• 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:
    17 ABSTRACT The present invention reiates to a sensor (100) for measuring a hydrauiicpressure in a hydrauiic chamber, the sensor (100) comprising a housing (102)having an end section (124) being penetrabie to radio signais, a circuitry (100,300) housed within the housing (102), the circuitry (100, 300) comprising apressure gauge (104) for measuring the hydrauiic pressure in the hydrauiicchamber, a wireiess communication unit (110) arranged to communicate datapertaining to the hydrauiic pressure in the hydrauiic Chamber, a battery (108,300), arranged to power the sensor (100), a oiuraiity of contacts (114, 302)arranged to make gaivanic contact With outside circuitry (500, 000), whereinthe circuitry (100, 300) is arranged to be switchabie betvveen a first state anda second state, wherein in the first state the circuitry (100, 300) is arrangedsuch that the oiuraiity of Contacts (114, 302) are set to have the sameeiectricai potentiai and in the second state the circuitn/ (106, 300) is arrangedsuch that at ieast a first one of the piuraiity of contacts (114, 302) is set tohave a different electrical potentiai reiative to a second one of the piuraiity ofcontacts (114, 302). rig. 2 Figure eiected for oubiication:
    公开号:SE1351160A1
    申请号:SE1351160
    申请日:2013-10-02
    公开日:2015-01-07
    发明作者:Fredrik Sebelius；Jonas Tilly
    申请人:Novosense Ab；
    IPC主号:
    专利说明:

    ÅWAPATENT AB Kontor/HandläggareLund/Andreas Lindgren/AMS Novosense AB Ansökningsnr Vår referens SE-21066119 1WIRELESS SENSOR FOR MEASURlNG A HYDRAULIC PRESSURE FIELD OF THE šNkftšlNTlON The present invention relates to a sensor for measuring a hydraulic pressure in a hydraulic Chamber.
    BACKGROUND OF THE INVENTION Hydraulics is frequently used for the generation, control, and transmission ofpower by the use of pressurized liquids in hydraulic Chambers. Hydraulicsystems comprise one or more hydraulic Chambers for suspension andaccurate positioning of system parts in relation to each other, i.e. ashydromounts, hydro bushings, or bearing Components. An example of such asystem is attachment of a Chuck to a drive spindle of a revolving machine toolsuch as a cutting tool, drill, or tool holder. The position of the Chuck parallel toand/or perpendicular to the rotational axis of the revolving machine tool isadjusted by the forces transmitted by the Chuck, which in turn is set by theamount of hydraulic pressure in one or several hydraulic Chambers within theChuck.
    To ensure proper function of hydraulic systems it is of importance tomeasure the pressure within the hydraulic Chambers. Sensors comprisingpressure gauges are therefore at least partly arranged inside the pressureChambers in order to measure the hydraulic pressure. lt is howeverproblematic to access data pertaining to the hydraulic pressure as the sensorin many situations is arranged in heavy machinery or inside a machine tool.As the sensors often are hidden from view the powering and/orcommunication of data pertaining to the hydraulic pressure in the hydraulicChambers is advantageously obtained via electric Cables that via slidingContacts are in contact with the sensor. For hydraulic systems comprising forinstance high speed rotational parts this is, however, not an optimal solution.For these systems it is difficult to maintain an effective electrical contact.Moreover heat generation at or in the vicinity of the Contacts may reduce the 2 performance of the sensor and/or the reliability of the data communicationwith the sensor. To this end, the environment surrounding the sensors maycontain oil leakage, electrically conducting residues and/or liquids that maydisturb the performance of the Contacts, induce chemical reactions in thevicinity of the sensor or even short circuit the sensor. lt is therefore desirable to remotely access the data pertaining to thehydraulic pressure in the hydraulic Chamber. This may be accomplished byusing wireless communication. Such a solution, however, requires an internalpower source such as a battery within the sensor which limits the lifetime of the sensor.
    SUivlíMARY OF THE lNVENTlON An object of the present invention is to solve or at least to reduce theproblems discussed above. ln particular according to a first aspect of the invention, a sensor formeasuring a hydraulic pressure in a hydraulic chamber, the sensorcomprising a housing having an end section being penetrable to radio signals,a circuitry housed within the housing, the circuitry comprising a pressuregauge for measuring the hydraulic pressure in the hydraulic chamber,a wireless communication unit arranged to communicate data pertaining tothe hydraulic pressure in the hydraulic chamber, a battery, arranged to powerthe sensor, a plurality of contacts arranged to make galvanic contact withoutside circuitry, wherein the circuitry is arranged to be switchable between afirst state and a second state, wherein in the first state the circuitry isarranged such that the plurality of contacts are set to have the same electricalpotential and in the second state the circuitry is arranged such that at least afirst one of the plurality of contacts is set to have a different electrical potentialrelative to a second one of the plurality of contacts. ln the context of the present invention the term radio is construed as anelectromagnetic wave having a frequency in the radio frequency range, i.e.from about 30 kHz to 300 GHz. Examples of common standards for wireless communication utilizing radio waves are ZigBee and Bluetooth. ZigBee is a 3 low-power, wireless mesh network standard operating in the industrial,scientific and medical (ISM) radio bands; 868 MHz in Europe, 915 MHz in theUSA and Australia and 2.4 GHz in otherjurisdictions worldwide. Bluetoothalso uses short-wavelength radio transmissions in the lSM band. A personskilled in the art realizes that other standards for wireless communication canalso be used according to the present invention.
    The wording an end section being penetrab/e to radio signals shouldbe understood as that the material of the end section may be chosen suchthat it allows for radio waves to propagate through the material without fullattenuation of the amplitudes of the radio waves. Radio waves containinginformation may therefore continue to propagate after passing the end sectionsuch that the information may be transferred through the end section.
    Outside circuitry should be understood as a charger, an initiation key,test equipment or other electronic devices that are capable of communicatingwith the circultry of the sensor via one or more of the plurality of Contacts.
    By arranging the sensor such that it is switchable between the firststate and the second state it will be possible to for example charge the batteryof the sensor or swltching the sensor on or off using the plurality of Contacts.However, for charging the battery and for some implementations of swltchingthe sensor on or off contacts of the sensor must have different electricalpotentials. But if the plurality of contact of the sensor is set to differentpotentials during operation in hydraulic systems problems may occur due tooil leakage, electrically conducting residues and/or liquids that may shortcircultry the sensor. Hence, due to ability to switch the circultry between thefirst state and the second state an efficient sensor that has an improvedlifetime is obtained. lt is therefore advantageous that the sensor is switchableto the second state which provides efficient charging, initiation or electricalcommunication with the sensor that requires at least one potential differenceamong the plurality of contacts.
    The battery may be chargeable and the plurality of contacts may bearranged to make galvanic contact with the outside circultry such that charging of the battery is made possible. 4 it is favorabie that the battery of a sensor is chargeabie as this extendsthe iifetime of the sensor. This further reduces the number of parts of thesensor as the arrangement does not require that the battery is removabiyattached to or removabie fastened inside the housing of the sensor.
    As the Contacts of the sensor per se needs to be in eiectricai contactwith the chargeabie battery, the associated potentiai difference betytreen thepiuraiity of Contacts increases the risk of short Circuit of the circuitry within thesensor and chemicai reactions, such as for instance oxidation occurs at theseContacts.
    The Common potential for aii of the Contacts, in the first state, mitigatesthese and other probiems associated with the environment surrounding thesensor, i.e. the minirnized potentiai difference Within the piuraiity of Contactsreduces probiems associated with ieakage currents, short circuiting,oxidation, or Chemicai reactions causing wear of or destruction to the Contactsor the sensor. Hence the sensor can be exposed to iiquids such as water ordetergents during for instance Cleaning of the sensor, or oii, chemicaissubstances and even conducting rnateriais such as metai residues during theusage of the sensor, which couid be inside a machine tooi.
    The circuitry may be fiexibie such that the circuitry is foidabie aroundthe battery. This reduces the amount of empty space in the housing of thesensor which in turn ieads to a reduced the size of the sensor.
    The wireiess communication unit may further comprise a fiexibieantenna for transmitting andlor receiving radio signais. This is advantageousin terms of size and aiiows for optimization of the position of the antennawithin the sensor assernbiy.
    By further arranging the antenna in close proximity to the end sectionof the housing an improved transmission of radio signals to and from thesensor is achieved.
    The end section of the housing may be made of a giass, a ceramic or apiastic material as this irnproves transmission of radio signais to and from the SGHSOT. 5 The housing may Comprise a threaded portion for fastening the sensorin the hydraulic Chamber. This allows the sensor to be sCrew-fastened in atreaded recess in a hydraulic Chamber, whereby the sensor is removeablyattached to the hydraulic Chamber.
    The housing may further comprise a plurality of recesses arrangedsuch that the housing may be positioned in a predetermined relation with theoutside circuitry and/or such that an adapter used for fastening the sensor inthe hydraulic Chamber is removably engageable to the housing. Thisarrangement reduces the amount of material in the vioinity of the end sectionof the sensor.
    The housing may at least partly be made of a metal, which provides astrong and robust housing that mechanically protects the interior parts of thesenson The switching of the circuitry may be initiated by the outside circuitry.This is advantageous as the circuitry can be set to be in the first state or thesecond depending on the configuration of the outside circuitry.
    The Contacts may be arranged such that a portion of each contact isextending through the end section of the housing. This provides easy accessto the plurality of Contacts and further allows for efficient galvanic Contactingof the sensor and outside circuitry.
    Other advantages and novel features of the invention will be apparentfrom the following detailed description of examples of embodiments of theinvention when considered in conjunction with the accompanying drawings and claims.
    BRIS-ZF DESÜRtT-*TTIGN OF THE ülfšßïtvvlNüâThe above and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showingembodiments of the invention. The figures should not be considered limitingto the invention to the specific embodiment; instead they are used forexplaining and understanding the invention. As illustrated in the figures, the sizes of layers and regions are exaggerated for illustrative purposes and, 6 thus, are provided to iiiustrate the generai structures of emhodiments of thepresent invention. Like reference numerais refer to iike elements throughout.
    FiG. i is a schematic diagram of a sensor for measuring the hydrauiicpressure in a hydrauiic chamber according to an embodiment of the invention.
    FiG. 2 is a perspective side view, showing a sensor in an assembiedcondition according to an emhodirnent of the present invention.
    FIG. 3 is a perspective side view, showing an adapter for fixation of thesensor of Fig. 2.
    FiG. 4 is a schematic circuit diagram of an embodiment of a circuitrywithin a sensor according to the present invention.
    FiG. 5 is a schematic circuit diagram of an embodiment of an outsidecircuitry according to the present invention.
    FiG. 6 is a schematic circuit diagram of an ernbodiment of an outside circuitry according to the present invention. ÜETAiLED DESÛRif1TiGN_ The present invention vviii now be described more fuiiy hereinafter withreference to the accornpanying dravvings, in which currently preferredembodiments of the invention are shown. This invention may, however, beembodied in many different forms and shouid not be construed as iimited tothe embodirnents set forth herein; rather, these embodiments are provided forthoroughness and compieteness, and fuiiy convey the scope of the inventionto the skiiied person, The basic idea of this invention is to provide a sensor arranged suchthat its eiectricai contacts may he switched between a first state where thecontacts are set to have the same eiectricai potentiai and a second statewhere at ieast a first one of the piuraiity of Contacts is set to have a differenteiectricai potentiai reiative to a second one of the piuraiity of contacts.
    The common potential for aii of the Contacts, in the first state, mitigatesprobiems associated with the often harsh environment that may surround thesensor, ie, the sensor provides reduced risks of performance probiems associated with ieakage currents, shout circuiting, oxidation, or other 7 chemical reactions causing wear on the Contacts or damage to the sensor.Hence the sensor can be exposed to water or detergents during for instanceCleaning of the sensor. Oil, chemical substances or even conducting materialssuch as metal residues may also be present during usage of the sensor. Byswitching the sensor to the first state problems arising from being in theseenvironments are reduced.
    By further providing a sensor that is switchable to the second state apotential difference within the plurality of Contacts can be obtained which isadvantageous when for example charging, initiating, or shutting off thesensor.
    Referring now to the drawings and to Fig. 1 in particular. Fig. 1 showsa schematic diagram of one embodiment of the sensor 100. The sensor 100Comprises a housing 102 and a pressure gauge 104 for measuring thehydraulic pressure in a hydraulic Chamber. Further the sensor 100 Comprisescircuitry 106, a battery 108, a wireless communication unit 110 having anantenna 112; and a plurality of Contacts 114. The sensor 100 may also beequipped with a processing unit 116 and a memory 118. The battery 108, thewireless communication unit 110, the plurality of Contacts and the processormay be regarded as being part of the circuitry 106.
    Fig. 2 illustrates an embodiment of the sensor 100 in an assembledcondition. The sensor is housed in a housing 102. The housing 102Comprises an attachment portion 120, a body 122, and an end section 124.The attachment portion 120 has a threaded portion 126 arranged to be screw-fastened in a treaded recess in a hydraulic Chamber, whereby the sensor 100is removeably attached to the hydraulic Chamber.
    The body 122 Comprises a plurality of recesses 128 in which anadapter 200, see Fig. 3, for fixation of the sensor is removeably attachablesuch that a sufficient rotational force is obtained during the attachment of thesensor 100 in a hydraulic Chamber. Moreover, the plurality of recesses 128are arranged such that the housing 102 may be positioned in a predetermined relation with the outside circuitry and/or such that the adapter 200 used for 8 fastening the sensor 100 in the hydraulic Chamber is removably engageableto the housing 102.
    A person skilled in the art realizes that other geometries or means forfixation of the sensor 100 is also possible.
    The body 122 of the sensor 100 is advantageously made of a metalsuch as stainless steel to provide a strong and robust housing 102 thatmechanically protects the interior parts of the sensor 100. Such a design isalso favorable when fastening the sensor 100 in the hydraulic Chamber. Thehousing 102 is advantageously sealed in order to prevent liquids and othermedia to enter the interior volume of the sensor 100. To fixate and/or protectthe parts within the sensor 100 from vibration, moisture and corrosive agentsthe interior volume of the housing 102 is preferably filled with electrical pottingCompounds and encapsulation materials such as epoxy, silicone or polymersystems.
    A person skilled in the art realizes that other materials may be used forthe housing 102 of the sensor 100 as well as for the encapsulation. Nonlimiting examples of material that may be used are a ceramic or a plastic.
    The end section 124 is further penetrable to radio signals as will bediscussed below. The plurality of Contacts 114 are preferably arranged (notshown) such that a portion of each of the Contacts is extending through theend section 124 of the housing 102 such that the plurality of Contacts 114may be brought in galvanic contact with outside circuitry. ln this embodimentthe end section 124 is made of epoxy which is penetrable to radio signals andvisually transparent. The usage of a visually transparent epoxy providesvisual indication means, for example via a light emitting diode, giving efficientaccess to information pertaining to the status of the sensor 100. The visualindication may provide the Charge level of the battery. lt should be noted thatthe end section 124 could in another embodiment Consist of a glass, aceramic or a plastic material, being penetrable to radio signals. The endsection 124 may comprise a visually opaque material as long as the material of the end section 124 is penetrable to radio signals. 9 ln order to efficiently use the volume within the housing 102 thecircuitry 106 is preferentially made flexible such that the circuitry 106 isfoldable around the battery 108. lt is further advantageous if the wireless communication unit 110comprises a flexible antenna 112 for transmitting and/or receiving radiosignals.
    According to one embodiment the antenna 112 is integrated in a flex-rigid printed circuit board (PCB) which is arranged such that the antenna 112is brought in close proximity of the end section 124 of the housing 102. Thisimproves the efficiency of the antenna 112. For example, the antenna 112may be glued to the end section 124. ln an alternative embodiment is the antenna 112 is a wire antenna.
    The adapter 200 for fixation is schematically illustrated in Fig. 3. ln thedisclosed embodiment an end portion of the adapter 200 for fixation is shapedas a hexagonal nut 202. lt should be noted that the end portion of the adapter200 for fixation may be of any shape, such as comprising a notch, a knurlednut, or a T-nut, as long as an efficient attachment of the sensor 100 in thehydraulic chamber is provided. The adapter 200 for fixation further comprisesedge portions 204 arranged such that they fit into the plurality of recesses 128on the housing 102 of the sensor 100. An advantage of having the plurality ofrecesses 128 on the housing 102 of the sensor 100 is that the amount ofhousing material close to the end section 124 is reduced. The materialreduction reduces the shielding of signals to and/or from the antenna 112 andthe wireless communication unit 110 of the sensor 100. Hence, an improvedefficiency of the wireless communication unit 110 in communicating data toand/or from the sensor 100 is obtained during the usage of the sensor 100. ltshould however be noted that in another embodiment the body 122 maycomprise edge portions and the adaptor 200 for fixation may comprisecorresponding recesses.
    With reference to Fig. 4 an embodiment of the circuitry 300 of thesensor 100 according to the present invention is described. The circuitry 300comprises a plurality of contacts 302 denoted C1 - G5, a switch 304, a battery 306, and a plurality of resistors R1 - R2. The switch 304 is arrangedto switch between a first state and a second state. ln the first state the switch304 is in a position A such that the potential of contact C1 is set to ground viathe resistor R1. A potential V on contact G2, preferable between 3 - 5V,switches the switch 304 to a position B, such that the circuitry 300 is in thesecond state. lt should be noted that if no potential is applied to contact G2,the potential of contact C2 is set to ground via the resistor R2. The contactsC3 - C5 are set to ground. Hence this circuitry 300 is, depending on the inputpotential on C2, switched between the first state and the second state. ln thefirst state the plurality of contacts 302 are set to have the same electricalpotential. ln the second state the circuitry 300 is arranged such that contactC1 is set to have a different electrical potential relative to the contacts C32 -C5. The second state is therefore arranged such that the battery 306 and thecontact C1 are in electrical connection, which provides efficient charging ofthe battery 306. lt should be noted that the switch 304 further connects the circuitry 300via Vpowe, in order to power the sensor 100. By this arrangement the power forthe sensor 100 is turned off during charging, during which the battery 306 isconnected to the contact C1. This is advantageous as better control of thecharging of the battery 306 is obtained and that the energy consumption ofthe sensor is minimized when the charging of the sensor 100 is terminated.The sensor 100 may be reset as the sensor 100 is removed from a Charger,i.e. a hardware reset. The processing unit 310 may before or after the resetread data from and/or write data to the memory 118. The sensor 100 mayfurther be arranged such that it is powered after being removed from thecharger such that it is in a low power mode that requires initiation (WAKE UP)by the key circuitry 500. The WAKE UP procedure reduces the powerconsumption of the sensor 100.
    According to this embodiment of the sensor 100, the circuitry 300further comprises a thermistor 308 which is electrically connected to thecontact C3 and becomes biased during the charging of the battery 306. Theresistance of the thermistor 308 varies substantially with temperature. By 11 piacing the thermisor 308 in vicinity of the battery 306 Variations in thetemperature of the battery 306 is detected. if for exampie the temperature ofthe battery 305 is outside a predetermined temperature intervai the chargingof the battery 300 is terminated. This improves the efficiency of the chargingof the battery 305 and reduces the risks of the battery 305 being overheated.A longer iifetime of the battery is thereby obtained.
    The circuitry 300 comprises a processing unit 310 and a filter 312, bothbeing in eiectricai connection with contacts 04 and 05. The processing unit310 is arranged such that a potentiai appiied on 04 initiates the processorunit 310, in a so caiied “WAKE UP” procedure. The filter 312 together with avoltage dependent resistor (VDR) 314 is provided to fiiter out spurious signaissuch as eiectrostatic discharges that for instance may initiate the processingunit 310. The circuitry 300 is thereby aiso arrangerat to short circuit highvoitages to ground in order to protect the processing unit 310. The processingunit 310 may comprise a 002530 chip.
    Contact G5 is connected to ground and thereby to the battery 300.
    The outside circuitry according to the present invention may forinstance comprise key circuitry 500 or Charger circuitry 000 as wili bedescribed in the foiiowing.
    Fig. 5 shows key circuitry 500 arranged to, via the processing unit 310,initiate the sensor 100 in an excitation/initiation procedure often referred to asa “WAKE UP" procedurer The key circuitry 500 comprises a battery 502, aresistor 504, and the contacts G4' and C35. The battery 502 is preferabiy asilver oxide battery which provides a long iifetime ot the key circuitry 500. Theresistor 504 is matched to the processing unit 310 and arranged such that it isconnected in series with a digital input of the processing unit 310. This isadvantageous as the key circuitry 500 may initiate or “VVAKE UP" the sensor100 even if the potentiai of the battery is substantiaily reduced from its fuiiycharged ievei. The resistor 504 aiso reduces the short circuit currentoccurring in the circuitiy 500 in case of a short circuit, which protects thecircuitry 500 from damage. The contacts G4' and G5” are arranged such that they may be brought in gaivanic contact with the contaots 04 and G5 of the 12 circuitry 300, respectively. Hence efficient electrical contacts between thecircuitry 300 and the key circuitry 500 are achieved.
    Fig. 6 shows charger circuitry 600 of a charger arranged to charge thecircuitry 300 of the sensor 100. The charger circuitry 600 comprises a powersource 602, a micro switch 604, a processing unit 606, a plurality of indicators608, and a plurality of contacts 610 (C1”, G2", G3", 05"). The power source602 is arranged to power the charger circuitry 600 and the charging of thebattery 306. The power source 602 may comprise a battery, a chargeablebattery, a USB connection providing the desirable voltage for operating thecharger or some other suitable power source. The micro switch 604 isswitchable between a conducting and a non-conducting state. The microswitch 604 is arranged such that the charger circuitry 600 is powered whenthe micro switch 604 is set to a conducting state. This could for instanceoccur when at least a part of the sensor 100 is brought in contact with thecharger. The contact is preferable a galvanic contact.
    The processing unit 606 comprises logics and circuitry arranged tocharge a chargeable battery such as a Iithium battery. The potentials used forinitiating the charging (switching the switch 304) and the charging of thebattery 306 are provided by the processing unit 606 and applied via thecontacts C1” and G2”. The processing unit 606 is further arranged to viacontact 03" and the thermistor 308 access the temperature of the battery 306during charging. This provides as discussed above efficient charging of thebattery.
    The processing unit 606 may be a BQ24040DSQT.
    The plurality of indicators 608 are connected to the processing unit606, and are arranged such that they indicate the status of the chargercircuitry 600. lt is thereby easy to visually determine for example if the powerfrom the power source 602 is sufficient for charging the battery 306, if thecharging of the battery is ongoing or finished etc.
    The plurality of contacts 610 (C1”, G2", C3", 05") are arranged suchthat they may be brought in galvanic contact with the contacts C1, C2, G3 and 13 C5 of the circuitry 300, respectively. Hence, efficient electrical contactsbetween the circuitry 300 and the charger circuitry 600 are achieved.
    The charger circuitry 600 may further comprise a plurality of resistors612, the resistance of which determines the currents used during charging ofthe battery 306. lt is thereby possible to for example set the maximum currentand the minimum current used during the charging, which reduces risks ofoverheating the battery 306 or other damages to the battery 306 or thecircuitry 300 that may occur as a consequence of too large currents flowing inthe circuitry 300. This arrangement also improves the lifetime of the battery306.
    The person skilled in the art realizes that the present invention by nomeans is limited to the preferred embodiments described above. On thecontrary, many modifications and variations are possible within the scope ofthe applied claims.
    For example, the person skilled in the art realizes that the sensor maybe used for measuring pressures other than a hydraulic pressure.
    The switch 304 may also be a single-pole/double-throw monolithicCMOS analog switch or a MOSFEET.
    The sensor 100 may comprise a first temperature gauge arranged tosense the temperature in the hydraulic chamber. A second temperaturegauge is preferable arranged outside the pressure chamber. Thisarrangement allows for measurements of the relative temperature pertainingto the temperature measured with the first and the second temperaturegauges, respectively. An advantage being that a more reliable and efficienttemperature measurement may be obtained.
    The wireless communication unit 110 is further arranged to via theantenna 112 transmit and/or receive radio signals. This allows for instance forcommunication between individual sensors, with a receiver unit and or acontrol unit. The receiver may comprise a processing unit and acommunication unit for transferring data to and from the sensors 100. Thereceiver may be understood as a repeater or an amplifier of the radio signals in order to improve the data transfer to and from the sensor 100. lt is 19 14 favorabie to arrange a receiver in the vicinity of a sensor 190 in environmentssuch as a machine tooi oomprising metais and other materiais that mayinterfere or shieid the radio signais to and from the sensor. There may be areceiver assigned to each of the sensors or a receiver assigned to a piuraiityof sensors 190. The oontroi unit may cornprise a dispiay for dispiaying datapertaining to the hydrauiio pressure in the hydrauiio Chamber as sensed bythe sensor. The oontroi unit may further be arrahged to communicate with theprocessing unit 116, 399 of the sensor.
    The battery 396 may be a chargeabie iithium battery.
    Additionaiiy, Variations to the disoiosed embodiments oan beunderstood and effeoted by the skiiied person praotioing the ciaimedinvention, from study of the drawings, the disciosure, and the appendecioiaims. Moreover, in the drawings and speoifications, there have beendisoiosed preferred embodiments and exarnpies of the invention and,aithough specific term are empioyed, they are used in a generic anddescriptive sense oniy and not for the purpose of iirnitation, the soope of theinvention being set forth in the foiiowing oiairns. in the olairns, the word"comprising" does not exciude other eiements or steps, and the ihdefinite artioie ”a” or “an” does not exoiude a piuraiity.
    权利要求:
    Claims (11)
    [1] 1. A sensor (100) for measuring a hydrauiic pressure in a hydrauiic chamber,the sensor (100) comprising:a housing (102) having an end section (124) being penetrabie to radiosignals,a circuitry (100, 300) housed within the housing (102), the circuitry(106, 300) comprising:a pressure gauge (104) for measuring the hydrauiic pressure inthe hydrauiic chamber,a wireiess communication unit (110) arranged to communicatedata pertaining to the hydrauiic pressure in the hydrauiic charnber,a battery (108, 300), arranged to power the sensor (100),a piurality of contacts (114, 302) arranged to make gaivaniccontact with outside circuitry (500, 600),wherein the circuitry (100, 300) is arranged to be switchabie between afirst state and a second state, wherein in the first state the oirouitry (106, 300)is arranged such that the piuraiity of contacts (114, 302) are set to have thesame eiectricai potentiai and in the second state the circuitry (106, 300) isarranged such that at ieast a first one of the piuraiity of contacts (114, 302) isset to have a different eiectrioai potential reiative to a second one of thepiuraiity of contacts (t 14, 302).
    [2] 2. A sensor (100) according to ciaim 1, wherein the battery (103, 306) ischargeabie and wherein the piuraiity of cohtacts (114, 302) are arranged tornake gaivanic contact with the outside circuitry (500, 000) such that chargingof the battery (108, 306) is rnade possibie.
    [3] 3. A sensor according to oiairn 1 or 2, wherein the oircuitry (106, 300) isfiexibie such that the circuitry (100, 300) is foidabie around the battery (103, soc). 16
    [4] 4. A sensor (100) according to claims 1 - 3, wherein the wirelesscommunication unit (110) further comprlses a flexible antenna (112) for transmitting and/or receiving radio signals.
    [5] 5. A sensor (100) according to claim 4, wherein the antenna (112) is arranged in close proximity to the end section (124) of the housing (102).
    [6] 6. A sensor (100) according to claims 1 - 5, wherein the end section (124) of the housing (102) is made of a glass, a ceramic or a plastic material.
    [7] 7. A sensor (100) according to claim 1 - 6, wherein the housing (102)comprises a threaded portion (126) for fastening the sensor (100) in the hydraulic chamber.
    [8] 8. A sensor (100) according to claim 1 - 7, wherein the housing (102)comprises a plurality of recesses (128) arranged such that the housing (102)may be positioned in a predetermined relation with the outside circuitry (500,600) and/or such that an adapter (202) used for fastening the sensor (100) inthe hydraulic chamber is removably engageable to the housing (102).
    [9] 9. A sensor (100) according to claims 1 - 8, wherein the housing (102) is at least partly made of a metal.
    [10] 10. A sensor (100) according to claim 1 - 9, wherein the switching of thecircuitry (106, 300) is initiated by the outside circuitry (500, 600).
    [11] 11. A sensor (100) according to claim 1 - 10, wherein the contacts (114, 302)are arranged such that a portion of each contact (114, 302) is extendingthrough the end section (124) of the housing (102).
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    同族专利:
    公开号 | 公开日
    SE537096C2|2015-01-07|
    WO2015050489A1|2015-04-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE29615534U1|1996-09-06|1996-10-24|Dbt Gmbh|Pressure transducer for measuring hydraulic pressures, especially for mining applications|
    DE19834212A1|1998-07-29|2000-02-10|Siemens Ag|Control device in a motor vehicle and pressure sensor used by this|CN105241603B|2015-11-02|2018-08-07|贵阳博烁科技有限公司|A kind of water supply network pressure monitoring terminal and monitoring system|
    JP6776143B2|2017-02-03|2020-10-28|横河電機株式会社|Water level measurement system|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1351160A|SE537096C2|2013-10-02|2013-10-02|Wireless sensor for measuring hydraulic pressure|SE1351160A| SE537096C2|2013-10-02|2013-10-02|Wireless sensor for measuring hydraulic pressure|
    PCT/SE2014/051085| WO2015050489A1|2013-10-02|2014-09-23|Wireless sensor for measuring a hydraulic pressure|
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