| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power transmission device which improves the driving efficiency of a hybrid vehicle. <P>SOLUTION: According to the results of determinations whether a clutch C, which connects a second motor Mb with a differential D to which an internal-combustion engine E and a first motor Ma are connected, is in an "ON" state or "OFF" state, whether a vehicle is in a cruise traveling state and whether a gear-change ratio (for example, not only a gear-change ratio value itself but also the result of determination whether a gear-change ratio is relatively such a small one as the fourth shift position, fifth shift position and sixth shift position), the operation ("ON" or "OFF" operation) of the clutch C is retrieved by map retrieval. When the operation is in the "OFF" state, the clutch C is changed from the "ON" state to the "OFF" state independently of the determination of the operation of the clutch C based on the state quantity of the first motor, for example, such as a field-weakening current. <P>COPYRIGHT: (C)2007,JPO&INPIT |
