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Fiat Third-Generation Di Diesel Engines
Published January 01, 1998 by Institution of Mechanical Engineers in United Kingdom
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