Alcohol fuel alcohol content detection method and module

Abstract

The invention discloses an alcohol fuel alcohol content detection method and module for alcohol fuel automobiles. The method comprises the following steps of: collecting oxygen content O(n) of automobile tail gas; acquiring an air-fuel ratio alpha c (n) according to O (n) and the preset alcohol content Ap (n); acquring oil injection quantity Fc(n) according to alpha c(n) and engine air input G; calculating the fuel deviation Fd(n)=[Fc(n)-Fp(n)] / Fp(n), wherein Fp(n) is the preset oil injection quantity; acquring the alcohol content deviation Ad(n) according to Fd(n); calculating the current alcohol content Ar(n)=Ad(n)+Ap(n); amending Ap(n+1); acquring the current oil injection quantity Fr(n) according to Ar(n); amending Fr(n+1); injecting fuel according to Fr(n) and repeating the steps; and stopping repeating when the absolute value of Fd(n) is less than the fuel deviation stabilized value S. The alcohol fuel alcohol content detection method disclosed by the invention can detect the alcohol content in the fuel, and improves the using performance of fuel automobiles.

Description

technical field [0001] The invention relates to the field of flexible fuel vehicles, in particular to a method and module for detecting alcohol content of ethanol fuel. Background technique [0002] Fuel ethanol belongs to renewable energy and can be processed from raw materials such as grain and various plant fibers. Ethanol flexible fuel refers to a fuel that is made by adding a certain proportion of fuel ethanol to gasoline component oil according to the volume ratio and blending it through a specific process. Usually, ethanol flexible fuel is called ethanol fuel. As a new type of clean fuel, ethanol fuel is currently the focus of the development of renewable energy in the world. Its advantages are as follows: high octane number, good anti-knock performance; high oxygen content, which is conducive to full combustion; can effectively dredge the impurities in fuel Precipitation and condensation; can effectively reduce vehicle exhaust emissions, improve energy structure; ea...

AI Technical Summary

Problems solved by technology

[0003] During the use of ethanol fuel, it is often faced with the problem of alcohol content changes in ethanol fuel. When the alcohol content changes, the fuel injection volume of the engine will not change correspondingly with the change of alcohol content, which may easily cause excessive fuel injection or Too little, the fuel is difficult to burn completely, and the pollutants in the vehicle exhaust will also increase

Now it is often used to install an ethanol content sensor in the fuel tank to realize the judgment of ethanol content, but the sensor is expensive, which is not conducive to product cost control

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