DE102012223342A1 - Device for recognizing occupancy of seat by person using seat heater in motor car, has processing unit recognizing seat occupancy based on characteristics of electric current and voltage through and at heating element - Google Patents

Device for recognizing occupancy of seat by person using seat heater in motor car, has processing unit recognizing seat occupancy based on characteristics of electric current and voltage through and at heating element Download PDF

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DE102012223342A1
DE102012223342A1 DE201210223342 DE102012223342A DE102012223342A1 DE 102012223342 A1 DE102012223342 A1 DE 102012223342A1 DE 201210223342 DE201210223342 DE 201210223342 DE 102012223342 A DE102012223342 A DE 102012223342A DE 102012223342 A1 DE102012223342 A1 DE 102012223342A1
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seat
signal
heating element
voltage
occupancy
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German (de)
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Andreas Huber
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Bayerische Motoren Werke AG
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Bayerische Motoren Werke AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/0153—Passenger detection systems using field detection presence sensors
    • B60R21/0154—Passenger detection systems using field detection presence sensors in combination with seat heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/0024—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement for identifying, categorising or investigation of the occupant or object on the seat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/0035—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement characterised by the sensor data transmission, e.g. wired connections or wireless transmitters therefor; characterised by the sensor data processing, e.g. seat sensor signal amplification or electric circuits for providing seat sensor information
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/56—Heating or ventilating devices
    • B60N2/5678—Heating or ventilating devices characterised by electrical systems
    • B60N2/5685—Resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/0153—Passenger detection systems using field detection presence sensors
    • B60R21/01532—Passenger detection systems using field detection presence sensors using electric or capacitive field sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/002—Seats provided with an occupancy detection means mounted therein or thereon
    • B60N2/0021—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement
    • B60N2/003—Seats provided with an occupancy detection means mounted therein or thereon characterised by the type of sensor or measurement characterised by the sensor mounting location in or on the seat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2210/00—Sensor types, e.g. for passenger detection systems or for controlling seats
    • B60N2210/10—Field detection presence sensors
    • B60N2210/12—Capacitive; Electric field
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2210/00—Sensor types, e.g. for passenger detection systems or for controlling seats
    • B60N2210/30—Temperature sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2230/00—Communication or electronic aspects
    • B60N2230/30—Signal processing of sensor data

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Transportation (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

The device has a heating element arranged in a seat (1) of a motor car. A driver unit (3) is coupled with the element, and outputs a signal i.e. time-variable signal, to the element. The element is supplied with energy by the signal such that the element or seat parts are heated according to a function of a seat heater. A sensor is coupled with the element to measure characteristics of electric current through the element and/or time characteristics of voltage at the element in response to the signal. A processing unit (4) recognizes seat occupancy based on the signal and the characteristics. The signal is a pulsed voltage or a square wave voltage.

Description

Die Erfindung betrifft eine Vorrichtung zum Erkennen einer Sitzbelegung mithilfe einer Sitzheizung für ein Kraftfahrzeug.The invention relates to a device for detecting a seat occupancy by means of a seat heater for a motor vehicle.

Heutige Kraftfahrzeuge, insbesondere PKWs, sind mit vielfältigen Fahrerassistenz- und Sicherheitssystemen ausgestattet. Der Betrieb dieser Systeme macht es manchmal erforderlich festzustellen, ob ein Sitz in einem Kraftfahrzeug durch eine Person belegt ist. Ein Beispiel hierfür ist die Klimatisierung im Fond eines Kraftfahrzeugs, die typischerweise nur dann aktiviert werden braucht, wenn die Sitze dort von Personen belegt sind.Today's motor vehicles, especially cars, are equipped with a variety of driver assistance and safety systems. The operation of these systems sometimes makes it necessary to determine whether a seat in a motor vehicle is occupied by a person. An example of this is the air conditioning in the rear of a motor vehicle, which typically only needs to be activated when the seats are occupied there by people.

Aus der DE 10 2008 022 981 A1 ist ein Insassenerfassungssystem bekannt, in dem Widerstandsgitter einer Sitzheizung gleichzeitig mit Strom zum Heizen und zusätzlich unabhängig davon mit erzeugten Signalen in Sinuswellenform beaufschlagt werden. Aus der Antwort auf das Signal in Sinuswellenform wird auf die Belegung rückgeschlossen. Dieses System hat den Nachteil, dass es dedizierte Elektronik beziehungsweise Elektrik benötigt, um das Sinussignal zu erzeugen und auf das Widerstandsgitter zu koppeln.From the DE 10 2008 022 981 A1 an occupant detection system is known, in the resistance grid of a seat heating simultaneously with power for heating and additionally acted independently of generated signals in sine wave form. From the answer to the signal in sine wave form, the assignment is deduced. This system has the disadvantage of requiring dedicated electronics to generate the sinusoidal signal and couple it to the resistor grid.

Aufgabe an den Fachmann ist die Bereitstellung einer kostengünstigen Vorrichtung zur Sitzbelegungserkennung mithilfe einer Sitzheizung.Task to the expert is to provide a low-cost device for seat occupancy detection using a seat heater.

Die Aufgabe wird durch die Vorrichtung nach Anspruch 1 gelöst. Vorteilhafte Weiterbildungen sind in den abhängigen Ansprüchen definiert.The object is achieved by the device according to claim 1. Advantageous developments are defined in the dependent claims.

In einem Aspekt umfasst eine Vorrichtung zum Erkennen einer Sitzbelegung mithilfe einer Sitzheizung für ein Kraftfahrzeug: Ein Heizelement, das in einem Sitz eines Kraftfahrzeugs angeordnet ist; einen Treiber; wobei der Treiber mit dem Heizelement gekoppelt ist und an das Heizelement ein Signal ausgibt; wobei das Signal das Heizelement derart mit Energie versorgt, dass das Heizelement den Sitz oder Teile davon entsprechend der Funktion einer Sitzheizung erwärmt; einen Sensor; wobei der Sensor mit dem Heizelement gekoppelt ist und dazu eingerichtet ist, den Verlauf des elektrischen Stroms durch das Heizelement und/oder den zeitlichen Verlauf der Spannung an dem Heizelement in Reaktion auf das Signal zu messen; eine Verarbeitungseinheit; wobei die Verarbeitungseinheit dazu eingerichtet ist, anhand des Signals und des Verlaufs des Stroms und/oder der Spannung die Belegung des Sitzes durch eine Person zu erkennen.In one aspect, an apparatus for detecting a seat occupancy by means of a seat heater for a motor vehicle comprises: a heating element arranged in a seat of a motor vehicle; a driver; wherein the driver is coupled to the heating element and outputs a signal to the heating element; the signal energizing the heating element such that the heating element heats the seat or portions thereof in accordance with the seat heater function; a sensor; wherein the sensor is coupled to the heating element and is adapted to measure the course of the electrical current through the heating element and / or the time profile of the voltage across the heating element in response to the signal; a processing unit; wherein the processing unit is adapted to recognize the occupancy of the seat by a person on the basis of the signal and the course of the current and / or the voltage.

Auf diese Weise wird die Sitzbelegung anhand des Stromsignals erkannt, das für die normale Funktion der Sitzheizung verwendet wird. Zusätzliche Signalgeneratoren und Schaltkreise zum Verknüpfen des Heizsignals und des Messsignals werden nicht benötigt, was somit eine kostengünstigere Lösung darstellt als die im Stand der Technik bekannten Systeme. Gleichzeitig kann auf bereits vorhandene dedizierte Sensoren zur Sitzbelegungserkennung verzichtet werden. In manchen Systemen des Standes der Technik umfasst der Treiber bereits einen Sensor, der dazu eingerichtet ist, den Verlauf des elektrischen Stroms durch das Heizelement und/oder den zeitlichen Verlauf der Spannung an dem Heizelement in Reaktion auf das Signal zu messen. Häufig wird dieser bereits vorhandene Sensor zu Diagnosezwecken eingesetzt, beispielsweise auch um einen Kurzschluss zu erkennen. Die erfindungsgemäße Vorrichtung kann diesen bereits vorhandenen Sensor verwenden, wodurch auch das Bereitstellen eines separaten Sensors entfällt, was weiter die Kosten der Vorrichtung reduziert.In this way, the seat occupancy is detected by the current signal used for the normal operation of the seat heater. Additional signal generators and circuits for combining the heating signal and the measuring signal are not required, thus providing a less expensive solution than the systems known in the prior art. At the same time can be dispensed with existing dedicated sensors for seat occupancy detection. In some prior art systems, the driver already includes a sensor configured to measure the course of the electrical current through the heating element and / or the time course of the voltage across the heating element in response to the signal. Often this existing sensor is used for diagnostic purposes, for example, to detect a short circuit. The device according to the invention can use this already existing sensor, which also eliminates the provision of a separate sensor, which further reduces the cost of the device.

Ein Heizelement kann eine vollständige Heizmatte oder nur ein Teil davon sein.A heating element may be a complete heating mat or only part of it.

Die Messung von elektrischen Strömen und Spannungen an der Heizmatte kann die Messung der Phasenlage beider zueinander umfassen. Dies wird manchmal auch als Messung des komplexen Widerstandes des Heizelements beschrieben.The measurement of electrical currents and voltages on the heating mat can include the measurement of the phase relationship of both. This is sometimes described as a measurement of the complex resistance of the heating element.

In einer Weiterbildung durch das Signal für eine vorbestimmte Zeit eine konstante Spannung an das Heizelement angelegt. Es kann also ein Rechteckimpuls an das Heizelement gegeben werden und die Reaktion beobachtet werden, wodurch auf den komplexen Widerstand rückgeschlossen wird. Dieser wiederum gibt Aufschluss auf die Belegung der Sitzmatte.In a further development, a constant voltage is applied to the heating element for a predetermined time by the signal. So it can be given a rectangular pulse to the heating element and the reaction can be observed, which is concluded on the complex resistance. This in turn provides information on the occupancy of the seat mat.

In einer Variante kann das Signal eine gepulste Spannung oder eine Rechteckspannung sein.In a variant, the signal may be a pulsed voltage or a square-wave voltage.

In einer bevorzugten Weiterbildung ist die Verarbeitungseinheit weiter dazu eingerichtet, anhand des Signals und des Verlaufs des Stroms und/oder der Spannung verschiedene den Sitz belegende Personen zu erkennen.In a preferred embodiment, the processing unit is further configured to recognize various persons occupying the seat based on the signal and the course of the current and / or the voltage.

Ferner kann die Vorrichtung umfassen: Einen Sensor, der dazu eingerichtet ist, die Temperatur des Sitzes, insbesondere der Sitzfläche zu erfassen; Und wobei die Verarbeitungseinheit ferner dazu eingerichtet ist, die Belegung des Sitzes anhand der Temperatur oder der Temperaturänderung des Sitzes zu erkennen. Dabei kann insbesondere die Temperaturänderung mit einer erwarteten Temperaturänderung verglichen werden, die bei einem unbelegten Sitz erwartet würde. Diese erwartete Temperaturänderung kann voreingestellt sein oder aus einer vorherigen Referenzmessung bestimmt werden. Liegt beispielsweise die Temperaturänderung (und damit die Temperatur) des Sitzes unterhalb einer erwarteten Temperaturänderung, so kann darauf rückgeschlossen werden, dass der Sitz belegt ist. Generell kann davon ausgegangen werden, dass die Erwärmung einer den Sitz belegenden Person die Erwärmung des Sitzes und damit des Sitzsensors verzögert. Hierbei kann auch die Umgebungstemperatur berücksichtigt werden. Dies stellt eine ergänzende Erkennungsmethode dar, die das Ergebnis der Sitzbelegungserkennung anhand des Signals bestätigen kann. Diese Belegungserkennung kann auch bei abgeschalteter Sitzheizung durchgeführt werden. In manchen Systemen des Standes der Technik umfasst eine Sitzheizung bereits einen Temperatursensor, der für die Zwecke der erfindungsgemäßen Vorrichtung verwendet werden kann. Hierdurch können die Kosten für einen separaten Temperatursensor vermieden werden.Furthermore, the device may comprise: a sensor which is adapted to detect the temperature of the seat, in particular the seat surface; And wherein the processing unit is further adapted to detect the occupancy of the seat based on the temperature or the temperature change of the seat. In particular, the temperature change can be compared with an expected temperature change that would be expected in the case of a vacant seat. This expected temperature change may be preset or determined from a previous reference measurement. For example, is the temperature change (and thus the temperature) of the seat below an expected Temperature change, so it can be concluded that the seat is occupied. In general, it can be assumed that the heating of a person occupying the seat delays the heating of the seat and thus of the seat sensor. Here, the ambient temperature can be considered. This is a supplementary detection method that can confirm the result of seat occupancy detection from the signal. This occupancy detection can also be performed when the seat heating is switched off. In some prior art systems, a seat heater already includes a temperature sensor that may be used for the purposes of the device of the invention. As a result, the cost of a separate temperature sensor can be avoided.

KURZE BESCHREIBUNG DER ZEICHNUNGBRIEF DESCRIPTION OF THE DRAWING

1 zeigt schematisch eine Vorrichtung gemäß einem Ausführungsbeispiel. 1 schematically shows a device according to an embodiment.

DETAILLIERTE BESCHREIBUNG DES AUSFÜHRUNGSBEISPIELSDETAILED DESCRIPTION OF THE EMBODIMENT

1 zeigt schematisch eine Vorrichtung gemäß einem Ausführungsbeispiel. Ein Sitz 1 umfasst zwei Heizmatten 2a und 2b in der Sitzfläche beziehungsweise Lehne. Beide Sitzmatten 2a und 2b sind mit dem Treiber 3 und dem in diesem integrierten Sensor verbunden. Der Treiber und Sensor 3 sind wiederum mit der Verarbeitungseinheit 4 verbunden. 1 schematically shows a device according to an embodiment. A seat 1 includes two heating mats 2a and 2 B in the seat or backrest. Both seat mats 2a and 2 B are with the driver 3 and connected to this integrated sensor. The driver and sensor 3 are in turn with the processing unit 4 connected.

Im Betrieb gibt der Treiber und Sensor 3 eine gepulste Spannung auf die Sitzmatten 2a und 2b, wodurch die Sitzmatten derart erwärmt werden, dass sie für eine Person die Funktion der Sitzheizung erfüllen. Wenn eine Person den Sitz belegt, ändert die Person den komplexen Widerstand der Sitzmatten 2a und 2b, insbesondere dadurch, dass die Kapazität der Sitzmatten verändert wird. Diese Änderung des komplexen Widerstandes gegenüber dem Widerstand bei einem nicht belegten Sitz wird durch den Sensor 3 erfasst. Dieser misst den zeitlichen Verlauf von Strom und Spannung an den Sitzmatten in Antwort auf die angelegte gepulste Spannung. Diese Messungen werden an die Verarbeitungseinheit 4 weitergegeben, die daraus den komplexen Widerstand errechnet. Anhand vorher gespeicherter Widerstände für bestimmte Situationen, wie belegt/nicht-belegt, oder vorher aufgezeichnete Widerstände für bestimmte Personen, kann auf die Belegung des Sitzes rückgeschlossen werden und gegebenenfalls durch welche Person der Sitz belegt ist.In operation, the driver and sensor gives 3 a pulsed tension on the seat mats 2a and 2 B whereby the seat mats are heated so that they fulfill the function of the seat heating for a person. When a person occupies the seat, the person changes the complex resistance of the seat mats 2a and 2 B in particular in that the capacity of the seat mats is changed. This change in the complex resistance to resistance in an unoccupied seat is caused by the sensor 3 detected. This measures the time course of current and voltage on the seat mats in response to the applied pulsed voltage. These measurements are sent to the processing unit 4 passed on, which calculates the complex resistance. On the basis of previously stored resistors for certain situations, such as occupied / unoccupied, or previously recorded resistances for certain persons, the occupancy of the seat can be deduced and, if appropriate, by which person the seat is occupied.

Ein Temperatursensor (nicht gezeigt) kann durch eine Temperaturmessung und der Abweichung zwischen einer erwarteten Temperatur für einen belegten oder nicht belegten Sitz und der gemessenen Temperatur bestimmen, ob der Sitz belegt ist. Diese Erkenntnis kann verwendet werden, um die Bestimmung der Sitzbelegung aufgrund des Signals zu bestätigen. Die Temperaturmessung und Belegungserkennung kann sowohl bei eingeschalteter Sitzheizung sowie bei Deaktivierter Sitzheizung ausgeführt werden.A temperature sensor (not shown) may determine whether the seat is occupied by a temperature measurement and the deviation between an expected occupied or unoccupied seat temperature and the measured temperature. This finding can be used to confirm the determination of seat occupancy based on the signal. The temperature measurement and occupancy detection can be carried out both when the seat heating is switched on and when the seat heating is deactivated.

ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION

Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Zitierte PatentliteraturCited patent literature

  • DE 102008022981 A1 [0003] DE 102008022981 A1 [0003]

Claims (5)

Vorrichtung zum Erkennen einer Sitzbelegung mithilfe einer Sitzheizung für ein Kraftfahrzeug, umfassend: Ein Heizelement, das in einem Sitz eines Kraftfahrzeugs angeordnet ist; einen Treiber; wobei der Treiber mit dem Heizelement gekoppelt ist und an das Heizelement ein Signal, insbesondere ein zeitlich veränderliches Signal, ausgibt; wobei das Signal das Heizelement derart mit Energie versorgt, dass das Heizelement den Sitz oder Teile davon entsprechend der Funktion einer Sitzheizung erwärmt; einen Sensor; wobei der Sensor mit dem Heizelement gekoppelt ist und dazu eingerichtet ist, den Verlauf des elektrischen Stroms durch das Heizelement und/oder den zeitlichen Verlauf der Spannung an dem Heizelement in Reaktion auf das Signal zu messen; eine Verarbeitungseinheit; wobei die Verarbeitungseinheit dazu eingerichtet ist, anhand des Signals und des Verlaufs des Stroms und/oder der Spannung die Belegung des Sitzes durch eine Person zu erkennen.Device for detecting a seat occupancy by means of a seat heater for a motor vehicle, comprising: A heating element disposed in a seat of a motor vehicle; a driver; wherein the driver is coupled to the heating element and outputs to the heating element a signal, in particular a time-varying signal; the signal energizing the heating element such that the heating element heats the seat or portions thereof in accordance with the seat heater function; a sensor; wherein the sensor is coupled to the heating element and is adapted to measure the course of the electrical current through the heating element and / or the time profile of the voltage across the heating element in response to the signal; a processing unit; wherein the processing unit is adapted to recognize the occupancy of the seat by a person on the basis of the signal and the course of the current and / or the voltage. Vorrichtung nach Anspruch 1, wobei durch das Signal für eine vorbestimmte Zeit eine konstante Spannung an das Heizelement angelegt wird.Apparatus according to claim 1, wherein a constant voltage is applied to the heating element for a predetermined time by the signal. Vorrichtung nach Anspruch 1, wobei das Signal eine gepulste Spannung oder eine Rechteckspannung ist.The device of claim 1, wherein the signal is a pulsed voltage or a square wave voltage. Vorrichtung nach einem der vorhergehenden Ansprüche, wobei die Verarbeitungseinheit weiter dazu eingerichtet ist, anhand des Signals und des Verlaufs des Stroms und/oder der Spannung verschiedene den Sitz belegende Personen zu erkennen.Device according to one of the preceding claims, wherein the processing unit is further adapted to detect on the basis of the signal and the course of the current and / or the voltage different people occupying the seat. Vorrichtung nach einem der vorhergehenden Ansprüche, ferner umfassend: Einen Sensor, der dazu eingerichtet ist, die Temperatur des Sitzes, insbesondere der Sitzfläche zu erfassen; Und wobei die Verarbeitungseinheit ferner dazu eingerichtet ist, die Belegung des Sitzes anhand der Temperatur oder Temperaturänderung des Sitzes zu erkennen, insbesondere durch einen Vergleich mit einer erwarteten Temperaturänderung bei einem unbelegten Sitz.Device according to one of the preceding claims, further comprising: A sensor adapted to sense the temperature of the seat, in particular the seat; And wherein the processing unit is further adapted to detect the occupancy of the seat based on the temperature or temperature change of the seat, in particular by a comparison with an expected temperature change in an unoccupied seat.
DE201210223342 2012-12-17 2012-12-17 Device for recognizing occupancy of seat by person using seat heater in motor car, has processing unit recognizing seat occupancy based on characteristics of electric current and voltage through and at heating element Withdrawn DE102012223342A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
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DE102022129625A1 (en) 2022-11-09 2024-05-16 Bayerische Motoren Werke Aktiengesellschaft Control unit and method for detecting seat occupancy in a vehicle by temperature comparison

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