Slip detection and mitigation for an electric drive powertrain having a high ratio traction drive transmission
AssigneeDana Automotive Systems Group, LLC
InventorsJeffrey M. David, Travis J. Miller
Life of this patent
Estimating the term…
Abstract
A method of controlling a continuously variable electric drivetrain (CVED) including a high ratio traction drive transmission and at least one of a first motor-generator and a second motor-generator is disclosed. The method includes the steps of receiving an output speed, determining a kinematic output speed, and determining a slip state of the high ratio traction drive transmission based on a comparison of the output speed to the kinematic output speed.
Claims19
A continuously variable electric drivetrain, comprising:
- a traction drive transmission;
- a first motor-generator and a second motor-generator coupled to the traction drive transmission;
- and
- an electronic controller configured to:
- receive a measured speed of a first rotating member of the continuously variable electric drivetrain;
- determine a calculated speed of the first rotating member or one of the motor-generators;
- determine a slip state of the traction drive transmission based on a comparison of the calculated speed and the measured speed;
- and
- if the traction drive transmission is determined to be in a state of slip, then mitigate the state of slip by adjusting a power ratio between the first motor-generator and the second motor-generator by switching the first motor-generator from a torque-control mode to a speed-control mode.
A method of controlling a drivetrain, comprising:
- receiving a measured speed of a first rotating member of a continuously variable electric drivetrain;
- determining a calculated speed of the first rotating member or a motor;
- determining a slip state of a traction drive transmission based on a comparison of the calculated speed and the measured speed;
- determining a type of the slip state based on:
- a second comparison of a measured speed of a second rotating member to a second measured speed, and
- a third comparison of a measured speed of a third rotating member to a third measured speed;
- and
- if the traction drive transmission is determined to be in a state of slip, then mitigating the state of slip based on a speed of the motor connected to the traction drive transmission by switching the motor from a torque-control mode to a speed-control mode.
A method of controlling a continuously variable electric drivetrain, comprising:
- measuring an output speed of the continuously variable electric drivetrain;
- determining a second output speed of the continuously variable electric drivetrain;
- determining a slip state of a traction drive transmission based on an output comparison of the output speed to the second output speed;
- and
- in response to determining a positive slip state:
- performing a first comparison of a speed of a ring member of the traction drive transmission and a first motor speed;
- performing a second comparison of a speed of a sun member of the traction drive transmission and a second motor speed;
- and
- determining a fault based on the first comparison and the second comparison.
Dependencies are inferred from the claim text.