Methods for assessing the degree of deterioration of engine oil considering new oil supplementation

摘要

(57) [Abstract] The present invention is directed to methods for assessing the degree of deterioration of engine oil based on viscosity measurements taking into account the supply of new oil. Here, the replenishment amount of new oil is detected by the oil level sensor first, (η ₂₎ sought viscosity of the mixed oil of new oil and engine oil by the oil viscosity sensor then, in an electronic evaluation circuit oil amount in the previous (V new amount of oil that has been added from the difference between ₁₎ a new amount of oil (V ₂₎ (V _n) is obtained, a new viscosity of supply and immediately after (η ₁₎ engine oil viscosity old replenishment just before from (η ₂₎ oil viscosity (η _n) is obtained, the old engine oil viscosity in a new state with (η _0), engine oil level existing supply point and (V _1), a new oil viscosity was calculated to be (η _n) , is calculated as a new reference value has been corrected (η _'0) hypothetical initial viscosity value from the new amount of oil was calculated (V _n).