Method and apparatus for generating a cornering-corrected eLSD control signal
AssigneeGM Global Technology Operations LLC
InventorsMatthew G. Villella, Edmund F. Gaffney
Life of this patent
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Abstract
Methods and apparatus are provided for generating a slip control for an active driveline device (such as an electronic limited slip differential (eLSD)) that corrects for longitudinal tire slip in the turning wheels of a vehicle. Indicia of a yaw rate of the vehicle are obtained by the eLSD, which then determining a target velocity difference for the turning wheels based at least in upon the yaw rate, along with other factors such as difference in wheel rotation speed or the wheel-road angle of the vehicle. Using these measured parameters, a slip control signal can be applied to the eLSD as a function of the determined target velocity difference.
Claims20
A method of generating a slip control for an electronically-controlled limited slip differential (eLSD) that provides torque distribution to the turning wheels of a vehicle, the method comprising the steps of:
- obtaining indicia of a yaw rate of the vehicle;
- determining a target velocity difference for the turning wheels at least in part as a function of the yaw rate;
- and
- applying the slip control signal to the eLSD as a function of the determined target velocity difference.
A system for generating a slip control for an electronically-controlled limited slip differential (eLSD) that provides torque distribution to the turning wheels of a vehicle, the system comprising:
- means for obtaining indicia of a yaw rate of the vehicle and a difference in rotation speed between the turning wheels and for determining a target velocity difference for the turning wheels at least in part as a function of the yaw rate and the difference in rotation speed;
- and
- means for applying the slip control signal to the eLSD as a function of the determined target velocity difference.
An electronically-controlled limited slip differential (eLSD) system for distributing torque between a first shaft and a second shaft, the system comprising:
- an electronically-controlled clutch coupling the first and second shaft and regulating the relative rotation thereof in response to a control signal;
- differential calculation logic configured to receive indicia of a vehicle yaw rate and a speed difference between the first and second shafts, to determine a target velocity difference for the first and second shafts at least in part as a function of the yaw rate and the speed difference, and to provide an indication of the target velocity difference to the control logic;
- and
- control logic coupled to the clutch and configured to provide the control signal thereto as a function of the target velocity difference.
Dependencies are inferred from the claim text.