Application of Conditional Sampling to the Study of Cyclic Variability in a Spark-Ignition Engine
871173
11/08/1987
- Event
- Content
- Conditional sampling of cylinder-pressure data is used to investigate cyclic variability in a premixed-charge spark-ignited engine operating under fuel-lean conditions. Unlike straight ensemble averaging of pressure data, conditional sampling applies a set of constraints to the pressure data such that like combustion events can be identified and grouped together.Ensemble averaging of pressure data from an engine that exhibits significant cycle-to-cycle variation is shown to produce a mean pressure history that is not representative of the combustion process. Conditional sampling provides a means of identifying and analyzing the different groups of pressure histories and therefore the different types of combustion processes that occur in an engine that exhibits cyclic variability.
- Pages
- 10
- Citation
- Plee, S., Remboski, D., and Martin, J., "Application of Conditional Sampling to the Study of Cyclic Variability in a Spark-Ignition Engine," SAE Technical Paper 871173, 1987, .