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Abstract |
Ion Sensing for Combustion Stability Control of a Spark Ignited Direct Injected Engine
SAE Technical Paper 2000-01-0552 Ingemar Andersson
Mecel AB
Lars Eriksson
Linköping university
The combustion stability of a direct injected spark ignited engine
depends on the injection timing and it is desirable to have a
controller that minimizes the combustion variability. A novel approach for determining combustion stability in stratified
mode is presented that rely on the ionization current and enables
closed loop control of the injection timing. The coefficient of
variation for IMEP is used as a measure of combustion stability and a
connection between maximum torque and low combustion variability is
pointed out. The coefficient of variation of the ion current integral
is well correlated with the coefficient of variation for IMEP.
Furthermore, it is shown how the integral of the ion current together
with COV(ion integral) can be used to determine the combustion
stability and to distinguish high combustion stability from misfire.
Ingemar Andersson and Lars Eriksson
2000
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