G - Physics – 05 – D
Patent
G - Physics
05
D
341/68
G05D 11/00 (2006.01) F16H 47/04 (2006.01) F16H 61/46 (2006.01)
Patent
CA 1037589
HYDROSTATIC TRANSMISSION CONTROL Abstract of the Disclosure An electronic control for a hydrostatic or hydromechanical transmission governs the transmission ratio as a primary function of a manual ratio request and as a secondary function of throttle setting, engine speed, pressure in the hydrostatic transmission and manual range selection. A ratio control signal is developed by comparing ratio request with the existing ratio control signal and integrating the difference to provide a smoothly changing ratio, and the rate of change is limited to a maximum value. Ratio change of the hydrostatic unit is carried out by varying the displacements of the hydrostatic pump and motor. The displacements are changed by servo motors electrically controlled by the electrical ratio signal. Synchronous range shifting in a gear set is accomplished by applying one torque transmitting device (e.g. brake or clutch) and releasing another torque transmitting device, each of which is fluid pressure operated. Pressure switches associated with each device determine whether it is applied or released. During range shifting, the hydrostatic unit is prevented from changing ratio until the shift is effected as indicated by the condition of the pressure switches. Engine speed is maintained within programmed limits by varying the ratio to prevent overspeed or underspeed. Shift logic and inhibit circuits responsive to manual range selection, transmission output speed, and the ratio control signal initiate range shifting only under desirable conditions.
235407
Dornfeld Kenneth A.
Marlow Jerry R.
Sanders Robert K.
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