EP1676390A1 - Procede et dispositif de transmission de donnees unifilaire bidirectionnelle - Google Patents

Procede et dispositif de transmission de donnees unifilaire bidirectionnelle

Info

Publication number
EP1676390A1
EP1676390A1 EP04738834A EP04738834A EP1676390A1 EP 1676390 A1 EP1676390 A1 EP 1676390A1 EP 04738834 A EP04738834 A EP 04738834A EP 04738834 A EP04738834 A EP 04738834A EP 1676390 A1 EP1676390 A1 EP 1676390A1
Authority
EP
European Patent Office
Prior art keywords
peripheral device
control unit
electronic control
coded
information
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Withdrawn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
EP04738834A
Other languages
German (de)
English (en)
Inventor
Rolf Kraemer
Ulrich Bentel
Bernhard Eisele
Markus Ketterer
Uwe Schiller
Juergen Stein
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 EP1676390A1 publication Critical patent/EP1676390A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/4902—Pulse width modulation; Pulse position modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1423—Two-way operation using the same type of signal, i.e. duplex for simultaneous baseband signals

Definitions

  • the present invention relates to a method and a device for bidirectional single-wire data transmission of data information between an electronic control unit and at least one peripheral device, the electronics of which are supplied from the control signal.
  • peripheral devices are connected to a control unit via lines.
  • the corresponding peripheral devices are usually spatially separated from the control unit, which places special demands on the lines and interfaces.
  • bus systems for motor vehicle applications are already known, such as the CAN bus system.
  • these bus systems are not for real-time systems, i.e. suitable for an immediate triggering of a process when information is received after a few ⁇ s, but only for non-time-critical data exchange in spatially distributed systems.
  • the idea on which the following invention is based is that by applying a predetermined constant voltage (or a predetermined constant current) to the output of a driver device of the electronic control unit, voltage-coded (or current-coded) information is generated, this voltage-coded (or current-coded) information is transmitted from the driver device of the control unit to a driver device of the peripheral device via a single-wire circuit, the peripheral device being controlled by the control signal and being supplied with energy during the control, and after the start of the control of the peripheral device, current-encoding information is obtained thereon (or voltage-coded), the current-coded (or voltage-coded) information from the driver device of the peripheral device to the driver device of the electronic control unit during the control of the periphery device is retransmitted, using the same single-wire line as for transmitting the voltage-coded (or current-coded) control information.
  • a bidirectional single-wire interface is thus created, in which the supply of the peripheral device is accomplished by the information-transmitting control signal with the portion of energy that is at least for the low-power portion of the electronics, namely the driver device and the information processing electronics of the peripheral device including the communication logic or the control signals of the power electronics is required.
  • the device and the method according to the invention provide an interface with which information about the electronic control device is activated during the control of the peripheral device. device can be retransmitted. Due to the energy supply of the peripheral device by the control signal, an extremely interference-proof system against accidental switching on is created.
  • the voltage-coded (or current-coded) control of the peripheral device is designed as a binary signal and the current-coded (or voltage-coded) retransmission as an analog signal.
  • both the voltage-coded (or current-coded) control and the current-coded (or voltage-coded) retransmission are designed as a binary signal.
  • the information to be transmitted back from the peripheral device to the electronic control unit is designed as a diagnostic signal for diagnosing the peripheral device.
  • the control unit can thus carry out an analysis of the state of the peripheral device using the retransmitted information.
  • the information to be transmitted back from the peripheral device to the electronic control unit is used as a control signal for the further i.e. subsequent control of the peripheral device.
  • the electronic control unit can thus carry out a control of the associated peripheral device that is adapted to the respective state of the system.
  • the information to be transmitted is voltage or current coded in such a way that the time period until an edge change in the voltage or the current represents the characteristic quantity of the information.
  • the electronic control unit is designed as an engine control unit.
  • Other training courses are also conceivable.
  • the peripheral device is designed as an ignition coil, injection valve of a motor vehicle engine or the like.
  • FIG. 1 shows a schematic representation of a device 1 according to the invention, consisting of an electronic control unit 2 and a peripheral device 3 connected to the same via a single-wire line 4;
  • Figure 2 is a schematic representation of the circuit structure of the driver devices 20 and 30 of the electronic control unit 2 and the peripheral device 3 according to an embodiment of the present invention
  • FIG. 3a shows a schematic representation of a timing diagram during data transmission according to a first exemplary embodiment of the present invention, the time range of a change of state being detected;
  • FIG. 3b shows a schematic representation of a timing diagram during data transmission according to a second exemplary embodiment of the present invention, with a bit being assigned to each time range;
  • FIG. 3 c shows a schematic representation of a timing diagram during data transmission according to a third exemplary embodiment of the present invention using the example of primary current monitoring.
  • FIG. 1 shows a schematic illustration of a device 1 for bidirectional data transmission of data information via a single-wire line 4 between an electronic control unit 2 and a peripheral device 3, for example with an ignition coil 7 or an injection valve of a motor vehicle engine, a sensor or the like.
  • the device relating to an ignition system 5 of a motor vehicle engine will be explained by way of example below with reference to FIG. 1.
  • the ignition system 5 consists of, for example an ignition coil 7, power electronics 32 for ignition control with, for example, logic and a required ignition output stage, an information processing device 31, a driver device 30, which is connected via the single-wire line 4 to an ignition driver 20 in an engine control unit 2 with a microcontroller 21.
  • Information for switching on the peripheral device 3 or the ignition coil 7 is transmitted from the electronic control unit or the engine control unit 2.
  • the power electronics 32 of the peripheral device 3 can preferably be connected to an external battery voltage 33 via the ignition coil 7, the circuit being closed via a body mass 34.
  • the electronics of the peripheral device 3 are supplied with energy from the control by the control unit 2, the electronics of the peripheral device 3 also controlling the power electronics 32 with this energy.
  • the power electronics 32 can also be decoupled from the information processing device 31 and controlled directly by the single-wire interface 4.
  • the power electronics 32 of the peripheral device 3 being switched off on the basis of a control current flow that is no longer present or a control voltage that is no longer present.
  • the power transistor interrupts the current flow in the primary side, with a current flow in the secondary side of the ignition coil due to the induction and consequently an ignition spark.
  • the driver device 20 of the electronic control unit 2 is connected to a microcontroller 21 (see FIG. 1). Furthermore, the driver device 20 of the illustrated embodiment of the device of the electronic control unit 2 has, for example, an operational amplifier 23, which is connected as a voltage follower such that the voltage node VI always has the same voltage as the voltage node V0, the voltage follower preferably having other electronic ones Circuits are combined in a separate circuit.
  • a threshold value comparator 24 with an associated logic device for sensing a change in the driver device 30 of the peripheral device 3, as will be described in more detail later, is provided in the driver device 20.
  • the driver device 20 of the electronic control unit 2 is connected via the single line 4 to the driver device 30 of the peripheral device 3 for unidirectional conduction of a current flow and bidirectional transmission of information.
  • the driver device 30 likewise comprises a threshold value comparator in the logic 36. Furthermore, the driver device 30 comprises a current sink arrangement which, according to the present exemplary embodiment, consists, for example, of a first current sink I] and a second current sink I 2 connected in parallel thereto. A binary current coding of the information to be retransmitted is carried out from the peripheral device 3 to the electronic control unit 2 via the current sinks I] and I 2 .
  • a computer program of the microcontroller 21 triggers an information transfer from the electronic control unit 2 to the peripheral device 3.
  • the information to be transmitted is preferably transmitted to the driver device 20 of the electronic control unit 2 via a port of the microcontroller 21 in the form of a voltage change or level change.
  • the driver device 20 provides an essentially constant one at its output VI
  • the operational amplifier 23 of the electronic control unit 2 in the driver device 20 is preferably connected as a voltage follower such that the same constant voltage is always present at the voltage node VI as at the voltage node V0, as already explained above. Parts or multiples of a fixed voltage can also serve as a reference. In this case, minor voltage fluctuations can be neglected. Alternatively, a low-resistance connection can be made via R0 to a constant voltage source.
  • the peripheral device 3 detects this voltage by means of the threshold value comparator 36 or by activating an input stage as a function of a response threshold.
  • the current flow generated by the application of the constant voltage flows via the single-wire line 4 from the electronic control unit 2 to the peripheral device 3, the electronics of the peripheral Rieauss 3 is powered and thus can work. Without the constant voltage being applied, there is no current flow in the system, as a result of which the electronics of the peripheral device 3 are in an off state. It is only through the activation that energy is simultaneously made available for starting operation. This makes the system independent of a battery voltage, which means that the system can be used universally with different electrical system voltages. In addition, the security against unwanted switching on is increased.
  • the control circuit is closed via a body ground 34, which is connected to the arrangement consisting of the current sinks Ij and I 2 .
  • the information that arises due to the activation of the peripheral device 3 is preferably binary or analog current-coded via a corresponding circuit of the current sinks Ii and I 2 in the driver device 30 of the peripheral device 3 and transmitted back to the control unit 2 via the same single-wire line 4.
  • the logic device of the peripheral device 3 changes its current consumption in a binary or analog manner, which is described in more detail below with reference to FIG. 3.
  • the ratio of the current sinks L and I 2 of the driver device 30 of the peripheral device 3 depends on the required sensitivity to interference and on the circuitry possibilities of the driver device 20 of the electronic control unit 2.
  • the current sink I 2 is preferably connected in parallel to the current sink Ij, with the logic 36 sensing whether, for example, a value characteristic of a certain event has been reached in the power electronics.
  • the circuit shown in FIG. 2 is of course only a schematic representation for the evaluation and processing of an event in the electronics. It is obvious to a person skilled in the art that other system changes for evaluating and processing a current change on the single-wire interface are conceivable.
  • the information to be transmitted from the peripheral device 3 to the electronic control unit 2 is binary-coded and from the driver device 30 of the peripheral device 3 via the single-wire line 4 the driver device 20 of the electronic control unit 2.
  • the interface current can be measured in the driver device 20 with the aid of a resistor Ro.
  • the voltage change that occurs can be assigned to a binary state, ie 0 or 1, via the threshold value comparator 24 of the electronic control unit 2.
  • the driver device 20 then forwards the received information, preferably via a further line, to the microcontroller 21 of the electronic control unit 2.
  • the extensive independence of voltage and current is advantageously used in order to be able to transmit the information accumulating in the peripheral device 3 back to the electronic control unit 2.
  • the electronic control unit 2 can interpret the retransmitted information in various ways depending on the respective area of application, it being possible to adapt the software to the corresponding interpretation. However, this has no influence on the interface arrangement according to the invention.
  • the protocol for the information transmission can be formed freely, for example, as shown in FIG. 3 a with the aid of a timing diagram according to an exemplary embodiment of the present invention, only the time of occurrence of a change of state can be detected.
  • 3 a shows the time in the x direction and the height or the value of the signal edge in the y direction.
  • the signal can be interpreted freely, and both the quantization and the range of values can be adapted to the corresponding area of application.
  • the coding of the binary states can be defined by a rising or falling signal edge, which e.g. must be detected in a certain time window (time to time 4).
  • the decisive factor here is the point in time at which the change in state occurs, for example from state 0 to state 1 or vice versa, the vertical solid lines defining the time window.
  • FIG. 3b schematically shows three examples of a timing diagram according to a further exemplary embodiment of the present invention.
  • the data are transmitted as bits assigned to the time window, the number of bits not being fixed, but rather being able to be adapted to the corresponding requirements.
  • the time of occurrence of the change of state from 0 to 1 or vice versa is preferably selected as coding within a certain time window.
  • FIG. 3 c schematically shows a timing diagram according to a further exemplary embodiment of the present invention for the example of an ignition coil in the peripheral device.
  • the rise in the primary current I pr j m of the ignition coil is monitored by reporting the time tc F until a predetermined value I CF is exceeded. This can be done, for example, in the case of voltage control by lowering the current I tg of the single-wire line when the event occurs.
  • the signals shown in Figures 3 a to 3 c are not shown in the physical form, but only as an example for the logical relationships.
  • a method and a device are thus created with which an event is transmitted from a peripheral device to the control unit via the single-wire line which ensures the control of the peripheral device by manipulating the control current in such a way via switchable current sources or sinks that the control unit is a change in the system, ie the event, can detect and evaluate.
  • the information retransmitted to the control unit can be processed for diagnosis or for control purposes.
  • the device according to the invention or the method according to the invention can also be carried out by a current-coded control and a voltage-coded feedback, i.e. in the opposite way to the exemplary embodiments explained in detail above.
  • the control is implemented with a fixed current at the output of the driver device 20 of the electronic control unit 2, the peripheral device 3 consequently responding with a variable voltage.
  • the electronics of the peripheral device 3 only work when they are supplied with energy by the control.
  • the driver device 20 of the electronic control unit 2 is designed here as an ideal current source instead of an ideal voltage source.
  • the voltage source arrangement of the driver device 30 of the peripheral device 3 is designed in such a way that, in the event of a voltage feedback, the total resistance is changed in such a way that the respective applied voltage varies at a constant current, i.e. a voltage-coded information is retransmitted.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Selective Calling Equipment (AREA)
  • Dc Digital Transmission (AREA)
  • Bidirectional Digital Transmission (AREA)

Abstract

La présente invention concerne un dispositif et un procédé de transmission de données unifilaire bidirectionnelle d'informations de données entre une unité de commande électronique (2) et au moins un appareil périphérique (3). Ce procédé consiste à appliquer une tension constante prédéfinie ou un courant constant prédéfini à un dispositif pilote (20) de l'unité de commande électronique (2), afin de produire des informations codées en tension ou codées en courant, à transmettre les informations codées en tension ou codées en courant du dispositif pilote (20) de l'unité de commande électronique (2) jusqu'à un dispositif pilote (30) de l'appareil périphérique (3) via une ligne unifilaire (4), à commander et à alimenter au moins la logique de pilote du dispositif pilote (30) et/ou la logique de communication de l'appareil périphérique (3) au moyen du flux de courant, à coder en courant ou en tension des informations résultant de l'activation de l'appareil périphérique (3) concernant celui-ci, à retourner les informations codées en courant ou codées en tension du dispositif pilote (30) de l'appareil périphérique (3) jusqu'au dispositif pilote (20) de l'unité de commande électronique (2) lors de l'activation de l'appareil périphérique (3) sur la même ligne unifilaire (4).
EP04738834A 2003-08-06 2004-07-01 Procede et dispositif de transmission de donnees unifilaire bidirectionnelle Withdrawn EP1676390A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10335905.2A DE10335905B4 (de) 2003-08-06 2003-08-06 Verfahren und Vorrichtung zur bidirektionalen Eindraht-Datenübertragung
PCT/DE2004/001388 WO2005015816A1 (fr) 2003-08-06 2004-07-01 Procede et dispositif de transmission de donnees unifilaire bidirectionnelle

Publications (1)

Publication Number Publication Date
EP1676390A1 true EP1676390A1 (fr) 2006-07-05

Family

ID=34089086

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04738834A Withdrawn EP1676390A1 (fr) 2003-08-06 2004-07-01 Procede et dispositif de transmission de donnees unifilaire bidirectionnelle

Country Status (6)

Country Link
US (1) US8165740B2 (fr)
EP (1) EP1676390A1 (fr)
JP (1) JP4384171B2 (fr)
CN (1) CN1833394B (fr)
DE (1) DE10335905B4 (fr)
WO (1) WO2005015816A1 (fr)

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FR2906298B1 (fr) * 2006-09-25 2008-12-26 Valeo Sys Controle Moteur Sas Systeme de commande de soupape a detection de defaillance
FR2929780A1 (fr) * 2008-04-08 2009-10-09 St Microelectronics Rousset Detection de donnees recues par un dispositif maitre dans un protocole de communication unifilaire
DE102012220803B4 (de) * 2012-11-14 2021-06-10 Bayerische Motoren Werke Aktiengesellschaft Vorrichtung zur Spannungsversorgung einer Systemkomponente und Systemkomponente
FR3082959A1 (fr) * 2018-06-26 2019-12-27 Stmicroelectronics (Rousset) Sas Commande cyclique de cellules d'un circuit integre
CN108964717B (zh) * 2018-08-02 2021-05-28 重庆川仪自动化股份有限公司 基于单根控制线nrz电流编码电路
DE102018132024A1 (de) 2018-12-13 2020-06-18 Valeo Schalter Und Sensoren Gmbh Netzwerkkommunikationssystem mit bidirektionaler Strommodulation zur Datenübertragung
CN111325964B (zh) * 2020-03-11 2021-08-13 江阴长仪集团有限公司 一种用于智能电能表的无线模块及编码自动配对方法
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Also Published As

Publication number Publication date
WO2005015816A1 (fr) 2005-02-17
US8165740B2 (en) 2012-04-24
DE10335905A1 (de) 2005-02-24
US20080217076A1 (en) 2008-09-11
JP2007501549A (ja) 2007-01-25
DE10335905B4 (de) 2018-07-05
CN1833394B (zh) 2010-06-09
JP4384171B2 (ja) 2009-12-16
CN1833394A (zh) 2006-09-13

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