Device for temperature determination

Abstract

A device (100) for determining temperature information (130) from a sensor device (200) configured to transmit sensor information by temporally limited electrical pulses (210) according to a defined protocol, the device comprising a data processing unit (110) configured to: call reference data (120) on a correlation between a pulse duration (215) of the electrical pulses (210) and a thermal effect in the sensor device (200); measure a pulse duration (215) of at least one of the electrical pulses (210); and determine the temperature information (130) based on the measured at least one result and the reference data (120).

Description

Technical Field

[0001] The present invention relates to an apparatus and method for determining temperature by means of pulse width in data transmission from a sensor, and particularly to temperature sensing in an active speed sensor. Background Technology

[0002] The transmission of data from sensors is typically performed via a series of time-constrained electrical pulses according to a prescribed data transmission protocol. For example, a protocol used in active speed sensors in passenger cars and commercial vehicles, authored by the German Association of the Automotive Industry (VDA) and Daimler AG, was published as a VDA recommendation on February 13, 2008, entitled "Requirement Specifications for Standardized Interface for WheelSpeed ​​Sensors with Additional Information - AK-Protocol Version: 4.0". This protocol transmits sensor data via two current intensities using Manchester encoding, outputting information about speed, direction of rotation, air gap, and sensor condition. The AK protocol, in particular, does not provide information about temperature within the sensor, even if the sensor itself detects such a temperature, for example, through its own internal sensor. This excludes the transmission of temperature information from the speed sensor without using additional hardware or deviating from or modifying the given standard.

[0003] However, in situations like those described above, temperature measurements from the speed sensor and / or its surrounding environment are required. Therefore, control devices, for example, in the realm of braking systems or general components of vehicle electronics, may require indications of the temperature of bearings (Lager) on commercial vehicle axles or trailers. Here, for example, it might be desirable to provide as accurate a description of the temperature in and around the speed sensor as possible, or to issue warnings when the temperature is too high. However, due to technical limitations or cost or efficiency reasons, the use of other sensors or components for direct temperature measurement, as well as deviations from established data transmission protocols, should be avoided. Summary of the Invention

[0004] At least a portion of the problem mentioned is solved by the device according to claim 1, the sensor system according to claim 4, the vehicle according to claim 6, the method according to claim 8, the method according to claim 9, and the computer program product according to claim 11. Dependent claims define other advantageous embodiments of the subject matter of the independent claims.

[0005] This invention relates to an apparatus for determining temperature information from a sensor device configured to transmit sensor information via time-constrained electrical pulses according to a defined protocol. The apparatus is characterized by a data processing unit configured to measure the pulse duration of at least one of the electrical pulses. This pulse duration may be defined, in particular, by a protocol. The data processing unit is also configured to retrieve reference data relating to a correlation between the pulse duration and thermal effects in the sensor device, and to determine the temperature information based on at least one measurement result and the reference data.

[0006] Temperature information here can be, for example, a single value, but it can also be a change or rate of increase in temperature or temperature range within or near the sensor device. The sensor device must include at least one sensor that outputs detected data as sensor information, and include a device or module for converting the transmitted sensor information into a transmission protocol. Transmission is carried out via a suitable electrical connection, such as an electrical wire. This protocol can be, in particular, the already mentioned AK protocol, but can also be a transmission scheme that encodes the sensor information itself via pulse width modulation, for example. In particular, embodiments are configured such that the transmitted sensor information does not contain temperature information itself. However, this limitation is not necessary for advantageous applications. Instead, temperature information can be determined, for example, by a data processing unit within the device, or it can be included in the sensor information and thus redundantly present. Therefore, the device can use temperature information, for example, for the purpose of monitoring the sensor's performance.

[0007] Measurable and reproducible correlations have been observed between the pulse duration of electrical pulses and thermal effects in such sensor devices. These correlations can be attributed to the functional modes of electrical switching circuit components or semiconductor assemblies present in the sensor device, even if not fully defined in detail. This is jointly generated; in particular, the PN junctions in diodes, transistors, or oscillators exhibit temperature drift. This temperature drift, or rather the effect on pulse width obtained from a large number of components through temperature drift, is used by the device to obtain conclusions about the temperature in the sensor.

[0008] The device may include additional components or connecting elements besides the data processing unit. In an embodiment, the data processing unit may be integrated, for example, into a control device for a vehicle's braking system.

[0009] The construction of a device for retrieving reference data is widely explained. Therefore, the reference data can be stored in the device's memory units in the form of a list, table (or "look-up table"), characteristic curve, or function. However, retrieving reference data can also include, for example, the transmission, measurement, and / or storage of temperatures. For instance, the device can access one or more values ​​of the slope of at least a segmented linear correlation between the temperature in or on a sensor device and the pulse width, which exists in a stored form. Reference points for temperature determination can be obtained or stored, for example, by measuring the pulse width at predefined time points, so that the temperature can then be calculated from the pulse widths measured between the predefined time points based on these stored reference data.

[0010] Optionally, the reference data has at least one of the following characteristics:

[0011] The reference data specifies the temperature assigned to at least one pulse duration of the electrical pulse for that pulse duration.

[0012] The reference data specifies a linear correlation (e.g., by a slope value) between temperature and the pulse duration of the electrical pulse.

[0013] - The reference data specifies a quantized (e.g., segmented) or non-linear correlation between temperature and the pulse duration of the electrical pulse.

[0014] The reference data specifies calibration data associated with the sensor, which defines the deviation of the sensor device from a predefined correlation between temperature and the pulse duration of the electrical pulse.

[0015] Here, reference data can be presented, in particular, as a list or table of pulse width values ​​and associated temperature or correction values—independently or in conjunction with this—as well as, in an abstract manner, as a characteristic curve for temperature, for example, as previously mentioned, in the form of slope values ​​or rates of change for linear correlations. The conversion or determination of temperature information from pulse width measurements can be performed over a full or finite temperature or pulse width range.

[0016] Optionally, the data processing unit is configured to compare the temperature information with at least one threshold after determining the temperature information and trigger at least one alarm after the threshold is exceeded.

[0017] Here, the warning function can be used, for example, to monitor the temperature near the sensor (e.g., in a commercial vehicle) and to output a warning once or in stages in the event of a high temperature (e.g., when the axle of a commercial vehicle exceeds 180°C).

[0018] The embodiments also relate to a sensor system having a speed sensor for determining the rotational speed in a vehicle. The sensor system is configured to transmit sensor information from the speed sensor via time-limited electrical pulses according to a defined protocol, characterized by a device for determining temperature information from the speed sensor or from its surrounding environment.

[0019] Optionally, the transmission of sensor information is performed according to a protocol that does not inherently include the transmission of temperature information. Such a protocol could be, in particular, the previously mentioned "Requirements Specification for Standardized Interface of Wheel Speed ​​Sensor with Additional Information, AK Protocol Version: 4.0". Alternatively, embodiments of the invention are also applicable to other sensor protocols, such as PSI5 (Peripheral Sensor Interface 5).

[0020] The embodiments further relate to a vehicle characterized by at least one such sensor system.

[0021] Such sensor systems are particularly useful in commercial vehicles or trailers, where speed sensors for measuring wheel rotation speed are integrated. Data from the speed sensors is transmitted, for example, to the control unit of the braking system. Interestingly, it is of interest to monitor the temperature in the bearings of the monitored wheels on the axles of the commercial vehicle or trailer. With this device, the temperature in the bearings can be inferred by monitoring the temperature in the speed sensor. As mentioned earlier, active speed sensor devices sometimes have their own internal temperature sensors, but the relevant information is not available through the AK protocol often used in this environment. The proposed solution makes the temperature information from the speed sensor available without deviating from the protocol standard or using additional hardware on or near the sensor device.

[0022] Optionally, the data processing unit is configured to include a predefined systematic correction in the determination of the temperature information in order to determine the temperature at a predefined location in the vehicle near the speed sensor.

[0023] As mentioned above, such a predefined location could be, for example, in the bearing of a commercial vehicle axle. The specifications used to correct the temperature information determined by the pulse width could be, for example, programmed into the data processing unit, or stored in, for example, reference data in the form of another list or table.

[0024] The embodiments also relate to a method for measuring temperature information from a sensor device configured to transmit sensor information to a receiver via time-constrained electrical pulses according to a defined protocol, wherein the receiver has reference data relating the pulse duration of the electrical pulses to thermal effects in the sensor device. The method is characterized by the following steps:

[0025] - Measure the pulse duration of at least one of the electrical pulses;

[0026] The temperature information is determined by at least the measured pulse duration and the reference data.

[0027] Temperature information can be determined indirectly, or by means of calibration, as described above. The receiver can store the reference data itself or retrieve the reference data from a remote memory via transmission.

[0028] Furthermore, embodiments relate to a method for generating reference data regarding the correlation between the pulse duration of a time-constrained electrical pulse and thermal effects for a sensor device configured to transmit sensor information to a receiver via such electrical pulse, and wherein the sensor device is heated and subsequently cooled during a manufacturing process (e.g., in the context of overmolding using plastics). The method includes the following steps:

[0029] - Provide sensor devices during the manufacturing process;

[0030] - Provide a receiver configured to receive sensor information and determine the pulse duration;

[0031] - Repeatedly transmit sensor information from the sensor device to the receiver, and simultaneously continuously measure at least one temperature in the sensor device during heating (e.g., in the case of overmolding using plastics) and subsequent cooling;

[0032] - Based on the transmitted sensor information and the temperature measurement in the sensor device, determine the correlation between the pulse duration and the thermal effect in the sensor device;

[0033] - Reference data is determined from at least one result of the measurement.

[0034] Because the sensor is manufactured using a plastic overmolding process, it is possible to directly compare the temperature within the sensor with the pulse width during production. The content of the sensor information is not important here. Especially in speed sensor systems designed for commercial vehicles, the direct advantage of this method lies in its direct integration into the manufacturing process; no additional temperature chamber is required for calibration. Therefore, characteristic curves representing sensor features are generated solely through the overmolding and cooling processes.

[0035] During the time between manufacturing the sensor device and installing it, for example, in a vehicle, reference data can be stored, for example, in a database, or, if an internal sensor memory exists, in the sensor itself. Particularly in the automotive field, speed sensors typically have customer-specific storage areas available for this purpose. Discrete measurement sequences can be improved through computational processes in the data processing unit or other components within the device, for example, through segmental linear or polynomial interpolation or extrapolation.

[0036] Data transfer to the device's data processing unit or memory element can, for example, be performed during functional testing, or in the automotive field, during end-of-line testing. Particularly in the automotive field, transfers from sensor memory or via access to a central database are suitable in the workshop. In this way, temperature sensing remains possible even if the sensors in the vehicle are replaced.

[0037] Optionally, determining the reference data includes at least one of the following steps:

[0038] -Average the results of multiple measurements of the correlation between pulse duration and thermal effects on a sensor device;

[0039] -Average the results of measurements on the correlation between pulse duration and thermal effects for multiple sensor devices;

[0040] - Determine the functional correlation between pulse duration and thermal effect through compensation calculations.

[0041] These steps are particularly important for creating sensor-type-specific characteristic curves for implementations stored in the data processing unit, so that sensor-specific calibration data or data can be improved and / or completed as needed.

[0042] The embodiments also relate to a computer program product having software code stored thereon, the computer program product being configured, when the software code is implemented by a machine that processes data, to perform the method described above for measuring temperature information from a sensor device.

[0043] The following summarizes some advantageous applications and implementations: Transmission protocols for sensor information (e.g., from speed sensors), without temperature transmission, were first used in the automotive industry in braking systems. This is especially true for the AK protocol. Installing additional hardware (e.g., additional electrical wires or additional temperature sensors) is as costly as changing the protocol. This leads to the basic idea: utilizing the effective broadening of electrical pulses transmitted through the sensor device, which occurs due to thermal motion within the sensor device. By comparing stored reference data with the temperature-related pulse broadening, the temperature in or near the sensor can be inferred.

[0044] One application area is systems that transmit data according to the AK protocol, as described above. However, protocols that themselves work with pulse width modulation are not excluded from the application of the above-mentioned basic ideas. Therefore, the standard protocol for pulse width modulation (PWM) sets a cycle length, which is signaled, for example, by an initial pulse used to mark the start of the cycle. This cycle can also vary due to thermal effects, and therefore, it is feasible to measure temperature according to the above-mentioned basic ideas.

[0045] In expanded applications, for example, the temperature near a sensor can be systematically inferred from the measurement of pulse width. This is useful, for example, in braking systems where the temperature of the speed sensors in the axle bearings of the wheel, rather than the temperature of the braked wheel's speed sensor, is of interest. The structural arrangement of the speed sensors determines the correlation between the temperature in the bearing and the temperature of the speed sensors. By controlling the measurement of pulse widths for different temperatures in the bearing, correction values ​​can be obtained, for example, and these correction values ​​are incorporated into the reference data or the determination of the temperature.

[0046] In a similar manner, temperature gradients or temperature profiles can be obtained by determining the temperature of a sensor device at multiple locations that are fixed relative to each other.

[0047] Finally, the embodiments also apply to redundant temperature determination, for example, if the sensor has already measured the temperature and transmitted it in the sensor information. Here, current methods, independent of the construction of the sensor used to measure and transmit temperature, can be used, for example, to monitor the high efficiency of the sensor. Therefore, temperature or temperature information can be transmitted by an optionally existing temperature sensor using pulse width modulation or other transmission protocols (e.g., along with other information). In pulse width modulation, the width of each pulse changes purposefully in a predetermined manner. However, temperature changes cause these predetermined pulse width changes to change in a temperature-dependent manner, and other embodiments use this as additional temperature detection. The advantage is that these two temperature detections can be effectively performed at different locations, for example, if the temperature sensor is located at a different location than the electronics used for pulse width modulation. This also allows the determination of temperature gradients or temperature profiles (i.e., the spatial correlation of temperature).

[0048] The following scheme can be used as an example to implement the aforementioned method, taking the braking system in a vehicle as an example:

[0049] - The sensor is advantageously heated and cooled during its manufacturing process; here, specific sensor parameters concerning the correlation between the transmission pulse width and temperature are recorded;

[0050] - The correction parameters are calculated from the recorded data, for example, when there is a sensor type-specific characteristic curve, and the correction parameters are stored in the sensor data memory and / or database;

[0051] If a sensor is installed, the calibration parameters are retrieved from either the sensor's memory or a database and stored in the control unit connected to the sensor. Alternatively, where high measurement accuracy is not required, characteristic curves or standard parameters may be used in the control unit.

[0052] The control unit is configured to measure the pulse width and thus infer the temperature on the sensor or in the bearing. Here, it can correct the determined temperature based solely on a standard correlation using stored calibration parameters.

[0053] - In addition, especially for bearings, the control unit can issue a warning for temperatures exceeding a predefined threshold.

[0054] For example, the implementation of a pure warning threshold can be used in a commercial vehicle in which a speed sensor measures the rotational speed of the wheels, and the temperature on or near the wheel axle should be monitored:

[0055] -Commercial vehicles, for example, parked overnight, allow the temperature in the sensors, on the axle, or in the braking system to be compensated;

[0056] - By transmitting information from the sensor, the device can determine a reference point for the correlation between pulse width and temperature, for example, by measuring the pulse width and comparing it with external temperature information;

[0057] - Using the slope value provided as reference data to the data processing unit for the linear correlation between pulse width and temperature, the pulse width can be correlated with temperature in subsequent runs. At, for example, a temperature of 180°C (e.g., corresponding to a pulse duration of 55 μs), a warning can then be output. Attached Figure Description

[0058] Embodiments of the invention will be better understood through the following detailed description and the accompanying drawings of various embodiments. However, these embodiments should not be construed as limiting the disclosure of specific implementations, but are for explanation and understanding only.

[0059] Figure 1 A schematic diagram is shown for one embodiment of the present invention;

[0060] Figure 2 This shows a typical pulse sequence according to the AK protocol;

[0061] Figure 3 Results of a series of measurements showing the correlation between pulse width and temperature in the sensor device are presented;

[0062] Figure 4 This shows the status of the speed sensor in the vehicle.

[0063] Figure 5 The steps of a method for measuring temperature information from a sensor by pulse broadening are shown.

[0064] Figure 6 The steps for generating reference data are shown. Detailed Implementation

[0065] Figure 1A device 100 for determining temperature information 130 from sensor device 200 is schematically shown. Sensor device 200 is electrically connected to device 100 for transmitting sensor information via time-constrained electrical pulses 210 according to a defined protocol. Device 100 includes a data processing unit 110 that can access reference data 120 regarding the correlation between pulse duration 215 and temperature in sensor device 200. In the schematic shown, the reference data is stored in the memory of the data processing unit itself; however, it may also be stored elsewhere in the device. Data processing unit 110 measures the pulse duration 215 of at least one of the electrical pulses 210. It retrieves the reference data 120 to determine the temperature information 130 based on the measurement result and the reference data 120.

[0066] Figure 2 The diagram illustrates a typical sequence of electrical pulses 210 according to the AK protocol, which is specifically used for transmitting sensor information from a speed sensor 200 (not shown here) for use with wheels in a vehicle. The speed sensor 200 typically measures the wheel's rotational speed at a flywheel 330 (not shown here), for example, based on a spoke or tooth-based conduction. This conduction generates a speed pulse 211 at a rate proportional to the wheel's rotational speed. The pulses 210 transmitted by the speed sensor 200 are current pulses. This transmission occurs over a base current intensity 217 with two current intensities. A higher current intensity 219 (e.g., 28 mA) indicates the speed pulse 211 at the beginning of the pulse sequence, or data packet. Following the speed pulse 211, nine bits of information follow in the form of a lower current intensity 218 (output current), numbered from 0 to 8. Here, the electrical pulses 210 typically transmit these bits using Manchester encoding. The bit cells are time-dependent and subject to a duration (often referred to as t in the literature). p The duration is typically determined by the duration, or width, of the speed pulse 211. Within the bit unit, bits are encoded by changes in current intensity: for example, logic 1 is indicated by a rising current, and logic 0 by a falling current. The protocol's information content typically does not include temperature information from the speed sensor 200 or its surrounding environment.

[0067] The duration of the speed pulse 211, or bit cell (Bitzelle), can be used here as the pulse duration 215 and is measured in the data processing unit 110 (not shown). It is within a range of 50 μs ± 10 μs, depending on the temperature in the speed sensor 200. The speed sensor 200 operates in a vehicle and typically operates in an ambient environment with temperatures ranging from approximately -40°C to approximately 200°C. Therefore, a resolution of, for example, approximately 12°C per microsecond can be achieved by fully utilizing the temperature range.

[0068] Modifications to the encoding or other protocols are not obstacles to the advantageous use of the temperature sensing presented herein. To determine temperature information 130, it is only necessary to be able to measure the pulse duration 215.

[0069] Figure 3 An example of a measurement result 30 showing the correlation between the pulse duration 215 for the AK protocol and the temperature used for the speed sensor 200 (not shown here), as it is used in the vehicle area, is shown. In addition to the measurement result 30, a linearized line 60 calculated therefrom and a temperature warning threshold 70 are also shown.

[0070] The linearized line 60 has been obtained from the measurement result 30 through compensation calculations and can be used, for example, as a characteristic curve for the speed sensor 200 or other speed sensors of the same structural type. The linearized line 60 can also be replaced, in particular, by a more precisely matched curve, such as a polynomial.

[0071] If the determined temperature 130 rises above the warning threshold 70 during the operation of the speed sensor 200, the data processing unit 110, or the device 100 for determining the temperature, can, for example, report this to a higher-level system or output, for example, an alarm or warning.

[0072] Figure 4 This illustration shows a wheel speed sensor 200 used in a braking system in a vehicle. A cross-section can be seen in the plane surrounding the wheel's rotation axis, passing through the wheel axle 310 and a portion of the wheel carrier or wheel bearing unit 320. On the right is shown a sensor device in the form of a speed sensor 200, which determines the wheel's rotational speed through a conduction portion, for example, an opening 335 of a flywheel 330 stamped from sheet metal, and transmits this speed to an electronic control unit 100 (not shown here), such as an anti-lock braking system. The bearing 325 here is exemplarily constructed as a double-row tapered roller bearing or an angular contact ball bearing.

[0073] To monitor the temperature in bearing 325, a data processing unit 110 (not shown here) in the electronic control unit 100 can determine the temperature of the speed sensor 200 near the bearing. Furthermore, the data processing unit 110 can be further configured to infer the temperature in the bearing by applying a predefined correction to that temperature. Conversely, transmitting temperature measurements, for example, through measurement and encoding within the speed sensor 200 itself, or through temperature measurements from other sensors, would be costly and expensive due to the necessary changes in transmission protocols or the use of additional hardware considering the complexity of the wheel module.

[0074] Figure 5 The method illustrates steps for measuring temperature information 130 from a sensor device 200 configured to transmit sensor information to a receiver via time-constrained electrical pulses 210 according to a predetermined protocol, wherein the receiver has reference data 120 relating the pulse duration 215 of the electrical pulses to thermal effects in the sensor device 200. A first characterization step of the method involves measuring the pulse duration 215 of at least one of the electrical pulses 210. This measurement S10 is advantageously performed in the receiver. A second characterization step of the method involves determining the temperature information 130 S20 from at least the measured pulse duration 215 and the reference data 120. This determination may include further corrections.

[0075] Figure 6The steps of a method for generating reference data for a sensor device 200 are illustrated. The sensor device is configured to transmit sensor information to a receiver via a time-limited electrical pulse 210, and the sensor device is overmolded with plastic during the manufacturing process, heated therein, and subsequently cooled, to establish a correlation between the pulse duration 215 of the electrical pulse 210 and thermal effects in the sensor device 200. The sensor device 200 is connected to a provided receiver during the manufacturing process, the receiver being configured to receive the sensor information and measure the pulse duration 215. The characterization steps first include: repeatedly transmitting sensor information from the sensor device 200 to the receiver S50, while continuously measuring at least one temperature in the sensor device 200 during the heating and subsequent cooling periods within the scope of the plastic overmolding. Using the obtained data, as a next step, based on the transmission of sensor information S50 and the measurement of temperatures in the sensor device 200, a determination S60, or determination of the correlation between the pulse duration 215 and thermal effects in the sensor device 200, is made S70, based on at least one result of the determination S60. Finally, reference data 120 is determined S70 from the result of at least one determination of S60. When transmitting S50 sensor information and measuring temperature in sensor device 200, the content of the information is not necessarily important. Reference data 120 may be, for example, basic data of a characteristic curve relating pulse width 215 to temperature for the sensor type and / or sensor-specific data.

[0076] For the purpose of implementing this invention, the features of the invention disclosed in the specification, claims and drawings are essential, either individually or in any combination.

[0077] List of reference numerals

[0078] 30 Measurement Results

[0079] 60. The calculated linearized line

[0080] 70 Warning Threshold

[0081] 100 Devices for determining temperature information

[0082] 110 Data Processing Unit

[0083] 120 Reference Data

[0084] 123 Characteristic Curve

[0085] 127 Correction Data

[0086] 130 Temperature Information

[0087] 200 sensor devices

[0088] 210 electrical pulse

[0089] 211 Velocity Pulse

[0090] 215 Pulse Duration

[0091] 217 Base Current

[0092] 218 Low current

[0093] 219 high current

[0094] 310 wheel axle

[0095] 320 Wheel Bearing Unit

[0096] 325 wheel bearing

[0097] 330 flywheel

[0098] 335 flywheel opening

[0099] S10 measures pulse duration

[0100] S20 Determine temperature information

[0101] The S50 transmits sensor information and measures the temperature in the sensor device.

[0102] S60 Measurement of the correlation between temperature and pulse width

[0103] S70 Determine Reference Data

Claims

1. A device (100) for determining temperature information (130) from a speed sensor device (200), said speed sensor device being configured to transmit the speed sensor information via time-limited electrical pulses (210) according to a predetermined protocol, characterized in that, Data processing unit (110), the data processing unit being configured to: - Refer to reference data (120) regarding the correlation between the pulse duration (215) of the electrical pulse (210) and the thermal effect in the speed sensor device (200). - Measure the pulse duration (215) of at least one of the electrical pulses (210); and - The temperature information (130) is determined based on at least one result of the measurement and based on reference data (120).

2. The device (100) according to claim 1, characterized in that, The data processing unit (110) is configured to determine the temperature information (130) based on reference data (120), the reference data having at least one of the following characteristics: - The reference data (120) specifies a temperature assigned to at least one pulse duration (215) of the electrical pulse (210) for the pulse duration (215). - The reference data (120) specifies a linear correlation between temperature and the pulse duration (215) of the electrical pulse (210). - The reference data (120) specifies a quantized or non-linear relationship between temperature and the pulse duration (215) of the electrical pulse (210). - The reference data (120) specifies calibration data related to the speed sensor, which specifies a deviation from the predefined correlation between the speed sensor device (200) and the pulse duration (215) of the electrical pulse (210).

3. The device (100) according to claim 1 or 2, characterized in that, The data processing unit (110) is configured to compare the temperature information (130) with at least one threshold (70) after determining the temperature information (130), and to trigger at least one alarm after the threshold (70) is exceeded.

4. A sensor system having a speed sensor for determining rotational speed in a vehicle, the sensor system being configured to transmit sensor information from the speed sensor via time-limited electrical pulses (210) according to a predetermined protocol, characterized in that, The sensor system has a device (100) for determining temperature information from a speed sensor device according to any one of claims 1 to 3, in order to determine temperature information from the speed sensor or from the surrounding environment of the speed sensor (130).

5. The sensor system according to claim 4, characterized in that, The transmission of sensor information is performed according to a protocol that does not include the transmission of temperature information.

6. The sensor system according to claim 5, characterized in that, The protocol is "Requirements Specification for Standardized Interface of Wheel Speed ​​Sensor with Additional Information - AK Protocol, Version: 4.0".

7. A vehicle, characterized in that, The vehicle has at least one sensor system according to claim 4 or claim 5.

8. The vehicle according to claim 7, characterized in that, The data processing unit (110) is configured to include a predefined systematic correction in the determination of the temperature information (130) in order to determine the temperature at a predefined location in the vehicle near the speed sensor.

9. A method for measuring temperature information (130) from a speed sensor device (200), said speed sensor device being configured to transmit speed sensor information to a receiver via time-limited electrical pulses (210) according to a predetermined protocol, wherein, The receiver has reference data (120) relating the pulse duration (215) of the electrical pulse (210) to the thermal effect in the speed sensor device (200), characterized in that: - Measure (S10) the pulse duration (215) of at least one of the electrical pulses (210). - The temperature information (130) is determined by at least the measured pulse duration (215) and the reference data (120).

10. A method for generating reference data (120) relating the pulse duration (215) of a time-constrained electrical pulse (210) to a thermal effect on a speed sensor device (200), the speed sensor device being configured to transmit speed sensor information to a receiver via the electrical pulse (210), and the speed sensor device being heated and subsequently cooled during the manufacturing process, characterized in that: - Transmit speed sensor information from the speed sensor device (200) to the receiver (S50), and simultaneously continuously measure at least one temperature in the speed sensor device (200) during heating and subsequent cooling; - Based on the transmission of speed sensor information (S50) and the measurement of temperature in the speed sensor device (200), the correlation between the pulse duration (215) and the thermal effect in the speed sensor device (200) is determined (S60); - Reference data (120) is determined from at least one result of the determination (S60).

11. The method according to claim 10, characterized in that, Determining the reference data (120) includes at least one of the following steps: - The results of multiple measurements (S60) on the correlation between pulse duration (215) and thermal effects on a speed sensor device (200) are averaged; - The results of the determination (S60) of the correlation between pulse duration (215) and thermal effects on multiple speed sensor devices (200) are averaged; - The functional correlation between the pulse duration (215) and the thermal effect is determined by compensation calculation.

12. A computer program product having software code stored thereon, the computer program product being configured, when the software code is implemented by a machine that processes data, to perform the method according to claim 9.

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