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Chrysler, GM, BMW announce new hybrid system - TechAmok
Chrysler, GM, BMW announce new hybrid system - [technology] 04:42 PM EDT - Apr,27 2006 - post a comment
DaimlerChrysler,
BMW, and GM today announced a new full hybrid system that "represents a
major automotive industry milestone due to the unprecedented fully integrated
combination of electric motors with a fixed-gear transmission." The technology
is said to be ready for production beginning next year. As a result of its low-
and high-speed electric continuously variable transmission (ECVT) modes, the
system is commonly referred to as the 2-mode hybrid. However, the sophisticated
fuel-saving system also incorporates four fixed gear ratios for high efficiency
and power-handling capabilities in a broad variety of vehicle applications.
During the two ECVT modes and four fixed gear operations, the hybrid system can
use the electric motors for boosting and regenerative braking.
In summary, the four fixed gears overlay two ECVT modes for a total of six
operating functions:
- Input-split ECVT mode, or continuously variable Mode 1, operates from vehicle
launch through the second fixed gear ratio.
- Compound-split ECVT mode, or continuously variable Mode 2, operates after the
second fixed gear ratio.
- First fixed-gear ratio with both electric motors available to boost the
internal combustion engine or capture and store energy from regenerative
braking, deceleration and coasting.
- Second fixed-gear ratio with one electric motor available for boost/braking.
- Third fixed-gear ratio with two electric motors available for boost/braking.
- Fourth fixed-gear ratio with one electric motor available for boost/braking.
The system has an overall mechanical content and size similar to a conventional
automatic transmission, yet this full hybrid transmission can operate in
infinitely variable gear ratios or one of the four fixed-gear ratios. A
sophisticated electronic control module constantly optimizes the entire hybrid
powertrain system to select the most efficient operation point for the power
level demanded by the driver.
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