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Method of determining fuel evaporation of engine sump

A technology of oil pan and engine, which is applied in the direction of engine testing, combustion engine, engine control, etc. It can solve problems such as wrong mixture adaptation, excessive emission, and drivability problems

Pending Publication Date: 2022-07-08
DELPHI INT OPERATIONS LUXEMBOURG S A R L
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And if the engine is operated at high temperatures, the model will assume that fuel is no longer present in the oil, but at low temperatures the chemical constituents that have not evaporated will evaporate and will lead to wrong mixture adaptation, drivability problems, emission excesses

Method used

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  • Method of determining fuel evaporation of engine sump
  • Method of determining fuel evaporation of engine sump
  • Method of determining fuel evaporation of engine sump

Examples

Experimental program
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Embodiment

[0049] Fuel in Oil Deposit Estimation

[0050] In the example, (the mass of) fuel, and thus the mass of fuel entering the oil sump, and / or the mass of fuel assumed to be in the oil sump, is considered to include multiple constituents, each constituent having a different rate of evaporation or characteristics, depending on the temperature. Thus, the mass of the fuel is effectively divided into multiple regional masses, and each regional mass is considered individually when determining the amount of vaporization or the amount in the oil sump. For each zone, it is assumed that the fuel fraction evaporates at a certain rate that depends, for example, on temperature.

[0051] Figure 4a as well as Figure 4b An example of an evaporation curve is shown, which is the percentage of fuel evaporated relative to temperature. The curve according to the example is divided into regions as shown. In the figure, the curve is divided, ie into five zones Z1, Z2, Z3, Z4 and Z5. Preferabl...

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Abstract

A method of determining a total evaporation rate of a fuel of a sump of an engine, comprising: a) defining, for said fuel, a plurality of (n-1) regions, each region comprising a separate temperature range and corresponding to a particular fuel component portion; b) for each region, determining or estimating a mass of the specific fuel component portion present in the sump; c) for each zone, determining the evaporation rate on the basis of the oil temperature and the respective mass determined in step b); d) summing the evaporation rates of each zone obtained from step c) to obtain the total evaporation rate.

Description

technical field [0001] The present invention relates to a method of determining the evaporation (vaporization) of fuel deposits in an oil pan. The invention also relates to a method of determining the amount of fuel deposits (residues) in the oil pan. Background technique [0002] Due to modern engine mechanics and the gasoline content (with ethanol) used, the phenomenon of fuel in oil has often been ignored or roughly estimated, which needs to be accurately evaluated to meet drivability and emission constraints. At low temperatures, the mixture used to start and warm up the engine is very rich. Not all of the injected fuel is burned: a portion from this fuel is delivered to the exhaust and the remainder goes to the sump. [0003] The first direct result of fuel deposits is an increase in the oil level. The second is the change in oil quality. The third is a phenomenon called "fuel vaporization". When the oil temperature begins to rise, the fuel will evaporate and enter...

Claims

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Application Information

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IPC IPC(8): F02D41/00
CPCF02D41/0025F02D2200/023F02D2200/0608F02D2200/0612F02D2250/11F02D2250/08F02D41/021F02D41/047F02D41/30F02D41/34F01M11/10F01M2250/00F02D41/22F02D2200/06G01M15/042
Inventor M·伯纳德M·莱恩哈特O·依茜曼
Owner DELPHI INT OPERATIONS LUXEMBOURG S A R L