Method and device for filling level detection in a cylinder of a combustion engine

An internal combustion engine and cylinder technology, applied in electrical control, mechanical equipment, engine control, etc., can solve the problems of limited charge detection accuracy and large amount of calculation, and achieve the effect of reducing errors and improving stability

Active Publication Date: 2017-02-22
VOLKSWAGEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ventilation calculations can only provide limited accuracy in inflation d

Method used

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  • Method and device for filling level detection in a cylinder of a combustion engine
  • Method and device for filling level detection in a cylinder of a combustion engine
  • Method and device for filling level detection in a cylinder of a combustion engine

Examples

Experimental program
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Embodiment Construction

[0082] An embodiment according to the invention for charge detection in an internal combustion engine is in Figures 1 to 4D shown in . The exemplary embodiment relates to determining a fresh air mass in a cylinder of an internal combustion engine.

[0083] figure 1 A flow chart of the method according to the invention for carrying out the inflation detection 10 is shown. In a first step 100, fresh air mass measurements are provided as a function of the exhaust back pressure. exist figure 2 An example of measured data is shown in . figure 2 At constant speed n=1300 per minute and constant inlet valve position -20°KW and outlet valve position 5°KW for different intake manifold pressures p s1 =1400mbar,p s2 =1600mbar,p s3 =1800mbar,p s4 = 2200mbar and p s5 =2600mbar shows fresh air quality m fl The measured value of 30 is related to the exhaust back pressure p ag Relationship. Parts of the data set are displayed in each case for the measured values ​​of the constan...

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PUM

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Abstract

The invention relates to a method (10) for filling level detection in a cylinder of a combustion engine, said cylinder being connected to an intake runner via an inlet valve, and to an exhaust channel via an exhaust valve. The method (10) comprises the following steps: providing (102) a database having a data set relating to an amount of a filling component in accordance with an exhaust gas back pressure (pag) in the outlet channel, said step (102) of providing a database involving the provision (100) of measurement data (30) measured on a test bed, and the provision (101) of simulation data (31) calculated using a charge exchange calculation; determining (103) a basic function (20) that qualitatively describes the dependency of the filling component amount on the exhaust gas back pressure (pag); and adapting (104) the basic function (20) to at least the one data set of the database by appropriately selecting variable parameters of the basic function (20).

Description

technical field [0001] The invention relates to a method and a device for charge detection in a cylinder of an internal combustion engine. Background technique [0002] In order to operate the internal combustion engine of a motor vehicle with lower fuel consumption and reduced emissions of pollutants, the proportions of fresh air, residual gas and scavenging gas for the cylinder charge are adjusted by appropriately adjusting the intake and exhaust valves. For this purpose, in a four-stroke engine, for example, the four process steps of intake, compression, power and exhaust are traversed. During intake, the intake valve is opened just before the piston reaches top dead center, wherein the exhaust valve remains open. After passing top dead center, close the exhaust valve. The intake valve is not closed again until the piston has reached bottom dead center and has moved partially upwards again. Especially for internal combustion engines based on the Miller cycle method, th...

Claims

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Application Information

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IPC IPC(8): F02D41/24F02D41/14
CPCF02D41/1448F02D41/2429F02D2200/0402F02D2200/0406
Inventor L.彼得森L.布伦德尔J.施密德加德A.舒尔克维奇I.魏泽
Owner VOLKSWAGEN AG
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