EP1374365A2 - Detecteur a raccorder a un bus et procede d'alimentation en energie d'un detecteur raccorde a un bus - Google Patents

Detecteur a raccorder a un bus et procede d'alimentation en energie d'un detecteur raccorde a un bus

Info

Publication number
EP1374365A2
EP1374365A2 EP02729809A EP02729809A EP1374365A2 EP 1374365 A2 EP1374365 A2 EP 1374365A2 EP 02729809 A EP02729809 A EP 02729809A EP 02729809 A EP02729809 A EP 02729809A EP 1374365 A2 EP1374365 A2 EP 1374365A2
Authority
EP
European Patent Office
Prior art keywords
bus
sensor
energy
logic module
sensor element
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Withdrawn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
EP02729809A
Other languages
German (de)
English (en)
Inventor
Werner Nitschke
Klaus-Dieter Meier
Knut Balzer
Ewald Mauritz
Heiko Buehring
Hans Bogenrieder
Bernd Pfaffeneder
Holger Wulff
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
Conti Temic Microelectronic GmbH
Continental Automotive GmbH
Original Assignee
Robert Bosch GmbH
Conti Temic Microelectronic GmbH
Siemens AG
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, Conti Temic Microelectronic GmbH, Siemens AG filed Critical Robert Bosch GmbH
Publication of EP1374365A2 publication Critical patent/EP1374365A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices

Definitions

  • the invention is based on a sensor for connection to a bus or a method for supplying energy to a sensor connected to a bus according to the type of the independent claims.
  • the sensor according to the invention for connection to a bus or the method according to the invention for supplying energy to a sensor connected to a bus with the features of the independent claims has the advantage that the energy consumption of sensors connected to the bus is limited to a minimum.
  • the sensors then achieve characteristic electrical data of conventional ignition means, ie the operating energy of the sensors is not greater than that of a ignition agent. This allows more sensors to be connected to a bus. This is achieved by the so-called snapshot measurement is carried out. This means that the sensors and in particular slow sensors with a sampling rate of a few Hertz only carry out a few measuring cycles and are in a sleep mode most of the time, that is to say they require little or no current.
  • the measurement result is then stored in a logic module and, if necessary, transmitted via the bus.
  • the charging of the energy store for the sensor element of the sensor is monitored by an energy monitor in order to recognize when the energy store is charged to such an extent that the
  • Sensor element can be supplied with energy by the energy store for at least one measurement.
  • the lower energy consumption of the sensors makes it possible to design a bus with more than seven sensors, for example, and the simultaneous operation of ignition means.
  • the energy monitoring is assigned to the logic module and is therefore additionally designed as voltage monitoring.
  • the voltage monitor is also continuously supplied with electrical energy at the same time as the logic module, so that the energy store for the sensor element is continuously monitored in relation to the electrical energy stored in it.
  • the energy stores are designed as capacitors that can be made small and compact.
  • the logic module then stores the signals from the sensor element and later sends them via the bus. This enables data to be sent via the bus either on request by a bus master or automatically by a sensor.
  • FIG. 1 shows a circuit diagram of the sensor according to the invention
  • FIG. 2 shows a bus system with a connected sensor according to the invention
  • FIG. 3 shows a flow diagram of the method according to the invention.
  • a control device In a typical bus system for restraint systems, a control device is used as the bus master, while sensors and ignition devices are operated as slaves. Upon request, the slaves send their data to the master in specified time periods. A trigger algorithm is then calculated in the control unit with the sensor values, which possibly leads to a trigger decision, which is then transmitted to the ignition means via the bus.
  • the connected sensors and ignition means are assigned as slaves in an initialization phase, in which the slaves can transmit. In these time periods, the bus master switches the voltage on the bus lines to a lower value U actlv than is the case in the inactive bus phase U ⁇ nac ⁇ tv . Modulation of the energy on the bus lines by the individual slaves is only permitted with U actlv .
  • the sensor is now developed in such a way that the sensor element as a main current consumer is only operated in short measuring cycles, but is not used for measurement most of the time. This is achieved by charging an energy store and only when the energy store reaches a predetermined threshold value does a measurement cycle begin. These measurement results are then transmitted by the sensor either on request or automatically via the bus. The sensor element is therefore not operated during the charging phase of the energy store.
  • the logic module which is used for sequence control in the sensor, and also the voltage monitoring of the energy store carries out, is assigned to an energy store, which ensures that during the active communication phase, during which the logic module cannot be supplied with energy via the bus, the necessary electrical energy is supplied by this additional energy store.
  • FIG. 2 shows a configuration of a bus system to which a bus master 1, which here is a control device as described above, is connected via a bus line 2 to a sensor 3 according to the invention and two ignition means 4 and 5.
  • the sensor 3 is here a belt buckle sensor that is only operated with a low sampling rate. It is therefore not necessary to make the sensor 3 take a measurement frequently, so it can be in one at most times
  • the ignition means 4 and 5 are belt tensioners. Instead of the parallel bus system shown here, it is possible to choose a ring or a daisy channel or a combination of different bus configurations.
  • the control device 1 uses the sensor values to calculate the triggering algorithm and, if necessary, transmits a triggering decision to the ignition means 4 and 5.
  • the bus line 2 is here a two-wire line, which can alternatively also be designed as a single-wire line.
  • Figure 1 shows a circuit diagram of the sensor according to the invention.
  • Two bus connections a and b are connected to a rectifier G. Because a bus system for restraint systems is high due to the necessary safety
  • a diode D1 and a switch S4 are each connected to the rectifier G with their anode.
  • the other side of the switch S4, a logic module L, a sensor element S, a switch S2, an anode of a diode D2, a switch S3 and an anode of a diode D3 are connected to a further connection of the rectifier G.
  • Another connection of the logic module L, an anode of a diode D4 and a capacitor C E ⁇ are connected to the cathode of the diode Dl.
  • the switch S2 is on its other side with a
  • Capacitor C E2 and the cathode of diode D3 connected.
  • the switch S3 is connected on its other side to the capacitor C E ⁇ and the cathode of the diode D2.
  • the cathode of the diode D4 is connected to a switch S4.
  • the other side of the switch Sl leads to a second contact of the
  • the switch S1 connects the cathode of the diode D4 to the capacitor C E2 in a first position and the sensor element S to the capacitor C E2 in a second position.
  • the control of the switch S1 is carried out by a line, not shown here, through the logic module L.
  • a voltage monitoring line is also connected to the capacitor C E2 and the switch S1, which leads to the logic module L, so that there is a
  • Voltage monitoring of the capacitor C E2 can be performed.
  • the sensor element S is connected to the logic module L via an output via which an analog signal is transmitted from the sensor element S, and the sensor element S is connected to the logic module L via an input. This input is used to trigger the measurement carried out by the sensor element S.
  • the logic module L is connected to the switch S2 via a second output in order to actuate the switch S2.
  • the logic module L is connected to the switch S3 via a third output in order to actuate the switch S3.
  • the logic module L is connected to the switch S1 via a fourth output in order to actuate the switch S1.
  • the switches S2 and S3 are closed, so that the capacitors C E1 and C E2 can charge. They charge themselves up to a voltage around the value U ⁇ nactlv .
  • the diode D4 ensures that the capacitor does not discharge through the capacitor C E ⁇ .
  • the diode D4 serves to charge the capacitor C E2 more slowly.
  • the switch S1 is in the upper position, so that the switch S1 connects the capacitor C E2 to the cathode of the diode D4.
  • the capacitor C E2 can then be charged with the charging current I L2 .
  • the capacitor C E1 which is connected directly to the cathode of the diode Dl, charges with the charging current I L1 .
  • Switch S4 is open because it is only closed when the measurement result is sent.
  • the switch S4 is used to modulate the energy. It is also opened in the active bus phase to generate a logical 0, while closing S4 generates a logical 1. In this active bus phase, the voltage U actlv is on the
  • the logic module L recognizes via the voltage monitoring line when the capacitor C E2 is charged to such an extent that a measurement with the sensor element S with the energy that is charged in the capacitor C E2 is possible.
  • the second time begins and the switch S1 is switched to the lower position in order to connect the sensor element S to the capacitor C E2 , which can now discharge via the sensor element S and thus the sensor element S with electrical Energy supplied.
  • the switch S2 is opened so that the capacitor C E2 can discharge only via the switch S1 and the sensor element S.
  • the capacitor C E1 discharges through the logic module L if the switch S4 is closed and the voltage on the bus line is switched to Uactiv. This enables the
  • Logic module L is always supplied with electrical energy.
  • the diode D1 prevents drainage via the bus line a and b.
  • the voltage level on the bus lines is switched between two levels, U ⁇ nactlv and U actl v U act; LV is significantly smaller than U ⁇ nactl ⁇ .
  • C Ei and C E2 are charged as energy reserves to a voltage around U ⁇ nactlv , the diode Dl blocks during the time of active data transmission, ie a level of U act ⁇ V on the bus line.
  • the current source via S4 therefore loads the bus, but not the sensor circuit decoupled via DI.
  • the sensor element S If the measurement was carried out with the sensor element S, which is designed here as a Hall element, then the sensor element S transmits via its output an analog signal corresponding to the measurement, which the logic module L digitizes with an integrated analog / digital converter and in one stores registers arranged in logic module L.
  • the logic module L has transmitted a signal triggering the measurement to the sensor element S via the first output, so that the measurement by the Sensor element S can begin.
  • the logic module L either sends the measurement results via the connections a and b and the bus 2 after completion of the measurement or on request, for example by the bus master 1.
  • the switch S4 is closed and the current I TR is used as the transmission current.
  • By closing and opening switch S4 in the active bus phase (Uactiv on bus line 2) digital signals can be generated.
  • the Manchester coding is used here as coding.
  • the switches S1, S2, S3 and S4 are designed here as transistors.
  • the diodes D1 and D2 on the one hand enable the capacitors C E2 and C E ⁇ to be charged and on the other hand that the capacitors discharge in the corresponding direction.
  • the sensor 3 is also the ignition means 4 and 5 slaves in comparison to the bus master 1.
  • the energy stores that is to say the capacitors C E ⁇ and C E2 , are charged via the diode Dl and by the switch S1 in the upper position and the closed switches S2 and S3.
  • the charging currents I ⁇ and I 2 then flow.
  • the logic module L has the voltage monitoring, which detects when the capacitor C E2 has enough energy to supply the sensor element S for at least one measurement. Instead of one measurement, several measurements can be carried out. It is therefore checked in method step 7 whether the voltage across the capacitor C E2 is above a predetermined threshold value. This threshold value characterizes the energy required for the sensor element S.
  • step 6 If this has not been achieved, the charging of the capacitor C E2 is continued in step 6. If, however, the voltage is above the threshold value, then switch S2 is opened in method step 8 and switch S1 is switched to the lower position in order to supply the sensor element S with energy by C E2 . Furthermore, the logic element L transmits a signal triggering the measurement to the sensor element S. The actual measurement is then carried out in method step 9.
  • these measurement signals are then transferred to the logic module L from the sensor element S as an analog signal.
  • the logic module L stores the measurement signals in a register after digitization. Then the
  • Switch S4 is used, either on request by bus master 1 or automatically, to transmit the measurement signal via bus 2 to bus master 1. For this purpose, switch S4 is opened and closed in order to generate digital signals. This then creates the transmission current I TR .
  • the switch S3 is opened at the same time, so that the energy store C E ⁇ supplies the logic module with energy during this time of the bus communication. Even if the capacitor C E2 discharges via the sensor element S, the capacitor C E ⁇ continues to be charged by the current on the bus 2 via the connections a and b. C E ⁇ is only discharged in the active bus phase, since then the voltage on the bus line is switched to U actlv and the logic module L must be supplied by C E ⁇ .
  • the switch S4 is continuously opened again and the switches S2 and S3 are closed and the switch S1 is switched to the upper position, so that the charging of the capacitors C E ⁇ and C E2 can begin again. This is then done in process steps 11 and 12. The system then jumps back to step 6 accordingly.
  • C E1 charging in the inactive bus phase.
  • C E2 can also only charge in the inactive bus phase, but can also discharge again when C E2 has reached the specified voltage value in order to enable measurement by the sensor element,

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Dc-Dc Converters (AREA)
  • Air Bags (AREA)

Abstract

L'invention concerne un détecteur à raccorder à un bus et un procédé d'alimentation en énergie d'un détecteur raccordé à un bus, dont le but est de minimiser la consommation d'énergie d'un détecteur raccordé au bus. A cet effet, de l'énergie pour le détecteur est chargée pendant une première durée dans un accumulateur d'énergie et est déchargée pendant une seconde période, autrement dit le temps de mesure, afin d'alimenter l'élément de détection en énergie. L'accumulateur d'énergie utilisé est un condensateur et la charge dudit condensateur est contrôlée par un contrôle de tension.
EP02729809A 2001-03-29 2002-03-21 Detecteur a raccorder a un bus et procede d'alimentation en energie d'un detecteur raccorde a un bus Withdrawn EP1374365A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10115411A DE10115411A1 (de) 2001-03-29 2001-03-29 Sensor zum Anschluß an einen Bus und Verfahren zur Energieversorgung eines an einen Bus angeschlossenen Sensors
DE10115411 2001-03-29
PCT/DE2002/001023 WO2002080130A2 (fr) 2001-03-29 2002-03-21 Detecteur a raccorder a un bus et procede d'alimentation en energie d'un detecteur raccorde a un bus

Publications (1)

Publication Number Publication Date
EP1374365A2 true EP1374365A2 (fr) 2004-01-02

Family

ID=7679469

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02729809A Withdrawn EP1374365A2 (fr) 2001-03-29 2002-03-21 Detecteur a raccorder a un bus et procede d'alimentation en energie d'un detecteur raccorde a un bus

Country Status (5)

Country Link
US (1) US7176587B2 (fr)
EP (1) EP1374365A2 (fr)
JP (1) JP4129184B2 (fr)
DE (1) DE10115411A1 (fr)
WO (1) WO2002080130A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10155189A1 (de) * 2001-11-12 2003-07-03 Endress & Hauser Gmbh & Co Kg Verfahren zur Regelung der Stromversorgung mehrerer Feldgeräte
DE102015115273A1 (de) * 2015-09-10 2017-03-16 Endress+Hauser Gmbh+Co. Kg Elektronische Schaltung zum autarken Versorgen eines ersten und zweiten Moduls eines Feldgeräts, Feldgerät und entsprechendes Verfahren
DE102018122014A1 (de) 2018-09-10 2020-03-12 Endress + Hauser Flowtec Ag Meßgeräte-System sowie damit gebildete Meßanordnung
CN109590559B (zh) * 2019-02-20 2020-11-13 航天科工哈尔滨风华有限公司 一种五轴电火花加工闭式叶轮轨迹规划方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3719869A1 (de) * 1987-06-13 1988-12-29 Messerschmitt Boelkow Blohm Einrichtung zur energieversorgung einer elektronischen signalverarbeitungsstufe
DE3738862A1 (de) * 1987-11-16 1989-05-24 Bosch Gmbh Robert Verfahren zum betrieb einer sicherheitseinrichtung fuer fahrzeuginsassen
JPH01190054A (ja) * 1988-01-25 1989-07-31 Man Design Kk 受信機
US5357141A (en) * 1988-04-02 1994-10-18 Robert Bosch Gmbh Electronic device
DE3811217A1 (de) 1988-04-02 1989-10-12 Bosch Gmbh Robert Elektronische einrichtung
DE4112665A1 (de) * 1991-04-18 1992-10-22 Bosch Gmbh Robert Einrichtung zur erfassung einer veraenderlichen groesse in kraftfahrzeugen
FI90606C (fi) * 1991-12-19 1994-02-25 Nokia Mobile Phones Ltd Kytkentä akkujännitteen kasvattamiseksi lyhytaikaisen kuormituksen ajaksi
US5420790A (en) * 1994-03-10 1995-05-30 Delco Electronics Corporation Energy reserve circuit for supplemental inflatable restraint
US5585777A (en) * 1994-06-07 1996-12-17 Rosemount Inc. Transmitter with electrical circuitry for inhibiting discharge of stored energy
DE19527420B4 (de) * 1995-07-27 2004-04-01 Robert Bosch Gmbh Elektronisches Gerät
JP3167336B2 (ja) * 1996-03-08 2001-05-21 シーメンス アクチエンゲゼルシャフト 自動車における乗員保護手段の制御のための装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02080130A2 *

Also Published As

Publication number Publication date
US7176587B2 (en) 2007-02-13
US20040172205A1 (en) 2004-09-02
WO2002080130A2 (fr) 2002-10-10
WO2002080130A3 (fr) 2003-04-10
JP4129184B2 (ja) 2008-08-06
DE10115411A1 (de) 2002-10-10
JP2005502935A (ja) 2005-01-27

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Inventor name: NITSCHKE, WERNER

Inventor name: WULFF, HOLGER

Inventor name: BUEHRING, HEIKO

Inventor name: MAURITZ, EWALD

Inventor name: PFAFFENEDER, BERND

Inventor name: MEIER, KLAUS-DIETER

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Owner name: ROBERT BOSCH GMBH

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