Method of and apparatus for monitoring operation of a catalytic converter
US5177463A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1991 |
| Grant date | Jan 5, 1993 |
| Priority date | — |
| Expiry date | Feb 14, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Sensors measure the temperatures of exhaust gas upstream and downstream of a catalytic converter for internal combustion engine exhaust gas. The difference between the temperatures is multiplied by the rate of mass flow of exhaust gas and the result is integrated or low pass filtered to provide a measure of converter operation. Alternatively, the multiplication is omitted and the difference between the temperatures is integrated or filtered. Thus, the performance of the catalytic converter is monitored by evaulating the difference in the heat supplied to the catalytic converter and the heat removed from the catalytic converter by the exhaust gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.