Calibration method for transmission control clutches

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

1993-10-18

1994-08-16

Lorence, Richard M.

192 clutches and power-stop control

Clutches

Operators

192 85CA, F16D 25061

Patent

active

053378717

ABSTRACT:
A vehicle powershift transmission has a lube oil passage which communicates lube oil to a clutch pack. Communication of lube oil is controlled as a function of the engagement state of the clutch pack. The hydraulic control pressure required to initially engage the clutch pack is determined or calibrated by a method wherein the lube oil pressure is monitored while the clutch control pressure is gradually increased. When the lube oil pressure reaches a certain level corresponding to clutch pack engagement, the current value of the control pressure is saved as the calibration pressure.

REFERENCES:
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U.S. patent application Ser. No. 07/521,504 (Bulgrien et al.).
SAE Technical Paper Ser. 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 1-7, co-pending with App. Ser. No. 07/521,808 filed May 10, 1990.

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