Method and apparatus for measuring the concentration of solid particles (soot) in the exhaust gases of internal combustion engines
US5546788A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1995 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | Jan 24, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/102
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for measuring the concentration of particles in the exhaust gas of an internal combustion engine in which the exhaust gas is mixed and diluted with air in a mixing chamber (6) and supplied to a measuring filter (4) during a measurement phase. In order to establish the dilution ratio of the exhaust gas in the mixture of exhaust gases and air, valves (10, 11) are operated to supply air from an air line (13) to a bypass line (12) during a second phase. The quantity of air flow in the air line (13) is equal to the flow quantity of the exhaust gas to the mixing chamber (6). Thereby, the ratio of the quantity of particles measured by the filter (4) to the air flow in the air line (13) represents the concentration of the particles in the exhaust gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.