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US 8,109,138 B2Granted
Method and system for estimating engine oil life based on viscosity
AssigneeGM Global Technology Operations LLC
InventorsTaeyoung Han, Liyun Zheng
Life of this patent
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Abstract
A method and control module for indicating engine oil life includes a viscosity determination module determining a viscosity of the engine oil based on an engine oil pressure and engine oil temperature. The control system further includes a comparison module comparing the viscosity of the engine oil to a threshold and generating a warning signal in response to comparing the viscosity.
Claims20
A method comprising:
- determining an engine oil pressure;
- determining an engine oil temperature;
- determining a viscosity of engine oil based on the engine oil pressure and the engine oil temperature when the engine oil pressure is regulated;
- comparing the viscosity of the engine oil to a threshold;
- and
- generating a warning signal in response to comparing the viscosity.
3 more elements
A method comprising:
- determining a new oil viscosity;
- determining a used oil viscosity;
- and
- generating an indicator corresponding to oil life when a ratio of the used oil viscosity to the new oil viscosity is outside of a range, wherein at least one of the new oil viscosity and the used oil viscosity is determined when engine oil pressure is regulated.
1 more element
A control system for indicating engine oil life comprising:
- a viscosity determination module determining a viscosity of engine oil based on an engine oil pressure and engine oil temperature when the engine oil pressure is regulated;
- and
- a comparison module comparing the viscosity of the engine oil to a threshold and generating a warning signal in response to comparing the viscosity.
Dependencies are inferred from the claim text.