Control Valve Hydraulic Pressure Correction Control And Learning Control

During this control, the TCM acquires the hydraulic pressure correction data stored for each control valve in the memory box installed on the control valves, and then correctively controls the instruction current to each solenoid based on the data. This ensures stable shifting quality irrespective of variance between units.

To constantly ensure excellent shift quality regardless of the variance between friction material and aging, learning control of shifting hydraulic pressures is used.

Learning takes place for every normal shifting under certain conditions, and the learned values are saved in the flash ROM of the TCM. The values are not cleared even when the power is turned OFF (or the battery's negative terminal disconnected).