Porsche Releases More Cayenne Hybrid Details


porsche_cayenne_s_hybrid_prototyp_feb2009 Porsche shared more information about its Cayenne S Hybrid, which will debut next year. Using a parallel full hybrid design with the electric motor between the combustion engine and the transmission, Porsche engineers have been able to drive at speeds up to 86 mph without at all using the combustion engine.

This engineering achievement allows the Cayenne S Hybrid to roll freely - or 'coast' - at highway speeds without the combustion engine on, greatly minimizing engine emissions and fossil fuel consumption. This differs from current hybrid concepts that deliver benefits mainly in city traffic.

When it comes to market in 2010, the Cayenne S Hybrid is expected to emit some 20 percent less C02 than comparable combustion engine vehicles with similar power output. Covering a 0-to-100 km/h sprint in just 6.8 seconds, it earns its 'S' designation by delivering V8 performance and four-cylinder efficiency, all while complying with the Ultra Low Emission Vehicle II (ULEVII) emission standards.

The Cayenne S Hybrid uses a supercharged Audi 3.0-liter V6 engine with Direct Fuel Injection (DFI), 333 horsepower and 324 lb-ft of torque from 2,900 to 5,300 rpm. It is mated with 52-horsepower three-phase synchronous electric motor that produces up to 221 lb-ft of torque and also acts as an alternator, and the combined power units are joined to an eight-speed automatic transmission. Also on board is a 154-lb. no-maintenance 38 kW nickel metal hydride (NiMH) battery. Measuring 13.7" x 24.9" x 11.5", it fits in the spare tire well, thus not compromising luggage capacity.

The Cayenne S Hybrid also has electrically driven ancillary components such as the air conditioning compressor and the power steering pump.

Unlike conventional Cayenne SUVs, the Cayenne S Hybrid uses an eight-speed automatic unit. Porsche engineers added to the conventional transmission oil pump a new electrical drive pump to shift gears smoothly and efficiently also in electric mode. Top speed comes in sixth gear, and the two higher gears serve to further reduce engine speed to enhance fuel economy. Eighth gear, for example, enables the driver to 'coast' along without the combustion engine at speeds up to 86 mph.

Porsche expects the Cayenne S Hybrid to consume less than nine liters of fuel per 100 kilometers in the New European Driving Cycle. EPA fuel economy figures are not yet available.

A similar hybrid system will find its way into the new Porsche Panamera four-door gran turismo sometime following Porsche's fourth model line debut in late summer 2009.

(Source: Porsche Cars North America)


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