ON-BOARD METHOD AND SYSTEM FOR MONITORING ONSET OF RAPID OIL OXIDATION AND SLUDGE FORMATION IN ENGINE OILS
First Claim
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1. A method comprising:
- providing an engine having a quantity of engine oil;
determining a size of viscosity hysteresis of said quantity of engine oil in a heating-cooling cycle as a function of a measured temperature of said quantity of engine oil; and
determining a state of engine oil degradation in said quantity of engine oil from said heating-cooling cycle as a function of said determined size of hysteresis for said heating-cooling cycle.
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Abstract
In one exemplary embodiment, the state of engine oil degradation is monitored and determined using the size of viscosity hysteresis during heating-cooling cycles. In another exemplary embodiment, the state of engine oil degradation is monitored and determined using the sign of viscosity hysteresis during heating-cooling cycles. In yet another exemplary embodiment, the state of engine oil degradation is monitored and determined using relative viscosity changes hysteresis during heating-cooling cycles.
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Citations
20 Claims
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1. A method comprising:
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providing an engine having a quantity of engine oil; determining a size of viscosity hysteresis of said quantity of engine oil in a heating-cooling cycle as a function of a measured temperature of said quantity of engine oil; and determining a state of engine oil degradation in said quantity of engine oil from said heating-cooling cycle as a function of said determined size of hysteresis for said heating-cooling cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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providing an engine having a quantity of engine oil; determining a first sign of hysteresis of said quantity of engine oil in a first heating-cooling cycle of said quantity of engine oil; determining a second sign of hysteresis of said quantity of engine oil in a subsequent heating-cooling cycle of said quantity of engine oil; and determining a state of engine oil degradation for said quantity of engine oil by comparing said first sign of hysteresis to said second sign of hysteresis. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method comprising:
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providing an engine having a quantity of engine oil; heating said quantity of engine oil from a first predetermined temperature to a second predetermined temperature; measuring a first set of viscosity values at one or more temperatures for said quantity of engine oil as said quantity of engine oil is heated between said first predetermined temperature and said second predetermined temperature; subsequently cooling said quantity of engine oil from said second predetermined temperature to said first predetermined temperature; measuring a second set of viscosity values for said quantity of engine oil at one or more temperatures as said quantity of engine oil is cooled from said second predetermined temperature to said first predetermined temperature; subsequently heating said quantity of engine oil from said first predetermined temperature to said second predetermined temperature; measuring a third set of viscosity values at one or more temperatures for said quantity of engine oil as said quantity of oil is reheated subsequently heated from said first predetermined temperature to said second predetermined temperature; subsequently cooling said quantity of engine oil from said second predetermined temperature to said first predetermined temperature; measuring a fourth set of viscosity values at one or more temperatures for said quantity of engine oil as said quantity of oil is subsequently cooled from said second predetermined temperature to said first predetermined temperature; comparing said first set of viscosity values to said third set of viscosity values and comparing said second set of viscosity values to said fourth set of viscosity values at a predetermined temperature to determine a relative viscosity change in successive thermal cycles at said predetermined temperature; and determining a state of engine oil degradation in said quantity of engine oil in said successive thermal cycles as a function of said determined relative viscosity change. - View Dependent Claims (20)
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Specification