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PHOTO CAPTION: VW Golf is equipped with Sanyo battery pack that gives it 30 miles of AER.

Volkswagen Testing Chevy Volt Competitor

The 1.4 liter diesel engine in VW's Twin Drive system actually drives the wheels, whereas the engine in the Volt only charges the battery as it approaches depletion.

Published: 02-Oct-2008

kswagen is moving right along with its plan to put a plug-in hybrid on the road by 2011, road-testing a "Twin Drive" Golf that goes 30 miles on lithium-ion battery power alone.

The proof-of-concept test mule roaming Berlin uses a diesel-electric drivetrain, but VW says the production model will ditch the 1.4-liter turbodiesel in favor of a 1-liter turbocharged gasoline engine. Although the VW engineers discussing Twin Drive during the debut of the sixth-generation Golf called the engine a "range extender" -- the same term GM uses for the gasoline engine in the Chevrolet Volt -- it's not.

The engine in VW's Twin Drive system actually drives the wheels, whereas the engine in the Volt only charges the battery as it approaches depletion. Be that as it may, the plug-in Golf runs on electricity alone to about 30 mph, at which point the engine takes over, according to the engineers who told Motor Trend about the system.

Twin Drive ditches the transmission, a move that helps compensate for the weight of the electric motor and the 350-pound Sanyo battery pack mounted under the trunk. The electric motor provides sufficient torque to get the car moving up to 30 mph, at which point the engine takes over with a single gear ratio roughly equivalent to top gear in a conventional car. The electric motor also provides additional oomph for hard acceleration.

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