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Global Hybrid Cooperation (formerly called Advanced Hybrid System 2 or AHS2) is a set of hybrid vehicle technologies jointly developed by General Motors, Daimler, and Chrysler LLC, with BMW joining in 2005. It uses 2 or 3 planetary gearsets in an automatic transmission: one on the internal combustion engine side (''input split'') paired with a second (''output split''), forming the compound split, and possibly one third additional planetary gearset to multiply the number of fixed gear ratios (up to 4). General Motors has stopped using the "AHS2" name as of 2006, preferring to call it simply a "two-mode hybrid system". This technology was named as "Technology of the Year" for 2007 by Automobile Magazine.〔"(FEATURES: Technology of the Year: GM's Two-Mode Hybrid System )", Don Sherman, Automobile Magazine, December 27, 2007〕 While Toyota's Hybrid Synergy Drive may appear similar in that it also combines the power from an Internal combustion engine (ICE) and a pair of electric motor-generators; however in its current form, Toyota uses only one planetary gearset providing only single mode functionality (i.e. ''input split only'') using a (series/parallel ) architecture. While, Honda's Integrated Motor Assist uses a traditional ICE and transmission where the flywheel is replaced with an electric motor: it is a simple (parallel ) architecture, requiring the addition of a mechanical continuously variable transmission. (i.e. not electrically variable) ==Cooperation== The GM/DaimlerChrysler partnership was announced on December 13, 2004 with Dieter Zetsche of DaimlerChrysler joining Rick Wagoner of GM on stage with a prototype. The agreement was not signed until the following August, however. GM is reportedly responsible for development of rear- and four-wheel drive truck and front wheel drive car systems while DaimlerChrysler is focused on a rear wheel drive luxury car application. It was announced on September 7, 2005 that BMW would also join the alliance, likely using archrival DaimlerChrysler's rear wheel drive system. The three companies have formed an organization called Global Hybrid Cooperation with engineering and management centered at the GM, DaimlerChrysler and BMW Hybrid Development Center in Troy, Michigan. Recent reports indicate that the three automakers will spend one billion US dollars between them on the development of the front- and rear-wheel drive hybrid transmissions.〔(【引用サイトリンク】title=Spending to Go Green )〕 On March 1, 2007, BMW and DaimlerChrysler announced that they are expanding their partnership and moving quickly to develop a mild hybrid module for rear wheel drive premium cars. They plan to roll out the new system within the next three years on BMW and Mercedes-Benz vehicles produced. In 2009 Mercedes released the S400 hybrid using a lithium ion battery. GM is not part of this expanded partnership, and has not announced plans to develop a hybrid RWD system for cars.〔(BMW and DaimlerChrysler Rev Up Development of Premium Hybrid Cars )〕 It was reported in July 2009, however, that after the upcoming introductions of two-mode versions of the BMW X6 globally and the Mercedes-Benz M class only in the United States, the joint venture would be dissolved. Daimler indicated that it wants to avoid investing in aftersales and service for a vehicle which will only be produced in small quantities, and will instead concentrate on modular hybrid building blocks with scalable lithium-ion batteries, based on the hybrid drive developed for the S-class and 7-series sedans in another joint venture with BMW and auto supplier Continental AG.〔"(BMW, Daimler, GM hybrid alliance nears end )", Matthias Krust, Automotive News, July 14, 2009〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Global Hybrid Cooperation」の詳細全文を読む スポンサード リンク
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