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US 6,299,565 B1Granted
Control strategy for an automatic transmission
AssigneeFord Global Technologies, LLC
InventorsPramod Kumar Jain, Balaram G. Sankpal, Hong Jiang
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AssigneeFord Global Technologies, LLC
InventorsPramod Kumar Jain, Balaram G. Sankpal, Hong Jiang
Estimating the term…
An automatic control strategy for use with a multiple-ratio transmission in an automotive vehicle driveline in which the crankshaft of an internal combustion engine is connected directly to torque input elements of multiple-ratio gearing without an intervening hydrokinetic torque converter. The strategy is adapted especially for use with a wet auto clutch to provide forward or reverse drive engagement during vehicle launch and during transient damping of driveline disturbances. The strategy makes it possible to control the clutches to achieve maximum vehicle acceleration by controlling the engine speed so that it operates at maximum torque throughout the useful engine speed range for any given engine throttle position. The entry and exit conditions for each drive mode are determined by the strategy so that optimum drive-away performance and optimum shift control, as well as soft clutch engagement and full clutch engagement, can be achieved.
A method and control strategy for controlling engagement of a friction cluctch in an automotive vehicle driveline having a throttle-controlled internal combustion engine and a geared transmission defining torque flow paths between the engine and a driven shaft, a driver-controlled ratio range selector for selecting forward ratio range, reverse and neutral, the clutch being disposed between the engine and torque input elements of the gearing, the transmission including an electronic controller for varying the torque-transmitting capacity of the clutch in response to changes in driveline variables;
A method and control strategy for controlling engagement of a friction clutch in an automotive vehicle driveline having throttle-controlled internal combustion engines and general torque flow paths between the engine and a driven shaft, the clutch being disposed between the engine and torque input elements of the gearing, the transmission including an electronic controller and a solenoid-operated clutch pressure control valve for varying the torque-transmitting capacity of the clutch in response to changes in driveline variables;
Dependencies are inferred from the claim text.