| 摘要 |
According to an aspect of the invention, there is provided an aircraft comprising a fuel system. The fuel system comprises a flow meter, a control unit coupled thereto and a means for measuring volumetric flow rate of flowing fuel within the fuel system. Additionally, the flow meter comprises a viscosity measurement device which is disposed within the fuel system such that it is exposed in use, at least in part, to fuel. The viscosity measurement device is for measuring, in real time, a value indicative of the viscosity of the fuel. In this way, the control unit can accurately determine a density of the flowing fuel and can accurately determine a mass of the flowing fuel as it is loaded onto, used by or distributed about the aircraft. Also claimed is an oil lubrication system for a vehicle comprising a viscosity measurement device configured and arranged for measuring a value indicative of the viscosity of the oil for use in indicating when an oil change is required, the viscosity measurement device comprising: a housing having an inlet and an outlet for enabling ingress and egress of oil into and out of the housing and a cantilevered arm secured within the housing, the cantilevered arm being affixed at one end and having a moveable second end, said value indicative of the viscosity of the oil is intermittently measured by deflecting the cantilevered arm when disposed within substantially static oil held within the housing, the viscosity measurement device having means for outputting said value indicative of the viscosity of the oil to a control unit configured to determine the absolute viscosity and configured to determine that an oil change is required due to a decrease in the absolute viscosity of the oil below an acceptable threshold viscosity. |
