Method of monitoring engine lubricant condition
US6513368B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 28, 2002 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Jun 28, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01M2011/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for generating indicators relating to the condition of lubricating oil in an internal combustion engine. A set of variables relating to operation of the internal combustion engine serve as proxy variables for brake mean effective pressure developed by the internal combustion engine. Operation of an engine is monitored to develop values for the proxy variables. Soot being added to the lubricating oil from the developed values and accumulated to provide an estimate of total soot in the lubricating oil. Lubricating oil temperature is periodically monitored and a history of the lubricating oil temperature measurements is kept to allow generation therefrom of an estimate of shear of the lubricating oil. Accumulated estimate of soot is kept as a distance remaining until the lubricating oil becomes unsuitable for continued use in the internal combustion engine. Similarly, estimated shear is expressed as a distance until the lubricating oil is to be replaced. Additional factors may be monitored and similarly used to determine the distance until an oil change is required, including the dielectric coefficient of the lubricating oil, temperature history of the oil and total cylinder …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.