Engine control device and engine control method

A control device for an engine, the device comprising:

• a supercharger provided in an intake passage of the engine;
• a supercharger driver configured to drive the supercharger;
• an intercooler configured to cool intake air discharged from the supercharger;
• and
• an EGR gas introduction portion configured to recirculate a portion of exhaust gas from the engine, as an EGR gas, to the intake passage,
• the intake passage including a bypass passage, the bypass passage being configured to bypass the supercharger and connecting a portion of the intake passage upstream of the supercharger and a portion of the intake passage downstream of the supercharger together,
• the supercharger driver making the supercharger supercharge the engine while the engine operates in a predetermined supercharged mode,
• the bypass passage branching upward from the portion of the intake passage upstream of the supercharger, and extending above the supercharger,
• the EGR gas introduction portion being provided as a portion of the bypass passage branching upward from the portion and extending above the supercharger,
• the intercooler being located below the supercharger,
• the device further comprising:
• a determiner configured to determine whether or not a condition that an amount of condensed water remaining in the intake passage has exceeded a predetermined upper limit has been met, based on an input parameter associated with the amount;
• and
• a controller configured to, if, during an operation of the engine in an unsupercharged mode, the determiner determines that the condition has been met,
• make the supercharger driver perform a condensed water discharging operation to drive the supercharger, such that the condensed water remaining is discharged to a cylinder of the engine through operation of the supercharger.

An engine intake and exhaust system, comprising

• a supercharger provided in an intake passage of the engine;
• and
• a supercharger driver configured to drive the supercharger, the supercharger driver making the supercharger supercharge the engine while the engine operates in a predetermined supercharged mode, wherein
• if a condition that an amount of condensed water remaining in the intake passage has exceeded a predetermined upper limit has been met, based on an input parameter associated with the amount, the supercharger driver performs a condensed water discharging operation of the supercharger, such that the condensed water remaining is discharged to a cylinder of the engine through operation of the supercharger.