DE4338285A1 - Electronic device for controlling seat heating - Google Patents
Electronic device for controlling seat heatingInfo
- Publication number
- DE4338285A1 DE4338285A1 DE19934338285 DE4338285A DE4338285A1 DE 4338285 A1 DE4338285 A1 DE 4338285A1 DE 19934338285 DE19934338285 DE 19934338285 DE 4338285 A DE4338285 A DE 4338285A DE 4338285 A1 DE4338285 A1 DE 4338285A1
- Authority
- DE
- Germany
- Prior art keywords
- electronic device
- connection
- heating element
- seat
- transistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/40—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight
- G01G19/413—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means
- G01G19/414—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only
- G01G19/4142—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups with provisions for indicating, recording, or computing price or other quantities dependent on the weight using electromechanical or electronic computing means using electronic computing means only for controlling activation of safety devices, e.g. airbag systems
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/62—Accessories for chairs
- A47C7/72—Adaptations for incorporating lamps, radio sets, bars, telephones, ventilation, heating or cooling arrangements or the like
- A47C7/74—Adaptations for incorporating lamps, radio sets, bars, telephones, ventilation, heating or cooling arrangements or the like for ventilation, heating or cooling
- A47C7/748—Adaptations for incorporating lamps, radio sets, bars, telephones, ventilation, heating or cooling arrangements or the like for ventilation, heating or cooling for heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
- B60H1/00742—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models by detection of the vehicle occupants' presence; by detection of conditions relating to the body of occupants, e.g. using radiant heat detectors
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- 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
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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
- B60R21/01532—Passenger detection systems using field detection presence sensors using electric or capacitive field sensors
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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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Transportation (AREA)
- Thermal Sciences (AREA)
- Air Bags (AREA)
- Control Of Resistance Heating (AREA)
Abstract
Description
Die Erfindung betrifft ein elektronisches Gerät für die Ansteuerung einer Sitzheizung nach dem Oberbegriff des Anspruchs 1.The invention relates to an electronic device for control a seat heater according to the preamble of claim 1.
Zwecks Erhöhung des Fahrzeugkomforts ist es bekannt, einen Fahrzeug sitz beheizbar auszugestalten. Er verfügt dazu über eine in die Sitzfläche integrierte Heizwicklung, die gegebenenfalls unter Zwischenschaltung eines Schalters nach Bedarf oder automatisch, in Abhängigkeit von der Temperatur, mit der Batterie des Fahrzeugs verbindbar ist. Der Minuspol der Heizwicklung liegt an Massepoten tial. Der Pluspol liegt in Reihe mit einem Temperaturregler. Bei einigen Fahrzeugen ist der Pluspol zusätzlich mit einem Ein-Aus-Schalter versehen.In order to increase vehicle comfort, it is known to have a vehicle heat seat design. He has one in the Seat integrated heating coil, which if necessary under Interposition of a switch as required or automatically, in Dependence on the temperature with the battery of the vehicle is connectable. The negative pole of the heating winding is due to earth potentials tial. The positive pole is in series with a temperature controller. At in some vehicles, the plus pole is additionally with a Provide on-off switch.
Insbesondere in Verbindung mit Rückhaltemitteln für Fahrzeug insassen, wie zum Beispiel Gurten und/oder Airbag-Systemen, sind weiter Mittel zur Feststellung der Anwesenheit eines Fahrzeug insassen bekannt. Derartige Einrichtungen sind von besonderer Bedeutung bei mit sogenannten passiven Rückhaltemitteln, wie bei spielsweise einem Airbag-System, ausgestatteten Fahrzeugen, die im Gefahrenfall ohne menschliches Zutun aktiviert werden. Eine Akti vierung ist auch im Gefahrenfall nämlich nur dann notwendig, wenn der betreffende Fahrzeugsitz tatsächlich von einem Fahrzeuginsassen eingenommen ist. Ein überflüssiges Auslösen eines beispielsweise für einen Beifahrer vorgesehenen Airbag-Systems bei leerem Beifahrersitz würde zu erheblichen Kosten im Zusammenhang mit der Wiederinstand setzung der Airbag-Bauelemente führen.Especially in connection with restraint devices for vehicles occupants, such as belts and / or airbag systems further means for determining the presence of a vehicle inmates known. Such facilities are special Significance in the case of so-called passive restraint devices, such as for example, an airbag system, equipped vehicles in the Danger can be activated without human intervention. An act In the event of danger, crossing is only necessary if the vehicle seat in question is actually by a vehicle occupant is ingested. An unnecessary triggering one for example an airbag system provided for the front passenger when the front passenger seat is empty would be at a significant cost related to the repair airbag components.
Auch bei einem belegten Fahrzeugsitz können Mittel zur Sitzbele gungserkennung zweckmäßig zur Feststellung dienen, ob der jeweilige Fahrzeuginsasse eine systemgerechte Sitzposition innehat oder nicht. Diese Feststellung kann im Falle eines Unfalls als Entscheidungs kriterium dafür herangezogen werden, ob ein Airbag-System überhaupt oder gegebenenfalls erst etwas später ausgelöst wird, um eine mög liche Verletzungsgefahr des Fahrzeuginsassen infolge einer falschen Sitzposition zu verhindern oder zumindest zu reduzieren. Schon im Vorfeld einer Unfallsituation könnte jedoch eine falsche Sitz position über geeignete Anzeigemittel, wie beispielsweise eine Warn lampe oder einen Signalgenerator angezeigt werden.Even with an occupied vehicle seat, means for seat covers can be used supply detection useful to determine whether the particular Vehicle occupants hold a system-appropriate seating position or not. This finding can be used as a decision in the event of an accident criterion for whether an airbag system at all or, if necessary, only triggered a little later to make a possible risk of injury to the vehicle occupant as a result of an incorrect To prevent or at least reduce the seating position. Already in However, leading up to an accident situation could be an incorrect seat position via suitable display means, such as a warning lamp or a signal generator can be displayed.
Aus US-A1-3 863 209 ist ein Fahrzeugsitz bekannt, der einen in der Sitzfläche angeordneten lastabhängigen Schalter aufweist. Bei Belegung des Sitzes mit einem Fahrzeuginsassen ändert dieser Schalter seinen Schaltzustand und kann beispielsweise einen Strom kreis schließen. Bei diesem Schalter handelt es sich um ein von einer Sitzheizung unabhängiges Bauelement.From US-A1-3 863 209 a vehicle seat is known which one in the Seat arranged arranged load-dependent switch. At Occupancy of the seat with a vehicle occupant changes this Switch its switching state and can, for example, a current close circle. This switch is one of a seat heating independent component.
Um Personen im Schließbereich von Türen zu erkennen, ist eine kapa zitive Messung mit Oszillatoren aus DE-OS 30 44 789 bekannt. Die Person begibt sich zwischen die Kapazitätselektroden eines Luftkon densators und erhöht dadurch die Kapazität des Oszillatorkondensa tors. Die Oszillatorfrequenz nimmt ab.To recognize people in the closing area of doors, there is a kapa zitive measurement with oscillators from DE-OS 30 44 789 known. The Person moves between the capacitance electrodes of an air con capacitor, thereby increasing the capacitance of the oscillator capacitor tors. The oscillator frequency decreases.
Aus US-A1-4 885 566 ist weiter eine Einrichtung bei einem Fahrzeug bekannt, die es ermöglicht, das Anlegen eines Sicherheitsgurts zu überprüfen. Diese Einrichtung sieht eine Sitzelektrode und eine bzw. zwei Gurtelektroden vor. Ein belegter Sitz wird durch Kapazitäts erhöhung zwischen Sitzelektrode und Gurtelektrode bzw. Kapazitäts erhöhung zwischen den beiden Gurtelektroden erkannt. Die Schwin gungsfrequenz des Schwingkreises ist von der Sitzbelegung durch einen Fahrzeuginsassen abhängig. Auch bei dieser bekannten Einrichtung ist die in dem Fahrzeugsitz angeordnete Elektrode kein Bestandteil einer Sitzheizung.From US-A1-4 885 566 is a device in a vehicle known, which makes it possible to wear a seat belt check. This device sees a seat electrode and a or two belt electrodes in front. A seat is occupied by capacity increase between seat electrode and belt electrode or capacity increase detected between the two belt electrodes. The swine frequency of the resonant circuit is determined by the seat occupancy dependent on a vehicle occupant. Even with this well-known The electrode arranged in the vehicle seat is not a device Part of a seat heater.
Aus DE 36 35 644 C2 ist eine Sitzelektrode bekannt, die mit der Fahrzeugkarosserie als Gegenelektrode (- Masse) einen Kondensator darstellt. Der Kondensator erhöht durch einen Beifahrer seine Kapazität. Der Oszillator erniedrigt bei belegtem Sitz seine Frequenz. Es ist ein Zähler-Speicher vorgesehen, der während einer festen Zeit von 0.1 sek die Oszillatorimpulse zählt und über den Speicher seriell an den Mikrocomputer weitergibt. Es wird nicht die absolute Kapazität, sondern deren momentane Änderung ausgewertet.From DE 36 35 644 C2 a seat electrode is known, which with the Vehicle body as a counter electrode (- ground) a capacitor represents. The capacitor increases its through a passenger Capacity. When the seat is occupied, the oscillator lowers its Frequency. A counter memory is provided, which during a the oscillator pulses counts for a fixed time of 0.1 sec Passes memory serially to the microcomputer. It won't absolute capacity, but their current change is evaluated.
Aus DE 41 10 702 A1 ist weiter ein Fahrzeugsitz mit Sitzheizung bekannt, bei dem die Sitzheizung in Doppelfunktion als Sensor für eine Sitzbelegungserkennungsschaltung dient.From DE 41 10 702 A1 there is also a vehicle seat with seat heating known in which the seat heating in double function as a sensor for a seat occupancy detection circuit is used.
Das elektronische Gerät mit den kennzeichnenden Merkmalen des Anspruchs 1 hat demgegenüber zahlreiche Vorteile. Dadurch, daß zumindest Teile einer bereits vorhandenen Sitzheizung als Mittel zur Erkennung der Sitzbelegung dienen, läßt sich ein besonders einfacher und damit auch preiswerter konstruktiver Aufbau eines Fahrzeugsitzes realisieren. Das elektronisches Gerät bietet weiterhin den Vorteil, daß das Heizelement und die das Heizelement mit dem elektronischen Gerät, bzw. der Stromquelle verbindende Relaisschaltung auf Fehler überwacht werden können; insbesondere ist auch eine Erfassung der Anzugszeit des Relais möglich. Das Gerät ermöglicht weiterhin die Zuschaltung der Sitzheizung und deren Betrieb über eine beliebige Zeitdauer sowie die Frequenzmessung eines Oszillators, dessen Schwingfrequenz von dem Heizelement beeinflußt wird. Dadurch ist auf einfache Weise die Feststellung möglich, ob der Fahrzeugsitz von einem Fahrzeuginsassen besetzt ist oder nicht. Alle diese viel fältigen Steuerungsfunktionen werden mit nur einer einzigen Ver bindungsleitung ermöglicht, die das elektronische Gerät mit einem zentralen Steuergerät (Airbag-Steuergerät) verbindet.The electronic device with the distinctive features of the In contrast, claim 1 has numerous advantages. As a result of that at least parts of an existing seat heating as a means of Serve detection of the seat occupancy can be a particularly simple and thus also the inexpensive construction of a vehicle seat realize. The electronic device also offers the advantage that the heating element and the heating element with the electronic Device or the relay circuit connecting the power source for errors can be monitored; in particular is also a recording of the Pick-up time of the relay possible. The device still enables Switching on the seat heating and its operation via any Duration and the frequency measurement of an oscillator, the Vibration frequency is influenced by the heating element. This is on easy way to determine whether the vehicle seat from is occupied by a vehicle occupant or not. All this a lot control functions are accomplished with just a single ver connection line allows the electronic device with a central control unit (airbag control unit) connects.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und in der nachfolgenden Beschreibung näher erläutert. Fig. 1 zeigt dabei das Blockschaltbild einer Anlage, die das Heizelement der Sitzheizung, ein elektronisches Gerät, einen Temperaturregler und ein zentrales Steuergerät umfaßt; Fig. 2 zeigt den Stromlaufplan eines ersten Ausführungsbeispiels des elektronischen Geräts; Fig. 3 zeigt in Gestalt eines Blockschaltbildes ein zweites Ausführungs beispiel und Fig. 4 zeigt den Stromlaufplan des zweiten Aus führungsbeispiels eines elektronischen Gerätes.Embodiments of the invention are shown in the drawing and explained in more detail in the following description. Fig. 1 shows the block diagram of a system that includes the heating element of the seat heater, an electronic device, a temperature controller and a central control unit; Fig. 2 shows the circuit diagram of a first embodiment of the electronic device; Fig. 3 shows a second embodiment in the form of a block diagram and Fig. 4 shows the circuit diagram of the second exemplary embodiment from an electronic device.
In Fig. 1 ist mit Bezugsziffer 1 das Heizelement einer elektrischen Sitzheizung bezeichnet, das über von einem elektronischen Gerät 4 steuerbare Kontakte, insbesondere Relaiskontakte 3, bei belegtem Sitz an Spannung liegt. Das Zu- und Abschalten des Heizelements 1 erfolgt auf den Steuerbefehl eines mit dem elektronischen Gerät 4 verbundenen Temperaturreglers 2. Das Heizelement 1 liegt, vorzugs weise mit einem Abgriff 5, an einem Anschluß des elektronischen Gerätes 4. Das elektronische Gerät 4 ist weiterhin über eine Leitung 9 mit dem Airbagsteuergerät 6 verbunden. Bei Beginn einer durch den Temperaturregler 2 angeforderten Heizphase schaltet das elektro nische Gerät 4 zwecks Ermittlung einer Sitzbelegung kurzzeitig über die Kontakte 3 das Heizelement ab und mißt die Frequenz eines Oszillators, dessen Schwingungsfrequenz von dem Heizelement 1 beeinflußt ist. Ein wiederholtes Zuschalten des Heizelements 1 vermittels der Kontakte 3 erfolgt nur, wenn die Messung ergeben hat, daß der Sitz belegt ist.In Fig. 1, reference numeral 1 denotes the heating element of an electric seat heater, which is connected to voltage via contacts 4 that can be controlled by an electronic device, in particular relay contacts 3 , when the seat is occupied. The heating element 1 is switched on and off in response to the control command of a temperature controller 2 connected to the electronic device 4 . The heating element 1 is, preferably, with a tap 5 , at a connection of the electronic device 4th The electronic device 4 is also connected to the airbag control device 6 via a line 9 . At the beginning of a heating phase requested by the temperature controller 2 , the electronic device 4 switches temporarily to determine a seat occupancy via the contacts 3, the heating element and measures the frequency of an oscillator whose oscillation frequency is influenced by the heating element 1 . A repeated connection of the heating element 1 by means of the contacts 3 takes place only if the measurement has shown that the seat is occupied.
In Fig. 2 ist der Stromlaufplan eines ersten Ausführungsbeispiels des elektronischen Geräts dargestellt. Mit Bezugsziffer 1 ist ein Heizelement für die Sitzheizung eines Fahrzeugs bezeichnet, das in zwei Teilelemente 1a, 1b unterteilt ist. Ein Endanschluß des Teil elements 1b ist mit dem Masseanschluß verbunden, während der andere Endanschluß des Teilelements 1b an einen ersten Relaiskontakt Rel1 geführt ist, dessen anderer Anschluß mit dem ersten Endstück des zweiten Teilelements 1a verbunden ist. Der zweite Anschluß des Teilelements 1a schließlich ist einerseits an einen ersten Relais kontakt Rel2 gelegt, dessen anderer Anschluß an dem positiven Betriebsspannungsanschluß UB liegt. Andererseits ist der erste Relaiskontakt von Rel2 über einen Widerstand R17 mit dem invertie renden Eingangsanschluß eines Schaltkreises (Operationsverstärker) IC1/2 verbunden. Der invertierende Eingangsanschluß liegt weiterhin über einen Kondensator C4 und eine Diode D6 an Masse und anderer seits über eine Diode D5 an der Betriebsspannung U1. Weiterhin ist der invertierende Eingangsanschluß über den Widerstand R14 mit dem Ausgangsanschluß des Schaltkreises IC1/2 verbunden. Der nicht invertierende Eingangsanschluß dieses Schaltkreises ist seinerseits über einen Widerstand R16 mit dem Masseanschluß, über einen Wider stand R15 mit dem Betriebsspannungsanschluß U1 und schließlich über einen weiteren Widerstand R13 mit dem Ausgangsanschluß des Schalt kreises IC1/2 verbunden. Weiterhin liegt der Ausgangsanschluß des Schaltkreises IC1/2 über einen Widerstand R12 an der Betriebs spannung U1. Weiterhin ist der Ausgangsanschluß des Schaltkreises IC1/2 über einen Widerstand R9 mit dem Gate-Anschluß eines Transistors T1 verbunden, dessen Source-Anschluß an Masse liegt und dessen Drain-Anschluß an die Verbindungsstelle von zwei Widerständen R2, R3 geführt ist. Diese Verbindungsstelle liegt andererseits über eine Zenerdiode D1 an Masse. Der andere Anschluß des Widerstands R2 liegt über einen weiteren Widerstand R1 an der Betriebsspannung U1 und andererseits an einem Anschluß des Airbag-Steuergerätes 6. Der andere Anschluß des Widerstands R3 führt zu dem invertierenden Eingangsanschluß eines Schaltkreises IC1/1, der weiterhin über einen Kondensator C1 an Masse liegt. Der nichtinvertierende Eingangsanschluß des Schaltkreises IC1/1 ist einerseits über einen Widerstand R4 mit dem Masseanschluß, andererseits über den Wider stand R5 mit dem Betriebsspannungsanschluß U1 und schließlich über einen Widerstand R6 mit dem Ausgangsanschluß des Schaltkreises IC1/1 verbunden. Dieser Ausgangsanschluß ist ebenfalls über einen Widerstand R7 mit dem Betriebsspannungsanschluß U1 verbunden. Weiterhin führt der Ausgangsanschluß des Schaltkreises IC1/1 an den Gate-Anschluß eines zweiten Transistors T2, dessen Source-Anschluß mit dem Drain-Anschluß eines dritten Transistors T3 verbunden ist. Der Source-Anschluß dieses dritten Transistors T3 ist mit Masse verbunden, während sein Gate-Anschluß einerseits über eine Zener diode D7 an Masse liegt und andererseits über einen Widerstand R11 mit einem Anschluß eines Temperaturreglers 2 verbunden ist. Der Anschluß des Temperaturreglers 2 liegt weiterhin über einen Wider stand R10 an Masse. Im Drain-Kreis des Transistors T2 liegt eine Wicklung eines Relais Rel, der eine Diode D2 parallel geschaltet ist. Der dem Transistor T2 fernliegende Anschluß der Relaiswicklung liegt über eine Diode 3 an der positiven Betriebsspannungsquelle UB, die wiederum über einen Kondensator C2 an Masse gelegt ist. Der Verbindungspunkt zwischen der Diode D3 und der Relaiswicklung liegt über einen Widerstand R8 an dem Betriebsspannungsanschluß U1, der wiederum über eine Zenerdiode D4 einerseits und einen Kondensator C3 andererseits mit dem Masseanschluß verbunden ist.In FIG. 2, the circuit diagram of a first embodiment of the electronic device is shown. Reference number 1 denotes a heating element for the seat heating of a vehicle, which is divided into two sub-elements 1 a, 1 b. One end connection of the partial elements 1 b is connected to the ground connection, while the other end connection of the partial element 1 b is guided to a first relay contact Rel1, the other connection of which is connected to the first end piece of the second partial element 1 a. Finally, the second connection of the sub-element 1 a is on the one hand connected to a first relay contact Rel2, the other connection of which is connected to the positive operating voltage connection UB. On the other hand, the first relay contact of Rel2 is connected via a resistor R17 to the inverting input terminal of a circuit (operational amplifier) IC1 / 2. The inverting input terminal is also connected to ground via a capacitor C4 and a diode D6 and, on the other hand, to the operating voltage U1 via a diode D5. Furthermore, the inverting input terminal is connected to the output terminal of the circuit IC1 / 2 via the resistor R14. The non-inverting input connection of this circuit is in turn connected via a resistor R16 to the ground connection, via a resistor R15 to the operating voltage connection U1 and finally via a further resistor R13 to the output connection of the circuit IC1 / 2. Furthermore, the output terminal of the circuit IC1 / 2 is connected to the operating voltage U1 via a resistor R12. Furthermore, the output terminal of the circuit IC1 / 2 is connected via a resistor R9 to the gate terminal of a transistor T1, the source terminal of which is connected to ground and the drain terminal of which is led to the junction of two resistors R2, R3. On the other hand, this connection point is connected to ground via a Zener diode D1. The other connection of the resistor R2 is connected to the operating voltage U1 via a further resistor R1 and on the other hand to a connection of the airbag control unit 6 . The other terminal of resistor R3 leads to the inverting input terminal of a circuit IC1 / 1, which is still connected to ground via a capacitor C1. The non-inverting input connection of the circuit IC1 / 1 is connected on the one hand via a resistor R4 to the ground connection, on the other hand via the resistor R5 to the operating voltage connection U1 and finally via a resistor R6 to the output connection of the circuit IC1 / 1. This output connection is also connected via a resistor R7 to the operating voltage connection U1. Furthermore, the output terminal of the circuit IC1 / 1 leads to the gate terminal of a second transistor T2, the source terminal of which is connected to the drain terminal of a third transistor T3. The source connection of this third transistor T3 is connected to ground, while its gate connection is connected to ground on the one hand via a Zener diode D7 and on the other hand is connected to a connection of a temperature controller 2 via a resistor R11. The connection of the temperature controller 2 is still an opposing R10 to ground. In the drain circuit of transistor T2 is a winding of a relay Rel, which is connected to a diode D2 in parallel. The connection of the relay winding remote from the transistor T2 is connected via a diode 3 to the positive operating voltage source UB, which in turn is connected to ground via a capacitor C2. The connection point between the diode D3 and the relay winding is connected via a resistor R8 to the operating voltage connection U1, which in turn is connected to the ground connection via a Zener diode D4 on the one hand and a capacitor C3 on the other hand.
Sofern ein Heizleistungsbedarf beispielsweise durch einen mit dem Temperaturregler 2 in Wirkverbindung stehenden Temperatursensor festgestellt wird, steuert der Temperaturregler 2 über den Wider stand R11 den Transistor T3 in den leitenden Zustand. Die Heizung kann nun für eine beliebige Zeitdauer in Betrieb gesetzt werden wenn auch das Steuergerät 6 einen entsprechenden Ansteuerimpuls ausgibt, der über den Schaltkreis IC1/1 auch den Transistor T2 in den leitenden Zustand versetzt, der daraufhin die Wicklung des Relais Rel aktiviert und die Relaiskontakte Rel1 und Rel2 schließt. Dadurch werden beide Teilelemente 1a, 1b des Heizelementes 1 an die Betriebsspannung gelegt und von Strom durchflossen. Der Schaltkreis IC1/2 mit Peripheriebeschaltung stellt einen Oszillator dar, dessen Schwingungsfrequenz von einer Kapazität beeinflußbar ist, die aus mindestens einem Teilelement 1a, 1b des Heizelements 1 einerseits und beispielsweise der Fahrzeugmasse andererseits besteht. Diese Kapazität ändert sich beispielsweise dadurch, daß der Fahrzeugsitz von einem Fahrzeugpassagier besetzt wird. Durch kurzzeitiges Auf trennen des Heiz-Kreises mittels der Relaiskontakte Rel1 und Rel2 kann eine vom Heizvorgang ungestörte Messung der Sitzkapazität erfolgen, wodurch feststellbar ist, ob ein Sitz besetzt ist oder nicht. Falls der Sitz nicht besetzt ist, besteht keine Notwendigkeit für die Heizung des Sitzes, so daß durch Nichtansteuerung des Transistors T2 ein weiterer Heizvorgang unterbunden wird. Zugleich wird die Nichtbelegung des Sitzes auch von dem Airbag-Steuergerät 6 registriert. Diese Information wird dahingehend weiterverarbeitet, daß ein beispielsweise für die Beifahrerseite vorgesehener Airbag im Falle der Nichtbelegung des Sitzes nicht aktiviert wird. Zugleich dient diese Maßnahme auch einem verstärkten Sicherungsbedürfnis, da auch fehlerhafte Sitzpositionen feststellbar sind, die bei sorg fältiger Abwägung der Risiken vorzugsweise nicht zu der Auslösung eines Airbags führen sollten. If a heating power requirement is determined for example by an operatively connected with the temperature controller 2 temperature sensor, the temperature controller controls 2 via the reflection stand R11 to transistor T3 in the conductive state. The heater can now be put into operation for any period of time if the control unit 6 also outputs a corresponding control pulse, which also switches the transistor T2 into the conductive state via the circuit IC1 / 1, which then activates the winding of the relay Rel and the relay contacts Rel1 and Rel2 closes. As a result, both sub-elements 1 a, 1 b of the heating element 1 are connected to the operating voltage and current flows through them. The circuit IC1 / 2 with peripheral circuitry represents an oscillator whose oscillation frequency can be influenced by a capacitance consisting of at least one sub-element 1 a, 1 b of the heating element 1 on the one hand and, for example, the vehicle mass on the other. This capacity changes, for example, in that the vehicle seat is occupied by a vehicle passenger. By briefly opening the heating circuit by means of the relay contacts Rel1 and Rel2, the seat capacity can be measured undisturbed by the heating process, whereby it can be determined whether a seat is occupied or not. If the seat is not occupied, there is no need for heating the seat, so that a further heating process is prevented by not actuating the transistor T2. At the same time, the non-occupancy of the seat is also registered by the airbag control unit 6 . This information is further processed in such a way that an airbag provided for the passenger side, for example, is not activated if the seat is not occupied. At the same time, this measure also serves to increase the need for security, since it is also possible to detect incorrect sitting positions which, if the risks are carefully weighed up, should preferably not lead to the deployment of an airbag.
Diese Schaltung ermöglicht weiterhin, die Erfassung der Anzugszeit des Relais Rel und die Feststellung von Fehlern wie beispielsweise Kurzschlüssen oder Leitungsunterbrechungen im Heizkreis.This circuit also enables the acquisition of the tightening time of the relay Rel and the detection of errors such as Short circuits or open circuits in the heating circuit.
Ein weiteres Ausführungsbeispiel des elektronischen Geräts ist als Blockschaltbild in Fig. 3 und als Stromlaufplan in Fig. 4 dar gestellt. Bei dem Ausführungsbeispiel gemäß Fig. 4 ist der Steuer eingang 9 des elektronischen Gerätes 4 über einen Widerstand R3 mit dem Steueranschluß eines Transistors T2 verbunden, dessen Source-An schluß an Masse liegt und dessen Drain-Anschluß einerseits über einen Widerstand R4 an Betriebsspannung und andererseits an dem Steueranschluß eines zweiten Transistors T3 liegt. Der Steuer anschluß des Transistors T2 ist weiterhin über einen Kondensator C1 mit Masse verbunden. Der Steuereingang des elektronischen Gerätes 4 ist weiterhin über einen Widerstand R2 mit der Betriebsspannung und über eine Verbindungsleitung mit dem Ausgangsanschluß eines Oszillators 10 verbunden, der wiederum über einen Steuereingang 10′, wie auch in Fig. 3 dargestellt, zumindest mit einem Teil des Heizelementes 1, 1a, 1b verbunden ist. Im Lastkreis des Transistors T3 ist ein Relais Rel angeordnet, das Kontakte zur Verbindung des Heizelements 1 (Fig. 3) mit der Betriebsspannungsquelle steuert. Der Source-Anschluß des Transistors T3 ist mit Masse verbunden. Der Steueranschluß des Transistors T3 ist mit dem Drain-Anschluß eines weiteren Transistors T4 verbunden, dessen Source-Anschluß an Masse liegt. Der Steueranschluß des Transistors T4 ist mit dem Ausgangsanschluß eines Temperataurreglers 2 verbunden.Another embodiment of the electronic device is shown as a block diagram in Fig. 3 and as a circuit diagram in Fig. 4. In the embodiment according to FIG. 4, the control input 9 of the electronic device 4 is connected via a resistor R3 to the control terminal of a transistor T2, the source-to-circuit to ground and its drain terminal on the one hand via a resistor R4 to the operating voltage and on the other hand is at the control terminal of a second transistor T3. The control terminal of the transistor T2 is also connected to ground via a capacitor C1. The control input of the electronic device 4 is also connected via a resistor R2 to the operating voltage and via a connecting line to the output terminal of an oscillator 10 , which in turn is connected via a control input 10 ', as also shown in FIG. 3, to at least part of the heating element 1 , 1 a, 1 b is connected. A relay Rel is arranged in the load circuit of the transistor T3, which controls contacts for connecting the heating element 1 ( FIG. 3) to the operating voltage source. The source terminal of transistor T3 is connected to ground. The control terminal of transistor T3 is connected to the drain terminal of a further transistor T4, the source terminal of which is connected to ground. The control terminal of the transistor T4 is connected to the output terminal of a temperature regulator 2 .
Claims (5)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934338285 DE4338285A1 (en) | 1993-11-10 | 1993-11-10 | Electronic device for controlling seat heating |
| DE4498618T DE4498618D2 (en) | 1993-11-10 | 1994-10-27 | Electronic device for controlling seat heating |
| PCT/DE1994/001254 WO1995013204A1 (en) | 1993-11-10 | 1994-10-27 | Electronic device for controlling a seat-heating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19934338285 DE4338285A1 (en) | 1993-11-10 | 1993-11-10 | Electronic device for controlling seat heating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE4338285A1 true DE4338285A1 (en) | 1995-05-11 |
Family
ID=6502193
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE19934338285 Withdrawn DE4338285A1 (en) | 1993-11-10 | 1993-11-10 | Electronic device for controlling seat heating |
| DE4498618T Expired - Fee Related DE4498618D2 (en) | 1993-11-10 | 1994-10-27 | Electronic device for controlling seat heating |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE4498618T Expired - Fee Related DE4498618D2 (en) | 1993-11-10 | 1994-10-27 | Electronic device for controlling seat heating |
Country Status (2)
| Country | Link |
|---|---|
| DE (2) | DE4338285A1 (en) |
| WO (1) | WO1995013204A1 (en) |
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| EP0881132A1 (en) * | 1997-05-27 | 1998-12-02 | Volkswagen Aktiengesellschaft | Method and apparatus for seat occupancy recognition in a vehicle |
| EP0873903A3 (en) * | 1997-04-24 | 1999-03-03 | Volkswagen Aktiengesellschaft | Sheet pressure sensor device for detecting vehicle seat occupancy |
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| DE19852541C1 (en) * | 1998-11-05 | 2000-03-23 | Brose Fahrzeugteile | Method and device for identifying occupancy of a motor vehicle seat activates an electrical driving mechanism to trigger an adjustment device for disengaging if it identifies an unoccupied seat. |
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-
1993
- 1993-11-10 DE DE19934338285 patent/DE4338285A1/en not_active Withdrawn
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1994
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- 1994-10-27 DE DE4498618T patent/DE4498618D2/en not_active Expired - Fee Related
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| DE29500749U1 (en) * | 1995-01-18 | 1996-05-15 | Peters, Rolf, 47533 Kleve | Seat sensor and device with a seat sensor and an evaluation unit |
| DE19547333A1 (en) * | 1995-12-19 | 1997-06-26 | Telefunken Microelectron | Occupant protection system for vehicle used for conveying people |
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| DE10026656A1 (en) * | 2000-05-29 | 2001-12-13 | Siemens Ag | Climate conditioner for a motor vehicle seat has built in sensors and control unit for seat temperature elements |
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| DE102011005551A1 (en) | 2011-03-15 | 2012-09-20 | Takata-Petri Ag | Occupancy detection device for detecting an occupancy of a seat of a motor vehicle |
| US9452689B2 (en) | 2012-09-24 | 2016-09-27 | Bayerische Motoren Werke Aktiengesellschaft | Seat occupancy detection device |
| DE102012217140A1 (en) * | 2012-09-24 | 2014-06-12 | Bayerische Motoren Werke Aktiengesellschaft | Seat occupancy detection device |
| DE102012223342A1 (en) * | 2012-12-17 | 2014-07-03 | Bayerische Motoren Werke Aktiengesellschaft | 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 |
| US9561768B2 (en) | 2013-04-09 | 2017-02-07 | Iee International Electronics & Engineering S.A. | Capacitive sensing device |
| US9726775B2 (en) | 2013-04-09 | 2017-08-08 | Iee International Electronics & Engineering S.A. | Capacitive sensing device |
| WO2014166881A1 (en) * | 2013-04-09 | 2014-10-16 | Iee International Electronics & Engineering S.A. | Capacitive sensing device |
| LU92178B1 (en) * | 2013-04-09 | 2014-10-10 | Iee Sarl | Capacitive sensing device |
| US10075999B2 (en) | 2013-05-15 | 2018-09-11 | Gentherm Gmbh | Conductive heater having sensing capabilities |
| WO2018095569A1 (en) * | 2016-11-25 | 2018-05-31 | Audi Ag | Device for identifying a proper belt usage status of a seat belt |
| DE102018115214A1 (en) * | 2018-06-25 | 2020-01-02 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Electrical circuit, method for an electrical circuit and computer program |
| WO2020002322A2 (en) | 2018-06-25 | 2020-01-02 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Electrical circuit, method for an electrical circuit and computer program |
Also Published As
| Publication number | Publication date |
|---|---|
| DE4498618D2 (en) | 1996-11-14 |
| WO1995013204A1 (en) | 1995-05-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8143 | Withdrawn due to claiming internal priority |