EP2419744A2 - Module capteur dans un système de sécurité d'un véhicule automobile et procédé de fonctionnement d'un tel module capteur - Google Patents

Module capteur dans un système de sécurité d'un véhicule automobile et procédé de fonctionnement d'un tel module capteur

Info

Publication number
EP2419744A2
EP2419744A2 EP10707546A EP10707546A EP2419744A2 EP 2419744 A2 EP2419744 A2 EP 2419744A2 EP 10707546 A EP10707546 A EP 10707546A EP 10707546 A EP10707546 A EP 10707546A EP 2419744 A2 EP2419744 A2 EP 2419744A2
Authority
EP
European Patent Office
Prior art keywords
sensor module
sensor
energy
signal
module according
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Withdrawn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
EP10707546A
Other languages
German (de)
English (en)
Inventor
Bernd Tollkuehn
Peter Guse
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 EP2419744A2 publication Critical patent/EP2419744A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
    • G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
    • G01P3/488—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by variable reluctance detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for

Definitions

  • Sensor module for a vehicle safety system and method for operating such a sensor module
  • the invention relates to a sensor module for a vehicle safety system or a method for operating such a sensor module according to the preamble of the independent claims.
  • a wireless rotational speed sensor is known in which the rotational speed of a motor vehicle wheel is measured and the measured values taken by the sensor are processed into a data telegram which indicates the rotational speed of the wheel. Furthermore, the sensor is configured such that the data telegram is transmitted wirelessly.
  • the present sensor component includes a battery or other type of power or power source that generally provides relatively little power, such as power. B. from a supply with lower
  • a so-called ECU component may instruct the sensor component to enter a sleep mode to conserve battery power since the vehicle may be stopped.
  • a wireless speed sensor system is known in the necessary energy is generated and / or stored to the wireless
  • an energy management uses a generator for power generation, which makes use of the rotation of the vehicle wheel for power generation.
  • Storage devices are a high-efficiency rechargeable battery or a supercapacitor.
  • a generator a so-called multi-polar rotation generator can be used become.
  • the transmitter element may be switched to a sleep mode or inactive until the controller wakes up the sensor via its transmitter module.
  • the sensor module according to the invention for a vehicle safety system or the corresponding method for operating such a sensor module have the advantage that the same device with which the sensor signal is generated inductively, the energy is also produced inductively.
  • This multiple use of components with this device provides for a compact design, so that the sensor module can be made very small. Thus, the installation space to be made available is considerably reduced. This ultimately leads to a cost reduction.
  • Number of pole pairs on this encoder can increase the change of the magnetic flux per time. This increases the spatial resolution and also the induced voltage.
  • a structural unit such as a
  • the sensor module can have the actual sensor element, in which case, for example, the Hall effect of the anisotropic magnetoresistive effect (AM R) and the giant magnetoresistance (GMR effect) can be used.
  • ASIC an application-specific integrated circuit, is also present in a conventional manner, which carries out a preprocessing of the sensor signals.
  • the sensor module is a closed structural unit. Only
  • Connecting means for installation are provided.
  • the vehicle safety system is, for example, a vehicle dynamics control system, a brake system and / or an airbag system.
  • the transmitter for wireless transmission of data as a function of the sensor signal is at least a radio transmitter which can use, for example, high frequency spread such as DSSS: Direct Sequence Spread Spectrum or Continuous Frequency Hopping Spread Spectrum (FHSS). Also a so-called
  • the power supply can also take place via emitted electromagnetic waves, wherein the induced current is rectified in an antenna coil in the sensor module and charges an energy store.
  • the energy storage supplies the chip for the current for the reading process or can only be used for the supply of the microchip.
  • the signal transmission takes place directly from the transmitter in a control unit or from an external transmitter to the sensor.
  • the RFID tag modulates the electromagnetic wave and thus transmits the information.
  • the data are, for example, data telegrams in which the actual sensor values are accommodated.
  • the sensor signal represents the sensor values that the sensor element emits. This can also be a multiplex of sensor signals.
  • this data telegram can also contain further data such as
  • the device is, for example, a spool as is apparent from a dependent claim.
  • This coil can have a wide variety of structures. In particular, it can also be done on a microchip
  • the device has the property that it simultaneously generates the sensor signal and the energy for the sensor module.
  • the operation of the sensor module means the commissioning of the sensor module.
  • Inductive in the present case is the detection of the change in the magnetic flux according to the law of induction. - A -
  • the device may have at least one coil.
  • the device may have only one coil.
  • the device is configured such that the energy and the sensor signal are generated by the induction by a linear movement or a rotational movement.
  • the rotational movement can be realized for example in speed sensors by a rotating steel wheel or a Multipolencoder, which is designed as a disc.
  • the sensor module has as an energy store for the energy at least one capacitor, which is used to protect the component against the irradiation of electromagnetic waves (transient disturbances). At the same time, the radiation of electromagnetic waves is also damped.
  • the sensor module has a multipole encoder with more than 48 pole pairs. This is easily possible by the present configuration with the wireless transmission of the data and allows a high
  • the sensor module is configured for a low-power and a high-power mode, wherein the sensor module has a change-over switch, which depends on a vehicle size and / or an event between the low-power and switch to high-power mode.
  • the low-power mode means a state in which the sensor module consumes little energy, while the high-power mode uses correspondingly more energy, ie the high-power mode consumes more energy than the low-power mode .
  • the switch can be customary manner by software but also electronically or mechanically. The action on this switch takes place in dependence on a vehicle size, for example, the vehicle speed and / or an event such as a
  • Wheel condition like a slip or blocking wheels.
  • the event-dependent activation of the changeover switch is dependent on a rule.
  • the data transmission rate of the transmitter can thus be vehicle-speed-dependent or rule-based.
  • the data in a microcontroller or other processor or evaluation circuit is processed at a low clock rate and sent at a low data rate from the sensor module to a controller, at high speed this is reversed.
  • the clock frequency for data processing in the microcontroller and the data transfer rate during normal operation is low.
  • the sensor module has an energy management with this switch, which is arranged on an integrated circuit on which a preprocessing of the sensor signal is provided.
  • these functions can be integrated with one another on an ASIC and a particularly cost-effective compact production can be selected.
  • 1 is a block diagram of a vehicle safety system
  • 2 shows a first embodiment of a speed sensor
  • FIG. 4 shows a block diagram of the sensor module according to the invention and of a control device
  • Fig. 6 is a block diagram of the transmitter
  • FIG. 7 shows a flow chart of the method according to the invention.
  • FIG. 1 shows in a block diagram a vehicle safety system in a vehicle FZ with four speed sensors WSS1 to 4, a control unit for the vehicle dynamics control ESP and an ESP-controlled by the ESP control unit actuator AKT.
  • the speed sensor WSSL to 4 are connected via a radio transmission with the control unit ESP, so that the speed sensor WSSl to 4 each have antennas Al to A4 to transmit their data to the control unit ESP, the control unit ESP for receiving this data, the antenna A5 having.
  • at least each rotational speed sensor WSS1 to 4 has a transmission module in order, for example, to transmit data to the control device ESP in the frequency spreading method, wherein the control device ESP has at least one transmission module
  • Receiver device to correctly receive and demodulate these signals can. It is possible that the radio connection between the speed sensors WSSL to 4 and the control unit ESP can be unidirectional from the speed sensors to the control unit ESP or bidirectional. A broadcast mode is also possible. By that is meant that a sensor
  • the speed sensors transmit their data to another device, for example, another sensor, which then has a Cable connection is connected to the control unit ESP and then performs this second part then via a wired transmission of data.
  • the control unit ESP controls in response to this sensor and other sensor signals to the actuators AKT, for example, brakes.
  • other sensors for vehicle safety systems such as crash sensors so acceleration sensors, gyroscopes, force sensors, structure-borne sound sensors, air pressure sensors and environment sensors such as video, radar, lidar or ultrasound are wirelessly connectable to a controller.
  • Fig. 2 shows the operation of an active speed sensor, which is connected to the power source for operation with a voltage source.
  • the sensors detect the change in the magnetic flux density.
  • a Hall sensor is provided as the sensor element 22, which measures the change in the magnetic flux density of the steel wheel 20.
  • a magnet 21 is still provided, which is changed by the rotating steel wheel in its magnetic field.
  • the resulting signal is a sine signal 23, which is forwarded to the control unit ECU for further processing.
  • a multipole encoder 30 is provided as a wheel with changing magnetic poles. The rotation of this wheel causes a change in the magnetic flux in the sensor element 31.
  • the signals of the sensor element are evaluated by an ASIC and then transmitted as digital signals to a control unit ECU. These digital signals are designated by the reference numeral 32.
  • the signal is conditioned by the ASIC and provides a signal with motion-independent constant amplitude, which also for each sensor continuously via radio to the
  • Transfer control unit and there further processed in a microcontroller Transfer control unit and there further processed in a microcontroller.
  • Fig. 4 shows a block diagram of the sensor module according to the invention denoted by the reference numerals 40 to 45 and the control unit ECU.
  • the sensor module according to the invention has a single device 40 for simultaneous generation of the sensor signal and the energy.
  • an energy management 41 which is arranged in an ASIC manner, the energy is stored in an energy store 42, for example a capacitor, which is also used for EMC (electromagnetic compatibility).
  • the sensor signal is transmitted to a digital-to-analog converter inside or outside a microcontroller 43.
  • the microcontroller 43 stores the sensor signals in a ring buffer 44 and transmits the data from the ring buffer via a transceiver 45 via radio signals to another transceiver 46 of the control unit ECU when vehicle variables such as the vehicle speed and / or events such as a wheel lock or slippage show this. These data can be obtained either from the sensor signal itself or from the ECU. For this purpose, the radio traffic is also designed bidirectional.
  • the ASIC forms a speed-dependent voltage signal from the sensor signal, which is already processed digitally in the sensor module. The microcontroller 43 can do this
  • Convert sensor signal into ECU-specific signal it evaluates and stores the data continuously in the ring buffer.
  • the stored data are usually z. B. at an impermissible speed change then available and are forwarded to the transceiver 45 to transmit it to the control unit ECU.
  • This speed or acceleration signal can be transmitted either directly to the ECU with the transmitter 45 or transceiver at fixed discrete intervals to the ECU or the signal is previously processed in the microcontroller and evaluated.
  • the above-described speed-dependent or rule-based data transmission rate of the transceiver 45 can then be set.
  • Fig. 5 visualizes a section of the sensor module according to the invention.
  • Coil SP is connected to an ASIC on the one hand for the sensor processing PP and on the other hand for the generation of energy EE.
  • the power supply EE can in particular charge a capacitor C or other capacitors or energy storage. That of the sensor signal preprocessing PP conditioned sensor signal is transmitted to the transceiver TX, which radiates via the antenna AT, the data in response to the sensor signal.
  • the digital signal can first be converted into an analog signal in order to amplify it and then modulate it, for example via a frequency spread or frequency hopping.
  • the modulation MOD can also already be done in digital form and an amplifier can still be used after the modulation.
  • the receiver structure is designed: After a receiving antenna usually follows a frequency converter, an amplifier and filter and a digital signal processing.
  • step 700 shows a flow chart of the method according to the invention.
  • simultaneous sensor signal and power generation takes place, for example, with coil SP.
  • the sensor signal is in
  • Process step 701 preprocessed and provides, for example, parameters that the energy management in step 702 requires to decide whether to switch between a low-power and a high-power mode of the sensor module.
  • the preprocessed sensor signal is prepared for transfer 704 and in process step
  • the preparation for the transmission is, for example, the design of the data telegram.
  • the energy management decides in step 703, how much energy is to be provided so high-power or low-power mode or which consumption can be adjusted by the clock rate of processing or transmission rate of the transmission over the

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

L'invention concerne un module capteur pour un système de sécurité d'un véhicule automobile et un procédé de fonctionnement d'un tel module capteur. À l'aide d'un émetteur, des données sont envoyées par sans fil en fonction d'un signal du capteur. Le signal de capteur et une énergie nécessaire pour le fonctionnement du module capteur sont produits par induction par le même dispositif.
EP10707546A 2009-03-17 2010-03-11 Module capteur dans un système de sécurité d'un véhicule automobile et procédé de fonctionnement d'un tel module capteur Withdrawn EP2419744A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200910001616 DE102009001616A1 (de) 2009-03-17 2009-03-17 Sensormodul für ein Fahrzeugsicherheitssystem und Verfahren zum Betreiben eines solchen Sensormoduls
PCT/EP2010/053108 WO2010105963A2 (fr) 2009-03-17 2010-03-11 Module capteur dans un système de sécurité d'un véhicule automobile et procédé de fonctionnement d'un tel module capteur

Publications (1)

Publication Number Publication Date
EP2419744A2 true EP2419744A2 (fr) 2012-02-22

Family

ID=42173944

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10707546A Withdrawn EP2419744A2 (fr) 2009-03-17 2010-03-11 Module capteur dans un système de sécurité d'un véhicule automobile et procédé de fonctionnement d'un tel module capteur

Country Status (4)

Country Link
EP (1) EP2419744A2 (fr)
CN (1) CN102356320A (fr)
DE (1) DE102009001616A1 (fr)
WO (1) WO2010105963A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014015129A1 (de) * 2014-10-14 2016-04-14 Wabco Gmbh Verfahren zur Identifikation einer Sensorvorrichtung zur Drehzahlmessung, Sensorvorrichtung zur Drehzahlmessung und Fahrzeug mit wenigstens einer Sensorvorrichtung zur Drehzahlmessung
US10473678B2 (en) 2016-04-18 2019-11-12 Ford Global Technologies, Llc Detection and wireless transmission of wheel rotation direction

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69320297T2 (de) * 1992-10-19 1998-12-17 Skf Ab Verfahren und Vorrichtung zur Messung von Betriebszuständen in einem Lager
US7034711B2 (en) * 2001-08-07 2006-04-25 Nsk Ltd. Wireless sensor, rolling bearing with sensor, management apparatus and monitoring system
US6892587B2 (en) * 2002-03-08 2005-05-17 Ntn Corporation Rotation detecting device and wheel support bearing assembly utilizing the same
US20040150516A1 (en) 2003-02-05 2004-08-05 Delphi Technologies, Inc. Wireless wheel speed sensor system
US7021127B2 (en) * 2004-01-12 2006-04-04 Delphi Technologies, Inc. Self-powered wireless sensor assembly for sensing angular position of the engine crankshaft in a vehicle
US7408452B2 (en) 2005-10-24 2008-08-05 Infineon Technologies Ag Wireless wheel speed sensor
DE102006011361B4 (de) * 2006-03-09 2010-08-26 Lenord, Bauer & Co. Gmbh Umdrehungszähler
DE102008008720A1 (de) * 2008-02-12 2009-08-27 Knorr-Bremse Systeme für Nutzfahrzeuge GmbH Messvorrichtung zur Messung von relativen Drehgeschwindigkeiten mit drahtloser Signalübertragung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010105963A3 *

Also Published As

Publication number Publication date
WO2010105963A2 (fr) 2010-09-23
WO2010105963A3 (fr) 2010-12-23
DE102009001616A1 (de) 2010-09-23
CN102356320A (zh) 2012-02-15

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