| 摘要 |
PROBLEM TO BE SOLVED: To provide an engine cooling water circuit capable of shortening warming-up time, and capable of sufficiently cooling an EGR cooler after finishing warming-up. SOLUTION: This engine cooling water circuit has a first water passage 32 connecting a first cooling water pipe 14 to an EGR cooler inlet 43, a second water passage 33 connecting an EGR cooler outlet 44 to a third cooling water pipe 20, a third water passage 34 connecting the third cooling water pipe 20 on the upstream side of the second water passage 33 to the first water passage 32, a fourth water passage 36 connecting the second water passage 33 to a second cooling water pipe 17 on the downstream side of a thermostat 10, a first solenoid valve 26 opening and closing the first water passage 32 on the upstream side of the third water passage 34, a fourth solenoid valve 29 opening and closing the second water passage 33 on the downstream side of the fourth water passage 36, a pump 35 sending cooling water to the first water passage 32 side from the third cooling water pipe 20 side, a second solenoid valve 27 opening and closing the third water passage 34 on the downstream side of the pump 35, a third solenoid valve 28 opening and closing the fourth water passage 36, a water temperature detecting means 30 detecting the engine outlet water temperature, and a control means 31 controlling the pump 35 for ON/OFF and controlling opening-closing of the solenoid valves on the basis of this detecting temperature. COPYRIGHT: (C)2008,JPO&INPIT
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