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AssigneeGM Global Technology Operations LLC
InventorsRobert L. Morris, R. Anthony Hansen, Michael D. Haggerty
Estimating the term…
An improved method and apparatus for estimating driveline lash in a vehicle powertrain is provided herein. The method includes: determining if the powertrain is transitioning through driveline lash, e.g., driver commanded torque value changes sign, and then stays between a minimum and maximum commanded torque threshold for a calibrated time; if the powertrain is transitioning through driveline lash, determining when the driveline lash is taken up, e.g., when the transmission output acceleration exceeds a threshold minimum output acceleration, and thereafter changes sign; determining when the estimated lash state changes from neutral to a positive or negative state, which may be inferred from the axle torque estimate behavior; determining the time difference between when the driveline lash is taken up and when the estimated lash state changes from neutral to a positive or negative state; and updating the adaptive lash estimate if the aforementioned time difference is not equal to zero.
A method for determining driveline lash in a vehicle powertrain having a transmission, the method comprising:
A method for estimating driveline lash in a hybrid vehicle powertrain having at least one torque generative device in operative communication with a power transmission, the method comprising:
A control apparatus for estimating driveline lash in a vehicle powertrain having at least one torque generative device in driving communication with a power transmission, the control apparatus comprising:
Dependencies are inferred from the claim text.