Exhaust gas cleaning apparatus
US7264642B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2003 |
| Grant date | Sep 4, 2007 |
| Priority date | — |
| Expiry date | Jul 31, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S55/30
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an exhaust gas cleaning apparatus (30) in which a before and after differential pressure (ΔP) of a filter (32) used to trap particulates is detected for regeneration of the filter (32), a time at which, during filter regeneration, the temperature of the outlet section of the filter (32) falls below the temperature of the inlet section thereof (ΔT>M), using a first temperature sensor (36) and a second temperature sensor (37), is determined as being the timing of the completion of the regeneration of the filter (32). The value of the before and after differential pressure (ΔP) at the time of this regeneration completion is used to estimate the quantity of residual ash in the filter (32), and when this estimated residual ash quantity is the same as, or greater than, a prescribed value (PX), a replacement warning signal (K3) is output urging replacement of the filter (32).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.