WO2010105974A1 - Induktives sensormodul für ein fahrzeug und verfahren zum betreiben eines solchen sensormoduls - Google Patents
Induktives sensormodul für ein fahrzeug und verfahren zum betreiben eines solchen sensormoduls Download PDFInfo
- Publication number
- WO2010105974A1 WO2010105974A1 PCT/EP2010/053153 EP2010053153W WO2010105974A1 WO 2010105974 A1 WO2010105974 A1 WO 2010105974A1 EP 2010053153 W EP2010053153 W EP 2010053153W WO 2010105974 A1 WO2010105974 A1 WO 2010105974A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor module
- data
- sensor
- vehicle
- memory
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000001939 inductive effect Effects 0.000 title claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 14
- 230000006870 function Effects 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 3
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 230000001419 dependent effect Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 230000001133 acceleration Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000004907 flux Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 238000007781 pre-processing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000005355 Hall effect Effects 0.000 description 2
- 101100103009 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) WSS1 gene Proteins 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000005405 multipole Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P1/00—Details of instruments
- G01P1/12—Recording devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
- G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
- G01P15/09—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by piezoelectric pick-up
Definitions
- the invention relates to a sensor module for a vehicle safety system or a method for operating such a sensor module according to the preamble of the independent claims.
- a wireless rotational speed sensor is known in which the rotational speed of a motor vehicle wheel is measured and the measured values taken by the sensor are processed into a data telegram which indicates the rotational speed of the wheel. Furthermore, the sensor is configured such that the data telegram is transmitted wirelessly.
- the present sensor component includes a battery or other type of power or power source that generally provides relatively little power, such as power. B. from a supply with lower
- a so-called ECU component may instruct the sensor component to enter a sleep mode to conserve battery power since the vehicle may be stopped.
- a wireless speed sensor system is known in the necessary energy is generated and / or stored to the wireless
- an energy management uses a generator for power generation, which makes use of the rotation of the vehicle wheel for power generation.
- Storage devices are a high-efficiency rechargeable battery or a supercapacitor.
- a generator a so-called multi-polar rotation generator can be used become.
- the transmitter element may be switched to a sleep mode or inactive until the controller wakes up the sensor via its transmitter module.
- the sensor module according to the invention for a vehicle safety system or the corresponding method for operating such a sensor module have the advantage that the sensor module has a memory for the data and a control device, wherein the control device in dependence on at least one vehicle size and / or an event, the data read from memory and shipped.
- a case-dependent transmission is possible, which reduces the energy consumption, but at the same time has no restriction in the temporal continuity of the data.
- a precise analysis in the evaluation algorithm in a control unit for example for the control of brakes, possible.
- the invention is of great use, since usually four speed sensors are arranged in a vehicle, one for each tire and so the radio communication can be kept to a minimum.
- the provision of a memory in the sensor module makes it possible for even first analyzes to be carried out in the sensor module itself so that the control unit, as the receiver of the transmitted radio signals, is relieved of such analyzes. This brings a speed advantage in the evaluation of the data.
- a sensor module in the present case is a structural unit such as a speed sensor or an acceleration sensor or yaw rate sensor or
- the sensor module can have the actual sensor element, in the present example, the Hall effect of the anisotropic magnetoresistive effect (AMR) and the giant magnetoresistor
- the sensor module is a closed structural unit. Only connection means to the installation location are provided.
- the vehicle safety system is, for example, a vehicle dynamics control system, a brake system and / or an airbag system.
- Sensor signal is at least a radio transmitter, which can use, for example, with high frequency spread such as DSSS: Direct Sequence Spread Spectrum or a continuous change of the transmission frequency (FHSS: Frequency Hopping Spread Spectrum). Even a so-called RFID so a transponder technology can be used in the present case.
- DSSS Direct Sequence Spread Spectrum
- FHSS Frequency Hopping Spread Spectrum
- the power supply can also take place via emitted electromagnetic waves, wherein the induced current is rectified in an antenna coil in the sensor module and charges an energy store.
- the energy storage supplies the chip for the current for the reading process or can only be used for the supply of the microchip.
- the signal transmission takes place directly from the transmitter in a control unit or from an external transmitter to the sensor.
- the RFID tag modulates the electromagnetic wave and thus transmits the information.
- the data are, for example, data telegrams in which the actual sensor values are accommodated.
- the sensor signal represents the sensor values that the sensor element emits. This can also be a multiplex of sensor signals.
- this data telegram can also contain further data such as identification data or additional data for error correction.
- a dynamically acting measuring principle is a measuring principle in which energy is generated simultaneously with the measuring process.
- a preferred expression for this purpose is an inductive measuring principle, but there are also other measuring principles, such as a piezoelectric or a
- Vibration converter possible. With the measuring principle, therefore, a measuring device is described, which also generates energy.
- the memory is usually referred to as an electronic memory in which the data can be stored. This memory will usually provided as an integrated circuit.
- the controller may be either an application specific circuit (ASIC) or a programmable device such as a microcontroller or microprocessor. A mechanical control device which reacts to the vehicle size or an event can also be provided in the present case.
- ASIC application specific circuit
- a mechanical control device which reacts to the vehicle size or an event can also be provided in the present case.
- the operation of the sensor module means the commissioning of the sensor module.
- the memory is designed as a ring memory. Under a
- Ring memory refers to a memory which stores data continuously over a certain period of time and overwrites this again after the expiry of a predetermined time, in order to free up the storage space for new data.
- the memory and the control device are arranged on an integrated circuit. This allows a compact design and reduces the space requirement of the sensor module. Also, the reliability can be increased.
- the device is configured such that the energy and the sensor signal are generated by the induction by a linear movement or a rotational movement.
- the sensor module is configured for a low-power and a high-power mode, wherein the sensor module has a change-over switch, which depends on a vehicle size and / or an event between the low-power and switch to high-power mode.
- the low-power mode means a state in which the sensor module consumes little power while in the high-power mode correspondingly more energy consumed, ie the high-power mode consumes more energy than the low-power mode.
- the switch can be customary manner by software but also electronically or mechanically. The action on this switch takes place in
- the vehicle speed and / or an event such as a wheel condition such as a slip or blocking wheels.
- the event-dependent activation of the changeover switch is dependent on a rule.
- the data transmission rate of the transmitter can thus be vehicle-speed-dependent or rule-based.
- the data in a microcontroller or other processor or evaluation circuit is processed at a low clock rate and sent at a low data rate from the sensor module to a controller, at high speed this is reversed.
- the clock frequency for data processing in the microcontroller and the data transfer rate during normal operation is low.
- the signals with a high clock frequency in the signals When needed, such as slippage or jamming of the wheels, the signals with a high clock frequency in the
- the speed-dependent or rule-based signal transmission can be combined.
- the sensor module has an energy management with this switch, which is arranged on an integrated circuit on which a preprocessing of the sensor signal is provided.
- these functions can be integrated with one another on an ASIC and a particularly cost-effective compact production can be selected.
- Show it 1 is a block diagram of a vehicle safety system
- Fig. 4 is a block diagram of the sensor module according to the invention and a
- Fig. 6 is a block diagram of the transmitter
- FIG. 7 shows a flow chart of the method according to the invention.
- Fig. 1 shows a block diagram of a vehicle safety system in a vehicle FZ with four speed sensors WSSl to 4, a control unit for the vehicle dynamics control ESP and one of the ES P control unit ESP-controlled
- the speed sensor WSSL to 4 are connected via a radio transmission with the control unit ESP, so that the speed sensor WSSl to 4 each have antennas Al to A4 to transmit their data to the control unit ESP, the control unit ESP for receiving this data, the antenna A5 having.
- at least each rotational speed sensor WSS1 to 4 has a transmission module in order, for example, to transmit data to the control device ESP in the frequency spreading method, wherein the control device ESP has at least one receiver device in order to be able to correctly receive and demodulate these signals. It is possible that the radio connection between the speed sensors WSSl to 4 and the control unit ESP unidirectional of the
- Speed sensors to the controller ESP or bidirectional can be performed.
- a broadcast mode is also possible. By this is meant that one sensor sends data to all without addressing a specific receiver, as is common in broadcast transmissions. It is also possible for the speed sensors to transmit their data to another device, for example a further sensor, which is then connected via a cable connection to the control device ESP and thus executes this second part via a wired transmission of the data.
- the control unit ESP controls as a function of this sensor and others
- Sensor signals to the actuator AKT for example, brakes.
- sensors for vehicle safety systems such as crash sensors, are for example acceleration sensors, yaw rate sensors, force sensors, structure-borne sound sensors, air pressure sensors and also environment sensors such as video,
- Radar Lidar or ultrasound wirelessly connectable to a control unit.
- Fig. 2 shows the operation of an active speed sensor, which is connected to the power source for operation with a voltage source.
- the sensors detect the change in the magnetic flux density.
- a Hall sensor is provided as the sensor element 22, which measures the change in the magnetic flux density of the steel wheel 20.
- a magnet 21 is still provided, which is changed by the rotating steel wheel in its magnetic field.
- the resulting signal is a sine signal 23, which is forwarded to the control unit ECU for further processing.
- a multipole encoder 30 is provided as a wheel with changing magnetic poles. The rotation of this wheel causes a change in the magnetic flux in the sensor element 31.
- the signals of the sensor element are evaluated by an ASIC and then transmitted as digital signals to a control unit ECU. These digital signals are designated by the reference numeral 32.
- Fig. 4 shows a block diagram of the sensor module according to the invention denoted by the reference numerals 40 to 45 and the control unit ECU.
- the sensor module according to the invention has a single device 40 for the simultaneous generation of the sensor signal and the energy.
- an energy management 41 which is arranged in an ASIC manner, the energy is stored in an energy store 42, for example a capacitor, which is also used for EMC (electromagnetic compatibility).
- the sensor signal is transmitted to an analog-to-digital converter within or outside a microcontroller 43 for digitizing the sensor signal.
- the microcontroller 43 stores the digitized
- These data can be obtained either from the sensor signal itself or from the ECU.
- the radio traffic is also designed bidirectional.
- the ASIC forms a speed-dependent voltage signal from the sensor signal, which is already processed digitally in the sensor module.
- the microcontroller 43 can convert the sensor signal into a control unit-specific signal, it evaluates and stores the data continuously in the ring buffer.
- the stored data are usually z. B. in an inadmissible
- Speed change then available and are forwarded to the transceiver 45 to transmit it to the control unit ECU.
- the conversion in the ASIC or in the microcontroller into a digital speed or acceleration signal allows easy further processing.
- This speed or acceleration signal can be transmitted either directly to the ECU with the transmitter 45 or transceiver at fixed discrete intervals to the ECU or the signal is previously processed in the microcontroller and evaluated.
- the above-described speed-dependent or rule-based data transmission rate of the transceiver 45 can then be set.
- Fig. 5 visualizes a section of the sensor module according to the invention.
- a coil SP is connected to an ASIC on the one hand for the sensor processing PP and for other connected to the power generation EE.
- the power supply EE can in particular charge a capacitor C or other capacitors or energy storage.
- the sensor signal prepared by the sensor signal preprocessing PP is transmitted to the transceiver TX, which emits the data via the antenna AT in dependence on the sensor signal.
- the digital signal can first be converted into an analog signal in order to amplify it and then modulate it, for example via a frequency spread or frequency hopping.
- the modulation can also be done already in the digital and it can still be an amplifier used after the modulation.
- the receiver structure is designed: After a receiving antenna usually follows a frequency converter, an amplifier and filter and a digital signal processing.
- step 700 simultaneous sensor signal and power generation takes place, for example, with coil SP.
- the sensor signal is preprocessed in method step 701 and supplies, for example, parameters which the energy management in method step 702 requires in order to decide whether it is necessary to switch over between a low-power and a high-power mode of the sensor module.
- the preprocessed sensor signal is stored in step 704 for transmission and sent in step 705.
- the control device decides on the basis of vehicle sizes and / or the event whether the transmission should take place or not. In synchronism, the energy management is operated, because you need a lot of energy for the transmission state and little for pure measurement.
- the energy management decides in method step 703 how much energy is to be provided, ie high-power or low-power mode or which consumption can be set by the clock rate of the processing or transmission rate of the transmission via the transmitter TX.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/993,873 US20110068912A1 (en) | 2009-03-17 | 2010-03-12 | Inductive sensor module for a vehicle and method for operating such a sensor module |
CN2010800123069A CN102356321A (zh) | 2009-03-17 | 2010-03-12 | 汽车的感应式传感器模块和运行这种传感器模块的方法 |
EP10709997A EP2409161A1 (de) | 2009-03-17 | 2010-03-12 | Induktives sensormodul für ein fahrzeug und verfahren zum betreiben eines solchen sensormoduls |
JP2011553463A JP2012520450A (ja) | 2009-03-17 | 2010-03-12 | 車両用の誘導センサモジュールおよび該センサモジュールの作動方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009001617.1 | 2009-03-17 | ||
DE102009001617A DE102009001617A1 (de) | 2009-03-17 | 2009-03-17 | Sensormodul für ein Fahrzeugsicherheitssystem und Verfahren zum Betreiben eines solchen Sensormoduls |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010105974A1 true WO2010105974A1 (de) | 2010-09-23 |
Family
ID=42199128
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2010/053153 WO2010105974A1 (de) | 2009-03-17 | 2010-03-12 | Induktives sensormodul für ein fahrzeug und verfahren zum betreiben eines solchen sensormoduls |
Country Status (6)
Country | Link |
---|---|
US (1) | US20110068912A1 (de) |
EP (1) | EP2409161A1 (de) |
JP (1) | JP2012520450A (de) |
CN (1) | CN102356321A (de) |
DE (1) | DE102009001617A1 (de) |
WO (1) | WO2010105974A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8215162B2 (en) * | 2009-07-27 | 2012-07-10 | Eldec Corporation | Focused field antenna for passive RFID tire pressure sensor transponder |
US9002574B2 (en) | 2009-10-15 | 2015-04-07 | Airbiquity Inc. | Mobile integration platform (MIP) integrated handset application proxy (HAP) |
US8942888B2 (en) | 2009-10-15 | 2015-01-27 | Airbiquity Inc. | Extensible scheme for operating vehicle head unit as extended interface for mobile device |
DE102010062567A1 (de) | 2010-12-07 | 2012-06-14 | Robert Bosch Gmbh | Verfahren, Sensormodul und System zur Datenübertragung |
DE102011005764A1 (de) | 2011-03-18 | 2012-09-20 | Robert Bosch Gmbh | Vorrichtung und Verfahren zum Messen von Magnetfeldern |
EP2859464B1 (de) * | 2012-06-08 | 2020-09-16 | Airbiquity, Inc. | Beurteilung von elektronischen sensordaten zur entfernten identifizierung eines kraftfahrzeugs und zur überwachung des fahrverhaltens |
EP2685220A3 (de) * | 2012-07-10 | 2017-08-02 | Stichting IMEC Nederland | Eigenbetriebenes Sensorsystem |
DE102013206074A1 (de) * | 2012-12-20 | 2014-06-26 | Continental Teves Ag & Co. Ohg | Verfahren zum Verwalten eines Fahrzeugsensorsystems |
EP2936861B1 (de) | 2012-12-20 | 2021-07-21 | Airbiquity, Inc. | Effiziente kommunikation mit integration einer kopfeinheit |
FR3026482B1 (fr) * | 2014-09-26 | 2018-02-16 | Safran Landing Systems | Dispositif de mesure de vitesse de rotation d’une roue |
DE102014015129A1 (de) * | 2014-10-14 | 2016-04-14 | Wabco Gmbh | Verfahren zur Identifikation einer Sensorvorrichtung zur Drehzahlmessung, Sensorvorrichtung zur Drehzahlmessung und Fahrzeug mit wenigstens einer Sensorvorrichtung zur Drehzahlmessung |
US10473678B2 (en) | 2016-04-18 | 2019-11-12 | Ford Global Technologies, Llc | Detection and wireless transmission of wheel rotation direction |
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EP0594550A1 (de) * | 1992-10-19 | 1994-04-27 | Ab Skf | Verfahren und Vorrichtung in einem Lager |
DE19514008A1 (de) * | 1995-04-13 | 1996-10-17 | Vdo Schindling | Fahrdatenregistriergerät für Kraftfahrzeuge |
EP1347272A2 (de) * | 2002-03-18 | 2003-09-24 | WIKON Kommunikationstechnik GmbH | Vorrichtung zum Fernmessen von Veränderungen physikalischer Grössen |
US20040150516A1 (en) | 2003-02-05 | 2004-08-05 | Delphi Technologies, Inc. | Wireless wheel speed sensor system |
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-
2009
- 2009-03-17 DE DE102009001617A patent/DE102009001617A1/de not_active Withdrawn
-
2010
- 2010-03-12 EP EP10709997A patent/EP2409161A1/de not_active Withdrawn
- 2010-03-12 WO PCT/EP2010/053153 patent/WO2010105974A1/de active Application Filing
- 2010-03-12 US US12/993,873 patent/US20110068912A1/en not_active Abandoned
- 2010-03-12 CN CN2010800123069A patent/CN102356321A/zh active Pending
- 2010-03-12 JP JP2011553463A patent/JP2012520450A/ja active Pending
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EP0594550A1 (de) * | 1992-10-19 | 1994-04-27 | Ab Skf | Verfahren und Vorrichtung in einem Lager |
DE19514008A1 (de) * | 1995-04-13 | 1996-10-17 | Vdo Schindling | Fahrdatenregistriergerät für Kraftfahrzeuge |
US20060145881A1 (en) * | 2001-08-07 | 2006-07-06 | Nsk Ltd. | Wireless sensor, rolling bearing with sensor, management apparatus and monitoring system |
US20060239597A1 (en) * | 2002-03-08 | 2006-10-26 | Ntn Corporation | Rotation detecting device and wheel support bearing assembly utilizing the same |
EP1347272A2 (de) * | 2002-03-18 | 2003-09-24 | WIKON Kommunikationstechnik GmbH | Vorrichtung zum Fernmessen von Veränderungen physikalischer Grössen |
US20040150516A1 (en) | 2003-02-05 | 2004-08-05 | Delphi Technologies, Inc. | Wireless wheel speed sensor system |
US20050150281A1 (en) * | 2004-01-12 | 2005-07-14 | Thaddeus Schroeder | Self-powered wireless sensor assembly for sensing angular position of the engine crankshaft in a vehicle |
EP1607723A1 (de) * | 2004-06-16 | 2005-12-21 | Swisscom Mobile AG | Elektronische Baueinheit mit einem Messsensor und einer drahtlosen Schnittstelle |
DE112006003053T5 (de) | 2005-10-24 | 2008-10-09 | Infineon Technologies Ag | Drahtloser Radgeschwindigkeitssensor |
US20080070614A1 (en) * | 2006-09-14 | 2008-03-20 | Hitachi,Ltd. | Sensor network system and sensor node |
Also Published As
Publication number | Publication date |
---|---|
US20110068912A1 (en) | 2011-03-24 |
CN102356321A (zh) | 2012-02-15 |
JP2012520450A (ja) | 2012-09-06 |
EP2409161A1 (de) | 2012-01-25 |
DE102009001617A1 (de) | 2010-09-23 |
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