EP1212209A2 - Verfahren zum bearbeiten und speichern von sensorsignalen, und entsprechend ausgelegte signalerfassungsvorrichtung - Google Patents
Verfahren zum bearbeiten und speichern von sensorsignalen, und entsprechend ausgelegte signalerfassungsvorrichtungInfo
- Publication number
- EP1212209A2 EP1212209A2 EP00954351A EP00954351A EP1212209A2 EP 1212209 A2 EP1212209 A2 EP 1212209A2 EP 00954351 A EP00954351 A EP 00954351A EP 00954351 A EP00954351 A EP 00954351A EP 1212209 A2 EP1212209 A2 EP 1212209A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- value
- sensor
- bits
- signal
- detection device
- 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.)
- Withdrawn
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
- B60R21/0132—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 responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D3/00—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups
- G01D3/02—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation
- G01D3/022—Indicating or recording apparatus with provision for the special purposes referred to in the subgroups with provision for altering or correcting the law of variation having an ideal characteristic, map or correction data stored in a digital memory
-
- 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
Definitions
- the invention relates to a method for processing and storing sensor signals and a correspondingly designed signal detection device.
- the invention is preferably used in a motor vehicle occupant protection system in the treatment of acceleration sensor signals, but can also be used to process the output signals from sensors of a different type.
- sensors are desired which have a high detection range (modulation range) of, for example, +/- 40 g (in the case of acceleration sensors) and which are also intended to offer high resolution, ie precise detection of intermediate values.
- the resolution is generally relatively low due to the limited maximum signal level swing.
- the change in the sensor signal voltage when there is a change in acceleration is only about 30 mV / g. If an analog / digital conversion with a high number of bits, for example 10 bits, is carried out in order to improve the detection accuracy, the storage space for the sensor signal output values is correspondingly high.
- the object of the invention is to create a method for processing and storing sensor signals which enables sensor signals to be stored with a relatively good resolution and a small storage space requirement.
- the sensor signals are subjected to a signal range shift with subsequent range stretching and subsequent storage with a reduced number of bits.
- Artificial increase in resolution is nevertheless essentially achieved again in the final storage with a reduced number of bits.
- "Storage with a reduced number of bits leads - without a greater loss of signal accuracy - to a significantly reduced storage space requirement, in particular when storing a large number of sensor signals, and also to a corresponding reduction in the computation and processing work involved in the subsequent further processing (for example algorithm calculation), since, for example only 8-bit signals have to be processed instead of 10-bit signals.
- an intermediate signal processing can take place before the final storage of the area-transformed sensor signal data, so that the area-processed data is not saved directly, but the intermediate-processed data is within the scope of the invention.
- the sensor output signal is preferably first subjected to a subtraction, so that the output value is reduced.
- the entire sensor signal output level range is thus shifted downward, preferably to zero.
- This also makes offset compensation possible and / or a zero point deviation compensation is reached.
- the subtraction result is then subjected to a multiplication by a factor greater than 1, so that the sensor output signal range shifted towards smaller values is now expanded.
- Subsequent storage with a reduced number of bits essentially reverses this artificial stretching, but the advantage of a reduced storage space requirement is achieved.
- the order of the subtraction and multiplication steps can also be exchanged, so that the sensor output signal is first multiplied and then subjected to a subtraction, the value to be subtracted in this case being the offset value and / or the zero point deviation value, multiplied by the same factor as that Sensor output signal.
- the procedure with initial subtraction and subsequent multiplication is preferred, since this ensures that even high sensor output signal values do not migrate out of the processable signal level range of, for example, a maximum of 5 V, and at the same time the multiplication effort is somewhat less.
- the signal detection device can be designed as a hardware circuit with subtractor and multiplier. However, the subtraction and multiplication are preferably carried out by means of appropriate programs of a signal processing processor, so that the hardware expenditure required is very low.
- Fig. 1 is a block diagram of an exemplary embodiment of the signal detection device
- Fig. 2 is a flowchart
- Fig. 3 is a signal representation of the invention.
- the signal detection device contains a sensor 1, which is followed by an analog / digital converter 2, which converts the analog sensor output signal into a digital signal with 10 bits, for example.
- an analog / digital converter 2 which converts the analog sensor output signal into a digital signal with 10 bits, for example.
- a / D converter 2 can also be modified, e.g. 8 bits or 12 bits.
- the A / D converter 2 is followed by an evaluation circuit, here in the form of a processor 3, which carries out the signal processing and possibly also signal evaluation and stores the sensor signal values, if necessary after processing, in a memory 4.
- step SI shows a flowchart for the mode of operation of the processor 3.
- the processor 3 cyclically queries the output of the A / D converter 2 at short intervals (step SI).
- step SI a specific value is subtracted from the digital sensor signal acquired in step ⁇ 1, which value is preferably selected such that the minimum useful signal level of the sensor signal is shifted to zero.
- a previously determined offset value is taken into account and compensated. If the minimum useful signal should have a level deviating from zero, ie there is a nominal zero point distance ⁇ O, this value is preferably also subtracted.
- a nominal zero-point distance ⁇ O is defined in a sensor-typical manner and is usually specified by the manufacturer in the sensor specifications.
- step S3 the digital value obtained as a result of step S2 is subjected to a multiplication by a factor of more than 1.
- This factor is preferably selected so that the sensor useful signal range, which was shifted down in step S2, is transformed, ie expanded, to the entire evaluable signal range from, for example, 0 V to 5 V.
- the factor should not exceed two digits and can be, for example, "1.5" or "2.4".
- a multiplication by a factor of 2 or 4, ie a power of 2 is preferred since the multiplication can then be carried out very simply, for example by shifting the subtraction result temporarily stored in a register by one or two digits in the direction of higher bit valency.
- the subtraction result is shifted by 1 position to the lower value and this value is then added to the undisplaced value.
- the access to the register can be changed or the weights assigned to the individual register positions can be redefined, for example for a multiplication with two bit positions are assigned a higher value by 1.
- steps S2 and S3 the number of bit positions determined by the A / D converter 2, for example 10 bits, is retained.
- step S4 the result obtained in step S3 is stored with a reduced number of bits, for example only 8 bits (e.g. the 8 highest bits of the result obtained in step S3).
- a reduced number of bits for example only 8 bits (e.g. the 8 highest bits of the result obtained in step S3).
- the loss of accuracy occurring here is reduced or even completely compensated for by the previous range expansion.
- Fig. 3 shows the sensor signal level range in the ideal case.
- Sensor 1 which is designed here as a bidirectional acceleration sensor, emits an output signal which varies in the range from 0 V to 5 V. This area is converted with 10 bits by the A / D converter 2.
- the sensor signal has a useful signal level range (nominal modulation range) 5, which for example ranges from 1.2 V to 3.8 V.
- the nominal zero distance ⁇ O is designated by 6 (from 0 to 1.2 V).
- the sensor is designed such that, in the ideal case, when there is no acceleration, it outputs a voltage which is in the middle of the nominal modulation range 5, ie 2.5 V here.
- the sensor output signal When accelerating in one direction of detection, the sensor output signal continuously decreases to the maximum detectable acceleration value of, for example, -38 g and thereby reaches a level of 1.2 V, at which it remains even if the acceleration is increased further. Conversely, if the acceleration occurs in the opposite direction, the output signal level increases up to the maximum detectable acceleration value of, for example, +38 g and thereby reaches the maximum useful signal level of 3.8 V.
- the sensor 1 regularly shows a voltage offset (offset) in relation to the actually expected values in terms of production technology or the current operating parameters. This offset 7 is shown schematically in FIG.
- this corresponds to a shift of the useful signal level range 5 downwards in such a way that the minimum useful signal level is shifted to 0 V.
- This shifted current sensor signal level is then subjected to multiplication by a factor X, so that the useful signal level is expanded, see FIG. 3d, "5x". It is also possible to choose the stretch even higher, ie to multiply by a factor of 2 or more, provided the maximum value does not exceed the permissible level range of normally 0 V to 5 V after the multiplication.
- the sensor signal level present after the multiplication is then stored in the memory 4 with a reduced number of bits, here 8 bits.
- the sensor should not have a zero distance ⁇ O, the subtraction of - ⁇ O is omitted. In any case, the sensor signal processing takes place with the higher bit position number of bits until the number of bits is then reduced during the final storage.
- the principle according to the invention is not only applicable to the acceleration sensor described above, but also to all other sensors, provided that they should have an offset deviation and / or a zero point distance ⁇ O, or only part of the useful signal level range has to be taken into account, i.e. an expansion of the area to be recorded is possible.
- the invention can also be used in cases in which a sensor should not show any offset deviation, but where there is a zero point distance ⁇ O. In this case, only the value ⁇ O is subtracted from the current sensor level, i.e. the minimum useful signal level is shifted to zero, and a multiplication is then carried out.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Technology Law (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19933981 | 1999-07-20 | ||
DE19933981 | 1999-07-20 | ||
PCT/DE2000/002382 WO2001005616A2 (de) | 1999-07-20 | 2000-07-20 | Verfahren zum bearbeiten und speichern von sensorsignalen, und entsprechend ausgelegte signalerfassungsvorrichtung |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1212209A2 true EP1212209A2 (de) | 2002-06-12 |
Family
ID=7915411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00954351A Withdrawn EP1212209A2 (de) | 1999-07-20 | 2000-07-20 | Verfahren zum bearbeiten und speichern von sensorsignalen, und entsprechend ausgelegte signalerfassungsvorrichtung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1212209A2 (de) |
WO (1) | WO2001005616A2 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10357870B4 (de) * | 2003-12-11 | 2013-02-07 | Robert Bosch Gmbh | Sensor mit symmetrischer Begrenzung eines Signals |
DE102006024312A1 (de) * | 2006-03-24 | 2007-09-27 | Conti Temic Microelectronic Gmbh | Vorrichtung und Verfahren zum Einstellen des Nutzbereichs einer Signalverarbeitungskette für ein Sensorelement-Ausgangssignal |
DE102006045893A1 (de) * | 2006-09-28 | 2008-04-03 | Siemens Ag | Automatische Verschiebung des Messwerterfassungsbereichs einer sensorischen Messeinrichtung |
DE102006054092B3 (de) * | 2006-11-16 | 2008-04-17 | Siemens Ag | Vorrichtung und Verfahren zum Auslösen eines Insassenschutzsystems |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4065664A (en) * | 1976-03-26 | 1977-12-27 | Norland Corporation | Floating point registers for programmed digital instruments |
JPS60110006A (ja) * | 1983-11-18 | 1985-06-15 | Ohkura Electric Co Ltd | 多重レンジ調節計 |
DE4009383A1 (de) * | 1990-03-23 | 1991-09-26 | Licentia Gmbh | Verfahren und anordnung zur analog-digital-umsetzung |
JPH0477900A (ja) * | 1990-07-13 | 1992-03-11 | Yokogawa Electric Corp | アナログ信号測定装置 |
DE4440305C2 (de) * | 1994-11-11 | 1997-04-17 | Siemens Ag | Verfahren zur schnellen digitalen Erfassung und Aufbereitung von analogen Meßwerten in einem Prozessor mit eingeschränkter binärer Wortbreite |
US5874909A (en) * | 1996-02-13 | 1999-02-23 | Texas Instruments Incorporated | Analog to digital video converter |
DE19609324A1 (de) * | 1996-03-09 | 1997-09-11 | Bosch Gmbh Robert | Verfahren zur Messung eines Spannungswerts, Meßvorrichtung zur Ausführung des Verfahrens und Verfahren zur Konfiguration der Meßvorrichtung |
-
2000
- 2000-07-20 WO PCT/DE2000/002382 patent/WO2001005616A2/de active Application Filing
- 2000-07-20 EP EP00954351A patent/EP1212209A2/de not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO0105616A3 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001005616A3 (de) | 2002-04-11 |
WO2001005616A2 (de) | 2001-01-25 |
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