Multiple ratio series electric vehicle drivetrain
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United States of America Patent
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Feb 25, 2003
Issued Date -
N/A
app pub date -
Aug 6, 2001
filing date -
Aug 6, 2001
priority date (Note) -
Expired
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Abstract
A series electric drivetrain includes a multiple speed, mechanically-shifted transmission driven by a pair of electric motors. Input power is provided by both electric motors during operation in any given speed ratio, and by only one of the electric motors during shifting between speed ratios. During shifting, the motor not providing input power is released from the output, and accelerated or decelerated to a post-shift speed. When the released motor reaches the post-shift speed, a clutch is synchronously engaged to complete the shift, and the motors resume a shared supply of the transmission input power.
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