Unit Includes Two-Speed Pure Electric Driving Mode
FEV North America is talking up its advanced designs for cars with smaller engines and correspondingly smaller transmissions with “higher levels of capability in a smaller package that can be used in a downsized engine compartment.”
The firm says it took “a clean sheet approach to develop a transmission with such capability.”
FEV is promoting the new plug-in hybrid transmission at the SAE World Congress in Detroit this week. The unit features a two-speed pure electric driving mode. It can be used with an internal combustion range extender in parallel mode for efficient highway driving, and has a flexible eCVT mode (power split) with strong launch performance and no clutch slippage.
Just One Motor
The transmission does not use a torque converter and includes only one electric machine, FEV says.
The design process was supported by advanced CAE methods, the company adds, with in-house software. Calibration was optimized using FEV’s proprietary TOPexpert tool.
“The result is a state-of-the-art transmission that is low in complexity, yet enables a high degree of vehicle functionality,” the company says, including
- electric drive mode with two ratios;
- full hybrid functionality including e-boost and regen;
- superior launch performance using either internal combustion engine or e-motor;
- creep behavior similar to conventional automatic transmissions; and
- “excellent fuel economy enabled by elimination of torque converter and use of a highly efficient parallel mode of operation.”
The transmission is 10% lighter, shorter and less costly to manufacture than a similar dual-clutch transmission, FEV says. It is “package-neutral and offers very low complexity and a high degree of robustness.”
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Source: FEV North America with Fleets & Fuels follow-up