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US 2021/0229653 A1Published application
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
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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 a 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.
Claims20
An electric drivetrain, comprising:
- a traction drive transmission including a ring member, a carrier having a plurality of traction members, and a sun member;
- a first motor-generator and a second motor generator operably coupled to the traction drive transmission;
- and
- an electronic controller configured to:
- determine a slip state of the traction drive transmission based on a comparison of a speed of at least one of the ring member, the carrier, the plurality of traction members, and the sun member to a kinematic speed of the at least one of the ring member, the carrier, the plurality of traction members, and the sun member;
- if the first motor-generator and the second motor-generator are each below a respective base speed, adjust a power ratio between the first motor-generator and the second motor-generator in order to mitigate the slip state;
- and
- if one or both of the first motor-generator and the second motor-generator are at or above the respective base speed, lower a power output of the electric drivetrain to mitigate the slip state.
5 more elements
A method of controlling a continuously variable electric drivetrain, comprising:
- providing a first motor-generator, a second motor-generator, and a high ratio traction drive transmission having a ring member, a carrier configured to support a plurality of traction members, and a sun member, wherein one of the ring member, the carrier, and the sun member is operably coupled to the first motor-generator, wherein one of the ring member, the carrier, and the sun member transmits a rotational power, and wherein one of the ring member, the carrier, and the sun member is operably coupled to the second motor-generator;
- measuring a speed of at least one of the carrier, the ring member, the sun member, the first motor-generator, and the second motor-generator;
- determining a kinematic speed of at least one of the carrier, the ring member, the sun member, the first motor-generator, and the second motor-generator based on the speed of at least one of the first motor-generator and the second motor-generator;
- and
- determining that the high ratio traction drive transmission is operating in a slip state based on a first comparison of the measured speed of at least one of the carrier, the ring member, the sun member, the first motor-generator, and the second motor-generator to the kinematic speed of at least one of the carrier, the ring member, the sun member, the first motor-generator, and the second motor-generator;
- determining a type of the slip state based on a second comparison of the measured speed of the ring member to the measured speed of the first motor-generator and a third comparison of the measured speed of the sun member to the measured speed of the second motor-generator;
- and
- taking an action based on the determined type of the slip state.
5 more elements
A continuously variable electric drivetrain, comprising:
- a motor-generator;
- a high ratio traction drive transmission including a sun member, a carrier configured to support a plurality of traction members, and a ring member in contact with the traction members, wherein at least one of the ring member, the carrier, and the sun member is operably coupled to the motor-generator, wherein at least one of the ring member, the carrier, and the sun member transmits a rotational power, and wherein at least one of the ring member, the carrier, and the sun member is caused to remain stationary;
- and
- an electronic controller configured to:
- measure an output speed of the continuously variable electric drivetrain;
- determine a kinematic output speed of the continuously variable electric drivetrain based on a ring-to-sun ratio of the high ratio traction drive transmission;
- and
- determine a slip state of the high ratio traction drive transmission based on a comparison of the output speed to the kinematic output speed.
5 more elements
Dependencies are inferred from the claim text.