Ultrasonic car height measuring apparatus


PURPOSE:To make it possible to always and accurately measure a car height without being affected by the state of a road surface, by correcting a measured value on the basis of the rising characteristics of a receiving wave returned while reflected from the road surface. CONSTITUTION:The ultrasonic pulse transmitted from a transmitter 3 is reflected at a road surface 4 and the reflected pulse is received by a receiver 5. This receiving output is respectively applied to a wave form shaping circuit 8 and a wave form rising circuit 16 through an amplifier 6 and a rectifier circuit 7. In this case, when the receiving wave becomes weak by the state of the road surface, the rising of the output wave form of the rectifier circuit 7 becomes gentle to generate a measuring error. Hereupon, an analytical circuit 16 receives the output of the rectifier circuit 7 to measure the rising characteristics of the receiving wave ans a correction value N is fabricated based on this rising characteristics. Subsequently, this correction value and the output of the wave form shaping circuit 8 are inputted to a micro CPU15 for operating car height. By this method, the car height can always accurately measured without being affected by the state of the road surface.




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Patent Citations (1)

    Publication numberPublication dateAssigneeTitle
    JP-S5439156-AMarch 26, 1979Nippon SokenDistance measuring device loaded on car

NO-Patent Citations (0)


Cited By (6)

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    EP-0871580-A1October 21, 1998Technical Services and Marketing. Inc.Rail car load sensor
    EP-0871580-A4January 13, 1999Tech Serv & Marketing IncLadesensor für schienenfahrzeug
    JP-S60146172-AAugust 01, 1985Kubota LtdNon-contact type distance measuring apparatus
    JP-S6267481-AMarch 27, 1987Matsushita Electric Ind Co LtdUltrasonic type distance measuring apparatus
    JP-S6446317-AFebruary 20, 1989Nec CorpCounter circuit
    US-4677599-AJune 30, 1987Nissan Motor Company, LimitedUltra-sonic distance measuring apparatus and method