WO2005012924A1 - Aufprallsensor und verfahren zum testen eines aufprallsensors - Google Patents
Aufprallsensor und verfahren zum testen eines aufprallsensors Download PDFInfo
- Publication number
- WO2005012924A1 WO2005012924A1 PCT/DE2004/001479 DE2004001479W WO2005012924A1 WO 2005012924 A1 WO2005012924 A1 WO 2005012924A1 DE 2004001479 W DE2004001479 W DE 2004001479W WO 2005012924 A1 WO2005012924 A1 WO 2005012924A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter
- signal
- impact sensor
- sensor
- correction
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/007—Malfunction diagnosis, i.e. diagnosing a sensor defect
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
- B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
- B60R2021/01122—Prevention of malfunction
- B60R2021/01184—Fault detection or diagnostic circuits
Definitions
- the invention is based on an impact sensor or a driving test for testing an impact sensor according to the preamble of the independent claims.
- the impact sensor according to the invention and the driving method according to the invention for testing an impact sensor with the features of the independent claims have the advantage that a test signal is now specifically applied to the filter, preferably a low-pass filter, which is used for filtering the sensor signal, and then perform a filter correction depending on the response signal to the test signal.
- the filter preferably a low-pass filter
- the error if it exists, is also corrected immediately.
- filters which are preferably manufactured in hardware, there may be a deviation of + 10% due to manufacturing tolerances.
- the filter correction is achieved by a software filter that is connected directly after the filter.
- the threshold can then be provided with a surcharge, or the signal that enters the algorithm can be provided with a surcharge or discount.
- the software filter is implemented directly by the impact sensor.
- this software filter can already be implemented there by the sensor electronics themselves, for example by means of control logic or a switching mechanism.
- the filter correction is advantageously carried out after each reset of the impact sensor. This enables continuous monitoring and control as well as correction of the impact sensor.
- the deviations of the filter are monitored over a longer period of time in order to identify trends and to detect such deviations identify those that are so far from the target value that an exchange of the impact sensor or the filter or the control unit is indicated.
- a signal is generated, for example the switching on of a warning lamp or a message to a remote maintenance.
- a step function can be used as the test signal, which is particularly easy to generate and provides a large amount of information in the response signal about the behavior of the filter.
- FIG. 1 shows a first block diagram
- FIG. 2 shows a second block diagram
- FIG. 3 shows a first flow diagram
- FIG. 4 shows a second flow diagram
- FIG. 5 shows a third block diagram
- FIG. 6 shows a first signal curve
- Figure 7 shows a second waveform
- Figure 8 shows a third waveform
- Low-pass filters for filtering the signal of the impact sensor are usually used in central or peripheral crash or impact sensors. This is necessary because the impact sensors transmit signals with a certain frequency spectrum. Only a part of it is really relevant for crash discrimination, while higher-frequency parts in particular are rather disruptive. In the case of resonances, it is even imperative to eliminate these signals from the spectrum, since they would otherwise cause serious measurement errors.
- a band-pass filter is also possible. These low-pass filters are implemented directly in hardware, since otherwise a too high sampling rate would be necessary to avoid aliasing effects. Due to the design with discrete components, in particular semiconductors, a filter tolerance in the range of 10% on the cut-off frequency is typically to be observed, since the individual
- the filter characteristic can then be corrected by a further process, for example a software filter.
- This correction with a software filter can either be carried out directly by the impact sensor itself, which is then a self-correcting sensor, or else by the control unit.
- a step function is used as the test signal.
- the jump function and the associated ideally filtered jump response are stored in the impact sensor or in the control unit.
- the step function is filtered with the filter and compared with the ideal target step response.
- the necessary correction is determined and stored in the impact sensor or the control unit.
- the software filter for correction thus generated then additionally filters the signals filtered with the filter from the sensors during normal operation of the impact sensor.
- the filter correction can be determined anew each time during the initialization phase after a reset and can always be stored in a memory. With each newly determined correction, a comparison can be made with the old one, so that the impact sensor can independently recognize changes, for example due to aging and environmental influences.
- a warning lamp can, for example, indicate that the Restraint system sensors must be checked the next time you visit the workshop.
- a service flag can be set that the customer does not see himself, but this defect is recognized when reading out in the workshop and the corresponding aged impact sensor can be replaced.
- a signal is sent to a remote maintenance via a radio link to indicate this defect.
- a simpler signal can also be used as the test signal, for example a signal that is zero everywhere, the first data value being one. This is, so to speak, a delta function normalized to one, which has all possible discrete frequencies in the spectrum with an amplitude of one.
- the filter's transfer function directly if you calculate the absolute value (magnitude).
- Two Fourier spectra of two different low-pass filters can be seen in FIG. 8. This signal has the advantage that the associated spectrum has all possible discrete frequencies with the same amplitude one. You can now filter this test signal and use criteria such as FWHM (Filling Width at Half Maximum), 10-90 criterion or similar to determine the deviation of the filter characteristic and derive the necessary corrections from it.
- the transform of the filtered test signal is only calculated for a certain frequency by, for example, folding with a sine or cosine function. This takes place in the time continuum, ie the integrals are calculated discretely, so essentially only additions have to be carried out, which leads to a high computing speed. Due to the deviation obtained at only one frequency, the required correction can be made in, for example, using a look-up table can be easily determined.
- the folding can be further simplified if so-called Walsh functions can be used instead of the sine or cosine functions. The computing effort is reduced to a small number of additions and subtractions.
- the sensor signals are not corrected using a dedicated software filter, but the deviation is determined, but is used to adapt the parameters of the thresholds in the algorithm to the deviating sensor data.
- the signal itself which is examined in the algorithm, can also be changed accordingly.
- FIG. 1 shows the impact sensor according to the invention in a first block diagram.
- the measuring amplifier 2 is connected to a switch 3, which in turn is connected to a low-pass filter 5.
- the low-pass filter 5 is in turn connected to a module 6, in which an analog-digital converter is integrated and a further digital control logic.
- the module 6 is then connected to a control device via an output and to a further logic module 7 via a data input / output.
- the module 7 is connected via a first data output to a logic module 4 which is connected to the switch 3.
- the module 7 is connected to a warning lamp 8 via a second data output.
- module 7 controls module 4 to actuate switch 3 such that signals from amplifier 2 no longer reach filter 5, but now signals from module 4 to filter 5.
- These signals from module 4 are test signals , for example a step function, to test the low-pass filter 5.
- the module 6 is also informed by the module 7 that the test phase for the filter 5 now takes place, so that the signal, that is to say the response signal of the filter 5, then turns on digitized, the test signal is transmitted from module 6 to module 7 in order to carry out a comparison there, namely of the response signal with a target response signal.
- the deviation that module 7 determines in this comparison leads to a software filter that is intended to correct this deviation.
- This software filter is integrated in module 6.
- the module 7 checks this deviation to determine whether this absolute deviation is so large that an exchange of the impact sensor is indicated. In this case, the module 7 actuates the warning lamp 8.
- the elements 1 to 7 can all be arranged in a housing, for example in a peripheral acceleration sensor.
- the warning lamp 8 is usually arranged in the instrument panel of the vehicle. Instead of one
- Software filter can also be transmitted to the control unit via the module 6, so that the control unit either implements the software filter itself or parameterizes its algorithm for triggering restraint devices in such a way that this correction is taken into account in the algorithm. This can be done, for example, by changing the thresholds or by adding or
- FIG. 2 shows a second block diagram of the impact sensor according to the invention. This time the correction is carried out by the control unit.
- a sensor element 20, which is arranged, for example, in the central airbag control unit, supplies its signal to an amplifier 21.
- the amplifier 21 is connected to a switch 22, which is connected to the low-pass filter 23.
- the low-pass filter 23 is connected to a logic module 24, which here is the microcontroller in the control unit.
- the microcontroller 24 has an analog input in order to accept the signal of the low-pass filter 23. In the case of the test, the microcontroller 24 activates the logic module 25, so that the
- Switch 22 is operated such that the signals from amplifier 21 no longer reach low-pass filter 23.
- a test signal which is stored in the module 25, is transmitted to the low-pass filter 23 and the microcontroller 24 carries out the comparison and evaluation of the response signal to this test signal. Again, the response signal is compared to a target response signal by the
- the correction then takes place, as described above, using a software filter or the suitable parameterization of the triggering algorithm.
- FIG. 3 explains the method according to the invention for testing an impact sensor in a flow chart.
- an event occurs that tests the Filters triggers. This testing can be a reset of the impact sensor or a predetermined initialization phase.
- the test signal is then applied to the low-pass filter in order to obtain the response signal in method step 302, which is digitized via an analog-digital converter, in order then to evaluate it digitally.
- this response signal is now switched off
- Method step 302 compared with a target response signal. If the deviation is zero or very small, no correction is made and the method jumps to step 304 to end the method. However, if there is a clear deviation, a correction is carried out in method step 305 either by means of a software filter or by suitable parameterization of the triggering algorithm.
- FIG. 4 explains the method according to the invention for testing an impact sensor in a second flow chart.
- method step 400 the difference between the response signal and the target response signal is determined.
- method step 401 this difference is compared with a threshold value. If the difference is above this
- Threshold value then, in step 402, a warning is issued either, as illustrated above, by the lighting of a warning lamp, or a signal, a voice signal or a message to a remote maintenance. If the difference is still below the threshold value, the development of the deviations over time is examined in method step 403. In step 404, a check is then carried out to determine whether a trend is emerging, for example a continuous aging. This can be expressed in a linear increase in the error of the filter. However, the increase can also take place according to other functions such as a power function. If this is the case, then a signal is generated again in method step 405, for example to activate remote maintenance. There was no trend in the procedural step
- FIG. 5 shows the basic configuration of a restraint system in a third block diagram.
- a control device 53 for the restraint means such as airbags, belt tensioners or roll bars, receives a swapped out via a first data input
- the outsourced sensors are, for example, acceleration sensors or pressure sensors or contact sensors or pre-crash sensors. Combinations of these Sensors are possible.
- the method according to the invention can be used for the impact sensors, such as acceleration or pressure sensors or other contact sensors, since these sensors use a low-pass filter to filter their signals.
- FIG. 6 shows in a first diagram a test signal as well as the filtered test signal and the target response.
- a step function 62 is used here as a test signal.
- Curve 60 is the filtered jump function, while curve 61 is the ideal response function.
- the signal from a pressure sensor was used, where there is an instantaneous pressure increase of 1000 mbar to 1200 mbar. The deviation between the curves 60 and 61 then determines the correction, for example in the software filter.
- FIG. 7 explains an alternative test function in a second diagram, the first data value being 1 and the remaining data values being zero.
- Curve 70 represents the filtered test function, while curve 71 is the target response.
- the deviation can be determined here by comparing the curves using various criteria, such as peak height and a drop to half or a 10-90 criterion.
- FIG. 8 shows in a last diagram the determination of the deviation of the filter corner frequency on the basis of the frequency spectrum of a test function.
- a standardized sample test function is used here.
- the first data value is 1 and the rest
- the function contains all possible discrete frequencies with the amplitude 1.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Mechanical Engineering (AREA)
- Air Bags (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006521385A JP2007500337A (ja) | 2003-07-28 | 2004-07-08 | 衝突センサおよび衝突センサのテスト方法 |
US10/565,182 US7305863B2 (en) | 2003-07-28 | 2004-07-08 | Impact sensor and method for testing the same |
EP04738895A EP1658507A1 (de) | 2003-07-28 | 2004-07-08 | Aufprallsensor und verfahren zum testen eines aufprallsensors |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10334235.4 | 2003-07-28 | ||
DE10334235A DE10334235A1 (de) | 2003-07-28 | 2003-07-28 | Aufprallsensor und Verfahren zum Testen eines Aufprallsensors |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005012924A1 true WO2005012924A1 (de) | 2005-02-10 |
Family
ID=34071936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2004/001479 WO2005012924A1 (de) | 2003-07-28 | 2004-07-08 | Aufprallsensor und verfahren zum testen eines aufprallsensors |
Country Status (5)
Country | Link |
---|---|
US (1) | US7305863B2 (de) |
EP (1) | EP1658507A1 (de) |
JP (1) | JP2007500337A (de) |
DE (1) | DE10334235A1 (de) |
WO (1) | WO2005012924A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1870688A1 (de) * | 2006-06-22 | 2007-12-26 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Funktionsprüfung eines Druckaufnehmers |
WO2008017535A1 (de) * | 2006-08-08 | 2008-02-14 | Robert Bosch Gmbh | Vorrichtung, verfahren und steuergerät zur seitenaufprallerkennung und drucksensor |
WO2008031376A1 (de) * | 2006-09-15 | 2008-03-20 | Conti Temic Microelectronic Gmbh | Verfahren zur funktionsprüfung einer sensoreinheit sowie fahrzeugsteuergerät mit einer solchen sensoreinheit |
DE102012022512A1 (de) * | 2012-11-16 | 2014-05-22 | Audi Ag | Verfahren zur Überprüfung von Sensoren eines Kraftfahrzeugs |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007041847A1 (de) * | 2007-09-03 | 2009-03-05 | Robert Bosch Gmbh | Steuergerät und Verfahren zur Ansteuerung von Personenschutzmitteln |
US20100179731A1 (en) * | 2009-01-15 | 2010-07-15 | Ford Global Technologies, Llc | System and method for performing vehicle side impact sensing with unit area impulse technique |
DE102010061949A1 (de) * | 2010-11-25 | 2012-05-31 | Siemens Aktiengesellschaft | Verfahren und Anordnung zur Überwachung von motorisch bewegbaren Anlageteilen |
Citations (5)
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US5506454A (en) * | 1991-03-20 | 1996-04-09 | Hitachi, Ltd. | System and method for diagnosing characteristics of acceleration sensor |
US5513878A (en) * | 1991-12-24 | 1996-05-07 | Mitsubishi Denki Kabushiki Kaisha | Electronic system for activating a vehicle rider protection apparatus |
DE10007422A1 (de) * | 2000-02-18 | 2001-09-06 | Siemens Ag | Verfahren und Vorrichtung zum Überprüfen einer Sensoreneinrichtung, insbesondere einer in einem Fahrzeuginsassen-Schutzsystem enthaltenen Beschleunigungssensoreinrichtung |
US6470249B1 (en) * | 1998-03-13 | 2002-10-22 | Siemens Aktiengesellschaft | Vehicle occupant protection system for a motor vehicle and method for controlling the triggering of the vehicle occupant protection system |
DE10122922A1 (de) * | 2001-05-11 | 2002-11-14 | Mgp Instr Gmbh | Verfahren und Filtereinrichtung zur Fluktuatiuonsunterdrückung bei Meßdaten |
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US6705151B2 (en) * | 1995-05-30 | 2004-03-16 | Matsushita Electric Industrial Co., Ltd. | Angular velocity sensor |
US6047226A (en) * | 1997-06-26 | 2000-04-04 | Hughes Electronics Corporation | Enhanced stellar attitude determination system |
US7057503B2 (en) * | 2002-03-19 | 2006-06-06 | Automotive Systems Laboratory, Inc. | Vehicle rollover detection system |
-
2003
- 2003-07-28 DE DE10334235A patent/DE10334235A1/de not_active Withdrawn
-
2004
- 2004-07-08 JP JP2006521385A patent/JP2007500337A/ja active Pending
- 2004-07-08 WO PCT/DE2004/001479 patent/WO2005012924A1/de active Application Filing
- 2004-07-08 US US10/565,182 patent/US7305863B2/en not_active Expired - Fee Related
- 2004-07-08 EP EP04738895A patent/EP1658507A1/de not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5506454A (en) * | 1991-03-20 | 1996-04-09 | Hitachi, Ltd. | System and method for diagnosing characteristics of acceleration sensor |
US5513878A (en) * | 1991-12-24 | 1996-05-07 | Mitsubishi Denki Kabushiki Kaisha | Electronic system for activating a vehicle rider protection apparatus |
US6470249B1 (en) * | 1998-03-13 | 2002-10-22 | Siemens Aktiengesellschaft | Vehicle occupant protection system for a motor vehicle and method for controlling the triggering of the vehicle occupant protection system |
DE10007422A1 (de) * | 2000-02-18 | 2001-09-06 | Siemens Ag | Verfahren und Vorrichtung zum Überprüfen einer Sensoreneinrichtung, insbesondere einer in einem Fahrzeuginsassen-Schutzsystem enthaltenen Beschleunigungssensoreinrichtung |
DE10122922A1 (de) * | 2001-05-11 | 2002-11-14 | Mgp Instr Gmbh | Verfahren und Filtereinrichtung zur Fluktuatiuonsunterdrückung bei Meßdaten |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1870688A1 (de) * | 2006-06-22 | 2007-12-26 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren zur Funktionsprüfung eines Druckaufnehmers |
WO2008017535A1 (de) * | 2006-08-08 | 2008-02-14 | Robert Bosch Gmbh | Vorrichtung, verfahren und steuergerät zur seitenaufprallerkennung und drucksensor |
US8504237B2 (en) | 2006-08-08 | 2013-08-06 | Robert Bosch Gmbh | Device, method, and control unit for identifying a side impact, and pressure sensor |
KR101310421B1 (ko) | 2006-08-08 | 2013-09-24 | 로베르트 보쉬 게엠베하 | 측면 충돌 인식을 위한 장치, 방법 및 제어 장치와 압력 센서 |
WO2008031376A1 (de) * | 2006-09-15 | 2008-03-20 | Conti Temic Microelectronic Gmbh | Verfahren zur funktionsprüfung einer sensoreinheit sowie fahrzeugsteuergerät mit einer solchen sensoreinheit |
DE102012022512A1 (de) * | 2012-11-16 | 2014-05-22 | Audi Ag | Verfahren zur Überprüfung von Sensoren eines Kraftfahrzeugs |
DE102012022512B4 (de) * | 2012-11-16 | 2018-01-04 | Audi Ag | Verfahren zur Überprüfung von Sensoren eines Kraftfahrzeugs |
Also Published As
Publication number | Publication date |
---|---|
US7305863B2 (en) | 2007-12-11 |
EP1658507A1 (de) | 2006-05-24 |
US20060236745A1 (en) | 2006-10-26 |
DE10334235A1 (de) | 2005-02-17 |
JP2007500337A (ja) | 2007-01-11 |
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