• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A radar device (10) for a motor vehicle (50) includes a radar antenna (12) configured to detect a reflected signal (22) characterized as a reflection of an emitted signal (20) reflected by an object (16) present in the field of vision (18) of the radar antenna (12); a controller (14) configured to transmit at least one radar signal (20) from the radar antenna (12), the radar signal (20) being transmitted in accordance with a determined object detection transmit power (16); the controller (14) being configured to detect the power level of the reflected signal (22) from the transmitted radar signal (20) reflected by the detected object (16); the controller (14) being configured to adjust the transmission power according to the power level of the reflected signal (22) detected to a minimum power sufficient for the detection of the object (16) detected.
    公开号:FR3083620A1
    申请号:FR1856202
    申请日:2018-07-05
    公开日:2020-01-10
    发明作者:Jerome Vermersch；Maroc Azziz；Jerome Coudre
    申请人:Aptiv Services France Sas；
    IPC主号:
    专利说明:

    Radar device for a motor vehicle and method for controlling the device.
    TECHNICAL AREA
    The present invention relates to a radar device for a motor vehicle and its control method. More particularly, the invention relates to the adjustment of the transmission power of the radar signal of the device in the event of obstruction of the field of vision of the radar.
    TECHNOLOGICAL BACKGROUND OF THE INVENTION
    Motor vehicles are increasingly equipped with driver assistance systems. One technology widely used in this context is radar. Radar systems assist the driver and can be used to detect obstacles in the front, rear or sides of the vehicle.
    Basically, the principle of radar detection sends a fixed frequency wave in an authorized frequency band with a given bandwidth. In addition, a certain emission power is applied to have a sufficient detection range to be able to detect obstacles distant from the vehicle.
    When two or more vehicles equipped with radar systems are in close proximity to each other, the field of vision of a radar of one vehicle can be blocked by another vehicle. This induces unnecessary electrical energy consumption associated with the radar.
    It is therefore important to offer a new solution to these problems.
    SUMMARY OF THE INVENTION
    According to the invention, a radar device for a motor vehicle comprises a radar antenna configured to detect a reflected signal characterized as reflection of an emitted signal reflected by an object present in the field of vision of the radar antenna; a controller configured to transmit at least one radar signal from the radar antenna, the radar signal being transmitted according to a determined object detection transmit power; the controller being configured to detect the power level of the reflected signal from the emitted radar signal reflected by the object detected. The controller is configured to adjust the transmit power according to the power level of the detected reflected signal to a minimum power sufficient for the detection of the detected object.
    The controller can also be configured to transmit a plurality of successive radar signals according to the determined transmit power, the controller being configured to adjust the transmit power based on the average of the power levels of the detected reflected signals.
    The reflected signal may include a plurality of reflected waves distributed in the field of view of the radar antenna so that the controller can be configured to detect the power level and the angular orientation, along the main axis of the field of view. vision, of each reflected wave. The controller is configured to determine a rate of shutter of the field of vision of the radar antenna according to the power level and the angular orientation of each reflected wave detected. The controller is configured to compare the determined shutter rate with a predefined shutter rate threshold. The controller can be configured to adjust the transmit power when the shutter rate is greater than the preset shutter rate threshold.
    According to the invention, a method of controlling a radar device comprises the steps of:
    emission of at least one radar signal according to a determined emission power of object detection from the radar antenna;
    detection of the power level of the reflected signal originating from the emitted radar signal reflected by the detected object;
    characterized in that the method includes the step of:
    adjustment of the transmission power according to the detected power level of the reflected signal to a minimum power sufficient for the detection of the detected object.
    The transmitting step can comprise the successive emission of a plurality of radar signals according to the same predefined transmitting power and the step of adjusting the transmitting power can comprise adjusting the power of emission according to the average of the power levels of the detected reflected signals.
    The reflected signal may include a plurality of reflected waves distributed in the field of view of the radar antenna such that the step of detecting the power level of the reflected signal comprises the step of detecting the power level and the angular orientation, along the main axis of the field of vision, of each reflected wave. The step for adjusting the transmission power may include a preliminary step for determining a rate of shutter of the field of vision of the radar antenna according to the power level and the angular orientation of each detected reflected wave. and a step of comparing the determined shutter rate with a predefined shutter rate threshold. The transmit power adjustment step may include a step of adjusting the transmit power when the shutter rate is greater than the predefined shutter rate threshold.
    According to the invention, a method of controlling a radar device arranged in a host vehicle comprises the steps of:
    emit a radar signal from the host vehicle according to a determined object detection power;
    detecting a reflected signal from the transmitted radar signal;
    determine the presence of a target vehicle in the field of vision of the radar device;
    determining a shutter rate for the field of vision of the radar antenna;
    compare the determined shutter rate with a predefined shutter rate threshold;
    reduce the transmitting power of the radar signal to a minimum detection power of the target vehicle when the shutter rate is higher than the predefined shutter rate threshold.
    According to the invention, a method of object detection by a host vehicle comprising a communication system between vehicles comprises the steps of:
    comparing the shutter rate of the field of view of a radar device with the predefined shutter rate threshold;
    allocate the object detection function in the field of vision of the radar device to the vehicle-to-vehicle communication system when the shutter rate is greater than the predefined shutter rate threshold;
    determining the location coordinates of the closed field of vision;
    detecting data received by the vehicle communication system relating to an object present in the closed field of vision according to the determined location coordinates.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Other characteristics, objects and advantages of the invention will appear on reading the detailed description which follows, and with reference to the appended drawings, given by way of non-limiting example and in which:
    - Figure 1 is a schematic view of a radar device in a first operating mode according to the invention.
    - Figure 2 is a schematic view of the radar device of Figure 1 according to a second mode of operation.
    - Figure 3 is a flow diagram of a method of controlling the radar device of Figure 1.
    - Figure 4 is a schematic representation of several radar devices arranged in a host vehicle and operating in a usual mode during heavy road traffic.
    - Figure 5 is a schematic representation of several radar devices arranged in a host vehicle and operating according to an operating mode of the invention.
    - Figure 6 is a flowchart of a method of controlling the radar device of Figure 1 when the radar device is arranged in a host vehicle.
    - Figure 7 is a schematic representation of the host vehicle traveling in heavy road traffic and detecting an object located in a closed field of vision area of a radar device of the host vehicle.
    FIG. 8 is a flow diagram of a method of object detection by the host vehicle when the field of vision of a radar device of the host vehicle is closed.
    DESCRIPTION OF THE PREFERRED EMBODIMENTS
    In order to facilitate the description, and without limitation, a longitudinal axis L and a transverse axis T are defined. "Left", "Right" and "Lateral" orientations are defined according to the transverse direction. "Front" and "rear" orientations are also defined in the longitudinal direction.
    According to FIG. 1, a radar device 10 comprises a radar antenna 12 and a controller 14. The radar device is configured to detect the presence of an object 16 in the field of vision 18 of the radar antenna 12.
    The controller 14 is configured to transmit to the radar antenna 12 a radar signal of determined transmission power, so that the radar antenna 12 transmits the radar signal 20 in its field of vision 18 along its main transmission axis P . The angular aperture a of the field of vision 18 extends symmetrically on either side of the main emission charge P of the radar device 10. The level of the transmission power of the emitted radar signal 20 and the angular aperture a of the field of view 18 of the radar antenna 12 are determined so as to be able to detect the object 16 present in the field of vision 18 up to a maximum distance according to the main emission P of the radar device 10.
    The radar antenna 12 is also configured to detect a reflected signal 22 characterized as a reflection of the transmitted signal 20 reflected by the object 16 present in the field of vision 18 of the radar antenna 12. The controller 14 is also configured to detecting the power level of the reflected signal 22 detected by the radar antenna 12.
    According to the invention, the controller 14 is configured to adjust the level of the transmission power in particular as a function of the power level of the detected reflected radar signal. This characteristic of the radar device 10 of the invention notably makes it possible to best adjust the energy consumption. More particularly, the controller 14 is configured to adjust the transmission power, according to the power level of the reflected radar signal 22 detected, to a minimum power sufficient for the detection of the object 16 detected. In other words, the controller 14 adjusts the maximum object detection distance as a function of the power level of the radar signal reflected 22 by said detected object 16.
    For example and without limitation, if the transmission power of the radar device 10 is determined beforehand according to a default level so as to be able to detect an object 16 up to a distance of 200 meters from the radar device 10 according to a field of vision of 150 degrees, and if the object 16 detected is located at a distance of the order of a few meters, then the power level of the signal reflected 22 by the said object will be analyzed by the controller 14 as being high so that the transmission power level of the transmitted radar signal 20 will be readjusted according to a minimum transmission power level necessary to detect the object 16 located a few meters from the radar device 10. However, when the object 16 leaves the field of vision 18 of the radar device 10, then the transmission power level of the transmitted radar signal 20 is readjusted according to its default value, that is to say a value allowing detection of Object up to 200 meters at an angular opening has a field of view of 150 degrees, or +/- 75 degrees on either side of the main axis P of emission.
    In order not to constantly adjust the transmission power of the transmitted radar signal 20, the controller 14 can be configured to transmit a plurality of successive radar signals 20 according to the determined transmission power during a determined period of time, the controller 14 being configured to adjust the transmit power according to the average of the power levels of the reflected signals 22 detected. This method of adjusting the transmitting power of the signal radar 20 also makes it possible to confirm the presence of an object 16 in the field of vision 18 of the radar device 10 for a determined period of time.
    Without limitation, the radar device 10 can for example transmit radar signals 20 in the field of vision 18 of the radar antenna 12 every 50 milliseconds so that the controller 14 can average the power levels of the reflected signals 22 received by the radar antenna 12 and detected by the controller 14 over a period of 500 milliseconds.
    According to FIG. 2, the controller 14 is configured to distribute the field of vision into a plurality of portions of field of vision 24, 26, 28, 30, 32, 34 extending on either side of the main axis. P of emission from the radar device 10. The plurality of portion of field of vision 24, 26, 28, 30, 32, 34 fully covers the field of view 18 of the radar device 10. Each portion of field of vision 24, 26, 28, 30, 32, 34 is characterized by its angular opening β. Preferably, the field of vision portions 24, 26, 28, 30, 32, 34 have an identical angular opening β. The controller 14 is configured to locate each portion of the field of vision 24, 26, 28, 30, 32, 34 according to its angular distance φ from the main axis P of emission of the radar device 10.
    According to FIG. 2, the reflected signal 22 comprises a plurality of reflected waves 36, 38, 40, 42, 44 distributed in the field of vision 18 of the radar antenna
    12. Each reflected wave 36, 38, 40, 42, 44 is characterized by its angular orientation γ along the main axis P of the field of view 18. Each reflected wave 36, 38, 40, 42, 44 received by the antenna radar 12 comes from a portion of the field of vision 26, 28, 30, 32, 34. The angular orientation γ of each reflected wave 36, 38, 40, 42, 44 allows the controller 14 to associate each reflected wave 36 , 38, 40, 42, 44 to the portion of the field of vision 26, 28, 30, 32, 34 in which it propagates towards the radar device 10. When the detected object 16 is close to the radar antenna, the field of vision 18 is partially or fully closed by said object 16. More precisely, the closer the object 16 detected in the field of vision 18 is to the radar device 10, the more a plurality of portions of the field of vision 28, 30, 32, 34 is closed by the object 16 detected. According to the invention, the controller is configured to determine a shutter rate of the field of vision 18 of the radar antenna 12 according to the power level and the angular orientation γ of each detected reflected wave.
    The ratio between the portions of closed field of vision 26, 28, 30, 32, 34 and the whole of the field of vision 18 is called the “shutter rate”. In a nonlimiting manner, a method of determining the shutter portions of fields of vision by the controller 14 consists in determining the power level of the reflected waves 36, 38, 40, 42, 44 of the portions of fields of vision 26, 28, 30, 32, 34 directly adjacent to each other, and by detecting a power level of the reflected waves 36, 38, 40, 42, 44 of the portions of fields of vision 26, 28, 30, 32, 34 adjacent to one another of the same order of magnitude. The order of magnitude of the power level of the reflected waves 36, 38, 40, 42, 44 of the field of vision portions 26, 28, 30, 32, 34 directly adjacent to each other when they are closed is generally detected and considered as raised by the controller 14, the detected object generally being at a close distance, that is to say a few meters, from the radar device 10.
    The controller 14 is configured to compare the determined shutter rate with a predefined shutter rate threshold.
    The controller 14 can then be configured to adjust the transmission power when the shutter rate is greater than the predefined shutter rate threshold.
    For example and in a nonlimiting manner, the power of the emission signal can be reduced if the field of vision 18 is blocked by more than 90% by the object 16 detected. The transmission power can be adjusted to a minimum power sufficient for the detection of the object 16 present in the field of vision 18.
    According to FIG. 3, a method of controlling 100 of the radar device described above in the above and illustrated in FIG. 1 comprises several steps.
    In order to detect an object 16 in the field of view 18 of the radar antenna 12, the method comprises a step 110 of transmitting at least one radar signal 20 according to a determined object detection transmit power from the radar antenna 12 then another step 125 of detecting the power level of the reflected signal 22 coming from the emitted radar signal 20 reflected by the object 16 detected. In order to limit the energy consumption of the radar device 10, a step of the control method 100 of the radar device 10 comprises a step 160 of adjusting the transmission power according to the detected power level of the reflected signal 22 at a power sufficient for the detection of the object 16 detected.
    To confirm the presence of the object in the field of vision 18, the step 110 of transmitting the radar signal 20 may comprise the successive emission of a plurality of radar signals 20 according to the same determined transmission power, in particular at regular time intervals then the step 160 for adjusting the transmission power is performed as a function of the arithmetic mean of the power levels of the reflected signals 22 detected.
    In order to reduce the transmission power of the radar signal emitted 20 when the field of vision 18 of the radar device 10 beyond the object 16 detected is not necessary, either because the field of vision 18 is blocked or either because the unobstructed field of vision is too narrow, the step 160 for adjusting the transmission power is preceded by a step 150 for comparing the field of view 18 shutter rate with a rate threshold d '' preset shutter. Finally the step 160 of adjusting the transmission power comprises a step of reducing the default transmission power of the radar device 10 when the shutter rate of the field of view 18 is greater than the threshold of the coverage rate. preset shutter.
    In order to determine the shutter rate of the field of vision 18, and since the reflected signal 22 comprises a plurality of reflected waves 36, 38, 40, 42, 44 distributed in the field of vision 18 of the radar antenna 12, the detection step 125 of the power level of the reflected signal 22 comprises a detection step 120 of the power level and a detection step 130 of the angular orientation γ, along the main axis P of the field of vision 18, of each reflected wave 36, 38, 40, 42, 44. Finally, the step of determining 140 of the shutter rate of the radar antenna 12 is therefore carried out according to the power level and the angular orientation γ of each reflected wave 36 , 38, 40, 42, 44 detected.
    It should be noted that when the radar device 10 is configured according to the power adjusted to the minimum detection power of the object 16, when the object 16 is no longer detected, the controller 14 is configured to readjust the power of emission at nominal power by default of object detection 16 of the radar device 10.
    According to FIG. 4, a host vehicle 50 comprises three radar devices similar to the radar device 10 of FIG. 1 and of FIG. 2. A first radar device 52 allows object detection in the front area of the host vehicle 10, a second radar device 54 allows object detection in the rear right area of the host vehicle 50 and a third radar device 56 allows object detection in the rear left area of the host vehicle 50. Each radar device 52, 54, 56 is configured to each transmit a radar transmission signal along its own main axis PI, P2, P3 of emission in its own field of vision 62, 64, 66.
    Without limitation to the invention, the host vehicle 50 travels on the central lane 58 of a route 60 comprising three lanes. The host vehicle 50 is in a road traffic situation according to which a plurality of other vehicles
    Vl, V2, V3, V4, V5, V6, V7, V8 surrounds the host vehicle 50. More particularly, vehicles Vl, V2, V3, V4, V5, V6, V7, V8 are located directly near the front of the host vehicle 50, of the rear of the host vehicle, on the right and left side of the host vehicle 50, on the front left and on the right front of the host vehicle 50, as well as on the rear right and the rear left of the host vehicle 50.
    According to this particular situation of road traffic, the other vehicles V1, V2, V3, V4, V5, V6, V7, V8 travel in the same direction as the host vehicle 50. This configuration of road traffic can for example be a situation during queue at road tolls, red lights or during traffic jams on wide roads such as highways.
    According to usual operation, each radar device 52, 54, 56 emits a radar signal at a determined nominal object detection power so as to be able to detect at least one vehicle V1, V2, V3, V4, V5, V6, V7, V8 generally targets up to a maximum distance Dml, Dm2, Dm3 (figure not to scale) much greater than ten meters in its field of vision 62, 64, 66. According to FIG. 4, each radar device 52, 54, 56 detects one or more vehicles V1, V2, V3, V4, V5, V6, V7, V8 targets located directly near the host vehicle 50 so that a large portion of each field of vision 62, 64, 66 of each radar device 52, 54, 56 is closed. In other words, by the presence of the target vehicles V1, V2, V3, V4, V5, V6, V7, V8 in the immediate vicinity of the host vehicle 50, each radar device 52, 54, 56 of the host vehicle 50 is in the inability to directly detect other vehicles on Route 60.
    According to FIG. 5, the host vehicle 50 is in the road traffic situation identical to FIG. 4. According to the control method 100 of the radar device 10 described in FIG. 3, the maximum distance Dml, Dm2, Dm3 for detecting object of each radar device 52, 54, 56 has been reduced by reducing the transmission power according to a minimum power level necessary allowing each radar device 52, 54, 56 to detect vehicles Vl, V2, V3, V4, V5 , V6, V7, V8 targets located in close proximity to the host vehicle 50. More specifically, the controller 14 of each radar device 52, 54, 56 has determined a shutter rate of each field of vision 62, 64, 66 of each radar device 52,
    54, 5 above a predefined shutter rate threshold.
    According to FIG. 6, when a radar device 52, similar to the radar device 10 described and illustrated in FIG. 1 and in FIG. 2, is arranged in the host vehicle 50 as illustrated in FIGS. 4 and 5, the method of controlling the radar device 52 arranged in the host vehicle 200 comprises several steps making it possible to adjust the transmission power of the radar device according to the detection of target vehicles. More particularly, the control method 200 comprises a step 210 of transmitting a radar signal 20 from the host vehicle 50 according to a determined object detection power 16. Then the method comprises a detection step 220 of the reflected signal 22 from of the radar signal emitted 20 in order to be able to determine the presence of a target vehicle VI in the field of vision 62 of the radar device 52. A next step comprises the determination 230 of the rate of shutter of the field of vision 62 of the radar antenna 12 and a step 240 of comparing the determined shutter rate with a predefined shutter rate threshold. Finally, the method comprises a step 250 of reducing the emission power of the radar signal 20 to a minimum detection power of the target vehicle VI when the shutter rate is greater than the predefined shutter rate threshold.
    According to FIG. 7, the host vehicle 50 is equipped with a means of communication between vehicles 70 which can communicate directly with other vehicles VI or indirectly with other vehicles VI by means of a server 72 broadcasting information received from other vehicles. This communication system between vehicles 70 is designated by the English term ‘vehicle to everything (V2X)’. The host vehicle 50 also includes an object detection device 74, the object detection device 74 being in communication with the radar devices 52, 54, 55 as described in FIGS. 4 and 5.
    According to the invention, in order to be able to detect another object 76 located in the area of a field of vision 62 closed off by a radar device 52 by a target vehicle VI, and when the radar device 52 has adjusted the power level of the radar signal emitted 20 at a reduced power level, the object detection device 74 initially comprising the radar device 52 is connected to the vehicle-to-vehicle communication means 70 so as to be able to detect data relating to the presence of other objects 76 in the closed portion of his field of vision.
    More particularly, the host vehicle 50 comprises an object detection system 74 comprising the radar device 52 and allocating an object detection function in the field of vision of the radar device 52 to the communication system between vehicles 70 when the rate of the shutter of the field of vision 62 is greater than the predefined shutter rate threshold. The inter-vehicle communication system 70 being configured to determine the location coordinates of the closed field of vision, in order to detect the presence of object 76 in the field of vision closed by the target vehicle VI, the inter-vehicle communication system 70 is configured to detect data 78 received by said communication system between vehicles 70 relating to an object 76 present in the field of vision 62 closed according to the determined location coordinates.
    By way of example and without limitation, according to FIG. 7, the target vehicle VI located at the front of the host vehicle 50 and closing the field of vision 62 of the first radar device 52 of the host vehicle 50 detects the presence of an object 76 via its own radar device. The data 80 of the target vehicle VI relating to the presence of the object 76 detected and of the location coordinates of the object 76 are broadcast to the road information server 72 by a communication device between vehicle of the target vehicle VI. The vehicle-to-vehicle communication system 70 of the host vehicle 50 receives data 78 relating to the presence of the detected object and its location coordinates so that the object detection system 74 of the host vehicle 50 can correlate this information with the location coordinates of the closed field of vision area. Thus, the host vehicle 50 can indirectly detect the object located in an area of the field of vision of one of its closed radar devices 52.
    According to FIG. 8, a method of detecting 300 of object 76 by the host vehicle 50 comprising a communication system between vehicles 70 and comprising the method of monitoring 200 of the radar device 52 arranged in the host vehicle 50, comprises a step of comparison 310 of the shutter rate of the field of view 62 of a radar device 52 with the predefined shutter rate threshold. A step 320 for allocating an object detection function in the field of vision 62 of the radar device 52 to the communication system between vehicles 70 when the shutter rate is greater than the predefined shutter rate threshold. The object detection method 300 comprises a step of determining 330 of the localization coordinates of the closed field of vision 62 and finally a step of detection 340 of the data received 78 by the communication system between vehicles 70 relating to an object 76 present in the field of vision 62 closed according to the determined location coordinates.
    权利要求:
    Claims (8)
    [1" id="c-fr-0001]
    1. Radar device (10) for a motor vehicle (50) comprising:
    a radar antenna (12) configured to detect a reflected signal (22) characterized as a reflection of an emitted signal (20) reflected by an object (16) present in the field of view (18) of the radar antenna ( 12);
    a controller (14) configured to transmit at least one radar signal (20) from the radar antenna (12), the radar signal (20) being transmitted according to a determined transmit object detection power (16); the controller (14) being configured to detect the power level of the reflected signal (22) originating from the emitted radar signal (20) reflected by the detected object (16);
    characterized in that the controller (14) is configured to adjust the transmit power according to the power level of the reflected signal (22) detected to a minimum power sufficient for the detection of the object (16) detected.
    [2" id="c-fr-0002]
    2. Radar device (10) according to the preceding claim characterized in that the controller (14) is configured to transmit a plurality of successive radar signals (20) according to the determined transmission power, the controller (14) being configured to adjust the transmission power according to the average of the power levels of the reflected signals (22) detected.
    [3" id="c-fr-0003]
    3. Radar device (10) according to any one of the preceding claims, characterized in that the reflected signal (22) comprises a plurality of reflected waves (36, 38, 40, 42, 44) distributed in the field of vision (18) of the radar antenna (18);
    the controller (14) is configured to detect the power level and the angular orientation (γ), according to the main charge (P) of the field of vision (18), of each reflected wave (36, 38, 40, 42, 44 );
    the controller (14) is configured to determine a rate of obturation of the field of vision (18) of the radar antenna (12) according to the power level and the angular orientation (γ) of each reflected wave (36, 38 , 40, 42, 44) detected;
    the controller (14) is configured to compare the determined shutter rate with a predefined shutter rate threshold;
    the controller (14) is configured to adjust the transmit power when the shutter rate is greater than the predefined shutter rate threshold.
    [4" id="c-fr-0004]
    4. Method for controlling (100) a radar device (10) of any one of the preceding claims, the method comprising the steps of:
    emission (110) of at least one radar signal (20) according to a determined object detection transmission power (16) from the radar antenna (12);
    detection (125) of the power level of the reflected signal (22) from the emitted radar signal (20) reflected by the object (16) detected;
    characterized in that the method (100) comprises the step of:
    adjusting (160) the transmit power according to the detected power level of the reflected signal (22) to a minimum power sufficient for the detection of the object (16) detected.
    [5" id="c-fr-0005]
    5. Control method (100) according to the preceding claim characterized in that the emission step (110) comprises the successive emission of a plurality of radar signals (20) according to the same predefined emission power;
    the transmitting power adjustment step (160) includes adjusting the transmitting power according to the average of the power levels of the detected reflected signals (22).
    [6" id="c-fr-0006]
    6. control method (100) according to any one of claims 4 or 5 for which the reflected signal (22) comprises a plurality of reflected waves (36, 38, 40, 42, 44) distributed in the field of vision (18) of the radar antenna (12); characterized in that the step of detecting (125) the power level of the reflected signal (22) comprises a step of detecting (120) the power level of each reflected wave (36, 38, 40, 42, 44) and a step of detecting (130) the angular orientation (γ), along the main axis (P) of the field of vision (18), of each reflected wave (36, 38, 40, 42, 44);
    the step of adjusting (160) the transmitting power includes:
    a preliminary step of determining (140) a rate of obturation of the field of vision (18) of the radar antenna (12) according to the power level and the angular orientation (γ) of each reflected wave (36, 38, 40, 42, 44) detected;
    a prior step of comparison (150) between the determined shutter rate and a predefined shutter rate threshold;
    the step of adjusting (160) the transmitting power when the shutter rate is greater than the predefined shutter rate threshold.
    [7" id="c-fr-0007]
    7. Control method (200) of a radar device (52) arranged in a host vehicle (50) comprising the method (100) of claim 6, the control method (200) of the radar device (52) arranged in the host vehicle (50) comprising the steps of:
    emitting (210) a radar signal (20) from the host vehicle (50) according to a determined object detection power (16);
    detecting (220) a reflected signal (22) from the transmitted radar signal (20);
    determining the presence (230) of a target vehicle (VI) in the field of vision (62) of the radar device (52);
    determining (230) a shutter rate of the field of view (62) of the radar antenna (12);
    comparing (240) the determined shutter rate with a predefined shutter rate threshold;
    reducing (250) the transmitting power of the radar signal (20) to a minimum detection power of the target vehicle (VI) when the shutter rate is greater than the predefined shutter rate threshold.
    [8" id="c-fr-0008]
    8. Method of detection (300) of object (76) by a host vehicle (50) comprising the method of control (200) of the radar device (52) of claim 7, the host vehicle (50) comprising a system of communication between vehicles (70), characterized in that the method (300) comprises the steps of:
    comparing (310) the shutter rate of view (62) of the radar device (52) with the predefined shutter rate threshold.
    allocating (320) the object detection function (76) in the field of vision (62) of the radar device (52) to the vehicle communication system (70) when the shutter rate is greater than the rate threshold d '' predefined filling; determining (330) the location coordinates of the closed field of vision (62);
    detecting (340) data received (78) by the communication system 5 between vehicles (70) relating to an object (76) present in the field of vision (62) closed according to the determined location coordinates.
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    同族专利:
    公开号 | 公开日
    EP3591422A1|2020-01-08|
    CN110749884A|2020-02-04|
    EP3591422B1|2021-09-29|
    FR3083620B1|2020-06-12|
    US20200011966A1|2020-01-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5345470A|1993-03-31|1994-09-06|Alexander Richard O|Methods of minimizing the interference between many multiple FMCW radars|
    US20060109170A1|2002-11-26|2006-05-25|Klaus Voigtlaender|Method and device for the adaptive regulation of power|
    US20100277359A1|2009-05-01|2010-11-04|Denso Corporation|Vehicle radar apparatus having variable output power controlled based on speed of vehicle|
    US20120129459A1|2010-11-19|2012-05-24|Industrial Technology Research Institute|Methods and systems of dynamic wireless transmitting power control|
    US11183071B2|2018-08-31|2021-11-23|International Business Machines Corporation|Drone flight optimization using drone-to-drone permissioning|
    DE102020103101A1|2020-02-06|2021-08-12|Audi Aktiengesellschaft|Method for operating a radar sensor in a motor vehicle and motor vehicle|
    FR3109452A1|2020-04-16|2021-10-22|Renault S.A.S|Method for detecting a traffic jam situation on a motor vehicle.|
    法律状态:
    2019-07-25| PLFP| Fee payment|Year of fee payment: 2 |
    2020-01-10| PLSC| Search report ready|Effective date: 20200110 |
    2020-05-01| TP| Transmission of property|Owner name: APTIV TECHNOLOGIES LIMITED, BB Effective date: 20200320 |
    2020-07-15| PLFP| Fee payment|Year of fee payment: 3 |
    2021-07-19| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1856202A|FR3083620B1|2018-07-05|2018-07-05|RADAR DEVICE FOR A MOTOR VEHICLE AND DEVICE CONTROL METHOD|
    FR1856202|2018-07-05|FR1856202A| FR3083620B1|2018-07-05|2018-07-05|RADAR DEVICE FOR A MOTOR VEHICLE AND DEVICE CONTROL METHOD|
    US16/456,806| US20200011966A1|2018-07-05|2019-06-28|Radar device for a motor vehicle and method for controlling the device|
    CN201910593894.2A| CN110749884A|2018-07-05|2019-07-03|Radar apparatus for motor vehicle and method for controlling the same|
    EP19184828.2A| EP3591422B1|2018-07-05|2019-07-05|Radar device for a motor vehicle and method for controlling the device.|
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