EP1238495A2 - Datenaustausch auf einem datenbus - Google Patents
Datenaustausch auf einem datenbusInfo
- Publication number
- EP1238495A2 EP1238495A2 EP00990534A EP00990534A EP1238495A2 EP 1238495 A2 EP1238495 A2 EP 1238495A2 EP 00990534 A EP00990534 A EP 00990534A EP 00990534 A EP00990534 A EP 00990534A EP 1238495 A2 EP1238495 A2 EP 1238495A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- bus
- data
- branches
- bus line
- state
- 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- Withdrawn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
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000001514 detection method Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40169—Flexible bus arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
Definitions
- the invention relates to a method for data exchange on a data bus and a data bus with at least one bus line with defined levels for a dominant and a recessive state, in particular for motor vehicle technology.
- a communication network for a vehicle in which an erroneous operation of control devices is to be prevented.
- a large number of control devices are connected to bus bars.
- the bus bars can be connected to one another and separated from one another via a switching device, so that the control devices can be separated into groups that use different communication methods.
- the patent specification EP 0 412 085 B1 relates to a network interface in which an interruption or short circuit on the bus line connected to the network interface can be detected even when the network work interface is in an inactivated operating mode ("sleep ode"). It is an object of the invention to provide a method for data exchange on a data bus and a data bus which allow at least partial maintenance of the data exchange, even if a fault has occurred on a bus line.
- At least one data exchange can take place in the event of a fault on a bus line in which the bus level is incorrectly present (stuck at dominant state or stuck at recessive state) or in which the undefined level is present to be continued on a bus branch.
- a fault can occur, for example, in the event of a local short circuit to ground or an external short circuit to a power supply.
- the bus branches are reconnected when the error disappears or when the data bus is reset when it is switched on again.
- the bus branches can only be connected when the device is switched on again.
- the data exchange on the data bus is preferably carried out using pulse-code-modulated data m NRZ (no return to zero) and bit stuffing to interrupt long high or low bit sequences.
- bit stream can be encoded by means of a self-synchronizing coding.
- Preferred areas of application of the invention are safety-relevant applications in motor vehicles, such as, for example, a data bus for an electromechanical brake or steering,
- An bus branch advantageously connects two actuators of an electromechanical brake. This means that two wheels can be braked by a bus branch that has remained intact, similar to a conventional hydraulic dual-circuit system.
- the actuators connected by the bus branch are preferably arranged diagonally on different vehicle axles.
- the figure shows a data bus with an isolating circuit.
- the data bus shown has two bus lines 1 and 2 for connecting bus subscribers or computing units (not shown).
- the computing units are connected in parallel to the data bus.
- the computing units are control systems and controllers connected to them, which issue received control commands to electric motors that actuate wheel brakes.
- Data is transmitted on the bus lines by switching between defined levels for a dominant state and for a recessive state.
- the dominant state is the higher priority state. In the present case, a voltage of 3.5 V is applied to one bus line and a voltage of 1.5 V to the other bus line in the dominant state. In the recessive state, both bus lines are supplied with 2.5V. This corresponds to the "unoccupied" state. If the dominant state and the recessive state occur simultaneously, the dominant state consequently "overwrites" the recessive state.
- the connected computing units cause a change between the dominant state and the recessive state for data transmission.
- the dominant state can be a certain voltage or current level to which the logic state high or low is assigned. The level is formed from the difference between the levels on the two bus lines 1 and 2.
- the bus lines 1, 2 are monitored by an isolating circuit 3.
- the isolating circuit 3 comprises a monitoring logic 31 for recognizing a dominant state which persists in an erroneous manner, which is referred to below as SADS (stuck at dominant state).
- SADS sleep at dominant state
- An SADS error occurs when a defective bus subscriber or an electrical contact between the power supply line and a bus line (external fault) causes the dominant state to be present for longer than a defined time interval. The time interval is determined depending on the coding.
- the monitoring logic 31 contains a receiver or a transceiver 311 and a status monitoring 312.
- the status monitoring 312 permanently monitors the logic level which is transmitted from the transceiver 311 to the status monitoring 312 on a receiving line.
- An SADS error is detected by the status monitor 312, which monitors the receive line. If the bit representation on the reception line, which corresponds to the dominant state, is present longer than a predetermined time interval, then a SADS error is recognized.
- the isolating circuit 3 has a measuring unit 32 for recognizing a recessive state which is erroneously persistent, which is referred to below as SARS (stuck at recessive state).
- SARS spike at recessive state
- An SARS error occurs when as a result of an external short circuit or a short circuit, the dominant state can no longer be set.
- This error is recognized by the measuring unit 32 through a resistance measurement.
- the resistance between the two bus lines 1 and 2 is specified by the terminating resistors.
- the resistance measurement must not impair communication on the bus lines. This is ensured by a known diode resistance circuit, not shown in the figure. This enables a resistance measurement to be carried out at any time.
- a switch control 33 separates the data bus into two bus branches 11 and 21 via isolating switches 34 and 35 if the monitoring logic has detected an SADS error or the measuring unit 32 has detected a SARS error.
- the isolating switches 34 and 35 are each switched to a terminating resistor 36 or 37.
- the two bus lines 1 and 2 are connected to one another via the terminating resistors and consequently terminated correctly. Since a single error can affect only one of the bus branches 11 or 21, it is possible to maintain data exchange on the other bus branch. This is particularly useful if a control unit that controls actuators connected to the bus lines is either designed redundantly for each bus branch or has separate connections to the bus branches.
- bus branches 11 and 21 are interconnected when the system is reset as a result of the system being switched off and on again (power-on reset).
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1999160800 DE19960800A1 (de) | 1999-12-16 | 1999-12-16 | Datenaustausch auf einem Datenbus |
| DE19960800 | 1999-12-16 | ||
| PCT/DE2000/004462 WO2001044012A2 (de) | 1999-12-16 | 2000-12-14 | Datenaustausch auf einem datenbus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1238495A2 true EP1238495A2 (de) | 2002-09-11 |
Family
ID=7932961
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00990534A Withdrawn EP1238495A2 (de) | 1999-12-16 | 2000-12-14 | Datenaustausch auf einem datenbus |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1238495A2 (de) |
| DE (1) | DE19960800A1 (de) |
| WO (1) | WO2001044012A2 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009012939B4 (de) * | 2009-03-12 | 2012-04-26 | Volkswagen Ag | Verfahren und Vorrichtung zur Übertragung von drei unabhängigen, digitalen Sensorsignalen |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5187709A (en) * | 1990-05-08 | 1993-02-16 | Caterpillar Inc. | Fault tolerant serial communications network |
| DE4429953B4 (de) * | 1994-08-24 | 2012-06-06 | Wabco Gmbh | Serielles Bussystem |
| DE19611944C2 (de) * | 1996-03-26 | 2003-03-27 | Daimler Chrysler Ag | Integrierter Schaltkreis zur Kopplung eines mikrokontrollierten Steuergerätes an einen Zweidraht-Bus |
-
1999
- 1999-12-16 DE DE1999160800 patent/DE19960800A1/de not_active Withdrawn
-
2000
- 2000-12-14 WO PCT/DE2000/004462 patent/WO2001044012A2/de not_active Ceased
- 2000-12-14 EP EP00990534A patent/EP1238495A2/de not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0144012A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2001044012A3 (de) | 2002-02-14 |
| WO2001044012A2 (de) | 2001-06-21 |
| DE19960800A1 (de) | 2001-07-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 20020416 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: KUCERA, MARKUS Inventor name: GOSS, STEFAN Inventor name: NOSSAL, ROMAN |
|
| RBV | Designated contracting states (corrected) |
Designated state(s): DE FR IT |
|
| 17Q | First examination report despatched |
Effective date: 20040512 |
|
| 17Q | First examination report despatched |
Effective date: 20040512 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Effective date: 20070130 |