INTERNAL COMBUSTION ENGINE

摘要

A low-temperature cooling water channel formed in the internal combustion engine includes a water jacket that covers at least one portion of a wall surface of an intake port. The intake port has a cooled wall surface that is covered by the water jacket, and a non-cooled wall surface that is not covered by the water jacket. An airflow control valve is provided on an intake-air upstream side of the cooled wall surface. The airflow control valve is configured to be capable of changing a ratio between a flow rate of intake air that flows along the side of the cooled wall surface and a flow rate of intake air that flows along the side of the non-cooled wall surface. The airflow control valve is preferably configured as a tumble control valve (TCV).

主权项

1. An internal combustion engine, comprising:
a low-temperature cooling water circulation system that is one of two cooling water circulation systems in which temperatures of cooling water are different, and that causes cooling water of a low temperature to circulate in a low-temperature cooling water channel formed in the internal combustion engine; and a high-temperature cooling water circulation system that is one of the two cooling water circulation systems, and that causes cooling water of a high temperature to circulate in a high-temperature cooling water channel formed in the internal combustion engine, the low-temperature cooling water channel including a water jacket covering at least one portion of a wall surface of an intake port, the intake port including: a first wall surface that is an inner wall surface covered by the water jacket at least at one cross section among cross-sections that are perpendicular to a central trajectory of the intake port and a second wall surface that is an inner wall surface not covered by the water jacket at least at the one cross section; wherein the internal combustion engine comprises an airflow control valve provided on an intake-air upstream side of the first wall surface, the airflow control valve being configured to be capable of changing a ratio between a flow rate of intake air that flows on a side of the first wall surface and a flow rate of intake air that flows on a side of the second wall surface.