| 摘要 |
PROBLEM TO BE SOLVED: To always keep the temperature of fuel supplied to an engine at allowable temperature or lower by increasing fuel, which flows in a lubricating oil cooler, to the flow rate compensating for excessive temperature rise of lubricating oil led into the lubricating oil cooler. SOLUTION: In the control unit 51 of a fuel control unit 5, the fuel flow rate Wf of an engine is calculated on the basis of detecting signals of an air temperature T, an engine rotational speed N, an air pressure P, and the like. In the control unit 51, a flow rate increasing rateΔWf is found out on the basis of temperature detecting signals of a fuel inlet temperature sensor 8 and a fuel outlet temperature sensor 9 so as to prevent the fuel temperature of a cooler outlet from exceeding a temperature allowable value which is set per fuel, and the increasing rateΔWf is transmitted to a flow rate regulating unit 52. Therefore, the flow rate regulating unit 52 is controlled so as to make the flow rate of Wf +ΔWf flow into the lubricating oil cooler 6, and also the opening degree of a return valve 11 is regulated to an opening degree which fuel having the flow rate increasing rateΔWf flows, and a flow rate is controlled so as to return the flow rate increasing rateΔWf of the lubricating oil cooler 6 into a fuel tank 1 passing a return circuit 10.
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