Interrelated power delivery controls – including engine control – Transmission control – Engine controlled by transmission
Reexamination Certificate
2006-01-31
2006-01-31
Ho, Ha (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
Engine controlled by transmission
C477S111000, C477S162000
Reexamination Certificate
active
06991584
ABSTRACT:
An automatic transmission ratio shift and shift feel control system and method for a powertrain having an engine, multiple-ratio gearing controlled by friction elements actuated by hydraulic pressure, an output shaft torque sensor producing a signal representing the magnitude of current output torque, an electronic controller for controlling the target output torque based on the current output torque, increasing the torque capacity of the oncoming friction element and decreasing the torque capacity of the offgoing friction element after a gear ratio change is initiated. During the inertia phase of the ratio change, the controller controls the engine speed to follow a predetermined rate of change of input speed. The strategy employs an electronic throttle and closed loop engine torque control and closed loop engine speed control at various phases of the gear shift, to improve shift feel. Various engine parameters, including throttle position, ignition timing, engine air-fuel ratio, and engine airflow, control engine torque and speed, are used to control input torque or input speed, depending upon the shift phase.
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Ford Global Technologies LLC
Ho Ha
Kelley David B.
MacMillan Sobanski & Todd
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