Garrett Electric Boosting Systems (EBS) Program Page: 2 of 50
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Executive Summary
Turbo diesel engine use in passenger cars in Europe has resulted in
30-50% improvement in fuel economy. Diesel engine application is
particularly suitable for US because of vehicle size and duty cycle patterns.
Adopting this technology for use in the US presents two issues .. emissions
and driveability. Emissions reduction technology is being well addressed with
advanced turbocharging, fuel injection and catalytic aftertreatment
systems. One way to address driveability is to eliminate turbo lag and
increase low speed torque. Electrically assisted turbocharging concepts
incorporated in e-TurboTM designs do both.
The purpose of this project is to design and develop an electrically
assisted turbocharger, e-TurboTM, for diesel engine use in the US. In this
report, early design and development of electrical assist technology is
described together with issues and potential benefits. In this early phase a
mathematical model was developed and verified. The model was used in a
sensitivity study. The results of the sensitivity study together with the
design and test of first generation hardware was fed into second generation
designs. In order to fully realize the benefits of electrical assist technology
it was necessary to expand the scope of work to include technology on the
compressor side as well as electronic controls concepts. The results of the
expanded scope of work are also reported here.
In the first instance, designs and hardware were developed for a
small engine to quantify and demonstrate benefits. The turbo size was such
that it could be applied in a bi-turbo configuration to an SUV sized V engine,
Mathematical simulation was used to quantify the possible benefits in an
SUV application. It is shown that low speed torque can be increased to get
the high performance expected in US, automatic transmission vehicles. It
is also shown that e-TurboTM can be used to generate modest amounts of
electrical power and supplement the alternator under most load-speed
conditions. It is shown that a single (large) e-Turbo consumes slightly
less electrical power for the same steady state torque shaping than a bi-
Turbo configuration However, the transient response of a bi-Turbo
configuration in slightly better.
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Arnold, Steve; Balis, Craig; Barthelet, Pierre; Poix, Etienne; Samad, Tariq; Hampson, Greg et al. Garrett Electric Boosting Systems (EBS) Program, report, March 31, 2005; United States. (https://digital.library.unt.edu/ark:/67531/metadc878509/m1/2/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.