| 摘要 |
PROBLEM TO BE SOLVED: To reduce the deterioration of the lubricating performance of lubricating oil due to DME fuel leaking into a cam chamber of an injection pump. SOLUTION: A bypass control part 30 ON/OFF-controls a three-way solenoid valve 62 in accordance with a detection value detected by a sensor 12a in the cam chamber. When a detection value for the viscosity of the lubricating oil, detected by the sensor 12a in the cam chamber, exceeds a preset allowable value, the three-way solenoid valve 62 is ON-controlled to communicate an oil separator 13 at its outlet side with a bypass line 61. The cam chamber 12 is depressurized to the atmospheric pressure or lower by using a compressor 16 for suction in the state of a check valve 14 being bypassed for restricting pressure in the cam chamber 12 to be the atmospheric pressure or higher. At the time when the detection value for the viscosity of the lubricating oil, output by the sensor 12a in the cam chamber, is the preset allowable value or smaller, the three-way solenoid valve 62 is OFF-controlled to communicate the oil separator 13 at its outlet side with the check valve 14 and shut off the bypass line 61. COPYRIGHT: (C)2004,JPO |
