EP3047299A1 - Procédé permettant de faire fonctionner un capteur d'ultrasons d'un véhicule automobile lors de l'émission d'un signal d'émission, dispositif de détection d'ultrasons et véhicule automobile - Google Patents

Procédé permettant de faire fonctionner un capteur d'ultrasons d'un véhicule automobile lors de l'émission d'un signal d'émission, dispositif de détection d'ultrasons et véhicule automobile

Info

Publication number
EP3047299A1
EP3047299A1 EP14750460.9A EP14750460A EP3047299A1 EP 3047299 A1 EP3047299 A1 EP 3047299A1 EP 14750460 A EP14750460 A EP 14750460A EP 3047299 A1 EP3047299 A1 EP 3047299A1
Authority
EP
European Patent Office
Prior art keywords
transmission
frequency
ultrasonic sensor
signal
motor vehicle
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Withdrawn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
EP14750460.9A
Other languages
German (de)
English (en)
Inventor
Tobias Haar
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.)
Valeo Schalter und Sensoren GmbH
Original Assignee
Valeo Schalter und Sensoren 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 Valeo Schalter und Sensoren GmbH filed Critical Valeo Schalter und Sensoren GmbH
Publication of EP3047299A1 publication Critical patent/EP3047299A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S15/582—Velocity or trajectory determination systems; Sense-of-movement determination systems using transmission of interrupted pulse-modulated waves and based upon the Doppler effect resulting from movement of targets
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
    • G01S15/50—Systems of measurement, based on relative movement of the target
    • G01S15/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
    • G01S15/60—Velocity or trajectory determination systems; Sense-of-movement determination systems wherein the transmitter and receiver are mounted on the moving object, e.g. for determining ground speed, drift angle, ground track
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/87—Combinations of sonar systems
    • G01S15/876—Combination of several spaced transmitters or receivers of known location for determining the position of a transponder or a reflector
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/523—Details of pulse systems
    • G01S7/526—Receivers
    • G01S7/527—Extracting wanted echo signals
    • G01S7/5276—Extracting wanted echo signals using analogue techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
    • G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2015/937—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details
    • G01S2015/938—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details in the bumper area

Definitions

  • the invention relates to a method for operating an ultrasonic sensor of a
  • the invention when sending a transmission signal in an area surrounding the motor vehicle.
  • the invention also relates to an ultrasonic sensor device which is designed to carry out such a method and has an ultrasonic sensor and a control device which serves to drive the ultrasonic sensor.
  • the invention also relates to a motor vehicle, in particular a motor vehicle
  • Ultrasonic sensors for motor vehicles are already known from the prior art. They are usually used to assist the driver in performing
  • the ultrasonic sensors belong to one
  • Driver assistance device or a driver assistance system which or which is referred to as a parking aid.
  • ultrasonic sensors are now increasingly used outside of this actual parking assistance functionality, such as
  • the ultrasonic sensors By means of the ultrasonic sensors, overall distances between the motor vehicle and target objects or obstacles located in its surroundings can be measured.
  • the ultrasonic sensors work according to the echo delay principle. This means that the distance measurement in ultrasound technology takes place by means of an echolocation method.
  • the ultrasonic sensor transmits a transmission signal - ultrasound - and receives a reception signal, which is also a sound signal and which is that of a
  • ultrasonic waves are emitted, reflected by an object and again received and evaluated by the same ultrasonic sensor and / or another ultrasonic sensor of the same motor vehicle.
  • the distance and possibly also the relative position of the target object relative to the motor vehicle are then determined.
  • so-called cross measurements are also known in which a first ultrasonic sensor emits the transmission signal, but the reception signal is received by another ultrasonic sensor of the same motor vehicle. It is also state of the art (eg DE 10 201 1 109 915 A1) to modulate the transmission signal of an ultrasonic sensor, so that with the transmission signal a specific
  • Codeword - namely an identifier - is transmitted.
  • This transmission signal can then be from other interference signals or sound signals from other sensors or other
  • the received signal can be distinguished from the ultrasound signals of other motor vehicles;
  • each ultrasonic sensor sends a transmission signal with an associated specific identifier and can then recognize its own sound signal again.
  • the reception signal must also be able to be demodulated. It must therefore be checked whether the received received signal has the same identifier as the transmission signal and thus is the transmission signal reflected by an object.
  • the received received signals are checked for their coding by means of correlation. The result of the correlation is a measure of the match between the received
  • Ultrasound signal and the expected thus, a correlation between the received signal and a reference signal is calculated, the reference signal corresponding to the transmitted signal transmitted. If a relatively large correlation between the received signal and the reference signal is detected, then it is determined that the received signal is the own signal of the ultrasonic sensor.
  • Doppler shift means that the frequency of the transmitted transmission signal shifts and the received signal has a reception frequency different from the transmission frequency of the transmission signal. Due to the Doppler shift, the demodulation of the received signal is relatively complex. For the
  • Doppler banks must be used to reliably demodulate the received signal even with a Doppler shift and thus be able to recover the above-mentioned codeword safely.
  • This object is achieved by a method by an ultrasonic sensor device and by a motor vehicle with the features according to the respective independent claims.
  • Advantageous embodiments of the invention are the subject of the dependent claims, the description and the figures.
  • a method according to the invention serves for operating an ultrasonic sensor of a motor vehicle when emitting a transmission signal into an environmental region of the motor vehicle. A Doppler shift which the probing signal is likely to undergo in the surrounding area is estimated. Then one will
  • the Doppler shift is estimated in advance even before the transmission signal is transmitted and the transmission frequency is determined as a function of the probable Doppler shift
  • Transmission signal is the effort in the demodulation of the received signal in
  • the received signal has a predetermined reception frequency or a reception frequency which is in a predetermined frequency value range.
  • the above-mentioned double banks for signal demodulation can be dispensed with or the number of required Doppler banks can be significantly reduced.
  • This effect is also helpful when coding or modulating transmit signals.
  • the frequency band can be restricted as a whole, and thus the Doppler banks responsible for the decoding in the receiver can be optimized. Also at
  • Cross measurements facilitate the demodulation of received signals from other sensors.
  • the determination of the transmission frequency is preferably such that a predetermined base transmission frequency, which is usually in the prior art for the transmission signal is used and is stored permanently in the ultrasonic sensor or a control device to increase or reduce the estimated Doppler shift, namely depending on the character or the direction of the Doppler shift.
  • the transmission frequency for the transmission signal is preferably set so that the reception frequency of the reception signal corresponds to the abovementioned base transmission frequency, which is shifted by the estimated Doppler shift in determining the transmission frequency for the transmission signal and thus influenced.
  • Reception frequency of the received signal is thus equal to the ideal or optimal base frequency, which reduces the effort in the evaluation of the received signal in the receiver to a minimum.
  • the reception frequency of the reception signal is constant by setting the transmission frequency - i. to a constant value - is regulated.
  • a membrane of the ultrasonic sensor is thereby excited to emit a respective transmission signal at the fixed transmission frequency. If the reception frequency is regulated to a constant value-in particular to the abovementioned base transmission frequency-then the plurality of Doppler banks can thus be dispensed with in the receiver.
  • the estimation of the Doppler shift can in principle be made in many different ways. In principle, it can be provided that, for the estimation of the Doppler shift, an own speed or the own speed of the motor vehicle relative to the roadway is first detected and taken into account in the estimation of the Doppler shift. In the simplest case, the estimate of the Doppler shift can even be based solely on the
  • the Doppler shift can be calculated directly from the airspeed here.
  • Target object is determined and estimating the Doppler shift below
  • Ultrasonic sensor from previous measurement cycles takes place. Additionally or alternatively, current measured values of a sensor other than the ultrasound sensor may also be taken into account, such as a lidar sensor and / or a radar sensor and / or another ultrasound sensor. If the signals from the immediately preceding measuring cycle of the ultrasonic sensor are taken into account, then the estimation of the Doppler shift can be carried out particularly precisely and without much effort.
  • the transmission signal is transmitted modulated, so that a predetermined code word is impressed on the transmission signal by this modulation.
  • a predetermined code word is impressed on the transmission signal by this modulation.
  • Sending signal emitted by a first ultrasonic sensor and the associated received signal is received by a second ultrasonic sensor and demodulated in the second ultrasonic sensor.
  • For putting in the transmission signals can thus be distinguished from other interference signals from external sources of interference. It is also possible to operate several ultrasonic sensors simultaneously, their signals
  • An inventive ultrasonic sensor device for a motor vehicle comprises an ultrasonic sensor for emitting a transmission signal in an environmental region of the motor vehicle and a control device for driving the ultrasonic sensor.
  • the control device is designed to estimate a Doppler shift of the transmission signal in the surrounding area, to set the transmission frequency for the transmission signal such that a reception frequency of a reception signal, that of the reception signal
  • Doppler shift shifted transmission frequency corresponds, is within a predetermined frequency range, and to control the ultrasonic sensor for transmitting the transmission signal with the specified transmission frequency.
  • a motor vehicle according to the invention in particular a passenger car, comprises an ultrasonic sensor device according to the invention.
  • FIG. 1 is a schematic representation of a motor vehicle with a
  • Fig. 3 to 5 are schematic representations for explaining the method.
  • the motor vehicle 1 is for example a passenger car.
  • the motor vehicle 1 comprises an ultrasonic sensor device 2, which has a plurality of ultrasonic sensors 3 and an electronic control device 4, for example in the form of a microcontroller or control device.
  • the number and arrangement of the ultrasonic sensors 3 are shown in FIG. 1 by way of example only and may vary depending on the embodiment. In the embodiment, a plurality of
  • the ultrasonic sensors 3 can each be arranged in a recess of the respective bumper 5, 6, so that the membranes of the respective ultrasonic sensors 3 are arranged within the respective continuous recess of the bumper 5, 6.
  • a concealed installation of the ultrasonic sensors 3 behind the respective bumper 5, 6 may be provided.
  • the membranes of the ultrasonic sensors 3 at the back the respective bumper 5, 6 arranged adjacent and send the ultrasonic signals through the material of the bumper 5, 6 through.
  • the ultrasonic sensors 3 are each for detecting distances to in one
  • a plurality of driver assistance systems may be provided, which are designed to provide different functionalities in the motor vehicle 1, based on the measured distances of the ultrasonic sensors 3.
  • driver assistance systems for example, the following systems can be provided: a parking assistance system, in which the measured distances acoustically and / or optically output
  • an automatic parking assistance system for automatically calculating a parking path and for automatic parking, an automatic brake assistance system which is used for autonomous braking of the motor vehicle 1 on the basis of a collision risk detected on the basis of the measured values of the ultrasonic sensors 3, a system for
  • the control device 4 can separately determine the transmission frequency of the respective transmission signal for each ultrasonic sensor 3 and control the ultrasonic sensor 3 for transmitting the transmission signal at the previously defined transmission frequency.
  • the method starts in a step S1 and proceeds to a further step S2, in which a new measurement cycle of the ultrasonic sensor 3 is initiated.
  • a Doppler shift fD is estimated, which the transmission signal in the surrounding area 7 is expected to experience. In other words, it is estimated how much the frequency of the transmission signal is likely to shift as it propagates in the surrounding area 7.
  • the intrinsic speed of the motor vehicle 1 is first detected and evaluated relative to the roadway.
  • a relative speed between motor vehicle 1 and target object 8 can also be determined and used in the estimation of
  • Doppler shift are taken into account.
  • the signals of the ultrasonic sensors 3 from previous measurement cycles and / or signals from other sensors can be taken into account.
  • the transmission frequency fS for the to be transmitted is taken into account.
  • step S5 Doppler shift fD shifted to the transmission frequency fS.
  • step S5 the transmission signal is transmitted with the transmission frequency fS already set.
  • step S6 the associated received signal is transmitted through it
  • a modulation When transmitting the transmission signal optionally also a modulation can be made. This may be, for example, a phase modulation and / or an amplitude modulation and / or a frequency modulation. Will one
  • Frequency modulation made, it may be at the above
  • Transmit frequency fS to the average frequency of the transmission signal act.
  • a predetermined code word is impressed on the transmission signal to enable the transmission signal of other signals
  • step S6 Upon receiving the received signal according to step S6, a corresponding demodulation of the received signal is then performed. In the present case, this can be done without much effort since the reception frequency corresponds to the base transmission frequency fB or lies within a tolerance range around this value.
  • FIG. 3 shows a scenario with the motor vehicle 1 and the target object 8 without one
  • FIG. 4 shows a scenario with a relative movement between motor vehicle 1 and target object 8 according to the prior art.
  • the method according to the invention is illustrated in FIG. 5.
  • the reception frequency fE is then A and thus corresponds to the base transmission frequency fB.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

L'invention concerne un procédé permettant de faire fonctionner un capteur d'ultrasons d'un véhicule automobile (1) lors de l'émission d'un signal d'émission dans une zone environnant le véhicule (1). Ledit procédé consiste à : évaluer un décalage Doppler (fD) auquel le signal d'émission sera probablement soumis dans la zone environnant le véhicule ; définir une fréquence d'émission (fS) pour le signal d'émission de telle manière qu'une fréquence de réception (fE) d'un signal de réception qui correspond à la fréquence d'émission (fS) décalée selon le décalage Doppler (fD) évalué se situe dans une plage de valeurs de fréquence prédéterminée, en particulier une fréquence d'émission de base (fB) ; et émettre le signal d'émission à la fréquence d'émission définie (fS).
EP14750460.9A 2013-09-17 2014-08-07 Procédé permettant de faire fonctionner un capteur d'ultrasons d'un véhicule automobile lors de l'émission d'un signal d'émission, dispositif de détection d'ultrasons et véhicule automobile Withdrawn EP3047299A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013015411.1A DE102013015411A1 (de) 2013-09-17 2013-09-17 Verfahren zum Betreiben eines Ultraschallsensors eines Kraftfahrzeugs beim Aussenden eines Sendesignals, Ultraschallsensorvorrichtung und Kraftfahrzeug
PCT/EP2014/066990 WO2015039805A1 (fr) 2013-09-17 2014-08-07 Procédé permettant de faire fonctionner un capteur d'ultrasons d'un véhicule automobile lors de l'émission d'un signal d'émission, dispositif de détection d'ultrasons et véhicule automobile

Publications (1)

Publication Number Publication Date
EP3047299A1 true EP3047299A1 (fr) 2016-07-27

Family

ID=51302971

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14750460.9A Withdrawn EP3047299A1 (fr) 2013-09-17 2014-08-07 Procédé permettant de faire fonctionner un capteur d'ultrasons d'un véhicule automobile lors de l'émission d'un signal d'émission, dispositif de détection d'ultrasons et véhicule automobile

Country Status (3)

Country Link
EP (1) EP3047299A1 (fr)
DE (1) DE102013015411A1 (fr)
WO (1) WO2015039805A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018110182B4 (de) * 2018-04-27 2023-03-30 Valeo Schalter Und Sensoren Gmbh Verfahren zum Betreiben eines Ultraschallsensors eines Kraftfahrzeugs mit Berücksichtigung einer Doppler-Verschiebung, Steuergerät, Ultraschallsensorvorrichtung sowie Fahrerassistenzsystem
US11733377B2 (en) 2018-05-07 2023-08-22 Texas Instruments Incorporated Time of flight and code signature detection for coded ultrasonic transmission
US11644555B2 (en) 2018-07-27 2023-05-09 Texas Instruments Incorporated Threshold generation for coded ultrasonic sensing
US11378686B2 (en) 2018-12-26 2022-07-05 Texas Instruments Incorporated Ultrasonic echo processing in presence of Doppler shift
JP7230619B2 (ja) * 2019-03-20 2023-03-01 株式会社アイシン 物体検出装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006032542A1 (de) * 2006-07-13 2008-01-17 Robert Bosch Gmbh Verfahren zur Abstandsmessung und Ultraschallabstandssensor
DE102011109830A1 (de) * 2011-08-09 2013-02-14 Valeo Schalter Und Sensoren Gmbh Verfahren zum Bestimmen der Herkunft eines von einem Ultraschallsensor eines Kraftfahrzeugs empfangenen Empfangssignals, Fahrerassistenzeinrichtung und Kraftfahrzeug

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2511521B2 (ja) * 1989-04-28 1996-06-26 日産自動車株式会社 超音波ドップラ方式対地車速計
JP2679533B2 (ja) * 1992-05-13 1997-11-19 トヨタ自動車株式会社 ドップラ式対地車速検出装置
DE102011109915B4 (de) 2011-08-10 2023-09-21 Valeo Schalter Und Sensoren Gmbh Verfahren zum Bestimmen der Herkunft eines von einem Ultraschallsensor eines Kraftfahrzeugs empfangenen Empfangssignals, Fahererassistenzeinrichtung und Kraftfahrzeug

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006032542A1 (de) * 2006-07-13 2008-01-17 Robert Bosch Gmbh Verfahren zur Abstandsmessung und Ultraschallabstandssensor
DE102011109830A1 (de) * 2011-08-09 2013-02-14 Valeo Schalter Und Sensoren Gmbh Verfahren zum Bestimmen der Herkunft eines von einem Ultraschallsensor eines Kraftfahrzeugs empfangenen Empfangssignals, Fahrerassistenzeinrichtung und Kraftfahrzeug

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2015039805A1 *

Also Published As

Publication number Publication date
DE102013015411A1 (de) 2015-03-19
WO2015039805A1 (fr) 2015-03-26

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