Two-mode electrically variable transmission

Details Two-mode electrically variable transmission Two-mode electrically variable transmission

2011-05-17

2011-05-17

Ho, Ha D. (Department: 3655)

Planetary gear transmission systems or components

Input from independent power sources

Including electric motor input

Reexamination Certificate

active

07942776

ABSTRACT:
An electrically variable transmission (EVT) is provided with input member and output member, first and second motor/generators, a first and a second planetary gear set, and a final drive gearset. Two torque-transmitting mechanisms that are selectively engagable alone or in different combinations to establish an electric-only operating mode, an input split mode, a compound split mode, and a neutral mode. The first torque-transmitting mechanism may be configured as a one-way clutch in parallel with a friction clutch or a dog clutch, or configured as a lockable one-way clutch. A vehicle having the EVT may be driven electrically using one or both motor/generators, up to a maximum speed of the motor/generators. There are no slipping clutches when operated in an electric-only operating mode, and the engine provides most of the power for high-speed cruising. The EVT can transition from input split mode to compound split mode by synchronous shift.

REFERENCES:
patent: 5577973 (1996-11-01), Schmidt
patent: 5931757 (1999-08-01), Schmidt
patent: 6527658 (2003-03-01), Holmes et al.
patent: 7220203 (2007-05-01), Holmes et al.
patent: 7278941 (2007-10-01), Holmes et al.
patent: 7300374 (2007-11-01), Bucknor et al.
patent: 7416501 (2008-08-01), Holmes et al.
patent: 7473199 (2009-01-01), Bucknor et al.

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