Apparatus and method for determining driveline lash estimate

Details Apparatus and method for determining driveline lash estimate Apparatus and method for determining driveline lash estimate

2008-11-04

2011-10-25

Camby, Richard M. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S031000

Reexamination Certificate

active

08046142

ABSTRACT:
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.

REFERENCES:
patent: 6574535 (2003-06-01), Morris
patent: 6953409 (2005-10-01), Schmidt et al.
patent: 7315774 (2008-01-01), Morris
patent: 7823471 (2010-11-01), Tamai et al.
patent: 7971667 (2011-07-01), Yamazaki
patent: 2007/0225886 (2007-09-01), Morris
patent: 2007/0225887 (2007-09-01), Morris
patent: 2007/0225888 (2007-09-01), Morris

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