Drive device for vehicle

A drive device for a vehicle, comprising:

• an internal combustion engine and an electric motor installed on a vehicle as motive power sources;
• a first input shaft that is connected to said engine and said electric motor such that motive powers from said engine and said electric motor are transmitted thereto;
• a first clutch that connects and disconnects between said engine and said first input shaft;
• an output shaft that is connected to driven parts of the vehicle such that the motive powers can be transmitted to the driven parts;
• a first transmission gear group that is provided between said first input shaft and said output shaft, and forms a plurality of first speed positions;
• a first synchronizer that sets and unsets each of the plurality of first speed positions, by connecting two synchronization objects forming each of the plurality of first speed positions while synchronizing said two synchronization objects with each other, and releasing the connection between said two synchronization objects;
• a second input shaft that is different from said first input shaft and is connected to said engine such that a motive power from the engine is input thereto;
• a second transmission gear group that is provided between said second input shaft and said output shaft, and forms a plurality of second speed positions;
• a second synchronizer that sets and unsets each of the plurality of second speed positions, by connecting two synchronization objects forming each of the plurality of second speed positions while synchronizing said two synchronization objects with each other, and releasing the connection between said two synchronization objects;
• a second clutch that connects and disconnects between said engine and said second input shaft;
• first rotational speed-detecting means for detecting a rotational speed of said first input shaft as a first rotational speed;
• output rotational speed-detecting means for detecting a value indicative of a rotational speed of said output shaft as an output rotational speed;
• transmission control means for controlling said first clutch, said first synchronizer, said second clutch, and said second synchronizer, and controlling said first synchronizer such that said two synchronization objects of one of the plurality of first speed positions are connected to each other when a predetermined transmission condition is satisfied which is a condition for transmitting the motive power of said engine to said driven parts via the one first speed position;
• and
• electric motor control means for controlling, in a case where the predetermined transmission condition is satisfied, if the detected output rotational speed is not within a predetermined very low speed range, a rotational speed of said electric motor based on the detected first rotational speed and the detected output rotational speed such that a rotational speed difference between said two synchronization objects synchronized by said first synchronizer is reduced, and controlling, in the case where the predetermined transmission condition is satisfied, if the detected output rotational speed is within the predetermined very low speed range, the rotational speed of said electric motor to a predetermined speed for suppressing the rotational speed difference between said two synchronization object.