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CNG engines for 2000-2010~European pollutants and CO 2 targets
Technical Paper
1999-29-0011
Sector:
Language:
German
Abstract
A significant improvement in the European air quality can be
achieved through a decrease of particulates matter and carbon
dioxide generated by passenger cars. The congested European cities
require an additional attention to the decrease of ozone forming
pollutants, i.e., nitrogen oxides and reactive hydrocarbons. Large
reductions are also needed from the point of view of benzene and
polynuclear aromatic hydrocarbons emissions.
Being the natural gas Otto cycle engines the most promising
answer in terms of pollutants and carbon dioxide emission
reduction, in recent years European emissions regulations dealing
for the first time with gas engines, applied both to conventional
vehicles and EEVs (Enhanced Environmentally friendly Vehicles and
engines), have been delivered.
The present first generation natural gas engines manufactured by
FIAT are based on sequential multipoint fuel injection and
today's catalysts of conventional gasoline vehicles; with such
technology engines and vehicles are already able to achieve the EEV
targets and to exploit the intrinsic environmental characteristic
of natural gas by respecting at the same time dangerous exhaust
pollutants and severe carbon dioxide constraints.
The second-generation natural gas vehicles will be able to
achieve even lower fuel consumption and emissions through the use
of aftertreatment systems specifically designed for methane and the
development of control strategies able to operate the
stoichiometric or lean-burn engine configurations with the present
wide spread changes of natural gas composition.