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CNG engines for 2000-2010~European pollutants and CO 2 targets
Published September 02, 1999 by AVL List GmbH in Australia
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.