阅读说明：本技术 一种方向盘离手检测及加热组件 (Steering wheel is from hand detection and heating element ) 是由 施锦杰 夏杨江 阮杰阳 于 2021-08-06 设计创作，主要内容包括：本发明公开了一种方向盘离手检测及加热组件,其包括隔离层,电容感应丝以及加热丝,所述电容感应丝布设在隔离层的第一面,所述加热丝铺设在隔离层的第二面,所述电容感应丝与所述加热丝之间在铺设方向上呈交错状分布。本方案整体结构轻薄同时集成方向盘离手检测和加热功能。(The invention discloses a steering wheel hands-off detection and heating assembly which comprises an isolation layer, capacitance induction wires and heating wires, wherein the capacitance induction wires are arranged on a first surface of the isolation layer, the heating wires are arranged on a second surface of the isolation layer, and the capacitance induction wires and the heating wires are distributed in a staggered manner in the laying direction. This scheme overall structure is frivolous integrated steering wheel simultaneously and leaves hand detection and heating function.)

1. Steering wheel is from hand detection and heating element, its characterized in that, including isolation layer, electric capacity response silk and heater strip, electric capacity response silk cloth is established in the first face of isolation layer, the heater strip is laid at the second face of isolation layer, electric capacity response silk with be crisscross form distribution between the heater strip in laying the direction.

2. The steering wheel hands-off detection and heating assembly of claim 1, wherein the capacitive sensing wire is disposed within the steering wheel in a manner that covers the entire steering wheel surface and is remote from the steering wheel metal bracket.

3. The steering wheel hands-off detection and heating assembly according to claim 1 or 2, wherein the heating wires are arranged in the steering wheel on the basis of being distributed with the capacitive sensing wires in a staggered and as dense as possible manner.

4. The steering wheel hands-off detection and heating assembly of claim 1, wherein the capacitive sensing wire and the heating wire are distributed in a sinusoidal manner, respectively.

5. The steering wheel hands-off detection and heating assembly of claim 1, wherein the capacitive sensing wires and the heating wires are distributed in a matrix manner.

6. The steering wheel hands-off detection and heating assembly of claim 1, wherein the capacitive sensing wire and the heating wire are respectively arranged in a cosine array.

7. The steering wheel hands-off detection and heating assembly of claim 1, wherein the isolation layer is a quartz wool layer.

Technical Field

The invention relates to vehicle electronic technology, in particular to electronic technology on a vehicle steering wheel.

Background

The automatic driving technology of the current vehicle is rapidly developed, and some Advanced Driving Assistance Systems (ADAS) have been applied to the vehicle in order to effectively improve the driving safety of the vehicle. Among them, hand-off detection of steering wheel (hereinafter abbreviated as HOD) is one of ADAS, which is also a requirement of automatic driving system of L1-L4 level automobile.

And HOD, namely, whether the hands of the driver leave the steering wheel or not is detected to remind and warn, so that the driving safety is guaranteed. Most current methods for implementing HOD are capacitive sensing methods, that is, HOD is implemented by a capacitive sensor, but in the actual use process, the scheme for implementing detection based on the capacitive sensor has many problems, such as high cost and large occupied space due to complex sensor layout.

The reason for this is that the capacitive sensor has high requirements on the surrounding environment, and the surrounding grounded metal or wire may affect the sensitivity of the capacitive sensor, such as a steering wheel heater wire. Therefore, in the existing scheme, a thick shielding layer is required to be added between the off-hand detection sensor and the heating wire and is used for shielding the influence of the heating wire on the sensor after being electrified. Such a design also increases the thickness of the sensor, resulting in high space requirements for the steering wheel, making it unsuitable for all steering wheel suppliers.

Disclosure of Invention

The invention aims to provide a steering wheel hands-off detection and heating assembly, which is light and thin in overall structure and integrates the functions of steering wheel hands-off detection and heating.

In order to achieve the above purpose, the steering wheel hands-off detection and heating assembly provided by the invention comprises an isolation layer, capacitance induction wires and heating wires, wherein the capacitance induction wires are arranged on a first surface of the isolation layer, the heating wires are laid on a second surface of the isolation layer, and the capacitance induction wires and the heating wires are distributed in a staggered manner in the laying direction.

Furthermore, the capacitive sensing wires are arranged in the steering wheel in a manner of covering the whole surface of the steering wheel and being far away from the metal bracket of the steering wheel.

Further, the heating wires are arranged in the steering wheel on the basis of a mode that the heating wires and the capacitance induction wires are distributed in a staggered mode and are as dense as possible.

Furthermore, the capacitance induction wires and the heating wires are distributed in a sine mode respectively.

Furthermore, the capacitance induction wires and the heating wires are respectively distributed in a matrix mode.

Furthermore, the capacitance induction wire and the heating wire are respectively distributed in a cosine column manner.

Further, the isolation layer is a quartz cotton layer.

Compared with the prior art, the scheme provided by the invention has the following advantages:

(1) compared with the existing design scheme, the scheme saves the shielding layer, enables the sensor inductor to be thinner and thinner, can be smoothly integrated in the steering wheel, and is not influenced in sensitivity.

(2) The scheme has small requirement on the internal space of the steering wheel and is suitable for all steering wheel suppliers.

(3) This scheme has integrateed the steering wheel and has left hand detection and heating function, low cost.

Drawings

The invention is further described below in conjunction with the appended drawings and the detailed description.

FIG. 1 is an illustration of the present example in which the capacitive sense wires and heater wires are distributed in a sinusoidal manner;

FIG. 2 is an illustration of the present embodiment in which the capacitive sensing wires and the heating wires are distributed in a matrix manner;

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

The heating wire in the existing steering wheel is grounded, and the ground has a shielding effect on the capacitor, so that the capacitive sensor used for detecting the out-of-hand position in the steering wheel is influenced by the heating wire after being electrified, and the heating wire and the capacitive sensor are contacted together to influence the sensitivity of the capacitive sensor.

Referring to fig. 1, the invention abandons the scheme of arranging a thick shielding layer, adopts a capacitance sensor integrated with heating wires, introduces quartz wool, arranges the capacitance sensing wires 100 on the first surface of the quartz wool layer, lays the heating wires 200 on the second surface of the quartz wool layer, and simultaneously distributes the capacitance sensing wires and the heating wires in a staggered manner in the laying direction, so that the sensing wires and the grounding heating wires are staggered, thereby achieving the purpose of reducing the shielding effect of grounding on capacitance.

Because the grounded conductor has a great interference effect on the capacitive sensor, in order to reduce the interference, the contact area of the capacitive sensing wire and the heating wire is reduced as much as possible in the layout.

In this respect, the scheme realizes effective reduction of the interference by increasing the distance between the two. On this basis, in order to enlarge the distance between the induction wire and the heating wire as much as possible in a specific narrow space area inside the steering wheel and achieve the purpose of not occupying a large amount of space in the steering wheel, the induction wire and the grounding heating wire are arranged in a staggered manner in the scheme, and the staggered arrangement mode can be multiple, such as the staggered arrangement mode in a sine mode or the staggered arrangement mode in a matrix mode and the like. Taking the staggered distribution in the sine mode as an example, only one point of interference exists at the intersection of the sine between the induction wire and the grounding heating wire which are distributed and arranged in the way, and the whole interference can be reduced to the lowest.

When the steering wheel is arranged heavily, the capacitive sensing wires cover the surface of the whole steering wheel on the basis of the requirement, and are arranged in a mode of being away from the metal support of the steering wheel.

In order to meet the purpose of rapid heating, the heating wires in the scheme are distributed as densely as possible under the condition that the heating wires and the capacitance induction wires are distributed in a staggered mode.

The quartz wool layer in this scheme forms the isolation layer between electric capacity response silk 100 and heater strip 200, and it is good to form the heat-proof quality between them, and the conductivity is low and can not gather the isolation layer that produces the interference to electric capacity.

The quartz wool layer in this scheme forms good parcel structure when the steering wheel is heavily arranged, fixes response silk and heater strip in the steering wheel, and relative position is unmovable to reliability when guaranteeing that whole scheme sets up.

In this embodiment, in addition to the quartz wool layer, an isolation layer made of other materials with low conductivity and good heat insulation may be used between the capacitive sensing wire 100 and the heating wire 200.

The steering wheel off-hand detection and heating assembly formed in the way does not need to be provided with a thick shielding layer, so that the whole assembly is lighter and thinner and can be smoothly integrated in a steering wheel; meanwhile, the induction wires and the grounding heating wires are distributed in a staggered mode, so that the shielding effect of grounding on the capacitor is effectively reduced, and the sensitivity of the sensor is not affected.

With respect to the above-described aspects, the present application will be described below by way of specific examples.

Example 1

Referring to fig. 1, a layer of quartz wool is used in this example in conjunction with a capacitive sensing wire 100 and a heater wire 200. Wherein, the front surface of the quartz cotton layer is paved with a capacitance induction wire 100, and the back surface of the quartz cotton layer is paved with a heating wire 200, and the heating wire is grounded.

Meanwhile, the capacitive sensing wires 100 are distributed along the front surface of the quartz wool layer in a sine manner; the heating wires 200 are distributed in a sine mode on the reverse side of the quartz cotton layer; the capacitive sensing wire 100 and the heating wire 200 are distributed in a staggered manner in the laying direction, so that the capacitive sensing wire and the heating wire are distributed in a staggered manner.

In practical application, the points a of the heating wires 200 in sinusoidal distribution and the points B of the capacitive sensing wires 100 in sinusoidal distribution are in the same vertical plane, so as to achieve the best decoupling effect. At the same time as this is done,

the amplitude (i.e. the height of C and D in the figure) of the chord-type staggered distribution of the capacitive sensing wire 100 or the heating wire 20 corresponds to the diameter of a steering wheel to be installed, so that the plane C at the highest point of the waveform and the plane D at the lowest point of the waveform can be just contacted when winding.

So set up, make response silk and ground heating wire stagger, through experimental verification, can effectively reach the effect of decoupling, and do not influence the sensitivity of electric capacity collection.

Example 2

Referring to fig. 2, a layer of quartz wool is used in the present example in combination with the capacitive sensing wire and the heating wire. Wherein, lay the electric capacity induction silk on the front of quartz cotton layer, lay the heater strip on the reverse side of quartz cotton layer, this heater strip ground connection.

Meanwhile, the capacitive sensing wires 100 are distributed along the front surface of the quartz wool layer in a matrix manner; the back surfaces of the quartz cotton layers of the heating wires 200 are distributed in a matrix manner; and the capacitive induction wires and the heating wires are distributed in a staggered manner in the laying direction, so that the capacitive induction wires and the heating wires are distributed in a staggered manner.

The specific requirements for the distribution of the same are as in example 1

So set up, make response silk and ground heating wire stagger, through experimental verification, can effectively reach the effect of decoupling, and do not influence the sensitivity of electric capacity collection.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.