ENGINE CONTROL APPARATUS

Engine-control-apparatus includes: engine including injector injecting fuel into combustion-chamber and ignition-plug igniting air-fuel-mixture in combustion-chamber; and controller controlling injector/ignition-plug to switch combustion-mode based on required-torque of engine. Combustion-mode includes: SI-combustion of gasoline-fuel with ignition; first-HCCI-combustion of reformed-fuel without ignition, reformed-fuel being obtained by reforming portion of gasoline-fuel into peroxide; second-HCCI-combustion of reformed-fuel with ignition; and diffusion-combustion of reformed-fuel without ignition. Controller controls injector/ignition-plug to switch combustion-mode: to second-HCCI-combustion when required-torque is less than first-predetermined-value; to first-HCCI-combustion when required-torque is first-predetermined-value or more and less than second-predetermined-value larger than first-predetermined-value; to SI-combustion when required-torque is second-predetermined-value or more and less than third-predetermined-value larger than second-predetermined-value; and to diffusion-combustion when required-torque is third-predetermined-value or more.