Method for detecting a condition of engine oil
First Claim
1. A method for detecting a condition of engine oil, comprising:
- defining a degradation index that changes with a progress in degradation of the engine oil that lubricates an internal combustion engine;
computing a value related to a concentration of blow-by gas that flows into a crankcase of the engine; and
computing the degradation index according to the computed value related to a concentration of blow-by gas that flows into a crankcase of the engine.
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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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Citations
17 Claims
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1. A method for detecting a condition of engine oil, comprising:
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defining a degradation index that changes with a progress in degradation of the engine oil that lubricates an internal combustion engine; computing a value related to a concentration of blow-by gas that flows into a crankcase of the engine; and computing the degradation index according to the computed value related to a concentration of blow-by gas that flows into a crankcase of the engine. - View Dependent Claims (2, 3, 4, 5, 9)
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6. A method for detecting a condition of engine oil, comprising:
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defining a degradation index that changes with a progress in degradation of the engine oil that lubricates an internal combustion engine; computing a value related to a concentration of blow-by gas that flows into a crankcase of the engine; and computing the degradation index according to the computed value related to a concentration of blow-by gas that flows into a crankcase of the engine; wherein the concentration of blow-by gas that flows into a crankcase of the engine consists of a NOx concentration. - View Dependent Claims (7, 8)
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10. A method for detecting a condition of engine oil, comprising:
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defining a degradation index that changes with a progress in degradation of the engine oil that lubricates an internal combustion engine; computing a value related to a concentration of blow-by gas that flows into a crankcase of the engine; computing a change rate of the degradation index according to the computed value related to a concentration of blow-by gas that flows into a crankcase of the engine; and computing the degradation index by integrating the computed change rate of the degradation index. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification