System and method for shifting in a dual motor transmission
AssigneeDana Italia S.R.L.
InventorsPier Paolo Rinaldi, Giacomo Faggiani, Mark Slater
Life of this patent
Estimating the term…
Abstract
Methods and systems for a transmission. In one example, the transmission system includes a first electric motor that is rotationally coupled to a first shaft with a first gear idly mounted thereto and a second electric motor that is rotationally coupled to a second shaft with a second gear idly mounted thereto. The transmission system further includes an intermediate shaft with a third gear fixedly coupled thereto, a first clutch configured to selectively rotationally couple the first gear and the first shaft, and a second clutch configured to selectively rotationally couple the second gear and the second shaft.
Claims17
A transmission system comprising:
- a first electric motor rotationally coupled to a first shaft with a first gear idly mounted thereto;
- a second electric motor rotationally coupled to a second shaft with a second gear idly mounted thereto;
- an intermediate shaft with a third gear fixedly coupled thereto;
- a first clutch configured to selectively rotationally couple the first gear and the first shaft;
- and
- a second clutch configured to selectively rotationally couple the second gear and the second shaft;
- and
- a controller including instructions that when executed, during a shifting transient when the first clutch is in a neutral configuration, cause the controller to:
- adjust a speed of the first electric motor based on a speed of the first gear;
- and
- when a speed difference between the first shaft and the first gear is below a threshold value, operate the first clutch to rotationally couple the first gear and the first shaft;
- wherein the third gear meshes with the first gear and a fourth gear that meshes with the second gear;
- and
- wherein the first gear and the second gear are equally sized.
A method for operation of a transmission system comprising:
- operating a first electric motor and a second electric motor in opposing rotational directions while a first clutch and a second clutch engage a first gear and a second gear;
- when the first clutch is in a neutral configuration, adjusting a speed of the first motor based on a speed of the first gear;
- and
- when a speed difference between the first shaft and the first gear is below a threshold value, operating the first clutch to rotationally couple the first gear and the first shaft;
- wherein the transmission system includes:
- the first electric motor rotationally coupled to a first shaft with the first gear idly mounted thereto;
- the second electric motor rotationally coupled to a second shaft with the second gear idly mounted thereto;
- an intermediate shaft with a third gear fixedly coupled thereto;
- and
- the first clutch configured to selectively rotationally couple the first gear and the first shaft;
- and
- the second clutch configured to selectively rotationally couple the second gear and the second shaft;
- wherein the third gear meshes with the first gear and a fourth gear that meshes with the second gear;
- and
- wherein the first gear and the second gear are equally sized.
An electric transmission system, comprising:
- a first electric motor driving a first shaft with a first gear idly mounted thereto;
- a second electric motor driving a second shaft with a second gear idly mounted thereto;
- an intermediate shaft with a third gear fixedly coupled thereto;
- a fifth gear idly mounted to the first shaft;
- a sixth gear idly mounted to the second shaft;
- a seventh gear fixedly coupled to the intermediate shaft and meshing with the fifth gear and the sixth gear;
- a first dog clutch configured to selectively rotationally couple the first gear and the first shaft and the fifth gear and the first shaft in different configurations;
- and
- a second dog clutch configured to selectively rotationally couple the second gear and the second shaft and the sixth gear to the second shaft in different configurations;
- a controller including instructions that when executed, during a shifting transient, cause the controller to:
- speed match the first shaft and the first gear or the fifth gear when the first dog clutch is in a neutral configuration;
- wherein the third gear meshes with the first gear and the second gear.
Dependencies are inferred from the claim text.