Continuously variable power split transmission (CVPST) system for use in a hybrid vehicle
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United States of America Patent
Stats
-
Feb 8, 2005
Grant Date -
May 6, 2004
app pub date -
Oct 29, 2003
filing date -
May 26, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A continuously variable power split transmission (CVPST) system is described for use in a hybrid vehicle. The vehicle has a first motor, such as an internal combustion (IC) engine and a second motor, such as an electric motor. The system has a step-up gearbox for providing additional fixed speed ratios to extend overall transmission conversion range (CR) of the system. The system also has a speed variator and a countershaft being operatively connected to the second motor of the vehicle so that any power input applied by the second motor to the countershaft reduces the power flowing through the speed variator. Also, an adjustment of the variator speed ratio i.sub.v allows a passage from underdrive i.sub.UD to overdrive i.sub.OD range of speed ratios in the step-up gearbox to be synchronized.
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