초록 ▼

A method for determining oil viscosity includes measuring an oil viscosity parameter value while an oil pump pumps oil through an engine lubrication system. Thereafter, the oil viscosity parameter value is compared to a stored look-up table of oil viscosity parameter values versus oil viscosity valu

A method for determining oil viscosity includes measuring an oil viscosity parameter value while an oil pump pumps oil through an engine lubrication system. Thereafter, the oil viscosity parameter value is compared to a stored look-up table of oil viscosity parameter values versus oil viscosity values and the viscosity of the oil contained within the vehicle lubrication system is interpolated from the table. The look-up table is generated by installing the pump in a test system and then, measuring the oil viscosity parameter value as the pump pumps oils of known viscosities. For increased accuracy, the look-up table is generated for several temperatures within the range of normal engine operating temperatures and several pump speeds within the range of normal operating pump speeds.

대표청구항 ▼

A method for determining oil viscosity includes measuring an oil viscosity parameter value while an oil pump pumps oil through an engine lubrication system. Thereafter, the oil viscosity parameter value is compared to a stored look-up table of oil viscosity parameter values versus oil viscosity valu

A method for determining oil viscosity includes measuring an oil viscosity parameter value while an oil pump pumps oil through an engine lubrication system. Thereafter, the oil viscosity parameter value is compared to a stored look-up table of oil viscosity parameter values versus oil viscosity values and the viscosity of the oil contained within the vehicle lubrication system is interpolated from the table. The look-up table is generated by installing the pump in a test system and then, measuring the oil viscosity parameter value as the pump pumps oils of known viscosities. For increased accuracy, the look-up table is generated for several temperatures within the range of normal engine operating temperatures and several pump speeds within the range of normal operating pump speeds. a fixed sample loop, a dead volume channel and a pre-column inlet channel of the injector. 18. The method of claim 9, wherein the back-flushing step comprises allowing carrier gas to displace any sample in a pre-column. 19. A micro-machined back-flush injector comprising: a sample inlet; an analytical column inlet channel; a plurality of channels that connect the sample inlet and the analytical column inlet channel, wherein the plurality of channels include a fixed sample loop connecting a sample valve and a fore-flush valve in the injector; and a dead volume channel connecting the sample valve and an injection valve. 20. A method of operating a back-flush injector comprising: introducing a sample into the injector; injecting the sample into an analytical device; purging substantially all of the sample from the injector; and allowing a carrier gas to push the sample through a dead volume channel.