WO2019063344A1 - Procédé permettant de faire fonctionner un dispositif de détection par ultrasons pour un véhicule automobile, par détermination d'un état d'un élément transducteur acoustique, dispositif de détection par ultrasons, système d'aide à la conduite et véhicule automobile - Google Patents

Procédé permettant de faire fonctionner un dispositif de détection par ultrasons pour un véhicule automobile, par détermination d'un état d'un élément transducteur acoustique, dispositif de détection par ultrasons, système d'aide à la conduite et véhicule automobile Download PDF

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Publication number
WO2019063344A1
WO2019063344A1 PCT/EP2018/075127 EP2018075127W WO2019063344A1 WO 2019063344 A1 WO2019063344 A1 WO 2019063344A1 EP 2018075127 W EP2018075127 W EP 2018075127W WO 2019063344 A1 WO2019063344 A1 WO 2019063344A1
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WO
WIPO (PCT)
Prior art keywords
transducer element
sound transducer
motor vehicle
determined
ultrasonic sensor
Prior art date
Application number
PCT/EP2018/075127
Other languages
German (de)
English (en)
Inventor
Bastian Hafner
Fabian Haag
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 WO2019063344A1 publication Critical patent/WO2019063344A1/fr

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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
    • 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
    • G01S7/52004—Means for monitoring or calibrating
    • 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
    • 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
    • G01S7/52004—Means for monitoring or calibrating
    • G01S2007/52007—Means for monitoring or calibrating involving adjustment of transmitted power
    • 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
    • G01S7/52004—Means for monitoring or calibrating
    • G01S7/52006—Means for monitoring or calibrating with provision for compensating the effects of temperature

Definitions

  • the present invention relates to a method for operating a
  • Ultrasonic sensor device for a motor vehicle, in which a sound transducer element of an ultrasonic sensor for emitting an ultrasonic signal with a
  • Excitation signal is excited, the excitation signal by means of a
  • Sensor electronics by providing an electrical voltage and generating an electrical current is provided, and a state of the sound transducer element is determined based on the excitation signal.
  • the present invention relates to an ultrasonic sensor device and a driver assistance system.
  • the present invention relates to a motor vehicle.
  • Such ultrasonic sensor devices can be used, for example, to detect an object in a surrounding area of the motor vehicle.
  • an ultrasonic sensor device at least usually an ultrasonic sensor, with which a distance to the object can be determined.
  • the ultrasonic sensor usually comprises a membrane which can be excited to emit an ultrasonic signal with a corresponding sound transducer element to mechanical vibrations.
  • the ultrasonic signal emitted by the ultrasonic sensor is then reflected by the object and impinges again on the membrane of the ultrasonic sensor.
  • the membrane is excited to mechanical vibrations.
  • These vibrations can then be detected with the sound transducer element and provided in the form of a sensor signal, for example an electrical voltage.
  • ultrasound sensors in particular of the sound transducer element, are usually not detected at all.
  • DE 10 2014 107 304 A1 describes an ultrasonic sensor for a
  • Motor vehicle with a transmitting device for emitting ultrasonic waves and with a memory device in which at least one operating parameter of the
  • Ultrasonic sensor is stored.
  • at least one resonance value is stored in the memory device as the at least one operating parameter of the ultrasound sensor, which resonance frequency of a transmitting device of the
  • DE 10 2014 1 15 000 A1 describes a method for operating an ultrasonic sensor device of a motor vehicle. This is in a measuring operation for detecting an object in an environmental region of the motor vehicle
  • Transducer of an ultrasonic sensor for emitting an ultrasonic signal by means of a transmission stage with a transmission signal excited.
  • Transducer of an ultrasonic sensor for emitting an ultrasonic signal by means of a transmission stage with a transmission signal excited.
  • Receiving stage provided based on a signal generated by the transducer, a measuring signal, wherein during the measuring operation by means of a diagnostic device, a functionality of the ultrasonic sensor device is checked on the basis of the transmission signal and / or the measurement signal.
  • Sound transducer element of the ultrasonic sensor device can be checked in a simple and reliable manner.
  • This object is achieved by a method by a
  • Ultrasonic sensor device by a driver assistance system and by a
  • Ultrasonic sensor device for a motor vehicle is preferred
  • Sound transducer element of an ultrasonic sensor for emitting an ultrasonic signal with an excitation signal excited.
  • the Excitation signal is provided by means of a sensor electronics by predetermining an electrical voltage and generating an electric current.
  • a state of the sound transducer element is determined on the basis of the excitation signal.
  • the maximum electric current of the current which can be generated when the ultrasound signal is emitted at the predetermined electrical voltage is determined by means of the sensor electronics.
  • the state of the sound transducer element is preferably determined on the basis of the maximum electrical current that can be generated by the sensor electronics.
  • An inventive method is used to operate an ultrasonic sensor device for a motor vehicle.
  • a sound transducer element of an ultrasonic sensor for emitting an ultrasonic signal is excited with an excitation signal, wherein the excitation signal is provided by means of a sensor electronics by predetermining an electrical voltage and by generating an electric current. Furthermore, a state of the sound transducer element is determined on the basis of the excitation signal.
  • the maximum electric current of the current which can be generated when the ultrasound signal is emitted at the predetermined electrical voltage is determined by the sensor electronics, and the condition of the sound transducer element is determined on the basis of the maximum electric current that can be generated by the sensor electronics.
  • the ultrasonic sensor device of the motor vehicle is to be operated.
  • This ultrasonic sensor device comprises the ultrasonic sensor, which in turn has a diaphragm and the sound transducer element.
  • the membrane may for example be cup-shaped and made of a metal, in particular
  • the sound transducer element is connected to the membrane. To send out the ultrasonic signal, the sound transducer element with the
  • the excitation signal excited by the sensor electronics.
  • the excitation signal is defined by its electrical voltage, its electrical current and its frequency. Furthermore, the excitation signal can be defined by the phase relationship between the electrical current strength and the electrical voltage.
  • Excitation signal can also be defined by the multiple frequencies or a frequency range.
  • the excitation signal may in particular be a time-varying signal or an alternating signal.
  • the sound transducer element is thus used both for emitting the ultrasonic signal and for receiving the echo of the ultrasonic signal.
  • Sound transducer element may be an electroacoustic transducer.
  • the sound transducer element comprises a piezoelectric element.
  • the sound transducer element is an electromagnetic element, an electrostatic element, an electrodynamic element, a
  • the excitation signal can be provided and transmitted to the sound transducer element.
  • the electrical voltage is specified by means of the sensor electronics and the electric current is generated or provided.
  • This sensor electronics can also be used to appropriately evaluate the sensor signal provided by the sound transducer element.
  • the sensor electronics can be provided in the form of an integrated circuit or an application-specific integrated circuit.
  • the maximum current that can be generated when the ultrasound signal is emitted by the sensor electronics is determined. So it will be the electric
  • the electric current can be a
  • the maximum electric current that can be generated may describe a peak value or an effective value of the electric current.
  • the maximum electrical current that can be generated by the sensor electronics is determined at the predetermined electrical voltage.
  • this maximum electric current that can be generated describes a maximum value of the electrical current that is transmitted from the sensor electronics to the sound transducer element when the ultrasonic signal is emitted.
  • the maximum electric current that can be generated describes the maximum electric current that can be set at the given electrical voltage or input voltage and load. The load is provided by the sound transducer element.
  • Sensor electronics may have a diagnostic unit, by means of which the maximum producible electrical current can be determined. In other words, therefore, the maximum current that can be driven by the sensor electronics can be determined. On the basis of the maximum generatable electric current can then be deduced the state of the transducer element. The condition of the
  • the state may also describe changes in the sound transducer element that are caused internally or externally. These changes can be caused by a change in temperature, aging effects or soiling on the ultrasonic sensor itself.
  • Changes in state or changes in the sound transducer element can be determined on the basis of the maximum drivable electric current or the maximum electric current that can be generated. This can be determined with the evaluation device or the diagnostic unit of the evaluation device during operation of the ultrasonic sensor device or during the transmission of the ultrasonic signal.
  • a self-characterization can be carried out by the online determination of the maximum current that can be generated by the sensor electronics.
  • a change in the sound transducer element can be detected and quantified inside the sensor.
  • a possible failure of the sound transducer element can be detected early. In this way, the state of the sound transducer element and / or the ultrasonic sensor can be checked in a simple and reliable manner.
  • the electronic current intensity of the excitation signal for determining the maximum electrical current that can be generated by the sensor electronics is preferably increased continuously. It is therefore intended to continuously increase the electrical current during the transmission process or the transmission of the ultrasonic signal until the required current is no longer to be driven by the sensor electronics or the electronic control. This value is then used as a measure which characterizes the sound transducer element at the given frequency and the applied electrical voltage. By comparing this measure with a stored value, the state of the sound transducer element or of the ultrasound sensor can be determined.
  • Excitation signal controlled by a control unit of the sensor electronics and the maximum generated by the sensor electronics electric current is determined based on a control deviation of the controller unit.
  • the Sensor electronics have a control unit, by means of which the electrical
  • Amperage of the excitation signal can be controlled to a desired value.
  • This regulator unit can be designed as a current regulator. By the electric current strength of the excitation signal in particular the sound level of the emitted
  • the maximum electrical current that can be generated by the sensor electronics can be determined therefrom.
  • the control deviation describes a difference between the desired value and an actual value of the current, which in turn describes the current current generated by the sensor electronics. This allows a simple and reliable determination of the maximum generated by the sensor electronics
  • an impedance of the sound transducer element is determined based on the maximum electrical current that can be generated by the sensor electronics, and the condition of the sound transducer element is determined on the basis of the impedance.
  • the sound transducer element is preferably a piezoelectric element.
  • Change transducer element This can be detected by determining the maximum electric current that can be generated. Thus, a change in the state of the sound transducer element can be detected within a short time.
  • the electrical voltage and / or the frequency of the excitation signal are constant when determining the maximum electric current that can be generated by the sensor electronics. It can therefore be provided that a defined electrical voltage is applied to the sound transducer element and the excitation signal is provided with a fixed drive frequency.
  • the reference values for the maximum producible electrical current strength can be determined, which describe the functional or non-aged state of the sound transducer element. Furthermore, it can be provided that the reference measurements at defined
  • Temperatures are carried out. Thus it can be determined how the maximum producible electric current as a function of the temperature changed. For example, respective reference values for the maximum producible electrical current intensity can be stored for different temperatures. By comparing the maximum electric current that can be generated with these reference values, the current temperature of the sound transducer element can then be determined in a simple and reliable manner.
  • the maximum electrical current that can be generated by the sensor electronics is determined for different frequencies and / or different electrical voltages of the excitation signal.
  • the method can therefore not only be performed with a drive frequency, but it can also be varied, the frequency.
  • this method is not only performed with a drive voltage, but it is additionally the predetermined voltage varies.
  • a current temperature of the sound transducer element and / or an aging of the sound transducer element are determined as the state of the sound transducer element.
  • a current temperature of the sound transducer element and / or an aging of the sound transducer element are determined as the state of the sound transducer element.
  • Amperage the current temperature of the transducer element can be determined. On the basis of the current temperature of the sound transducer element can on the temperature of the air in the vicinity of the sound transducer element or the
  • Ultrasonic sensor are inferred. This takes into account that the
  • Temperature of the air has a significant effect on the attenuation of the transmitted over the air ultrasonic signal. Now, if the temperature of the air in the vicinity of the ultrasonic sensor is accurately determined, this can be done by emitting the
  • a method in which the temperature in the vicinity of the ultrasonic sensor is determined on the basis of measured values of temperature sensors of the motor vehicle a higher accuracy can be achieved here.
  • the maximum electric current that can be generated which takes place continuously over a predetermined, longer period of time, the aging state of the sound transducer element can be detected. If the maximum producible electrical current changes relatively rapidly as a function of time, it can be assumed that the
  • the drive signal is adjusted based on the specific state of the sound transducer element. Based on the maximum electric current that can be generated, the current state of the sound transducer element can be determined. On this basis, further measures can then be initiated.
  • the drive signal can be adjusted or varied by the drive signal depending on the current state of the sound transducer element or the ultrasonic sensor.
  • Control signal to be modified It can further be provided that an error signal is sent out if it is detected that the state of the
  • Sound transducer element is faulty or that the sound transducer element is not functional.
  • This error signal can preferably be transmitted by the ultrasonic sensor device to a higher-level system, for example an electronic control unit.
  • a higher-level system for example an electronic control unit.
  • the control unit which may be part of a driver assistance system, for example, information that the ultrasonic sensor or the ultrasonic sensor device is currently not functional.
  • An inventive ultrasonic sensor device for a motor vehicle comprises an ultrasonic sensor and a sensor electronics.
  • the ultrasonic sensor device for carrying out a method according to the invention and the advantageous
  • the ultrasonic sensor can have a diaphragm and the sound transducer element.
  • the sensor electronics can have a diaphragm and the sound transducer element.
  • the ultrasonic sensor device may be designed in particular as an application-specific integrated circuit (ASIC - application-specific integrated circuit).
  • the sensor electronics may have the regulator unit for regulating the electrical current and the diagnostic unit for determining the maximum electric current that can be generated.
  • the regulator unit for regulating the electrical current
  • the diagnostic unit for determining the maximum electric current that can be generated.
  • Sensor electronics may be arranged in a housing of the ultrasonic sensor.
  • An inventive driver assistance system for a motor vehicle comprises an ultrasonic sensor device according to the invention. In addition, that can
  • Driver assistance system having an electronic control unit.
  • Ultrasonic sensor device and the control unit can be connected via a corresponding data line for signal transmission.
  • objects can be detected in an environmental region of the motor vehicle with the aid of the driver assistance system. If it is detected that a collision between the motor vehicle and the object threatens, a corresponding warning can be output to the driver of the motor vehicle.
  • the driver assistance system maneuvers the motor vehicle at least semi-autonomously as a function of the relative position between the motor vehicle and the object. For example, that can
  • Driver assistance system be designed as a parking aid system.
  • a motor vehicle according to the invention comprises an inventive
  • the motor vehicle is designed in particular as a passenger car. It can also be provided that the motor vehicle is designed as a commercial vehicle.
  • Embodiments and their advantages apply correspondingly for the ultrasonic sensor device according to the invention, the driver assistance system according to the invention and for the motor vehicle according to the invention.
  • FIG. 1 shows a motor vehicle according to an embodiment of the invention, which is a driver assistance system with a plurality of
  • FIG. 2 is a schematic representation of an ultrasonic sensor device which has an ultrasonic sensor and a sensor electronics.
  • Fig. 1 shows a motor vehicle 1 according to an embodiment of the invention in a plan view.
  • the motor vehicle 1 is presently designed as a passenger car.
  • the motor vehicle 1 comprises a driver assistance system 2, which serves to assist a driver when driving the motor vehicle 1.
  • that can be any driver assistance system 2 which serves to assist a driver when driving the motor vehicle 1.
  • Driver assistance system 2 may be formed as a parking aid system, by means of which the driver when parking the motor vehicle in a parking space and / or when parking out of the parking space can be supported.
  • the driver assistance system 2 in turn comprises a sensor arrangement 3. Die
  • Sensor arrangement 3 has at least one ultrasonic sensor device 4. In the present embodiment, the sensor arrangement 3 comprises twelve
  • Ultrasonic sensor devices 4 In this case, six ultrasound sensor devices 4 are arranged in a front region 6 of the motor vehicle 1 and six ultrasound sensor devices 4 in a rear region 7 of the motor vehicle 1.
  • Ultrasonic sensor devices 4 can in particular on the bumpers of
  • the ultrasonic sensor devices 4 at least partially in corresponding recesses or
  • the ultrasonic sensor devices 4 are arranged hidden behind the bumpers.
  • the ultrasonic sensor devices 4 can also be arranged on further trim parts or components of the motor vehicle 1.
  • the ultrasonic sensor devices 4 may be arranged on or hidden behind the doors of the motor vehicle 1.
  • an ultrasound signal can be emitted with each of the ultrasound sensor devices 4. Following this, the ultrasound signal reflected by the object 8 can be received again. Based on the transit time between the emission of the ultrasound signal and the reception of the ultrasound signal reflected by the object 8, a distance between the ultrasound sensor device 4 and the object 8 can then be determined.
  • the driver assistance system 2 comprises an electronic control unit 5, which is connected to the ultrasonic sensor devices 4 for data transmission.
  • a corresponding data line is presently not shown for the sake of clarity.
  • the control unit 5 Based on the sensor signals, which are transmitted from the ultrasonic sensor devices 4 to the control unit 5, the control unit 5 can check whether the object 8 is located in the surrounding area and in which position the object 8 is located in the surrounding area. This information can then be from the
  • Driver assistance system 2 can be used to issue an output to the driver of
  • Driver assistance system 2 in a steering, a braking system and / or a
  • Drive motor engages to at least semi-autonomously maneuver the motor vehicle 1 in response to the at least one detected object 8.
  • FIG. 2 shows a schematic representation of an ultrasonic sensor device 4.
  • the ultrasonic sensor device 4 comprises an ultrasonic sensor 10, which in turn has a diaphragm 11 and a sound transducer element 12.
  • the membrane 1 1 may be cup-shaped and formed of a metal.
  • Sound transducer element 12 is coupled to the diaphragm 1 1 for vibration transmission.
  • the sound transducer element 12 may be an electro-acoustic energy converter, such as a mechanical-inductive, a mechanical capacitive, a mechanical-resistive, a magnetostrictive or a act electrostrictive transducer.
  • Ultrasonic sensor device 4 a sensor electronics 13 and a
  • the sensor electronics 13 is electrically connected via corresponding lines 14 to the sound transducer element 12.
  • the sensor electronics 13 is connected to the electronic control unit 5 for data transmission. In this way, it can receive corresponding control signals from the controller 5. Furthermore, the sensor signals can be transmitted from the sensor electronics 13 to the electronic control unit 5.
  • the sensor electronics 13 comprises a regulator unit 15, by means of which a
  • Excitation signal A can be provided and transmitted to the sound transducer element.
  • This excitation signal A is transmitted to the transducer element 12 in order to set this in mechanical vibrations, which are then transmitted to the membrane 1 1.
  • the ultrasonic signal can be sent out.
  • This excitation signal A is by an electrical voltage, in particular an AC voltage, by an electric current, in particular a
  • Frequency of the excitation signal A may correspond to a resonant frequency of the diaphragm 12 and be about 50 kHz.
  • the regulator unit 15 is designed as a current regulator and serves to regulate an electrical current intensity of the excitation signal A to a predetermined desired value.
  • the sensor electronics 13 comprises a diagnostic unit 16, by means of which a state of the ultrasonic sensor 10 or of the sound transducer element 12 can be determined.
  • a diagnostic unit 16 by means of which a state of the ultrasonic sensor 10 or of the sound transducer element 12 can be determined.
  • Sensor electronics 13 maximum producible electrical current Im to be determined.
  • the maximum producible electrical current Im can be determined by a control deviation of the control unit 15.
  • the diagnostic unit 16 By means of the diagnostic unit 16, therefore, the maximum drivable by means of the sensor electronics 13 electrical current at a constant voltage and a constant frequency can be determined.
  • the electrical current strength of the excitation signal A can be increased continuously, as long as the electrical current is no longer to be driven by the regulator unit 15.
  • This value can then be compared with stored nominal values in order to determine the current state of the sound transducer element 12 or of the ultrasound sensor 10. This takes into account that due to internal and / or external Actions can change an impedance of the sound transducer element 12. This change in the impedance can be determined on the basis of the maximum drivable or maximum electrical current intensity Im that can be generated by means of the sensor electronics 13.
  • the maximum current intensity Im can be determined at a constant electrical voltage and a constant frequency. It can also be provided that the frequency of the excitation signal A is varied. Alternatively or additionally, the electrical voltage of the excitation signal A can also be varied.
  • the maximum producible electric current Im can be determined at a constant electrical voltage and a constant frequency. It can also be provided that the frequency of the excitation signal A is varied. Alternatively or additionally, the electrical voltage of the excitation signal A can also be varied.
  • the maximum producible electric current Im can be determined at a constant electrical voltage and a constant frequency. It can also be provided that the frequency of the excitation signal A is varied. Alternatively or additionally, the electrical voltage of the excitation signal A can also be varied.
  • the maximum producible electric current Im can be determined at a constant electrical voltage and a constant frequency. It can also be provided that the frequency of the excitation signal A is varied. Alternatively or additionally, the electrical voltage of the excitation signal A can also be varied.
  • the maximum producible electric current Im can be determined at a constant electrical voltage
  • predetermined reference values are compared. These predetermined reference values can be recorded, for example, at different ambient temperatures.
  • the actual temperature in the surrounding area 9 or in the surroundings of the ultrasonic sensor device 4 can be determined on the basis of the maximum producible electric current intensity Im. Furthermore, based on the change in the maximum producible electric current Im an aging of the
  • Sound transducer element 12 are detected.
  • a contamination of the membrane 1 1 of the ultrasonic sensor 10 is detected on the basis of the change in the maximum producible electric current Im.
  • Contamination can occur, for example, when dirt, ice and / or snow are deposited on the membrane 11.
  • the ultrasonic sensor device 4 which comprises the ultrasonic sensor 10 and the sensor electronics 13 or the electronics
  • a self-characterization can be performed. This can be achieved by determining the maximum producible electric current intensity Im inside the sensor. In this way, the functionality of the sound transducer element 12 and the ultrasonic sensor 10 can be detected. If it is detected that the ultrasonic sensor 10 or the sound transducer element 12 is currently not functional, a corresponding error signal can be transmitted from the sensor electronics 13 to the control unit 5. Thus, within the control unit 5 is the information that, for example, one of the ultrasonic sensor devices 4 is currently defective

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  • 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 dispositif de détection par ultrasons (4) pour un véhicule automobile (1), selon lequel un élément transducteur acoustique (12) d'un capteur ultrasonore (10) est activé par un signal d'activation (A) pour émettre un signal ultrasonore, le signal d'activation (A) étant délivré au moyen d'une électronique de détection (13) par spécification d'une tension électrique et génération d'un courant électrique, et un état de l'élément transducteur acoustique (12) étant déterminé au moyen du signal d'activation (A). L'intensité maximale (Im) du courant électrique pouvant être générée lors de l'émission du signal ultrasonore à la tension électrique spécifiée est déterminée au moyen de l'électronique de détection (13), et l'état de l'élément transducteur acoustique (12) est déterminé sur la base de l'intensité maximale (Im) du courant électrique pouvant être générée par l'électronique de détection (13).
PCT/EP2018/075127 2017-09-27 2018-09-18 Procédé permettant de faire fonctionner un dispositif de détection par ultrasons pour un véhicule automobile, par détermination d'un état d'un élément transducteur acoustique, dispositif de détection par ultrasons, système d'aide à la conduite et véhicule automobile WO2019063344A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017122383.5 2017-09-27
DE102017122383.5A DE102017122383B4 (de) 2017-09-27 2017-09-27 Verfahren zum Betreiben einer Ultraschallsensorvorrichtung für ein Kraftfahrzeug mit Bestimmung eines Zustands eines Schallwandlerelements, Ultraschallsensorvorrichtung, Fahrerassistenzsystem sowie Kraftfahrzeug

Publications (1)

Publication Number Publication Date
WO2019063344A1 true WO2019063344A1 (fr) 2019-04-04

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DE102018124024A1 (de) 2018-09-28 2020-04-02 Valeo Schalter Und Sensoren Gmbh Verfahren zum Betreiben eines Ultraschallsensors eines Fahrzeugs mit reduzierter Diagnose in einem Messbetrieb des Ultraschallsensors sowie Ultraschallsensorvorrichtung

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