Synchronous shift execution for hybrid transmission

Details Synchronous shift execution for hybrid transmission Synchronous shift execution for hybrid transmission

2011-03-15

2011-03-15

Keith, Jack (Department: 3663)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S001000, C701S052000, C701S055000, C701S056000, C701S058000, C701S061000, C701S062000, C701S064000, C477S003000, C477S005000, C477S006000, C477S007000, C477S008000, C477S014000, C477S015000, C477S016000, C477S017000, C180S065100, C180S065210, C180S065235, C180S065600, C180S065700

Reexamination Certificate

active

07908063

ABSTRACT:
An apparatus and method are provided to execute synchronous shifting in a powertrain system having multiple torque-generative devices each operable to independently supply motive torque to the transmission device. The exemplary transmission device comprises a two-mode, compound-split, hybrid electro-mechanical transmission. Operation includes operating in an initial fixed gear ratio, operating the transmission in a mode operation, and, operating the transmission in a final fixed gear ratio. The control system reduces reactive torque of a clutch activating the initial gear, and deactivates the first torque-transfer device when the reactive torque is less than a predetermined value. It determines that speed of an input shaft to the transmission is substantially synchronized with a rotational speed of the second torque-transfer device, and actuates the second torque-transfer device.

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