Condensed water treatment device for internal combustion engine

A condensed water treatment device for an internal combustion engine, the condensed water treatment device comprising:

• a condensed water tank which stores condensed water generated in an exhaust system of the internal combustion engine;
• a condensed water supply device including a condensed water passage which supplies the condensed water stored in the condensed water tank to the internal combustion engine or a related device relating to the internal combustion engine;
• a condensed-water generation quantity controlling device controlling a generation quantity of the condensed water generated in the exhaust system;
• and
• a computer, the computer by executing a computer program functioning as:
• a storage-water-quantity decrease controlling device which is configured to control at least one of the condensed water supply device and the condensed-water generation quantity controlling device so that when a storage water quantity of the condensed water tank is more than a predetermined value the storage water quantity decreases;
• and
• a storage-water-quantity increase controlling device which is configured to control at least one of the condensed water supply device and the condensed-water generation quantity controlling device so that when the storage water quantity is equal to or less than the predetermined value the storage water quantity increases,
• wherein:
• the internal combustion engine comprises:
• an engine main body;
• an EGR passage which leads exhaust gas flowing through the exhaust system to an intake system as EGR gas;
• an EGR cooler which cools the EGR gas;
• a radiator which cools refrigerant having passed through the engine main body;
• and
• a cooling system including a low temperature pathway for leading to the EGR cooler, the refrigerant having passed through the radiator after passing through the engine main body and a high temperature pathway for leading to the EGR cooler, the refrigerant having bypassed the radiator after passing through the engine main body,
• the condensed water tank stores condensed water generated in the EGR cooler as the condensed water generated in the exhaust system,
• the condensed-water generation quantity controlling device includes a pathway switching valve included in the cooling system, the pathway switching valve switching between the low temperature pathway and the high temperature pathway, and a cooling pathway for leading the refrigerant to the EGR cooler,
• the storage-water-quantity decrease controlling device, which the computer functions as, is configured to control the pathway switching valve so that the cooling pathway is switched to the high temperature pathway, in a case where the storage water quantity is more than the predetermined value, and
• the storage-water-quantity increase controlling device, which the computer functions as, is configured to control the pathway switching valve so that the cooling pathway is switched to the low temperature pathway, in a case where the storage water quantity is equal to or less than the predetermined value.