CPC F16H 47/04 (2013.01) [F16H 61/40 (2013.01); F16H 61/46 (2013.01); F16H 61/47 (2013.01); F16H 61/472 (2013.01); F16H 61/66 (2013.01); F16H 2047/045 (2013.01); F16H 61/38 (2013.01); F16H 61/438 (2013.01); F16H 61/456 (2013.01); F16H 61/50 (2013.01); F16H 2061/6603 (2013.01); F16H 2061/661 (2013.01); F16H 2200/2005 (2013.01)] | 19 Claims |
1. A transmission system operating method, comprising:
asynchronously shifting between a first pair of drive ranges in the transmission system via operation of two clutches and a variable displacement hydraulic pump in a hydrostatic assembly;
wherein the asynchronously shifting includes multiple phases that are sequentially implemented;
wherein the hydrostatic assembly is torque controlled during a preparation phase and an incoming clutch engagement phase; and
wherein the hydrostatic assembly is speed controlled in at least a portion of one of the multiple phases that occurs after the preparation phase and prior to the incoming clutch engagement phase.
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