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A Development Methodology for Improving the Cold Start Performance of Spark Ignition Engines
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English
Abstract
Optimising an engine specification to improve cold start performance has been investigated. Taguchi methods were used to define a test programme to assess the effect of seven build factors. Experiments were conducted to measure mixture ratio at the spark plug location after a short period of engine cranking at test conditions covering ± 15°C and three fuel-mass-supplied values. The analysis of the results identified build modifications which improved start quality and reduced HC and CO emissions substantially compared to a reference, base-line build. Injector design and location, and inlet valve timing were found to have most influence on robustness to uncontrolled variations in mixture preparation during starts.
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Citation
Shayler, P., Tinwell, P., Dixon, J., and Eade, D., "A Development Methodology for Improving the Cold Start Performance of Spark Ignition Engines," SAE Technical Paper 940084, 1994, https://doi.org/10.4271/940084.Also In
References
- Shayler, P J Isaacs, R M Ma, T H “Cold Start Performance of SI Engines” Paper 481/6 IMechE Pub “Experimental Methods in Engine Research” 1988
- Ross, P J “Taguchi Techniques for Quality Engineering” McGraw-Hill 1988
- Taguchi, G “System of Experimental Design” 1 Pub Unipub/Kraus 1987
- Grove, D M Davis, T P “Engineering Quality and Experimental Design” Pub Longman 1992
- Shayler, P J Isaacs, R M Ma, T H “SI Engine Cold Start Behaviour and Control” EAEC Int Conf Strasbourg 1989