Calibration method for transmission control clutches

Details Calibration method for transmission control clutches Calibration method for transmission control clutches

1998-01-15

2000-09-12

Hoff, Marc S.

Data processing: measuring, calibrating, or testing

Calibration or correction system

477 78, F16D 2104

Patent

active

061190721

ABSTRACT:
The hydraulically operated clutch elements of a powershift transmission have hold pressures which are calibrated by determining a parasitic drag time value represent a speed change of a clutch component due to a friction characteristic of the transmission, by calculating a target speed change value from the parasitic drag time valueas, and by deriving the clutch calibration values from the target speed change value.

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SAE Technical Paper Series No. 861212, Sep. 1986, Goodbar, J.E. and Testerman, M.D., entitled "The Design And Development of a Four Speed Powershift Transmission with Electronic Clutch Pressure Modulation".
Ford New Holland, "Part 5--Transmission Systems (Post Mar. 1990)" published 1990, pp. 1-7.
Copy of U.S. Patent Application 07/521,504 (Bulgrien et al.) filed May 10, 1990, now abn.

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