• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    With increasing demands on transport capacities, security and logistics, systems for reliably detecting the occupancy of seats in means of transport, auditoriums, etc. are becoming increasingly important. Especially easy to retrofit into existing systems solutions are of great interest, the use of previously known standard solutions for technical reasons as well as a high installation costs. To remedy this situation, it is proposed according to the invention to detect the seating state of a seat by measuring the characteristic changes in the electromagnetic coupling between adjacent antennas in the presence of a proximal (human) body. From the relations between emitted and received radio waves can thus be determined easily and with minimal transmission power of the occupancy state of the seat reliably.
    公开号:AT511497A1
    申请号:T7962011
    申请日:2011-05-31
    公开日:2012-12-15
    发明作者:Hermann Dipl Ing Sterner；Matthias Dipl Ing Haselberger；Ingmar Ing Bihlo
    申请人:Forschungsgesellschaft Der Fh Kaernten Gmbh；
    IPC主号:
    专利说明:

    Method and arrangement for detecting a seat occupancy
    The invention relates to a method and associated, in case of need, with little effort and retrofittable,
    Arrangements for reliably detecting the occupancy status of a seat, in particular for mass transit vehicles or auditoriums.
    The sensor-based detection of the occupancy of ic seats is becoming increasingly important.
    Areas of application for such systems can be found, for example, in i) motor vehicle safety technology, e.g. ii) for passenger transport logistics, i5 for example for determining the number or location of free seats in mass transportation means such as buses, subways or trains, etc. or iii) the control system and Optimization of the occupancy of auditoriums with free choice of location, such as in lecture theaters, in lectures, sports or 20 artistic performances, etc.
    The technical core requirement for such seat occupancy sensors is the ability to recognize the occupancy of a seat by a person as independent as possible, regardless of their size, weight, attitude, etc., reliably. In many cases, this includes the requirement to distinguish the occupancy of a seat by other objects, such as shopping bags, luggage, rucksacks, etc., from occupancy by one person. In addition, the sensor must not be disturbed by environmental influences in its function, and may cause no interference in other technical systems or sensors.
    These basic requirements are usually application-specific specifications which a sensor system must meet. For example, when used in mass transit or public transport facilities, an essential aspect is that the sensors can be retrofitted into existing vehicles or seats in a simple, cost-effective manner. Among other things, this requires that there are no significant structural changes that would require, for example, a change in typing.
    Due to the high practical relevance and the advantages of such systems, various approaches to the detection of seat occupancy 5 are already known, the emphasis being on systems for equipping passenger vehicles.
    The most common technical solution is the use of force or pressure sensors in various embodiments and arrangements, such as from DE-Al 10045689, US: o 5896090, EP-Al 1002690 or US-B1 6476514 known. The
    Sensors are integrated either in the seat or upholstery or the seat attachment. The disadvantage here is, in addition to a substantial effort for installation and wiring, that the detection of the seat occupancy i5 is purely on the weight. A light person, e.g. one
    Child, it may not be detected under certain circumstances, or a distinction from another load with the appropriate weight is not reliably possible. Similar restrictions also apply to a number of such optical or acoustic sensors, which are based on
    Reflection measurements, more rarely transmission measurements, detect the presence of an object on a seat.
    In addition to the high complexity and cost of such systems, and the potential impact of ultrasonic sensors on 25 (domestic) animals, these sensors again can not reliably distinguish between people and objects. Approaches to
    Integration of artificial intelligence, as known from US-B1 6445988, can alleviate, but increase this problem
    Complexity and costs of sensor technology in addition. 30 Alternatively, various types of
    Al 10124915 or DE-B3 102004050884, RF transmission arrangements proposed. The detection principle used here is the measurement of the attenuation of a high-frequency radio wave, typically in the GHz range, by a person located between 35 opposing antennas. Similarly, in DE-Al 102006044697 the associated detuning of the frequency is measured and evaluated. Decisive in both embodiments is the interaction of the radio waves -2- with the water in the (human) body, which allows a largely reliable distinction to bags, etc. The disadvantages are i) the substantial effort required to cabling the required, spatially separated transmitting and 5 receiving antennas and ii) the relatively high transmission powers required. In addition to a corresponding energy requirement and a direct load with absorbable by the body electromagnetic radiation, this causes the risk of disturbing other working in the same frequency range RF-io systems. In addition, when using such sensors in rooms with multiple seats or sensors, such as railway cars, auditoriums, etc., the risk of crosstalk of the radio signals. Thus, these solutions are classified as unsuitable for the intended application. From JP-B2 3413479 an arrangement is known in which capacitive sensors are to be used. These are also in principle able to distinguish between (watery) persons and non-aqueous objects, as long as the latter are not electrically conductive. In addition, they are i) comparatively simple in design and easy to integrate into a seat, and ii) limited in effect on the proximity of the seat, preventing crosstalk to other sensors. However, the electric fields of metallic objects in the effective region 25 of the sensor are strongly influenced. In practice, such sensors can only be used reliably if the seats have no metallic support structures and no larger metal objects are located in the vicinity of the monitored seat. This essential limitation applies analogously to a number of other known capacitive and / or inductive sensors. Overall, there is thus far no technically satisfactory solution for practicable implementation of simple and cost-effective retrofit sensors .35 for the reliable detection of the occupancy state of a seat, especially in environments with multiple seats.
    The invention aims to remedy this situation. -3 »· #« · · * · * I «* * · 4« · φ · φ · · Φ Φ • φ · »··· I I 4 · I ·· * · Φ «· I * *
    According to the invention, it is proposed to detect the occupancy state of a seat via the characteristic change in the electromagnetic coupling between two adjacent antennas by the presence of a proximal (human) body. For this purpose, UHF radio waves of suitable frequency (s) are emitted by a transmitting antenna and the coupled-in energy is measured and evaluated on at least one adjacent receiving antenna. From the intensity and / or phase relations of the emitted and the received radio waves, it is thus possible with minimal transmission power to
    Occupancy state of the seat reliably determined and transmitted in a row to a higher-level data processing system, etc.
    The function of the detection method 6 according to the invention in detail and the practical implementation in particularly advantageous arrangements for different application scenarios will be explained with reference to the following figures.
    1 shows the principal function of the detection method according to the invention for an exemplary arrangement with a pair of antennas consisting of a transmitting antenna and a receiving antenna arranged below the seat plane of a seat, and the coupling between these antennas influenced by the presence of a body on the seat, in a side 2-D view. 25 Fig. 2 comparatively shows the typical
    Frequency dependencies of the coupling between transmitting and receiving antenna for an unoccupied and a seat occupied as intended, in one of the relations of the power P and the phase φ comprehensive representation of the 30 scattering parameter S21 of the entire system representing quadrupole.
    3 shows an exemplary structure of a sensor according to the invention with transmitting and receiving antenna, evaluation circuit, power supply and connection for data transmission in a coplanar arrangement on a common carrier, in a plan view from above. -4-
    FIG. 4 shows a possible implementation of the mutually inclined antenna pair detection method according to the invention in a frontal 2-D view.
    5 shows a further possible embodiment for carrying out the detection method according to the invention with multiple receiving antennas arranged around a common transmitting antenna, in a 3-D view.
    6 shows a possible implementation of the detection method according to the invention with a first sensor system according to the invention below the seat surface of the seat and a second sensor system according to the invention in or behind the backrest of the seat, in a 3-D view.
    According to the method, a transmitting antenna 21 emits electromagnetic waves 211 in order to detect the occupancy state of a seat 1.
    When not occupying the seat 1, or when occupied with an electrically non-conductive object, the electromagnetic radio waves 211 are emitted substantially undisturbed 20, wherein the intensity of which with the square of the
    Distance decreases. In this case, energy is coupled into a receiving antenna 22 arranged at a suitable distance laterally offset to the transmitting antenna 21. This basically existing coupling between spatially close antennas thus represents the reference base for the evaluation of the effect of occupancy of the specific seat with an object. By regularly measuring the coupling behavior in the non-occupied state and storing the thus obtained coupling parameters as (updated) reference values a possible sensor drift or related influencing the reference base
    Effects are compensated. Furthermore, this system inherent permanent reception can also be continuous
    Function monitoring of the sensor used.
    As shown in Fig. 1, there is an electrically conductive body, e.g. a person 11, within the effective range of
    Antennas 21, 22, a part of the emitted radio waves 211 is reflected by this body 11. This reflected radiation 221 is partially offset by the laterally offset '5 * * * * * * *
    Receive antenna 22, which manifests itself in an intensified coupling between the antennas. The associated signal change at the output of the receiving antenna in comparison to the unoccupied state can be evaluated in a suitable manner in an evaluation circuit 3 and via a - optionally wired or wireless - signal path 41 to a higher-level data processing or information system 4 or a comparable device to get redirected. By the use of a dedicated near-field detection method proposed according to the invention and the small constructively required distances between the antennas 21, 22 and the object 11 of typically 100 mm, the method according to the invention is capable of seat occupancy with low transmission powers of typically 0 dBm detect. Together with low duty cycles and measurement, preferably with radiofrequencies that are reflected as efficiently as possible from the body surface, this results in minimal EM loads of orders of magnitude below the permissible specific absorption rates (SAR).
    The function of the arrangement according to the invention is essentially dependent on the reflection properties of electromagnetic waves on various objects, including the human body. These reflection properties are frequency-dependent, as shown in FIG. 2 in excerpts for the particularly relevant frequency range 800-1,000 MHz. For a particular, in the example shown Fig. 1 corresponding, arrangement of transmitting antenna 21 and receiving antenna 22 results for the unoccupied seat 30, a certain power relation 51 between transmitting and receiving channel, and a corresponding phase relation 52nd
    In the presence of an electrically conductive body, the frequency-dependent coupling properties between the transmitting and receiving antenna in a characteristic manner and manner change.
    When occupying the seat with electrically non-conductive objects, e.g. Pieces of luggage, analogue courses are obtained for the empty state. The same applies to -6- »· · · · · · · · · · · · · · · · · · · · · · · · · · · · * * * ··
    • * * * · · * I
    Dirt on the seat, including usual humidity. If, on the other hand, there is an object with the electrical properties of a human body in the effective range of the sensor, the power coupled into the receiving antenna 22 rises, corresponding to curve 61, accompanied by a change in the signal phase position, profile 62. An electrically highly conductive object, for example a metal case , would cause a much stronger reflection, which would be expressed in a again significantly different coupling between transmitting and receiving antenna. This allows, in addition to the detection of the occupancy of a seat and a reliable distinction according to the type of occupancy.
    In the simplest case, which is often sufficient for operational practice, the classification is carried out according to the parameter P, i. the relation between emitted power and received power, at a fixed frequency. When occupying the seat with a human, this value is significantly higher than in the unoccupied (reference) state or when occupying with an electrically non-conductive object, but significantly lower e.g. when occupying the seat with metallic objects. Depending on the application, application-specific application limits can be drawn here, for example taking into account the influence of a thick winter jacket or of coins in a back pocket.
    Analogously, the phase angle φ can be evaluated, or P and φ can be evaluated in a correlated manner. For higher demands on the reliability and / or the differentiation between different objects, it is also possible to measure at two or more frequencies, and in addition to the absolute and relative values and / or the frequency curves of P and / or φ to use for evaluation ,
    Overall, the inventive method, in particular for operation at UHF frequencies in. Range 700 - 970 MHz suitable. At higher frequencies, the absorption of the electromagnetic waves in the human body dominates, which means that with the arrangements according to the invention no significant difference between occupied and unoccupied state is reached.
    is detectable. Towards lower frequencies, i) the decreasing coupling strength, and thus the lower signal strength at the output of the receiving antenna, and ii) the significantly larger b types of antennas required for this frequency range are the most practically limiting factors.
    Taking into account the legal requirements for the inventive method in the ITU region 1 (Europe, etc.) thus particularly preferably frequencies in the region of the SRD 868 MHz band, in the ITU region 2 (North and South America) particularly preferably frequencies in Range of the ISM 915 MHz band used.
    The measurement normally takes place intermittently at certain time intervals which can be selected according to the application, typically in the range of a few seconds to several minutes. In comparison, the typical measurement times are on the order of a few milliseconds, resulting in duty cycles (usually> 1 ° ¾). 20 During the actual measurement are transmit and
    Receive antenna active at the same time. Optionally, it is also possible to activate the receiving antenna 22 before and / or after the actual measurement in order to detect background or interference signals. This makes it possible to correct the measurement (s) accordingly or, in the case of an excessively high interference signal level, to postpone the measurement until a sufficiently low-interference measurement window is available.
    Another essential advantage of the method according to the invention for practical use is that, unlike in the case of capacitive systems, for example, the radiation or reception behavior of the antennas can be optimized specifically for the application (seat construction, space requirement, operating frequencies, etc.).
    A first such arrangement is designed for use in or under bucket seats, as they are often used in local trains, auditoriums, etc. are used. The distance between the seat bottom, where in many cases the sensor according to the invention preferably -8- is arranged, and the seat typically only a few centimeters.
    The small distance to the object 11 to be defective makes it possible to carry out the sensors in a compact design with a coplanar 5 antenna pair 21, 22. To minimize the
    Production and installation costs, it is particularly advantageous to arrange transmitting antenna 21, receiving antenna 22, control and evaluation electronics 3 and the terminal 32 for data transmission on a common carrier 31, ic as shown in Fig. 3 by way of example. In this case, the antennas are preferably designed as patch antennas, which are arranged on the carrier 31 in a size suitable for the operating frequency and at a suitable distance from one another. The carrier materials used are, in particular, classic i5 printed circuit boards ("printed circuit boards") or flexible flexprints.
    It is particularly advantageous with this arrangement that the sensor can be installed as an object without problems, without cabling or interference with the structure or fastening of the seat, at a suitable location inside or below a seat to be monitored. Optionally, it is also possible to integrate a local energy source 33, usually optionally a primary cell ("battery") or secondary cell ("accumulator"). Combined with a wireless mono- or bi-directional data transmission 41 between the sensor and the higher-level unit 4, this makes it possible to install the sensors without cabling or other structural changes, if necessary also subsequently. 3c. A second exemplary arrangement, as shown in FIG. 4, is particularly designed for larger spaced applications between the sensor antennas 21, 22 and the seat, such as are used in well-cushioned comfort seats on long-distance trains or in passenger vehicles 35 , Here, it is advantageous to arrange the transmitting antenna 21 and the receiving antenna 22 in such a way that the object 11 to be detected is located in the overlapping area of the -9-
    Antenna alignments and thus in the immediate effective range of the resulting antenna coupling 23 is located.
    In a further advantageous arrangement, a transmitting antenna 21 is assigned two or more receiving antennas, s as in FIG. 5 by way of example for an arrangement with four
    Receive antennas 22b, 22c, 22d and 22e shown. This causes an increase in the sensitivity and the reliability of the detection of the occupancy of a seat. Optionally, this can also be used to determine the approximate seating position of a person on the respective seat.
    Subsequently, a large number of specific optimizations, for example with regard to size, shape and position of the feedpoints of the antennas as well as their optimal three-dimensional arrangement relative to one another, to the object to be detected and to the environment, are conceivable and in individual cases necessary. This optimization corresponds to the relevant state of the art and can be routinely carried out, for example with the aid of corresponding computer-aided simulation tools, without exceeding the scope of the claimed protection.
    The restriction of the effective range of the sensors according to the invention to the near field makes it possible to directly monitor adjacent seats without interactions or other interference with identically constructed sensors. Likewise, it is thus possible to use several inventive
    Sensors to integrate independently into a seat 1, as in Fig. 6 for a playable
    Embodiment with a first sensor system 21, 22 shown below the seat and a second sensor system 21a, 22a in the backrest of the seat 1, without resulting in a crosstalk between the coupling 23 of the first sensor system and the coupling 23a of the second sensor system. In practice, for example, this allows an occupancy of a seat by a person to be occupied by an animal, e.g. to distinguish a dog, or to differentiate an occupancy of two or more seats by a corresponding number of seated persons from an occupancy by a single person lying down. -10- • · 4 I «« '> * · ≪ • · · *
    In summary, the method according to the invention thus has a number of practical and technical advantages compared to previously known measuring principles, which make it particularly advantageous for the intended use as a detection system for seat occupancy, particularly in environments with multiple seats to be monitored:
    The method allows a selective detection of the occupancy of a seat by a person, including a distinction of electrically non-conductive as well as metallic objects. Likewise, a continuous function monitoring of the sensor is possible.
    The measuring system is free of moving parts and as far as possible insensitive to dirt and other environmental influences.
    The radiated transmission power as well as the power absorbed by the body are significantly lower than in comparable methods and can be optimized in a simple manner specifically for the application or the operating environment of the sensor. In addition to a minimized load with electromagnetic radiation, this results in the possibility to provide the sensors autonomously with the help of local energy sources in the longer term.
    In combination of a wireless information transmission of the determined occupancy state, it is possible to retrofit seats without structural changes (wiring, etc.) and thereby possibly required change types with the sensor systems according to the invention. 11-
    权利要求:
    Claims (20)
    [1]
    «» «« «« I «» «» ··················································································································································································································· the occupancy state of a seat, characterized in that detects the occupancy of the seat by detecting, caused by the presence of a 5 body in the vicinity of the seat, change (s) of the electromagnetic coupling behavior between a radio wave emitting transmitting antenna and at least one receiving these radio waves receiving antenna is, wherein the transmitting and receiving antenna (s) are arranged in substantially laterally adjacent in the same plane.
    [2]
    2. A method for detecting the occupancy state of a seat according to claim 1, characterized in that as parameters for the electromagnetic coupling behavior, the iS ratio of the signal intensity at the output of the receiving antenna (s) to the signal intensity at the input of the associated transmitting antenna and / or the phase shift between emitted and received radio waves are determined.
    [3]
    3. A method for detecting the occupancy state of a seat according to claim 1 or 2, characterized in that the coupling behavior is determined at a suitable frequency within the frequency range 700 MHz to 970 MHz, and determined therefrom change of the coupling behavior relative to the coupling behavior in the unoccupied State represents the measure for determining the occupancy state.
    [4]
    4. A method for detecting the occupancy state of a seat according to claim 1 or 2, characterized in that the coupling behavior are determined at least two separate suitable frequencies within the frequency range 700 MHz to 970 MHz, and the absolute and / or relative changes determined therefrom the coupling parameters in relation to the coupling behavior in the non-occupied state represent the measures for determining the occupancy state.
    [5]
    5. A method for detecting the occupancy state of a seat according to claim 1 or 2, characterized in that Ί2- ·· -> * · · · · «4« «1 * 1 i * + · *» · * * * r * V 4 * * * • * · «· I · · · · ·» that the coupling behavior is determined continuously over at least a subrange of the UHF frequency range 700 - 970 MHz, and the changes of the determined frequency dependent courses of the coupling parameters relative to the 5 coupling behavior in the unoccupied one State represent the dimensions for determining the occupancy state.
    [6]
    6. A method for detecting the occupancy state of a seat according to one of claims 1 to 5, characterized in that the acting as a reference ic coupling behavior measured in the unoccupied state at regular intervals and as an updated reference (s) in the sensor and / or a higher-level control system is deposited for the evaluation, thereby to compensate for sensor drifts and / or comparable, the sensitivity and reliability of the iö process affecting effects.
    [7]
    7. A method for detecting the occupancy state of a seat according to claims 1 to 6, characterized in that the transmission power is of the order of 0 dBm.
    [8]
    8. A method for detecting the occupancy state of a 2 c seat according to one of claims 1 to 7, characterized in that the measurement, preferably in application-dependent freely selectable time intervals, takes place intermittently.
    [9]
    9. A method for detecting the occupancy state of a 2s seat according to claim 8, characterized in that prior to the start of the emission of radio waves by the transmitting antenna, the receiving antenna records the electromagnetic background and determines an evaluation arrangement of whether i) undisturbed measurement is possible, ii) or (iii) the measurement is timed until the background is sufficiently low to allow a reliable measurement of the coupling behavior at the selected operating frequency (35); en).
    [10]
    10. A method for the independent detection of occupancy states of multiple seats in mass transit means, such as in particular railways, metro trains. 13 ^ ***** * * «· IM« · * · * «» * * * »+ * · * * * * · Φ * · · «· · * * or tram trains or buses, characterized by the use of at least one sensor arrangement according to the features of one of claims 1 to 9 per seat to be monitored.
    [11]
    11. A method for the independent detection of occupancy states of multiple seats in auditoriums, characterized by the use of each at least one sensor arrangement according to the features of one of claims 1 to 9 depending to be monitored seat. io
    [12]
    12. A method for detecting the occupancy state of one or more seats, in particular the passenger seat, in passenger motor vehicleseines, characterized by the use of at least one sensor arrangement according to the features of one of claims 1 to 9 each to be monitored seat i5.
    [13]
    13. Arrangement for carrying out the method for detecting the occupancy state of a seat according to claims 1 to 12, characterized in that the transmitting antenna and the, at least one, receiving antenna co-2c are arranged planar, preferably on a suitable common carrier, such as a printed circuit board.
    [14]
    14. An arrangement for carrying out the method for detecting the occupancy state of a seat according to one of claims 1 to 12, characterized in that the transmitting antenna 25 and the, at least one, receiving antenna are arranged substantially in the same plane inclined to each other so that the object or person to be detected is located in the overlapping area of the antenna orientations. 5c
    [15]
    15. An arrangement according to claim 13 or 14, characterized in that a transmitting antenna are associated with a plurality of offset in different lateral directions arranged receiving antennas.
    [16]
    16. Arrangement according to one of claims 13 to 15, 35, characterized in that the type, design, arrangement and orientation of the antennas for the application and the installation conditions are selected optimized accordingly. ΛΛ-
    [17]
    17. Arrangement according to one of claims 13 to 16, characterized in that further electronic components, in particular a control and evaluation for autonomous generation of the transmission signals and detection and evaluation of the 5 measuring signals, a local energy source and / or a suitable communication interface parts are integrated ,
    [18]
    18. Arrangement for carrying out the method for detecting the occupancy state of a seat according to one of claims 13 to 17, characterized in that each seat to be monitored at least one sensor arrangement according to the invention is integrated in or under the seat of the seat.
    [19]
    19. Arrangement for carrying out the method for i5 detection of occupancy state of a seat according to one of claims 13 to 18, characterized in that each to be monitored seat, possibly in addition to and independent of one or more sensor arrangements according to the invention in the seating area of the seat, at least one invention
    [20]
    20 sensor assembly is integrated in or behind the backrest of the seat. -15-
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    同族专利:
    公开号 | 公开日
    AT511497B1|2013-02-15|
    EP2529981A1|2012-12-05|
    EP2529981B1|2015-09-16|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2004083004A1|2003-03-21|2004-09-30|Siemens Aktiengesellschaft|System and method for identifying seat occupancy in a vehicle|
    DE102004032473A1|2004-07-05|2006-02-02|Siemens Ag|Evaluation method and evaluation device for a system for seat occupancy recognition|
    JP2909961B2|1996-05-29|1999-06-23|アイシン精機株式会社|Seating detection device|
    US6445988B1|1997-02-06|2002-09-03|Automotive Technologies International Inc.|System for determining the occupancy state of a seat in a vehicle and controlling a component based thereon|
    JP3413479B2|1998-03-18|2003-06-03|株式会社ホンダエレシス|Occupant detection system|
    JP2000155057A|1998-11-20|2000-06-06|Asuko Kk|Seating detecting device|
    JP2001080404A|1999-09-17|2001-03-27|Aisin Seiki Co Ltd|Seating detecting device|
    US6476514B1|2000-03-29|2002-11-05|Ford Global Technologies, Inc.|Occupant detection sensor assembly for seats|
    DE10124915A1|2001-05-22|2002-12-12|Bosch Gmbh Robert|Arrangement for recording the occupancy of a seat|
    DE102004050884B3|2004-10-19|2006-04-27|Siemens Ag|Device for detecting the seat occupancy of a seat|
    DE102006044697B4|2006-09-22|2016-06-02|Bayerische Motoren Werke Aktiengesellschaft|Seat occupancy detection, in particular with an RFID circuit|DE102015215408A1|2015-08-12|2017-02-16|Digades Gmbh Digitales Und Analoges Schaltungsdesign|A proximity sensor and method for detecting an approach to a vehicle interior trim part of a vehicle|
    DE102017215864B3|2017-09-08|2019-03-07|Audi Ag|Method for regulating a transmission power for a radio connection originating from a motor vehicle, regulating device for a motor vehicle and motor vehicle with control device|
    法律状态:
    2021-02-15| PC| Change of the owner|Owner name: PROSOFT SUED CONSULTING GMBH, AT Effective date: 20210114 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT7962011A|AT511497B1|2011-05-31|2011-05-31|METHOD AND ARRANGEMENT FOR DETECTING A SEATPLACE ACCELERATION|AT7962011A| AT511497B1|2011-05-31|2011-05-31|METHOD AND ARRANGEMENT FOR DETECTING A SEATPLACE ACCELERATION|
    EP12004001.9A| EP2529981B1|2011-05-31|2012-05-23|Method and system for detecting whether a seat is occupied|
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