F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
F16H 59/14 (2006.01) F16H 61/06 (2006.01) F16H 59/46 (2006.01) F16H 61/02 (2006.01)
Patent
CA 2083932
TRANSMISSION CONTROL SYSTEM WITH LOAD COMPENSATED SHIFT MODULATION Abstract of the Disclosure A vehicle has a powershift transmission driven by an engine via a torque converter. The transmission is shifted by pressure operated clutches which are controlled by electrohydraulic pressure control valves. A speed ratio value representing a ratio of the torque converter output shaft speed to the torque converter input shaft speed is determined. A minimum clutch pressure value and a slope value are determined as a function of the speed ratio value. During a shifting of the transmission, a pulse-width-modulated signal applied to the valve is controlled so that the pressure applied to the clutch will vary from the minimum clutch pressure to a maximum clutch pressure at a rate proportional to the slope value.
Borden Ladner Gervais Llp
Deere & Company
Testerman Michael D.
LandOfFree
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