GRI-G4  EN27, EN7
This content was subject to assurance by SGS Italia S.p.A. (14 March 2014).

Optimization of the ecological performance of engines

Conventional engines will continue to play a predominant role in mobility in coming years. 

The Group believes that there is still significant potential to reduce the fuel consumption and emission levels of these engines through innovative technological solutions.

Gasoline engines

The two-cylinder TwinAir engine, which  emits up to 30% less CO2compared with engines of similar performance (16V 1.4-liter gasoline version), continued to be rolled out in further models. The TwinAir family features four engine versions: a naturally aspirated 65 hp, 85 hp and 105 hp turbo, and an 80 hp natural gas turbo. The Group offers these on 31% of cars offered in Europe. The new Twinair105 hp turbo version includes improved engine architecture (Cylinder Head Integrated Manifold - CHIM) and a high-efficiency turbocharger, thus further reducing fuel consumption and emissions.  After its introduction on the Fiat 500L in 2012, it is now available on the Fiat 500 and 500C, Fiat Punto and Alfa Romeo MiTo.

MultiAir technology lies at the heart of the TwinAir engines. Its electro-hydraulic valve management system reduces fuel consumption by controlling air directly via the intake valves without using the throttle. Improved combustion control allows MultiAir to reduce polluting emissions, while simultaneously enhancing performance by improving drivability.  Compared with a traditional gasoline engine of equal displacement, MultiAir engines increase power by up to 10% and torque by up to 15%, in addition to a significant reduction in CO2 emissions of up to 10%.

The Group has already developed the new and improved MultiAir II, featuring next generation intake valve management and combustion control, thus enabling a further reduction in CO2 emissions without compromising performance, drivability or customer satisfaction.

All the gasoline engines in the TwinAir family and the 170 hp FIRE Turbo engine now feature MultiAir II technology.  MultiAir II technology has also been extended to all Tigershark engines including the new 2014 Jeep Cherokee. This vehicle comes equipped with a 2.4-liter MultiAir II Tigershark I-4 producing 184 horsepower and 171 lb.-ft. of torque. It achieves a fuel economy rating of up to 31 miles per gallon (mpg) highway for 4x2 models, a more than 45% improvement versus the outgoing model. This same powertrain is standard on the new 2015 Chrysler 200, and contributes to estimated fuel economy improvements of 13% compared with the outgoing model.

The Group's  Pentastar V-6 engine, originally launched on the Jeep Grand Cherokee in 2010, was expanded during 2013 with the addition of two new downsized versions: a 3.2-liter V-6 in the all-new 2014 Jeep Cherokee and a 3.0-liter V-6 in the 2014 Jeep Grand Cherokee sold in China.  With these two introductions, the Pentastar engine family now accounts for all of Chrysler Group V-6 offerings, powering 16 models across 11 segments - from mid-size car to full-size commercial van. The Pentastar V-6 engine has a flexible architecture, so it can be used with a variety of advanced technologies, such as Fiat’s MultiAir, direct injection or turbocharging. This "plug-and-play" characteristic, with little or no modification, accommodates longitudinal and transverse orientations; front-wheel, rear-wheel, all-wheel and four-wheel-drive systems; 6-speed manual transmissions and 6-, 8- and 9-speed automatic transmissions.

In 2013, cars equipped with MultiAir technology represented 14.6% of all Mass-Market and Premium Brand sales in Europe.

Research into gasoline engines has been aimed at developing solutions to ensure ever-higher performance and extremely low polluting emissions. These solutions are the result of a range of complementary technologies, such as modern supercharging systems incorporating new features developed in the MultiAir system and the use of exhaust gas recirculation systems. These are all solutions that make engine management more flexible while increasing fuel economy and cutting emissions. New engines can deliver the torque needed even at low engine speeds and will lead to the introduction of specific solutions to adapt transmission performance, favoring downspeeding and resulting in even better fuel economy. Vehicles featuring these innovations will be more competitive while offering customers low ownership costs matched with top performance.

Chrysler Group is engaged in a cooperative project involving the MultiAir system in collaboration with the US Department of Energy. In partnership with academia, suppliers and laboratories, this project aims to help accelerate the development of highly efficient engine and powertrain systems for light-duty vehicles, while meeting future emissions standards.  Key research activities related to improved efficiency include reduced engine displacement, direct injection, advanced boosting systems that incorporate series/sequential turbocharging and cooled Exhaust Gas Recirculation (EGR). 

Diesel engines

Our technological leadership in the field of diesel engines was strengthened by the second generation MultiJet technology (MultiJet II), an evolution of the revolutionary Common Rail injection system patented by Fiat (Unijet). This technology has spread across the world, and testifies to Fiat's commitment to developing solutions that are accessible to a large number of customers. The MultiJet 1.3-liter version alone reached the historic milestone of five million units produced at the Bielsko Biala (Poland) plant. MultiJet II engines are characterized by their eco-efficiency and performance through advanced combustion optimization technologies such as Injection Rate Shaping (IRS). With IRS, the MultiJet’s typical main injection is replaced by two consecutive injections with no hydraulic interval, generating significant improvements in terms of fuel consumption (up to 3% less) and harmful emissions (a potential 20% reduction in NOX). In 2013, the MultiJet II was further extended across the product range, with the launch of the new 120 hp 1.6-liter version on the Fiat 500L, 500L Trekking and 500L Living and of the new 150 hp 2.0-liter version on the Alfa Romeo Giulietta.

The Group's recently-launched V-6 EcoDiesel engine was adapted specifically for the North American market to meet the NAFTA region's stringent emissions and on-board diagnostic regulations. This engine is available in all 50 US states and is Tier 2/bin 5 compliant.  It benefits from Fiat’s MultiJet II technology, which enables Injection Rate Shaping - fuel injection that is modulated to mitigate noise and improve low-speed throttle response, while reducing fuel consumption and emissions.

The EcoDiesel-powered 2014 Ram 1500 has earned a 28 miles per gallon (mpg) rating from the US Environmental Protection Agency (EPA), the best highway-cycle test result ever achieved by a full-size, half-ton pickup. The new diesel engine also enables the 2014 Jeep Grand Cherokee to achieve best-in-class 30-mpg performance on the highway. The 3.0-liter EcoDiesel V-6 engine was named among Ward's 10 Best Engines for 2014 and contributed to the 2014 Ram 1500’s victory in the latest Motor Trend Truck of the Year competition.

In the US, the Selective Catalytic Reduction (SCR) after-treatment system is provided on the Ram Heavy Duty diesel trucks, as well as on the new EcoDiesel engine in the Jeep Grand Cherokee, Ram 1500 and Promaster. SCR provides a robust solution for managing NOX emissions while improving fuel economy.

Diesel Engines

Research into diesel engines has been focused on further developing the injection and combustion process with the aim of improving engine performance and reducing noise. In addition, the research also aims to study and develop innovative ways to minimize polluting emissions, including nitrogen oxides, in anticipation of future mandatory requirements.