Abstract
Shift shock may occur due to engine speed change during shift operation of automatic transmission. In this study, a simulation model of up-shift operation was built, and the model was used as a controlled object. In the shift operation, output torque and shift time are important controlled variables. Engine torque and clutch pressure are control inputs. The relation between the input variables and the controlled variables are interfered with each other, or coupled. By applying decoupling control theory to the shift operation, the relation becomes decoupled. Combining the internal model control as a feedback controller, a decoupling control system of output shaft torque and slip velocity was designed. As a result of simulation study, the output shaft torque and the slip velocity were controlled precisely, and the interference between the input and the output variables was reduced by the proposed controller.
