DaimlerChrysler, GM Collaborate on Hybrids

Motor,  Feb 2005  by Nash, Tom

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After lagging behind the rest of the industry in hybrid development, DaimlerChrysler and General Motors now plan to work together to develop a "two-mode" full hybrid propulsion architecture for applications in GM, Chrysler and Mercedes vehicles.

The system is essentially an electrically variable transmission with two hybrid drive modes. It will reduce fuel consumption at highway speeds much more effectively than currently used single-mode systems and is expected to achieve at least a 25% improvement in composite fuel economy in full-size truck applications. Single-mode systems rely on much larger electric motors than are needed in the two-mode system. Packaging is more efficient than single-mode designs, as the system's compact and powerful electric motors are designed to fit within the approximate space of a conventional automatic transmission.

Planned applications include rearand front-drive cars, trucks and other vehicles. This technology is expected to significantly improve acceleration performance while also improving vehicle fuel economy and range.

The two-mode full hybrid drive system will be mated to different engines, and the respective vehicle programs will have unique performance dynamics and calibrations. Each company will integrate the two-mode full hybrid into its own vehicles. GM's first application of the system will be launched in late 2007 on two of its most popular full-size SUVs-the Chevrolet Tahoe and GMC Yukon. Chrysler's first application will be in the Dodge Durango shortly following the debut of the GM sport/utes. Mercedes-Benz will focus on hightech hybrid propulsion systems in rear-drive passenger cars in the luxury segment.

Copyright Hearst Business Publishing Feb 2005
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