| 摘要 |
<p>PURPOSE:To enhance the shift feeling in power-on/shifting-down with an automatic transmission which uses a plurality of hydraulically operated friction engagement elements. CONSTITUTION:An automatic transmission concerned comprises a plurality of hydraulically operated friction engagement elements 11C for shift operation, etc., a shift control means 20 to perform shifting through controlling of the engagement with them, and an oil pressure control means 56 which controls the engaging oil pressure using an electric drive actuator. At the time of power-on/shifting-down, the engaging oil pressure of the friction engagement element for the shifting pre-stage is discharged from the time a shift command is given, and the supply oil pressure to the friction engagement element for the shifting rear stage is sunk by the actuator, and the correction value for the engaging oil pressure to be supplied to the friction engagement element for the shifting rear stage is determined which is necessary for turning the input/output revolving speed ratio into 1.0 approximately at the time the shifting-down is completed, along with determination of the drive current correction value for the actuator corresponding to this correction value obtained, and the drive control of the actuator is conducted on the basis of the corrected drive current when the shift-down is completed.</p> |
