The newly developed 1.8 ltr gasoline DI Turbo-Jet engine extends the gasoline product portfolio of Fiat Powertrain Technologies after the successful launch of the 1.4 l T-jet engine family in 2007. FPT retains the turbo downsizing concept the most efficient measure to meet the required reduction of CO2 emissions enhancing in the meantime the fun to drive characteristics of the gasoline engine, with the aim to equal at least those of DI turbo diesel units. The adoption of the turbocharger permits as well to differentiate the engines by tuning according to the brand requirements of the various Fiat Group car platforms. The common mechanical base is ideal to provide both the best thermodynamic efficiency and the cost advantages given by the production volumes. Thanks to the direct injection, the double continuously variable cam phasing and turbo charging the new 1.8 ltr DI Turbo-Jet engine develops high specific maximum torque and power values: the HP variant reaches nearly 200 Nm/l and 100 kW/l. The excellent low end torque and fast turbo response are obtained by newly developed advanced EMS scavenging strategies. The final result is highlighted by the 23.1 bar BMEP value at 1400 rpm for the Soft version which is the benchmark today for all gasoline turbocharged engines on the market. Emission levels meet the new Euro 5 standards with a large margin thanks to multiple injection and high pressure stratified charge start strategies even using a packaging friendly low volume close coupled catalytic system. To reach the stringent NVH requirements the engine is mechanically optimised by adopting a slightly over square bore/stroke ratio, a long conrod, a moderate rated engine speed and low alternating masses. Excellent results are obtained which equal those of competitor engines without the use of secondary order balancing shafts.
The new 1.8 l DI turbo-jet gasoline engine from Fiat Powertrain Technologies
Der neue 1.8 l DI Turbo-Jet Ottomotor von Fiat Powertrain Technologies
2008
28 Seiten, 25 Bilder, 5 Tabellen, 8 Quellen
Conference paper
Storage medium
English
The new 1,8 l DI Turbo Jet gasoline engine from Fiat Powertrain Technologies
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