DUAL CLUTCH TYPE AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To provide a dual clutch type automatic transmission which controls the clutch torque to obtain a target engine speed changing speed at which the driving force during the racing of engine speed does not become lower than the driving force at the time of a shift start.

SOLUTION: A shift control device that controls the engagement of a clutch includes: a shift-start-time torque operation unit which computes the output torque of an engine at the start time of a power-on downshift as shift-start-time torque; a target speed acceleration operation unit which computes the target speed acceleration of the engine by dividing the difference obtained by subtracting the shift-start-time torque from the current output torque of the engine by the inertia torque of the engine; and a power-on downshift controller which controls the transmission torque of a high-speed stage side clutch so that the speed acceleration of the engine becomes equal to or less than the target speed acceleration during a period until the revolutions of the engine are synchronized with the revolution of a low-speed stage side input shaft and which engages a low-speed stage side clutch corresponding to the low-speed stage side input shaft when the revolution of the engine is synchronized with that of the low-speed stage side input shaft.

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