GEAR CHANGE CONTROL DEVICE FOR VEHICULAR AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To quickly provide desired drive force after completion of down shift by quickly changing input shaft rotation speed to synchronizing rotation speed with preventing racing of a power source in a gear shift control device performing torque down control when down shift determination is done during up shift operation and down shift is performed. SOLUTION: When 3→2 down shift determination is done during 1→3 up shift operation, this gear change control device determines whether change of turbine rotation speed NT during down shift is in a decent trend or an accent trend based on whether turbine rotation speed NT is control change over rotation speed (ntdoki+n1) defined according to synchronizing rotation speed ntdoki after down shift of more, and immediately performs torque down control when change of turbine rotation speed NT is in the decent trend (NO in determination of S2) and stars torque down control after turbine rotation speed NT becomes control start rotation speed (ntdoki-n2) or more when change of turbine rotation speed NT is in the accent trend (YES in determination of S2). COPYRIGHT: (C)2007,JPO&INPIT