Fluid flow, combustion and efficiency with early or late inlet valve closing

Fredrik Söderberg; Bengt Johansson

doi:10.4271/972937

Fluid flow, combustion and efficiency with early or late inlet valve closing

Fredrik Söderberg^*, Bengt Johansson

^*Corresponding author for this work

Physical Sciences and Engineering

Research output: Contribution to conference › Paper › peer-review

10 Scopus citations

Abstract

This paper is a study of the effects of valve timing and how it influences the in-cylinder fluid flow, the combustion, and the efficiency of the engine. An engine load of 4.0 bar imep_net was achieved by setting the inlet valve closing time early or late to enable unthrottled operation. Inlet valve deactivation was also used and asymmetrical valve timing, i.e. valve timing with the two inlet valves opening and closing at different times. The valve timing was altered by switching cam lobes between the experiments. The results indicate a longer flame development period but a faster combustion with early inlet valve closing compared to the throttled case. For late inlet valve closing, a variation in the combustion duration results. As expected, the pumping mean effective pressure (PMEP) was greatly reduced with early and late inlet valve closing compared to the throttled case.

Original language	English (US)
DOIs	https://doi.org/10.4271/972937
State	Published - Dec 1 1997
Event	International Fall Fuels and Lubricants Meeting and Exposition - Tulsa, OK, United States Duration: Oct 13 1997 → Oct 16 1997

Other

Other	International Fall Fuels and Lubricants Meeting and Exposition
Country/Territory	United States
City	Tulsa, OK
Period	10/13/97 → 10/16/97

ASJC Scopus subject areas

Automotive Engineering
Safety, Risk, Reliability and Quality
Pollution
Industrial and Manufacturing Engineering

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title = "Fluid flow, combustion and efficiency with early or late inlet valve closing",

abstract = "This paper is a study of the effects of valve timing and how it influences the in-cylinder fluid flow, the combustion, and the efficiency of the engine. An engine load of 4.0 bar imepnet was achieved by setting the inlet valve closing time early or late to enable unthrottled operation. Inlet valve deactivation was also used and asymmetrical valve timing, i.e. valve timing with the two inlet valves opening and closing at different times. The valve timing was altered by switching cam lobes between the experiments. The results indicate a longer flame development period but a faster combustion with early inlet valve closing compared to the throttled case. For late inlet valve closing, a variation in the combustion duration results. As expected, the pumping mean effective pressure (PMEP) was greatly reduced with early and late inlet valve closing compared to the throttled case.",

author = "Fredrik S{\"o}derberg and Bengt Johansson",

year = "1997",

month = dec,

day = "1",

doi = "10.4271/972937",

language = "English (US)",

note = "International Fall Fuels and Lubricants Meeting and Exposition ; Conference date: 13-10-1997 Through 16-10-1997",

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TY - CONF

T1 - Fluid flow, combustion and efficiency with early or late inlet valve closing

AU - Söderberg, Fredrik

AU - Johansson, Bengt

PY - 1997/12/1

Y1 - 1997/12/1

N2 - This paper is a study of the effects of valve timing and how it influences the in-cylinder fluid flow, the combustion, and the efficiency of the engine. An engine load of 4.0 bar imepnet was achieved by setting the inlet valve closing time early or late to enable unthrottled operation. Inlet valve deactivation was also used and asymmetrical valve timing, i.e. valve timing with the two inlet valves opening and closing at different times. The valve timing was altered by switching cam lobes between the experiments. The results indicate a longer flame development period but a faster combustion with early inlet valve closing compared to the throttled case. For late inlet valve closing, a variation in the combustion duration results. As expected, the pumping mean effective pressure (PMEP) was greatly reduced with early and late inlet valve closing compared to the throttled case.

AB - This paper is a study of the effects of valve timing and how it influences the in-cylinder fluid flow, the combustion, and the efficiency of the engine. An engine load of 4.0 bar imepnet was achieved by setting the inlet valve closing time early or late to enable unthrottled operation. Inlet valve deactivation was also used and asymmetrical valve timing, i.e. valve timing with the two inlet valves opening and closing at different times. The valve timing was altered by switching cam lobes between the experiments. The results indicate a longer flame development period but a faster combustion with early inlet valve closing compared to the throttled case. For late inlet valve closing, a variation in the combustion duration results. As expected, the pumping mean effective pressure (PMEP) was greatly reduced with early and late inlet valve closing compared to the throttled case.

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U2 - 10.4271/972937

DO - 10.4271/972937

M3 - Paper

T2 - International Fall Fuels and Lubricants Meeting and Exposition

Y2 - 13 October 1997 through 16 October 1997

ER -

Fluid flow, combustion and efficiency with early or late inlet valve closing

Abstract

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