CN214565601U

CN214565601U - Heater with human body approaching detection function

Info

Publication number: CN214565601U
Application number: CN202120055136.8U
Authority: CN
Inventors: 孙滕谌; 曾凡佑; 庄玮
Original assignee: Beijing Tashan Technology Co ltd
Current assignee: Beijing Tashan Technology Co ltd
Priority date: 2021-01-09
Filing date: 2021-01-09
Publication date: 2021-11-02
Anticipated expiration: 2031-01-09

Abstract

A heater with a function of detecting the approach of a human body for a steering wheel or a seat connected to a power source of a car, comprising: the device comprises a power supply, an electric heating module, a capacitance digital conversion circuit and a control module; the electric heating module is composed of a resistor body which is heated by electric energy, and the resistor body is connected with a power supply through a switch; in the steering wheel or the seat, two signal wires are arranged along with the resistor body, the signal wires are connected with the digital conversion circuit, and the capacitance digital signal conversion circuit outputs a logic signal for detecting the approach of a human body to the steering wheel or the seat through the control module.

Description

Heater with human body approaching detection function

Technical Field

The utility model relates to a join in marriage steering wheel heater device and the seat heating device who steers the steering wheel, especially still possess the human body and be close the detection function.

Background

Nowadays, steering wheels and car seats with heating function have become the basic equipment in cars. Steering wheel and seat heating technologies also tend to mature. The company filed' patent No. 202020367413.4 in 2020, which contains a number of references to describe the state of the art and the modifications proposed by the company.

In practice, it is found that electronic switches used for controlling electric energy supplied to a steering wheel or a seat by each automobile manufacturer are electronic devices made of various PN junctions generally, particularly, under the requirement of electric heating, the contact area of the PN junctions of the electronic switches is large, the capacitance of the resulting junction can reach more than 1000PF, even 5000PF, and the parameters of the electronic switches of each manufacturer are largely different, so that in many cases of the above patent products, some sensitivity calibration work needs to be performed for the configuration of a client, and the product is difficult to achieve universality;

on the other hand, in the technical solution of the patent, a relatively high signal frequency is necessary, otherwise it is difficult to detect the signal after the approach of the human body, and the detection of the high frequency signal corresponds to the cost of the detection chip on the one hand, and on the other hand, the electromagnetic interference and radiation of the high frequency signal in the environment are also problems to be managed to face.

With the continuous development of automobile intellectualization, the detection of approaching to a human body can not only complete the control of electric heating, but also provide additional logic information for the intellectualization of the whole automobile, under the condition, the detection becomes the standard allocation of the automobile more and more, therefore, the development of a product with controllable cost and strong universality becomes the problem that the company needs to be continuously corrected on the basis of the original technology.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a heater that is applicable to steering wheel or seat detection human body and is close to be applicable to various motorcycle types and low cost, dependable performance, simple structure, simple to operate.

The utility model discloses a heater with detect human function of being close, it is used for steering wheel or seat continuous with car power, include: the device comprises a power supply, an electric heating module, a capacitance digital conversion circuit and a control module; the electric heating module is composed of a resistor body which generates heat through electric energy, the resistor body is connected with the power supply through a switch, and the resistor body is installed in a steering wheel or a seat; the resistor body is accompanied by two signal wires arranged in a steering wheel or a seat, a capacitance digital signal conversion circuit is connected between the two signal wires, and the capacitance digital signal conversion circuit comprises a capacitance excitation signal circuit; the capacitance digital signal conversion circuit is connected with the control module, and the control module outputs a logic signal for detecting the approach of a human body to the steering wheel or the seat. The two signal wires are accompanied by that for the area where the electric heating resistor body is installed, the signal wires are basically arranged to be close to the human body capable of sensing the area; the signal line is connected with the capacitance exciting and detecting circuit only and is electrically insulated with the resistor body. The signal line only reflects the change condition of the capacitance signal of the area where the resistor body is located when the human body approaches; the signal wire can accompany the resistor body in various ways, and the signal wire and the resistor body can be wound into a stranded wire for the convenience of production; the signal wire and the resistor body can adopt resistance wires with the same specification, so that the specification and variety of raw material preparation are reduced.

The utility model discloses in, adopt present more ripe electric capacity digital conversion circuit (CDC), it contains electric capacity excitation signal circuit, and wherein electric capacity excitation signal circuit selects to produce the high frequency square wave excitation signal that is greater than 10KHz, verifies through the experiment, and comprehensive factors such as the performance of CDC chip on the existing market, price and supply condition, the signal of loading 80K-1MHz not only makes circuit detection resolution ratio higher, and the chip price/performance ratio is more suitable, and the supply does not have the problem yet moreover.

The electrothermal resistor bodies of the steering wheel or the seat of the automobile are generally arranged in a subarea mode, for example, the left area and the right area of the steering wheel, even the front surface and the back surface are separated, and a plurality of areas can be arranged on the seat, including the area in the seat back, the subarea setting is obvious in advantage, for example, when signal lines are respectively arranged on the inner side and the outer side of the steering wheel, the approach of a driver with a belly and the steering wheel with a hand can be distinguished, and similarly, the holding state monitoring of the hand on the steering wheel and the sitting posture monitoring brought by the position state of the back of the hip part, the seat body and the seat back body after the driver sits on the steering wheel provide more judgment conditions for a warning system or an intelligent control air bag system in the automobile. In general, the resistive element is a resistance wire which is arranged in a meandering manner in the region of the steering wheel and/or the seat. The adopted resistor body can be selected in various ways, and comprises a metal electric heating wire, a metal silk-screen circuit or carbon fiber.

Compared with the prior art, the utility model discloses a heater's simple structure, the commonality is strong, and is not high to the requirement of detecting chip, and low cost has reduced high frequency signal's interference and radiation phenomenon.

Drawings

FIG. 1-1 is a front view of the present heater disposed on a steering wheel;

FIGS. 1-2 are side views of the present heater disposed on a steering wheel;

FIGS. 1-3 are rear views of the present heater disposed on a steering wheel;

FIG. 2 is a schematic view of the present heater disposed in a vehicle seat;

FIG. 3 is a schematic diagram of the heater with 2 accompanied signal lines in the middle of the resistor;

FIG. 4 is a schematic diagram of the heater with 2 signal lines outside the resistor;

FIG. 5 is a schematic diagram of the heater with 2 signal lines, one line in the middle of the resistor body and the other line outside the resistor body;

fig. 6 is a schematic view showing the arrangement of the resistor body and the signal line on different layers in the present heater;

FIG. 7 is a schematic illustration of a plurality of zones on a steering wheel;

FIG. 8 is a perspective view of the wrapping of multiple zones on a steering wheel;

fig. 9 is an equivalent circuit diagram of 2 signal lines and resistors for heating in the present heater.

Detailed Description

Fig. 1-1, 1-2, and 1-3 show a schematic view of the structure of a steering wheel. Wherein the upper surface D-1 of the steering wheel is divided into two areas A and B, and the lower surface D-2 is divided into a subarea C. Wherein an electric heating module in a heater having a function of detecting the approach of a human body is provided on a steering wheel. The electric heating module is composed of a resistor body which generates heat by electric energy.

Referring to fig. 9, the utility model discloses a heater with detect human body and be close function, it is used for steering wheel or seat that links to each other with car power, include: the device comprises a power supply 3, an electric heating module, a capacitance digital conversion circuit 4 and a control module; the electric heating module is composed of a resistor body 1 which generates heat through electric energy, the equivalent resistance of the electric heating module is R1, the resistor body 1 is connected with the power supply 3 through a switch, a control module and the switch are not shown in the figure, and the resistor body 1 is installed in a steering wheel or a seat according to the requirement; the resistor body is accompanied by two signal wires 2-1 and 2-2 which are arranged in a steering wheel or a seat, a capacitance digital signal conversion circuit (CDC)4 is connected between the two signal wires, and the capacitance digital conversion circuit 4 comprises a capacitance excitation signal circuit 4-2 and an analog-digital conversion circuit 4-1; the capacitance digital signal conversion circuit 4 is connected to a control module, and the control module outputs a logic signal for detecting the proximity of a human body to a steering wheel or a seat, for example, when it is determined that a human body is present on the seat, the control module turns on a switch for supplying power to an electrothermal resistor of the seat.

Fig. 3 shows a resistor 1, a signal line 2-1, and a signal line 2-2. The resistor body 1, the signal wire 2-1 and the signal wire 2-2 can adopt materials with the same specification or different specifications, wherein the resistor body comprises the following various schemes: and the metal electric heating wires, the metal silk-screen circuit or the carbon fibers are arranged on the steering wheel in a roundabout manner.

Preferably, the steering wheel or the seat is divided and arranged into three areas A, B and C. Each area is respectively provided with a heater resistor body 1 with a function of detecting human body approaching, so that a part for centralized heating can be determined according to the position of a human hand on a steering wheel, and the signal line 2-1 and the signal line 2-2 form mutual capacitance to detect and judge the holding relationship between the hand and the steering wheel, including holding, putting on or even leaving the hand.

Fig. 4 and 5 are schematic diagrams illustrating different arrangements of 2 signal lines associated with the resistor body and the resistor body. Fig. 4 is a schematic diagram of the heater in which 2 accompanied signal lines are located outside the resistor body. Fig. 5 is a schematic diagram showing that 2 signal lines are arranged in the middle of the resistor body, and the other signal line is arranged outside the resistor body. Similarly, 2 accompanying signal lines may be located on a different layer from the heating resistor, and as shown in fig. 6, an accompanying signal line 2-1 is located on a different layer from the heating resistor, and an accompanying signal line 2-2 is located on the same layer as the heating resistor. Of course, the accompanying signal lines 2-1 and 2-2 and the heating resistor body may be located in different layers. When the 2 accompanying signal wires and the heating resistor body are positioned on different layers, the same arrangement mode as the resistor body or different lengths can be adopted; for example, taking the example that the heating body is arranged on the back of the full circle steering wheel in the C area, assuming that the total length of the wavy resistor body is 5 meters, and further assuming that the perimeter of the C area of the steering wheel is 0.5 meter, the length of the two accompanying signal wires can be selected to be 5 meters or half of the length of the signal wires is 2.5 meters, or only 0.5 meter is arranged in the C area, and various configurations are given in fig. 4-6, and various combinations can be performed. The heating body can be divided into a plurality of subareas so as to better identify the position of a hand on the steering wheel, and meanwhile, the holding posture of the hand on the steering wheel can be judged in an auxiliary way through the change of capacitance values in different areas, and for a seat, the holding posture is the sitting posture of a person; the technical proposal of the steering wheel is also completely applicable to the seat. In practice, individual customers also propose a requirement for recognizing that other parts of the human body besides hands, for example, the belly of a driver with a big belly, are in contact with the steering wheel, for this purpose, a partition structure as shown in fig. 7 and fig. 8 can be adopted, the heater is integrally divided into A, B, C, D and 4 partitions, when the heater is coated on the steering wheel, the partition D is positioned on the inner circle of the steering wheel, the partition A, B is positioned on the upper surface of the steering wheel, and the partition C is positioned on the lower surface of the steering wheel. If the human belly touches the steering wheel, the mutual capacitance on the partition D can not be touched, and whether the hand or the belly touches the steering wheel is judged through the mutual capacitance change of the four partitions A, B, C and D.

Referring to fig. 9, in the present heater, a power supply 3 is connected to a resistor 1. The resistor body 1 converts electric energy in the power source 3 into heat energy to heat the steering wheel and/or the seat. An analog-to-digital conversion circuit 4-1 is connected to the signal line 2-1, and a capacitance excitation signal circuit (generally referred to as a CDC circuit 4) is connected to the signal line 2-2 to form mutual capacitance. When a hand of a human body approaches the steering wheel, coupling between the signal line 2-1 and the signal line 2-2 is affected, thereby changing a change in capacitance between the signal line 2-1 and the signal line 2-2.

Because steering wheel skeleton and seat, basic component material are metal, set up two signal lines that accompany, utilize mutual capacitance to detect can effectually avoid the influence that the ground connection state that a large amount of metal materials of steering wheel, seat itself brought produced measurement sensitivity, can improve the interference killing feature of this product, the suitability is better. Fig. 2 shows a structure in which the present heater is mounted on a seat. Similarly, the seat may be divided into a plurality of regions, and each of the regions may be provided with a heater having a function of detecting the approach of the human body. The detection mode of the heater arranged on the seat is the same as that of the heater arranged on the steering wheel, so the description is omitted.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A heater with a function of detecting the approach of a human body for a steering wheel or a seat connected to a power source of a car, comprising: the device comprises a power supply, an electric heating module, a capacitance digital conversion circuit and a control module; the electric heating module is composed of a resistor body which generates heat through electric energy, the resistor body is connected with the power supply through a switch, and the resistor body is installed in a steering wheel or a seat; the resistance body is accompanied by two signal wires installed in a steering wheel or a seat, a capacitance digital signal conversion circuit is connected between the two signal wires, and the capacitance digital signal conversion circuit comprises a capacitance excitation signal circuit; the capacitance digital signal conversion circuit is connected with the control module, and the control module outputs a logic signal for detecting the approach of a human body to the steering wheel or the seat.

2. The heater as claimed in claim 1, wherein the resistive body comprises a metal electric heating wire, a metal screen circuit, or a carbon fiber.

3. The heater of claim 1, wherein the resistive body segments are positioned on the steering wheel with at least one resistive body per segment.

4. The heater of claim 3, wherein the resistor body is divided into two regions of a front surface mounting, a whole region of a rear surface mounting, and a region of an inner side mounting on the steering wheel.

5. The heater of claim 1, wherein said resistive body segments are disposed on the seat and/or back, at least one resistive body per segment.

6. A heater as claimed in claim 3 or 4 or 5, wherein the resistive body is a meander arranged resistance wire.