EP1373927A1 - Radar sensor platform - Google Patents

Radar sensor platform

Info

Publication number
EP1373927A1
EP1373927A1 EP02729800A EP02729800A EP1373927A1 EP 1373927 A1 EP1373927 A1 EP 1373927A1 EP 02729800 A EP02729800 A EP 02729800A EP 02729800 A EP02729800 A EP 02729800A EP 1373927 A1 EP1373927 A1 EP 1373927A1
Authority
EP
European Patent Office
Prior art keywords
parking space
radar sensor
sensor platform
vehicle
processor
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.)
Ceased
Application number
EP02729800A
Other languages
German (de)
French (fr)
Inventor
Bernhard Mattes
Rainer Moritz
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 EP1373927A1 publication Critical patent/EP1373927A1/en
Ceased 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/87—Combinations of radar systems, e.g. primary radar and secondary radar
    • 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T2201/00—Particular use of vehicle brake systems; Special systems using also the brakes; Special software modules within the brake system controller
    • B60T2201/10—Automatic or semi-automatic parking aid 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9314—Parking operations
    • 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9315—Monitoring blind spots
    • 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9317—Driving backwards
    • 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9327—Sensor installation details
    • G01S2013/93271—Sensor installation details in the front of the 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9327—Sensor installation details
    • G01S2013/93272—Sensor installation details in the back of the 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9327—Sensor installation details
    • G01S2013/93275—Sensor installation details in the bumper area
    • 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
    • G01S2015/932—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations
    • G01S2015/933—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations for measuring the dimensions of the parking space when driving past
    • G01S2015/936—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles for parking operations for measuring the dimensions of the parking space when driving past for measuring parking spaces extending transverse or diagonal to the driving direction, i.e. not parallel to the driving direction

Definitions

  • the invention is based on a radar sensor platform according to the type of the independent claim.
  • the radar sensor platform according to the invention with the features of the independent claim has the advantage that the minimum width of a parking bay or parking space is measured precisely. This measurement result is displayed digitally to the driver. This advantageously eliminates subjective width estimation errors from parking spaces. Acoustic and / or visual warning signals can inform a driver instead of a direct display whether the parking space is for him suitable is. The intensity of the warning may increase as parking spaces become narrower.
  • the horizontal opening angle which is used for the parking space width measurement, is at least 170 p . This ensures that an exact measurement of the parking space is made possible.
  • a vehicle-specific threshold value for the parking space in width can be stored in the memory, which can be connected to the processor, and this threshold value with the measured width of the parking space, the output by means of the acoustic and / or optical output certainly.
  • the measured parking space width is shown on a display, so that a driver can use this information directly.
  • This can advantageously be expanded by also displaying the gaps next to the vehicle.
  • the acoustic and optical outputs are controlled by the processor in such a way that centered parking is possible. This can be expanded by ensuring that optimal use of the parking space is ensured by specifying distances to be observed from the neighboring vehicles.
  • the radar sensor platform at least in the front or in the vehicle The rear of the vehicle is installed, so that the radar sensor platform works optimally.
  • FIG. 1 schematically shows a parking situation
  • FIG. 2 shows a block diagram of the radar sensor platform according to the invention
  • FIG. 3 shows a flow diagram of a method according to the invention.
  • a radar sensor platform which is used for measuring the distance of a parking space from a vehicle.
  • four radar sensors are used here, the outer radar sensors in particular being used to increase the horizontal opening angle to at least 170 °. This is particularly advantageous for measuring the parking spaces.
  • the radar sensor used here works at a frequency of 24 gigahertz, which is particularly suitable for short-range selection, since this frequency has a high level of attenuation in the atmosphere. These radar sensors are therefore also referred to as short range radar sensors.
  • the vertical opening angle of these radar sensors is here, as is usually the case, 20 °. Usually, for example for the pre-crash sensor technology uses a horizontal opening angle of 140 °.
  • FIG. 1 shows schematically a parking situation.
  • a driver of a vehicle which has four radar sensors 6 on the front of the vehicle, wants to park and has chosen the parking space 2 for this purpose.
  • Parking space 2 is located between the parked vehicles 3 and 4.
  • the radar sensors 6 are oriented such that they cover a horizontal opening angle of 170 °, which is indicated by the dashed lines.
  • the dashed lines are delimited by an arc that defines the range of the radar sensors.
  • a processor in the vehicle 1 Based on the measurement of the radar sensors 6, a processor in the vehicle 1 recognizes that the parking space 2 is too narrow. Therefore, the vehicle 1 cannot park here. Valuable time is saved and a parking attempt that may result in damage is not initiated at all.
  • the opening angle which is normally 140 ° for the pre-crash sensor system, can be increased to 170 ° in particular by means of an electronic setting.
  • FIG. 2 shows a block diagram of the radar sensor platform according to the invention with connected devices.
  • a radar sensor platform 27 has four radar sensors 6, to which control modules 7, 8, 9 and 10 are connected. These control modules 7, 8, 9 and 10 provide both electrical and electromechanical control.
  • the electromechanical control applies in particular to changing the horizontal opening angle.
  • the electrical control includes the provision of the microwave len, which are required for radar sensing, and also the reception of the microwaves reflected by the obstacle.
  • the control modules 7, 8, 9 and 10 are connected to a first, second, third and fourth data input / output of a processor 11 via respective data inputs / outputs.
  • a bus connection is also possible here.
  • the processor 11 is connected via a fifth data input / output to a memory 12, which is used for the temporary storage of results, but also as a permanent memory for threshold values.
  • the processor 11 is connected via a first data output to a control 13 which is connected to an input of a display 14.
  • the processor 11 is connected via a second data output to an audio control 15, which is connected to an input of a loudspeaker 16.
  • the control 13 ensures that data coming from the processor 11 are correspondingly shown on a display 14.
  • the audio control 15 converts the signals from the processor into analog audio signals, amplifies them and then uses the
  • Loudspeaker 16 for acoustic reproduction The processor 11 is connected via a data input to a signal processing unit 28, to which an input device 29 / " is in turn connected.
  • the input device 29 is / in the passenger compartment of the vehicle 1 and via this input device 29 a driver indicates that he is measuring a parking space This is then forwarded to the processor 11 via the signal processing 28.
  • buttons or a voice control can serve as the input device 29.
  • the processor 11 controls the radar sensors 6 via the controls 7, 8, 9 and 10, in order to possibly adjust the horizon when parking space is measured. len opening angle of the radar sensors 6 to increase.
  • the processor 11 outputs signals to the driver via the display 14 and the loudspeaker 16.
  • the pulse radar method is used here as the measuring principle. However, a Doppler method is also possible. The pulse radar method measures the time that has elapsed between a transmitted pulse and its return after a reflection on the object. The distance to the object can then be determined from this. More than four radar sensors 6 are also possible, which may improve the resolution. If the processor 11 has determined the parking space which the radar sensors 6 have measured, the processor 11 can use this to determine the distance to the vehicles 3 and 4. This results in a width of the parking space that is smaller than the vehicle width of the vehicle 1 that the
  • Processor 11 recognizes by a comparison with a vehicle-specific threshold value stored in the memory 12, then the driver is warned via the loudspeaker 16 and the display 14 that parking is not possible here. However, if the parking space is wide enough, the driver can use the input device 29 to choose to park in the center. The processor 11 then helps him by measuring with the radar sensors 6 and output via the loudspeaker 16 and the display 14 by the processor 11 using appropriate optical and acoustic signals
  • Driver indicates that he always stays in the middle between vehicles 3 and 4. This creates a control loop in which the driver is the signal box and the radar sensor platform is the measuring unit.
  • FIG. 3 shows a flow diagram of the method according to the invention.
  • a driver switches on the parking space width measurement with the input device 29.
  • the processor 11 sets the radar sensors 6 to a wider horizontal opening angle of 170 °, and the processor 11 loads the algorithm for parking space measurement.
  • This algorithm is located in the memory 12.
  • the corresponding vehicle-specific threshold values which indicate the parking space into which the vehicle 1 can still park.
  • the distances are measured by the radar sensors 6 and the evaluation of the radar sensor signals by the processor 11. The distances in the parking space are then known.
  • step 20 the width of the parking space is then determined.
  • this width is compared with the minimum width for parking with the vehicle 1 with the vehicle-specific threshold value. If the width is greater than this threshold value, then method step 23 continues with the display that the vehicle 1 can be parked in the parking space 2. This also includes minimum distances of, for example, 0.5 meters to vehicles 3 and 4 parked to the side. However, if the parking space is too narrow, then it is indicated in method step 22 that the parking space 2 is not for the
  • Parking with vehicle 1 is suitable. It is possible to enter a number that allows the driver to still try to park if the vehicle fits and the side distances to vehicles 3 and 4 decrease below half a meter.
  • method step 24 when parking is indicated as possible in method step 21, a query is made as to whether the driver wishes to have centered parking. He then inputs this using the input device 29, with the driver then in method step 25 using the loudspeaker 16 and the display 14 is helped to park centered in the parking space. If the driver does not want centered parking, then this function is not used in method step 26. The driver is then warned when parking by minimal distances to vehicles 3 and 4.

Abstract

The invention relates to a radar sensor platform, which comprises at least four radar sensors and which, while installed in a vehicle, is provided for measuring distances. According to the invention, a driver uses an input device to request a measurement of a parking space. The four radar sensors then enlarge their horizontal beam angle, and the means, which are provided for acoustically and/or optically outputting, output a signal according to the measurement of the parking space width. This signal is, for example, the parking space width or a warning. The horizontal beam angle for the parking space measurement is equal to at least 170 DEG . The lateral distances of the vehicle in the parking space can also be indicated. In addition, the acoustic and optical aids enable a centered parking. The radar sensor platform is advantageously installed either in the front-end and/or rear-end of the vehicle.

Description

RadarsensorplattformRadar sensor platform
Stand der TechnikState of the art
Die Erfindung geht aus von einer Radarsensorplattform nach der Gattung des unabhängigen Patentanspruchs.The invention is based on a radar sensor platform according to the type of the independent claim.
Es ist bereits bekannt, eine 24 Gigahertz-Pulsradar- Sensorplattform für die Erfassung von Objekten in kurzer Entfernung einzusetzen, die für eine Precrash Sensierung, eine Einparkhilfe für das automatische Abstandsradar, für eine tote Winkelerkennung und für eine Fußgängererkennung sowie für eine Parklückenvermessung beim seitlichen Vorbeifahren ausgelegt sein kann.It is already known to use a 24 gigahertz pulse radar sensor platform for the detection of objects at a short distance, which is used for a pre-crash detection, a parking aid for the automatic distance radar, for a blind spot detection and for a pedestrian detection as well as for a parking space measurement when driving past on the side can be designed.
Vorteile der ErfindungAdvantages of the invention
Die erfindungsgemäße Radarsensorplattform mit den Merkmalen des unabhängigen Patentanspruchs hat demgegenüber den Vorteil, dass die Mindestbreite einer Parkbucht bzw. Parklücke genau vermessen wird. Dieses Meßergebnis wird dem Fahrer digital angezeigt. Somit entfallen vorteilhafterweise subjektive Breitenschätzungsfehler von Parklücken. Akustische und/oder optische Warnsignale können statt einer direkten Anzeige einen Fahrer informieren, ob die Parklücke für ihn geeignet ist. Dabei kann sich bei einer zunehmenden Parklük- kenschmalheit die Intensität der Warnung steigern.The radar sensor platform according to the invention with the features of the independent claim has the advantage that the minimum width of a parking bay or parking space is measured precisely. This measurement result is displayed digitally to the driver. This advantageously eliminates subjective width estimation errors from parking spaces. Acoustic and / or visual warning signals can inform a driver instead of a direct display whether the parking space is for him suitable is. The intensity of the warning may increase as parking spaces become narrower.
Durch die in den abhängigen Ansprüchen aufgeführten Maßnah- men und Weiterbildungen sind vorteilhafte Verbesserungen der im unabhängigen Patentanspruch angegebenen Radarsensorplattform möglich.The measures and further developments listed in the dependent claims permit advantageous improvements to the radar sensor platform specified in the independent patent claim.
Besonders vorteilhaft ist, dass der horizontale Öffnungswin- kel, der für die Parklückenbreitenvermessung verwendet wird, wenigstens 170p beträgt. Damit ist gewährleistet, dass eine exakte Vermessung der Parklücke ermöglicht wird.It is particularly advantageous that the horizontal opening angle, which is used for the parking space width measurement, is at least 170 p . This ensures that an exact measurement of the parking space is made possible.
Darüber hinaus ist es von Vorteil, dass in dem Speicher, der mit dem Prozessor verbindbar ist, ein fahrzeugspezifischer Schwellwert für die Parklücke an Breite abspeicherbar ist und dieser Schwellwert mit der gemessenen Breite der Parklücke die Ausgabe durch die Mittel der akustischen und/oder optischen Ausgabe bestimmt.In addition, it is advantageous that a vehicle-specific threshold value for the parking space in width can be stored in the memory, which can be connected to the processor, and this threshold value with the measured width of the parking space, the output by means of the acoustic and / or optical output certainly.
Weiterhin ist es von Vorteil, dass die gemessene Parklückenbreite auf einer Anzeige dargestellt wird, so dass ein Fahrer diese Information direkt verwerten kann. Dies kann vorteilhafterweise dadurch erweitert werden, dass die Lücken neben dem Fahrzeug ebenfalls angezeigt werden.It is also advantageous that the measured parking space width is shown on a display, so that a driver can use this information directly. This can advantageously be expanded by also displaying the gaps next to the vehicle.
Des weiteren ist es von Vorteil, dass die akustischen und optischen Ausgaben derart von dem Prozessor angesteuert werden, dass ein zentriertes Einparken möglich ist. Dies kann dadurch erweitert werden, dass durch Vorgabe von Abständen, die einzuhalten sind, zu den benachbarten Fahrzeugen, eine optimale Parkplatzausnutzung gewährleistet wird.Furthermore, it is advantageous that the acoustic and optical outputs are controlled by the processor in such a way that centered parking is possible. This can be expanded by ensuring that optimal use of the parking space is ensured by specifying distances to be observed from the neighboring vehicles.
Schließlich ist es auch von Vorteil, dass die Radarsensor- plattform wenigstens in der Fahrzeugvorder- oder in der Fahrzeugrückseite eingebaut ist, so dass eine optimale Wirkungsweise der Radarsensorplattform ermöglicht wird.Finally, it is also advantageous that the radar sensor platform at least in the front or in the vehicle The rear of the vehicle is installed, so that the radar sensor platform works optimally.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Es zeigt Figur 1 schematisch eine Einparksituation, Figur 2 ein Blockschaltbild der erfindungsgemäßen Radarsensorplattform und Figur 3 ein Flußdiagramm eines erfindungsgemäßen Verfahrens.Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. FIG. 1 schematically shows a parking situation, FIG. 2 shows a block diagram of the radar sensor platform according to the invention, and FIG. 3 shows a flow diagram of a method according to the invention.
Beschreibungdescription
Da das optimale Einparken aufgrund einer zunehmenden Zahl von Kraftfahrzeugen bei einer mehr oder weniger gleich bleibenden Größe der verfügbaren Parkräume ein immer schwierigeres Unterfangen wird, ist es notwendig, einem Fahrer eine automatische Hilfe beim Einparken zur Verfügung zu stellen, um den Parkvorgang sicherer und effizienter zu gestalten. Erfindungsgemäß wird eine Radarsensorplattform vorgeschlagen, die zur Äbstandsmessung einer Parklücke von einem Fahrzeug verwendet wird. Dabei werden hier insbesondere vier Radarsensoren verwendet, wobei vor allem die äußeren Radar- sensoren dazu eingesetzt werden, um den horizontalen Öffnungswinkel auf wenigstens 170° zu erhöhen. Dies ist für die Ausmessung der Parklücken besonders vorteilhaft.Since optimal parking is becoming an increasingly difficult task due to an increasing number of motor vehicles with a more or less constant size of the available parking spaces, it is necessary to provide automatic assistance to a driver in order to make the parking process safer and more efficient shape. According to the invention, a radar sensor platform is proposed which is used for measuring the distance of a parking space from a vehicle. In particular, four radar sensors are used here, the outer radar sensors in particular being used to increase the horizontal opening angle to at least 170 °. This is particularly advantageous for measuring the parking spaces.
Der hier verwendete Radarsensor arbeitet bei einer Frequenz von 24 Gigahertz, die insbesondere für die Nahbereichsele tion geeignet ist, da diese Frequenz in der Atmosphäre eine hohe Dämpfung aufweist. Diese Radarsensoren werden daher auch als Short Range Radarsensoren bezeichnet. Der vertikale Öffnungswinkel dieser Radarsensoren beträgt hier wie auch sonst üblicherweise 20°. Normalerweise, beispielsweise für die Precrash Sensorik wird ein horizontaler Öffnungswinkel von 140° verwendet.The radar sensor used here works at a frequency of 24 gigahertz, which is particularly suitable for short-range selection, since this frequency has a high level of attenuation in the atmosphere. These radar sensors are therefore also referred to as short range radar sensors. The vertical opening angle of these radar sensors is here, as is usually the case, 20 °. Usually, for example for the pre-crash sensor technology uses a horizontal opening angle of 140 °.
Figur 1 zeigt schematisch eine Einparksituation. Ein Fahrer eines Fahrzeugs 1, das vier Radarsensoren 6 auf der Fahrzeugvorderseite aufweist, möchte einparken und hat sich dazu die Parklücke 2 ausgesucht. Parklücke 2 befindet sich zwischen den parkenden Fahrzeugen 3 und 4. Die Radarsensoren 6 sind so ausgerichtet, dass sie einen horizontalen Öffnungs- winkel von 170° abdecken, der durch die gestrichelten Linien angedeutet ist. Die gestrichelten Linien sind durch einen Kreisbogen begrenzt, der die Reichweite der Radarsensoren definiert. Aufgrund der Messung der Radarsensoren 6 erkennt ein Prozessor in dem Fahrzeug 1, dass die Parklücke 2 zu schmal ist. Daher kann das Fahrzeug 1 hier nicht einparken. Wertvolle Zeit wird damit gewonnen und ein eventuell in einer Beschädigung endender Einparkversuch wird erst gar nicht initiiert.Figure 1 shows schematically a parking situation. A driver of a vehicle 1, which has four radar sensors 6 on the front of the vehicle, wants to park and has chosen the parking space 2 for this purpose. Parking space 2 is located between the parked vehicles 3 and 4. The radar sensors 6 are oriented such that they cover a horizontal opening angle of 170 °, which is indicated by the dashed lines. The dashed lines are delimited by an arc that defines the range of the radar sensors. Based on the measurement of the radar sensors 6, a processor in the vehicle 1 recognizes that the parking space 2 is too narrow. Therefore, the vehicle 1 cannot park here. Valuable time is saved and a parking attempt that may result in damage is not initiated at all.
Es ist möglich, dass nicht nur die äußeren Radarsensoren 6, sondern auch die anderen Radarsensoren 6 in der Mitte einstellbar sind. Insbesondere durch eine elektronische Einstellung kann der Öffnungswinkel, der normalerweise für die Precrash Sensorik 140° beträgt, auf 170° vergrößert werden.It is possible that not only the outer radar sensors 6, but also the other radar sensors 6 can be adjusted in the middle. The opening angle, which is normally 140 ° for the pre-crash sensor system, can be increased to 170 ° in particular by means of an electronic setting.
Figur 2 zeigt als Blockschaltbild die erfindungsgemäße Radarsensorplattform mit angeschlossenen Geräten. Eine Radarsensorplattform 27 weist vier Radarsensoren 6 auf, an die jeweils Ansteuerungsmodule 7, 8, 9 und 10 angeschlossen sind. Diese Ansteuerungsmodule 7, 8. 9 und 10 sorgen sowohl für eine elektrische als auch elektromechanische Ansteue- rung. Die elektromechanische Ansteuerung gilt insbesondere zur Veränderung des horizontalen Öffnungswinkels. Die elektrische Ansteuerung umfaßt die Bereitstellung der Mikrowel- len, die für die Radarsensierung benötigt werden, und auch den Empfang der am Hindernis reflektierten Mikrowellen.Figure 2 shows a block diagram of the radar sensor platform according to the invention with connected devices. A radar sensor platform 27 has four radar sensors 6, to which control modules 7, 8, 9 and 10 are connected. These control modules 7, 8, 9 and 10 provide both electrical and electromechanical control. The electromechanical control applies in particular to changing the horizontal opening angle. The electrical control includes the provision of the microwave len, which are required for radar sensing, and also the reception of the microwaves reflected by the obstacle.
Über jeweilige Daten-Ein/Ausgänge sind die Ansteuerungsmodu- le 7, 8, 9 und 10 mit einem ersten, zweiten, dritten und vierten Daten-Ein/Ausgang eines Prozessors 11 verbunden. Hier ist auch eine Busverbindung möglich. Über einen fünften Daten-Ein/Ausgang ist der Prozessor 11 mit einem Speicher 12 verbunden, der zur Zwischenspeicherung von Ergebnissen dient, aber auch als Permanentspeicher für Schwellwerte. Über einen ersten Datenausgang ist der Prozessor 11 mit einer Ansteuerung 13 verbunden, die an einen Eingang einer Anzeige 14 angeschlossen ist. Über einen zweiten Datenausgang ist der Prozessor 11 mit einer Audioansteuerung 15 verbunden, die an einen Eingang eines Lautsprechers 16 angeschlossen ist. Die Ansteuerung 13 sorgt dafür, dass Daten, die vom Prozessor 11 kommen, entsprechend auf einer Anzeige 14 dargestellt werden. Hier ist es der Wert 3 Meter. Die Audioansteuerung 15 setzt die Signale vom Prozessor in ana- löge Audiosignale um, verstärkt diese und nutzt dann denThe control modules 7, 8, 9 and 10 are connected to a first, second, third and fourth data input / output of a processor 11 via respective data inputs / outputs. A bus connection is also possible here. The processor 11 is connected via a fifth data input / output to a memory 12, which is used for the temporary storage of results, but also as a permanent memory for threshold values. The processor 11 is connected via a first data output to a control 13 which is connected to an input of a display 14. The processor 11 is connected via a second data output to an audio control 15, which is connected to an input of a loudspeaker 16. The control 13 ensures that data coming from the processor 11 are correspondingly shown on a display 14. Here it is worth 3 meters. The audio control 15 converts the signals from the processor into analog audio signals, amplifies them and then uses the
Lautsprecher 16 zur akustischen Wiedergabe. Über einen Dateneingang ist der Prozessor 11 mit einer Signalverarbeitung 28 verbunden, an die wiederum eine Eingabevorrichtung 29 /"angeschlossen ist. Die Eingabevorrichtung 29 befindet sich / in der Fahrgastzelle des Fahrzeugs 1 und über diese Eingabevorrichtung 29 gibt ein Fahrer an, dass er eine Parklückenvermessung durchzuführen wünscht. Dies wird dann über die Signalverarbeitung 28 an den Prozessor 11 weitergeleitet. Als Eingabevorrichtung 29 können dabei Taster oder auch eine Sprachsteuerung dienen.Loudspeaker 16 for acoustic reproduction. The processor 11 is connected via a data input to a signal processing unit 28, to which an input device 29 / " is in turn connected. The input device 29 is / in the passenger compartment of the vehicle 1 and via this input device 29 a driver indicates that he is measuring a parking space This is then forwarded to the processor 11 via the signal processing 28. In this case, buttons or a voice control can serve as the input device 29.
In Abhängigkeit von den Eingaben, die an der Eingabevorrichtung 29 vorgenommen werden, steuert der Prozessor 11 über die Ansteuerungen 7, 8, 9 und 10 die Radarsensoren 6 an, um gegebenenfalls bei einer Parklückenvermessung den horizonta- len Öffnungswinkel der Radarsensoren 6 zu erhöhen. In Abhängigkeit von den Meßsignalen gibt der Prozessor 11 über die Anzeige 14 und den Lautsprecher 16 Signale zum Fahrer aus. Als Meßprinzip wird hier das Pulsradarverfahren verwendet. Es ist jedoch auch ein Dopplerverfahren möglich. Bei dem Pulsradarverfahren wird die Zeit vermessen, die von einem abgesendeten Puls bis zu seinem Wiedereintreffen nach einer Reflexion an dem Objekt vergangen ist. Daraus ist dann die Entfernung zu dem Objekt bestimmbar. Es sind auch mehr als vier Radarsensoren 6 möglich, die gegebenenfalls die Auflösung verbessern. Hat der Prozessor 11 die Parklücke, die die Radarsensoren 6 vermessen haben, ermittelt, kann daraus der Prozessor 11 den Abstand zu den Fahrzeugen 3 und 4 bestimmen. Ergibt sich daraus eine Breite der Parklücke, die klei- ner ist als die Fahrzeugbreite des Fahrzeugs 1, das derDepending on the inputs that are made on the input device 29, the processor 11 controls the radar sensors 6 via the controls 7, 8, 9 and 10, in order to possibly adjust the horizon when parking space is measured. len opening angle of the radar sensors 6 to increase. Depending on the measurement signals, the processor 11 outputs signals to the driver via the display 14 and the loudspeaker 16. The pulse radar method is used here as the measuring principle. However, a Doppler method is also possible. The pulse radar method measures the time that has elapsed between a transmitted pulse and its return after a reflection on the object. The distance to the object can then be determined from this. More than four radar sensors 6 are also possible, which may improve the resolution. If the processor 11 has determined the parking space which the radar sensors 6 have measured, the processor 11 can use this to determine the distance to the vehicles 3 and 4. This results in a width of the parking space that is smaller than the vehicle width of the vehicle 1 that the
Prozessor 11 durch einen Vergleich mit einem fahrzeugspezifischen, im Speicher 12 abgelegten Schwellwert erkennt, dann wird der Fahrer über den Lautsprecher 16 und die Anzeige 14 gewarnt, dass hier ein Einparken nicht möglich ist. Ist jedoch die Parklücke breit genug, dann kann der Fahrer über die Eingabevorrichtung 29 wählen, dass er zentriert einparken möchte. Dabei hilft ihm dann der Prozessor 11 durch die Messung mit den Radarsensoren 6 und die Ausgabe über den Lautsprecher 16 und die Anzeige 14, indem der Prozessor 11 durch entsprechende optische und akustische Signale denProcessor 11 recognizes by a comparison with a vehicle-specific threshold value stored in the memory 12, then the driver is warned via the loudspeaker 16 and the display 14 that parking is not possible here. However, if the parking space is wide enough, the driver can use the input device 29 to choose to park in the center. The processor 11 then helps him by measuring with the radar sensors 6 and output via the loudspeaker 16 and the display 14 by the processor 11 using appropriate optical and acoustic signals
Fahrer darauf hinweist, dass er immer in der Mitte zwischen den Fahrzeugen 3 und 4 bleibt. Dadurch wird ein Regelkreis realisiert, bei dem der Fahrer das Stellwerk und die Radarsensorplattform die Meßeinheit ist.Driver indicates that he always stays in the middle between vehicles 3 and 4. This creates a control loop in which the driver is the signal box and the radar sensor platform is the measuring unit.
Dem Fahrer ist es jedoch überlassen, auch anders, also nicht zentriert, einzuparken. Dabei werden über die Anzeige 14 dem Fahrer die Seitenabstände zu den Hindernissen 3 und 4 dargestellt . In Figur 3 ist ein Flußdiagramm des erfindungsgemäßen Verfahrens dargestellt. Im Verfahrensschritt 17 schaltet ein Fahrer mit der Eingabevorrichtung 29 die Parklückenbreiten- messung ein. In Verfahrensschritt 18 erfolgt dann über den Prozessor 11 die Einstellung der Radarsensoren 6 auf einen breiteren horizontalen Öffnungswinkel von 170°, und es wird vom Prozessor 11 der Algorithmus zur Parklückenvermessung geladen. Dieser Algorithmus befindet sich im Speicher 12. Ebenso die entsprechenden fahrzeugspezifischen Schwellwerte, die angeben, in welche Parklücke das Fahrzeug 1 noch einparken kann. In Verfahrensschritt 19 erfolgt die Messung der Abstände durch die Radarsensoren 6 und die Auswertung der Radarsensorsignale durch den Prozessor 11. Damit sind dann die Abstände in der Parklücke bekannt. In Verfahrensschritt 20 wird daraus dann die Breite der Parklücke bestimmt. In Verfahrensschritt 21 wird diese Breite mit der minimalen Breite für das Einparken mit dem Fahrzeug 1 mit dem fahrzeugspezifischen Schwellwert verglichen. Ist die Breite größer als dieser Schwellwert, dann wird in Verfahrens- schritt 23 mit der Anzeige fortgefahren, dass in die Parklücke 2 mit dem Fahrzeug 1 eingeparkt werden kann. Dabei werden auch Mindestabstände von beispielsweise 0,5 Metern zu den seitlich parkenden Fahrzeugen 3 und 4 mit eingerechnet. Ist jedoch die Parklücke zu eng, dann wird in Verfahrens- schritt 22 angegeben, dass die Parklücke 2 nicht für dasHowever, it is up to the driver to park in a different way, i.e. not centered. The display shows the driver the side distances to the obstacles 3 and 4. FIG. 3 shows a flow diagram of the method according to the invention. In method step 17, a driver switches on the parking space width measurement with the input device 29. In method step 18, the processor 11 then sets the radar sensors 6 to a wider horizontal opening angle of 170 °, and the processor 11 loads the algorithm for parking space measurement. This algorithm is located in the memory 12. Likewise, the corresponding vehicle-specific threshold values which indicate the parking space into which the vehicle 1 can still park. In step 19, the distances are measured by the radar sensors 6 and the evaluation of the radar sensor signals by the processor 11. The distances in the parking space are then known. In step 20, the width of the parking space is then determined. In method step 21, this width is compared with the minimum width for parking with the vehicle 1 with the vehicle-specific threshold value. If the width is greater than this threshold value, then method step 23 continues with the display that the vehicle 1 can be parked in the parking space 2. This also includes minimum distances of, for example, 0.5 meters to vehicles 3 and 4 parked to the side. However, if the parking space is too narrow, then it is indicated in method step 22 that the parking space 2 is not for the
Parken mit dem Fahrzeug 1 geeignet ist. Eventuell wird dabei eine Zahlenangabe eingegeben, die es dem Fahrer erlaubt, eventuell dennoch einen Parkvorgang zu versuchen, falls das Fahrzeug hineinpaßt und die Seitenabstände zu den Fahrzeugen 3 und 4 unter einem halben Meter sinken. In Verfahrensschritt 24 wird dann, wenn das Parken in Verfahrensschritt 21 als möglich angezeigt wird, abgefragt, ob der Fahrer ein zentriertes Parken wünscht. Dies gibt er dann mittels der Eingabevorrichtung 29 ein, wobei dann in Verfahrensschritt 25 mit dem Lautsprecher 16 und der Anzeige 14 dem Fahrer geholfen wird, zentriert in die Parklücke einzuparken. Wünscht der Fahrer kein zentriertes Einparken, dann wird in Verfahrensschritt 26 diese Funktion nicht angewendet. Der Fahrer wird dann beim Einparken durch Minimalabstände zu den Fahrzeugen 3 und 4 gewarnt . Parking with vehicle 1 is suitable. It is possible to enter a number that allows the driver to still try to park if the vehicle fits and the side distances to vehicles 3 and 4 decrease below half a meter. In method step 24, when parking is indicated as possible in method step 21, a query is made as to whether the driver wishes to have centered parking. He then inputs this using the input device 29, with the driver then in method step 25 using the loudspeaker 16 and the display 14 is helped to park centered in the parking space. If the driver does not want centered parking, then this function is not used in method step 26. The driver is then warned when parking by minimal distances to vehicles 3 and 4.

Claims

Ansprüche Expectations
1. Radarsensorplattform (27) zur Parklückenbreitemessung in einem Fahrzeug (1), wobei die wenigstens eine Radarsensorplattform (27) mit einem Prozessor (11) verbindbar ist, wobei zur Warnung Mittel (14, 16) zur akustischen und/oder optischen Ausgabe, die von dem Prozessor (11) ansteuerbar sind, vorhanden sind, dadurch gekenn- zeichnet, dass wenigstens vier Radarsensoren (6) auf der wenigstens einen Radarsensorplattform (27) vorhanden sind, dass eine Eingabevorrichtung (29) vorhanden ist, die zur Aktivierung einer Messung einer Parklük- kenbreite mit der wenigstens einen Radarsensorplattform (27) dient, und dass dann im Falle der Aktivierung die wenigstens vier Radarsensoren (6) ihren horizontalen Öffnungswinkel vergrößern und die Mittel (14, 16) zur akustischen und/oder optischen Ausgabe in Abhängigkeit von der Messung der Parklückenbreite ein Signal abge- ben.1. Radar sensor platform (27) for parking space width measurement in a vehicle (1), wherein the at least one radar sensor platform (27) can be connected to a processor (11), with means (14, 16) for acoustic and / or optical output for warning that are controllable by the processor (11), characterized in that at least four radar sensors (6) are present on the at least one radar sensor platform (27), that an input device (29) is present which is used to activate a measurement of a Parking space width with the at least one radar sensor platform (27), and that when activated, the at least four radar sensors (6) then increase their horizontal opening angle and the means (14, 16) for acoustic and / or optical output depending on the Give a signal by measuring the parking space width.
2. Radarsensorplattform nach Anspruch 1, dadurch gekennzeichnet, dass der horizontale Öffnungswinkel wenigstens 170° beträgt.2. Radar sensor platform according to claim 1, characterized in that the horizontal opening angle is at least 170 °.
3. Radarsensorplattform nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass in einem Speicher (12) , der mit dem Prozessor (11) verbindbar ist, ein fahrzeugspezifischer Schwellwert für die Parklückenbreite abspeicher- bar ist und dass in Abhängigkeit von einem Vergleich des Schwellwerts mit der gemessenen Parklückenbreite die Mittel (14, 16) zur akustischen und/oder optischen Ausgabe das Signal ausgeben.3. Radar sensor platform according to claim 1 or 2, characterized in that a vehicle-specific threshold value for the parking space width can be stored in a memory (12) which can be connected to the processor (11) and that as a function of a comparison of the threshold value with the measured parking space width, the means (14, 16) for acoustic and / or optical output of the signal.
4. Radarsensorplattform nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Mittel zur akustischen und/oder optischen Ausgabe eine Anzeige (14) aufweisen, auf der als das Signal die gemessene Parklückenbreite angezeigt wird.4. Radar sensor platform according to one of the preceding claims, characterized in that the means for acoustic and / or optical output have a display (14) on which the measured parking space width is displayed as the signal.
5. Radarsensorplattform nach Anspruch 4, dadurch gekennzeichnet, dass die Seitenabstände des Fahrzeugs (1) in der Parklücke anzeigbar sind.5. Radar sensor platform according to claim 4, characterized in that the side distances of the vehicle (1) can be displayed in the parking space.
6. Radarsensorplattform nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Prozessor (11) so ausgebildet ist, dass der Prozessor (11) die Mittel (14, 16) zur akustischen und/oder optischen Ausgabe derart ansteuert, so dass ein zentriertes Einpar- ken möglich ist.6. Radar sensor platform according to one of the preceding claims, characterized in that the processor (11) is designed such that the processor (11) controls the means (14, 16) for acoustic and / or optical output such that a centered saving - is possible.
7. Radarsensorplattform nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die wenigstens eine Radarsensorplattform (27) in der Fahrzeugvorder- und/oder der Fahrzeugrückseite eingebaut ist. 7. Radar sensor platform according to one of the preceding claims, characterized in that the at least one radar sensor platform (27) is installed in the front and / or rear of the vehicle.
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