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Stoichiometric air to fuel ratio sensor system

An air-fuel ratio, stoichiometric technology for use in sensor systems that addresses environmental and durability constraints, and high cost of near-infrared sensors

Active Publication Date: 2015-12-23
VITESCO TECH USA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the cost of NIR sensors is high, and such sensors may be limited by the environment and durability

Method used

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  • Stoichiometric air to fuel ratio sensor system
  • Stoichiometric air to fuel ratio sensor system
  • Stoichiometric air to fuel ratio sensor system

Examples

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Embodiment Construction

[0017] From the examples discussed below, it has been determined that the stoichiometric (or Stoichiometric) air-fuel ratio (SAFR) of a given fuel can be related to its dielectric properties independently of the type of alcohol used. Correlation between dielectric properties and SAFR in figure 1 shown in . As shown, as the concentration of alcohol in the fuel increases along the x-axis, the permittivity increases and the SAFR decreases. figure 2 The table of shows the SAFR and dielectric constant for various fuel mixtures.

[0018] refer to image 3 , obtained according to a measurement unit (cell) generally shown in 10 provided by an embodiment figure 1 and 2 The data. The measurement unit 10 has: a first sensor electrode 12 which is a cathode; and a second sensor electrode 14 which is an anode. These electrodes define a capacitor. The equivalent circuit of the measurement unit 10 is also image 3 , where capacitor C is connected in parallel with resistor R. The fir...

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Abstract

A sensor system (36) determines the Stoichiometric Air to Fuel Ratio (SAFR) of fuel mixtures. The system includes a first electrode (12) and a second electrode (14), with the first electrode surrounding the second electrode so that a fuel mixture can flow between the first electrode and the second electrode. The electrodes are constructed and arranged to provide data for determining a conductivity and permittivity of the fuel mixture. A temperature sensor (18) is constructed and arranged to measure a temperature of the fuel mixture. A processor (19) is constructed and arranged to determine the SAFR of the fuel mixture based on the measured temperature and permittivity of the fuel mixture.

Description

technical field [0001] Embodiments of the present invention relate to a stoichiometric air fuel ratio (SAFR) sensor system for measuring the dielectric constant, conductivity and temperature of a given fuel mixture and outputting the SAFR. Background technique [0002] The use of alcohols as an alternative fuel is becoming more and more common. One of the biggest challenges in using alcohols as fuels is the difference between the stoichiometric air-fuel ratio (SAFR) of gasoline and the stoichiometric air-fuel ratio (SAFR) of alcohols. Different SAFRs mean that fuel pumps and fuel injectors must deliver different volumes of fuel, depending on the concentration of alcohol in the fuel. This challenge is further exacerbated by the fact that different types of alcohols have different SAFRs. [0003] Conventional flex fuel sensors are capable of determining the concentration of ethanol in a given fuel, or the concentration of methanol in a given fuel. The downside of this techn...

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Application Information

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IPC IPC(8): F02D41/14F02D41/00
CPCG01K13/02G01N27/226G01N33/2852F02D19/084F02D19/087F02D41/0002F02D2200/0611
Inventor B.J.麦凯I.P.范维尔真
Owner VITESCO TECH USA
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