Engine Test Bench Turbo Mapping
A method for determining turbocharger performance on installations in
an engine test bench is developed and investigated. The focus is on
the mapping of compressor performance but some attention is also given
to the turbine mapping. An analysis of the limits that an engine
installation imposes on the reachable points in the compressor map is
performed, in particular it shows what corrected flows and pressure
ratios can be reached and what these limitations depend on. To be able
to span over a larger region of the corrected ow a throttle before the
compressor is suggested and this is also veried in the test bench.
Turbocharger mapping is a time consuming process and there is a need
for a systematic process that can be executed automatically. An engine
and test cell control structure that can be used to automate and
monitor the measurements by controlling the system to the desired
operating points is also proposed.
In experiments, used for constructing the compressor speed lines, it
is virtually impossible to control the turbocharger to the exact
corrected speed that is postulated by the speed line. To overcome this
two methods that compensate for the deviation between measured speed
and the desired speed are proposed and investigated. Detailed data
from a gas stand is used to evaluate the measurements compared to
those that are generated in the engine test cell installation. The
agreements are generally good but there is more noise in the engine
data and there are also some small systematic deviations.
Oskar Leufven and Lars Eriksson
2010
Informationsansvarig: webmaster
Senast uppdaterad: 2021-11-10
LiU Homepage
