| 摘要 |
PROBLEM TO BE SOLVED: To restrain a temperature of an exhaust pipe from becoming an abnormally high temperature.SOLUTION: An exhaust pipe temperature control device 7 for an engine, includes: an exhaust gas temperature predicting section 77a for predicting a temperature of exhaust gas based on an operation state of the engine 1; an exhaust pipe temperature predicting section 77b for predicting a temperature of an exhaust pipe based on the exhaust gas temperature predicted by the exhaust gas temperature predicting section 77a, an exhaust pipe heat capacity coefficient, and a heat radiation coefficient based on wind velocity in an engine room; and a control section 77d for performing rotation speed increase control for increasing rotation speed of a cooling fan 5 when predicted exhaust pipe heat quantity related to the exhaust pipe temperature predicted by the exhaust pipe temperature predicting section 77b is larger than first prescribed heat quantity. |
