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US 12,741,549 B2Granted
Transmission shifting system and method
AssigneeDana Heavy Vehicle Systems Group, LLC
InventorsRohit Koli, Nathan Smith, Mohammed Yasin
Life of this patent
Estimating the term…
Abstract
Methods and systems for adjusting operation of a dog clutch actuator are shown. The systems and methods may base dog clutch actuator adjustment on a roll-off time that describes when reduction of propulsion source torque has produced a corresponding reduction in dog clutch torque that will allow the dog clutch to be disengaged with minimal effort.
Claims18
A method for operating a transmission, comprising:
- commanding a reduction in electric machine torque;
- and
- commanding a dog clutch actuator from a first position where a dog clutch is engaged via the dog clutch actuator to a second position where the dog clutch is disengaged via the dog clutch actuator responsive to a predetermined amount of time since commanding the reduction in electric machine torque, where the predetermined amount of time is based on a transfer function.
A propulsion system, comprising:
- a transmission including a dog clutch;
- a propulsion source coupled to the transmission;
- a controller including executable instructions stored in non-transitory memory that cause the controller to disengage the dog clutch from a gear in response to an amount of time since a reduction in torque of the propulsion source, the reduction in torque of the propulsion source based on a gear shift request, where the amount of time is based on an estimated transfer function.
A method for operating a transmission, comprising:
- commanding a dog clutch actuator from a first position where a dog clutch is engaged to a second position where the dog clutch is disengaged a predetermined amount of time since commanding a reduction in an electric machine torque, where the predetermined amount of time is based on an estimated dog clutch torque being within a threshold torque of a dog clutch neutral torque, where the dog clutch neutral torque is a motor torque at which there is less than a predetermined amount of torque that is transferred through the dog clutch.
Dependencies are inferred from the claim text.