Porsche wins engineering awards

PORSCHE® IS DOUBLE WINNER OF PRESTIGIOUS PACE AWARDS FOR INNOVATION IN AUTOMOTIVE ENGINEERING Manufacturer takes awards for its collaborative work with BorgWarner on AWD drive system and variable turbine technology ATLANTA, April 17, 2007 ---...

PORSCHE® IS DOUBLE WINNER OF PRESTIGIOUS PACE AWARDS FOR INNOVATION IN AUTOMOTIVE ENGINEERING

Manufacturer takes awards for its collaborative work with BorgWarner on AWD drive system and variable turbine technology

ATLANTA, April 17, 2007 --- Porsche has won two of the prestigious Automotive News PACE Awards, for their work with BorgWarner on the High Energy ITM3e All Wheel Drive System and Variable Turbine Geometry, both of which first appeared in the latest iteration of the iconic Porsche 911 Turbo.

The Automotive News PACE Awards honor superior innovation, technological advancement and business performance among automotive suppliers. This prestigious award, now in its 13th year, is recognized around the world as the industry symbol of innovation. The 23 PACE Award finalists have come from the United States, Canada, Mexico, Brazil, Italy, Spain, France, Belgium, Luxembourg, Switzerland, Germany, Australia and Japan. Automotive News and co-sponsors Microsoft, SAP and TRC Inc. presented this year's awards last night at the Max M. Fisher Music Center in Detroit.

"Porsche is honored to have been part of the development process of these new innovative technologies," said Peter Schwarzenbauer, PCNA President and CEO. "We believe that these two technologies have not only advanced the art of automotive engineering, but have provided a true benefit in the areas of performance and safety to our owners."

Porsche will receive awards in the following categories:

--PACE Collaborator Award to Porsche, for Variable Turbine Geometry (VTG),with BorgWarner Turbo & Emissions Systems

With the introduction of the new 911 Turbo in August of 2006, Porsche became the first manufacturer to successfully offer variable turbine geometry (VTG) in a gasoline-powered vehicle. Available on Diesels since the 1990's, the problem of extremely high exhaust gas temperatures in gasoline-powered applications, up to 1000 C, had proven insurmountable. Porsche, working in concert with BorgWarner Turbo Systems, solved the problem through the use of space technology developed high-temperature resistant materials. Only this technology is able to use the full flow of exhaust gases at all operating RPM ranges of the engine to provide an optimum turbocharging effect.

With its small flow cross-section, a small turbocharger will respond to a low volume of exhaust gases flowing at high speed, especially as the turbine wheel as such is small and light, with a low level of mass to be accelerated. The disadvantage is that flow resistance increases at higher speeds with higher air throughput, building up high counter-pressure and requiring some of the exhaust gas to be diverted through a wastegate or bypass valve.

A large turbocharger, on the other hand, responds poorly at low engine speeds due to its larger cross-section and higher turbine mass while offering the advantage of lower exhaust gas counter-pressure under high air throughput.

Variable turbine geometry serves to alter the cross-sections by way of rotor blades directly in the flow of exhaust gases, providing exactly the right turbocharger size and effect in each situation: At low engine speeds the blades are closed to form small air gaps. Exhaust gases flowing through these small openings are accelerated and hit the turbine wheel with a high level of energy in a radial direction, like on a small turbocharger. When the exhaust gas flow increases as a function of engine speed, the rotor blades progressively open increasing the turbocharger pressure accordingly.

The engine's Motronic "brain" along with the electrically driven adjuster mechanism, allow the rotor blades to open and close within about 100 milliseconds. This technology renders the here-to-fore mandatory bypass valve, superfluous; allows for more efficient intercooling thus providing higher power and torque.

--PACE Collaborator Award, for Porsche Traction Management (PTM), with BorgWarner TorqTransfer Systems

The design, engineering, and realization of an innovative AWD system means optimizing traction and driving dynamics. Porsche's objective was to replace passive viscous coupling with a low-weight, network-capable, active, electronically-controlled system to provide improved traction, increased safety, good handling, and a confident driving experience. Porsche's collaboration with BorgWarner TorqTransfer Systems resulted in Porsche Traction Management (PTM), a dynamic mechanical system, with active gerotor pump, thermal management, and new all-wheel drive control algorithms for a high-performance sports car.

The Porsche 911 Turbo AWD system has unique performance requirements. The front and rear wheels turn at slightly different speeds. While providing some AWD benefits, the typical passive viscous coupling system provides limited compatibility with today's advanced electronic stability systems. Porsche was searching for a system that provided outstanding AWD dynamic improvements, but compatible with its advanced stability systems, while not negatively affecting performance, power use or energy consumption.

The key component in the Porsche active all-wheel drive system is the newly developed multi-plate clutch assembly, housed within the front axel transmission. This clutch assembly is unique in that it is controlled not by hydraulics or by means of mechanical actuators, but by electromagnets.

A special Porsche Traction Management (PTM) computer controls the clutch mechanism by communicating with several important systems within the car to determine wheel speed, forward and lateral acceleration as well as steering angle. The computer then adjusts the clutches in 100 milliseconds or less, thus applying the appropriate amount of power to the proper axel.

-credit: porsche

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