US 12,169,015 B2
Hydromechanical transmission and control method
Lorenzo Dalla Palma, Arco (IT); Fabio Gunsch, Arco (IT); Mario Gelmini, Arco (IT); and Giovanni Profumo, Arco (IT)
Assigned to DANA ITALIA S.R.L, Arco (IT)
Filed by DANA ITALIA S.R.L., Trentino (IT)
Filed on Jul. 25, 2023, as Appl. No. 18/358,759.
Application 18/358,759 is a continuation of application No. 17/653,857, filed on Mar. 7, 2022, granted, now 11,754,161.
Prior Publication US 2023/0383827 A1, Nov. 30, 2023
Int. Cl. F16H 61/66 (2006.01); F16H 37/08 (2006.01); F16H 47/04 (2006.01); F16H 61/04 (2006.01); F16H 61/40 (2010.01); F16H 61/438 (2010.01); F16H 61/456 (2010.01); F16H 61/46 (2010.01); F16H 61/47 (2010.01); F16H 61/472 (2010.01); F16H 61/38 (2006.01); F16H 61/50 (2006.01)
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
OG exemplary drawing
 
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.