Method for determining the condition of engine oil based on soot modeling
First Claim
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1. A method for determining the condition of lubricating oil in an internal combustion engine, including the steps of:
- determining a plurality of parameters associated with the engine;
determining a model of the duration of injection of fuel into a cylinder in the engine;
determining a wall area of the cylinder that is coated with soot during injection;
determining a model of the soot in the oil as a function of the parameters, the fuel injection duration model, and the coated wall area; and
responsively determining the condition of the oil.
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Abstract
A method for monitoring the condition of oil in an engine is disclosed which includes the steps of determining a plurality of parameters, determining a fuel injection model, determining the area of the cylinder walls that is coated with soot, and responsively determining a soot model. The method may include the additional steps of calculating a value of residual soot, and calculating a value of soot dispersed by dispersants. The accumulation of soot determined from the model may be trended over time to predict the useful life of the oil.
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Citations
30 Claims
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1. A method for determining the condition of lubricating oil in an internal combustion engine, including the steps of:
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determining a plurality of parameters associated with the engine; determining a model of the duration of injection of fuel into a cylinder in the engine; determining a wall area of the cylinder that is coated with soot during injection; determining a model of the soot in the oil as a function of the parameters, the fuel injection duration model, and the coated wall area; and responsively determining the condition of the oil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for determining the condition of oil in an internal combustion engine, including the steps of:
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determining a plurality of parameters associated with the engine; determining a model of the duration of injection of fuel into a cylinder in the engine; determining a wall area of the cylinder that is coated with soot during injection; calculating a value of residual soot in the engine as a function of the engine geometry and at least one occurrence of replacing the used engine oil with new engine oil; calculating a value of soot dispersed by dispersants in the engine oil as a function of at least one occurrence of replacing the used engine oil with new engine oil; determining a model of the soot in the oil as a function of the parameters, the coated wall area, the residual soot, and the dispersed soot; and responsively determining the condition of the oil.
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25. A model for determining the condition of oil in an internal combustion engine, comprising:
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a fuel injection duration model for determining a start of injection, an end of injection, and a duration of injection of fuel into a cylinder in the engine; a crank model for receiving the determined data from the fuel injection duration model, and responsively determining the area exposed to injection of fuel in an inner wall of the cylinder; and a soot model for receiving the determined data from the crank model and for receiving a plurality of parameters associated with the engine, responsively determining a value of soot in the oil, and responsively determining the condition of the oil. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification