EP2877376A1 - Verfahren zum erfassen und verarbeiten von messwerten eines kapazitiven annäherungssensors zum auslösen einer betätigungsfunktion einer heckklappe eines kraftfahrzeugs mit einem energiesparenden auswertemodus - Google Patents
Verfahren zum erfassen und verarbeiten von messwerten eines kapazitiven annäherungssensors zum auslösen einer betätigungsfunktion einer heckklappe eines kraftfahrzeugs mit einem energiesparenden auswertemodusInfo
- Publication number
- EP2877376A1 EP2877376A1 EP13736851.0A EP13736851A EP2877376A1 EP 2877376 A1 EP2877376 A1 EP 2877376A1 EP 13736851 A EP13736851 A EP 13736851A EP 2877376 A1 EP2877376 A1 EP 2877376A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measured values
- digital
- value
- predetermined
- evaluation mode
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
- E05F15/00—Power-operated mechanisms for wings
- E05F15/70—Power-operated mechanisms for wings with automatic actuation
- E05F15/73—Power-operated mechanisms for wings with automatic actuation responsive to movement or presence of persons or objects
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2400/00—Electronic control; Electrical power; Power supply; Power or signal transmission; User interfaces
- E05Y2400/10—Electronic control
- E05Y2400/40—Control units therefor
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2400/00—Electronic control; Electrical power; Power supply; Power or signal transmission; User interfaces
- E05Y2400/80—User interfaces
- E05Y2400/85—User input means
- E05Y2400/852—Sensors
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2400/00—Electronic control; Electrical power; Power supply; Power or signal transmission; User interfaces
- E05Y2400/80—User interfaces
- E05Y2400/85—User input means
- E05Y2400/856—Actuation thereof
- E05Y2400/858—Actuation thereof by body parts, e.g. by feet
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
- E05Y2900/53—Type of wing
- E05Y2900/546—Tailboards, tailgates or sideboards opening upwards
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
- E05Y2900/00—Application of doors, windows, wings or fittings thereof
- E05Y2900/50—Application of doors, windows, wings or fittings thereof for vehicles
- E05Y2900/53—Type of wing
- E05Y2900/548—Trunk lids
Definitions
- the invention relates to a method for detecting and
- Approach sensor for triggering an actuation function of a tailgate by a predetermined foot movement of an operator, wherein periodically after each sampling interval, a measured value of the capacitive proximity sensor detected and a measured value corresponding to the digital measured value in a FIFO memory
- Electrodes of capacitive sensors to be arranged such that their capacity relative to a reference potential (for example, mass) changes when an operator who is behind the motor vehicle, a foot in the direction of the rear area and under the rear area briefly pivots.
- a reference potential for example, mass
- capacitive sensor is coupled to an evaluation circuit which outputs an analog output signal corresponding to the capacitance to an A / D converter of a microcontroller.
- Microcontroller is programmed to initiate the A / D converter periodically to the analog sensor output signal
- digital readings output corresponding digital values, which are to be referred to below as digital readings.
- the digital measured values corresponding to the capacitance of the capacitive sensor are generated periodically, for example at intervals of 20 ms.
- the changes in the digital readings are evaluated, the microcontroller being programmed to be based on the
- Changes in digital metrics can detect whether a particular Event, for example, the approach of a foot of the operator, has taken place. If the microcontroller determines that a specific event has taken place, it triggers an actuation function of a tailgate of the motor vehicle. Thus, the tailgate is opened when the operator standing behind the vehicle pivots his foot in a certain way under the rear of the vehicle.
- two sensor electrodes are preferably arranged horizontally and vertically offset in a certain way. For example, it is elongated, formed by an outer conductor of a coaxial cable sensor electrodes, which are arranged offset transversely to the vehicle longitudinal direction and each other vertically and horizontally in the rear area. Such an arrangement is shown schematically in FIG.
- the digital measured values acquired at short time intervals are stored in a memory area of a RAM of the
- Microcontroller stored.
- a predetermined number of digital readings are buffered before the microcontroller of the microcontroller accesses these digital readings for further processing.
- the further processing comprises first a digital filtering of a predetermined number of stored digital measured values, thus digital
- the filter values are calculated at the same time intervals that the digital readings are taken. Whenever a new digital reading is stored, the microprocessor calculates a new filter value from that and previously stored digital readings.
- Filter value determined is merely compared with a threshold value, the exceeding of which thus represents the criterion which can be determined with little computational effort. As long as the threshold value of the filter value is not exceeded, this extraction of the
- the device then switches to a higher sampling rate, that is, the digital readings are taken at shorter intervals and subsequently filtered again.
- the filtering can only begin when a predetermined minimum number of digital measured values having the higher sampling rate has been recovered and stored in the buffer memory.
- the digital measurements previously obtained with the lower sampling rate can not be included in the further processing. This leads to a certain dead time after the detected
- Filter value for further evaluation and to analyze whether the specified foot movement of an operator has taken place, can be calculated.
- the object of the invention is therefore to provide a method for
- the FIFO memory may e.g. a separate component or part of a
- a filter value is calculated in each case after storing a predefined first number of digital measured values, that is to say for each time interval corresponding to the product of sampling period and first number, from the currently stored digital measured value and a predetermined second number of previously stored digital measured values, by each of these stored digital measured values is multiplied by an associated first factor and the results are added. Then the filter value is compared to a threshold. If the filter value is the
- Threshold value a second evaluation mode is activated.
- the second, normal evaluation mode each time after a predetermined third number of
- Digital value and a predetermined fourth number of previously stored digital measurements calculates a filter value by multiplying each of these stored digital measurements by an associated second factor and adding the results, and the filter value is added to an algorithm for
- Sampling frequency sampling rate or sampling period remain constant during the first and the second evaluation mode, so that it is not necessary after starting the second
- Evaluation mode won at greater intervals than in the second, normal evaluation mode.
- the filter calculations therefore need slightly less energy in the energy-saving mode.
- the predefined first number of digital measured values preferably corresponds to at least twice the predetermined third number of digital measured values. The larger the first number, the greater the energy savings, because the
- the predetermined first number of digital readings is between 4 and 16, preferably equal to 8.
- the second number is equal to the fourth number and corresponds to the memory depth of the FIFO memory. For example, this is equal to 32. In this
- Embodiment is always exploited in the first, energy-saving mode of operation as well as in the second, normal operating mode, the full memory depth in order to obtain the best possible filtering.
- Sampling interval in the range between 1 ms and 10 ms, preferably in the range between 2 ms and 6 ms, for example at about 4 ms. This sampling interval allows - with a corresponding number of the included measured values - a good filtering of the
- Waveform smoothing and noise reduction
- the second factors determining the type of filtering in the second evaluation mode are different from the first factors determining the type of filtering in the first evaluation mode, so that the
- the first filtering may be adapted to the lower rate of generating a filter value and to the task of detecting a threshold overshoot.
- the second filtering may be at the higher rate of
- the fourth number (number of in the fourth number) is the fourth number (number of in the fourth number).
- amplified signals are filtered out in a frequency range corresponding to the occurring during the foot movement of the operator frequency range of the capacitance change. This is preferably a frequency range up to 5 Hz.
- a preferred embodiment of the method is characterized in that measured values of two capacitive proximity sensors arranged offset in the vehicle longitudinal direction are detected and digital measured values corresponding to the measured values are stored in two FIFO memory areas assigned to the sensors.
- Evaluation mode calculated only the filter values for one of the two sensors and compared with the threshold and calculated in the second evaluation mode, the filter values for both sensors and supplied to the algorithm for detecting the signal flow corresponding to the predetermined foot movement of an operator.
- Figure 1 is a schematic representation of the
- Figure 2 is a schematic representation of the timing of digital data acquisition and filter calculations.
- the inventive method detects and processes
- FIG. 1 shows the rear region 1 of a motor vehicle, which has the electrodes 2A and 2B of two capacitive proximity sensors in the vicinity of the ground (behind a diaphragm).
- they are elongated sensor cables extending transversely to the
- the voltages corresponding to the capacitances of the two sensor electrodes are in each case supplied to an input port of a microcontroller 5, wherein an analog-to-digital converter 7A and 7B is connected to each of the input ports
- the microcontroller 5 contains a
- Microprocessor 6 a ROM 10 for storing
- a RAM 8 as a working memory and other interface circuits, one of which is exemplified as a port 11.
- the analog-to-digital converters 7A, 7B and the other circuits mentioned are connected to the microprocessor 6 via a bus 9.
- the microprocessor 6 causes the reading of the digital measured values from the analog-to-digital converters 7A, 7B and their storage in the RAM 8.
- certain memory area 12 is provided in which the
- Figure 2 illustrates the timing of acquisition of the digital measurements and the calculation of filter values according to a preferred embodiment of the invention
- the microcontroller causes, for example, every 4 ms for each sensor a digital reading is obtained by the A / D converter to output a
- the FIFO area 12 may receive 32 digital readings per sensor in the preferred embodiment shown here.
- the 32 values respectively stored in the FIFO area are shown in FIG. 2 as 32 small squares and correspond to one line of this representation.
- a column corresponds to a measured value. Physically different embodiments of such a FIFO memory are conceivable.
- a measured value preferably remains stored in its memory area until it is overwritten by a new measured value after 32 measured value acquisitions.
- FIG. 2 illustrates the further procedure in the first energy-saving evaluation mode.
- the microcontroller causes the calculation of a filter value.
- the last 32 ms are included in the filter calculation which takes place every 32 ms.
- Each stored measurement thus participates in a total of four filter calculations.
- the fact that the filter calculation is performed only every 8 ms reduces the power consumption.
- the Including the full 32 digital readings stored in the FIFO area a more accurate filtering
- the filter value obtained in this way is then compared with a threshold value.
- a second evaluation mode is activated.
- Filter value calculation reduced. For example, a filter value is calculated every 2 or 4 measured values. The now in shorter
- Spacing filter values obtained are supplied to an algorithm for detecting a waveform corresponding to the predetermined foot movement of an operator.
- the filter calculation is done, for example, with an FIR algorithm.
- all 32 digital measured values are multiplied by a factor and from these products a sum is formed, which corresponds to the filter value.
- Filter coefficients for expression are, for example, in the second, normal evaluation mode
- the filter coefficients in the first and second modes may be adapted to the respective rate of recovery of the filter values.
- Samples while in the normal evaluation mode, for example, they are obtained every 8 ms (after every two samples).
- sampling period 4 ms and, for example, in the range of 1 to 10 ms.
- distance of 4 ms for example the sampling period of 4 ms and, for example, in the range of 1 to 10 ms.
- Filter calculations in the first and in the second evaluation mode can vary, of course with the proviso that it is lower in the second evaluation mode.
- the depth of the FIFO memory may differ from 32.
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201210106851 DE102012106851A1 (de) | 2012-07-27 | 2012-07-27 | Verfahren zum Erfassen und Verarbeiten von Messwerten eines kapazitiven Annäherungssensors zum Auslösen einer Betätigungsfunktion einer Heckklappe eines Kraftfahrzeugs mit einem energiesparenden Auswertemodus |
| PCT/EP2013/064124 WO2014016097A1 (de) | 2012-07-27 | 2013-07-04 | Verfahren zum erfassen und verarbeiten von messwerten eines kapazitiven annäherungssensors zum auslösen einer betätigungsfunktion einer heckklappe eines kraftfahrzeugs mit einem energiesparenden auswertemodus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2877376A1 true EP2877376A1 (de) | 2015-06-03 |
| EP2877376B1 EP2877376B1 (de) | 2016-04-27 |
Family
ID=48790406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP13736851.0A Active EP2877376B1 (de) | 2012-07-27 | 2013-07-04 | Verfahren zum erfassen und verarbeiten von messwerten eines kapazitiven annäherungssensors zum auslösen einer betätigungsfunktion einer heckklappe eines kraftfahrzeugs mit einem energiesparenden auswertemodus |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2877376B1 (de) |
| CN (1) | CN104411548B (de) |
| DE (1) | DE102012106851A1 (de) |
| WO (1) | WO2014016097A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8050876B2 (en) * | 2005-07-18 | 2011-11-01 | Analog Devices, Inc. | Automatic environmental compensation of capacitance based proximity sensors |
| DE102008063366B4 (de) * | 2008-12-30 | 2022-04-28 | Huf Hülsbeck & Fürst Gmbh & Co. Kg | Einrichtung zum berührungslosen Betätigen einer Heckklappe eines Kraftfahrzeugs sowie Verfahren zum Betätigen einer Heckklappe eines Kraftfahrzeuges und Kraftfahrzeug |
| DE102010011767A1 (de) * | 2010-03-17 | 2011-09-22 | Brose Fahrzeugteile Gmbh & Co. Kg, Hallstadt | Verfahren zur sensorischen Erfassung eines Bedienereignisses |
| CN201689305U (zh) * | 2010-05-14 | 2010-12-29 | 长沙泰辉网络科技有限公司 | 带密码键盘的电动车控制器 |
| CN201882043U (zh) * | 2010-11-25 | 2011-06-29 | 泉州市明佳电子科技有限公司 | 车用超声波探测器的电源控制电路 |
-
2012
- 2012-07-27 DE DE201210106851 patent/DE102012106851A1/de not_active Withdrawn
-
2013
- 2013-07-04 WO PCT/EP2013/064124 patent/WO2014016097A1/de not_active Ceased
- 2013-07-04 EP EP13736851.0A patent/EP2877376B1/de active Active
- 2013-07-04 CN CN201380035924.9A patent/CN104411548B/zh active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014016097A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104411548A (zh) | 2015-03-11 |
| CN104411548B (zh) | 2016-09-07 |
| WO2014016097A1 (de) | 2014-01-30 |
| DE102012106851A1 (de) | 2014-02-20 |
| EP2877376B1 (de) | 2016-04-27 |
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