Publicerad: 2015-11-25
ISBN: 978-91-7685-900-1
ISSN: 1650-3686 (tryckt), 1650-3740 (online)
The paper extends a mean value model of a parallel turbocharged
internal combustion engine with a crank angle resolved cylinder model.
The result is a 0D engine model that includes the pulsating flow from
the intake and exhaust valves. The model captures variations in turbo
speed and pressure, and therefore variations in the compressor
operating point, during an engine cycle. The model is used to study
the effect of the pulsating flow on mass flow balance and surge margin
in parallel turbocharged engines, where two compressors are connected
to a common intake manifold. This configuration is harder to control
compared to single turbocharged systems, since the compressors
interact and can work against each other, resulting in co-surge. Even
with equal average compressor speed and flow, the engine pulsations
introduce an oscillation in the turbo speeds and mass flow over the
engine cycle. This simulation study use the developed model to
investigates how the engine pulsations effect the in cycle variation
in compressor operating point and the sensitivity to co-surge. It
also shows how a short circuit pipe between the two exhaust manifolds
could increase surge margin at the expense of less available turbine
energy.
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