Abstract
To meet the increased demands of new exhaust and CO2 limits a research project of Volkswagen R&D, the Techni- cal University of Poznan and the Ostfalia University of Applied Sciences has been initiated; its main target was the development and adaptation ICOS (Internal Combustion Optical Sensor) - an infraredsensor of LaVision for on-line measurements of EGR-rate in cylinder of an engine under operation. The objective of the project was to determine by different optical signals the CO2 concentration, the EGR rate and residual gas which are cycle-resolved in the cylinder. In this paper the principle of measurement of optical indication has been described. The infrared sensor was validated by a one-cylinder diesel engine and compared to a synchronously running fast gas sampling system (CSV). Finally the practical application of various parameter variations is illustrated in the determination of the EGR and residual gas rate. Thus a new measurement techniąue for the development offuture generations of engines introduced.
Highlights
A good uniform distribution of the exhaust gas recirculation (EGR) rate and a uniform residual gas mass on all cylinders are the basic requirements for a suitable serial combustion method in compliance with the emission limits which simultaneously contain low fuel consumption
Of crucial importance for the optimal design of current and future combustion methods is the accurate recording of the equal uniform distribution and the residual gas in the cylinder
To determine the concentration of CO2 and the EGR rate only the compression phase up to TDC is of significance
Summary
A good uniform distribution of the EGR rate and a uniform residual gas mass on all cylinders are the basic requirements for a suitable serial combustion method in compliance with the emission limits which simultaneously contain low fuel consumption. The current measuring technique is a gas analysis with a fast sampling valve. This technique is of limited suitability because it can neither measure cycleresolved nor is the measuring accuracy sufficient nor is the handling of the entire engine simple. Równomierny rozkład stopnia recyrkulacji spalin oraz reszty spalin w cylindrze we wszystkich cylindrach silnika wielocylindrowego jest dziś podstawowym wymaganiem dla równomiernego przebiegu procesu spalania z zachowaniem norm emisji, który jednocześnie pozwala na osiągnięcie małego zużycia paliwa. Kluczowe znaczenie dla optymalnego projektowania obecnych i przyszłych systemów spalania jest dokładne określenie równomiernego rozdziału spalin oraz określenie reszty spalin w cylindrze. Obecnie stosowane techniki pomiarowe wykorzystują analizę spalin z wykorzystaniem szybkich zaworów do pobierania próbek z cylindra.
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