Transmission control system

Details Transmission control system Transmission control system

1978-11-20

1981-11-24

Husar, C. J.

Machine element or mechanism

Gearing

Interchangeably locked

74866, 74732, 192 8719, F16H 542, F16D 1900

Patent

active

043016898

ABSTRACT:
In a transmission control system for a multiple speed ratio powershift transmission having a speed control valve and a plurality of fluid pressure operated clutches adapted to establish torque ratio changes, an electronic speed sensing system and downshift valve means for automatically shifting the transmission one step from a higher speed ratio to a lower speed ratio at a first predetermined vehicle ground speed by diverting the fluid for pressurizing a higher speed ratio clutch to a lower speed ratio clutch and then automatically shifting the transmission from the lower speed ratio back to the higher speed ratio at a second higher predetermined vehicle ground speed by ceasing the diverting of the pressurized fluid, with the fluid diverting being possible only when the speed control valve setting corresponds with the higher speed ratio.

REFERENCES:
patent: 3334703 (1967-08-01), Zeller
patent: 3439564 (1969-04-01), Scholl et al.
patent: 4049101 (1977-09-01), Hattori et al.
patent: 4164876 (1979-08-01), Peppel

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