EP2438712A1 - Procédé de fonctionnement d'un système de transmission de données, système de transmission de données et progiciel d'ordinateur - Google Patents

Procédé de fonctionnement d'un système de transmission de données, système de transmission de données et progiciel d'ordinateur

Info

Publication number
EP2438712A1
EP2438712A1 EP10718530A EP10718530A EP2438712A1 EP 2438712 A1 EP2438712 A1 EP 2438712A1 EP 10718530 A EP10718530 A EP 10718530A EP 10718530 A EP10718530 A EP 10718530A EP 2438712 A1 EP2438712 A1 EP 2438712A1
Authority
EP
European Patent Office
Prior art keywords
data
transmission
determined
time information
time
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Withdrawn
Application number
EP10718530A
Other languages
German (de)
English (en)
Inventor
Matthias Cwik
Markus Roessle
Ewald Mauritz
Juergen Gross
Stefan Tumback
Falco Sengebusch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2438712A1 publication Critical patent/EP2438712A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658—Clock or time synchronisation among packet nodes
    • H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0664—Clock or time synchronisation among packet nodes using timestamps unidirectional timestamps
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • 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
    • H04L12/407—Bus networks with decentralised control
    • H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
    • H04L12/4135—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD] using bit-wise arbitration
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0852—Delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
    • H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
    • 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
    • H04L2012/40208—Bus networks characterized by the use of a particular bus standard
    • H04L2012/40215—Controller Area Network CAN

Definitions

  • the invention relates to a method for operating a data transmission system with data in a data packet that is sent between a transmitting device and a receiving device.
  • the invention further relates to a data transmission system having a transmitting device for transmitting information and a receiving device for receiving data packets, the transmitting device having a transmitter clock and the receiving device having a receiver clock.
  • the invention also relates to a computer program product loadable into a program memory with program instructions from a microcomputer.
  • Control devices in a motor vehicle In the case of a CAN bus, the data sent in a regular cycle is available as information, such as measurement signals or internal variables of the control devices, to all the control devices attached to the bus.
  • the temporal assignment of measurement signals is important. On the one hand, this can be important in order to predetermine the correct time of an event from previous measured values in the form of a prediction. On the other hand, fluctuations or individual deviations in the transit time are important, for example if a rotational speed analysis of an electrical machine in the form of a frequency analysis of the data is to be carried out.
  • the method according to the invention can thus be applied particularly advantageously if data acquisition and data evaluation are distributed over at least two devices connected via the data link and the exact time of the data acquisition is of importance.
  • the data transmission system comprises at least one transmitting and one receiving device, each of which determines corresponding time information by means of a transmitter or a receiver clock.
  • these are independent, especially independent of each other, watches.
  • Such clocks can be realized in a technically simple manner, for example as electronic components or assemblies in each case in the transmission or in the receiving device.
  • to determine the age of data at least the duration of the transmission, referred to below as the runtime, of the data packet with the data is determined by means of the transmitting and receiving device, namely by transmitting the transmission time information in addition to the data packet Transmission is added and then a reception time information is determined upon receipt of the data packet.
  • this time information marks the time beginning and the end of the transmission, ie the running time, in particular with respect to two, preferably autonomous, time axes predetermined by the two clocks, so that according to the invention the delay is obtained from the deviation between these two time information.
  • the runtime can therefore be longer than the pure retention time of the data on the data link.
  • the age of the data may correspond to the term, for example, if the data is sent immediately after being acquired or generated, or the term may be only a fraction of the age.
  • the computer program product performs a previously and / or subsequently described method on a microcomputer of the data transmission system, wherein the computer program product can be loaded into a program memory with program instructions from the microcomputer.
  • the transmitting device and the receiving device may each comprise a microcomputer, wherein the computer program product may have two partial products, namely for each of the microcomputer of the transmitting and the receiving device.
  • the transmission time information is added to the data packet already before transmission, since transmission, in particular in the case of a serial data transmission, requires a certain amount of time, for example in order to feed the data packet data to the data path.
  • the data packet to be sent is already completely assembled at the time the transmission starts, ie in particular the transmission time information and the data to be transmitted are added to the data packet.
  • a possibly unknown delay can occur between the insertion of the transmission time information or also the time which the transmission time information reflects and the transmission start, for example because - A -
  • the ne preferred transmitting device builds the data packet using a sequential microcomputer.
  • the transmission time information can thus represent a time information which differs from the transmission start or also from the insertion time of the transmission time information into the data packet.
  • further delays may occur, for example, due to calculations or other work steps of the transmitting device. Such delays add to the age of the data and may be part of the term in the meaning of the invention.
  • the reception time information is determined on the basis of the receiver clock when receiving a data packet.
  • the previous description regarding the delays in the transmission process applies analogously.
  • the reception time information can also characterize a time, preferably suitably selected, during the data transmission. For example, a point in time which reflects the start or the completion of a reception process or else a first or processing step of the data packet in the reception device, preferably as early as possible, is determined as reception time information.
  • the invention makes it possible to determine the transit time in particular by means of the airtime information according to the invention in a data packet and thus to gain the age, but at least an important factor in the determination of the age of the data.
  • the running time can therefore not correspond directly to the deviation between the time information, for example, because of the autonomy of the clocks and the resulting retardation.
  • the path difference between the respective transmitter clock and the receiver clock is determined in a first step, so that in a subsequent step, the sought transit time of a received data packet is calculated from the deviation between transmission and reception time information by the deviation is corrected by the previously determined retardation.
  • the path difference between the transmitter clock and the receiver clock can be selected from a plurality of transmission signals.
  • N data packets are determined with data.
  • the material and / or assembly costs for access to a central clock or a device can be omitted specifically for synchronization or determination of the path difference of the clocks.
  • the transit times of the data packets over the data link may have a frequency distribution, for example due to the above-explained delays in transmission and reception.
  • at least two data packets may have different transit times during the transmission along the data link.
  • having a frequency distribution means that the term is a quantity whose concrete value can not be predicted and / or predetermined for a particular data packet, and "frequency distribution” is a measure of the probability that a data packet has a certain duration to understand.
  • a specific data path preferably has a characteristic, known frequency distribution, which may also be due to a random process.
  • the form of the frequency distribution can in particular also be determined by the technical realization of the data link, the number and transmission frequency of further transmitting devices, the priority of the data packets or the data stream on the data link and, for example, have a Gaussian curve shape.
  • the path difference can be determined by determining a second frequency distribution from the respective deviations between transmission and reception time information for a plurality of received data packets and from the first, namely the frequency distribution of the transit time, and the second, namely the frequency distribution of the deviation, the path difference is determined.
  • the second frequency distribution contains information about the first frequency distribution, namely the deviations between transmission and reception time information both through the runtime of a Data packets as well as by the path difference between transmitter clock and receiver clock determines.
  • the transmitting and receiving device can be synchronized by means of the plurality of received data packets, preferably even before a time-critical state, ie when the temporal assignment of the data is not relevant or of lesser importance.
  • a time-critical state ie when the temporal assignment of the data is not relevant or of lesser importance.
  • a preferred embodiment of this embodiment provides, in each case for a data packet, to define the deviation between transmission and reception time information as the sum of the path difference and the transit time or to model it.
  • this sum can be supplemented by further time components, for example a delay between the data acquisition and the time corresponding to the transmission time information, depending on which times are reproduced by the transmission and reception time information, as described above and below.
  • the difference in gait can be determined by choosing to cover the two aforementioned frequency distributions.
  • the second frequency distribution can be shifted by varying the transition difference value along the time axis and so on the sought path difference can be determined by comparing the two frequency distributions.
  • the term "bring to coincidence" here stands for a variety of methods to compare the two frequency distribution.
  • the path difference can be determined as the difference of the average values, medians, maxima or other positional parameters or also corresponding edges or bases of the frequency distributions.
  • the frequency distributions which are based on a limited number of examined data packets, can be compared by dividing the discrete distributions by means of a variation of the para- Meters path difference are approximated numerically and so the sought path difference is determined.
  • the transit time can be determined from a difference between received and transmitted time information by the difference around the
  • the clocks can be designed such that they measure or deliver relative time information, that is to say not an absolute time, and can be manufactured more favorably compared to clocks which measure the absolute time of day.
  • the transmitter clock and / or the receiver clock each have a counter which cyclically passes through a respective counting range and can be selected as transmitting or receiving time information of the respective counter reading.
  • the counters can at one time different time information, d. H. Counter readings, so the mentioned
  • the counters preferably work with counter frequencies that are as similar as possible in order to be able to minimize a drift in the path difference and thus to be able to reduce an error in age determination.
  • such a counter can cyclically during its operation at a first count, for example, with the commissioning of the transmitting or the receiving device, begin counting to continue counting with the counter frequency, up to a maximum or minimum count, whereupon a so-called counter overflow take place and the counter can continue counting at a minimum or maximum count.
  • the counter may be reset during operation.
  • the counters of the transmitter and the receiver clock can count independently of each other and can in particular be different Counting ranges, including different minimum and maximum counts, have.
  • the cycle duration of the counter is longer than a maximum duration of the data packets. Then, when determining the duration of the mentioned
  • Counter overflows are considered and in particular a counter overflow can be detected and the age determination is corrected at a determined as described above: If the determined running time falls below a predetermined minimum value or it is even negative, the counter or the receiver clock has overflowed, so when determining the Running time of the determined path difference between the clocks can be increased by the maximum count of the receiver clock. If the determined transit time exceeds a predetermined maximum value, the counter or the transmitter clock has overflowed, so that when determining the transit time the ascertained path difference between the clocks can be reduced by the maximum count of the transmitter clock. If both corrections do not lead to a plausible result, both counters or clocks can have overflowed and both corrections can be carried out.
  • the total correction can thus be carried out in two steps, wherein in one step the runtime is increased by the maximum value of the counter of the receiver clock, if the runtime falls below a predetermined minimum value, and in a step independent of the runtime by the maximum value of Counter of the transmitter clock is reduced, if the transit time exceeds a predetermined maximum value.
  • the age of the data may also be conditioned by further delays in the transmission device, for example by a calculation period after detection of a measurement signal.
  • the data packet can then be supplemented with acquisition time information about an acquisition time of the data and / or also calculation time information on the duration between the acquisition and the calculation of the data or between the acquisition and the associated time of the airtime information.
  • acquisition time information about an acquisition time of the data
  • calculation time information on the duration between the acquisition and the calculation of the data or between the acquisition and the associated time of the airtime information.
  • the age determination of the data can be further improved, in particular if processing steps of the data already take place in the transmitting device.
  • the data can also be extrapolated from a time of its detection at a time of calculation of the data packet or also at the time of the transmission time information.
  • the data link is operated in a regular clock.
  • a clocked data link it is possible, for example, to determine transit times as a multiple of the clock by counting, and an accurate time measurement can be dispensed with.
  • at most one data packet is sent per clock and the transmission of the data packet after the storage of the airtime information can be delayed until a free clock is available.
  • the effort to determine the duration of a specific data packet can be reduced, since this time is separated by the predetermined clock of other data packets.
  • the data link is preferably realized as a CAN bus and / or the transmitting and receiving device in each case as a connected to the CAN bus controller.
  • the messaging on the CAN bus is not time-synchronized, so that conventionally no statements about the duration of a single data packet are possible and the inventive method is particularly advantageous in this frequently used bus to improve the age determination of the data.
  • control devices can thus be synchronized with the method according to the invention. and can then be properly assigned the transmission time information in the data packet upon receipt of the data packet with respect to the reception time information and thus the determination of the age of the data can be improved.
  • the data transmission system comprises two control devices connected by a CAN bus for controlling a starting device of an internal combustion engine in a motor vehicle. Then, according to the method described above, time-critical information about the. Can be provided by a first control device as the transmitting device
  • Rotational speed of the starting device and / or the internal combustion engine are detected, and this data can be transmitted to a second control device as a receiving device or as a control of a starting process of the internal combustion engine according to the inventive method, for example, the start device optimally secure- trace in the internal combustion engine.
  • FIG. 1 is a schematic representation of a data transmission system according to the invention with two control devices and a CAN bus,
  • Fig. 2 is a schematic overview of some components of the age of the data in the data transmission
  • 4 shows frequency distributions of transit times on the CAN bus
  • 5 shows a schematic representation of a method according to the invention for determining the age of data
  • Fig. 8 shows schematically an extrapolation of the data in another embodiment.
  • FIG. 1 shows a schematic representation of a data transmission system according to the invention with two control devices 25, 26, namely a transmitting device 25 for transmitting and a receiving device 26 for receiving data packets via a CAN bus 29 as a data link, shows.
  • the transmitting device 25 and the receiving device 26 each have a microcomputer, not shown, with a program memory with program instructions in order to execute at least the steps explained below by means of a correspondingly designed and loaded into the program memory computer program product.
  • the transmitting device 25 has a transmitter clock 27, from which a transmission time information 6 obtained and inserted into the data packet
  • the receiving device 26 has a receiver clock 28, on the basis of receiving a data packet receive time information 7 is determined.
  • the transmitter 27 and receiver clock 28 each have a counter which cycles through a respective counting range, wherein the count of the transmitter clock 27 is written at time t3 as a transmission time information 6 in the data packet and the count of the receiver clock 28 at time t6 determined as the reception time information 7 becomes.
  • Both clocks 27, 28 start with the startup of the respective control device 25, 26 with a count zero and then count up to a respective maximum count t s, max> t e, max of the transmitter 27 and receiver clock 28, which are different from each other , After reaching the respective maximum counter readings t s, max> t e, max , as shown in FIG. 6, one counter overflow each time and the counting process starts again at the zero count.
  • FIG. 2 shows a schematic overview of some possibilities for a delay or components of the age of the data in the data transmission, wherein working cycles 1 of the transmitting device 25 are plotted along a time axis t above work cycles 2 of the receiving device 26.
  • Working cycles 1 of the transmitting device 25 are plotted along a time axis t above work cycles 2 of the receiving device 26.
  • the work cycles 1, 2 are explained in more detail in FIG.
  • a rotational speed of an internal combustion engine is detected, which is determined by a sensor, not shown, based on a pulse signal 3, wherein the pulse signal 3 is determined by the teeth of a rotating gear.
  • a first delay T1 Since the speed can only be determined due to two pulse signals 3 and therefore it corresponds to a mean speed at a time t1 between these pulse signals. Due to the power strokes 1 of the transmitting device 25 results in a certain sampling frequency, so that the speed is detected as a measurement signal 5 with a delay T2 from the transmitting device 25 at time t2. Furthermore, a delay T3 occurs during a processing cycle 10 between the detection of the measurement signal 5 and a transmit clock 11 and a delay T4 which corresponds to the duration of a transmission clock 12 of the data along the CAN bus 29. Finally, a delay T5 occurs between the reading of the data packet in the receiving device 26 and a calculation using the received data.
  • FIG. 3 shows schematically along the time axis t the data transmission with the data transmission system according to the invention, only one part of a cycle of the cyclically executed working cycles 1 of the transmitting device 25 and working cycles 2 of the receiving device 26 being shown here.
  • an event namely the measuring signal 5, which is detected by the transmitting device 25 and processed in a processing cycle 10, occurs at the time t2.
  • a transmission time information 6 is determined and the transmission clock 1 1 starts, in which the transmission time information 6 is added to the data packet and the transmission device 25 waits for a free clock of the CAN bus 29.
  • the duration between the time t4 and t3 is largely determined by the utilization of the bus 29 and by collisions with other data packets of higher priority.
  • the data packet is transmitted serially via the CAN bus 29, wherein the data transmission takes place until the time t5.
  • the receiving device 26 receives the data packet and determines the reception time information 7 until the end of a processing cycle 14.
  • the term 15 according to the invention is the duration between the times t3 and t6 corresponding to the transmission time information 6 and the reception time information 7, the time 15 thus being a total delay due to the transmission clock 1 1, the transmission clock 12 and the processing clock 14.
  • FIG. 4 shows frequency distributions 20, 20 'of the transit times 15 on the CAN bus 29, wherein the probability W is plotted that a data packet requires a certain transit time 15 of the time t.
  • the probability W is plotted that a data packet requires a certain transit time 15 of the time t.
  • delays occur and the runtime 15 of a data packet can not be predetermined. So it's a random quantity.
  • FIG. 4 shows, by way of example only, two possible frequency distributions 20, 20 ', since the distribution form depends on the respective operating state of the CAN system.
  • Buses 29, in particular also the number, the transmission frequency and the priority of further transmission devices or data packets depends, the thereby determined, characteristic frequency distributions 20, 20 'in particular a minimum and maximum transit time t
  • a Gaussian curve shape as shown in FIG. 4 b), can also occur as frequency distributions 20 '.
  • a step 30 a plurality of data packets are transmitted between the control units 25, 26 via the CAN bus 29, wherein as explained above at least the transmission time information 6 is transmitted and the reception time information 7 is determined.
  • the transmission time information 6 and the reception time information 7 of the data packets are respectively compared and their deviations are used to determine a second frequency distribution 21, which will be explained in more detail later.
  • the second frequency distribution 21 is compared with the first frequency distribution, namely the frequency distribution. ment 20, 20 'of FIG. 4, compared and determined by the comparison of a path difference 22 between transmitter 27 and receiver clock 28. The comparison and the determination of the path difference 22 will also be explained below.
  • the transit time 15 of a data packet is determined from the deviation between the transmission time 6 and the reception time information 7 by correcting this deviation by the previously determined retardation 22.
  • FIG. 6 shows the comparison of the first frequency distribution 20 of the propagation times 15 on the CAN bus 29 and the second frequency distribution 21 of the deviations between the transmission 6 and the reception time information 7 of the respective transmitted data packets.
  • the deviations between the transmission 6 and the reception time information 7 are determined by the path difference 22 between the transmitter clock 27 and the receiver clock 28 in addition to the transit time 15 of the associated data packet. Therefore, the comparison of the two frequency distributions 20, 21 shows a shift on the time axis t, which just corresponds to the path difference 22. In order to determine the path difference 22 according to step 32 in FIG. 5, it is therefore sufficient to compare the frequency distributions 20, 21. So in this
  • the value of the path difference 22 is determined in principle by being suitably chosen so that the frequency distribution 21 is brought to the left in coincidence with the frequency distribution 20 at a shift along the time axis t by the selected value, and concretely determined by the receiving device 26, the difference of the maxima 23, 24 of the frequency distributions 20, 21 is calculated.
  • the retardation can be determined directly by the comparison of the frequency distributions 20, 21, and subsequently, the respective transmission time information 6 can be properly assigned with respect to the reception time information 7.
  • Fig. 7 shows schematically the course 60 of the count of the transmitter clock 27 and the course 61 of the count of the receiver clock 28 along the time axis t. Furthermore, the transit time 15 of a data packet, the count t s of the transmitter clock 27 at the time t3 of the transmission time information 6, the count t e of the receiver clock 28 at the time t6 of the reception time information 7 and the Gap difference 22 between the transmitter clock 27 and the receiver clock 28 during runtime 15 shown.
  • the term 15 of the data packet from the difference of the count t e of the receiver clock 28 and the count t s of the transmitter clock 27 is calculated by additionally the path difference 22 is added.
  • the duration between two overflows 63, 64 of each counter is significantly greater than the maximum transit time t
  • the receiving device 26 detects such an overflow 63, 64 based on an implausible value of the calculated transit time 15. Then, in a first step, the transit time 15 by the maximum value t e , m a x of the counter Receiver clock 28 increases if the time 15 falls below a predetermined minimum value, which is smaller than the smallest
  • is.
  • the possibly already corrected transit time 15 is reduced by the maximum value t s max of the counter of the transmitter clock 27 if the transit time 15 exceeds a predetermined maximum value which is greater than the maximum transit time t
  • a second exemplary embodiment has been supplemented by a further method step compared to that described above in order to further improve the determination of the age of the data. Accordingly, the preceding description of the first exemplary embodiment applies without restriction to the second exemplary embodiment.
  • a delay occurs between the time t 2 of the detection of the measuring signal 5 and the time t 3 of the transmitting time information 6 in the transmitting device 25. Therefore, the data acquired at the detection time t2 is extrapolated at the time t3 of the transmission time information 6 by a linear extrapolation 72 each over the last two received measurement signals.
  • FIG. 8 schematically shows the extrapolation 72 with which a quasi-more current measurement signal 70 is calculated, which is to be expected according to the previously known curve 71 of the associated measured variable at time t3 of the airtime information 6.
  • the values for the extrapolation 72 are derived, for example, from a function or slope calculation of the profile 71 and / or previous measured values. passes. This method step thus makes an exact determination of the age of the data possible, since they correspond exactly to the known time t3. It should be noted, however, that then the data is subject to an error due to the extrapolation 72.
  • the time point to which an extrapolation is made is selected as early as possible after the acquisition time t2 in order to obtain the
  • the extrapolation 72 also takes place at a point in time within the step of the data processing 11, provided that the measurement signal 5 is already in the FIG
  • Transmission device 25 is used for a calculation.
  • an acquisition time information about the time t2 of the data acquisition 5 is additionally included in the data packet.
  • the age of the data determined by the measurement signal 5 corresponds to the difference of the times t6 and t1.
  • the receiving device 26 can completely determine the age of the data up to the duration between the times t1 and t2, ie an error which is caused by the sampling rate of the transmitting device 25.
  • the time from the detection time t2 to a calculation of the data in the processing clock 10 is determined and stored as detection time information in the data packet.
  • the time of the calculation is as late as possible in the processing cycle 10 and the transmission start as early as possible in the transmission clock 1 1 in order to minimize the unknown delay between these two times.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

L'invention concerne un procédé de fonctionnement d'un système de transmission de données, les données étant placées dans un paquet qui est envoyé entre un dispositif d'émission (25) et un dispositif de réception (26). Afin de déterminer plus précisément l'instant de la collecte à partir d'informations, des informations d'instant d'émission (6) fournies par une horloge d'émission (27) sont ajoutées au paquet de données avant l'émission, des informations d'instant de réception (7) sont déterminées par une horloge de réception (28) lors de la réception du paquet de données, et la durée de transit (15) du paquet de données reçu est calculée à partir de l'écart entre les informations d'instant d'émission (6) et les informations d'instant de réception (7).
EP10718530A 2009-06-02 2010-04-20 Procédé de fonctionnement d'un système de transmission de données, système de transmission de données et progiciel d'ordinateur Withdrawn EP2438712A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910026641 DE102009026641A1 (de) 2009-06-02 2009-06-02 Verfahren zum Betreiben eines Datenübertragungssystems, Datenübertragungssystem und Computerprogrammprodukt
PCT/EP2010/055157 WO2010139504A1 (fr) 2009-06-02 2010-04-20 Procédé de fonctionnement d'un système de transmission de données, système de transmission de données et progiciel d'ordinateur

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EP2438712A1 true EP2438712A1 (fr) 2012-04-11

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EP10718530A Withdrawn EP2438712A1 (fr) 2009-06-02 2010-04-20 Procédé de fonctionnement d'un système de transmission de données, système de transmission de données et progiciel d'ordinateur

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EP (1) EP2438712A1 (fr)
DE (1) DE102009026641A1 (fr)
WO (1) WO2010139504A1 (fr)

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US8775681B2 (en) 2011-04-27 2014-07-08 GM Global Technology Operations LLC Cross-network synchronization of application S/W execution using flexray global time
DE102012204586A1 (de) * 2012-03-22 2013-10-17 Bayerische Motoren Werke Aktiengesellschaft Gateway, Knoten und Verfahren für ein Fahrzeug
DE102018214900A1 (de) * 2018-09-03 2020-03-05 Volkswagen Aktiengesellschaft Steer-by-Wire-Lenksystem für ein Fahrzeug und Verfahren zum Betreiben eines Steer-by-Wire-Lenksystems für ein Fahrzeug
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