WO2011145140A1 - 障害物検知装置 - Google Patents
障害物検知装置 Download PDFInfo
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- WO2011145140A1 WO2011145140A1 PCT/JP2010/003363 JP2010003363W WO2011145140A1 WO 2011145140 A1 WO2011145140 A1 WO 2011145140A1 JP 2010003363 W JP2010003363 W JP 2010003363W WO 2011145140 A1 WO2011145140 A1 WO 2011145140A1
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- Prior art keywords
- transmission
- time
- obstacle
- timing
- reflected wave
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Classifications
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- 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
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- 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
- G01S15/003—Bistatic sonar systems; Multistatic sonar systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/06—Systems determining the position data of a target
- G01S15/08—Systems for measuring distance only
- G01S15/10—Systems for measuring distance only using transmission of interrupted, pulse-modulated waves
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/93—Sonar systems specially adapted for specific applications for anti-collision purposes
- G01S15/931—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles
- G01S2015/937—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details
- G01S2015/938—Sonar systems specially adapted for specific applications for anti-collision purposes of land vehicles sensor installation details in the bumper area
Definitions
- the present invention relates to an obstacle detection device in which ultrasonic sensors as distance sensors are installed on the front, rear, left and right surfaces of a vehicle to improve the detection cycle without deteriorating the reliability of obstacle detection around the vehicle.
- the conventional obstacle detection device in order to avoid erroneous detection due to electric noise, it is determined that an obstacle has been detected twice in the same position (direction and distance) and recognized as an obstacle.
- Patent Document 1 when an ultrasonic pulse is continuously transmitted and a reflected signal having the same pulse width is continuously detected, it is recognized as a reflected signal from an obstacle.
- Patent Document 2 when ultrasonic pulses are transmitted simultaneously from a plurality of ultrasonic sensors, an area that cannot be detected due to interference of the transmission waves is generated. The sensor does not transmit at the same time.
- the present invention has been made to solve the above-mentioned problems, and has improved the detection accuracy of an object moving at a relatively high speed by increasing the transmission period of ultrasonic waves by a plurality of ultrasonic sensors.
- An object is to provide an apparatus.
- the obstacle detection device of the present invention includes a plurality of distance sensors having a transmission / reception function, a transmission / reception control unit that controls the distance sensor to transmit a transmission wave for a predetermined time and detects a reflected wave from the obstacle, and the transmission
- a time measurement unit that measures a first time from a start timing to a timing at which a reflected wave is detected and a second time from a timing at which the transmission is stopped to a timing at which the reflected wave disappears; the first time;
- An obstacle determination unit that determines that an obstacle exists if the time difference between the second times is within a predetermined allowable time.
- the determination time is at least 1 ⁇ 2 times that of the conventional selection technique, and the object moves at a relatively high speed. This has the effect of improving the detection accuracy.
- FIG. 3 is a timing diagram of transmission / reception of the transmission / reception ultrasonic sensor according to the first embodiment.
- 4 is a flowchart for explaining the operation of the obstacle detection device according to the first embodiment. 4 is a flowchart for explaining the operation of the obstacle detection device according to the first embodiment. It is a block diagram which shows the structure of the obstruction detection apparatus which concerns on Embodiment 2 of this invention in detail.
- FIG. 3 is a timing diagram of transmission / reception of the transmission / reception ultrasonic sensor according to the first embodiment.
- FIG. 2 shows the structure of the obstruction detection apparatus which concerns on Embodiment 2 of this invention in detail.
- FIG. 6 is a timing chart of transmission of a transmission-only ultrasonic sensor and reception of a reception-only ultrasonic sensor according to Embodiment 2.
- 10 is a flowchart for explaining the operation of the obstacle detection device according to the second embodiment.
- 10 is a flowchart for explaining the operation of the obstacle detection device according to the second embodiment. It is a block diagram which shows the structure of the obstruction detection apparatus which concerns on Embodiment 3 of this invention in detail.
- FIG. 10 is a timing diagram of transmission / reception of the transmission / reception ultrasonic sensor according to the third embodiment.
- 10 is a flowchart for explaining the operation of the obstacle detection device according to the third embodiment.
- 10 is a flowchart for explaining the operation of the obstacle detection device according to the third embodiment.
- FIG. 10 is a flowchart for explaining the operation of the obstacle detection device according to the fourth embodiment. It is explanatory drawing of a step-like obstacle and an echo propagation path. It is a timing diagram which shows the relationship between the transmission wave and reflected wave with respect to a step-shaped obstacle. It is a transmission / reception sequence diagram when an obstacle is not detected. It is a transmission / reception sequence diagram when an obstacle is detected.
- FIG. 1 is a plan view of a vehicle showing an obstacle measurement state.
- a plurality of transmission / reception ultrasonic sensors 2-1 to 2-n are arranged on the rear end surface of the vehicle 1 to form a horizontal detection area 3 and approach the vehicle.
- the rear vehicle 4 is detected as an obstacle.
- FIG. 2 is a block diagram showing an outline of the obstacle detection apparatus according to the first embodiment.
- the main body control unit 5 to which the transmission / reception ultrasonic sensors 2-1 to 2-n are connected, and the main body control unit 5
- FIG. 3 is a block diagram showing the main body control unit 5 in detail.
- the transmission / reception control units 51-1 to 51-n connected to the transmission / reception ultrasonic sensors 2-1 to 2-n and the transmission / reception control unit 51- 1 to 51-n connected to each of time measuring units 52-1 to 52-n and an obstacle determining unit for determining the presence or absence of an obstacle based on the outputs from the time measuring units 52-1 to 52-n 53, a propagation time determination unit 54 that determines the propagation time based on the output of the obstacle determination unit 53, and a transmission wait time determination unit 55 that determines the transmission wait time based on the output of the propagation time determination unit 54. ing.
- step ST1 ultrasonic waves are transmitted from the transmission / reception ultrasonic sensor 2-1 for a predetermined time.
- step ST2 it is determined whether the reflected wave from the obstacle, that is, echo 1 has been detected. If NO, the process proceeds to step ST8 via step ST29, and if YES, the time measuring unit.
- step ST3 the time t11 ( ⁇ distance L11) from the start of transmission to the detection of echo occurrence is measured (step ST3), and then the time t12 ( ⁇ distance L12) from the end of transmission to the disappearance of echo 1 is measured (step ST3) Step ST4).
- step ST5 t11 ⁇ t12 or
- ⁇ ⁇ t is determined by the obstacle determination unit 53 (step ST5). If NO, the process proceeds to step ST8 via step ST29.
- the object determination unit 53 determines an obstacle detection position (alerts that two consecutive matches are detected) (step ST6), and determines a transmission waiting time Tx1 (Tx1 ⁇ k ⁇ t11) (step ST7).
- step ST8 ultrasonic waves are transmitted from the transmission / reception ultrasonic sensor 2-2 for a predetermined time.
- step ST9 it is determined whether the reflected wave from the obstacle, that is, the echo 2 is detected. If NO, the process proceeds to step ST15 via step ST30. If YES, the time measuring unit is detected.
- a time t21 ( ⁇ distance L21) from the start of transmission to the detection of echo 2 occurrence is measured (step ST10), and thereafter a time t22 from the end of transmission to the disappearance of echo 2 ( ⁇ distance L22) is measured. (Step ST11).
- step ST12 t21 ⁇ t22 or
- ⁇ ⁇ t is determined by the obstacle determination unit 53 (step ST12). If NO, the process proceeds to step ST15 via step ST30.
- the object determination unit 53 determines an obstacle detection position (alerts that two consecutive matches are detected) (step ST13), and determines a transmission waiting time Tx2 (Tx2 ⁇ k ⁇ t21) (step ST14).
- step ST15 to ST21 and steps ST22 to ST28 are performed. Is repeated.
- step ST2 to step ST8 step ST9 to step ST15, step ST16 to step ST22, step ST23 to step ST1.
- the next ultrasonic sensor is activated after a predetermined time through steps ST29 to ST32 in the route to).
- the determination time is at least 1 ⁇ 2 times that of the conventional prior art. There is an effect of improving the detection accuracy of an object moving at a high speed.
- FIG. FIG. 6 is a block diagram showing in detail the configuration of the obstacle detection apparatus according to the second embodiment.
- Obstacle determination unit 59 propagation time determination unit 54 that determines propagation time based on the output of obstacle determination unit 59, and transmission wait time determination unit that determines transmission wait time based on the output of propagation time determination unit 54 55, and the output of the transmission waiting time determination unit 55 is It has configuration and supplied to the obstacle determining unit 59.
- the obstacle detection device based on the transmission timing of the transmission ultrasonic sensor 7-4 in FIG. 7, the transmission / reception timing diagram of the reception ultrasonic sensors 8-1 to 8-n, and the flowchart in FIG. Will be described.
- ultrasonic waves are continuously transmitted from the transmission ultrasonic sensor 7-1 (step ST8-1).
- step ST8-3 the transmission ultrasonic sensor 7- 1 is stopped (step ST8-3), and the time measurement unit 52-1 measures the time t0 ( ⁇ distance L0) from the end of the continuous transmission to the disappearance of the echo 1 (step ST8-4). ).
- step ST8-5 the transmission waiting time Tx1 (Tx1 ⁇ k (constant) ⁇ t0) is determined (step ST8-5), and after the determination, the transmission ultrasonic sensor 7-1 transmits 1 for a predetermined time (step ST8-6).
- step ST8-7 it is determined whether the reflected wave from the obstacle, that is, echo 2 has been detected (step ST8-7). If NO, the process returns to step ST8-1.
- the time t21 until the occurrence detection ( ⁇ distance L1) is measured (step ST8-8), and then t0 ⁇ t21 or
- the obstacle determination unit 53 makes an obstacle detection determination (alarm when two consecutive matches occur) (step ST8-10).
- step ST8-11 the time t22 (distance L2) from the stop of the transmission 1 for a certain time to the disappearance of the echo 2 is measured (step ST8-11), and the transmission waiting time Tx2 (Tx2 ⁇ k (constant) ⁇ t21) is determined (step (ST8-12) After the determination, the transmission ultrasonic sensor 7-1 transmits 2 for a predetermined time (step ST8-13).
- step ST8-14 it is determined whether the reflected wave from the obstacle, that is, the echo 3 has been detected (step ST8-14). If NO, the process returns to step ST8-1. If YES, the transmission 2 is started for a certain time. Measure time t31 ( ⁇ distance L3) until detection of echo 3 occurrence (step ST8-15), and then determine whether t22 ⁇ t31 or
- a time t32 (distance L4) from the stop of transmission 2 for a predetermined time to the disappearance of echo 2 is measured (step ST8-18), and a transmission waiting time Tx3 (Tx3 ⁇ k (constant) ⁇ t31) is determined (step ST8). -19) After the determination, the transmission ultrasonic sensor 7-1 transmits 3 for a predetermined time (step ST8-20).
- step ST8-21 it is determined whether the reflected wave from the obstacle, that is, the echo 3 has been detected. If NO, the process returns to step ST8-1. If YES, the transmission 3 starts from a certain time. Time tn-1 ( ⁇ n Ln-1) until the echo n-1 generation is detected is measured (step ST8-22), and then the above transmission / reception and obstacle detection determination operation are repeated (step ST8-23).
- FIG. 9 is a block diagram showing in detail the configuration of the obstacle detection apparatus according to the third embodiment.
- the components are the same as those in the first embodiment shown in FIG. 3, but the connections of the respective components are different. ing. That is, in the third embodiment, the transmission / reception control units 51-1 to 51-n and the time measurement units 52-1 to 52-n and the time measurement units 52-1 to 52-n and the obstacle determination unit 53 are connected. In this configuration, signals are exchanged and the output of the transmission waiting time determination unit 55 is supplied to the obstacle determination unit 53.
- ultrasonic waves are continuously transmitted from the transmission / reception ultrasonic sensor 2-1 (step ST11-1).
- step ST11-2 it is determined whether a reflected wave from the obstacle, that is, echo 1 is detected (step ST11-2). If NO, the process returns to step ST11-1, and if YES, transmission / reception in which echo 1 is detected is detected.
- the ultrasonic sensor 2-2 is specified, and continuous transmission of ultrasonic waves from the transmission / reception ultrasonic sensor 2-1 is stopped (step ST11-3).
- step ST11-4 the time t0 ( ⁇ distance L0) from the end of continuous transmission to the disappearance of echo 1 is measured (step ST11-4).
- a transmission waiting time Tx1 Tx1 ⁇ k (constant) ⁇ t0) is determined (step ST11-5), and after the determination, transmission 1 is performed from the transmission ultrasonic sensor 2-2 for a predetermined time (step ST11-6).
- step ST11-7 it is determined whether a reflected wave from the obstacle, that is, echo 2 is detected (step ST11-7). If NO, the process returns to step ST11-1, and if YES, transmission / reception in which echo 2 is detected is detected.
- the ultrasonic sensor 2-3 is specified, and the time t21 ( ⁇ distance L1) from the start of transmission 2 to the detection of the occurrence of echo 2 is measured (step ST11-8), and then t0 ⁇ t21 or
- the transmission waiting time Tx2 (Tx2 ⁇ k (constant) ⁇ t21) is determined (step ST11-12). After the transmission waiting time Tx2, the transmission / reception ultrasonic sensor 2-3 transmits 2 for a predetermined time (step ST11-13). ).
- step ST11-14 it is determined whether the reflected wave from the obstacle, that is, the echo 3 is detected (step ST11-14). If NO, the process returns to step ST11-1, and if YES, the transmission / reception detecting the echo 3 is performed.
- the ultrasonic sensor 2-n-1 is specified, and the time t31 ( ⁇ distance L3) from the start of transmission 2 for a predetermined time until the detection of the occurrence of echo 3 is measured (step ST11-15), and then t22 ⁇ t31 or
- a transmission waiting time Tx3 (Tx3 ⁇ k (constant) ⁇ t31) is determined (step ST11-19), and after the transmission waiting time Tx3, transmission / reception is performed 3 from the transmission / reception ultrasonic sensor 2-n-1 (step ST11). -20).
- step ST11-21 it is determined whether the reflected wave from the obstacle, that is, the echo n-1 is detected. If NO, the process returns to step ST11-1, and if YES, the echo n-1 is detected.
- the transmission / reception ultrasonic sensor 2n that has detected the above is specified, and the time tn-1 ( ⁇ distance Ln-1) from the start of transmission 3 for a certain period of time to the detection of the occurrence of echo n-1 is measured (step ST11-22).
- the transmission / reception and obstacle detection determination operation are repeated (step ST11-23).
- Embodiment 4 The configuration of the fourth embodiment shown in FIG. 12 is the same as that of the third embodiment, except that a transmission / reception ultrasonic sensor that detects an obstacle is identified and continuously transmitted / received until no obstacle is detected. .
- ultrasonic waves are continuously transmitted from the transmission / reception ultrasonic sensor 2-1 (step ST12-1).
- the ultrasonic sensor 2-2 is specified, and continuous transmission of ultrasonic waves from the transmission / reception ultrasonic sensor 2-1 is stopped (step ST12-3).
- step ST12-4 the time t0 from the end of continuous transmission until the disappearance of Echo 1 is measured (step ST12-4).
- a transmission waiting time Tx1 (Tx1 ⁇ k (constant) ⁇ t0) is determined (step ST12-5), and after the transmission waiting time Tx1, transmission 1 is transmitted 1 from the transmission / reception ultrasonic sensor 2-2 for a predetermined time (step ST12-6). ).
- step ST12-7 it is determined whether a reflected wave from the obstacle, that is, echo 2 is detected (step ST12-7). If NO, the process returns to step ST12-1, and if YES, transmission / reception in which echo 2 is detected is detected.
- the ultrasonic sensor 2-3 is specified, the time t21 from the start of transmission 1 to the detection of echo 2 occurrence is measured (step ST12-8), and then it is determined whether t0 ⁇ t21 (step ST12-9). If there is, the process returns to step ST12-1, and if YES, the obstacle determination unit 53 makes an obstacle detection determination (alerts that two consecutive matches occur) (step ST12-10).
- step ST12-11 Measure time t22 from transmission 1 stop for a certain period of time to disappearance of echo 2 (step ST12-11).
- the transmission waiting time Tx2 (Tx2 ⁇ k (constant) ⁇ t21) is determined (step ST12-12), and after the transmission waiting time Tx2, the transmission / reception ultrasonic sensor 2-3 transmits 2 for a predetermined time (step ST12-13). ).
- step ST12-14 it is determined whether the reflected wave from the obstacle, that is, the echo 3 is detected (step ST12-14). If NO, the process returns to step ST11-1, and if YES, the transmission / reception detecting the echo 3 is performed.
- the ultrasonic sensor 2-n-1 is specified, and the time t31 from the start of transmission 2 for a predetermined time to the detection of the occurrence of echo 3 is measured (step ST12-15). Thereafter, the above transmission / reception and obstacle detection determination operation are repeated ( Step ST12-16).
- the transmission / reception ultrasonic sensor that detects the obstacle is specified, and the transmission / reception is continuously performed until the obstacle is not detected. .
- the ultrasonic waves output from the transmission / reception ultrasonic sensor are the first surface 10 a and the second surface of the obstacle. Reflected from 10b and incident on the transmitting / receiving ultrasonic sensor.
- the echo disappearance timing is set to a timing at which the maximum value of the reflected wave becomes a certain level or a certain ratio or less. As a result, the closest approach position to the uneven obstacle can be detected accurately.
- FIG. 15 shows a transmission / reception sequence of a plurality of transmission / reception ultrasonic sensors in order to detect a wide range at high speed. It is possible to do so, and the detection area is widened accordingly.
- Table 1 the transmission / reception sequence when no obstacle is detected is shown in Table 1.
- transmission / reception ultrasonic sensor 2-2 transmits, the other transmission / reception ultrasonic sensors 2-1 and 2-3 to 2-n-1, 2-
- the other transmission / reception ultrasonic sensors 2-1, 2-2, 2-n-1, 2-n are sequentially switched as reception.
- FIG. 16 shows a transmission / reception sequence when an obstacle is detected, as shown in Table 2.
- the transmission / reception ultrasonic sensor 2-2 transmits, other transmission / reception ultrasonic sensors 2-1, 2-3 to 2-n-1 , 2-n is received and transmitted by the transmitting / receiving ultrasonic sensor 2-3, the other transmitting / receiving ultrasonic sensors 2-1, 2-2, 2-n-1, 2-n are sequentially switched so as to receive.
- the transmission / reception ultrasonic sensor 2-3 continues transmission, and the other transmission / reception ultrasonic sensors 2-1, 2-2, 2-n-1, 2-n continue to receive,
- the transmission / reception ultrasonic sensor 2-n-1 switches to transmission, and the other transmission / reception ultrasonic sensors 2-1 to 2-3, 2-n are switched to reception.
- the time from the start of transmission to the occurrence of echo and the time from the end of transmission to the disappearance of the echo have been described.
- the effect of is obtained.
- the ultrasonic sensor is used as the distance sensor.
- the distance sensor is a light or radio wave system, the same effect can be obtained.
- the obstacle detection device since the obstacle detection device according to the present invention performs obstacle detection by two measurements based on the transmission timing and disappearance timing of the reflected wave, the determination time is at least 1/2 times that of the conventional method. Thus, there is an effect of improving the detection accuracy of an object moving at a relatively high speed, which is suitable for use in a vehicle.
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Abstract
Description
また、特許文献2に記載された先行技術では、複数の超音波センサから同時に超音波パルスを送信すると、送信波が干渉し検知不能なエリアが発生するので、送信波が干渉する隣り合う超音波センサは同時に送信しないようにしている。
実施の形態1.
図1は障害物の計測状態を示す車両の平面図であり、車両1の後端面に複数の送受信超音波センサ2-1~2-nを配置して水平検知エリア3を形成し、接近する後方の車両4を障害物として検知する。
図6は実施の形態2に係る障害物検知装置の構成を詳細に示すブロック図であり、送信超音波センサ7-1に接続された送信制御部56-1と受信超音波センサ8-1~8-nのそれぞれに接続された受信制御部57-1~57-nと、受信制御部57-1~57-nのそれぞれに接続された時間計測部58-1~58-nと、送信制御部56-1を介して送信超音波センサ7-1に対し送信指令と送信停止指令を行うとともに、時間計測部58-1~58-nからの出力に基づいて障害物の有無を判定する障害物判定部59と、障害物判定部59の出力に基づいて伝播時間を判定する伝播時間判定部54と、伝播時間判定部54の出力に基づいて送信待ち時間を判定する送信待ち時間判定部55とを備え、この送信待ち時間判定部55の出力を障害物判定部59に供給する構成となっている。
図9は実施の形態3に係る障害物検知装置の構成を詳細に示すブロック図であり、その構成要素は図3に示した実施の形態1と同じであるが、各構成要素の接続が異なっている。すなわち、この実施の形態3では、送受信制御部51-1~51-nと時間計測部52-1~52-n、時間計測部52-1~52-nと障害物判定部53との間で信号のやり取りを行い、障害物判定部53に送信待ち時間判定部55の出力を供給する構成となっている。
以上のように、実施の形態3によれば、連続波を送信し常時障害物を監視するので、実施の形態2と同様の効果が得られる。
図12に示す実施の形態4の構成は実施の形態3と同じであるが、障害物を検知した送受信超音波センサを特定し、障害物を検知しなくなるまで連続送受信するようにした点が異なる。まず、送受信超音波センサ2-1から連続して超音波を送信する(ステップST12-1)。ついで、障害物からの反射波、つまり、エコー1が検知されたかを判断し(ステップST12-2),NOであれば、ステップST12-1に戻り、YESであれば、エコー1を検知した送受信超音波センサ2-2を特定し、上記の送受信超音波センサ2-1からの連続した超音波の送信を停止する(ステップST12-3)。
以上のように、実施の形態4によれば、障害物を検知した送受信超音波センサを特定し、障害物を検知しなくなるまで連続送受信するので、障害物検知の応答速度が速くなる効果がある。
この場合、エコーの消失タイミングは反射波の最大値の一定レベルあるいは一定割合以下になったタイミングとする。これによって、凹凸の障害物に対して最接近位置を正確に検出することができる。
また、図示の実施の形態では、距離センサとして超音波センサを用いて説明したが、距離センサとしては光、電波方式であっても同一の作用効果が得られる。
Claims (9)
- 送受信機能を有する複数の距離センサと、前記距離センサを制御して一定時間送信波を送信させ、障害物からの反射波を検知する送受信制御部と、前記送信開始タイミングから反射波を検知したタイミングまでの第1の時間および前記送信を停止したタイミングから反射波が消失したタイミングまでの第2の時間を計測する時間計測部と、前記第1の時間と前記第2の時間の時間差が予め定めた許容時間以内であれば障害物が存在すると判定する障害物判定部とを備えた障害物検知装置。
- 距離センサの次の一定時間幅での送信開始時間は一定あるいは計測時間に一定の係数を乗じて定めることを特徴とする請求項1記載の障害物検知装置。
- 距離センサを制御して一定時間送信波を送信させた後、反射波を検知できない時は予め定めた一定時間後に距離センサの次の送信を開始することを特徴とする請求項1記載の障害物検知装置。
- 反射波の検知タイミングと消失タイミングの時間差が予め定めた範囲内の場合は反射波と認識することを特徴とする請求項1記載の障害物検知装置。
- 反射波の消失タイミングは反射波の最大値の一定レベルあるいは一定割合以下になったタイミングとすることを特徴とする請求項1記載の障害物検知装置。
- 障害物に向けて送信波を送信する1以上の第1の距離センサと、前記障害物からの反射波を検知する1以上の第2の距離センサと、前記第1の距離センサのうちの一つを制御して送信波を連続送信させる送信制御部と、前記第2の距離センサの一つが障害物からの反射波を検知する受信制御部と、前記反射波を検知するタイミングで前記送信した第1の距離センサによる送信波の連続送信を停止させ、前記送信波の連続送信を停止したタイミングから前記検知した一つの第2の距離センサで前記反射波が消失したタイミングで前記障害物の検知と前記障害物までの第3の時間を計測する時間計測部と、前記計測時間の計測後、一定時間での送信波を前記第1の距離センサのうちの一つから送信させ、この送信開始タイミングから反射波を検知したタイミングまでの第1の時間および前記送信を停止したタイミングから反射波が消失したタイミングまでの第2の時間を計測し、前記第3の時間と前記第1の時間あるいは該第1の時間と第2の時間が予め定めた許容時間以内であれば障害物が存在すると判定する障害物判定部とを備えた障害物検知装置。
- 距離センサの次の一定時間幅での送信開始時間は一定あるいは計測時間に一定の係数を乗じて定めることを特徴とする請求項6記載の障害物検知装置。
- 距離センサから次の一定時間での送信開始時間は、距離センサを制御して一定時間送信波を送信させた後、反射波を検知できない時は予め定めた一定時間後に次の一定時間での送信波の送信を開始することを特徴とする請求項6記載の障害物検知装置。
- 車両前方、後方あるいは側方に設置した複数の距離センサのうち、送信専用距離センサおよび受信専用距離センサは、障害物を検知するまでは、順次送信および受信機能を切り替える機能を備えたことを特徴とする請求項6記載の障害物検知装置。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
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| US13/577,428 US8797829B2 (en) | 2010-05-19 | 2010-05-19 | Obstacle detection device |
| CN201080066532.5A CN102870005B (zh) | 2010-05-19 | 2010-05-19 | 障碍物检测装置 |
| PCT/JP2010/003363 WO2011145140A1 (ja) | 2010-05-19 | 2010-05-19 | 障害物検知装置 |
| JP2012515641A JP5128006B2 (ja) | 2010-05-19 | 2010-05-19 | 障害物検知装置 |
| DE112010005571.8T DE112010005571B4 (de) | 2010-05-19 | 2010-05-19 | Hinderniserfassungsvorrichtung |
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| PCT/JP2010/003363 WO2011145140A1 (ja) | 2010-05-19 | 2010-05-19 | 障害物検知装置 |
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| PCT/JP2010/003363 Ceased WO2011145140A1 (ja) | 2010-05-19 | 2010-05-19 | 障害物検知装置 |
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| US (1) | US8797829B2 (ja) |
| JP (1) | JP5128006B2 (ja) |
| CN (1) | CN102870005B (ja) |
| DE (1) | DE112010005571B4 (ja) |
| WO (1) | WO2011145140A1 (ja) |
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| JP2014092362A (ja) * | 2012-10-31 | 2014-05-19 | Panasonic Corp | 検知装置 |
| CN104181516A (zh) * | 2013-05-24 | 2014-12-03 | 罗伯特·博世有限公司 | 用于在机动车的驾驶员辅助系统中评估障碍物的方法 |
| JP2018144772A (ja) * | 2017-03-09 | 2018-09-20 | 株式会社Soken | 飛行装置 |
| CN110716540A (zh) * | 2019-10-08 | 2020-01-21 | 深圳市乐骑智能科技有限公司 | 电动滑板车自动行驶系统 |
| WO2020230231A1 (ja) * | 2019-05-13 | 2020-11-19 | 三菱電機株式会社 | 障害物検知装置 |
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| WO2011145140A1 (ja) * | 2010-05-19 | 2011-11-24 | 三菱電機株式会社 | 障害物検知装置 |
| NO337136B1 (no) * | 2012-05-16 | 2016-01-25 | Scantrawl As | Akustisk avstandsmåling til trål |
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| JP2016080641A (ja) | 2014-10-22 | 2016-05-16 | 株式会社デンソー | 物体検知装置 |
| JP6484000B2 (ja) | 2014-10-22 | 2019-03-13 | 株式会社デンソー | 物体検知装置 |
| JP6404679B2 (ja) | 2014-10-22 | 2018-10-10 | 株式会社デンソー | 物体検知装置 |
| US10852427B2 (en) * | 2017-06-30 | 2020-12-01 | Gopro, Inc. | Ultrasonic ranging state management for unmanned aerial vehicles |
| CN109684944B (zh) * | 2018-12-10 | 2021-09-03 | 百度在线网络技术(北京)有限公司 | 障碍物检测方法、装置、计算机设备和存储介质 |
| CN111098851A (zh) * | 2019-11-29 | 2020-05-05 | 惠州市德赛西威汽车电子股份有限公司 | 汽车盲区障碍物的检测方法、系统、存储介质和汽车 |
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Also Published As
| Publication number | Publication date |
|---|---|
| DE112010005571T5 (de) | 2013-03-07 |
| DE112010005571B4 (de) | 2015-10-01 |
| US8797829B2 (en) | 2014-08-05 |
| JPWO2011145140A1 (ja) | 2013-07-22 |
| US20120307594A1 (en) | 2012-12-06 |
| CN102870005A (zh) | 2013-01-09 |
| JP5128006B2 (ja) | 2013-01-23 |
| CN102870005B (zh) | 2015-07-08 |
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