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EP0341675A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Alcohol sensor

Assignee: Mitsubishi Electric Corp
•
Filing: 1989-05-09
•
Granted: —
•
Expires: 2009-05-09
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Abstract

Abstract An electric sensor capable of measuring a mixing ratio of alcohol in fuel even if the volume resistivity of the fuel decreases due to an increase in concentration of alcohol in gasoline or due to an increase in percentage of water content in gasoline. The alcohol sensor above having an electrostatic capacity detecting section disposed in a fuel passage (1) to measure an electrostatic capacity for detecting thereby a mixing ratio of alcohol in fuel,is constructed in such a manner that a surface of each of electrode layers (2) which form the electrostatic capacity detecting section is covered with an electric insulating layer (3). The electric insulating layers (3) always assure charging or discharging of the capacitor provided by the electrostatic capacity detecting section.

Inventors

  • 👤 Hiroko Mitsubishi Denki K. K. Maekawa
  • 👤 Hiroyoshi Mitsubishi Denki K. K. Suzuki
  • 👤 Kenji Mitsubishi Denki K. K. Ogawa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-24 16:08
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/60; G01N27/02; G01N27/22; G01N27/221; G01N33/00; G01N33/26; G01N33/28; G01N33/2835; G01N33/2852

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 78 words
An alcohol sensor for measuring a ratio of alcohol con­tained in a fuel fed through a fuel passage (1), said alcohol sensor comprising: an electrostatic capacity detecting section (CR) disposed in said fuel passage (1) to measure an electric capacity of the fuel fed therethrough; and a plurality of electrode layers (2) that form said electrostatic capacity detecting section (CR); wherein a sur­face of each of said electrode layers (2) is covered with an electric insulating layer (3).
Claim 2
Dependent Claim 78 words
An alcohol sensor for measuring a ratio of alcohol con­tained in a fuel fed through a fuel passage (1), said alcohol sensor comprising: an electrostatic capacity detecting section (CR) disposed in said fuel passage (1) to measure an electric capacity of the fuel fed therethrough; and a plurality of electrode layers (2) that form said electrostatic capacity detecting section (CR); wherein a sur­face of each of said electrode layers (2) is covered with an electric insulating layer (3).
Claim 3
Dependent Claim 58 words
An alcohol sensor according to claim 1, wherein said electrostatic capacity detecting section (CR) comprises a plurality of electrode plates (10) forming said electrode layers and a pair of lead wires (5a, 5b) for interconnecting said electrode plates (10), said electrode plates (10) being supported in said fuel passage (1) by way of said lead wires (5a, 5b).
Claim 4
Dependent Claim 28 words
An alcohol sensor according to claim 2, wherein each of said electric insulating layers (3) is sufficiently thin com­pared with a distance (dx) between said electrode plates (10).
Claim 5
Dependent Claim 28 words
An alcohol sensor according to any one of claims 1 to 3, wherein said electric insulating layers (3) are made of a material having a high dielectric constant.
Claim 6
Dependent Claim 51 words
An alcohol sensor according to claims 2 to 4, wherein each of said electrode plates is formed with a pair of electrode layers (2) printed on the opposite surfaces of a base plate (6) thereof, each of said electrode layers (2) being formed with said electric insulating layers (3) printed thereon.

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