| 摘要 |
PURPOSE:To prevent the bearing loss and improve the durability of a bearing by adjusting the amount of lubricating oil supplied into a turbocharger by the revolution speed of the turbocharger. CONSTITUTION:When the revolution speed of a surbocharger 3 is as low as 20,000, and each of the temperature difference detected between the temperature sensors 13 and 15 and the temperature difference of the lubricating oil on the inlet and outlet sides of the turbocharger 3 is less than 20 deg.C, and the temperature sensor 15 detects a temperature of 80 deg.C or less, the discharge amount of an electrically driven pump 11 is reduced. When the revolution speed of the turbocharger 3 is as low as 20,000 r.p.m., and the temperature difference of the lubricating oil between the inlet and outlet sides of the turbocharger 3 is 80 deg.C or more, and the oil temperature on the outlet side is at least 160 deg.C, the discharge amount of the electrically driven pump 11 is increased.
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