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REPORT: GM working on four mode hybrid system

by Sam Abuelsamid (RSS feed) on Aug 17th, 2009 at 7:55AM

Our friend Mike Levine over at spent some time talking to General Motors' John Turzewski about the future of the company's hybrid trucks last week and came away with some interesting information. As we know, the key to GM's two-mode hybrid system is a pair of planetary gear sets that allow blending of engine and electric drive over two different speed speed ranges. This is part of what allows the system to get better fuel economy at highway speeds. The other main difference from competitor's systems is the presence of clutches that allow the gear sets to be locked to... Read More

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