192 clutches and power-stop control – Clutches – Operators
Patent
1994-06-07
1995-11-21
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
475128, 477154, 477155, F16D 2510, F16D 4806
Patent
active
054678544
ABSTRACT:
In one aspect of the present invention, an electronic shift control for a powershift transmission is disclosed. The transmission includes a plurality of speed and direction changing clutches. A plurality of pressure control valves are individually connected to the clutches. A hydraulic pump delivers pressurized hydraulic oil to predetermined pressure control valves to meter hydraulic fluid in response to receiving a clutch command signal. The method produces a shift from a first transmission ratio to a second transmission ratio through disengagement of an off-going clutch associated with the first transmission ratio and engagement of an on-coming clutch associated the second transmission ratio. The method includes filing an on-coming speed clutch, releasing an off-going direction clutch in response to the on-coming speed clutch being filled, and thereafter, gradually increasing the on-coming speed clutch pressure to engage the speed clutch. Finally, the on-coming direction clutch pressure is gradually increased to engage the direction clutch in response to the on-coming speed clutch being engaged.
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Creger Todd D.
Mitchell Randall M.
Stahl Alan L.
Talbott James R.
Bonck Rodney H.
Caterpillar Inc.
Masterson David M.
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