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Fiat Third-Generation Di Diesel Engines
Technical Paper
984004
Sector:
Language:
English
Abstract
An outlook is given to the major characteristics of the new
4-cylinder and 5-cylinder diesel engines that Fiat is going to
introduce in the passenger car market, starting from beginning
'98 on the Alfa Romeo 156JTD model.
These direct injection diesel engines will offer high torque and
power density, low noise and exhaust emissions, while maintaining
the well-known advantage in terms of fuel economy of this
combustion system.
Basically these improved overall performances have been achieved
thanks to the availability for mass production of the UNIJET
common-rail fuel injection system, with fully flexible
(electronical) control of the relevant injection parameters.
This breakthrough technology allowed to solve the problem of
noise and comfort that limited till now the appearance of DI diesel
engines in passenger cars, mainly in the low displacement
range.
Further developments are in progress to introduce in the near
future a new cylinder head architecture, with 4 valves per cylinder
together with common-rail injector in a vertical position, as well
as a small DI diesel, with unit displacement reduced to 300
cm3.
These efforts are mainly focused to meet the demand of lower
exhaust emissions and improved fuel economy (3-liter car), foreseen
at the beginning of the next century.
Further exploitation of common-rail potentials, combustion
system optimization, advanced cooled EGR, DENOx catalyst and fuel
quality are the major technological items to be considered in order
to meet the Euro 4 emission standards with these third-generation
DI diesel engines