Dual double synchronizer e-transmission for reducing torque interruption during gear shifts
AssigneeDana Belgium N.V.
InventorsFilip D. SCHACHT, Kurt CATTOOR
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for a dual motor electric transmission configured with two dual synchronizers to reduce torque interruption during gear shifting. In one example, a method may include dropping torque of a first electric motor, allowing a first synchronizer to shift from a first gear arrangement to a second gear arrangement, and compensating for dropped torque with a second electric motor. The method may be repeated to shift a second synchronizer from the first gear arrangement to the second gear arrangement, allowing uninterrupted torque supply during gear shifting.
Claims20
A transmission system comprising:
- a first electric motor input shaft having two gears configured to mesh with a first pair of gears of a first synchronizer on a lay shaft;
- a first electric motor coupled to the first electric motor input shaft;
- a second electric motor input shaft having at least one gear configured to mesh with one gear of a second pair of gears of a second synchronizer on the lay shaft;
- and
- a second electric motor coupled to the second electric motor input shaft;
- wherein, the first electric motor and the second electric motor are configured to operate synchronously to increase torque supply with each of the first synchronizer and the second synchronizer in a first gear arrangement, and independently to decrease torque supply to allow the respective first synchronizer or the second synchronizer to shift to a second gear arrangement.
A power transmission system for a vehicle, comprising:
- a first electric motor coupled to a first gear set via a first input shaft and a second electric motor coupled to a second gear set via a second input shaft;
- a common lay shaft arranged between and parallel with the first input shaft and the second input shaft, the common lay shaft including a first dual synchronizer and a second dual synchronizer arranged in series along a first portion of the common lay shaft and coupled to the first input shaft and the second input shaft, respectively;
- and
- an output gear set coupled to the common lay shaft at a second portion of the common lay shaft, the second portion adjacent to the first portion, the output gear set configured to receive a torque output from one or more of the first electric motor and the second electric motor through the common lay shaft, wherein the torque output is modified based on selective engagement of the first and the second dual synchronizer with the first electric motor and the second electric motor, respectively.
A method for a transmission system for an electric vehicle, comprising:
- responsive to a high torque demand during a vehicle launch operation;
- providing power from each of a first electric motor and a second electric motor, the first electric motor and the second electric motor each coupled to a common lay shaft through a first synchronizer and a second synchronizer, respectively;
- and
- responsive to a decrease in the torque demand after the vehicle launch operation;
- adjusting a torque output at an output gear set coupled to the common lay shaft by varying engagements of the first electric motor and the second electric motor with the common lay shaft.
Dependencies are inferred from the claim text.