| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling control device of an engine which suppresses knocking by lowering temperatures of cylinder heads when an operation state of the engine exists in a knocking region.SOLUTION: A cooling control device of an engine comprises: a first pump 22 for making cooling water circulate to a first cooling water circulation path 20 which passes through cylinder heads 12L, 12R, and cylinder blocks 14L, 14R; a first cooling device 30 which cools the cooling water circulating in the first cooling water circulation path; a second pump 42 for making the cooling water circulate to a second cooling water circulation path 40 which passes through the cylinder heads; a second cooling device which cools the cooling water circulating in the second cooling water circulation path; a bypass passage 54 which is branched from a downstream side of the second pump and from an upstream side of the cylinder heads, and merged with an upstream side of the second cooling device; a flow passage changeover valve 44 which is arranged at a branched position of the bypass passage, and makes a discharge port of the second pump communicate with the cylinder head side or the bypass passage side; and a control device 200 which controls the second pump and the flow passage changeover valve.SELECTED DRAWING: Figure 1 |
