EP3977619A1 - Assembly for checking the connection of a capacitive sensor assembly of a vehicle - Google Patents
Assembly for checking the connection of a capacitive sensor assembly of a vehicleInfo
- Publication number
- EP3977619A1 EP3977619A1 EP20729055.2A EP20729055A EP3977619A1 EP 3977619 A1 EP3977619 A1 EP 3977619A1 EP 20729055 A EP20729055 A EP 20729055A EP 3977619 A1 EP3977619 A1 EP 3977619A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- arrangement
- detection signal
- connection
- transmission
- sensor electrode
- 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
Links
- 238000001514 detection method Methods 0.000 claims abstract description 115
- 230000005540 biological transmission Effects 0.000 claims abstract description 94
- 238000011156 evaluation Methods 0.000 claims abstract description 41
- 230000004913 activation Effects 0.000 claims abstract description 22
- 230000009471 action Effects 0.000 claims abstract description 19
- 238000012546 transfer Methods 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 17
- 230000001419 dependent effect Effects 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 230000002596 correlated effect Effects 0.000 claims description 4
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 230000003321 amplification Effects 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 10
- 238000003199 nucleic acid amplification method Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 8
- 238000013459 approach Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
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Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/023—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring distance between sensor and object
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing 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
- H03K2217/96—Touch switches
- H03K2217/9607—Capacitive touch switches
- H03K2217/960705—Safety of capacitive touch and proximity switches, e.g. increasing reliability, fail-safe
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing 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
- H03K2217/96—Touch switches
- H03K2217/9607—Capacitive touch switches
- H03K2217/960755—Constructional details of capacitive touch and proximity switches
- H03K2217/96078—Sensor being a wire or a strip, e.g. used in automobile door handles or bumpers
Definitions
- the present invention relates to an arrangement for checking the connection in a capacitive sensor arrangement of a vehicle.
- the invention also relates to a method for checking the connection in a capacitive sensor arrangement of a vehicle.
- sensor arrangements are used in vehicles in order to detect activation actions in the vicinity of the sensor arrangement.
- sensor arrangements of this type have a sensor electrode which can provide a capacitance with respect to the surroundings or the mass of the vehicle. Changes in the environment then have an impact on this capacity, so that in this context one can also speak of a changeable capacity.
- At least one microcontroller is usually used as the evaluation arrangement for evaluating the variable capacitance.
- At least one electrical conductor can be used to connect the sensor electrode to the microcontroller.
- variable capacity is incorrectly determined in the event of a fault in this connection.
- Known solutions for detecting such a fault are often technically complex and are based, for example, on a continuity test of a circuit with the electrical conductor.
- Another - but technically more complex - possibility of detecting the disturbance can be based on checking the input capacitance in this connection.
- an arrangement, in particular a circuit arrangement, for checking the connection in a capacitive sensor arrangement of a vehicle having:
- an (in particular electronic) evaluation arrangement for evaluating a detection signal which is specific for a variable capacitance in the sensor arrangement in order to detect an activation action in the vicinity of at least one sensor electrode of the sensor arrangement, preferably by comparing the (possibly accumulated) amplitude of the detection signal with a detection threshold value,
- a (in particular electronic) transmission arrangement for electrical connection to the sensor electrode via at least one electrical connection line in order to provide the detection signal for the evaluation arrangement, preferably by controlling the sensor electrode via the connection line.
- the evaluation arrangement and the transmission arrangement can each be designed as an electronic circuit arrangement and, for example, can also be arranged on a common printed circuit board.
- the evaluation arrangement can have at least one integrated circuit, such as. B. have a microcontroller.
- the transmission arrangement can have at least one connection and / or an operational amplifier and / or an electronic component for providing, in particular generating and / or transmitting, the detection signal to the evaluation arrangement. In this case, the provision can optionally also take place with an amplification and / or a filtering of the detection signal.
- the evaluation arrangement is designed to carry out the connection check on the basis of the detection signal with regard to, in particular for specific determination, a fault position on the connecting line.
- the connection check can advantageously be carried out using the same detection signal that is also used for the detection of the activation action. This makes it possible to provide a technically simpler way of detecting faults on the connecting line.
- this type of connection check can make it possible to specifically determine the error position. It can be at the error position z. B. be a certain position on the connection line at which a fault (such as a tear or an interruption or a defect or a faulty contacting of a coupling or some other error) is present.
- the specific determination of the fault position can thus possibly also allow between a fault on the sensor electrode itself, on the connecting line directly and possibly on one To distinguish connecting element and / or connecting element (such as a plug). A specific diagnosis of the fault can thus be carried out.
- the specific determination of the fault position advantageously includes a distinction between faults which are present at different positions and / or elements (such as connection lines, connection elements or connection elements) in the current path between the transmission arrangement and the sensor electrode.
- the distinction can e.g. B. take place in that the variable capacitance is detected in terms of value on the basis of the detection signal and, if necessary, compared with one or more specific threshold values for the positions or elements.
- the current path is z. B. mainly formed by the at least one connecting line, and is preferably designed as an open current path (so that only the charging and discharging of the variable capacitance is possible, but not beyond a current flow at a constant voltage).
- variable capacitance is measured absolutely and / or in terms of value for the connection test using the detection signal, and is therefore not (only) detected relatively (i.e. with regard to relative changes).
- the variable capacitance can be determined in terms of value (and thus measured) on the basis of the detection signal.
- This has z. B. the advantage that a threshold can be defined for the measured capacitance, below which a faulty connection is assumed.
- the transmission arrangement can be designed for this linearity, and thus enable linear amplification and / or transmission of the detection signal to the evaluation arrangement.
- the transmission arrangement is z. B. designed as a voltage follower arrangement, in particular as a (preferably capacitive) voltage follower, and / or as a (preferably capacitive) voltage multiplier.
- the transmission arrangement can optionally also be a linear (in particular carry out a voltage gain during the transmission that is linearly dependent on the capacitance in order to allow the capacitance to be determined based on the detection signal.
- a control signal is provided with which charge transfers are effected in the sensor electrode and which can be amplified by the transmission arrangement in order to generate the detection signal in accordance with an amplification factor.
- This has the advantage that not only can the faulty connection status be determined, but also the exact location of the fault can be determined. The following applies, for example. B., the greater the measured value of the capacitance, the further away from the transmission arrangement is the fault position.
- the transmission arrangement can have at least one transmission element and / or frequency-dependent transmission means.
- the vehicle is designed as a motor vehicle, in particular as a hybrid vehicle or as an electric vehicle, preferably with a high-voltage electrical system and / or an electric motor. It may also be possible for the vehicle to be designed as a fuel cell vehicle and / or passenger vehicle and / or semi-autonomous or autonomous vehicle.
- the vehicle has a security system which, for. B. through communication with an identification transmitter (ID transmitter) enables authentication. Depending on the communication and / or the authentication, at least one function of the vehicle can be activated. If the authentication of the ID transmitter is necessary for this, the function can be a safety-relevant function, such as unlocking the vehicle or enabling an engine start.
- ID transmitter identification transmitter
- the function can be a safety-relevant function, such as unlocking the vehicle or enabling an engine start.
- the security system can also be designed as a passive access system, which initiates the authentication and / or the activation of the function when the proximity of the ID transmitter to the vehicle is detected without active manual actuation of the ID transmitter.
- a wake-up signal is repeatedly sent out by the security system, which can be received by the ID transmitter when it approaches, and then triggers the authentication.
- the function can also relate to activation of vehicle lighting and / or actuation (opening and / or closing and / or moving) of a flap (e.g. front or rear or side flap or door).
- the flap can preferably also be designed as a sliding door.
- the vehicle lighting is automatically activated and / or the flap is actuated upon the detection of an activation action such as approaching and / or a gesture by a user.
- the activation act can e.g. B. a hand reaching into a door handle recess and / or an approach to the door handle of the vehicle and / or a movement below a bumper of the vehicle.
- the sensor arrangement and in particular the sensor electrode can be arranged in and / or on the door handle or in and / or on the bumper.
- the flap is arranged, for example, as a door, in particular as a sliding door, on the side area of the vehicle.
- the evaluation arrangement has an electronic processing device (such as at least one microcontroller) in order to determine the fault position on the basis of the detection signal, in particular by means of a value-based detection, preferably measurement, of the capacitance on the basis of the detection signal, preferably the capacitance is provided by the sensor electrode in correlation with the surroundings and in particular the vehicle mass.
- an electronic processing device such as at least one microcontroller
- a detection threshold value is then used for detection which is specific for the presence of the activation action, but not for other changes in capacity.
- the transmission arrangement can be adapted such that the dependency is set as an essentially linear dependency. This has the advantage that simple and reliable detection of the fault and / or determination of the fault position is possible.
- a line such as the connecting line can advantageously designate at least one electrical conductor (possibly also as a stranded wire), which is preferably designed with the same potential, i.e. at the same time only has a single electrical potential and / or forms only one current path.
- the transmission arrangement has at least one transmission element in order to define, preferably set, a dependency of the detection signal on the (variable) capacitance, in particular so that the detection signal is provided with a substantially linear and preferably proportional dependence on the capacitance, to preferably determine the fault position according to this dependency.
- the transmission element can be designed as an electrical or electronic component, such as. B.
- an operational amplifier and / or a coil and / or a resistor and / or a capacitor This makes it possible to define the electrical (for example capacitive) properties of the transmission element.
- a capacitor and a resistor are provided as transmission elements, these components can be dimensioned such that the detection signal is provided at least approximately with a linear and / or proportional dependence on the capacitance in the desired range of capacitance changes.
- a simulation of the arrangement for calculating the detection signal is carried out, and the values of the components are varied for different capacitance profiles. In this way, the desired design of the transmission elements can be determined experimentally.
- a control arrangement for initiating electrical charge transfers via the electrical connection (in particular via the connecting line) of the transfer arrangement to the sensor electrode in order to use the charge transfers to detect the detection signal in the transfer arrangement to generate, the electrical connection preferably having only a single path to the sensor electrode, which is formed by the at least one connecting line in order to provide the charge transfers via the path for charging and / or discharging the sensor electrode, in particular in order to evaluate the charge transfers on the basis of the To detect capacity in relation to the environment and / or a ground potential.
- the charge transfers can, for. B.
- the detection signal may be dependent on the charge transfers, e.g. B. in the form of a voltage and / or current signal with an amplitude dependent on the transferred charge.
- the detection signal can preferably correspond to the amplified control signal, the amplification being able to be dependent on the transferred charge and thus on the variable capacitance.
- z. B. a resistor and a capacitor can be connected to an operational amplifier as a transmission element.
- the transmission arrangement can e.g. B. form an amplifier or capacitive voltage multiplier.
- the gain factor of the amplification can then be dependent on a ratio of the variable capacitance to the capacitance of the capacitor.
- the detection signal can then be provided as a voltage amplified in accordance with this amplification factor, and thus serve to determine the variable capacitance.
- the resistance can be selected as large as possible compared to the reciprocal of the working frequency (e.g.
- the detection signal can thus be made available in an essentially linear manner, preferably in an amplified manner proportionally to the capacitance.
- the amplification relates in particular to the control signal and / or to the electrical signal at the sensor electrode, which is amplified to provide the detection signal.
- the sensor arrangement has at least one further sensor electrode which is electrically connected to a further transmission arrangement via at least one further electrical connection line, in particular via only one path, in particular an open current path is connected to provide a further detection signal for the evaluation arrangement.
- a structure with a plurality of sensor electrodes is possible, each of which can be connected to the evaluation arrangement via its own paths and, if necessary, its own transmission arrangements.
- the transmission arrangements can be designed in the same way in order to provide the defined dependency, in particular amplification, of the detection signal on the variable capacitance.
- the transmission arrangement has a transmission characteristic which is correlated with the connection test in order to distinguish between different error positions on a single path, in particular an open current path, of the at least one connecting line during the connection test.
- the transmission characteristic can e.g. B. comprise a variable gain factor which is dependent (e.g. linearly) on the variable capacitance.
- the transfer characteristic can define the dependency with which the detection signal is provided on the charge transfers or the variable capacitance correlated therewith.
- the transmission characteristic defines the relationship between the detection signal and the change in capacitance.
- the detection signal can optionally correspond to the control signal with regard to the signal shape.
- the at least one connecting line comprises at least two connecting lines which form a single path for charge transfer between the transfer arrangement and the sensor electrode for charging and / or discharging the sensor electrode, and for this purpose electrically via a connecting element are coupled.
- the connecting element is this z. B. designed as an electrical connector such as a connector or the like.
- the evaluation arrangement has at least one electronic processing device in order to use the detection signal, and thus preferably based on the variable capacity to determine at least one of the following information:
- the fault position on the connection line which is specific to the position of a fault and / or interruption on the connection line
- connection element which electrically connects the connection line to the transmission arrangement, in particular an interruption of the connection by the connection element.
- connection element and the connection element can be designed as electrical connectors, such as plug connectors.
- the connection element can be used for direct connection to the transmission arrangement, so that an interruption (such as a tear) of the connection element can cause the lowest capacitance value of the variable capacitance (and thus the greatest drop in capacitance). If this lowest capacity (possibly also the value "0") is determined on the basis of the detection signal during the connection test, it can be concluded that the connection line has been completely torn off. In contrast, in the case of higher capacitance values (but still below a predefined threshold value), it is possible to infer a fault position in the direction of the sensor electrode (that is to say, for example, of the connection element or on the sensor electrode itself).
- the information can also be determined, if necessary, which of various connection and / or connection elements on the connection line, in particular serially in the same path, is interrupted.
- an electronic amplifier element in particular in the form of an operational amplifier, preferably for the (possibly non-amplified) transmission of a control signal from a control arrangement via a path of the at least one connecting line to the sensor electrode in order to carry out repeated charge transfers to the sensor electrode and / or to amplify Transmission of the control signal to the evaluation arrangement with a gain factor dependent on the variable capacitance in order to provide the detection signal as a function of the variable capacitance,
- the transmission means for this purpose being in particular electrically connected to the amplifier element (in particular to define the gain factor), and preferably the detection signal for a transferred amount of charge and / or the variable capacity is specifically provided, wherein the amount of charge transferred can be specific for a change in the capacity.
- the transmission arrangement forms an amplifier and / or a voltage follower in order to provide the detection signal as a function of a change in the (variable) capacitance, in order in particular to transmit information about the change in capacitance through the detection signal to the evaluation arrangement.
- the transmission arrangement preferably has at least one frequency-dependent transmission means in order to define a transmission characteristic for the provision of the detection signal, in particular the information transmission. It can be this transfer characteristic z. B. relate to a variable gain factor with which the drive signal is amplified to generate the detection signal. This gain factor can e.g. B. be dependent on the variable capacity.
- the transmission characteristic can also define a dependency of a change in the gain factor on the change in capacitance of the variable capacitance, which can preferably be essentially linear (in a desired capacitance range and / or used for the detection).
- the invention also relates to a method for checking the connection in a capacitive sensor arrangement of a vehicle. It is provided here that a transmission arrangement for electrical connection with a sensor electrode is via at least one electrical connection line is provided in order to provide a detection signal, in particular for an evaluation arrangement of the sensor arrangement.
- Evaluation of the detection signal which is specific for a variable capacitance in the sensor arrangement, which is provided in particular by the sensor electrode, preferably in order to detect an activation action in the vicinity of the sensor electrode,
- connection check On the basis of the detection signal with regard to, in particular for specific determination, a fault position on the connection line
- the method according to the invention thus has the same advantages as have been described in detail with reference to an arrangement according to the invention.
- the method can be suitable for being carried out by an arrangement according to the invention.
- the evaluation of the detection signal can preferably be carried out by an evaluation arrangement and / or the evaluation arrangement and / or the transmission arrangement can be designed according to an arrangement according to the invention.
- a connection state of the sensor electrode is determined based on a result of the connection test, in particular that it is determined whether the sensor electrode is electrically connected to the transmission arrangement via the at least one electrical connection line. E.g. In this way, a tear and / or a decoupling or open connection of the connection element and / or connection element can be determined.
- determining the connection state it can also be determined whether and / or which of at least one connection and / or connection element is interrupted or inserted. If there are several connection and / or connection elements, these can optionally be integrated serially into the same current path of the connection line.
- the distinction between which of the connecting and / or connecting elements is interrupted can e.g. B. be carried out based on the specific error position. This means that plugged-in detection is possible even when several different plugs are used.
- the threshold value can preferably be set in such a way that, in the case of fault-free connections, the values of the detection signal (possibly for the desired changes in capacity) are always above the threshold value. In this way, the fault can always be detected when the threshold value is not reached.
- the determination of the (specific) fault position is carried out as a function of a resolution in the value-based acquisition, preferably measurement, of the capacitance based on the acquisition signal.
- the resolution of the capacity detection is, for example, in the range of femto farads, e.g. B. at a maximum (i.e. less than) 10 fF or less than 100 fF.
- a resolution of the determination of the fault position in the range from 1 mm to 100 cm, preferably 10 mm to 20 cm, preferably 5 cm to 10 cm can result.
- the sensor arrangement is used to detect the activation action in a front and / or side and / or rear area of the vehicle, preferably to open a door (such as a sliding door) and / or flap of the Vehicle to open and / or unlock and / or to move automatically.
- the activation action in the form of an approach or gesture to a door handle and / or a bumper or the like can be used to indicate the user's wish that a corresponding opening or unlocking or movement should take place.
- Figure 1 is a schematic rear view of a vehicle
- Figure 2 is a schematic side view of a vehicle
- Figure 3 is a schematic representation of parts of an inventive
- Figure 4 is a schematic circuit diagram of parts of an inventive
- FIG. 7 shows a schematic representation of method steps of a method according to the invention.
- FIG. 1 A rear view of a vehicle 1 with an arrangement 150 according to the invention is shown in FIG. 1.
- a sensor electrode 20 can be arranged in a bumper 3 of the vehicle 1, optionally with a further sensor electrode 30.
- an activation action such as an approach, movement and / or gesture of a user 4 in the vicinity 9 of the sensor electrode 20 can be detected.
- the detection can be made possible, for example, if an identification transmitter 5 (electronic key) is recognized in the surroundings 9. This ensures that only one Authorized user 4 can activate the function which is carried out when the activation action is detected.
- an identification transmitter 5 electronic key
- FIG. 2 shows a further variant in which the arrangement 150 according to the invention is arranged in a door handle 2 of the vehicle 1.
- the environment 9 in which the activation action is detected thus corresponds to the environment of the door handle 2, for example in a door handle recess.
- the sensor electrode 20 is for this detection z. B. aligned with the corresponding environment 9.
- a supply line 7 can connect a control device 6 of the vehicle 1 to the arrangement 150 according to the invention.
- an energy supply for the arrangement 150 is provided via the supply line 7, and powerline communication optionally also takes place via the supply line 7.
- the communication between the control unit 6 and the arrangement 150 enables z. B. that a successful detection is communicated to the control device 6 by the arrangement 150 so that the control device 6 can activate the corresponding function.
- FIGS. 3 and 4 show an arrangement 150 according to the invention for checking the connection in a capacitive sensor arrangement 10 of a vehicle 1 with further details.
- An evaluation arrangement 162 for evaluating a detection signal E can be provided.
- the detection signal E can be specific for a variable capacitance CS in the sensor arrangement 10 in order to detect an activation action in an environment 9 of at least one sensor electrode 20 of the sensor arrangement 10.
- a transmission arrangement 170 can be provided for the electrical connection to the sensor electrode 20 via at least one electrical connection line 51, 53 in order to provide the detection signal E for the evaluation arrangement 162.
- the evaluation arrangement 162 is designed to carry out the connection check on the basis of the detection signal E with regard to, in particular for specific determination, a fault position P1, P2, P3 on the connecting line 51, 53.
- the components of the arrangement 150 according to the invention can optionally be on a common printed circuit board 11 be arranged as shown schematically in FIG.
- the transmission arrangement 170 can be connected to at least one sensor electrode 20, 30 via at least one first connection 170.A, 170.A ′.
- connection lines 51, 52, 53 (for example a first, second and third) are provided, which each form a path P for the connection (s).
- a first connection 170.A of the transmission arrangement 170 can be electrically connected to the third connection line 53 via a first plug 41 (as a connection element 41).
- the third connecting line 53 can be electrically connected to the first connecting line 51 via a third plug 43 (as a connecting element 43).
- a second connecting line 52 can be used to provide a further path via a second plug 42 and a further first connection 170.A ', possibly connected to a further transmission arrangement 170' for the further sensor electrode 30.
- the respective path P can be designed as an open current path, so that no closed circuit is formed by the connecting lines 51, 52, 53. A continuity test of these connecting lines 51, 52, 53 is therefore excluded.
- the amount of charge transferred in each case during the charge transfers via the at least one path P provides a conclusion about the variable capacitance CS, which is formed by the sensor electrode 20, 30 with respect to the surroundings 9 and / or a ground potential G.
- the evaluation arrangement 162 can optionally have the electronic processing device 180 in order to determine the error positions P1, P2, P3 shown in FIG. 3 on the basis of the detection signal E, in particular through a value-based detection, preferably measurement, of the capacitance CS on the basis of the detection signal E.
- the transmission arrangement 170 can provide, according to a first function, a control signal A for the path P and thus for the sensor electrode 20 via a first connection 170.A.
- the control signal A serves to Initiate charge transfers via path A, and thus charge and discharge sensor electrode 20.
- the control signal can be generated, for example, as a sinusoidal signal by a control arrangement 161, and applied to the transmission arrangement 170 on the input side via a third connection 170.C.
- the transmission arrangement 170 may e.g. B. form the first function as a voltage follower functionality in order to generate the output-side control signal A corresponding to the input-side applied control signal.
- the transmission arrangement 170 can provide the detection signal E to the evaluation arrangement 162 via a second connection 170.B. Furthermore, the transmission arrangement 170 can have at least one transmission element 171 in order to define a dependency of the detection signal E on the capacitance CS, in particular so that the detection signal E is provided with an essentially linear and preferably proportional dependence on the capacitance CS, around the fault position P1, P2, P3 to be determined according to this dependency.
- This dependency is, for example, a gain with which the detection signal E from the control signal A is provided.
- transmission means 171.2 such as the resistor R shown and (as frequency-dependent transmission means 171.2) the capacitor C with an operational amplifier 171.1 (each as a Transmission element 171) are interconnected.
- the transmission arrangement 170 can be designed as an amplifier (in particular a capacitive voltage multiplier).
- the gain factor of the gain can then be dependent on a ratio of the variable capacitance CS to the capacitance of the capacitor C.
- the detection signal E can then be e.g. B. be provided as a voltage amplified in accordance with this gain factor, and thus serve to determine the variable capacitance CS.
- the resistance R can be selected as large as possible compared to the reciprocal of the working frequency (e.g. frequency of the control signal A) and the maximum intended variable capacitance CS, and / or the capacitance of the capacitor C can be chosen to be identical to the variable capacitance CS.
- the detection signal E can thus be made available in an essentially linear manner, preferably in an amplified manner proportionally to the capacitance CS.
- the electrical connection to the sensor electrode 20 has only a single path P, which is formed by the at least one connecting line 51, 53 in order to provide the charge transfers via the path P for charging and / or discharging the sensor electrode 20.
- the transmission arrangement 170 can have a transmission characteristic which is correlated with the connection test in order to distinguish different error positions P1, P2, P3 on the single path P of the at least one connection line 51, 53 during the connection test.
- a first method step 101 the detection signal E, which is specific for a variable capacitance CS in the sensor arrangement 10, is evaluated in order to detect an activation action in an environment 9 of the sensor electrode 20.
- the connection check is initiated, in which the connection is checked on the basis of the detection signal E with regard to, in particular for specific determination, a fault position P1, P2, P3 on the connecting line 51, 53.
- a connection state of the sensor electrode 20 is determined based on a result of the connection check, in particular whether the sensor electrode 20 is electrically connected to the transmission arrangement 170 via the at least one electrical connection line 51, 53.
- performing the connection check can include the step of comparing at least one value of the detection signal E with at least one threshold value S in order to determine the presence of an error and / or the specific error position P1, P2, P3 on the connecting line 51, 53 determine.
- FIG. 5 shows an exemplary profile of capacitance values CW, which can be measured on the basis of the detection signal E.
- the capacitance values CW are below the threshold S, so that a fault can be determined.
- the statement can be made in this area that the sensor electrode 20 is not inserted.
- the second Area D2 there is an error-free connection.
- a detection threshold can be used to detect the activation action when this detection threshold is exceeded.
- the specific error position can also be determined on the basis of further different threshold values P1, P2, P3.
- This specific determination of the fault position advantageously includes a distinction between faults which are present at different positions and / or elements (such as connection lines 51, 52, 53, connection elements 41 or connection elements 43) in the current path P between the transmission arrangement 170 and the sensor electrode 20.
- the specific error position P1, P2, P3 can correlate with the value CW of the capacitance CS.
- connection element 41 first plug, connection element
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019114254.7A DE102019114254A1 (en) | 2019-05-28 | 2019-05-28 | Arrangement for checking the connection in a capacitive sensor arrangement of a vehicle |
PCT/EP2020/064742 WO2020239858A1 (en) | 2019-05-28 | 2020-05-27 | Assembly for checking the connection of a capacitive sensor assembly of a vehicle |
Publications (1)
Publication Number | Publication Date |
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EP3977619A1 true EP3977619A1 (en) | 2022-04-06 |
Family
ID=70918450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20729055.2A Pending EP3977619A1 (en) | 2019-05-28 | 2020-05-27 | Assembly for checking the connection of a capacitive sensor assembly of a vehicle |
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EP (1) | EP3977619A1 (en) |
DE (1) | DE102019114254A1 (en) |
WO (1) | WO2020239858A1 (en) |
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DE102021129932A1 (en) * | 2021-11-17 | 2023-05-17 | Valeo Schalter Und Sensoren Gmbh | Error detection in the operation of a device for detecting a touch of a capacitive element |
EP4250568A1 (en) * | 2022-03-22 | 2023-09-27 | Huf Hülsbeck & Fürst GmbH & Co. KG | Sensor unit for motor vehicles |
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DE102013015644A1 (en) * | 2013-09-23 | 2015-03-26 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt | Capacitive sensor for a vehicle |
DE102013112418A1 (en) * | 2013-11-12 | 2015-05-13 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Hallstadt | Capacitive sensor arrangement of a motor vehicle |
DE102015003320A1 (en) * | 2015-03-17 | 2016-09-22 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg | Capacitive proximity sensor for a vehicle |
DE102015119701A1 (en) * | 2015-11-15 | 2017-05-18 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Bamberg | Method for operating a capacitive sensor arrangement of a motor vehicle |
DE102017120375A1 (en) * | 2017-09-05 | 2019-03-07 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Sensor device for the capacitive detection of a user action in a vehicle |
-
2019
- 2019-05-28 DE DE102019114254.7A patent/DE102019114254A1/en active Pending
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2020
- 2020-05-27 WO PCT/EP2020/064742 patent/WO2020239858A1/en unknown
- 2020-05-27 EP EP20729055.2A patent/EP3977619A1/en active Pending
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DE102019114254A1 (en) | 2020-12-03 |
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