Қос режимді гибридтік технологиялар жиынтығы

Set of hybrid vehicle technologies
Global Hybrid Cooperation, formerly Advanced Hybrid System 2 (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 (ICE) 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.

The dual mode hybrid concept, as described in 1994, was developed to optimize vehicle efficiency by switching between parallel and series hybrid operation, taking advantage of series operation in stop and go traffic to minimize engine speed variance, and parallel operation at highway speeds to use efficient mechanical transmission. On September 30, 1993, the United States Department of Energy signed a contract with General Motors to develop and demonstrate hybrid electric powertrains for light duty vehicles. AHS 2 was derived from a dual mode hybrid system developed earlier by Allison Transmission, then a division of GM, for transit buses. The Allison system first had been announced for buses in 2003.

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. Negotiations had begun earlier in October, after engineering managers at both companies discovered they were independently working on similar dual mode hybrid concepts while participating on the same conference panel. The agreement was not signed until the following August, however. The three companies formed an organization called Global Hybrid Cooperation with engineering and management centered at the GM, DaimlerChrysler and BMW Hybrid Development Center in Troy, Michigan.

The two mode hybrid system was introduced to the light duty vehicle market as a drivetrain option for the 2008 model year Chevrolet Tahoe and GMC Yukon, with an observed improvement in fuel economy of 27–58% compared to a conventionally powered equivalent. GMC Sierra, and Cadillac Escalade. The largest improvement was in the EPA city rating. The dual mode hybrid equipment added approximately , but this increase was offset completely by lighter seats, wheels, and 12 volt battery; aluminum engine and body components; and eliminating the starter motor. It was equipped with a 6.0L LFA and LZ1 V 8 engines featuring Active Fuel Management, which was larger than the standard 5.3L LY5 base engine. BMW and Mercedes introduced the X6 ActiveHybrid and ML450 Hybrid, respectively, in 2009, but these were discontinued in 2011.