| 摘要 |
The present invention relates to a cooling system of a cylinder head integrated with an exhaust device capable promoting an improvement of fuel efficiency in accordance with a reduction in an exhaust gas temperature by elongating a water jacket of the cylinder head to the exhaust side. A newly formed cooling system is implemented, wherein a head unit side formed on the cylinder head and respective cooling water flow passages on an exhaust port elongation unit are separately operated while the cooling water flow passages of the exhaust port elongation unit are selectively opened or closed in accordance with an the operation domain. Thereby, while maintaining an advantage of the cylinder head integrated with an exhaust device, the improvement of fuel efficiency due to a decrease in an initial LOT time, and an improvement of heating can be promoted at the same time. |
