Control device of hybrid vehicle

A control device of a hybrid vehicle,

• the hybrid vehicle including:
• an electric motor and an engine as traveling driving sources;
• a transmission shaft that transmits driving power of the electric motor to a driving wheel;
• and
• a clutch that switches whether to transmit driving power of the engine to the transmission shaft,
• the control device comprising processing circuitry, wherein:
• when a first traveling mode in which the driving wheel is driven by the power generated by the electric motor is changed to a second traveling mode in which the driving wheel is driven by at least the power generated by the engine, the processing circuitry executes rotational frequency synchronization control of controlling the engine such that a rotational frequency of the transmission shaft which corresponds to rotation of the engine synchronizes with a rotational frequency of the transmission shaft which corresponds to rotation of the electric motor;
• during execution of the rotational frequency synchronization control, the processing circuitry controls the clutch such that a degree of engagement of the clutch which is a degree of power transmission between the engine and the transmission shaft increases with time;
• and
• based on a traveling state or a driving operation state, the processing circuitry changes a time required to change the clutch from a disengaged state to an engaged state or changes an initial target value of an output of the engine in the rotation synchronization control.