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25th August 2005 Home: Automotive & Design News: Technology: Multi-Displacement System from Chrysler

Multi-Displacement System from Chrysler

MDS allows fuel saving by shutting down part of the engine through cylinder deactivation

The Chrysler Group Multi-Displacement System (MDS) is a fuel-saving cylinder deactivation
technology that is here today — customers get the power and capability of the HEMI® V-8 that
they desire with an improvement in fuel economy of up to 20 percent.

“By 2007, Chrysler Group will have nearly one-million vehicles on the road with MDS,” said
Eric Ridenour, Executive Vice President – Product Development, Chrysler Group. “And 60
million gallons of fuel will be saved annually with the HEMI engine’s MDS technology.”
Chrysler Group is now the first to offer MDS in a pickup truck – the 2006 Dodge Ram 1500. The
company was the first to offer cylinder deactivation in an SUV with the introduction of MDS in
the 2005 HEMI-powered Jeep® Grand Cherokee. It was also the first to offer modern, large volume
vehicles in North America with cylinder deactivation — the HEMI-powered 2005 Chrysler
300C and Dodge Magnum R/T went on sale in the spring of 2004 with the Chrysler Group MDS.

The Chrysler Group MDS seamlessly alternates between smooth, high-fuel-economy four cylinder
mode when less power is needed, and V-8 mode when more power from the 5.7L
HEMI engine is in demand. This optimizes fuel economy when V-8 power is not required,
without sacrificing vehicle performance or capability.

The MDS was part of the engine's original design. This resulted in a cylinder-deactivation
system that is elegantly simple and completely integrated into the engine design. The benefits
are fewer parts, maximum reliability and lower cost.

Some of the significant technologies enabling the Chrysler Group MDS are the speed of
electronic controls, the sophistication of the algorithms controlling the systems and the use of
Electronic Throttle Control. The HEMI can seamlessly transition from eight cylinders to four in
40 milliseconds (0.040 seconds).

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