This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Optimization of a CNG Driven SI Engine Within a Parallel Hybrid Power Train by Using EGR and an Oversized Turbocharger with Active-WG Control
Technical Paper
2010-01-0820
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The hybrid power train technology offers various prospects to
optimize the engine efficiency in order to minimize the CO₂
emissions of an internal-combustion-engine-powered vehicle. Today
different types of hybrid architectures like parallel, serial,
power split or through-the-road concepts are commonly known. To
achieve lowest fuel consumption the following hybrid electric
vehicle drive modes can be used: Start/Stop, pure electric/thermal
driving, recuperation of brake energy and the hybrid mode.
The high complexity of the interaction between those power
sources requires an extensive investigation to determine the
optimal configuration of a natural-gas-powered SI engine within a
parallel hybrid power train. Therefore, a turbocharged 1.0-liter
3-cylinder CNG engine was analyzed on the test bench. Using an
optimized combustion strategy, the engine was operated at
stoichiometric and lean air/fuel ratio applying both high- and
low-pressure EGR. The range of possibilities given by hybrid power
train architectures allows a phlegmatic operation strategy for the
internal-combustion engine, where the load demand is subject to
slow transients. By applying an oversized turbocharger (wider
turbine-neck cross-section) with Active-WG control (open wastegate
at part-load operation) the engine efficiency was optimized over
the whole operation range.
Secondary simulations of the longitudinal vehicle dynamic
behavior based on the measured steady-state performance maps from
the engine test bench were carried out. To manage the different
power sources a modified version of the common "Equivalent
Consumption Minimization Strategy" was used. This
"non-forward" looking operation strategy was developed to
attain the initial state of battery charge at the end of the
driving cycle. Consequently no compensation calculation had to be
performed. Furthermore this strategy was designed to achieve lowest
fuel consumption over the whole driving cycle. Hence, fuel
consumption and CO₂ emissions for legal driving cycles were
determined.
Recommended Content
Authors
Topic
Citation
Boland, D., Berner, H., and Bargende, M., "Optimization of a CNG Driven SI Engine Within a Parallel Hybrid Power Train by Using EGR and an Oversized Turbocharger with Active-WG Control," SAE Technical Paper 2010-01-0820, 2010, https://doi.org/10.4271/2010-01-0820.Also In
References
- Friedrich, C. Quarg, J. Berner, H.-J. Bargende, M. Leistungs- und Emissionspotential eines aufgeladenen 1-Liter-Erdgasmotors. Bargende, M. Wiedemann, J. Kraftfahrwesen und Verbrennungsmotoren, 4. Stuttgarter Symposium Expert-Verlag 2001
- Friedrich, C. Grebe, U. Effiziente Ottomotoren durch Erdgas und Aufladung. 9. Tagung: Der Arbeitsprozess des Verbrennungsmotors 2003
- Münz, S. Römuss, C. Schmidt, P. Brune, K.-H. Schiffer, H.-P. Diesel Engines with Low-Pressure Exhaust-Gas-Recirculation - Challenges for the Turbocharger. Motorentechnische Zeitschrift (MTZ) 2008 69
- Tüber, K. Ambros, W. Thermodynamischer Vergleich zwischen einer Hochdruck- und Niederdruck-Abgasrückführung. 5. Tagung Wärmemanagement im Haus der Technik Berlin 2006
- Paganelli, G. Delprat, S. Guerra, T. M. Rimaux, J. Santini, J. J. Equivalent Consumption Minimization Strategy for Parallel Hybrid Powertrains. IEEE 2002
- Musardo, C. Rizzoni, G. Staccia, B. A-ECMS: An Adaptive Algorithm for Hybrid Electric Vehicle Management. European Control Conference 2005