Control circuit for motor vehicle automatic transmission, has computers to determine clutch force and transmission input force and control ratio changes

摘要

The control circuit for a motor vehicle automatic transmission operates the clutch (C1,2) to change gear and during changing of the speed ratio, controls the clutch torque in response to a preset control value. A computer determines the clutch force for release and has a model of the automatic transmission using a further computer (34) to determine transmission (32) input force.