DE102013009930A1 - Heating textile, in particular for a motor vehicle - Google Patents

Abstract

The invention relates to a heating textile, in particular for a motor vehicle, with at least one flat knitted fabric (12) in which electrically conductive heating yarns (14, 16) with a respective first electrical resistance and at least one second electrical resistance lower than the first electrical resistance Electrode yarn (18) exhibiting resistance and electrically conductive for making electrical contact with the heating yarns (14, 16) are integrated, the heating yarns (14, 16) each having the electrode yarn (18) per course of the knitted fabric (12) at at least two spaced-apart locations ( 20, 22) make electrical contact.

Description

The invention relates to a heating textile, in particular for a motor vehicle, according to the preamble of patent claim 1.

The heating of interiors of cars, especially passenger cars, is usually done by convection heating. This conditioned air is blown by means of a fan via appropriate air nozzles in the interior. As a heating element for conditioning the air while a heat exchanger is used, by means of which a heat transfer from a cooling medium for cooling a drive unit, such as an internal combustion engine, is effected on the air to be supplied to the interior.

On the way from the heating element through corresponding line elements and the Luftausströmelement through to the interior high heat losses can occur, so that the air cools down again. In addition, it can lose heat on the way from the Luftausströmelement to occupants of the motor vehicle. In addition, the air can only be heated sufficiently if sufficient waste heat is provided by the drive unit. This leads to an only energy-inefficient and uncomfortable heating of the interior. In addition, it takes a relatively long time until a strong warming of the interior can be effected. Since the occupants usually sit relatively far away from the Luftausströmelement, they perceive the warm air and caused by the warm air heating of the interior until very late true.

As an alternative to such a convection heating, it is known to use heating textiles. Such a heating textile comprises a flat knitted fabric in which electrically conductive yarns and at least one electrode yarn for electrically contacting the heating yarns are integrated. The heating yarns are electrically connected to the electrode yarn and can be connected via the electrode yarn with a power source. As a result, the heating yarns are heated in the manner of a resistance heating element. By means of such a heating textile, a so-called surface heating can be represented, by means of which a particularly energy-efficient and rapid heating of the interior of a motor vehicle can be realized. The heating textile can be integrated, for example, in an interior trim part and thus arranged particularly close to the occupants. The occupants thus perceive a particularly caused by the Heiztextil heating particularly quickly. In addition, heat losses can be kept low in comparison to the convection heating. In addition, the heating of the interior is independent of a possibly provided by a drive unit waste heat.

Such a Heiztextil is thus particularly well suited for use in hybrid vehicles or electric vehicles, so that, for example, stored in a battery, electrical energy to a large extent for electrically driving the motor vehicle and only a very small part for heating the interior are used can.

Such a Heiztextil is for example from the DE 201 11 067 U1 known. This discloses a current-conducting knitted fabric containing an electrically conductive, relatively high-resistance, flexible resistance material made of carbon fibers with metal conductors for the electrical leads of a low-resistance material. In this case, the carbon fibers and the metal conductors are acted upon in a made of plastic threads as a carrier material knit to form a unitary part.

Object of the present invention is to provide a Heiztextil which has a particularly high functional performance security.

This object is achieved by a Heiztextil with the features of claim 1. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the remaining claims.

In order to provide a Heiztextil with a particularly high functional performance security, it is provided according to the invention that the heating yarns each electrically contact the electrode yarn per row of knitted fabric at least two spaced apart locations. In other words, at least two locations per stitch course of the knitted fabric are provided, at which the respective heating yarn is electrically connected to the electrode yarn. As a result, a plurality of mutually spaced electrical connection points are provided per course and heating yarn, so that a particularly high contact protection is provided. If, for example, the electrical contact is removed at a first of the locations, an electrical contact is further formed at the second location, so that the corresponding heating yarn can continue to be supplied with electric current and thus used for heating. The electrical contacting at the at least two points can be realized, for example, such that the heating yarns are arranged in such a way that they wrap around the electrode yarn per stitch row several times, that is, at least twice.

In a further embodiment of the invention, at least one floatation of the electrode yarn and / or the Heizgarne is provided. Such a floatation is usually also called floating denotes and allows the representation of a particularly simple contacting of the at least one electrode yarn with a heating textile external power supply or power source. For example, by means of a floatation designed, for example, in the production of the heating textile, it is possible to separate out respective, preconfigured regions of the heating textile in a simple manner from the entire product and to electrically couple the at least one electrode yarn to the external power supply. As a result, it is also possible in a simple and cost-effective manner to produce the Heiztextil component and / or size-specific and, for example, in size and / or shape of an interior trim part, in which the Heiztextil is to be integrated adapt. By incorporating a floating conductor in the form of at least one electrode yarn, a particularly secure electrical contact can be further ensured.

It has proven to be particularly advantageous if at least one second electrode yarn for electrically contacting the heating yarns is integrated into the knitted fabric. In this case, the second electrode yarn also has a lower resistance compared to the respective first electrical resistance, wherein the electrode yarns can have, for example, at least substantially the same electrical resistance. By using a plurality of electrode yarns, a redundant system can be created with respect to the supply of electrical heating to the heating yarns, which protects the heating textile from total failure.

Advantageously, the electrode yarns are completely spaced apart from each other. In other words, the electrode yarns do not touch each other. In this way, the risk of so-called hotspot formation at bonding points of the heating textile can be avoided or at least minimized, since no bonding points of the electrically conductive electrode yarns are provided with each other. "Hotspots" are places where undesirable heat generation occurs. It has also proven to be particularly advantageous if the heating yarns are spaced apart from one another. This means that the heating yarns do not touch. As a result, the risk of hotspot formation at bonding points of the heating textile can be kept low because no binding points of the electrically conductive heating yarns are provided with each other.

Due to the integration of the heating yarns and the electrode yarns in the knitted fabric, it is also possible to produce the heating textile in a so-called one-shot process. In such a one-shot process, the heating textile is produced in only one process step, wherein the heating yarns and the at least one electrode yarn can already be incorporated in the production of the knitted fabric, ie simultaneously with the production of the knitted fabric. Further and additional, subsequent to the production of the knit, process steps for introducing the electrode yarn and the heating yarns in the knitted fabric are thus not provided and not required. As a result, a fully functional heating textile can be produced in only one process step, so that the heating textile can be produced in a particularly timely and cost-effective manner.

In addition, a component or near-net shape production of the heating textile can be realized. In other words, with regard to its geometry, the heating textile can be adapted already during its production to a geometry of a component, in particular of an interior trim part, into which the heating textile is integrated after its production.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawings; these show in:

1 a schematic plan view of a Heiztextil according to a first embodiment, in particular for a passenger car, with a flat knitted, in which electrically conductive heating yarns and electrically conductive electrode yarns for electrically contacting the heating yarns are integrated, wherein the heating yarns in each case the respective electrode yarn per row of knitted fabric electrically contact at least two spaced apart locations;

2 a schematic plan view of the Heiztextil according to a second embodiment; and

3 a detail of a further schematic plan view of the Heiztextil according to the second embodiment.

1 shows a schematic plan view of a Heiztextil 10 for a passenger car. The heating textile 10 has an at least substantially flat or flat textile in the form of a knitted fabric 12 on, which is formed from fibers or threads. Into the knitwear 12 electrically conductive heating yarns are integrated, of which in 1 two electrically conductive heating yarns 14 . 16 are shown. The electrically conductive heating yarns 14 . 16 are formed high impedance and have a respective first electrical resistance.

Into the knitwear 12 are also electrically conductive electrode yarns 18 integrated, which for electrically contacting the heating yarns 14 . 16 serve. With other words are the heating yarns 14 . 16 with the electrode yarns 18 electrically connected so that the heating yarns 14 . 16 over the electrode yarns 18 with one from the heating textile 10 electrical power supply of the motor vehicle can be coupled. This makes it possible, by means of the electric power source to the heating yarns 14 . 16 over the electrode yarns 18 to apply an electrical voltage and current through the heating yarns 14 . 16 passing through, thereby heating the Heizgarne 14 . 16 is effected.

The electrode yarns 18 are compared to the heating yarns 14 . 16 formed low impedance and have a respective, second electrical resistance, which is less than the first electrical resistance. The electrode yarns 18 are for example made of a metallic material, in particular copper. The heating yarns 14 . 16 are made of stainless steel or carbon or carbon.

To illustrate a particularly process-reliable, electrical contact between the respective electrode yarns 18 and the respective heating yarns 14 . 16 it is intended that the heating yarns 14 . 16 in each case the respective electrode yarn 18 per course of the knitted fabric 12 at least two spaced apart locations 20 . 22 Contact as it is in 1 the example of the heating yarn 14 is illustrated. For this purpose, for example, a supply and return of the heating yarns 14 . 16 provided, which can be realized, for example by Wirkverfahren.

To realize the electrical contact at the two spaced locations 20 . 22 For example, it is envisaged that the electrically conductive heating yarns 14 . 16 the respective electrode yarn 18 per course of the knitted fabric 12 several times, that is to say at least twice. As a result, a particularly high contact security is created. If, for example, the failure of the electrical contacting occurs at a first of the points 20 . 22 , so the electrical contact can continue at the second of the bodies 20 . 22 be guaranteed. Thus, the heating textile has 10 a very high performance satisfaction on.

In 1 Two different binding structures of the heating yarns are illustrated. Based on the image levels of 1 left heating thread 14 illustrates such a bond structure which is the "body jersey open" weave. In contrast, the right-hand heating thread points 16 a substantially sinusoidal course.

By using the several electrode yarns 18 is created in terms of power supply redundant system, so that the Heiztextil 10 or the heating yarns 14 . 16 also in case of damage or failure of one of the electrode yarns acting as an electrode 18 can be powered. The probability of causing a complete failure of the heating textile 10 in terms of its heating ability, is thus particularly low.

Out 1 is also a respective, so-called rapport 21 as well as regarding the electrode yarns 18 a so-called float 23 of the heating textile 10 recognizable.

2 shows the heating textile 10 according to a second embodiment, wherein in 2 by a directional arrow 26 the production direction of the heating textile 10 or the knitwear 12 is illustrated. Also the heating textile 10 according to the second embodiment has respective reports 21 as well as floats 23 of the electrode yarns 18 on. In the place of the respective floatation 23 is the respective electrode yarn 18 not in the knitwear 12 involved. When separating individual heating textiles 10 from a whole with 24 designated overall goods can on the one hand by a sufficient float length of the electrode yarns 18 ensures a good contact and on the other hand by a suitable size adjustment of the heating textile to be produced 10 manufactured component and size-matched heating textiles.

How out 3 is recognizable, it is in the Heiztextil 10 further provided that the electrode yarns 18 are spaced apart and do not touch. Also the heating yarns 16 are spaced apart from each other and do not touch. This may increase the risk of overheating of the heating textile 10 be kept particularly low.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 20111067 U1 [0006]

Claims (6)

Heating textile, in particular for a motor vehicle, with at least one flat knitted fabric ( 12 ) into which electrically conductive heating yarns ( 14 . 16 ) having a respective first electrical resistance and at least one lower electrical resistance to the first electrical resistance, the second electrical resistance exhibiting and electrically conductive electrode ( 18 ) for electrically contacting the heating yarns ( 14 . 16 ), characterized in that the heating yarns ( 14 . 16 ) each of the electrode yarn ( 18 ) per course of the knitted fabric ( 12 ) at at least two spaced apart locations ( 20 . 22 ) contact electrically. Heating textile according to claim 1, characterized in that for electrically contacting the heating yarns ( 14 . 16 ) the electrode yarn ( 18 ) at least twice. Heating textile according to one of claims 1 or 2, characterized in that at least one floatation ( 23 ) of the electrode yarn ( 18 ) is provided. Heating textile according to one of the preceding claims, characterized in that at least one second electrode yarn ( 18 ) for electrically contacting the heating yarns ( 14 . 16 ) into the knitwear ( 12 ), the electrode yarns ( 18 ) are spaced from each other. Heating textile according to one of the preceding claims, characterized in that the heating yarns ( 14 . 16 ) are formed of carbon or stainless steel. Heating textile according to one of the preceding claims, characterized in that the at least one electrode yarn ( 18 ) is formed of copper.

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