| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a cooling medium circulation system for an engine capable of properly controlling the state of cooling medium supply according to an object to be treated so that the object by the cooling medium of the engine can be properly operated. <P>SOLUTION: This cooling water circulation system 100 is so structured that a cooling water is fed from a water pump 113 to a cylinder head 111 through a pump feedout pipe 114. The system 100 is so structured that the supplied state of the cooling water from the cylinder head 111 to a cylinder block 112 can be selected by an engine block cooling selector part 170 according to the temperature of the cooling water. An EGR cooler branch pipe 151 installed to be branched from the pump feedout pipe 114 is connected to an EGR cooler 150. An EGR cooler cooling selector valve 153 opened and closed according to the operating conditions such as the output of a water temperature sensor 115 is interposed in the EGR cooler branch pipe 151. <P>COPYRIGHT: (C)2007,JPO&INPIT |
