Interrelated power delivery controls – including engine control – Electric engine – With transmission control
Reexamination Certificate
2009-03-17
2011-11-29
Phan, Hau (Department: 3618)
Interrelated power delivery controls, including engine control
Electric engine
With transmission control
C477S046000, C477S049000
Reexamination Certificate
active
08066617
ABSTRACT:
A method of controlling an automated step-down transmission, arranged in a drivetrain between an engine and a drive axle, which includes a multi-stage main transmission and a range group. The main transmission has an intermediate transmission style with a countershaft having a transmission brake and an input shaft connected, via a clutch, to the engine. The main transmission shifts, without being synchronized, and the range group shifts, after synchronization, such that the engaged gear ratio of the main transmission remains engaged during a range shift operation. The range shift is accomplished by firstly reducing drive engine torque; secondly, disengaging the existing gear ratio of the range group; thirdly, remotely synchronizing the target gear ratio in the range group; fourthly, engaging the target gear ratio in the range group; and fifthly, increasing the drive engine torque.
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Breuer Jochen
Steinborn Mario
Davis & Bujold P.L.L.C.
Phan Hau
ZF Friedrichshafen AG
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