CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE, METHOD OF CONTROLLING INTERNAL COMBUSTION ENGINE, AND COMPUTER-READABLE STORAGE MEDIUM

A control apparatus for an internal combustion engine includes a cylinder internal pressure sensor, a fuel injection parameter calculator, a driving device, and a sensor output signal processing device. The sensor output signal processing device is configured to set a noise reduction period in accordance with an opening time and an opening start time of a fuel injection valve and is configured to reduce, during the noise reduction period, noise that is included in a cylinder internal pressure sensor output signal and that is caused by opening of the fuel injection valve.