WO2003077220A1 - Verfahren zur datenübertragung von einem sensor zu einer steuereinheit, sensor und steuereinheit - Google Patents
Verfahren zur datenübertragung von einem sensor zu einer steuereinheit, sensor und steuereinheit Download PDFInfo
- Publication number
- WO2003077220A1 WO2003077220A1 PCT/DE2002/003603 DE0203603W WO03077220A1 WO 2003077220 A1 WO2003077220 A1 WO 2003077220A1 DE 0203603 W DE0203603 W DE 0203603W WO 03077220 A1 WO03077220 A1 WO 03077220A1
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- WO
- WIPO (PCT)
- Prior art keywords
- values
- sensor
- control unit
- data
- absolute
- Prior art date
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/02—Electric signal transmission systems in which the signal transmitted is magnitude of current or voltage
Definitions
- the invention relates to a method for data transmission from a sensor to a control unit and a corresponding sensor and a corresponding control unit for restraint systems.
- the known current-based two-wire interface is used in a particularly simple manner for data transmission.
- a check of pressure sensors in a sensor system with a central control unit is made possible during ongoing operation if the transmission of absolute pressure values during ongoing operation of the system mixed with the transfer of differential pressure values.
- the absolute pressure values are only transmitted as long as there is no significant signal change in the differential pressure. As soon as this takes place, the current absolute pressure transmission is stopped and switched to differential pressure transmission. This does not affect system operation and the intended success, especially when used in conjunction with restraint systems.
- FIG. 1 shows an overview of a sensor system with a central control unit
- FIGS. 2 to 4 use flow diagrams to outline the procedure for data transmission in connection with pressure sensors, preferably in restraint systems.
- FIG. 1 shows a central control unit 10, which is connected to decentrally arranged sensors 12, 14, 16, 18, 20, 22.
- the sensors each consist of a sensor element (cf. 12a, etc.) and an interface module (cf. 12b, etc.), which is designed as an ASIC in the preferred exemplary embodiment and in which the procedure described below for program or sequence control Data transmission is implemented.
- the unidirectional data transmission in the preferred exemplary embodiment from the sensors to the central control unit takes place via two-wire lines 24 to 34, which are connected to the central control unit 10 and the decentralized sensors as part of a point-to-point connection.
- a bus connection is used in other exemplary embodiments.
- a preferred application of the system shown in FIG. 1, the number of sensors being able to differ from that shown in FIG. 1, is in connection with restraint systems for automobiles.
- the sensors are pressure sensors that detect a pressure exerted on them. On the basis of this measured absolute pressure, it is not possible for a single pressure sensor to assess whether the pressure information obtained is correct.
- the central control unit has a plurality of pressure information items from a plurality of pressure sensors, which work with one another do not communicate, but transmit all their pressure values to the central control unit. It is therefore able, on the basis of the absolute pressure values of the individual sensors, to compare them with one another for plausibility and to derive malfunctions.
- the absolute pressure values of the individual sensors must be within a defined tolerance band with one another if they function correctly. On this basis, the absolute pressure values in the central control unit can be compared and checked for plausibility in restraint systems.
- step 100 the absolute measured values PABS1 to PABSn provided by the sensors (n is the number of sensors) are read.
- a pressure reference value Pref is then formed in step 102. Depending on the version, this is either one of the sensor pressure values or a mean value of sensor pressure values, etc.
- step 104 the individual pressure sensor values are compared with the reference value. It is then checked in step 106 whether there is an impermissible deviation between a sensor value and the reference value. If this is the case, an error in the pressure sensor concerned is determined in accordance with step 108, while if there is no impermissible deviation, that is to say if all sensor signals are within a predetermined tolerance band, error-free operation is assumed.
- the sensors are checked in the initialization phase on the basis of the transmitted absolute pressure values.
- This embodiment is outlined using the flow chart of FIG. 2. This describes the process in the interface module of a pressure sensor.
- the pressure measurement value is read in in the first step 200. This is then transmitted to the central control unit in accordance with step 202. Then in step 204 it is checked whether the initialization phase has ended. If this is not the case, steps 200 and 202 are repeated. Otherwise, the pressure measurement value is read in in step 206 and the differential pressure value Pdiff is formed in step 208. This is done, for example, by forming differences in the pressure measurement value and a reference pressure value, for example an average value for pressure values measured earlier. The differential pressure value is then transmitted in step 210. Steps 206 to 210 are repeated until the operating cycle has ended, for example by switching off the supply voltage. This ensures a continuous transfer of the differential pressure value.
- a point-to-point interface to each sensor or a bus system connected to all components is provided as the interface between the sensors and the central control unit.
- a point-to-point interface it has proven to be suitable in a preferred exemplary embodiment to provide a current-based two-wire interface as outlined in the prior art mentioned at the beginning.
- the first exemplary embodiment outlined above describes the transmission of absolute pressure values in the initialization phase. With such an implementation, it is not possible to check the sensor function during operation. Therefore, in the context of a second exemplary embodiment, it is alternatively or additionally provided to allow the absolute pressure value to be transmitted even during operation and thereby to enable fault detection in the sensor system in the manner shown above, even while the system is in operation.
- Absolute pressure values are only transmitted as long as there is no significant signal change on the differential pressure. As soon as such a differential pressure change is detected, the sensor immediately stops the possibly running absolute pressure transmission and switches to differential pressure transmission. This measure ensures that no system performance is lost due to the additional transmission of absolute pressure values.
- the interface between the sensor and the central control unit represents a current-based two-wire interface, as is known from the prior art mentioned at the beginning.
- the distinction between absolute pressure data and differential pressure data is made once by appropriately identifying the data with different identification codes.
- the absolute pressure value is encoded in a data word whose value range outside the value range of the user data (differential pressure).
- the absolute pressure values therefore consist of a combination of identification code and data word, with both the identification code and the data word being outside the data range of the differential pressure values. This ensures that the absolute pressure values are not confused with regular differential pressure values.
- the value range for the data transmission is essentially divided into three, as mentioned in the prior art mentioned at the outset, a central area comprising the useful data, in the present case the differential pressure data, the areas outside the useful data area comprising status information, identification data, etc.
- a central area comprising the useful data
- the areas outside the useful data area comprising status information, identification data, etc.
- the absolute pressure data word is divided and sent with a corresponding identifier in several portions.
- the absolute pressure value is understood to mean the currently measured pressure value, while an average value from past measured pressure values, which is related to the currently measured pressure value, is used to form the differential pressure value.
- FIG. 4 shows a flow chart in which the flow on the sensor side for the transmission of differential pressure values and absolute pressure values is outlined during operation. The sequence outlined in FIG. 4 takes place at predetermined time intervals. First, the current pressure measurement value PMess is read in in the first step 300. The reference pressure value PREF is then formed in step 302 on the basis of past values and the differential pressure value PDIFF is formed in step 304 on the basis of the currently measured and the reference pressure value.
- this can also be supplied with additional standardization, which normalizes the differential pressure value, for example, to an average of past differential pressure values. It is then determined in step 306 based on the current differential pressure value and one or more past differential pressure values whether there is a significant signal change. If this is the case, any transmission of absolute pressure values that may be running is stopped, the current differential pressure value in the first value range that is available for data transmission is encoded as a data word, the corresponding identifier is selected and the identifier and data word are sent in accordance with step 310.
- step 312 the absolute measured value PMESS is encoded as a data word in a second value range which is available for data transmission. If the word width is restricted in the respective application, the data word is broken down into several subsections, the corresponding identifiers are selected and the data transmission in accordance with step 314 consisting of identifier and data word is carried out in several sections. Then the process described is repeated in the next time interval.
- pressure sensors are not restricted to pressure sensors, but is used wherever decentralized sensors of the same type send differential values as user data to a common central unit without the possibility of self-testing.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50212304T DE50212304D1 (de) | 2002-03-08 | 2002-09-24 | Verfahren zur datenübertragung von einem sensor zu einer steuereinheit, sensor und steuereinheit |
EP02776716A EP1485895B1 (de) | 2002-03-08 | 2002-09-24 | Verfahren zur datenübertragung von einem sensor zu einer steuereinheit, sensor und steuereinheit |
US10/477,314 US7246028B2 (en) | 2002-03-08 | 2002-09-24 | Method for transmitting data from sensor to a control unit, and a corresponding sensor and control unit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10210131.0 | 2002-03-08 | ||
DE10210131A DE10210131A1 (de) | 2002-03-08 | 2002-03-08 | Verfahren zur Datenübertragung von einem Sensor zu einer Steuereinheit, Sensor und Steuereinheit |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003077220A1 true WO2003077220A1 (de) | 2003-09-18 |
Family
ID=27762777
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/003603 WO2003077220A1 (de) | 2002-03-08 | 2002-09-24 | Verfahren zur datenübertragung von einem sensor zu einer steuereinheit, sensor und steuereinheit |
Country Status (4)
Country | Link |
---|---|
US (1) | US7246028B2 (de) |
EP (1) | EP1485895B1 (de) |
DE (2) | DE10210131A1 (de) |
WO (1) | WO2003077220A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10229702A1 (de) * | 2002-07-02 | 2004-01-29 | Endress + Hauser Gmbh + Co. Kg | Transmitter |
DE10237162A1 (de) | 2002-08-14 | 2004-02-26 | Robert Bosch Gmbh | Vorrichtung zur Aufprallsensierung |
DE102004034133A1 (de) * | 2004-07-15 | 2006-02-02 | Hella Kgaa Hueck & Co. | Verfahren zur Erhöhung der Auflösung bei der Übertragung von Sensorsignalen zwischen einem Sender und zumindest einem Empfänger und Vorrichtung sowie Anordnung zur Durchführung des Verfahrens |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4058975A (en) * | 1975-12-08 | 1977-11-22 | General Electric Company | Gas turbine temperature sensor validation apparatus and method |
US5691714A (en) * | 1994-12-09 | 1997-11-25 | Mehnert; Walter | Process for the serial transmission of digital measurement values |
US5870695A (en) * | 1993-09-20 | 1999-02-09 | Rosemount Inc. | Differential pressure measurement arrangement utilizing remote sensor units |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5416706A (en) * | 1984-04-27 | 1995-05-16 | Hagenbuch; Leroy G. | Apparatus for identifying containers from which refuse is collected and compiling a historical record of the containers |
US5301122A (en) * | 1992-02-12 | 1994-04-05 | Measuring And Monitoring, Inc. | Measuring and monitoring system |
GB9408574D0 (en) * | 1994-04-29 | 1994-06-22 | Newbridge Networks Corp | Atm switching system |
US5710723A (en) * | 1995-04-05 | 1998-01-20 | Dayton T. Brown | Method and apparatus for performing pre-emptive maintenance on operating equipment |
US7426429B2 (en) * | 1998-04-27 | 2008-09-16 | Joseph A Tabe | Smart seatbelt control system |
US6577986B1 (en) * | 1999-12-20 | 2003-06-10 | General Electric Company | Method and system for determining measurement repeatability and reproducibility |
IT1318137B1 (it) * | 2000-07-07 | 2003-07-23 | Cit Alcatel | Metodo ed apparato per controllare e supervisionare dispositivielettronici. |
US20020072809A1 (en) * | 2000-10-24 | 2002-06-13 | Michael Zuraw | Microcomputer control of physical devices |
US20040124697A1 (en) * | 2000-12-04 | 2004-07-01 | Macgregor G. David | Vehicle brake safety system apparatus and methods |
DE10114504A1 (de) | 2001-03-23 | 2002-10-02 | Bosch Gmbh Robert | Verfahren zur Übertragung von Daten von wenigstens einem Sensor zu einem Steuergerät |
DE10149332A1 (de) | 2001-10-06 | 2003-04-30 | Bosch Gmbh Robert | Verfahren zur Übertragung von Daten von wenigstens einem Sensor zu einem Steuergerät |
JP3967599B2 (ja) * | 2002-01-28 | 2007-08-29 | 株式会社デンソー | 車両用電子制御装置 |
-
2002
- 2002-03-08 DE DE10210131A patent/DE10210131A1/de not_active Withdrawn
- 2002-09-24 DE DE50212304T patent/DE50212304D1/de not_active Expired - Lifetime
- 2002-09-24 EP EP02776716A patent/EP1485895B1/de not_active Expired - Lifetime
- 2002-09-24 WO PCT/DE2002/003603 patent/WO2003077220A1/de active IP Right Grant
- 2002-09-24 US US10/477,314 patent/US7246028B2/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4058975A (en) * | 1975-12-08 | 1977-11-22 | General Electric Company | Gas turbine temperature sensor validation apparatus and method |
US5870695A (en) * | 1993-09-20 | 1999-02-09 | Rosemount Inc. | Differential pressure measurement arrangement utilizing remote sensor units |
US5691714A (en) * | 1994-12-09 | 1997-11-25 | Mehnert; Walter | Process for the serial transmission of digital measurement values |
Also Published As
Publication number | Publication date |
---|---|
EP1485895B1 (de) | 2008-05-21 |
DE10210131A1 (de) | 2003-09-18 |
US20040204890A1 (en) | 2004-10-14 |
DE50212304D1 (de) | 2008-07-03 |
EP1485895A1 (de) | 2004-12-15 |
US7246028B2 (en) | 2007-07-17 |
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