Stop-Start Systems Proliferating at Hyundai, VW

Hyundai Motor Co. Ltd. will offer stop-start technology on its U.S. models, while Volkswagen Group will incorporate the micro-hybrid technology as standard equipment across all brands and models with conventional powertrains, the auto makers say.

John Krafcik, CEO of Hyundai Motor America, declines to say which vehicle first will get the technology.

Stop-start shuts off a vehicle's gasoline engine at idle. It differs from a full-hybrid system, which allows the engine to switch off at low speeds while electric motors keep the wheels turning.

HMA plans to retail a full-hybrid version of its next-generation Sonata.

Europe has been the primary market for micro-hybrids, where BMW AG uses the technology in its 1-Series and 3-Series and Mini Cooper range.

At Audi AG, regenerative braking and stop-start technology, plus development work under way to recapture and use heat more effectively, will further enhance conventional powertrain efficiency.

There could be as much as 15%-20% in efficiency gains yet to be made in vehicles with conventional powertrains, says Wolfgang Hatz, head of powertrain development for Volkswagen Group.

Audi's hybrid Q5 cross/utility vehicle is set to launch in late 2010 or early 2011, Hatz says. The Q5 is part of a handful of related moves by Volkswagen Group that includes optional hybrid powertrains for several upcoming VW-brand vehicles, beginning with the next Jetta in 2010.

Audi's HEV system is a modular design that incorporates lithium-ion batteries, ultimately paving the way for plug-in technology. It employs an electric motor to drive the rear axle, while the gasoline engine powers the front axle.