| 摘要 |
PROBLEM TO BE SOLVED: To always retain an optimum lubricating property by simple control with switching of a map even when a plurality of kinds of fuels of different composition are switched and used. SOLUTION: This device is equipped with a plurality of control maps 31a, 31b and 31c that define the relationship between on-off condition of an electromagnetic switch valve 25 preset for every composition of plurality of kinds of fuels and setting viscosity of the fuel under a predetermined condition and a present fuel temperature. A fuel temperature adjusting means 21 is controlled so that the control maps 31a, 31b and 31c are selected according to the composition of the fuel used to make the used fuel to a pre-stored temperature based on the maps. Even when the plurality of kinds of fuels of different compositions are switched and used, an optimum lubricating property is always retained by simple control with switching of the control maps 31a, 31b and 31c.
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