DE102012012865A1 - Capacitive sensor for a collision protection device - Google Patents

Capacitive sensor for a collision protection device

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Publication number
DE102012012865A1
DE102012012865A1 DE201210012865 DE102012012865A DE102012012865A1 DE 102012012865 A1 DE102012012865 A1 DE 102012012865A1 DE 201210012865 DE201210012865 DE 201210012865 DE 102012012865 A DE102012012865 A DE 102012012865A DE 102012012865 A1 DE102012012865 A1 DE 102012012865A1
Authority
DE
Germany
Prior art keywords
sensor
signal
electrode
transmission signal
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
DE201210012865
Other languages
German (de)
Inventor
Detlef Russ
Holger Würstlein
Ralf Daiminger
Florian Pohl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brose Fahrzeugteile SE and Co KG
Original Assignee
Brose Fahrzeugteile SE and Co KG
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
Application filed by Brose Fahrzeugteile SE and Co KG filed Critical Brose Fahrzeugteile SE and Co KG
Priority to DE201210012865 priority Critical patent/DE102012012865A1/en
Publication of DE102012012865A1 publication Critical patent/DE102012012865A1/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01VGEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS
    • G01V3/00Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
    • G01V3/08Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
    • G01V3/088Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices operating with electric fields
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05FDEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00Power-operated mechanisms for wings
    • E05F15/40Safety devices, e.g. detection of obstructions or end positions
    • E05F15/42Detection using safety edges
    • E05F15/46Detection using safety edges responsive to changes in electrical capacitance
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/945Proximity switches
    • H03K17/955Proximity switches using a capacitive detector
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K2217/00Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96Touch switches
    • H03K2217/9607Capacitive touch switches
    • H03K2217/960755Constructional details of capacitive touch and proximity switches
    • H03K2217/960775Emitter-receiver or "fringe" type detection, i.e. one or more field emitting electrodes and corresponding one or more receiving electrodes

Abstract

A capacitive sensor (2) for detecting an object, in particular for detecting a collision in the case of a moving vehicle part, is specified. The sensor (2) comprises an electrode arrangement (4) with at least one sensor electrode (6). The sensor (2) further comprises a signal generation circuit (7) connected upstream of the at least one sensor electrode (5) for generating a transmission signal (SE), the signal generation circuit (7) generating the transmission signal (SE) as a pulse signal with a trapezoidal or triangular temporal pulse shape.

Description

  • The invention relates to a capacitive sensor for detecting an object, in particular a body part of a person or an object, and to a collision protection device with such a sensor.
  • Capacitive sensors are used in vehicle technology, in particular in the context of a collision protection device. Such a collision protection device is generally used to detect an obstacle in an opening portion of a vehicle part, which is movable relative to a fixed frame between an open position and a closed position. In the - referred to below as "adjustment" - vehicle part is in particular a tailgate. Furthermore, the adjusting element to be monitored may also be a side door, a trunk or engine compartment flap, a sliding roof or a folding top. Collision protection devices are used in particular when the respectively associated adjusting element is moved by a motor.
  • The opening area is the space through which the adjustment element passes during an adjustment movement. The opening region of the adjusting element particularly includes the space region which is arranged between a closing edge of the adjusting element and a corresponding edge of the frame, against which the adjusting element rests in the closed position with its closing edge.
  • When closing adjusting elements of a vehicle, in particular a tailgate, there is often the risk that body parts or other objects between the closing edge of the adjusting element and the body are clamped. The collision protection device, which is also referred to as anti-pinch device in this application, serves to avoid such a trapping event and the resulting risk of personal injury and / or material damage by the collision protection device recognizing obstacles in the opening region and, in this case, stopping or reversing the closing movement.
  • Furthermore, a collision protection device can also be used to detect obstacles that are in the way of the opening of the adjustment element. Also in this application, the collision protection device stops or reverses the movement of the adjustment when it detects such an obstacle to avoid damage to property due to a collision of the adjustment with the obstacle.
  • A distinction is made between indirect and direct collision protection devices. An indirect collision protection device detects the collision case (in particular Einklemmfall) based on monitoring an operating variable of the adjusting element driving servomotor, in particular an abnormal increase in the motor current or an abnormal decrease in the engine speed.
  • By contrast, a direct collision protection device usually comprises one or more sensors which detect a measured variable which is characteristic for the presence or absence of an obstacle in the opening region, and an evaluation unit which uses this measured variable to decide whether an obstacle is present in the opening region and, if appropriate, triggers appropriate countermeasures. Among the direct collision avoidance devices, a distinction is again made between systems with so-called touch sensors, which only detect the presence of an obstacle when the obstacle already touches the sensor, and systems with contactless sensors, which detect an obstacle already at a certain distance from the sensor. Non-contact sensors include in particular so-called capacitive (proximity) sensors.
  • A capacitive sensor comprises an electrode arrangement with one or more electrodes, via which an electric field is built up in the opening region of the adjusting element. An obstacle in the opening area is detected by monitoring the capacitance of the electrode assembly. In this case, use is made of the fact that an obstacle, in particular a human body part, influences the electric field generated by the sensor, and thus the capacitance of the electrode arrangement.
  • In a conventional design of such a capacitive sensor, the electrode arrangement of this sensor comprises at least one transmitting electrode, which is connected to a signal generating circuit, and a receiving electrode, which is connected to a receiving circuit (transmitter-receiver principle). Such a sensor measures the capacitance formed between the transmitting electrode and the receiving electrode or a measured variable correlating therewith.
  • In an alternative design, the electrode arrangement of a capacitive sensor comprises only one sensor electrode or a plurality of similar sensor electrodes, which are acted upon by the transmission signal, and via which the capacity-dependent reception or response signal, for. B. in the form of the displacement current is detected (one-electrode principle). In such a sensor, a sensor external, lying at ground potential object is used as a counter electrode, in particular the body of the vehicle in which the sensor is installed. In such a sensor is thus as a measured variable detects the capacitance of the sensor electrode (s) to ground.
  • An intended for monitoring the opening area of a tailgate collision protection device or anti-trap device with a capacitive sensor is off DE 20 2007 008 440 U1 known.
  • As a transmission signal, a sinusoidal electrical alternating signal is usually used, which oscillates at a predetermined transmission frequency. Disadvantageously, the generation of such a sinusoidal signal requires a comparatively complicated circuit technique. Alternatively, a square-wave pulse signal is sometimes used as the transmission signal, which can be generated much less expensively by a simple switching element. However, such a rectangular pulse signal disadvantageously complies with a high harmonic content and is thus critical with respect to the electromagnetic compatibility (EMC) of the sensor.
  • The invention has for its object to provide an electromagnetically acceptable, but at the same time particularly simple capacitive sensor and a collision protection device with such a sensor.
  • With respect to the sensor, the above object is achieved by the features of claim 1. With respect to the collision protection device, the object is achieved by the features of claim 7. Advantageous embodiments and further developments of the invention are the subject of the dependent claims.
  • The sensor according to the invention comprises an electrode arrangement which comprises at least one sensor electrode. The sensor further comprises a signal generating circuit, which is connected upstream of the at least one sensor electrode and which serves to generate a transmission signal for this sensor electrode (s). According to the invention, the signal generation circuit generates the transmission signal as a pulse signal having a trapezoidal or triangular time pulse shape.
  • In this case, a triangular pulse form denotes a signal course in which the signal strength-in particular the electrical voltage-of the transmission signal in each pulse proceeds at least approximately linearly with time up to a maximum (or minimum) signal value, starting from a minimum (or maximum) signal value rises (or falls), and immediately thereafter at least approximately linearly decreases (or increases) with time to a minimum (or maximum) signal value.
  • In contrast, a waveform is referred to as a trapezoidal pulse shape in which the signal strength in each pulse rises (or decreases) from at least approximately linear with time to a maximum (or minimum) signal value a predetermined plateau time remains at least approximately constant, and only then decreases again at least approximately linearly with time up to a minimum (or maximum) signal value (or rises).
  • The transmission signal is preferably symmetrically offset with respect to a change of sign. In this case, in the case of a triangular pulse shape, the pulses adjoin one another directly in time, whereas in the case of the trapezoidal pulse shape, two consecutive pulses are separated by an interpulse time corresponding to the plateau time. In the context of the invention, however, the pulses of the transmission signal may also be separated by longer interpulse times.
  • The generation of the transmission signal as a triangular or trapezoidal pulse signal has the advantage that the transmission signal on the one hand - as a rectangular pulse signal - can be generated by simple switching. In contrast to a square-wave pulse signal, however, the transmission signal according to the invention again has the advantage that it has only comparatively weak harmonic components, which has a positive effect on the electromagnetic compatibility of the sensor.
  • The invention can basically be applied to capacitive sensors operating on the one-electrode principle, which sense the capacitance of their sensor electrode (s) to ground. Preferably, however, the sensor is a capacitive sensor which operates according to the transmitter-receiver principle. Accordingly, the electrode arrangement preferably comprises at least one transmitting electrode and at least one receiving electrode as sensor electrodes. The signal generating circuit is connected upstream of the at least one transmitting electrode.
  • In preferred dimensioning, the signal generation circuit generates the transmission signal in particular as a result of pulses whose edge rise time and / or flank descent time correspond to at least 1%, preferably at least 5%, in particular at least 10% of the total period duration. The period duration corresponds to the time that elapses between the start (or end) of a pulse and the beginning (or end) of the next pulse. The period duration thus includes the (temporal) pulse length as well as an optional interpulse time formed between two pulses.
  • In a particularly simple design, the signal generating circuit is essentially formed by a switching element and a downstream amplifier circuit. In this case, the switching element serves to generate a rectangular pulse signal which is converted by the amplifier circuit into the - triangular or trapezoidal - transmission signal. The amplifier circuit is limited in this case according to the desired pulse shape of the transmission signal, thus has a correspondingly low slew rate. In a preferred embodiment, the amplifier circuit is designed as an integrator.
  • In an expedient embodiment variant, the sensor comprises a microcontroller. In this case, a digital output of the microcontroller is preferably used as a switching element for generating the square-wave pulse signal.
  • The collision protection device according to the invention comprises a capacitive sensor of the type described above.
  • Hereinafter, embodiments of the invention will be described with reference to a drawing. Show:
  • 1 a block diagram of a jamming protection device for detecting and avoiding a Einklemmfalls in a movable vehicle part, comprising a capacitive sensor comprising a transmitting electrode, a receiving electrode, a transmitting electrode upstream of the signal generating circuit and a receiving electrode downstream of the receiving circuit
  • 2 in a simplified electrical circuit diagram, the structure of the signal generating circuit, which is formed here by a microcontroller with a serving as a switching element for generating a rectangular pulse voltage digital output and by a downstream integrator, and
  • 3 and 4 two variants of a means of the signal generating circuit according to 2 generated transmission signal.
  • Corresponding parts and sizes are always provided with the same reference numerals in all figures.
  • 1 shows a schematic representation of a anti-trap device 1 for a (not shown) movable adjusting a motor vehicle, in particular a motorized door or tailgate. The anti-trap device 1 includes a capacitive sensor 2 as well as a monitoring unit 3 ,
  • The sensor 2 is based on a capacitive measuring technique. The sensor 2 includes an electrode assembly 4 with at least one transmitting electrode 5 and at least one counter electrode or receiving electrode 6 , The electrode arrangement preferably comprises 4 (not shown) a plurality of transmitting electrodes 5 connected to a common receiving electrode 6 interact.
  • In operation of the sensor 2 is applied by applying an AC electrical voltage to the or each transmitting electrode 5 generates an (only indicated) electric field F in an opening region of the adjusting element, while on the receiving electrode 6 the (electrical) capacitance of the field-emitting transmitting electrode 5 and the receiving electrode 6 formed capacitor is detected.
  • In detail, the sensor includes 2 in addition to the electrode assembly 4 a signal generation circuit 7 , a receiving circuit 8th and a capacitance measuring element 9 ,
  • In operation of the sensor 2 generates the signal generation circuit 7 a transmission signal S E in the form of a pulse signal. The signal generation circuit 7 gives the transmission signal S E to the transmission electrode 5 which emits the electric field F under the effect of the transmission signal S E. If the sensor 2 several transmitting electrodes 5 is the signal generating circuit 7 and the electrode assembly 4 preferably a (not shown) time multiplexer interposed, the time of the transmission signal S E alternately to each one of the plurality of transmitting electrodes 5 gives.
  • Under the action of the electric field F is in the receiving electrode 6 generates an electrical alternating signal, which is hereinafter referred to as the received signal S R. The received signal S R is phase-synchronized with the transmission signal S E , thus has defined pulse edges between a high signal level and a low signal level, which coincide with the pulse edges of the transmission signal S E in time. In contrast to the transmission signal S E , the signal amplitude of the reception signal S R additionally varies depending on the capacitance to be measured.
  • The received signal S R is the receiving circuit 8th supplied as input signal. The receiving electrode 6 and the receiving circuit 8th Here, an optional (not explicitly shown) low-pass filter for pre-filtering the received signal S R is interposed. The receiving circuit 8th is designed for example as a transimpedance amplifier. In this embodiment, the receiving circuit 8th a - hereinafter referred to as received signal S R '- voltage signal from proportional to that under the effect of the transmission signal S E in the receiving electrode 6 induced displacement current. This received signal S R 'becomes that of the receiving circuit 8th downstream capacitance measuring element 9 fed, which generates a capacitance proportional measure K thereof.
  • The measurand K becomes that of the sensor 2 downstream monitoring unit 3 fed. The monitoring unit 3 , which is preferably formed by a microcontroller with a monitoring software implemented therein, compares the measured variable K with a stored tripping threshold value. If the threshold is exceeded, the monitoring unit outputs 3 a trigger signal A indicative of a possible Einklemmfall, and under the action of the movement of the anti-trap device 1 associated adjusting element is reversed.
  • The transmission signal S E is not an ordinary rectangular pulse signal but has a pulse signal with non-negligible temporal signal rise and fall regions, the signal value in these ranges changing at least approximately linearly over time. For generating this transmission signal S E comprises the signal generating circuit 7 according to 2 a microcontroller 20 and an electronic integrating circuit connected downstream thereof (hereinafter integrator 21 ). The integrator 21 in turn is formed by an operational amplifier 22 , an input resistance 23 , the inverting input of the operational amplifier 22 upstream, a coupling capacitor 24 over which the output of the operational amplifier 22 is fed back with the inverting input, as well as a coupling capacitor 24 parallel coupling resistor 25 , The non-inverting input of the operational amplifier 22 is placed on mass M.
  • The integrator 21 in turn is formed by an operational amplifier 22 , an input resistance 23 , the inverting input of the operational amplifier 22 upstream, a coupling capacitor 24 over which the output of the operational amplifier 22 is fed back with the inverting input, as well as a coupling capacitor 24 parallel coupling resistor 25 , The digital output 26 is used as a switching element for generating a rectangular pulse signal R by the microcontroller 20 under the effect of a control program implemented therein, the digital output 26 alternating in time (in particular periodically) between a high voltage value (eg +5 V) and a low voltage value (eg -5 V). The non-inverting input of the operational amplifier 22 is set to ground M (0 V) or another, lying centrally between the voltage values of the rectangular pulse signal R reference potential lying. The vertical, ie temporally instantaneous rise and fall edges of the rectangular pulse signal R are provided by the downstream integrator 21 to "oblique", ie time-linear rise and fall edges of the transmission signal S E ground. The slope of the signal value in the region of the rising and falling edges is due to the circuitry dimensioning of the integrator 21 established. In suitable dimensioning, for example, have the input resistance 23 an amount of 1 kΩ, the coupling capacitor 24 an amount of 100 nF and the coupling resistance 25 an amount of 1 MΩ.
  • The resulting signal form of the transmission signal S E can be determined by specifying the frequency, and thus the period P ( 3 ) of the rectangular pulse signal R are given. If this period duration P is selected to be greater than the two-fold edge rise time t R (FIG. 3 ) of the transmission signal S E , results for the transmission signal S E a trapezoidal pulse shape, the example in 3 is shown in a diagram of the transmission signal S E against the time t. Otherwise, the transmission signal S E takes an example in 4 shown, triangular pulse shape. The period P, with which the microcontroller 20 The square pulse signal generated by the microcontroller 20 implemented control program be predetermined. Alternatively, it may be provided that the period P - by parameterization of the control program or automatically in response to the microcontroller 20 supplied environment variable - variable (ie in the form of a program variable) is implemented.
  • How out 3 is recognizable, has in the case of a trapezoidal pulse shape each pulse 27 of the transmission signal S E a rising edge 28 , a garbage slope 29 and a plateau formed therebetween 30 on, where
    • - in the rising edge 28 the signal value of the transmission signal S E rises linearly from zero to a maximum value within the edge rise time t R ,
    • - in the plateau 30 the signal value remains constant at the maximum value for the duration of a plateau time t P , and
    • - within the waste side 29 the signal value within a flank decay time t F in turn falls linearly from the maximum value to zero over time.
  • The pulses 27 are each time symmetrical, so that the edge fall time t F of the edge rise time t R corresponds in size. The total pulse duration D thus results from the sum of the edge rise time t R , the plateau time t P and the edge fall time t F. Between every two successive pulses 27 is an interpulse time t I formed, which corresponds to the size of the plateau time t R , and in sum with the pulse duration D results in the period P.
  • As from the comparison of 3 and 4 is apparent, follows the triangular pulse shape of the transmission signal S E according to 4 from the trapezoidal pulse shape according to 3 for the special case that the plateau time t P and the interpulse time t I go to zero.
  • By appropriate design of the integrator 21 and in the microcontroller 20 implemented control program is ensured that the edge rise time t R and the edge fall time t F at least 10% of the period P correspond. In particular, it is provided that by correspondingly variable adjustment of the period P in the microcontroller 20 the ratio of the edge rise time t R or edge fall time t F can be selected to the period between 10% and 50%.
  • Although the invention will be particularly apparent from the embodiment described above, it is not limited thereto. Rather, other embodiments of the invention may be derived by those skilled in the art from the foregoing description. In particular, the microcontroller can 20 (or the control program implemented therein) and the integrator 21 be designed such that that of the signal generating circuit 7 output signal S E is asymmetrical in that the edge rise time t R can differ from the edge fall time t F and / or the plateau time t P from the interpulse time t I. Completely equivalent to the above description, the pulses 27 also be defined as negative pulses, in which case each pulse begins with a falling edge and ends a rising edge.
  • Notwithstanding the embodiment described above, in which the signal generating circuit 7 your own microcontroller 20 includes, the function of this microcontroller 20 also be integrated in the microcontroller of another device. In particular, it is provided in an expedient embodiment variant that the monitoring unit 3 and the signal generation circuit 7 share a common microcontroller.
  • Both in the case of the signal generating circuit 7 as well as in the case of the monitoring unit 3 Furthermore, the microcontroller can also be replaced by a non-programmable hardware circuit, for example an ASIC.
  • LIST OF REFERENCE NUMBERS
  • 1
    anti-trap
    2
    sensor
    3
    monitoring unit
    4
    electrode assembly
    5
    transmitting electrode
    6
    receiving electrode
    7
    Signal generating circuit
    8th
    Reception circuit
    9
    Capacity measuring element
    20
    microcontroller
    21
    integrator
    22
    operational amplifiers
    23
    input resistance
    24
    coupling capacitor
    25
    coupling resistor
    26
    Digital output
    27
    Pulse
    28
    leading edge
    29
    trailing edge
    30
    plateau
    t. F
    Edge fall time
    t i
    InterPuls time
    t p
    plateau time
    t R
    Flank attack time
    A
    trigger signal
    D
    pulse duration
    F
    (electric field
    K
    Capacity metric
    M
    Dimensions
    P
    period
    R
    Rectangular pulse voltage
    S e
    send signal
    S R
    receive signal
    S R '
    receive signal
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 202007008440 U1 [0011]

Claims (7)

  1. Capacitive sensor ( 2 ) for detecting an object, in particular for detecting a collision case in a movable vehicle part, - with an electrode arrangement ( 4 ), the at least one sensor electrode ( 6 ), - with one of the at least one sensor electrode ( 5 ) upstream signal generating circuit ( 7 ) for generating a transmission signal (S E ), wherein the signal generation circuit ( 7 ) generates the transmission signal (S E ) as a pulse signal having a trapezoidal or triangular temporal pulse shape.
  2. Sensor ( 2 ) according to claim 1, - wherein the electrode arrangement ( 4 ) as sensor electrodes at least one transmitting electrode ( 5 ) for emitting an electric field (F) under the action of the transmission signal (S E ) and at least one receiving electrode ( 6 ), and - wherein the receiving electrode ( 6 ) a receiving circuit ( 8th ) for processing in the receiving electrode ( 6 ) downstream of the generated received signal (S R ) under the action of the electric field (F).
  3. Sensor ( 2 ) according to claim 1 or 2, wherein the signal generating circuit ( 7 ) the transmission signal (S E ) as a result of pulses ( 27 ) with a period duration (P) and an edge rise time (t R ) and a. Flank descent time (t F ) generated, wherein the edge rise time (t R ) and / or the flank descent time (t F ) at least 1%, preferably at least 5%, in particular at least 10% of the period (P) correspond.
  4. Sensor ( 2 ) according to claim 3, wherein the signal generating circuit ( 7 ) a switching element ( 26 ) for generating a rectangular pulse signal (R) and a downstream amplifier circuit ( 21 ) for converting the rectangular pulse signal (R) into the transmission signal (S E ).
  5. Sensor ( 2 ) according to claim 4, wherein the switching element is a digital output ( 26 ) of a microcontroller ( 20 ) is used.
  6. Sensor ( 2 ) according to claim 4 or 5, wherein the amplifier circuit as integrator ( 21 ) is trained.
  7. Collision protection device ( 1 ) with a capacitive sensor ( 2 ) according to one of claims 1 to 6.
DE201210012865 2012-06-28 2012-06-28 Capacitive sensor for a collision protection device Pending DE102012012865A1 (en)

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Application Number Priority Date Filing Date Title
DE201210012865 DE102012012865A1 (en) 2012-06-28 2012-06-28 Capacitive sensor for a collision protection device

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DE201210012865 DE102012012865A1 (en) 2012-06-28 2012-06-28 Capacitive sensor for a collision protection device
PCT/EP2013/001903 WO2014000891A2 (en) 2012-06-28 2013-06-28 Capacitive sensor for a collision protection device

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014013213A1 (en) 2014-09-04 2016-03-10 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt Collision protection device for a vehicle door and method for operating such a collision protection device
WO2019110696A1 (en) * 2017-12-06 2019-06-13 Webasto SE Distributed sensor system for sensing body parts and persons within the hazard zones of a convertible top

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US6452514B1 (en) * 1999-01-26 2002-09-17 Harald Philipp Capacitive sensor and array
US20070159184A1 (en) * 2005-12-22 2007-07-12 Synaptics Incorporated Half-bridge for capacitive sensing
US20080122458A1 (en) * 2006-11-28 2008-05-29 Process Equipment Co. Of Tipp City Proximity detection system
DE202007008440U1 (en) 2007-06-16 2008-11-06 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt anti-trap
US20100066391A1 (en) * 2008-08-08 2010-03-18 Sony Corporation Capacitance change measuring circuit of capacitive sensor device, capacitive sensor module, method of measuring capacitance change of capacitive sensor device, and electronic device
US20110308866A1 (en) * 2010-06-22 2011-12-22 Infineon Technologies Ag Sensor Measurement System Using Pulsed Current Signals

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DE102004051470A1 (en) * 2004-05-25 2005-12-22 Rextron Gmbh Safety interlock system for servo powered doors and windows using proximity sensors and capacitative systems to detect obstructions in the closing path
DE102005038678A1 (en) * 2005-08-16 2007-02-22 Ident Technology Ag Detection system, as well as this underlying detection method

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Publication number Priority date Publication date Assignee Title
US6452514B1 (en) * 1999-01-26 2002-09-17 Harald Philipp Capacitive sensor and array
US20070159184A1 (en) * 2005-12-22 2007-07-12 Synaptics Incorporated Half-bridge for capacitive sensing
US20080122458A1 (en) * 2006-11-28 2008-05-29 Process Equipment Co. Of Tipp City Proximity detection system
DE202007008440U1 (en) 2007-06-16 2008-11-06 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt anti-trap
US20100066391A1 (en) * 2008-08-08 2010-03-18 Sony Corporation Capacitance change measuring circuit of capacitive sensor device, capacitive sensor module, method of measuring capacitance change of capacitive sensor device, and electronic device
US20110308866A1 (en) * 2010-06-22 2011-12-22 Infineon Technologies Ag Sensor Measurement System Using Pulsed Current Signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014013213A1 (en) 2014-09-04 2016-03-10 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt Collision protection device for a vehicle door and method for operating such a collision protection device
WO2019110696A1 (en) * 2017-12-06 2019-06-13 Webasto SE Distributed sensor system for sensing body parts and persons within the hazard zones of a convertible top

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WO2014000891A3 (en) 2014-08-14

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