Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2007-07-19
2010-11-02
Dunn, Drew A (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C123S1960CP
Reexamination Certificate
active
07826987
ABSTRACT:
Provided is a method for detecting a condition of engine oil that allows the progress of degradation of engine oil to be more accurately determined without incurring any significant cost. In a method for detecting a state of engine oil by defining a degradation index that changes with a progress in degradation of the engine oil that lubricates an internal combustion engine and determining a progress of the degradation of the engine oil according to the degradation index, a value related to a concentration of blow-by gas that flows into a crankcase of the engine is computed, and the degradation index is computed according to the computed value related to a concentration of blow-by gas that flows into a crankcase of the engine. The degradation index may consist of a total base number of the engine oil, and the concentration of blow-by gas that flows into a crankcase of the engine may consist of a NOx concentration.
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Arent & Fox LLP
Dunn Drew A
Honda Motor Co. Ltd.
Vo Hien X
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