Drive system

A driving system comprising:

• an engine;
• a motor generator;
• a gear mechanism that couples the engine and the motor generator to each other;
• and
• a controller,
• the gear mechanism including a first gear and a second gear, the first gear being configured to be supplied with first driving torque from the engine, the second gear being configured to be supplied with second driving torque from the motor generator and meshing with the first gear,
• the controller being configured to perform torque control of the engine to make a rate of variation in the first driving torque at the first gear at a time when the following conditional expression (1) is satisfied smaller than a rate of variation in the first driving torque at the first gear at a time when the following conditional expression (1) is not satisfied,
• |T2−T1|<Th1 (1)
• where T1 is the first driving torque, T2 is the second driving torque, and Th1 is a first threshold.