클러치의 독립구동에 의한 자동변속기의 변속제어

A study to reduce the transient torque in shifting in automatic transmission has been very important issue. Recently, it is really dominant to decrease the torque by using independent-acting hydraulic circuit because we can control the clutch pressure actively and elaborately. So, we design the new hydraulic circuit to control the clutches in automatic transmission and make the module library of computer simulations. We apply the result to GM model automatic transmission and carry out 1→4 shifting simulations. By this work, we recognize the capability of active and elaborate clutch pressure control using new hydraulic circuit. In addition, We develop the tool to simulate the powertrain system. It is easier to update and exchange the subsystem model or parameters than conventional simulation tools.