192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1992-07-09
1993-07-06
Braun, Leslie A.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 0033, 192109F, 3644241, F16D 2104, F16H 546
Patent
active
052245772
ABSTRACT:
The hydraulically operated brake and clutch elements (controlled by proportional control valves) of a vehicle powershift transmission have fill pressures which are calibrated by a method wherein the output shaft of the transmission is disconnected from the vehicle drive shaft so that the transmission output shaft is free to rotate and certain ones of the plurality of the control elements other than the control element being calibrated are fully pressurized in order to prevent rotation of a part of the control element being calibrated. The engine is run at a predetermined speed and the pressure applied to the control element being calibrated is gradually increased while engine speed is monitored. When the monitored engine speed changes by predetermined amount, a value is saved corresponding to the calibration pressure. The transmission is automatically shifted to neutral if vehicle motion is sensed. The volume of hydraulic fluid required to initially engage the control element may be calibrated in a similar manner.
REFERENCES:
patent: 4741364 (1988-05-01), Stoss et al.
patent: 4855913 (1989-08-01), Brekkestran et al.
patent: 4899858 (1990-02-01), Cote et al.
patent: 4967385 (1990-10-01), Brekkestran et al.
patent: 4989471 (1991-02-01), Bulgrien
patent: 5011465 (1991-04-01), Jeffries et al.
patent: 5082097 (1992-01-01), Goeckner et al.
patent: 5138906 (1992-08-01), Iwatsuki et al.
U.S. patent application Ser. No. 07/521,504 (Bulgrien et al.), filed 10 May 1990.
Ford New Holland, "Part 5-Transmission Systems (Post Mar. 1990)", published 1990, pp. 1-7, co-pending with application Ser. No. 07/521,808 filed 10 May 1990.
Goodbar, J. E. and Testerman, M. D., "The Design and Development of a Four Speed Powershift Transmission with Electronic Clutch Pressure Modulation", SAE Technical Paper Series, No. 861212, Sep. 1986.
Brandon David E.
Falck Peter L.
Jeffries Dennis L.
Braun Leslie A.
Deere & Company
Pitts Andrea
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