Electrical Heating Device, Method for the Production Thereof, and Vehicle Seat With Such a Heating Device

Patent metadata

Field	Value
Publication number	US-2016309544-A1
Application number	US-201615098373-A
Country	US
Kind code	A1
Filing date	Apr 14, 2016
Priority date	Apr 17, 2015
Publication date	Oct 20, 2016
Grant date	—

Abstract

An electrical heating device includes at least one support; at least one ohmic heating resistor; and at least one temperature sensor. The heating resistor includes a heating conductor strand, which is laid out on, or in, the support in a track-like, curving, or meandering pattern to span a heating field. The heating conductor strand includes a measurement loop formed by at least two heating conductor sections that are separated from one another, and, in each case, are connected together electrically conductively at one end, and which are laid out around the temperature sensor and form a delimited measurement field. The temperature sensor is placed in a measurement position within the measurement field spanned by the measurement loop so that it is positioned as a function of a surface area formed by the measurement field at a greater or smaller distance from an opening of the measurement loop.

First claim

We claim:

1 . An electrical heating device comprising:
a. at least one support; b. at least one ohmic heating resistor; and c. at least one temperature sensor; wherein the heating resistor comprises at least one heating conductor strand, the at least one heating conductor strand is kid out on, or in, the at least one support in a track-like, curving, or meandering pattern in order to span a heating field, wherein the at least one heating conductor strand comprises at least one measurement loop, which is formed by at least two heating conductor sections that are separated from one another and in each case connected together electrically conductively at one end, and which are laid out around the at least one temperature sensor and thereby form a delimited measurement Held, wherein the at least one temperature sensor is placed in a measurement position within the measurement Held spanned by the measurement loop in such a way that the at least one temperature sensor: i. has approximately the same distance from the adjacent heating conductor sections of the measurement loop, and ii. as a function of a surface area formed by the measurement field, the at least one temperature sensor is positioned at a larger or smaller distance from an opening of the measurement loop.

2 . The electrical heating device according to claim 1 , wherein the measurement field spans the surface area having a defined magnitude, and
wherein depending on the magnitude of the surface area of the measurement field, a certain position in the area of the measurement field is associated with the temperature sensor.

3 . The electrical heating device according to claim 1 , wherein the temperature sensor is arranged approximately equidistantly from the heating conductor strands on both sides, and
wherein in each case, a distance from a section connecting the heating conductor strands or from an opening formed between the heating conductor strands is variable as a function of the surface area of the measurement field.

4 . The electrical heating device according to claim 1 , wherein the heating conductor strands that form the measurement field are oriented at least approximately parallel to one another or parallel to one another in at least some sections.

5 . The electrical heating device according to claim 1 , wherein the heating conductor strands that form the measurement field in each case are arranged in a shape of an arc with concave arc sides facing one another, form an oval that is open on one side, or form a circular segment.

6 . The electrical heating device according to claim 1 , wherein at least sections of the heating conductor strands that form the measurement field are arranged at a distance between 4 and 10 mm, in particular at a distance between 6 and 8 mm, from one another.

7 . The electrical heating device according to claim 1 , wherein the temperature sensor is formed as an NTC sensor which is narrowly localized spatially.

8 . The electrical heating device according to claim 1 , wherein the at least one heating conductor strand and/or the temperature sensor is/are sewn into the at least one support.

9 . The electrical heating device according to claim 1 , wherein the temperature sensors are attached in two or more positions within the electrical heating device,

10 . The electrical heating device according to according to claim 1 , wherein a correlation between the temperature measurement value delivered by the temperature sensor and an actual temperature averaged over the surface area of the heating field corresponds to an optimum within the measurement field that is matched to an individual heating device.

11 . A heatable vehicle seat having a seat pad and/or a backrest pad, wherein at least the seat pad and/or the backrest pad is/are provided with the electrical heating device according to claim 1 which forms a seat heater of the vehicle seat.

12 . A method for the production of the electronic heating device according to claim 1 comprising:
arranging the at least one heating conductor strand in a curving or meandering pattern in at least some sections; and
acquiring the magnitude of a distance and/or a surface area between two directly adjacent heating conductor strands that form the measurement field; and
fixing the temperature sensor in a defined position within the measurement field as a function of the acquired magnitude.

13 . The method according to claim 12 , wherein the method includes a step of acquiring by means of a camera system an exact pattern of the heating conductor strands forming the heating conductor loop.

14 . The method according to claim 12 wherein a target position of the temperature sensor within the measurement field is indicated by means of a light spot, in particular, by means of a laser pointer, which gives a manual, partially automatic or automatic positioning of the temperature sensor within the heating device.

15 . An electrical heating device comprising:
a. at least one support; b. at least one ohmic heating resistor; and c. at least one temperature sensor; wherein the heating resistor comprises at least one heating conductor strand, the at least one heating conductor strand is laid out on or in the at least one support in a track-like, curving or meandering pattern in order to span a heating field, wherein the at least one heating conductor strand comprises at least one measurement loop, which is formed by at least two heating conductor sections that are separated from one another and in each case connected together electrically conductively at one end, and which are laid out around the at least one temperature sensor and thereby form a delimited measurement field, wherein the at least one temperature sensor is placed in a measurement position within the measurement field spanned by the measurement loop in such a way that the at least one temperature sensor: i. has approximately the same distances from the adjacent heating conductor sections of the measurement loop, and, ii. as a function of a surface area formed by the measurement field, the at least one temperature sensor is positioned at a larger or smaller distance from an opening of the measurement loop. wherein the temperature sensor is arranged approximately equidistantly from the heating conductor strands on both sides, wherein a distance from the section connecting the heating conductor strands or from an opening formed between the heating conductor strands is variable as a function of the surface area of the measurement field, wherein the heating conductor strands that form the measurement field are oriented at least approximately parallel to one another or parallel to one another in at least some sections, wherein sections of the heating conductor strands that form the measurement field are arranged at a distance between 6 mm and 8 mm from one another, wherein the at least one heating conductor strand and/or the temperature sensor is/are sewn into the at least one support, and wherein a correlation between the temperature measurement value delivered by the temperature sensor and an actual temperature averaged over the surface area of the heating field corresponds to an optimum within the measurement field that is matched to the individual heating device.

Assignees

• Gentherm Gmbh

Inventors

• Vörös Gábor

Classifications

• H05B1/0238 Primary

  For seats · CPC title

• H05B2203/003

  using serpentine layout · CPC title

• H05B3/34

  flexible, e.g. heating nets or webs · CPC title

• H05B3/02

  Details · CPC title

• B60N2/5678 Primary

  characterised by electrical systems · CPC title