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Development of a charge motion controlled combustion system for DI SI engines and its vehicle application to EU-4 emission regulations
Technical Paper
2000-05-0058
Sector:
Language:
English
Abstract
The development of new passenger car powertrains with gasoline
direct- injection engines is facing new requirements which result
from the need of different operational modes with stratified and
homogeneous air-fuel mixture. Moreover, the exhaust aftertreatment
system causes a discontinuous operation with lean-burn absorption
periods followed by short rich spikes for catalyst
regeneration.
Recent work on combustion system development has shown, that
gasoline direct injection can create significant fuel economy
benefits. Charge motion controlled combustion systems have proven
to be of advantage in terms of low raw emissions compared to
wall-guided concepts. Based on an initial single-cylinder
development phase, a multi-cylinder engine was realized with
excellent fuel economy, low raw emissions and operational
robustness. Finally, the new engine''s potential has been
demonstrated in a mid-class vehicle.
The paper reports on the total development process starting from
single- cylinder testing through to engine-to-vehicle calibration.
The discussion also includes the efficient use of development
tools. The evaluation of fuel economy and emission potential is
derived from different development programs which are based on
applications of the charge motion-controlled, direct-injection
technology