| 摘要 |
PROBLEM TO BE SOLVED: To cope with viscosity reduction and pressure reduction in a working fluid, by restraining a temperature rise in the working fluid in an ancillary device without deteriorating fuel economy of an engine. SOLUTION: This cooling system has cooling water circulating passages 12 and 15 of the engine 1, a radiator 13 arranged in its circulating passages 12 and 15, and a flow control valve 16 for adjusting a cooling water flow rate in the radiator 13. An electronic control device ECU 30 controls the flow control valve 16 so that the cooling water temperature of the engine 1 becomes the target cooling water temperature. Here, the engine 1 is provided with a lubricating device 44 and an automatic transmission 45 including lubricating oil and a hydraulic fluid having thermal influence from the engine 1. An oil cooler circuit 35 is arranged in the circulating passages 12 and 15 so as to bypass the radiator 13 for cooling the lubricating oil and the hydraulic fluid. When the temperature of the lubricating oil and AFT exceeds the reference temperature, the ECU 30 changes the target cooling water temperature to the relatively low temperature. COPYRIGHT: (C)2006,JPO&NCIPI
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