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2 Journal of KONES

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Interaction between injection timing, EGR – rate and rate of heat release in the TDI – engine

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Willmann M. , Opaliński A. , Wisłocki K.

Journal of KONES

2002

tom Vol. 9, No. 1-2

275-282

The high-speed diesel engine has been developed intensively in the past few years. Customer-relevant engine performance data such as BMEP, fuel consumption, exhaust and noise emissions have been improved and the advantages in comparison to the gasoline engine (fuel consumption and torque characteristics) has become more significant. To comply with the very low soot and NOx – limits diesel engines operate with high injection pressure, high EGR – rate and very late injection timing. As these low emissions are the result of different Rates of Heat Release (ROHR), it has to be investigated which features of ROHR are relevant to emissions. They provide important information as to the direction that further development work should take. The investigations were made for broad parameter variation at different engine operating points. As one result it can be pointed out that ROHR itself is not sufficient to describe emissions. At some operating points with different A/F ratios the ROHR were the same and emissions were different. However, ROHR in connection with A/F – ratio and other thermodynamic parameters give very good information on NOx and soot emissions which indicates the practical possibilities to reduce these emissions.

A practical approach in the thermodynamical analysis of the TDI - process

100%

Willmann M. , Vanhaelst R. , Opalinski A.

Journal of KONES

2001

tom Vol. 8, No. 1-2

35-44

High speed diesel engines have been developed intensively in the past few years.The customers relevant engine performance data as: bmep, fuel consumption, exhaust and noise emissions have been improved. To reach all objectives in time, all affords of designers and scientists with the aid of a modern development will be necessary. This paper deals with new methods and theories in the thermodynamical analysis of the TOI engine, which need a cylinder indicating pressure, optical measurements and new calculation models. To evaluate the rate of heat-release, which is introduced into the 2-zone-model, the measured cylinder pressure has to be adjusted. With the aid of a new procedure the absolute level of the measured pressure can be determined. In addition to that an improved method for evaluation of the cylinder-mass in the EGR-mode will be presented. The combination of the calculated rate of heat - release and measured values from the test cell like the composition of exhaust gas will be read into a new theory of two zones. The concentration of NO and soot will be calculated in dependence of the crank angle and verified by optical measurements. The goal of this research work is to reduce the exhaust gas emissions through a better understanding of the internal combustion process. With the so obtained results it would be able to modify engine control and design. The report about the use of the new methods and theories during thermodynamic analysis at the TDI-research will be continued.