Engine system

An engine system comprising:

• an engine comprising a piston, a cylinder, an intake valve, and an exhaust valve;
• an intake manifold configured to introduce intake air into the engine;
• an intake pressure sensor configured to detect intake pressure inside the intake manifold;
• and
• a control device configured to control the engine, wherein
• the control device comprises:
• one or more processors;
• and
• one or more memories coupled to the one or more processors,
• a first threshold, determined by the intake pressure at a first timing during rapid warm-up of the engine in an initial state, is prepared in advance,
• the first timing is included in a period within one cycle of the engine, the period being after an intake valve opening timing that represents a timing at which the intake valve changes from a closed state to an open state, and before the piston reaches a bottom dead center, and
• the one or more processors execute a process comprising:
• obtaining, by the intake pressure sensor, the intake pressure at the first timing during the rapid warm-up of the engine in a current state;
• determining whether the intake pressure obtained by the intake pressure sensor is less than the first threshold;
• and
• when the intake pressure obtained by the intake pressure sensor is determined to be less than the first threshold, executing a timing advance process to relatively advance a fuel injection timing in the engine according to a pressure difference between the first threshold and the intake pressure obtained by the intake pressure sensor.