Fuel composition sensing systems and methods using EMF wave propagation
US7836756B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2007 |
| Grant date | Nov 23, 2010 |
| Priority date | — |
| Expiry date | Dec 18, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/2852
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A flex fuel sensor is deployed in conjunction with the fuel transfer line (e.g. around a plastic fuel line) or at the bottom/side of a fuel tank. An RF signal of a constant frequency may be generated across a resonant circuit, which comprises of an inductor and a PCB trace capacitor, capacitor plates, semi cylindrical capacitor plates, or the like. Electromagnetic radiation is propagated into the passing fuel in the transfer pipe. The conductivity and dielectric properties of the fuel change the capacitance of the trace capacitor/capacitor plates. These changes are proportional to ethanol/alcohol content of the fuel and are preferably detected by a microcontroller, or the like, and then transmitted to a flex fuel vehicle Engine Management System.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.