Electric power shift transmission and power shift method
AssigneeDana Belgium N.V.
InventorsPauwel Coenen, Joachim Van Dingenen, Christophe De Buyser, Kurt Cattoor, Bert Hannon
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Abstract
Systems and methods for an electric powertrain. The method, in one example, includes responsive to receiving a shift command, engaging a second friction clutch while disengaging a first friction clutch to transition from a first operating gear ratio to a second operating gear ratio. The method, further includes during the gear ratio transition, operating a traction motor under a peak condition, the peak condition denotes a condition where the motor speed is greater than a maximum continuous torque curve of the motor.
Claims20
A method, comprising:
- receiving a first shift command to initiate a first shift event in a transmission;
- in response to receiving the first shift command, engaging a second friction clutch while disengaging a first friction clutch to transition from a first operating gear ratio to a second operating gear ratio;
- and
- during the gear ratio transition, operating a traction motor under a peak condition;
- wherein the peak condition includes a condition where a torque of the traction motor exceeds a maximum continuous torque threshold.
An electric powertrain system, comprising:
- a first friction clutch configured to selectively engage a first operating gear ratio in a transmission;
- a second friction clutch configured to selectively engage a second operating gear ratio;
- and
- a controller including instructions that when executed, in response to receiving a shift command, cause the controller to:
- engage the second friction clutch and disengage the first friction clutch at an overlapping interval to implement a first power shift event;
- and
- during the overlapping interval, operate a traction motor under a peak condition;
- wherein the peak condition includes a condition where a torque of the traction motor exceeds a maximum continuous torque threshold;
- and
- wherein the second operating gear ratio is greater than the first operating gear ratio.
A method for operation of an electric powertrain system, comprising:
- operating a traction motor above a maximum continuous torque threshold, during a torque hand-off between a second wet friction clutch and a first wet friction clutch in a power shift event;
- and
- operating the traction motor at or below the maximum continuous torque threshold prior and subsequent to the power shift event.
Dependencies are inferred from the claim text.