Time to surge concept and surge control for acceleration performance
Time to surge concept and surge control for acceleration performance
Oskar Leufven and Lars Eriksson
Vehicular Systems, Dept. of Electrical Engineering, Linköping
University, SE-581 83 Linköping, Sweden,
{oleufven,larer}@isy.liu.se.
Abstract: Surge is a dangerous instability that can occur in
compressors. It is avoided using a valve that reduces the compressor
pressure. The control of this valve is important for the compressor
safety but it also has a direct influence on the acceleration
performance. Compressor surge control is investigated by first
studying the surge phenomenon in detail. Experimental data from a
dynamic compressor flow test bench and surge cycles measured on an
engine is used to tune and validate a model capable of describing
surge. A concept named time to surge is introduced and a sensitivity
analysis is performed to isolate the important characteristics that
influence surge transients in an engine. It is pointed out that the
controller clearly benefits from a feed-forward term due to the small
time frames associated with the transition to surge. In the next step
this knowledge is used in the design of a novel surge controller. This
surge controller is then compared to two other controllers and it is
shown that it avoids surge and improves the acceleration performance
by delivering both higher engine torque and turbo shaft speed after a
gear change.
Keywords: automobile powertrains, engine control, compressor, turbo,
system modeling
Oskar Leufven and Lars Eriksson
IFAC World Congress,
2008
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