2009 Dodge Durango HEMI Hybrid

2009 Dodge Durango HEMI Hybrid

Chrysler is entering the hybrid market with two versions of its midsize SUVs. The Dodge Durango and its upscale sibling, the Chrysler Aspen, will both offer a gas-electric hybrid model in 2008. In both models, Chrysler's 5.7-liter Hemi V8 will be integrated with a two-mode hybrid system developed jointly by Chrysler, General Motors, and BMW. The system uses an electric continuously variable transmission (ECVT) that also has four fixed gears, like a traditional automatic transmission. The ECVT transmission incorporates two electric motors, and the system can operate on the electric motors, the Hemi engine, or a combination of the two. The system will also use the electric motors for braking assist and regenerative braking, as well as running accessories such as power steering and air conditioning. In its new hybrid form, the Hemi engine will continue to use Chrysler's Multi-Displacement System cylinder deactivation, which "shuts down" half the engine's cylinders in light cruising to conserve fuel. Chrysler says that the hybrid's electric motor assist will enable the engine to operate more frequently in four-cylinder mode.

The new two-mode system uses an electric continuously variable transmission (ECVT) that also has four fixed gears, like a traditional automatic transmission. With the combination of both hybrid and cylinder deactivation technologies, Chrysler says the system will deliver a 25 percent improvement in overall fuel economy, and a 40 percent improvement in city driving. This would make for 19 mpg in city driving, a commendable figure for a generously sized SUV (a current non-hybrid Durango or Aspen with Hemi power gets about 13 mpg in city driving).Consumer Guide recently took a brief test drive in a prototype Aspen Hybrid at Chrysler's Chelsea Proving Grounds with a Chrysler engineer riding shotgun. During our test, we applied light throttle pressure from a stop, and the Aspen Hybrid ran on electric power only. We were cruising at about 25 mph on the electric motor when we approached a grade in the road. As we ascended the incline, the gas engine then smoothly kicked in to provide extra power for us to maintain the same speed. Overall, the feel from the driver's seat reminded us of the Toyota Prius's hybrid system operation... only scaled up to suit a big SUV instead of a compact car. Chrysler Group is focusing heavily on across-the-board improvement in the fuel economy of its vehicles, and the new SUV hybrids are a key component of that goal. In addition to the forthcoming hybrid models, the 2008 Durango and Aspen will offer an updated version of Chrysler's E85-capable 4.7-liter V-8. The engine produces 303 horsepower (68 more than the previous 4.7 V-8), and Chrysler says it will offer improved fuel economy as well.