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Ionization and Ionization rate of a two-stroke HCCI engine fuelled with E85 for control feedback
conference contribution
posted on 2011-05-31, 15:46 authored by Keith James, Rui Chen, J.W.G. TurnerHomogenous Charge Compression Ignition (HCCI)
combustion phasing and stability provides a challenging
control problem over conventional combustion technologies
of Spark Ignition (SI) and Compression Ignition (CI). Due to
the auto ignition nature of the HCCI combustion there are no
direct methods for actuation, the combustion and the phasing
relies on indirect methods. This in itself creates a nonlinear
dynamic problem between the relationships of control
actuators and the combustion behavior. In order to control the
process, an accurate feedback signal is necessary to
determine the state of the actual combustion process.
Ideally to ensure that combustion remains stable and phased
correctly an in-cylinder feedback of each cylinder for multi
cylinder engines would be preferable. Feedback has been
seen in studies using piezoelectric pressure sensors for
visually monitoring the pressure in the combustion chamber.
This is expensive and requires redesign of the combustion
chamber. A potential alternative feedback is to use the
conventional spark plug as a sensor. This is achieved by
applying a voltage across the spark plug to provide a sensor
for ion current. The ions are created through the combustion
event, and the current is created by the flow of the ions
between the spark plug gap.
The work presented in this paper provides a comparison
between ion current feedback and pressure trace for a two
stroke HCCI combustion from a control perspective. The
emphasis of the work is to show the capability of using the
ion current system as feedback for information for the start of combustion, combustion duration, and rate of combustion and
estimations on peak pressure magnitude. These key
parameters from the signal could be useful when applied as
feedback for closed loop control.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Aeronautical and Automotive Engineering
Citation
JAMES, K., CHEN, R. and TURNER, J., 2010. Ionization and Ionization rate of a two-stroke HCCI engine fuelled with E85 for control feedback. IN: Proceedings of SAE 2010 World Congress, Detroit, USA, 13th-15th April.Publisher
© SAE InternationalVersion
- AM (Accepted Manuscript)
Publication date
2010Notes
This is a conference paper [2010 © SAE International]. It was posted on this site with permission from SAE International. Further use and distribution of this paper requires permission from SAE International.Publisher version
Book series
SAE Technical Papers;2010-01-1247Language
- en