WO2011155893A1 - Système de capteur capacitif - Google Patents

Système de capteur capacitif Download PDF

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Publication number
WO2011155893A1
WO2011155893A1 PCT/SE2011/050697 SE2011050697W WO2011155893A1 WO 2011155893 A1 WO2011155893 A1 WO 2011155893A1 SE 2011050697 W SE2011050697 W SE 2011050697W WO 2011155893 A1 WO2011155893 A1 WO 2011155893A1
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WO
WIPO (PCT)
Prior art keywords
signal
capacitive sensor
vehicle
sensor
generating
Prior art date
Application number
PCT/SE2011/050697
Other languages
English (en)
Inventor
Peter Sundell
Fredrich Claezon
Original Assignee
Scania Cv Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=45098306&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2011155893(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Scania Cv Ab filed Critical Scania Cv Ab
Priority to EP11792746.7A priority Critical patent/EP2577868A4/fr
Priority to BR112012030047A priority patent/BR112012030047A2/pt
Priority to CN2011800281029A priority patent/CN102939718A/zh
Priority to KR1020127033735A priority patent/KR20130041830A/ko
Priority to RU2012157294/08A priority patent/RU2012157294A/ru
Publication of WO2011155893A1 publication Critical patent/WO2011155893A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/1004—Alarm systems characterised by the type of sensor, e.g. current sensing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/102—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device a signal being sent to a remote location, e.g. a radio signal being transmitted to a police station, a security company or the owner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation
    • G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945—Proximity switches
    • H03K17/955—Proximity switches using a capacitive detector

Definitions

  • the present invention comprises a system for detecting, for example, pedestrians and cyclists in the vicinity of a vehicle.
  • the technology is based on the use of capacitive sensor elements which make it possible to create invisible zones outside the vehicle in which the detection of pedestrians and cyclists becomes possible.
  • the invention is also applicable to achieving shell protection with boosted monitoring zones of the vehicle.
  • a closely related field is breaking into and theft from trucks, trailers and semitrailers, which has now become a substantial problem due to the relatively unprotected way in which valuable goods are currently transported by road. Such thefts and break- ins cause substantial costs to hauliers and insurance companies. They also contribute to drivers feeling unsafe when sleeping in trucks. Locking systems and alarm systems are commonly used to protect vehicles from break- ins and thefts but today's systems have limitations which make it difficult to achieve satisfactory protection. There is currently no good solution for monitoring of selected zones round trucks, trailers and semitrailers. A problem with trailers and semitrailers is that they need to be equipped with sensors for the monitoring and that they have to be integrated with the tractor unit's monitoring system.
  • WO-2008/1210141 relates to a monitoring and communication system for a vehicle, particularly for a long vehicle.
  • Lamp units on the vehicle e.g. warning lamps and position lamps, are provided with monitoring sensors and communication units to wirelessly convey output signals from the sensors to a central unit.
  • Each sensor defines a monitoring zone for detection of objects or movements within the monitoring zone.
  • the sensors may for example be ultrasound sensors, Doppler sensors or radar sensors.
  • WO-2008/121041 refers to solving the problem of how the sensors for monitoring a vehicle communicate with one another, particularly in the case of long vehicles, and this solution involves using a wireless network which is easy to supplement by further lamp units situated, for example, on semitrailers.
  • a disadvantage of the solution according to WO-2008/121041 is that it is relatively expensive in that components and technology need adapting to the tractor unit's monitoring system.
  • US-2006/0250230 refers to a method for operation of a monitoring and alarm device for parked vehicles.
  • the device comprises a sensor unit for determining the distance between the vehicle and an approaching object within an active zone, and a reaction device which is connected to a control unit and is activated when the object comes close to the vehicle.
  • the active zone is divided into at least an outer first subzone and an inner second subzone.
  • the reaction device is activated progressively with regard to quantity, type, density and/or sequence in the first subzone as compared with its activation with regard to quantity, type, density and/or sequence in the second subzone.
  • US-2007/0205775 refers to a device for capacitive determination of the location of an object by a plurality of capacitive probes distributed on a surface and intended to determine the location of the object relative to the surface.
  • each probe is connected to a voltage source via coupling capacitances and can be supplied with a supply voltage, and an evaluation device is provided and is connected to the probes to convert the probe signals to an output signal which serves as a measure of the location of the object.
  • a capacitive proximity sensor is within a category of sensors called proximity sensors which detect objects without touching them. Other proximity sensors are photoelectric and inductive proximity sensors. The capacitive proximity sensor detects objects on the basis of their dieletric properties and has many areas of application which utilise this characteristic.
  • the main component of a capacitive proximity sensor is a capacitor plate, i.e. half of a capacitor.
  • a capacitor comprises two conductive plates separated by dielectric material. A voltage difference applied to these plates creates an electrical field across the dielectric material. This electrical field stores the electrical charges, and if the energy source is switched off the electrical field will collapse and release its energy in the form of a voltage which drops asymptotically towards zero from its initial level.
  • the capacitor's ability to store charges is called capacitance and is measured in farads, the amount of which depends on the cross-sectional area of the capacitor plates, the distance between them, and the dielectric constant of the dielectric material.
  • Water has a very high dielectric constant of about 80, whereas air has a low constant of about 1. Most materials have constants between these values.
  • a capacitive sensor is thus half of a capacitor, i.e. a capacitor plate.
  • An object passing in front of the plate serves both as the second capacitor plate and as the dielectric material, and the capacitive sensor measures the capacitance resulting from this situation. Any such object whose dielectric constant differs from the constant for air can be detected, at least at short distances.
  • a measuring device may then be provided to measure the change in the capacitance and may have predetermined threshold values set, e.g. based on the distance between the object and the plate.
  • FIG. 1 depicts schematically an example of a capacitive sensor device comprising an oscillator to which a DC voltage is applied and which delivers an AC current to a capacitor plate via a current sensor.
  • the capacitor plate may retain a charge since, when a plate has been charged positively, negative charges are attracted to the second plate, making it possible for still more positive charge to be supplied to the first plate. Provided that both plates are present and are close to one another, it is very difficult to cause one of them to carry a large charge.
  • the capacitive sensor thus comprises only one of the plates and the AC current can only supply current to, or carry current away from, this plate if there is in the vicinity another plate which may have an opposite charge.
  • the object to be detected serves as the second plate. If the object is close enough to the sensor plate to be affected by the latter's charge, it will acquire an opposite charge, and current can be supplied to, and be carried away from, the sensor plate and be measurable by the current sensor.
  • capacitive sensors When capacitive sensors are used to detect objects round a vehicle, some of the disadvantages of these sensors are less important, e.g. the fact that they are not directionally sensitive.
  • a practical system will have many sensors distributed at regular intervals along the outside of the vehicle. This means that there will always be a sensor near to the object, with the result that a relatively limited reach will be sufficient and an object can always be located by the sensor, and by the location of the sensor which detects the object.
  • the capacitive sensor measures a certain capacitance from objects in the surroundings which are always present and are therefore irrelevant.
  • the sensor detects the vehicle itself and the external earth.
  • Unknown objects are detected as an increase in this background capacitance.
  • the change in capacitance is smaller by a number of powers of ten, and far smaller than the background capacitance. This background capacitance has to be determined so that it can be subtracted from the measurement.
  • the background capacitance is substantial relative to the capacitance of the object and is also subject to drift, it is far simpler to use the sensor for detecting the change in the surroundings than to detect the absolute presence or absence of an unknown object.
  • the magnitude of the change in the background capacitance depends on how stable the surroundings are. In a mode of use which detects change, the sensor is not to be regarded as a detector of presence but rather as a detector of change of presence.
  • the object of the present invention is to propose a sensor system which is simple and inexpensive to install both on trucks and on buses and which in particular improves safety in that the possibility of detecting persons, cyclists and pedestrians in the vicinity of the vehicle is enhanced.
  • the invention thus comprises a capacitive sensor system for a vehicle, which system comprises a signal generator, a signal detector and a processing device.
  • the sensor system further comprises an earth antenna adapted to serving as a virtual external earth for the system, connected electrically to the signal generator and so disposed on the vehicle that it is electrically insulated from the vehicle's chassis, has a predetermined size and is situated a predetermined distance from the ground surface.
  • the system further comprises at least two capacitive sensor elements which each define a detection zone and are disposed galvanically separate from the vehicle's chassis,
  • a selector device intended to connect said capacitive sensor elements according to a predetermined detection configuration depending on a control signal applied to the selector device
  • the signal generator is adapted to generating a sensor signal with a frequency and an amplitude and to applying it between each connected capacitive sensor element and the external virtual earth.
  • the signal detector is adapted to detecting and determining a measure of the voltage between them and to generating a measurement signal based thereon which is conveyed to the processing device.
  • the processing device is adapted to processing the measurement signal and conveying the processed measurement signal to an alarm system which is adapted to generating one or more alarm signals on the basis of the processed measurement signal.
  • the capacitive sensor system according to the invention is particularly suited to detecting a road user, cyclist or pedestrian who comes near to the truck or the semitrailer and who thereby contributes to an increased capacitance relative to the ground.
  • the result is an increased voltage split and a consequent change in the measurement signal from the sensor element which has detected the road user.
  • the capacitive sensor system further makes it possible to detect intrusions in zones which the sensor elements create around the vehicle.
  • the sensor system may for example be connected to the vehicle's monitoring system which produces alarms by means of, for example, light or sound or via telematics. This technology protects portions of the vehicle along with any trailer or semitrailer fitted with sensor elements.
  • Sensor elements may be used not only to determine the location of cyclists/pedestrians but also for shell alarms and movement alarms in selected zones round the vehicle.
  • Warning signals may be adapted to cater for different zones and distances.
  • Figure 1 depicts schematically an example of a capacitive sensor device.
  • Figure 2 is a schematic diagram of a truck with semitrailer on which the present invention is implemented.
  • Figure 3 is a block diagram of the capacitive sensor system according to the present invention.
  • Figure 4 is a diagram illustrating measurement signals according to the present invention.
  • Figure 5 depicts the front of a truck provided with sensor elements according to the present invention.
  • Figure 6 is a schematic diagram of a truck illustrating various measurement zones effected according to the present invention.
  • FIG. 2 is a schematic diagram of a truck with semitrailer on which the present invention is implemented.
  • the capacitive sensor system comprises a signal generator, a signal detector and a processing unit, jointly designated as ref. 1, connected to at least two sensor elements 7, three in the diagram, and to a virtual earth 3 via an earth antenna 4.
  • the vehicle's chassis earth is any desired earth point of the vehicle's chassis.
  • the capacitive connections of the earth antenna and the sensor elements to the ground surface are represented by broken lines.
  • the earth antenna 4 is for example a plate or cable situated close to the ground (the external earth).
  • the earth antenna is adapted to being fitted on the underside of the vehicle and comprises for example a metal plate with a planar surface, this being essential, which is fitted horizontally on the underside of the vehicle, e.g. on the underside of its fuel tank.
  • the size of the antenna in this form has to be at least about 1 m 2 to achieve desired sensitivity for the system, particularly when implemented on a truck with semitrailer. Other locations on the underside of the vehicle are of course also possible.
  • the earth antenna may also comprise a plurality of plates electrically connected together.
  • the earth antenna takes the form of at least a portion, or the whole, of the vehicle's fuel tank.
  • the chassis earth has a capacitance for the truck of the order of several nF, whereas the antenna plate (earth antenna 4) may have a capacitance to the ground of the order of two powers of ten less, i.e. of the order of 10 pF (0.01 nF).
  • the earth antenna 4 should preferably have a capacitance to the ground which is as large as possible.
  • the earth antenna has a surface of at least 1 m 2 and preferably about 1.5 m 2 .
  • the output signal from the processing unit is a reference value generated by measuring the potential difference AV between the respective sensor elements 7 and the external earth 3, and its potential changes when an object 5 (e.g.
  • the processing device then communicates the proximity of the road user or the intrusion, e.g. electrically or wirelessly, to the vehicle's monitoring system 6 (or alarm system), which triggers an alarm appropriate to the situation detected.
  • the vehicle's monitoring system 6 or alarm system
  • the invention is described below with reference to Figure 3, which is a block diagram of the capacitive sensor system according to the present invention.
  • the capacitive sensor system for a vehicle thus comprises a signal generator, a signal detector and a processing device.
  • the system further comprises an earth antenna adapted to serving as a virtual external earth for the system, electrically connected to the signal generator and so disposed on the vehicle that it is electrically insulated from the vehicle's chassis, has a predetermined size and is situated a predetermined distance within the range of 0.3-0.8 m from the ground surface.
  • At least two capacitive sensor elements are provided, each defining a detection zone (zone 1, zone 2, zone n), and are disposed galvanically separate from the vehicle's chassis.
  • the capacitances which the respective sensor elements 1-n represent relative to the external earth are designated C21, C22, C23 to C2n.
  • a selector device a multiplexer (MUX) is provided and is intended to connect said capacitive sensor elements according to a predetermined detection configuration depending on a control signal applied to the selector device.
  • the control signal may for example be generated by a superordinate control system (not depicted).
  • the signal generator is adapted to generating a sensor signal with a frequency and an amplitude and to applying it between each connected capacitive sensor element and the virtual external earth.
  • the signal detector is further adapted to detecting and determining a measure of the voltage between each connected sensor element and the virtual external earth and to generating a measurement signal based thereon which is conveyed to the processing device.
  • the processing device is adapted to processing the measurement signal and to conveying the processed measurement signal to an alarm system (or monitoring system) which is itself adapted to generating one or more alarm signals on the basis of the processed measurement signal.
  • the signal generator is adapted to generating a sensor signal with a frequency which is preferably within the range 2-20 kHz and which has an amplitude within the range 2-20V, more preferably a sensor signal with a frequency of about 10 kHz and an amplitude of about 10 V. Sensor signals which have a frequency and an amplitude outside these values may of course be used.
  • a preferred embodiment involves so-called frequency hopping technology, i.e. frequency change according to a specific pattern.
  • the processing unit processes the measurement signal from each sensor element by determining the derivative for the signal, and according to another embodiment the processing unit processes the signal by generating an absolute value for the signal. According to further another embodiment, the processing unit processes the measurement signal by amplifying it and generating an absolute value for the
  • the processing unit processes the measurement signal by determining the derivative for the change in the measurement signal. More complicated forms of processing of the measurement signal are also possible, e.g. the difference in level between two different sliding mean values for the signal may be determined, viz. a slow one which adapts to external circumstances and a fast one which is the measurement signal itself.
  • the difference in amplitude (A) is indicated by a double arrow, and the derivative for each signal. Comparing the difference in amplitude and/or the difference in derivative at the same point in time with appropriate threshold values results in rapid and reliable detection.
  • the alarm system is thus adapted to comparing the measurement signal, or parameters which depend on the measurement signal, e.g. according to the method described above in which amplitude difference, and/or the difference in derivative, from each sensor element is compared with one or more threshold levels which are unique to the respective sensor elements, and to generating one or more alarm signals on the basis of that comparison.
  • the alarm signal or signals generated have to be interpreted generally and may mean, according to one application, that the driver is made aware of a pedestrian or cyclist who is close to the vehicle at a certain location which is indicated.
  • the alarm signal or signals may mean that an unauthorised person is approaching the vehicle while it is parked, and that he/she is approaching from a particular direction indicated by a sensor element which monitors specifically that direction.
  • Connecting the capacitive sensor elements thus involves use of the selector device which according to a detection configuration connects them.
  • the detection configuration comprises points in time and durations for connection of the respective sensor elements. This is effected preferably with a frequency within the range 20-100 Hz, i.e. each sensor element is connected within the range 10-50 ms. It is of course possible to adopt a connection frequency outside this range, depending on the particular application which is relevant within the scope of the present invention, i.e. frequencies lower than 20 Hz and higher than 100 Hz.
  • the durations of the connection times for different sensor elements may differ in length.
  • certain sensor elements may be connected more often, possibly those situated at the front of the vehicle. All this can be altered and set via the detection configuration.
  • the capacitive sensor elements have therefore to be galvanically insulated from the vehicle chassis and may take the form, according to a preferred embodiment, of an insulated electrical conductor arranged, for example, in loops so that an effective detector surface is formed.
  • the reach of the sensor element becomes greater but the zone covered by it becomes narrower than that of a sensor element which has the loops further apart from one another but which then has a shorter reach from a given number of loops.
  • one or more sensor elements may take the form of a vehicle part, e.g. portions of the front which are galvanically insulated from the vehicle chassis, the whole or portions of the bumper, or so-called underrun protections fitted along the vehicle's sides to prevent anything from making its way in under the vehicle.
  • one or more sensor elements are placed on particular portions of the vehicle which it is desired to protect, e.g. close to its fuel tank, batteries, xenon lamps, extra lamps or portions of the cab.
  • the sensor elements are generally made of electrically conductive material, e.g. ordinary electric cable or conductive paint, which may for example be placed on the inside of plastic parts on the outside of the cab where protection is desirable.
  • the ideal shape of the sensor elements is a flat disc of metal insulated from the vehicle's chassis.
  • the various types of sensor element here described all need to be electrically connected to the signal generator and the signal detector by an insulated cable. Certain parts of the cable have to be screened, e.g. where it passes through portions of the vehicle's chassis. To achieve optimum measurement results with regard to signal-to-noise ratio, the whole cable should preferably be screened.
  • Figure 6 is a schematic diagram of a truck illustrating various schematically depicted measurement zones Z1-Z6 created by the capacitive sensor system according to the present invention.
  • Measurement zone Zl comprises a region in front of the vehicle and preferably has a reach of the order up to about two metres. Measurement zones Z2 and Z3 on the right side of the vehicle may in certain applications be set for detection with higher sensitivity than the zones on the left side. The reason is that the driver's view on the right side of the vehicle is limited, which means for example that on bends to the right (in the case of traffic on the right with the driver sitting on the left in the vehicle) traffic hazard situations may occur with pedestrians and cyclists.
  • Figure 6 illustrates six different measurement zones but there is nothing to prevent the number of zones from being increased to achieve higher resolution in determining the location of road users in the vicinity of the vehicle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Traffic Control Systems (AREA)

Abstract

La présente invention a trait à un système de capteur capacitif destiné à un véhicule, lequel système comprend un générateur de signal, un détecteur de signal et un dispositif de traitement. Le système de capteur comprend en outre une antenne au sol conçue de manière à tenir lieu de masse extérieure virtuelle du système, qui est connectée électriquement au générateur de signal et qui est disposée sur le véhicule de manière à ce qu'elle soit électriquement isolée du châssis du véhicule, de manière à ce qu'elle ait une taille prédéterminée et de manière à ce qu'elle soit située à une distance prédéterminée de la surface du sol. Le système comprend au moins deux éléments de capteur capacitif qui définissent chacun une zone de détection et qui sont disposés de manière à être séparés de façon galvanique du châssis du véhicule, et un dispositif sélecteur destiné à connecter lesdits éléments de capteur capacitif conformément à la configuration de détection prédéterminée en fonction d'un signal de commande appliqué au dispositif sélecteur. Le générateur de signal est conçu de manière à générer un signal de capteur doté d'une fréquence et d'une amplitude et de manière à appliquer ce signal entre chaque élément de capteur capacitif connecté et la masse extérieure virtuelle, et le détecteur de signal est conçu de manière à détecter et à déterminer une mesure de la tension entre ces derniers et de manière à générer un signal de mesure en fonction de cette mesure qui est acheminé jusqu'au dispositif de traitement. Le dispositif de traitement est conçu de manière à traiter le signal de mesure et de manière à acheminer le signal de mesure traité jusqu'à un système d'alarme qui est conçu de manière à générer un ou plusieurs signaux d'alarme en fonction du signal de mesure traité.
PCT/SE2011/050697 2010-06-07 2011-06-07 Système de capteur capacitif WO2011155893A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP11792746.7A EP2577868A4 (fr) 2010-06-07 2011-06-07 Système de capteur capacitif
BR112012030047A BR112012030047A2 (pt) 2010-06-07 2011-06-07 sistema de sensor capacitivo
CN2011800281029A CN102939718A (zh) 2010-06-07 2011-06-07 电容性传感器系统
KR1020127033735A KR20130041830A (ko) 2010-06-07 2011-06-07 정전용량형 센서 시스템
RU2012157294/08A RU2012157294A (ru) 2010-06-07 2011-06-07 Система емкостных датчиков

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1050581A SE538226C2 (sv) 2010-06-07 2010-06-07 Kapacitivt sensorsystem
SE1050581-6 2010-06-07

Publications (1)

Publication Number Publication Date
WO2011155893A1 true WO2011155893A1 (fr) 2011-12-15

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ID=45098306

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2011/050697 WO2011155893A1 (fr) 2010-06-07 2011-06-07 Système de capteur capacitif

Country Status (7)

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EP (1) EP2577868A4 (fr)
KR (1) KR20130041830A (fr)
CN (1) CN102939718A (fr)
BR (1) BR112012030047A2 (fr)
RU (1) RU2012157294A (fr)
SE (1) SE538226C2 (fr)
WO (1) WO2011155893A1 (fr)

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WO2016135218A1 (fr) 2015-02-26 2016-09-01 Universite De Reims Champagne-Ardenne Dispositif de detection et d'analyse de la nature d'obstacles

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CN105389960B (zh) * 2015-11-16 2018-01-16 上海斐讯数据通信技术有限公司 一种坐姿检测装置、系统及方法
LU100985B1 (en) * 2018-11-13 2020-05-13 Iee Sa System for Capacitive Object Detection

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US5394292A (en) * 1991-04-30 1995-02-28 Tsuden Kabushiki Kaisha Electronic car bumper
US20070205775A1 (en) * 2004-04-16 2007-09-06 Hardi Voelkel Device , Sensor Arrangement and Method for the Capacitive Position Finding of a Target Object

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US6469524B1 (en) * 2000-08-25 2002-10-22 Delphi Technologies, Inc. System and method for interrogating a capacitive sensor
GB2376075A (en) * 2001-06-01 2002-12-04 Ab Automotive Electronics Ltd Bumper proximity detector using capacitive sensor
GB2404443B (en) * 2003-07-28 2007-08-01 Automotive Electronics Ltd Ab Capacitive sensor
GB2423822A (en) * 2005-03-02 2006-09-06 Automotive Electronics Ltd Ab Capacitive proximity sensor with reduced sensitivity to water trickles
DE102005029503A1 (de) * 2005-06-24 2006-12-28 Siemens Ag Bedienelement mit Näherungssensor und Abschirmung
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Publication number Priority date Publication date Assignee Title
US5394292A (en) * 1991-04-30 1995-02-28 Tsuden Kabushiki Kaisha Electronic car bumper
US20070205775A1 (en) * 2004-04-16 2007-09-06 Hardi Voelkel Device , Sensor Arrangement and Method for the Capacitive Position Finding of a Target Object

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016135218A1 (fr) 2015-02-26 2016-09-01 Universite De Reims Champagne-Ardenne Dispositif de detection et d'analyse de la nature d'obstacles

Also Published As

Publication number Publication date
EP2577868A4 (fr) 2013-12-04
SE538226C2 (sv) 2016-04-12
EP2577868A1 (fr) 2013-04-10
RU2012157294A (ru) 2014-07-20
BR112012030047A2 (pt) 2016-08-09
SE1050581A1 (sv) 2011-12-08
CN102939718A (zh) 2013-02-20
KR20130041830A (ko) 2013-04-25

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