CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

摘要

PROBLEM TO BE SOLVED: To precisely detect starting time of an inertia phase without using a detection value of a sensor to detect input shaft rotation speed of an automatic transmission. SOLUTION: In a step 2, a high pass filter process to output shaft rotation speed No is executed to obtain rotation speed Nofil after the high pass filter process. A cut-off frequency of a high pass filter is set to restrict fluctuation components by acceleration/deceleration of a vehicle among fluctuation components of the output shaft rotation speed No. In a step 3, it is determined if the rotation speed Nofil after the high pass filter process is a negative threshold or under or not. In a case where result of above determination is YES, the time when the rotation speed Nofil becomes the negative threshold value or under is taken as the starting time of the inertia phase. COPYRIGHT: (C)2005,JPO&NCIPI