Transportation & Fuel Source Technology
Porsche Reveals Early Stages of New Cayenne Hybrid
Porsche, a company renowned for its
high-performance sports cars and sport utility vehicles (SUV), this week in
Stuttgart demonstrated to the media a Cayenne SUV hybrid prototype, providing
a glimpse of what the company will offer to consumers by the end of the
Porsche is targeting average fuel consumption figures of 9.8 liters/100
kilometers in the New European Driving Cycle and about 24 miles per gallon in
the US FTP cycle for the Cayenne Hybrid, and future developments may allow
Porsche engineers to push towards an average fuel consumption figure of 8.9
liters/kilometer (approximately 26 miles per gallon).
The Cayenne Hybrid will feature a full-hybrid design where the hybrid
module (clutch and electric motor) is positioned between the combustion engine
and the transmission rather than having the hybrid drivetrain branching output
along various lines and in various directions via a planetary gearset. Porsche
selected this design because the in-line configuration of the hybrid
components are more compatible with the existing Cayenne platform, this system
in testing is more fuel efficient, and because this configuration is a better
fit for Porsche as it will provide improved acceleration and engine
flexibility compared to a conventional Cayenne.
Coordinating the car's three main components - the combustion engine, the
electric motor and the battery - is the Hybrid Manager, the heart of the
Cayenne Hybrid. The Hybrid Manager, which oversees some 20,000 data parameters
as compared to only 6,000 data parameters for a conventional engine, is one of
the most powerful technologies found in any hybrid vehicle.
Other unique features of the Cayenne Hybrid designed to decrease fuel
consumption include the power steering and vacuum pump for the brakes, as well
as the air conditioning, which operate on electric power. Technical
components, such as the oil pump in the Cayenne's automatic transmission, have
been replaced by electrically powered units. The Cayenne Hybrid's
electro-hydraulic steering - a first for a vehicle of its kind, will ensure
the Cayenne Hybrid drives like a Porsche with predictable and safe handling
characteristics and the agility that is expected of a Porsche SUV.
plans to introduce similar hybrid technology in a version of its Panamera four-door Gran Turismo. The Panamera will debut in 2009, with a hybrid to follow.
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