[특허]Method and system for automatically detecting a preceding vehicle

Method and system for automatically detecting a preceding vehicle 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-015/50
출원번호	US-0841791 (1986-03-20)
우선권정보	JP-0118893 (1985-06-03)
발명자 / 주소	Etoh Yoshiyuki (Yokosuka JPX)
출원인 / 주소	Nissan Motor Company, Limited (Yokohama JPX 03)
인용정보	피인용 횟수 : 59 인용 특허 : 0

초록 ▼

A method and system for detecting a presence of a preceding vehicle moving in a front detection area of a controlled vehicle. In the method and system thereof, a plurality of laser or other kinds of beams are transmitted to any object present in the front detection area and the plurality of reflected beams are received so that the respective distances to the reflecting objects are measured on the basis of the propagation delay times between the transmission and reception of the beams. In the method and system thereof, each absolute difference between the current value of distance measured by any one of the beams and any one of previous value of distance measured by the corresponding or another one of the beams before a predetermined time (corresponds to an interruption time of a processing routine) is calculated and compared to a predetermined distance value which is relatively small in order to determine that the preceding vehicle which has been detected by any one of the beams within the predetermined time is the same as that which is currently detected by any one of the beams. Therefore, the presence of the preceding vehicle can accurately be detected without mistaking the preceding vehicle for another vehicle moving on a different traffic lane or as a stationary object located at either side of a traffic lane. This is true even when the controlled vehicle and preceding vehicle move on a curve road. Vehicle speed can be controlled to track the real preceding vehicle.

대표청구항 ▼

Apparatus for controlling the speed of a controlled vehicle to maintain a predetermined distance to a preceding vehicle identified as a target vehicle comprising: (a) means for determining the speed of said controlled vehicle, (b) a control vehicle speed adjustment mechanism responsive to a control signal for controlling the speed of said controlled vehicle, (c) transmitter means for generating transmitted waves toward a predetermined region preceding said controlled vehicle, (d) means for receiving waves reflected from objects in said predetermined region, (e) said predetermined region divided into at least a first and second adjacent regions and at least one of (1) said transmitter means transmitting separately defined transmitting waves into each of said first and second adjacent regions and (2) said receiver means having at least first and second aperture characteristics so as to distinguish waves reflected from each of said first and second adjacent regions, (f) means, operative when said preceding vehicle is in said first region, for periodically calculating a distance between said preceding vehicle and said controlled vehicle based on a measured travel time between the generation of said transmitted waves and the receipt, in said receiving means, of said reflected waves, said distance defined by l1i for the most recent calculation at time ti and l1i-1 for the immediately preceding calculation at time ti-1, (g) means, operative when said preceding vehicle is in said second region, for periodically calculating a distance between said preceding vehicle and said controlled vehicle based on a measured travel time between the generation of said transmitted waves and the receipt, in said receiving means, of said reflected waves, said distance defined by l2i for the most recent calculation at time ti and l2i-1 for the immediately preceding calculation at time ti-1, (h) means for storing the distances l1i-1 and l2i-1, (i) means operative after said preceding vehicle is in said first region during time ti-1 for determining if │l1i-│l1i-1│aai and for generating said control signal based on l1i and said determined controlled vehicle speed, and (j) means, operative if │l1i-l1i-1│≥a2i-l1i-1│a2i-l1i-1│ai and as said target vehicle and for generating said control signal based on l2i and said determined controlled vehicle speed.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Method and system for automatically detecting a preceding vehicle 원문보기

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Method and system for automatically detecting a preceding vehicle 원문보기

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