US 12,392,407 B2
System and method for seamless shifting in a dual motor transmission with minimal gears
Pier Paolo Rinaldi, Arco (IT); Giacomo Faggiani, Rovereto (IT); and Mark Slater, Warwickshire (GB)
Assigned to DANA ITALIA S.R.L., Trentino (IT)
Filed by DANA ITALIA S.R.L., Trentino (IT)
Filed on Jan. 30, 2023, as Appl. No. 18/161,790.
Prior Publication US 2024/0255053 A1, Aug. 1, 2024
Int. Cl. F16H 61/04 (2006.01); B60K 1/02 (2006.01); B60W 10/08 (2006.01); F16H 61/688 (2006.01)
CPC F16H 61/0403 (2013.01) [B60W 10/08 (2013.01); F16H 61/688 (2013.01); F16H 2061/0422 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A transmission system of a vehicle, comprising:
an intermediate shaft oriented parallel to both of and offset to each of a first shaft comprising only a first gear mesh and a third gear mesh of a plurality of gear meshes, and a first dog clutch located between the first gear mesh and the third gear mesh and a second shaft comprising only a second gear mesh and a fourth gear mesh of the plurality of gear meshes, and a second dog clutch located between the second gear mesh and the fourth gear mesh;
a first electric motor coupled to the first shaft to enable one of a first reduction ratio of the first electric motor via the first gear mesh and a second reduction ratio of the first electric motor between the first shaft and the intermediate shaft via the third gear mesh; and
a second electric motor coupled to the second shaft to enable one of a first reduction ratio of the second electric motor via the second gear mesh and a second reduction ratio of the second electric motor via the fourth gear mesh between the second shaft and the intermediate shaft; and
a control system with instructions stored in memory and configured to: operate with the first dog clutch engaged to the third gear mesh, the second dog clutch engaged with the fourth gear mesh, a speed of the first electric motor exceeding a speed of the second electric motor, and disconnect the first electric motor via entering a neutral state by disengaging the first dog clutch in response to the first electric motor reaching an overspeed limit prior to the second electric motor and a vehicle speed exceeding a nominal speed.