Device for determining the temperature of a resistance heating device

Abstract

The invention relates to a device (10) for determining the temperature of a resistance heating device (102), comprising: a temperature sensor (12) which is configured to sensory detect the temperature of the resistance heating device (102); and an electronic data processing and / or control device (14) which is configured to calculate a temperature change of the resistance heating device (102) based on a change in the resistance value of the resistance heating device (102) and a relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) and to verify the temperature of the resistance heating device (102) sensory detected by the temperature sensor (12) taking into account the calculated temperature change of the resistance heating device (102).

Description

Technical Field

[0001] The invention relates to a device for determining the temperature of a resistance heating device, comprising a temperature sensor which is provided for sensing the temperature of the resistance heating device.

[0002] Furthermore, the invention relates to a heating system, in particular for use in a vehicle, having a resistance heater and a device for determining the temperature of the resistance heater.

[0003] Furthermore, the invention relates to a method for operating a heating system, comprising the following steps: the temperature of a resistance heater of the heating system is detected by means of a temperature sensor of the heating system. Background Art

[0004] In modern vehicles, resistance heaters having one or more heating wires are used in many different applications in order to achieve temperature control of objects or areas. In particular, corresponding resistance heaters are used in heated vehicle seats.

[0005] For monitoring and / or regulating the corresponding resistance heating device, a sensory temperature detection is performed on the resistance heating device, thereby ensuring a high degree of operational reliability and enabling a comfort-enhancing control operation. For detecting the temperature of the resistance heating device, NTC resistors are used as temperature sensors in the prior art, for example.

[0006] In order to increase the operational reliability of the corresponding resistance heating device, it is usually necessary to check or verify the temperature measurement values ​​detected by the temperature sensor in order to detect possible functional failures of the temperature sensor. A faulty temperature sensor provides a control or regulation system with faulty temperature measurement values, which can lead to a temperature propagation to the resistance heating device that is not expected by the user. This can lead to excessive heating of the contact surface, which results in a significant risk of injury to the user. A faulty temperature sensor can thus, for example, lead to burns to the user.

[0007] In order to check or verify the temperature measured value of the temperature sensor, an additional temperature sensor or temperature data of an external system is required. However, the additional temperature sensor leads to increased production costs and increased system complexity. The temperature data of the external system cannot be provided in many application cases.

[0008] The use of the current resistance value of a resistance heating device has not been considered in the past for accurately determining the temperature of the resistance heating device. In addition to the temperature, the resistance of a resistance heating device is also affected by other influencing factors, such as damage, wear or manufacturing tolerances. Due to these influencing factors, reliable temperature detection via the resistance value of a resistance heating device has not been possible in the past. Summary of the invention

[0009] The object of the present invention is therefore to make it possible to check or validate a temperature measurement value acquired by sensory means, without requiring an additional temperature sensor or temperature data from an external system.

[0010] This object is achieved by a device of the type mentioned in the introduction, wherein the device according to the invention has an electronic data processing and / or control device, which is designed to calculate a temperature change of the resistance heating device based on a change in the resistance value of the resistance heating device and the relationship between the resistance and the temperature of the resistance heating device, and to verify the temperature of the resistance heating device sensed by a temperature sensor by taking into account the calculated temperature change of the resistance heating device.

[0011] The invention makes use of the knowledge that by calculating the temperature change of the resistance heating device based on the change in the resistance value of the resistance heating device, it is possible to reliably check whether the temperature sensor is operating as expected and without errors. By means of the calculation-based verification, it is thus possible to determine functional disturbances or damage to the temperature sensor without the need for an additional temperature sensor. By means of this verification, the reliability of the temperature detection is significantly increased without increasing the manufacturing costs and the number of components. A reliable and cost-effective plausibility test of the temperature values ​​measured by the temperature sensor can be achieved.

[0012] The relationship between the resistance and the temperature of the resistance heating device can be, for example, a resistance temperature characteristic curve. The electronic data processing and / or control device can be a microcontroller or include a microcontroller. The temperature sensor is preferably configured to be arranged and preferably fixed on the resistance heating device or in the vicinity of the resistance heating device. The resistance heating device can be designed as a heating system and include one or more heating conductors. The one or more heating conductors can be designed as heating wires.

[0013] In a preferred embodiment of the device according to the invention, the electronic data processing and / or control device is configured to compare the sensory detected temperature change of the resistance heating device with the calculated temperature change of the resistance heating device in order to verify the sensory detected temperature of the resistance heating device. The sensory detected temperature change and / or the calculated temperature change of the resistance heating device preferably relates to a verification time period. The temperature change is preferably a temperature increase during the operation of the resistance heating device. Alternatively, the temperature change can also be a temperature drop during the operation of the resistance heating device. By comparing the sensory detected temperature change with the calculated temperature change, most possible functional errors can be detected. Detectable functional errors include, for example, short circuits, open circuits and negative effects on the thermal coupling of the temperature sensor to the resistance heating device. The thermal coupling of the temperature sensor to the resistance heating device can be negatively affected, for example, by the temperature sensor being undesirably released from the resistance heating device or by external heat input, for example, by an external fluid flow. In addition, changes in the measuring characteristics of the temperature sensor and / or leakage currents caused by partial or direct short circuits with external circuits can be detected. In addition, short circuits or open circuits for switching the upper circuit can be detected. By comparing the sensor-detected temperature change with the calculated temperature change, in particular dynamic or changing measurement errors of the temperature sensor can be detected.

[0014] In a further development of the device according to the invention, the relationship between the resistance and the temperature of the resistance heating device used by the electronic data processing and / or control device is a device-specific relationship between the resistance and the temperature of the resistance heating device that is determined specifically for the resistance heating device. The device-specific relationship between the resistance and the temperature of the resistance heating device can be determined during a previous heating process or can be predetermined by the manufacturer.

[0015] In a further embodiment of the device according to the invention, the electronic data processing and / or control device is provided for determining and / or initially storing the relationship between the resistance and the temperature of the resistance heating device used for calculating the temperature, in particular within the framework of the device program. Preferably, the electronic data processing and / or control device has a memory on which the relationship between the resistance and the temperature of the respective resistance heating device is stored or can be stored. By determining the relationship between the resistance and the temperature of the resistance heating device within the framework of the device program, the relationship is a relationship specifically matched to the resistance heating device. Thus, in the relationship between the resistance and the temperature of the resistance heating device, manufacturing tolerances when manufacturing the resistance heating device can be taken into account. Thus, the necessity of using a relatively inaccurate, non-specific overall relationship between the resistance and the temperature of the resistance heating device is eliminated. The electronic data processing and / or control device thus allows extremely accurate calculation of the temperature change of the resistance heating device.

[0016] Furthermore, the following device according to the invention is advantageous, in which the electronic data processing and / or control device is provided for subsequently changing, in particular updating, the relationship between the resistance and the temperature of the resistance heating device used for calculating the temperature. By subsequently changing or updating the relationship between the resistance and the temperature of the resistance heating device, a recalibration or recalibration of the calculation program is achieved. By comparing the sensory temperature change with the calculated temperature change, a constant measurement deviation on the temperature sensor, such as an internal constant negative or positive temperature offset, cannot be detected. However, the constant temperature offset is detected within the framework of updating the relationship between the resistance and the temperature of the resistance heating device. Preferably, the electronic data processing and / or control device is provided for automatically changing or updating the relationship between the resistance and the temperature of the resistance heating device at regular or irregular time intervals.

[0017] In a further embodiment of the device according to the invention, the electronic data processing and / or control device is configured to derive the relationship between the resistance and the temperature of the resistance heating device from at least two value pairs, wherein the first value pair assigns a first temperature value of the resistance heating device to a corresponding first resistance value of the resistance heating device, and the second value pair assigns a second temperature value of the resistance heating device to a corresponding second resistance value of the resistance heating device. From the at least two value pairs, for example, a linear relationship between the resistance and the temperature of the resistance heating device can be derived. In particular, a resistance-temperature characteristic curve can be derived from the two value pairs, which defines the relationship between the resistance and the temperature of the resistance heating device. The relationship between the resistance and the temperature of the resistance heating device can also be represented by a temperature coefficient of the resistance. The first temperature value and / or the second temperature value of the resistance heating device can be detected by means of a temperature sensor. The first resistance value and / or the second resistance value of the resistance heating device can be detected by means of a measuring device, in particular a measuring circuit, of the device.

[0018] In a further preferred embodiment of the device according to the invention, the device is arranged to determine the first value pair and / or the second value pair by itself. Preferably, the temperature of the resistance heating device is kept constant for a stabilization duration before determining the value pair until the temperature value and the resistance value have stabilized. The first temperature value or the second temperature value can be a set temperature setpoint value of the resistance heating device. The temperature setpoint value is maintained for a long period of time, so that the corresponding temperature value and / or resistance value can be stabilized. The first temperature value or the second temperature value can be the following temperature value of the resistance heating device, which occurs when the device is not in operation. This temperature value then basically corresponds to the ambient temperature. In this case, it should be noted that the entire resistance heating device is uniformly cooled to the ambient temperature. The determination of the first value pair and / or the second value pair can be carried out, for example, within the framework of the device program, especially at the manufacturer, preferably when the relationship between the resistance and the temperature of the resistance heating device is initially stored. The determination of the first value pair and / or the second value pair can be carried out, for example, during the normal operation of the device, especially when the relationship between the resistance and the temperature of the resistance heating device is subsequently changed or updated.

[0019] Furthermore, an apparatus according to the invention is advantageous in which an initial relationship between the resistance and the temperature of the resistance heating device is stored in a memory of the electronic data processing and / or control device, wherein the electronic data processing and / or control device is configured to check and / or adjust the stored initial relationship between the resistance and the temperature of the resistance heating device specifically for the resistance heating device during startup. The initial relationship between the resistance and the temperature of the resistance heating device stored at the factory is thus checked with respect to the validity of the initial relationship for a specific apparatus during its first startup.

[0020] In a further preferred embodiment of the device according to the invention, the electronic data processing and / or control device is configured to determine an initial relationship between the resistance and the temperature of the resistance heating device from a first initial value pair stored in a memory and a calculated second initial value pair before or during operation of the device and store the initial relationship in the memory, the first initial value pair assigning a first temperature value of the resistance heating device a corresponding first resistance value of the resistance heating device, and the second initial value pair assigning a second temperature value of the resistance heating device a corresponding second resistance value of the resistance heating device.

[0021] The first initial value pair is preferably determined by the device itself at the end of the manufacturing process and stored in a memory to be used when starting operation. The temperature value of the first initial value pair preferably relates to the ambient temperature of the device at the end of the manufacturing process, i.e., for example, the factory temperature of the manufacturing plant. The second initial value pair is preferably calculated by an electronic data processing and / or control device based on the known characteristics of an intact resistance heating device with respect to the rated temperature. This can ensure not only a quick test when manufacturing the device but also reliable operation from the first use of the device. When the device is used for the first time, the resistance value of the resistance heating device is also detected before the heating mode is activated in order to check whether the resistance heating device has the same characteristics as when it was manufactured and whether it is damaged.

[0022] In a further embodiment of the device according to the invention, the electronic data processing and / or control device is configured to compare during operation at least one value pair of the relationship between the resistance and the temperature of the resistance heating device with a value pair determined by the device during operation of the device. In this way, a slow or gradual deviation in the temperature detected by the temperature sensor can be determined. If the comparison of the deviations shows that the deviation exceeds the tolerance range, this indicates an increased measurement deviation at the temperature sensor or a defect in the resistance heating device.

[0023] The device according to the invention is further advantageously improved by a measuring circuit, which is arranged to detect the current resistance value of the resistance heating device. The measuring circuit preferably comprises a high-side switch, which is arranged to switch the positive supply voltage. That is, the switching is performed when the load is exceeded in this case. The measuring circuit preferably comprises a low-side switch, which is arranged to switch the negative supply voltage. That is, the switching is performed when the load is below in this case. The measuring circuit particularly comprises a resistor and a field effect transistor, which generates a superimposed voltage or a superimposed current. In addition, the measuring circuit can have a voltage divider for protecting the electronic data processing and / or control device.

[0024] Furthermore, the object of the invention is achieved by a heating system of the type mentioned at the outset, wherein the device for determining the temperature of a resistance heating device is designed according to one of the above-described embodiments. With regard to the advantages and variants of the heating system according to the invention, reference is first made to the advantages and variants of the device according to the invention for detecting the temperature of a resistance heating device.

[0025] The heating system can be used, for example, in a heatable vehicle seat for heating a hip contact surface and / or for heating a back contact surface of a vehicle seat.

[0026] In a preferred embodiment of the heating system according to the invention, the resistance heating device is designed as a heating system and comprises one or more heating conductors. The one or more heating conductors can be designed as heating wires.

[0027] The object of the invention is also achieved by a method of the type mentioned at the outset, wherein the method according to the invention comprises calculating a temperature change of the resistance heating device by means of an electronic data processing and / or control device of the heating system based on a change in the resistance value of the resistance heating device and the relationship between the resistance and the temperature of the resistance heating device. The method according to the invention also comprises verifying the temperature of the resistance heating device detected by the temperature sensor by taking into account the calculated temperature change of the resistance heating device.

[0028] A heating system according to one of the above-described embodiments is preferably operated with the aid of the method according to the invention.

[0029] Preferably, the relationship between the resistance and the temperature of the resistance heating device used by the electronic data processing and / or control device is a device-specific relationship between the resistance and the temperature of the resistance heating device determined specifically for the resistance heating device.

[0030] In a preferred embodiment of the method according to the invention, the electronic data processing and / or control device compares the sensory detected temperature change of the resistance heating device with a calculated temperature change of the resistance heating device in order to verify the sensory detected temperature of the resistance heating device.

[0031] Furthermore, the following method according to the invention is advantageous, wherein the relationship between the resistance and the temperature of the resistance heating device used for calculating the temperature is determined by an electronic data processing and / or control device, in particular within the framework of a device program. Alternatively or additionally, the method comprises initially storing the relationship between the resistance and the temperature of the resistance heating device used for calculating the temperature, in particular within the framework of a device program, by an electronic data processing and / or control device. Furthermore, the method can include subsequently changing, in particular updating, the relationship between the resistance and the temperature of the resistance heating device used for calculating the temperature, in particular within the framework of a device program, by an electronic data processing and / or control device. Preferably, the relationship between the resistance and the temperature of the resistance heating device is derived from at least two value pairs, wherein a first value pair assigns a first temperature value of the resistance heating device to a corresponding first resistance value of the resistance heating device, and a second value pair assigns a second temperature value of the resistance heating device to a corresponding second resistance value of the resistance heating device. Preferably, the method comprises determining the first value pair and / or the second value pair by the heating system.

[0032] In a further preferred embodiment of the method according to the invention, the electronic data processing and / or control device checks an initial relationship between the resistance and the temperature of the resistance heating device, which is stored in a memory of the electronic data processing and / or control device, in particular when the heating system is started. Alternatively or additionally, the initial relationship between the resistance and the temperature of the resistance heating device is specifically adjusted by the electronic data processing and / or control device, in particular when the heating system is started, which is stored in a memory of the electronic data processing and / or control device. In addition, the following method is preferred, in which, in particular before or at the start of the operation of the heating system, the electronic data processing and / or control device determines an initial relationship between the resistance and the temperature of the resistance heating device from a first initial value pair stored in the memory of the electronic data processing and / or control device and a calculated second initial value pair, the first initial value pair assigning a first temperature value of the resistance heating device to a corresponding first resistance value of the resistance heating device, and the second initial value pair assigning a second temperature value of the resistance heating device to a corresponding second resistance value of the resistance heating device. In addition, the method may include storing the determined initial relationship between the resistance and the temperature of the resistance heating device in a memory of the electronic data processing and / or control device. Alternatively or additionally, at least one value pair of the relationship between resistance and temperature of the resistance heater is compared with a value pair determined by the heating system during operation of the heating system. Furthermore, the current resistance value of the resistance heater can be detected by a measuring circuit of the heating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The preferred embodiments of the present invention will be specifically described and illustrated below with reference to the accompanying drawings.

[0034] Figure 1 An embodiment of a heating system according to the present invention is shown schematically;

[0035] Figure 2 A resistance heating device and a measuring circuit of a device for determining the temperature of a resistance heating device according to the invention are shown;

[0036] Figure 3 shows the relationship between the resistance and the temperature of a resistance heating device determined within the framework of the method according to the invention; and

[0037] Figure 4 The relationships between the resistance and the temperature of the resistance heating device, which are stored in different devices according to the invention, are shown before and after the device has been put into operation. DETAILED DESCRIPTION

[0038] Figure 1A heating system 100 is shown, which can be used in conjunction with a vehicle. The heating system 100 shown can, for example, be at least partially integrated into a vehicle seat in order to implement a heating function on the vehicle seat.

[0039] The heating system 100 has a resistance heating device 102 which is designed as a heating system. The resistance heating device 102 therefore has one or more heating conductors. The heating system 100 also includes a device 10 for determining the temperature of the resistance heating device 102 .

[0040] The device 10 allows redundant temperature detection, thereby minimizing the risk of erroneous temperature detection. The device 10 has a temperature sensor 12, which is arranged in the vicinity of the resistance heating device 102. Alternatively, the temperature sensor 12 can also be arranged directly on the resistance heating device 102 and in contact with the resistance heating device 102. The thermal coupling of the temperature sensor 12 to the resistance heating device 102 allows the temperature of the resistance heating device 102 to be sensed by the temperature sensor 12. The temperature sensor 12 and the resistance heating device 102 are electrically conductively connected to an electronic data processing and / or control device 14 of the device 10. The electronic data processing and / or control device 14 can be designed as a microcontroller and is further used to verify the temperature of the resistance heating device 102 sensed by the temperature sensor 12.

[0041] In order to verify the temperature of the resistance heating device 102 sensed by the temperature sensor 12, the electronic data processing and / or control device 14 calculates the temperature change of the resistance heating device 102 based on the change in the resistance value of the resistance heating device 102 and the relationship 26, 26a-26c between the resistance R and the temperature T of the resistance heating device 102. Within the framework of the measurement value verification, the temperature change of the resistance heating device 102 calculated based on the resistance change is compared with the temperature change sensed by the resistance heating device 102. If the temperature change of the resistance heating device 102 sensed by the temperature sensor 12 and the temperature change of the resistance heating device 102 calculated by the electronic data processing and / or control device 14 agree or do not exceed the tolerance, then a first group of functional disturbances of the temperature sensor 12 can already be excluded within the framework of the verification. Functional disturbances that lead to dynamic or changing measured value deviations, such as short circuits or open circuits in the region of the temperature sensor 12, can be reliably determined by comparing the temperature change sensed and the calculated temperature change.

[0042] Furthermore, the electronic data processing and / or control device 14 is provided for updating the relationship 26, 26a-26c between the resistance R and the temperature T of the resistance heating device 102 used for calculating the temperature during operation. By continuously updating the relationship 26, 26a-26c between the resistance R and the temperature T of the resistance heating device 102, a continuous recalibration of the electronic data processing and / or control device 14 is achieved during operation of the device 10. In this way, constant temperature deviations or constant temperature shifts can also be detected when the temperature is detected by the temperature sensor 12. The first verification process, which is carried out to compare the temperature change detected by the sensor with the calculated temperature change, is thus supplemented by continuously recalibrating the electronic data processing and / or control device 14 to update the relationship 26, 26a-26c between the resistance R and the temperature T of the resistance heating device 102. In general, a reliable measurement value verification can be achieved without the need for an additional temperature sensor.

[0043] The relationship 26, 26a-26c between the resistance R and the temperature T of the resistance heating device 102 used by the electronic data processing and / or control device 14 is a device-specific relationship between the resistance R and the temperature T of the resistance heating device 102 that is determined specifically for the resistance heating device 102. The relationship 26, 26a-26c between the resistance R and the temperature T of the resistance heating device 102 that is specifically matched to the resistance heating device 102 can be determined within the framework of the device program of the device 10 by the manufacturer or automatically when the device 10 is started.

[0044] The heating system 100 may be integrated into the vehicle's electronic system via wiring 104 .

[0045] Figure 2 The measuring circuit 16 is shown, by means of which the current resistance value of the resistance heating device 102 can be detected. The measuring circuit 16 comprises a high-side switch 18, which is provided for switching a positive supply voltage. In addition, the measuring circuit 16 comprises a low-side switch 20, which is provided for switching a negative supply voltage. In addition, the measuring circuit 16 comprises a resistor 22 and a field effect transistor 23, which generates a superimposed voltage or a superimposed current. In addition, the measuring circuit 16 comprises a voltage divider 24, which is used to protect the electronic data processing and / or control device 14.

[0046] Figure 3 The relationship 26 between the resistance R and the temperature T of the resistance heating device 102 is shown, which is used by the electronic data processing and / or control device 14 to calculate the temperature. The electronic data processing and / or control device 14 derives the relationship 26 between the resistance R and the temperature T of the resistance heating device 102 from two value pairs. The first value pair gives a first temperature value T of the resistance heating device 102. 1The first resistance value R corresponding to the resistance heating device 102 is configured 1 The second value is given to the second temperature value T of the resistance heating device 102 2 The corresponding second resistance value R of the resistance heating device 102 is configured 2 The temperature measurement value T of the resistance heating device 102 1 , T 2 The resistance value R of the resistance heating device 102 can be detected by means of the temperature sensor 12 of the device 10 and / or calculated by the electronic data processing and / or control device 14 of the device 10. 1 , R 2 This can be detected with the aid of the measuring circuit 16 of the device 10 .

[0047] From the two value pairs, electronic data processing and / or control device 14 calculates a linear relationship 26 between resistance R and temperature T of resistance heating device 102 , wherein the linear relationship is a linear resistance-temperature characteristic curve in this case.

[0048] Figure 4 Three different relationships 26a-26c between the resistance R and the temperature T of the resistance heating device 102 are shown at different time points I-III. Time point I relates to the end time point of the manufacturing process of the device 10. Time point II relates to the start of operation of the device 10, i.e., the first use of the device 10. Time point III relates to an operating time point after the device 10 has been put into operation.

[0049] The electronic data processing and / or control device 14 is provided for determining the resistance value R 1a and temperature value T 1a The first initial value pair is formed and stored in the memory of the electronic data processing and / or control device 14. The first initial value pair temperature value T 1a For example, it is the ambient temperature of the device 10 at the end of the manufacturing process, that is, the factory temperature of the manufacturing plant. Before the device 10 starts to operate, the temperature value T is calculated by the electronic data processing and / or control device 14 based on the known characteristics of the intact resistance heating device 102. 2a and the resistance value R 2a The second initial value pair is formed. Temperature value T 2a For example, this is a target temperature which is set in anticipation of the subsequent operation of the system 10 .

[0050] The electronic data processing and / or control device 14 can thus already determine an initial relationship 26a between the resistance R and the temperature T of the resistance heating device 102 before the device 10 is put into operation. Said initial relationship 26a between the resistance R and the temperature T of the resistance heating device 102 allows a rapid test of the temperature sensor 12 after the end of the manufacturing process and the actual start of operation of the device 10 (see diagram I).

[0051] Graph II shows a relationship 26b between the resistance R and the temperature T of the resistance heating device 102, which is determined by the electronic data processing and / or control device 14 at the start of operation of the device 10 and is used to update the graph 26a. The electronic data processing and / or control device 14 determines the relationship between the resistance R and the temperature T of the resistance heating device 102 at the start of operation of the device 10 and is used to update the graph 26a. 1b , T 2b Determine the two resistor values ​​R 1b , R 2b The electronic data processing and / or control device 14 therefore provides, during startup, for updating the initial relationship 26a stored within the framework of the device program by the relationship 26b determined during startup of the device 10 .

[0052] Furthermore, the electronic data processing and / or control device 14 is configured to compare at least one value pair of the relationship 26b between the resistance R and the temperature T of the resistance heating device 102 with a value pair determined during operation of the device 10 during operation of the device 10. If a slow offset is detected at the test temperature by the temperature sensor 12, the electronic data processing and / or control device 14 is configured to update the relationship 26b again, wherein a new relationship 26c is determined within the scope of the update. In this case, two value pairs T are determined again. 1c , R 1c and T 2c , R 2c And it is used to calculate the new resistance temperature characteristic curve 26c.

[0053] The electronic data processing and / or control device 14 can update the relationship 26a, 26b, 26c between the resistance R and the temperature T of the resistance heating device 102, and can also ensure a reliable verification process of the temperature measurement value determined by the temperature sensor 12 when the device characteristics change. The temperature calculation is thus carried out accurately not only in the delivery state of the device 10 but also after wear and tear has occurred, so that additional temperature sensors for verification can be completely omitted.

[0054] Reference numerals list

[0055] 10. Equipment

[0056] 12 Temperature Sensor

[0057] 14 Electronic data processing and / or control devices

[0058] 16 Measurement Circuit

[0059] 18 High side switch

[0060] 20 Low-side switch

[0061] 22 Resistors

[0062] 23 Field Effect Transistor

[0063] 24 Voltage Divider

[0064] 26, 26a-26c Relationship

[0065] 100 Heating system

[0066] 102 resistance heating device

[0067] 104 lines

[0068] T Temperature

[0069] T 1 , T 2 Temperature value

[0070] T 1a , T 2a Temperature value

[0071] T 1b , T 2b Temperature value

[0072] T 1c , T 2c Temperature value

[0073] R Resistance

[0074] R 1 , R 2 Resistance Value

[0075] R 1a , R 2a Resistance Value

[0076] R 1b , R 2b Resistance Value

[0077] R 1c , R 2c Resistance Value

[0078] Time points I-III.

Claims

1. A device (10) for determining the temperature of a resistance heating device (102), comprising a temperature sensor (12) which is provided for sensing the temperature of the resistance heating device (102), wherein: The temperature sensor is configured to be arranged on the resistance heating device or in a vicinity of the resistance heating device; The device is characterized in that the device has an electronic data processing and / or control device (14), which is configured to calculate the temperature change of the resistance heating device (102) based on the change of the resistance value of the resistance heating device (102) and the relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) and verify the temperature of the resistance heating device (102) sensed by the temperature sensor (12) based on the calculated temperature change of the resistance heating device (102), wherein the electronic data processing and / or control device (14) is configured to update the relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used for calculating the temperature during operation.

2. The device (10) according to claim 1, characterized in that The electronic data processing and / or control device (14) is configured to compare a sensory detected temperature change of the resistance heating device (102) with a calculated temperature change of the resistance heating device (102) in order to verify the sensory detected temperature of the resistance heating device (102).

3. The device (10) according to claim 1 or 2, characterized in that The relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used by the electronic data processing and / or control device (14) is a device-specific relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102).

4. The device (10) according to claim 1 or 2, characterized in that The electronic data processing and / or control device (14) is configured to determine and / or initially store a relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) for use in calculating the temperature.

5. The device (10) according to claim 1 or 2, characterized in that The electronic data processing and / or control device (14) is configured to automatically change, at regular or irregular time intervals, the relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used for calculating the temperature.

6. The device (10) according to claim 1 or 2, characterized in that The electronic data processing and / or control device (14) is configured to derive a relationship (26, 26a-26c) between a resistance (R) and a temperature (T) of the resistance heating device (102) from at least two value pairs, wherein a first value pair gives a first temperature value (T1, T2) of the resistance heating device (102) 1a , T 1b , T 1c ) configures the first resistance value (R1, R 1a , R 1b , R 1c ), and the second value is given to the second temperature value (T2, T 2a , T 2b , T 2c ) configures the corresponding second resistance value (R2, R 2a , R 2b , R 2c ).

7. The device (10) according to claim 6, characterized in that The device (10) is configured to determine the first value pair and / or the second value pair itself.

8. The device (10) according to claim 1 or 2, characterized in that An initial relationship (26a) between the resistance (R) and the temperature (T) of the resistance heating device (102) is stored in a memory of the electronic data processing and / or control device (14), wherein the electronic data processing and / or control device (14) is configured to check and / or adjust the stored initial relationship (26a) between the resistance (R) and the temperature (T) of the resistance heating device (102) for the resistance heating device (102) at the start of operation.

9. The device (10) according to claim 8, characterized in that The electronic data processing and / or control device (14) is configured to determine an initial relationship (26a) between the resistance (R) and the temperature (T) of the resistance heating device (102) from a first initial value pair stored in the memory and a calculated second initial value pair before or when the device (10) starts operating, and to store the initial relationship in the memory. 1a ) configures the first resistance value (R 1a ), the second initial value is given to the second temperature value (T 2a ) configures the corresponding second resistance value (R 2a ).

10. The device (10) according to claim 1 or 2, characterized in that The electronic data processing and / or control device (14) is configured to compare, during operation, at least one value pair of a relationship (26, 26a-26c) between a resistance (R) and a temperature (T) of the resistance heating device (102) with a value pair determined by the device (10) during operation of the device (10).

11. The device (10) according to claim 1 or 2, characterized in that A measuring circuit (16) is provided for detecting a current resistance value of the resistance heating device (102).

12. The device (10) according to claim 4, characterized in that The electronic data processing and / or control device (14) is configured to determine and / or initially store within the framework of a device program a relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used for calculating the temperature.

13. The device (10) according to claim 1 or 2, characterized in that The electronic data processing and / or control device (14) is configured to continuously update a relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used for calculating the temperature.

14. A heating system (100), comprising: - a resistance heating device (102); and - a device (10) for determining the temperature of said resistance heating device (102); It is characterized in that The device (10) is constructed according to any one of the preceding claims.

15. The heating system (100) according to claim 14, characterized in that The resistance heating device (102) is designed as a heating system and comprises one or more heating conductors.

16. The heating system (100) according to claim 14, characterized in that The heating system (100) is configured for use in a vehicle.

17. A method for operating a heating system (100) according to any one of claims 14 to 16, comprising the following steps: - sensory detection of the temperature of the resistance heating device (102) of the heating system (100) by means of a temperature sensor (12) of the heating system (100); It is characterized by the following steps: - calculating the temperature change of the resistance heating device (102) based on the change of the resistance value of the resistance heating device (102) and the relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) by means of an electronic data processing and / or control device (14) of the heating system (100); - verifying the temperature of the resistance heating device (102) detected by the temperature sensor (12) based on the calculated temperature change of the resistance heating device (102).

18. The method according to claim 17, characterized in that The electronic data processing and / or control device (14) compares the sensory detected temperature change of the resistance heating device (102) with the calculated temperature change of the resistance heating device (102) in order to verify the sensory detected temperature of the resistance heating device (102).

19. The method according to claim 17 or 18, characterized in that At least one of the following steps: - determining, by means of the electronic data processing and / or control device (14), a relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used for calculating the temperature; - initially storing, by means of the electronic data processing and / or control device (14), a relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used for calculating the temperature, - the relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used for calculating the temperature is changed during operation by the electronic data processing and / or control device (14).

20. The method according to claim 17 or 18, characterized in that At least one of the following steps: - checking an initial relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) by means of the electronic data processing and / or control device (14), the initial relationship being stored in a memory of the electronic data processing and / or control device (14); - adjusting, by means of the electronic data processing and / or control device (14), an initial relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102), the initial relationship being stored in a memory of the electronic data processing and / or control device (14); - determining an initial relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) by means of the electronic data processing and / or control device (14) from a first initial value pair stored in a memory of the electronic data processing and / or control device (14) and a calculated second initial value pair, the first initial value pair giving a first temperature value (T) of the resistance heating device (102); 1a ) configures the first resistance value (R 1a ), the second initial value is given to the second temperature value (T 2a ) configures the corresponding second resistance value (R 2a ); - storing the determined initial relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) in a memory of the electronic data processing and / or control device (14); - comparing at least one value pair of the relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) with a value pair determined by the heating system (100) during operation of the heating system (100); - detecting the current resistance value of the resistance heating device (102) by means of a measuring circuit (16) of the heating system (100).

21. The method according to claim 19, characterized in that At least one of the steps is carried out within the framework of a device program.

22. The method according to claim 19, characterized in that The change is an update of the relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) used by the electronic data processing and / or control device (14) for calculating the temperature.

23. The method according to claim 20, characterized in that At least one of the steps is performed when the heating system (100) starts operating.

24. The method according to claim 20, characterized in that The determination of an initial relationship (26, 26a-26c) between the resistance (R) and the temperature (T) of the resistance heating device (102) can be performed before the heating system (100) begins operation.

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