Luminosity detector for internal combustion engine, method of operating engine and method of sensing temperature
US4891970A · kind A · utility
6Cited by
2References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1988 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Dec 6, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J1/0271
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A luminosity and temperature detector for an internal combustion engine and method for measuring luminosity including a light probe and photodiode that receives the light transmitted from the light probe. The photodiode is designed, constructed and biased to operate within the zero temperature coefficient portion of its range for the wavelengths being measured. In addition, the dark current is measured when there is no luminosity due to combustion and this is subtracted from the other readings to obtain temperature compensation. Furthermore, the dark current measurement will indicate the temperature of the photodiode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.