WO2021160541A1 - Dispositif et procédé d'étalonnage d'un système de capteurs tactiles capacitifs - Google Patents

Dispositif et procédé d'étalonnage d'un système de capteurs tactiles capacitifs Download PDF

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Publication number
WO2021160541A1
WO2021160541A1 PCT/EP2021/052899 EP2021052899W WO2021160541A1 WO 2021160541 A1 WO2021160541 A1 WO 2021160541A1 EP 2021052899 W EP2021052899 W EP 2021052899W WO 2021160541 A1 WO2021160541 A1 WO 2021160541A1
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WIPO (PCT)
Prior art keywords
value
touch
touch sensor
sensor system
sensors
Prior art date
Application number
PCT/EP2021/052899
Other languages
German (de)
English (en)
Inventor
Miklós MOLNÁR
Raphael MACK
Benjamin Dietz
Original Assignee
Valeo Schalter Und Sensoren Gmbh
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.)
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Application filed by Valeo Schalter Und Sensoren Gmbh filed Critical Valeo Schalter Und Sensoren Gmbh
Priority to CN202180021175.9A priority Critical patent/CN115298644A/zh
Publication of WO2021160541A1 publication Critical patent/WO2021160541A1/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • 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
    • H03K17/96—Touch switches
    • H03K17/962—Capacitive touch switches
    • H03K17/9622—Capacitive touch switches using a plurality of detectors, e.g. keyboard
    • 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
    • H03K2217/9401—Calibration techniques
    • H03K2217/94026—Automatic threshold calibration; e.g. threshold automatically adapts to ambient conditions or follows variation of input

Definitions

  • the present invention relates to a method and a calibration device for calibrating a touch sensor system having a plurality of capacitive touch sensors, in particular when it is activated, as well as the corresponding touch sensor system itself, having the touch sensors and the calibration device.
  • the invention also relates to a computer program configured to carry out the method.
  • Capacitive touch sensors are sensors that work on the basis of the change in the electrical capacitance of an individual capacitor or a capacitor system in order to detect an approach of an object, in particular a human finger, to the sensor or, in particular, a touch of the sensor by the object.
  • the ability of such touch sensors to correctly detect an approach or touch often depends heavily on external influences and conditions, in particular on temperature, humidity and aging processes.
  • touch is to be understood as an approach of the object, in particular a human finger, to a touch sensor in addition to an actual touch, in which there is no actual contact, but a the object is so close to the touch sensor that this approach can be detected as a touch according to a specification or configuration of the touch sensor system.
  • a specification or configuration of the touch sensor system typically, according to such configuration specifications, approximations to a distance of only a few millimeters, e.g. 5 mm or less, are also included. Nonetheless, touch sensor systems are also possible in which only an actual touch is evaluated as a touch.
  • a touch sensor system based on such capacitive touch sensors is activated, especially if it is started up (i.e. when starting up) or if one or more touch-dependent functionalities are started afterwards, the external influences acting on it on the touch sensors are usually not the touch sensor system itself known in detail, so that the case may arise that no reliable detection possible contact. Accordingly, the reliability in touch recognition is often insufficient.
  • the present invention is based on the object of further improving the reliability of a capacitive touch sensor system.
  • a first aspect of the invention relates to a, in particular computer-implemented, method for calibrating a touch sensor system having a plurality of capacitive touch sensors, in particular when it is activated.
  • the method comprises: (i) measuring a respective individual electrical capacitance value of the touch sensors, wherein the measurement for the various touch sensors can take place in particular simultaneously or within a defined measurement period (eg 5 seconds or less, preferably 1 second or less); (ii) for each of the touch sensors, determination of a respective comparison value that indicates the size of any deviation (in particular as a difference or ratio or based on it) between the respective measured capacitance value and an initial, in particular individual or global, determined for this touch sensor in advance all touch sensors are the same, represent the baseline capacitance value and positively correlate with the size of the deviation; (iii) Determining a compensation value based on the comparison values, whereby the compensation value is determined in such a way that it lies between the largest and the smallest of the comparison values or is equal to that of the comparison values which
  • a “touch sensor system” in the sense of the invention is to be understood as a sensor system having a plurality of capacitive touch sensors, which is designed to use the touch sensors to perform a touch detection based on the change in the electrical capacitance of a capacitor or capacitor system in the respective touch sensor.
  • the touch sensor system can in particular be configured in such a way that each touch sensor is capable of detecting its contact with an object. Using the majority of the touch sensors present in the touch sensor system, it is possible in this case to detect differently localized contacts corresponding to the different positions of the individual touch sensors.
  • a “capacitance value” is to be understood as a, in particular numerical, value which represents an absolute or relative variable of an electrical capacitance provided as a measuring capacitance in an associated touch sensor to which the capacitance value is assigned.
  • a “baseline capacitance value” is also to be understood as a, in particular numerical, value which represents an absolute or relative variable of an electrical capacitance provided as a measuring capacitance in an associated touch sensor to which the capacitance value is assigned.
  • the baseline capacitance value is already determined in advance. This can take place in particular on the basis of a capacitance measurement of the measuring capacitance under certain standard conditions or by other pre-definition, for example on the basis of the specific Touch sensor sensor designs.
  • a baseline capacitance value can therefore be understood in particular as a reference capacitance value for the touch sensor, which represents a setpoint value for the electrical capacitance of the measuring capacitance of the touch sensor that is free from the external influences that usually occur in real use of the touch sensor system and are usually variable.
  • a “capacity excess of the initial baseline capacitance value compared to the associated measured capacitance value” for a specific touch sensor thus relates to the case that the electrical capacitance represented by the initial baseline capacitance value for the touch sensor is greater than the electrical capacitance measured by this touch sensor as part of the method Capacity value is represented.
  • "excess capacitance of the associated measured capacitance value compared to the initial baseline capacitance value” for a specific touch sensor relates to the case that the electrical capacitance represented by the initial baseline capacitance value for the touch sensor is smaller than the electrical capacitance that corresponds to the capacitance value measured by this touch sensor as part of the process is represented. If both values are the same, the excess capacity is zero.
  • the compensation value is determined on the basis of the comparison values in such a way that the compensation value is determined such that it is smaller than the largest of the comparison values and at the same time greater than or equal to the smallest of the comparison values.
  • the compensation value is then determined on the basis of the comparison values in such a way that the compensation value is determined in such a way that it is greater than the smallest of the comparison values and at the same time less than or equal to the largest of the comparison values.
  • the determined compensation value when using the touch sensor system for touch detection can in particular already relate to the capacitance measured values measured in accordance with the method thus at the same time represent a first measurement for contact detection. Additionally or alternatively, it can refer to a further subsequent use of the touch sensor system for touch detection, in particular also to such use over a longer period of time, which can in particular last until the next subsequent (re) activation of the touch sensor system.
  • the touch sensor system be calibrated in a simple manner, but also at the time of calibration, in particular when the touch sensor system is activated, reliable detection of a touch or non-touch for each of the touch sensors, and thus, for example, a correct one Achieve finger position on a control panel having a plurality of the touch sensors, using the correction based on the compensation value determined according to the method.
  • the method is based in particular on the approach that external influences that affect all touch sensors of the touch sensor system are differentiated from individual influences that can occur on the touch sensors through individual touches or object approaches
  • the system is calibrated on the basis of a compensation value which is the same for all touch sensors and which was determined on the basis of the external influences that are essentially the same for all touch sensors.
  • the compensation value is determined in such a way that that of the comparison values is defined as the compensation value which has the largest excess capacity of the initial baseline capacity value compared to the associated measured capacity value or otherwise the smallest excess capacity of the associated measured capacity value (C) compared to the initial baseline capacity value (BO). represents.
  • the compensation value is determined on the basis of the comparison values in such a way that the compensation value is determined in such a way that it is equal to (signed) is the smallest of the comparison values.
  • the compensation value is determined in such a way that that of the comparison values is set as the compensation value which most likely corresponds to a non-touched state of the corresponding touch sensor, since in this case the excess capacitance of the initial baseline capacitance value compared to the associated measured capacitance value of the touch sensor is greatest. That way you can turn one into one Achieve particularly reliable contact detection leading calibration, in particular baseline adjustment, of the touch sensor system.
  • the compensation value is determined in such a way that an average value or a median value of the distribution of the comparison values is established as the compensation value.
  • determining the compensation value can include: (i) setting an average value or a median value of the distribution of the comparison values as a preliminary value for the compensation value; (ii) determining those touch sensors whose measured capacitance values indicate the absence of a touch in accordance with a correction of the measurements on the basis of the preliminary value for the compensation value as untouched touch sensors; (iii) setting the average value or the median value of the distribution of the comparison values for the determined untouched touch sensors as the final value for the compensation value.
  • the determined compensation value is taken into account when using the touch sensor system for touch detection by correcting the capacitance values measured in the process or the baseline capacitance values of the touch sensors on the basis of the final compensation value.
  • only those comparison values from the distribution of the comparison values can be used to determine the average value or median value which, according to a predetermined filter criterion, do not represent extreme values within the distribution of the comparison values.
  • Extreme values within the distribution of the comparison values in particular extreme values that are based on an extreme measured capacitance value, are more likely to be caused by an incorrect measurement or by external influences specific to the sensor, comparison results used in the determination of the compensation value can be more reliable by means of such a filtering of the determination of the compensation value thus increased reliability of the touch sensor system calibrated on the basis of the compensation value can be achieved.
  • the touch sensor system can further comprise a capacitive reference sensor which is arranged in the touch sensor system so that it cannot be touched at all or at least not easily touched by a user of the touch sensor system with the same hand as one of the touch sensors.
  • the method here also has: (i) measuring an electrical capacitance value of the reference sensor; (ii) Determining a comparison value for the reference sensor which represents the size of a possible deviation between the measured capacitance value of the reference sensor and an initial baseline capacitance value determined in advance for the reference sensor and which correlates positively with the size of the deviation. To determine the average value or median value, in addition to the comparison values from the distribution of the comparison values for the touch sensors, the comparison value for the reference sensor is also used.
  • the capacitive reference sensor is arranged in the touch sensor system in such a way that it cannot be touched at all by a user of the touch sensor system if contact is structurally prevented. This can be the case, for example, if (i) the reference sensor is arranged in such a way that none of the electrodes used for capacitance measurement is on a surface of the touch sensor system or directly below it (i.e. in such a way that contact with the surface above it could still be reliably detected) , or if (ii) even if at least one of the electrodes is on or directly below the surface, this electrode or the surface section immediately above it cannot be reached with a finger.
  • the capacitive reference sensor cannot easily be touched with the same hand as one of the touch sensors if the reference sensor is basically arranged to be touchable and can therefore also detect touches, but its arrangement relative to the touch sensors of the touch sensor system is designed in such a way that due to the Distance or the geometry of the touch sensor system a simultaneous unintentional touching of the reference sensor and one of the touch sensors with the same hand of a user of the touch sensor system is at least almost impossible.
  • the touch sensors are combined in a control panel and the reference sensor is arranged at a distance from the control panel and configured to detect touches.
  • the distance can be selected to be so large that the reference sensor cannot be operated, or at least not easily operated at the same time as the control panel with the same hand of a user.
  • a capacitive sensor already present for another reason, namely contact detection, as a reference sensor in the sense of multiple use (“multi-use” or “dual use”), which increases the efficiency of the touch sensor system .
  • the reference sensor can be a capacitive sensor of a second control panel which has a plurality of capacitive sensors and the method furthermore comprises: (i) measuring a respective individual electrical capacitance value of the sensors of the second control panel; (ii) for each of the sensors of the second control panel, determining a respective comparison value which represents the size of a possible deviation between the measured capacitance value of the respective sensor and an initial baseline capacitance value determined for it in advance and which correlates positively with the size of the deviation; and (iii) selecting that one of the sensors of the second control panel as the reference sensor which has that comparison value among the comparison values for these sensors which represents the greatest excess capacitance of its initial baseline capacitance value compared to the associated measured capacitance value.
  • Touch detection means that each of the touch sensors is calibrated at least by means of one of the following corrective measures or a combination thereof: (i) determining a compensated baseline capacitance value assigned to the respective touch sensor by means of at least partial compensation of the initial baseline capacitance value assigned to this touch sensor based on the compensation value; (ii) Determination of a corrected touch detection threshold individually assigned to the respective touch sensor by means of at least partial compensation of an associated initial touch detection threshold established in advance, in particular individually or for all of the touch sensors, based on the compensation value.
  • the touch detection threshold defines a capacitance threshold for the detection of a touch of the touch sensor by an object.
  • the compensation can take place in particular by adding the compensation value to the respective initial baseline value. While variant (i) represents a baseline adjustment in the narrower sense, which allows the same touch detection threshold to be used for all touch sensors, variant (ii) allows the baseline values to be left unchanged, since sensor-specific touch detection thresholds are used instead.
  • the method further comprises: (i) determining those touch sensors whose capacitance values indicate the presence of a touch according to the calibration as touched touch sensors; and (ii) providing an output signal identifying the touched touch sensors.
  • an actual contact measurement also takes place here. In this way, both can take place, in particular, based on the same capacitance measurement results, so that a multiple measurement is not required for the calibration on the one hand and for an actual contact measurement on the other hand.
  • the method further comprises: high-pass filtering of the sensor signals generated by the individual touch sensors when measuring their respective individual electrical capacitance value, in order to filter out low-frequency signal components from the signal. Since low-frequency signals typically do not result from an object touching a touch sensor, signal components that are likely to be due to external influences and could potentially impair the measurement result, in particular also falsify, can be filtered out in advance so that they can be used as part of the calibration of the Touch sensor system no longer come into play. In this way, the achievable reliability of the system can be further increased.
  • a second aspect of the invention relates to a calibration device for calibrating a touch sensor system having a plurality of capacitive touch sensors.
  • the device is configured to carry out the method according to the first aspect.
  • a third aspect of the invention relates to a touch sensor system, having a plurality of capacitive touch sensors and a calibration device according to the second aspect, wherein the touch sensor system is configured, in particular when activated, to use the calibration device to calibrate the touch sensor system according to the method according to the first aspect.
  • the touch sensor system can in particular be configured as an input system for a user interface of a vehicle.
  • the touch sensor system can in particular be configured as an input system for a user interface arranged on a steering device of a vehicle.
  • a fourth aspect of the invention relates to a computer program, comprising instructions which, when the computer program is executed by a computer, in particular by a processor of the calibration device according to the second aspect, cause the computer to execute the method according to the first aspect.
  • the computer program can in particular be stored on a non-volatile data carrier.
  • a non-volatile data carrier is preferably a data carrier in the form of an optical data carrier or a flash memory module.
  • the computer program can be saved as a file on a Data processing unit, in particular on a server, and be downloadable via a data connection, for example the Internet or a dedicated data connection, such as a proprietary or local network.
  • the computer program can have a plurality of interacting individual program modules.
  • the calibration device according to the second aspect or the touch sensor system according to the third aspect can therefore in particular have a program memory in which the computer program is stored.
  • the calibration device or the touch sensor system can also be set up to access an externally available computer program, for example on one or more servers or other data processing units, via a communication link, in particular to exchange data with it that are used during the course of the method or computer program or represent outputs of the computer program.
  • FIG. 1 schematically shows an exemplary touch sensor system according to a first embodiment, including a plurality of touch sensors and a calibration device according to an embodiment of the invention, and the exemplary arrangement of this touch sensor system on a steering device of a vehicle as a user interface for touch inputs;
  • FIG. 2 schematically shows an exemplary touch sensor system according to a second embodiment, in which the touch sensor system has two different control panels and is configured as a user interface on a steering device of a vehicle;
  • 3 shows a flow chart to illustrate a first preferred embodiment of the method according to the invention, which is based on a special selection of a comparison value as a compensation value;
  • FIG. 4 shows a diagram in accordance with a first example for illustrating a baseline correction in accordance with the method from FIG. 3;
  • FIG. 5 shows a diagram in accordance with a second example to illustrate a baseline correction in accordance with the method from FIG. 3;
  • FIG. 5 shows a diagram in accordance with a second example to illustrate a baseline correction in accordance with the method from FIG. 3;
  • 6A-C show a flowchart to illustrate a second preferred embodiment of the method according to the invention, which is based on averaging of comparison values for determining the compensation value;
  • FIG. 7 shows a diagram according to an example for illustrating a baseline correction according to the method from FIGS. 6A-C
  • An exemplary touch sensor system 100 has a plurality (in the present example four) capacitive touch sensors 110a to 110d, which can in particular be arranged in a (first) control panel 105 of touch sensor system 100. Furthermore, the touch sensor system 100 has a capacitive reference sensor 115, which is preferably arranged such that it cannot be touched directly by a user of the touch sensor system 100. This has the advantage that the reference sensor 115 can, to a good approximation, be viewed as not being influenced by external influences on its measuring capacitance emanating from a user, in particular his / her region. Furthermore, the touch sensor system 100 has a calibration device 120 which has a processor unit 125 and a program and data memory 130 coupled to it.
  • the processor unit 125 can in particular have one or more microprocessors and can in particular be designed as a microcontroller.
  • the method according to the invention can in particular be designed as a computer-implemented method and a corresponding program configured for its execution on the processor unit 125 can be stored in the memory 130 for this purpose.
  • the touch sensor system 100 according to FIG. 1 can in particular be configured as a user interface in a vehicle, for example for arrangement on a steering device 135, in particular on a steering wheel. An exemplary embodiment for this is shown in FIG.
  • a further control panel 140 is provided here as an extension of the touch sensor system 100 according to FIG .
  • the touch sensors of the first control panel 105 are specifically referred to as “touch sensors”, while for the purpose of better explanation, the capacitive sensors of the second control panel 140, which are technically also touch sensors, are not referred to as such.
  • the capacitive sensors of at least the first control panel 105 can be calibrated by the calibration device 120, in particular according to one of the methods described below with reference to FIGS. 3 to 7. This preferably applies equally to the capacitive sensors of the second control panel.
  • a selected touch sensor of the second control panel is used as a reference sensor 115 for calibrating the touch sensors 100a to 100d of the first control panel 105. Correspondingly, this can also be possible the other way around.
  • a first preferred embodiment 200 of a method according to the invention will now be explained with reference to the touch sensor system 100 from FIG. 1, which is based on a special selection of a comparison value as a compensation value.
  • the method 200 is preferably carried out when the touch sensor system is activated, in particular when it is started up, and accordingly begins with an activation of the touch sensor system 100 in a step 205. Instead, it can also be carried out at other times, in particular each time a measurement is to take place, or at regular intervals. Accordingly, “activating” the touch sensor system should be understood to mean, in particular, any triggering of a working or calibration operating mode of the touch sensor system.
  • the respective individual capacitance values C of the touch sensors 110a to 110d of the touch sensor system 100 are then measured in a step 210.
  • the sensor signals are preferably high-pass filtered.
  • FIGS. 4 (a) and 5 (a) show two different examples for determining these respective comparison values V for touch sensors 110a to 100d from a set of associated initial baseline capacitance values BO and capacitance values C measured in step 210 by means of such a difference formation.
  • a negative compensation value results.
  • step 220 the smallest (signed) comparison value Vmin is then determined from the set of comparison values V determined in step 215 and defined as compensation value C in step 225, which can coincide with step 220.
  • One motivation for this choice is that, depending on their type, external influences can have a positive or negative effect on a measured capacitance value C of a touch sensor and can thus increase or decrease it, while the influence of a touch of the touch sensor, in particular by a human finger, can usually only have a capacity-increasing effect.
  • Vmin the smallest of the comparison values is selected, ie Vmin, then this corresponds to the selection of that one of the capacitance values K measured in step 210 that is least likely or probably least likely to be affected by external influences. Since the compensation value is a measure of the external influences assumed to be approximately the same for all touch sensors in the absence of contact should represent, this selection represents a generally good estimate of the value of a compensation value that can be used for this purpose. In FIGS is chosen as the compensation value.
  • the respective initial baseline capacitance values BO of all touch sensors 110a to 110d of touch sensor system 100 can be corrected on the basis of the determined compensation value Vmin.
  • This can in particular take place in such a way that for this purpose there is a signed addition of the compensation value to the respective initial baseline capacitance value B0 in order to obtain corrected baseline capacitance values Bk.
  • the respective contact state of the touch sensors 110a to 110d can now be determined on the basis of the respective measured capacitance value C and the respective corrected baseline capacitance value Bk.
  • the respective contact state of each of the touch sensors can now be determined, a touch being detected as such if the associated corrected comparison value Vk for the relevant touch sensor reaches or exceeds the touch detection threshold T. Otherwise, non-contact is detected.
  • an output signal can finally be output which represents the respective determined contact states of the touch sensors 110a to 110d.
  • This output signal can in particular be used as a control signal to control one or more functionalities corresponding to the various touch sensors, such as for volume control for an entertainment system or for configuring an automatic vehicle control, in particular an ACC (Automatic Cruise Control).
  • ACC Automatic Cruise Control
  • a second preferred embodiment 300 of a method according to the invention will now be explained with reference to the touch sensor system 100 from FIG. which is based on a mean value formation (or alternatively a median formation) over the comparison values to determine the compensation value.
  • the method 300 is also preferably carried out when the touch sensor system is activated, in particular when it is started, and accordingly begins, as shown in FIG. 6A, with an activation of the touch sensor system 100 in a step 305 Points in time are carried out, in particular at regular time intervals or every time a measurement is to be carried out.
  • a measuring step 310 for measuring the individual capacitance values C of the touch sensors 100a to 100d, which corresponds to step 210 of the method 200.
  • a reference sensor 115 can be provided. This is explained below in particular with regard to a touch sensor system with two different control panels, as shown in particular in FIG. 2.
  • a capacitive sensor of the second control panel can be dynamically selected as the reference sensor, in particular as illustrated in FIG. 6B.
  • a step 311 for the capacitive sensors of the second control panel analogously to step 310, individual capacitance values are measured for the first control panel, with a high-pass filtering of the corresponding optionally also being able to be used again.
  • step 312 in analogy to step 215 of method 200, an individual comparison value is determined for each of the sensors of the second control panel as the difference between the respective associated measured capacitance value and a previously determined initial baseline capacitance value of the respective sensor.
  • step 313 that one of the sensors of the second control panel is selected as the reference sensor for the touch sensor system 100 which has the smallest comparison value among the sensors of the second control panel.
  • the motivation for selecting the sensor with the smallest comparison value as the reference sensor corresponds to the reasoning already explained above for method 200 with regard to the selection of the minimum comparison result Vmin as the compensation value.
  • an individual comparison value V is generated for each of the touch sensors 100a to 100d of the first control panel 105 as the difference between the respective associated measured capacitance value C. and a predetermined initial baseline capacitance value B0 of the respective touch sensors 100a to 100d.
  • extreme values can be filtered out in step 320 in accordance with a predetermined filter criterion in order to prevent the subsequent determination of the compensation value against potentially falsified comparison values, such as those caused by particular individual temperature fluctuations on individual of the Touch sensors could have been triggered (e.g. by selective solar radiation) to protect.
  • a preliminary value for the compensation value is first determined in step 325 by setting this equal to the average value of the determined fed comparison values of the touch sensors and, if applicable, of the reference sensor.
  • a preliminary correction of the respective baseline capacitance values B0 of all touch sensors 100a to 100d of touch sensor system 100 takes place in step 330 signed addition of the provisional value of the compensation value to the respective initial baseline capacitance value BO.
  • step 335 the respective preliminary contact state of the touch sensors 100a to 100d can be determined in each case on the basis of the respective measured capacitance value C and the respective provisionally corrected baseline capacitance value.
  • FIG. 6C A step 340 follows, in which, on the basis of the provisionally determined contact states, those touch sensors are determined which are detected as “unaffected” according to a comparison of the touch detection threshold T with the respective comparison value of the touch sensor. These untouched touch sensors are therefore those touch sensors whose comparison value is lower than the touch detection threshold T.
  • a final value for the compensation value can be determined as the average value M (alternatively median value, see above) (only) the filtered comparison values V determined for the untouched touch sensors and the reference sensor 115.
  • a final correction of the respective initial baseline capacitance values B0 of all touch sensors 100a to 100d of touch sensor system 100 can then take place in step 350.
  • the corresponding final corrected baseline capacitance value Bk of the respective touch sensor can in particular be determined on the basis of a signed addition of the final compensation value M to the initial baseline capacitance value B0 of the relevant touch sensor.
  • control panel in particular first control panel 110a-d touch sensors
  • processor unit 130 program and data memory 135 steering device of a vehicle, in particular a steering wheel

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Abstract

L'invention concerne un procédé et un dispositif d'étalonnage pour étalonner un système de capteurs tactiles comprenant une pluralité de capteurs tactiles capacitifs. Le procédé comprend les étapes consistant à mesurer une valeur de capacité électrique individuelle des capteurs tactiles ; à déterminer, pour chacun des capteurs tactiles, une valeur de comparaison spécifique, qui représente l'amplitude de toute divergence entre la valeur de capacité mesurée concernée et une valeur de capacité de base initiale préalablement déterminée pour ledit capteur tactile et qui est en corrélation positive avec l'amplitude de l'écart ; à déterminer une valeur de compensation sur la base des valeurs de comparaison, la valeur de compensation étant déterminée de telle sorte que la valeur se situe entre la plus grande et la plus petite des valeurs de comparaison ou est égale à l'une des valeurs de comparaison qui représente le plus grand excès de capacité dans la valeur de capacité de base initiale sur la valeur de capacité mesurée associée ; et à tenir compte de la valeur de compensation déterminée lors de l'utilisation du système de capteurs tactiles pour la détection de toucher au moyen d'une correction des valeurs de capacité mesurées ou des valeurs de capacité de base initiales des capteurs tactiles sur la base de la valeur de compensation. L'invention porte en outre le système de capteurs tactiles lui-même ainsi qu'un programme informatique configuré pour réaliser le procédé.
PCT/EP2021/052899 2020-02-12 2021-02-08 Dispositif et procédé d'étalonnage d'un système de capteurs tactiles capacitifs WO2021160541A1 (fr)

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