of the double-layer resistance film sheet at the 2-91 position indicates that the driver holds the left end of the steering wheel by one hand and holds the right end of the steering wheel by the other hand. Thereby enabling determination of the gesture pose.

In other embodiments, the gesture is determined according to the voltage change and the distribution position information of the first voltage and the second voltage, and the gesture can be recognized by using a well-trained neural network recognition model, so that the recognition efficiency and the recognition accuracy can be improved.

In one embodiment, on the basis of fig. 2, the steering wheel with the hands-off detection function provided by this embodiment further includes a memory; and the memory is arranged on the framework and used for storing related data. The memory may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include memory located remotely from the processor, and these remote memories may be connected to the terminal through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

In one embodiment, on the basis of fig. 2, as shown in fig. 3, the steering wheel with the hands-off detection function provided by this embodiment further includes a cortex conductive layer 20;

the cortex conducting layer 20 is arranged on the coating layer and is used as a dry electrode for electrocardio monitoring.

In particular, the cortical conductive layer 20 is a dry electrode that is not required to be used with a conductive paste, and is primarily used to measure biopotential signals, such as cardiac electrical signals. The cortex conducting layer 20 is annularly distributed on the coating layer and can be arranged in a circle; multiple turns may also be provided. Wherein, the cortical conductive layer 20 at least comprises a conductive surface layer 21 with a net structure; the surface layer 21 having a net structure is prepared based on a polyurethane material, a conductive material, and an auxiliary material. The conductive material may be conductive carbon black, metal particles, metal ions, or the like. Wherein the auxiliary materials comprise a solvent, a dispersant and the like. Different conductive materials require different auxiliary materials, which is not exemplified herein.

In one embodiment, a polyurethane material is selected, and conductive carbon black is added as a filler during preparation; and then adding a solvent and a dispersant to ensure that the conductive carbon black can be uniformly and stably distributed in the polyurethane material. When the carbon black reaches the preset dosage value, the distance between the conductive carbon black particles is very close (0.1nm-0.5 nm). At this time, a voltage difference is generated, and pi electrons of the conductive carbon black particles move by chain transfer. The current can freely move on a conductive loop formed by the structural unit and the secondary particles. The carbon black has conductivity, so the structure is stable, the carbon black is easy to be uniformly mixed with other materials, and a conductive path with a net structure is formed. After the conductive carbon black is added, the surface layer 21 has the conductivity and can be used as a dry electrode for electrocardio monitoring. Specifically, the surface layer 21 contacts the skin through the surface micro-nano structure. Generally, the nano-or micro-scale pillar array can penetrate the stratum corneum of the skin to contact with the skin lining tissue, and a lower electrode-skin interface impedance can be obtained because the stratum corneum with the highest contact impedance is avoided. When the driver holds the steering wheel with both hands, the electrocardiosignal can be collected through the cortex conducting layer 20, and the corresponding physiological index of the driver can be monitored.

Wherein, the relation between the resistance and the carbon black dosage follows an exponential law: r ═ exp (a/W) p;

wherein R represents a material resistance; w represents a carbon black mass fraction; a and p represent constants determined by the material type.

In one embodiment, the cortical conductive layer 20 further includes an insulating scrim layer 22; the base fabric layer 22 is disposed under the base fabric layer 22 as a substrate by a roll coating process.

In one embodiment, on the basis of fig. 2, the steering wheel with the hands-off detection function provided by this embodiment further includes an electrocardiographic detection module;

the electrocardio detection module is arranged between the framework and the coating layer, is connected with the cortex conducting layer 20 and is used for carrying out electrocardio monitoring through the cortex conducting layer 20. The electrocardio detection module is connected with the cortex conducting layer 20, the cortex conducting layer 20 is used as a dry electrode, when a driver holds the steering wheel by two hands, electrocardio signals can be collected through the cortex conducting layer 20, and corresponding physiological indexes of the driver are monitored. The electrocardio monitoring and the hands-off detection are combined, so that the driving safety degree is improved, the health state of a driver can be monitored, and the hidden danger of related diseases can be found in time.

In one embodiment, the electrocardiograph detection module comprises a following unit, a differential amplification circuit, a filter circuit, a secondary amplification circuit and a photoelectric coupling circuit. The follower is connected with the cortical conductive layer 20 and is used for improving the input impedance of the amplifier, so as to improve the common mode rejection ratio and the signal intensity of the patient for electrocardiogram. And the differential amplifying circuit is respectively connected with the following unit and the filter circuit, amplifies the acquired electrocardiosignals and transmits the amplified electrocardiosignals to the filter circuit for filtering. The differential amplifying circuit can adopt a chip with the model number of LF 347N. And the secondary amplifying circuit is respectively connected with the filter circuit and the photoelectric coupling circuit. And the connection is used for carrying out secondary amplification on the filtered electrocardiosignals. The photoelectric coupling circuit is used for realizing the isolation between a human body and electricity and improving the use safety.

It should be noted that the terms "module," "unit," "subunit," and the like as used above may implement a combination of software and/or hardware for implementing predetermined functions. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. The above modules may be functional modules or program modules, and may be implemented by software or hardware. For a module implemented by hardware, the modules may be located in the same processor; or the modules can be respectively positioned in different processors in any combination.

In this embodiment, there is also provided a steering wheel system, as shown in fig. 4, including: a center control module 42 and the steering wheel with the hands-off detection function;

and the central control module 42 is connected with the processor 41 in the steering wheel and is used for performing relevant data interaction with the processor 41.

Compared with the existing steering wheel system, the steering wheel system provided in the embodiment can ensure that the spacing layer 14 is squeezed to enable the first conductive layer and the second conductive layer to be in contact when a person holds the steering wheel by hands, and the hand-off detection result is determined by using the voltage changes of the first voltage and the second voltage, so that the problem of low recognition accuracy caused by misjudgment caused by bumpy road conditions in the related art is solved, and the recognition accuracy is improved; the original basic structure of the steering wheel is not changed, the production cost is saved, and the off-hand detection function has no special requirements on the holding state and the hand state of a driver.

In one embodiment, the central control module 42 may be part of the vehicle's own control system, further reducing costs. The central control module 42 may be used as the processor 41, for example, to be connected to the first conductive layer and the second conductive layer of each of the two-layer resistive film sheets, respectively, so that when a person holds a steering wheel with hands, the spacing layer 14 is pressed to make the first conductive layer and the second conductive layer contact, and the voltage change of the first voltage and the second voltage is used to determine the hand-off detection result.

The central control module 42 may be further configured to obtain distribution position information of each of the double-layer resistive thin film pieces, and determine a hand-off detection result having a gesture posture according to the voltage changes of the first voltage and the second voltage and the distribution position information.

In some embodiments, the steering wheel system provided in this embodiment further includes a transmission device;

the transmission device is connected to the central control module 42, and is configured to receive or transmit related data. The transmission device is used to receive or transmit data via a network. The network described above includes a wireless network provided by a communication provider of the terminal. In one example, the transmission device includes a Network adapter (NIC) that can be connected to other Network devices through a base station to communicate with the internet. In one example, the transmission device may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.

It should be noted that, for specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and optional implementations, and details are not described again in this embodiment.

It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to be limiting. All other embodiments, which can be derived by a person skilled in the art from the examples provided herein without any inventive step, shall fall within the scope of protection of the present application.

It is obvious that the drawings are only examples or embodiments of the present application, and it is obvious to those skilled in the art that the present application can be applied to other similar cases according to the drawings without creative efforts. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.

The term "embodiment" is used herein to mean that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly or implicitly understood by one of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the patent protection. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.