On-board method and system for monitoring onset of rapid oil oxidation and sludge formation in engine oils
US8355880B2 · kind B2 · utility
1Cited by
1References
20Claims
0Family size
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Key dates
| Filing date | Nov 24, 2009 |
| Grant date | Jan 15, 2013 |
| Priority date | — |
| Expiry date | Dec 8, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2011/0093
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.