Control system for vehicle

A control system for a vehicle, the vehicle including an internal combustion engine, a supercharger, a power transmission system, and a rotary Machine, the internal combustion engine being configured to perform homogeneous charge compression ignition operation, the supercharger being configured to supercharge intake air into the internal combustion engine, the power transmission system being configured to transmit a power of the internal combustion engine to a drive wheel of the vehicle, the rotary machine coupled to the drive wheel so as to transmit a power to the drive wheel, the control system comprising:

• an electronic control unit configured to
• i) calculate a target supercharging pressure of the intake air such that, when the internal combustion engine is operated through the homogeneous charge compression ignition, the internal combustion engine achieves a required output of the internal combustion engine while satisfying a predetermined requirement,
• ii) control an output of the internal combustion engine such that the output of the internal combustion engine approaches the required output in accordance with an actual supercharging pressure in process of changing the actual supercharging pressure to the target supercharging pressure that is achieved by the supercharger, and
• iii) control the rotary machine such that an output of the rotary machine compensates for part or all of a differential output between the required output and the output of the internal combustion engine in process of changing the actual supercharging pressure to the target supercharging pressure.