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Fast Response Measurement of Combustion Air to Fuel Ratio for Stratified Two-Stroke Engines
Technical Paper
2005-32-0109
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English
Abstract
Due to emission regulations for hand-held power tools more and more stratified-charge two-stroke engines enter into the market [Sawada et al. 1998, Zahn et al. 2000]. These engines require investigations and treatment for tuning the transient behaviour that are beyond the methods of the tuning for conventional engines. Especially the in-cylinder air-to-fuel-ratio cannot be determined from simple exhaust gas analysis any more.
This paper presents an exhaust gas sampling system to enable the use of a standard lambda meter for a fast response measurement of air to fuel ratio out of the combustion chamber. The gas is sampled by means of a small restriction directly out of the combustion chamber. In case of miss-fire the hydrocarbon concentration in the sample is too high for the lambda sensor. With a dilution or a pre-converter system the hydrocarbon concentration can be adjusted to the range of the lambda sensor. Verification has been done with several tests.
The air to fuel ratio in combustion is a key issue to tune the transient behaviour and to meet all customer requirements of the engine performance.
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Citation
GEYER, K., HALLÉ, C., and ROßKAMP, H., "Fast Response Measurement of Combustion Air to Fuel Ratio for Stratified Two-Stroke Engines," SAE Technical Paper 2005-32-0109, 2005.Also In
References
- Blair, G. P. Design and Simulation of Two-Stroke Engines SAE 1-56091-685-0 1996
- Sawada, T. Wada, M. Development of a Low Emission Two-Stroke Cycle Engine SAE-Paper 980761 1998
- Zahn, W. Rosskamp, H. Schlossarczyk, J. Low Emission Technologies for High-Performance Handheld Outdoor Products SAE-Paper 2000-01-0896 2000