Patent ID: 7281414

Claim:
An apparatus for scanning states of engine oil, comprising: an oil property measuring part for measuring physical and chemical properties of engine oil; a driving condition measuring part for measuring an engine driving condition; a control portion where conditions of engine oil corresponding to engine driving conditions are stored as set values, for selecting a set value for a state of engine oil corresponding to the measured engine driving condition, and calculating a result value regarding a quality of engine oil on the basis of comparison of a measured value for the state of engine oil inputted from the driving condition measuring part and the set value; and an output part for outputting a predetermined output depending on the result value; wherein the oil property measuring part is a complex sensor comprising: a cylindrical case having a hollow space therein; an oil level sensor, an oil oxidation degree sensor, an oil viscosity sensor, and an oil temperature sensor installed in the case; and a DSP for calculating values for physical and chemical properties of engine oil, on the basis of values measured by each of the sensors, wherein the oil level sensor comprises an input electrode having a shape of a pipe, installed in the case, and formed such that an electric current can be applied thereto, and an oil level electrode having a shape of a pipe, disposed apart from an inner surface of the input electrode, and formed to receive an electric current from the input electrode, the oil oxidation degree sensor comprises the input electrode, and an oil oxidation degree electrode having a shape of a pipe, disposed at a lower portion of the oil level electrode, and formed to receive an electric current applied from the input electrode, the oil viscosity sensor comprises a piezoelectric element and a metal membrane covering the piezoelectric element, and the oil temperature sensor is mounted to the case.