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특허 상세정보

Heat radiating type liquid level sensing system and the method therefor

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) G01B-007/00    G01F-023/00   
미국특허분류(USC) 364/562; 073/295; 073/304.R
출원번호 US-0886593 (1992-05-21)
우선권정보 JP-0093096 (1990-04-10); JP-0093097 (1990-04-10); JP-0251815 (1990-09-25); JP-0272435 (1990-10-12); JP-0002465 (1991-01-29)
발명자 / 주소
출원인 / 주소
대리인 / 주소
    Wigman, Cohen, Leitner & Myers
인용정보 피인용 횟수 : 6  인용 특허 : 13
초록

To eliminate an ambient temperature correcting sensor and further to improve the sensor response speed in a heat radiating type liquid level sensing system, a constant current pulse is periodically passed through a level sensor to heat it; level sensor voltages sampled at predetermined time intervals when the level sensor is being heated are divided by each initial sensor voltage to obtain sensor voltage ratios with respect to time; an approximate voltage is calculated on the basis of the the obtained ratios in accordance with an approximation equation; ...

대표
청구항

1. A heat radiating type liquid level sensing system for sensing liquid level in a tank which is subject to being inclined, comprising: (a) a single resistive level sensor immersed in a liquid within a tank when said liquid is present in said tank; (b) a constant current generator connected across said resistive level sensor, (c) said constant current generator periodically generating a constant current pulse passed through said resistive level sensor in such a manner as to thereby generate radiating heat in said resistive level sensor and to genera...

이 특허에 인용된 특허 (13)

  1. Nawrocki Ryszard (Inkster MI). Apparatus and method for gauging the amount of fuel in a vehicle fuel tank subject to tilt. USP1991125072615.
  2. Khnel Frank (Eschborn DEX). Circuit arrangement for the electrothermal measurement of level. USP1986104619140.
  3. Khnel Frank (Eschborn DEX). Circuit for electrothermal level measurement compensated for ambient temperature. USP1986124633491.
  4. Bezard Jean-Jacques (La Garenne FRX) Jourdain Charles-Henri (Colombes FRX) Lalanne Bruno (Courbevoie FRX). Device for checking the level of a liquid in a tank. USP1979084163391.
  5. Hauschild Wolfgang (Bad Soden DEX) Baumgart Hans J. (Schwalbach DEX). Device for electric monitoring of the level of a liquid in a container. USP1982114361037.
  6. Re Fiorentin Stefano (Grugliasco ITX) Tonello Piero (Cigliano ITX). Device for measuring the quantity of liquid contained in a tank. USP1990064935727.
  7. Steffenhagen Ulrich (Liederbach DEX). Device for temporarily blocking the re-measurement of an electric oil level measurement of a machine, particularly an in. USP1990074943797.
  8. Albrecht Klaus (Liederbach DEX) Haub Martin (Steinbach DEX). Device for the electric monitoring of the level of a liquid contained in a container. USP1984014425795.
  9. Schneider Dieter (Frankfurt am Main DEX). Electrothermal measurement of levels compensated for ambient temperature. USP1987024640127.
  10. Kobayashi Hiroshi (Yokohama JPX) Kita Toru (Yokosuka JPX). Fuel gauge for an automotive vehicle. USP1984094470296.
  11. Sasaki Kazuyuki (Susono JPX) Kataoka Ichiro (Susono JPX). Heat-radiation type level sensor. USP1991045007288.
  12. Vetter Egon (Hofheim DEX) Pfeifer Thomas (Eppstein DEX) Burghoff Heinz-Georg (Reichenbach DEX) Daub Werner (Stuttgart DEX). Method and device for indicating the level of liquid in an automobile fuel tank. USP1990014890491.
  13. Cerruti Eraldo (Turin ITX). Method for detecting the fuel level in the tank of a motor vehicle. USP1990034912646.