[특허]Vehicle in-lane positional indication/control by phase detection of RF signals induced in completely-passive resonant-l

Vehicle in-lane positional indication/control by phase detection of RF signals induced in completely-passive resonant-l 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G08G-001/01
출원번호	US-0634659 (1996-04-18)
발명자 / 주소	Bush E. William
대리인 / 주소	Fuess & Davidenas
인용정보	피인용 횟수 : 47 인용 특허 : 0

초록 ▼

A vehicle's position is determined, normally within .+-.0.37 inches, relative to an imaginary center line of a road lane along which are buried, normally about every 13 feet, completely passive resonant circuits, normally each a simple, inexpensive and durable 1-turn 11.5" diameter shallow loop of #12 copper wire in series with a proper capacitor, nominally 10 nanofarads, for resonance. In-lane positional determination is in and by a phase detection circuit, and process. A low-power r.f. electromagnetic field, normally 1.9432 MHz, is maintained in a (i) vertically- or (ii) horizontally-oriented first loop, normally a 6-turn 6-inch coil. Resonance is electromagnetically induced in nearby road coils; radiated fields are not involved. The induced r.f. field is itself then detected in a another, second, loop means within the vehicle. This second loop means may be a (i) horizontally-oriented 6-turn 6-inch coil, or, alternatively and for improved linearity of detection about lane center, (ii) two coils that are in the same plane, orthogonal relative to the first loop, and at any arbitrary angle (other than 90.degree.) relative to the first loop. As the vehicle proceeds down the highway lane a position detector circuit provides an output error signal voltage--equivalent to the phase difference between the maintained and the detected electromagnetic fields--that is (nominally) positive if the vehicle is on the left side of the road loops, or negative if the vehicle is on the right side of the road loops. When the vehicle reaches the center of the lane then the positional error voltage (i.e., the phase difference) nulls out. This error voltage is used to provide the driver with a "steer left" or "steer right" indication, normally in and by a meter. In expansion of the system to fully-automated lane-holding control, the developed positional error voltage signal is used to control the steering of the vehicle.

대표청구항 ▼

[ What is claimed is:] [1.] A method of determining a vehicle's position on road lane comprising:positioning a multiplicity of passive resonant circuits along a road lane;inductively coupling a first electromagnetic field from a first loop means in the vehicle as the vehicle proceeds along the road lane so that electromagnetic energy is inductively coupled from this first loop means into one or more of the multiplicity of resonant circuits as are then proximate to the vehicle, causing these one or more resonant circuits to themselves produce another, second, electromagnetic field; anddetecting, in another, second, loop means in the vehicle as the vehicle proceeds along the road lane, a phase and a polarity of the second electromagnetic field relative to a phase and a polarity of the first electromagnetic field as an indication of the vehicle's position upon the road land relative to those one or more of the multiplicity of resonant circuits into which energy was inductively coupled.

이 특허를 인용한 특허 (47)

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Peake, John W., Method and apparatus for automatic vehicle guidance using continuous 2-D poly-point path.
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Kakinami Toshiaki,JPX ; Kimura Yoshikatsu,JPX ; Inoue Ryo,JPX, Method and apparatus for detecting a lane on a road.
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Clark, Tracy M.; Perreault, Brian M., Passive position-sensing and communications for vehicles on a pathway.
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Thornton,Richard D.; Clark,Tracy M., Suspending, guiding and propelling vehicles using magnetic forces.
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연합인증

Vehicle in-lane positional indication/control by phase detection of RF signals induced in completely-passive resonant-l 원문보기

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