Clunk and shuffle management in multi-motor, multi-axle electrified drivetrains
AssigneeFord Global Technologies, LLC
InventorsMaruthi Ravichandran, Bhavesh Paradkar, Rajit Johri, Naginder Gogna, Mary Catherine Farmer, Shunsuke Okubo
Life of this patent
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Abstract
Methods and systems are provided for a drivetrain system comprising: a first prime mover for supplying a torque to a front axle; a second prime mover for supplying a torque to a rear axle; and a controller configured to, in response to a torque reversal, command the front axle and the rear axle to cross lash zones sequentially.
Claims20
A drivetrain system, comprising:
- a first electric motor for supplying a torque to a front axle;
- a second electric motor for supplying a torque to a rear axle;
- and
- a controller configured to, in response to a torque reversal, command the front axle and the rear axle to cross lash zones sequentially,
- wherein the front axle and the rear axle are independent of one another, and the first electric motor is drivingly coupled only to the front axle and the second electric motor is drivingly coupled only to the rear axle.
A method for a drivetrain system having a first electric motor for supplying a torque to a front axle and a second electric motor for supplying a torque to a rear axle, comprising:
- during a first driving mode and a tip-out condition,
- controlling the first electric motor to provide positive torque and the second electric motor to provide negative torque, the sum of the negative torque and the positive torque electronically controlled to be equal to a total driver demand torque, wherein the front axle and the rear axle are independent of one another.
A method for a drivetrain system having a first electric motor for supplying a torque to a front axle and a second electric motor for supplying a torque to a rear axle, comprising:
- during a first driving mode and a tip-out condition,
- electronically controlling the first electric motor to provide negative torque and the second electric motor to provide positive torque, the sum of the negative torque and the positive torque equal to a total driver demand torque;
- and
- during a second driving mode and the tip-out condition,
- controlling the first electric motor to provide a first negative torque and the second electric motor to provide a second negative torque, the sum of the first negative torque and the second negative torque equal to the total driver demand torque;
- and
- selecting one of the front axle or the rear axle to transition a lash first based on a torque capacity of the first electric motor, the torque capacity of the second electric motor, and a driver tip-in magnitude.
Dependencies are inferred from the claim text.