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Method for biodiesel blending detection based on relative air-to-fuel ratio estimation

A biodiesel, relative technology, used in fuel testing, material inspection, fuel injection control, etc., to solve problems such as increased nitrogen oxide emissions

Inactive Publication Date: 2011-05-04
GM GLOBAL TECH OPERATIONS LLC
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  • Abstract
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Problems solved by technology

[0010] Additionally, biodiesel can lead to up to a 60% increase in nitrogen oxide emissions

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  • Method for biodiesel blending detection based on relative air-to-fuel ratio estimation
  • Method for biodiesel blending detection based on relative air-to-fuel ratio estimation
  • Method for biodiesel blending detection based on relative air-to-fuel ratio estimation

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Embodiment Construction

[0034] Preferred embodiments of the present invention will now be described.

[0035] According to the invention, the relative air-to-fuel ratio (RAFR) can be evaluated in two alternate ways; the first evaluation is done directly by means of the lambda sensor output voltage via the sensor output curve:

[0036] RAFR=f(V out ) (1)

[0037] Equation (1) is largely independent of fuel specifications, and thus it can detect the stoichiometry of the reaction in the case of petrodiesel and biodiesel fueling or mixtures thereof: its output can be considered as the true reference RAFR of the reaction.

[0038] The second way of estimating RAFR is done according to the following equation in combination with information from the captured air mass, measured for example by a hot-wire sensor HFM, and the fuel injection quantity evaluated by the ECU, the fuel injection Quantities are based on injector mapping corrected by the SW function:

[0039] RAFR = ...

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Abstract

A method is provided for biodiesel blending detection in an internal combustion engine that includes, but is not limited to a first evaluation of the relative air-to-fuel ratio (RAFR) by means of a first sensor whose output whose output is representative of the actual RAFR value, in order to use such first evaluation as a reference value, a second evaluation of the relative air-to-fuel ratio (RAFR) performed measuring mass air flow (MAF), injected fuel quantity (Qfuel) and stoichiometric air-to-fuel (A / F)ST ratio of petrodiesel and carrying out said second evaluation by means of the Electronic Control Unit (ECU) of the engine, and determining discrepancies of values obtained from the second evaluation compared with values obtained from the first evaluation.

Description

technical field [0001] The present invention relates to a method for biodiesel blending detection based on the evaluation of the relative air-to-fuel ratio performed by the electronic control unit (ECU) of the vehicle. Background technique [0002] Biodiesel can be used in recent modern diesel engines neat or mixed with petroleum diesel in any concentration. [0003] It can be expected that the use of biodiesel will increase in the future, especially due to the advantages of this fuel. [0004] In particular, the use of biodiesel can have a particle reduction effect of up to 80%. [0005] In addition, biodiesel provides recalibration of soot-NO x trade-off possibility to eliminate NO x increase. [0006] And, it also offers the possibility to reduce the regeneration frequency of the anti-particulate filter. [0007] However, the use of biodiesel is not without problems; for example, with biodiesel fuel, cold starting of the engine may become more difficult relative to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/26
CPCF02D19/081F02D41/0025F02D41/1454F02D41/1458F02D41/187F02D2200/0612F02D2400/08G01N33/2835F02D19/0636F02D19/0652Y02T10/30F02D19/08G01N33/22G01N33/2829
Inventor 艾伯托·瓦萨洛克劳迪奥·西亚拉维诺费德里科·L·古格利尔蒙
Owner GM GLOBAL TECH OPERATIONS LLC
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