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plug-in transmission

FEV Shows Plug-In Transmission at SAE

April 8, 2014 in Electric Drive, EVs, Hybrids, New Products by Rich Piellisch  |  No Comments

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.”

FEV credits a systematic development process and CAE design methods for a plug-in hybrid transmission that’s 10% lighter, shorter, and less costly to manufacture than a similar dual-clutch transmission.

FEV credits a systematic development process and CAE design methods for a plug-in hybrid transmission that’s 10% lighter, shorter, and less costly to manufacture than a similar dual-clutch transmission.

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



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