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US 12,305,748 B2Granted
Two speed automatic transmission with a friction and dynamically controllable one way clutch for power shifting in an electric vehicle
AssigneeDana Graziano S.R.L.
InventorsFabio Filippo Irato, Alessio Anzaldi, Harish Mathiazhagan
Life of this patent
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Abstract
A transmission system for a vehicle, comprising a dynamic controllable clutch (DCC) and a friction clutch. The transmission system may further comprise a controller comprising instructions stored in non-transitory memory that are executable by the controller to adjust a state of the DCC and a state of the friction clutch to selectively engage a first gear ratio and a second gear ratio for providing torque transfer from an input to an output of the transmission system.
Claims19
A transmission system for a vehicle, comprising:
- an input configured to couple to a prime mover of the vehicle;
- a first gear ratio;
- a second gear ratio;
- a dynamic controllable clutch (DCC);
- a friction clutch;
- a transmission output;
- and
- a controller comprising instructions stored in non-transitory memory that are executable by the controller to:
- adjust a state of the DCC and a state of the friction clutch to selectively engage the first gear ratio and the second gear ratio for providing torque transfer from the input to the transmission output of the transmission system;
- wherein the DCC and the friction clutch are the only clutches of the transmission system for the vehicle, and wherein adjusting the state of the DCC includes activating one or more coils;
- wherein the DCC is a selectable one-way clutch that includes the one or more coils that are configured to independently cause a forward strut and a reverse strut to selectively engage and disengage an output of the DCC in different operating modes;
- wherein the output in the DCC is coupled to a drive gear;
- wherein the forward strut and the reverse strut are hingingly coupled to an input of the DCC;
- wherein, during engagement of the forward strut, torque transfer from the input of the DCC to an output of the DCC occurs in a first rotational direction and is prevented in a second rotational direction;
- and
- wherein, during engagement of the reverse strut, torque transfer from the input of the DCC to the output of the DCC occurs in the second rotational direction and is prevented in first rotational direction.
13 more elements
A transmission system for a vehicle, comprising:
- an input configured to couple to a prime mover of the vehicle;
- a first gear ratio;
- a second gear ratio;
- a dynamic controllable clutch (DCC);
- a friction clutch;
- a transmission output;
- and
- a controller comprising instructions stored in non-transitory memory that are executable by the controller to:
- during a first condition,
- operate the DCC in a first mode in which the DCC is in an engaged state, and transfer torque from the input to the output via the DCC while maintaining the friction clutch disengaged;
- wherein the DCC and the friction clutch are the only clutches of the transmission system for the vehicle, and wherein adjusting the state of the DCC includes activating one or more coils;
- wherein the DCC is a selectable one-way clutch that includes the one or more coils that are configured to independently cause a forward strut and a reverse strut to selectively engage and disengage an output of the DCC in different operating modes;
- wherein the output in the DCC is coupled to a drive gear;
- wherein the forward strut and the reverse strut are hingingly coupled to an input of the DCC;
- wherein, during engagement of the forward strut, torque transfer from an input of the DCC to an output of the DCC occurs in a first rotational direction and is prevented in a second rotational direction;
- and
- wherein, during engagement of the reverse strut, torque transfer from the input of the DCC to the output of the DCC occurs in the second rotational direction and is prevented in first rotational direction.
14 more elements
A transmission system for a vehicle, comprising:
- an input configured to couple to a prime mover of the vehicle;
- a first gear ratio;
- a second gear ratio;
- a dynamic controllable clutch (DCC);
- a friction clutch;
- a transmission output;
- and
- a controller comprising instructions stored in non-transitory memory that are executable by the controller to:
- operate in second gear with the DCC in an open mode while delivering torque from the input to the output via the friction clutch and the second gear ratio, wherein the DCC is in a completely disengaged state in the open mode, and wherein the friction clutch is in an engaged state in the second gear, and
- transition from operating in the second gear to operating in first gear, wherein the transition includes:
- transitioning the DCC from the open mode to a one-way clutch (OWC) mode, and then transitioning the DCC from the OWC mode to a locked mode;
- wherein the DCC and the friction clutch are the only clutches of the transmission system for the vehicle, and wherein adjusting the state of the DCC includes activating one or more coils;
- wherein the DCC is a selectable one-way clutch that includes the one or more coils that are configured to independently cause a forward strut and a reverse strut to selectively engage and disengage an output of the DCC in different operating modes;
- wherein the output in the DCC is coupled to a drive gear;
- wherein the forward strut and the reverse strut are hingingly coupled to an input of the DCC;
- wherein, during engagement of the forward strut, torque transfer from an input of the DCC to an output of the DCC occurs in a first rotational direction and is prevented in a second rotational direction;
- and
- wherein, during engagement of the reverse strut, torque transfer from the input of the DCC to the output of the DCC occurs in the second rotational direction and is prevented in first rotational direction.
15 more elements
Dependencies are inferred from the claim text.