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Abstract |
Control and Optimization of Turbo Charged Spark Ignited Engines
Lars Eriksson, Simon Frei, Christopher Onder, and Lino Guzzella ETH Zurich, Switzerland
and
Linköping University The subject of this study is the trade-off between fuel economy and
transient performance in turbocharged engines. It quantifies the losses and
gains of different engine control strategies. Two extreme strategies are
analyzed, one for optimal fuel economy and the other for fast transient
response. Models for the components that influence the fuel economy are
developed and described. An optimization problem for best fuel economy is
solved analytically and a fuel-optimal controller is implemented based on
that result. This controller is compared to one which is optimized for fast
transient response with respect to the gains in fuel economy and losses in
transient response. Simulations of a highly boosted engine show that a
fuel-optimal controller can improve the fuel economy of a vehicle operated
at cruising speed by 1-3% and at highway speed by 4%, and that the highest
achievable improvement is above 10%. The losses in transient response are
around 0.4 s for cruising conditions. Furthermore, measurements on a
low-boosted engine on a test bench are used to show that the fuel-optimal
controller reduces fuel consumption by 1.9% at highway conditions.
Lars Eriksson, Simon Frei, Christopher Onder and Lino Guzzella
IFAC World Congress, 2002
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