Closed loop temperature control in the SCR warm up mode to reduce emission variation
US8931265B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 10, 2012 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Dec 13, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An exhaust aftertreatment system for a diesel engine includes a selective catalytic reduction (SCR) device and a diesel oxidation catalyst upstream of the SCR device. A method for warming-up the SCR device includes monitoring a plurality of combustion input parameters during an SCR warm-up strategy, monitoring a first temperature and a second temperature within the aftertreatment system, providing a feedback adjustment term as a function of a deviation in the first temperature from a desired temperature only when the monitored first and second temperatures are within a predetermined adjustment range, and initiating an adjusted SCR warm-up strategy based on the feedback adjustment term to converge the first temperature toward the desired temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.