Patent ID: 8032287

Claim:
A driving system for a vehicle, comprising: a driving source; a step automatic transmission arranged to attain a predetermined shift state by selecting an engagement state of a frictional engagement element and to transmit a driving force of the driving source to driving wheels; a vehicle running state sensing device configured to sense a running state of the vehicle; and a control device configured to output a respective control command value to the driving source and the step automatic transmission in accordance with the running state, the control device including: a rotational speed control section configured to control a rotational speed of the driving source so that an input rotational speed of the step automatic transmission follows a target input rotational speed during an inertia phase during which the input rotational speed of the step automatic transmission varies in accordance with a shift; a frictional engagement force control section configured to control an engagement force of the frictional engagement element during the inertia phase; a driving force control section configured to control a driving force input to the step automatic transmission after the inertia phase in accordance with the running state; a driving force difference judgment section configured to judge whether or not a driving force difference input to the step automatic transmission that is equal to or greater than a predetermined value is generated before or after completion of the inertia phase; and a frictional engagement force correction section configured to selectively correct the engagement force so as to decrease the driving force difference when the driving force difference that is equal to or greater than the predetermined value is generated.