PM accumulation amount estimation device for DPF
US9074505B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 2012 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Oct 15, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
A PM accumulation amount estimation unit 50 is provided with an exhaust amount computation unit 51 for computing PM exhaust amount which is discharged in an exhaust gas passage 3, and a passive regeneration amount computation unit 52 for computing a PM regeneration amount in a DPF 7, and is configured to estimate the PM accumulation amount in the DPF 7 from the difference between the PM exhaust amount computed by the exhaust amount computation unit 51 and the PM regeneration amount computed by the passive regeneration amount computation unit 52. The PM accumulation amount estimation unit 50 is further configured such that, when an abnormality is found in an airflow meter 31, the PM regeneration amount from NO2 is computed, and the PM accumulation amount in the DPF is estimated, without using the airflow amount measured by the airflow meter 31.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.