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A Novel Seamless 2Speed Transmission System (一种新型无缝2Speed传输系统)
A Novel Seamless 2-Speed
Transmission System for
Electric Vehicles: Principles and
Simulation Results
Fabio Viotto, Oerlikon Drive Systems
Electronic Systems for Vehicle Propulsion Symposium
8-9 November 2011
Troy (Detroit), MI
1
Presentation Outline
• Introduction
• Why a 2-speed Transmission for Electric Axles?
• The Novel Transmission Layout
• The Model and the Controller
• Results
• Conclusions
Introduction High performance car
transmissions
Automotive
Products 4WD car power transfer
units and differentials
Electric vehicles gearboxes
and transaxles
Why a 2-Speed Transmission for
Electric Axles?
Wheel Torque Performance benefit of a 2-speed transmission (higher
torque in 1st gear and higher speed in 2nd gear)
Constant torque region
Constant power region
Operating
area with
single-speed
Base speed Vehicle Speed
Why a 2-Speed Transmission for
Electric Axles?
The optimisation of the
NEDC 2nd gear ratio permits to
increase the overall
efficiency of the electric
powertrain
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