Planetary gear transmission systems or components – Input from independent power sources – Including electric motor input
Reexamination Certificate
2005-12-22
2008-08-26
Estremsky, Sherry (Department: 3681)
Planetary gear transmission systems or components
Input from independent power sources
Including electric motor input
C475S149000, C903S910000, C192S003520
Reexamination Certificate
active
07416501
ABSTRACT:
A single range, electrically variable transmission (EVT) is provided with a lockup clutch that reduces motor power requirements. When applied, the lockup clutch allows engine torque to be transmitted directly to the output without the necessity of a motor/generator supplying reaction torque. With the lockup clutch applied, the transmission operates with zero electro-mechanical power flow at a fixed mechanical ratio, thus mitigating the power peak which occurs through the motor/generators. Input-split, output-split, and compound-split transmissions are disclosed. A method of operating an EVT with a lockup clutch is also provided.
REFERENCES:
patent: 6146302 (2000-11-01), Kashiwase
patent: 6527658 (2003-03-01), Holmes et al.
patent: 6953409 (2005-10-01), Schmidt et al.
patent: 2006/0128513 (2006-06-01), Tata et al.
Alan Glen Holmes, Electrically Variable Transmissions for Hybrid Vehicles, Thesis, Ohio State University, Mar. 24, 2000, pp. 58-59.
Holmes Alan G.
Klemen Donald
Nitz Larry T.
Schmidt Michael R.
Estremsky Sherry
General Motors Corporation
Young Edwin A
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