### Abstract

Original language | English |
---|---|

Title of host publication | Proceedings of the 17th Nordic Process Control Workshop |

Editors | John Bagterp Jørgensen, Jakob Kjøbsted Huusom, Gürkan Sin |

Place of Publication | Kogens Lyngby |

Publisher | Technical University of Denmark |

Publication date | 2012 |

Pages | 204 |

ISBN (Print) | 978-87-643-0946-1 |

Publication status | Published - 2012 |

Event | 17th Nordic Process Control Workshop - Kongens Lyngby, Denmark Duration: 25 Jan 2012 → 27 Jan 2012 Conference number: 17 http://npcw17.imm.dtu.dk/ |

### Conference

Conference | 17th Nordic Process Control Workshop |
---|---|

Number | 17 |

Country | Denmark |

City | Kongens Lyngby |

Period | 25/01/2012 → 27/01/2012 |

Internet address |

### Keywords

- Extended Kalman filter
- Kalman filter
- Selective catalytic reduction

### Cite this

*Proceedings of the 17th Nordic Process Control Workshop*(pp. 204). Kogens Lyngby: Technical University of Denmark.

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*Proceedings of the 17th Nordic Process Control Workshop.*Technical University of Denmark, Kogens Lyngby, pp. 204, 17th Nordic Process Control Workshop, Kongens Lyngby, Denmark, 25/01/2012.

**State Estimation for the Automotive SCR Process.** / Zhou, Guofeng; Huusom, Jakob Kjøbsted; Jørgensen, John Bagterp.

Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research › peer-review

TY - ABST

T1 - State Estimation for the Automotive SCR Process

AU - Zhou, Guofeng

AU - Huusom, Jakob Kjøbsted

AU - Jørgensen, John Bagterp

PY - 2012

Y1 - 2012

N2 - Selective catalytic reduction (SCR) of NOx is a widely applied diesel engine exhaust gas aftertreatment technology. For advanced SCR process control, like model predictive control, full state information of the process is required. The ammonia coverage ratio inside the catalyst is difficult to measure. Therefore we design an ordinary Kalman filter as well as an extended Kalman filter to estimate the ammonia coverage. The filters are built over a first principle model with four states. Among the four states, NO, NO2 and NH3 concentration are measured by the sensors, while the ammonia coverage ratio is left to be unknown. The performance of the filters is shown by simulation with the World Harmonized transient cycle. In particular, during transient operations the extended Kalman filter performs significantly better than the ordinary Kalman filter. Since such operation regimes are always present for SCR in engine applications, we recommend to estimating the ammonia coverage using the extended Kalman filter.

AB - Selective catalytic reduction (SCR) of NOx is a widely applied diesel engine exhaust gas aftertreatment technology. For advanced SCR process control, like model predictive control, full state information of the process is required. The ammonia coverage ratio inside the catalyst is difficult to measure. Therefore we design an ordinary Kalman filter as well as an extended Kalman filter to estimate the ammonia coverage. The filters are built over a first principle model with four states. Among the four states, NO, NO2 and NH3 concentration are measured by the sensors, while the ammonia coverage ratio is left to be unknown. The performance of the filters is shown by simulation with the World Harmonized transient cycle. In particular, during transient operations the extended Kalman filter performs significantly better than the ordinary Kalman filter. Since such operation regimes are always present for SCR in engine applications, we recommend to estimating the ammonia coverage using the extended Kalman filter.

KW - Extended Kalman filter

KW - Kalman filter

KW - Selective catalytic reduction

M3 - Conference abstract in proceedings

SN - 978-87-643-0946-1

SP - 204

BT - Proceedings of the 17th Nordic Process Control Workshop

A2 - Jørgensen, John Bagterp

A2 - Huusom, Jakob Kjøbsted

A2 - Sin, Gürkan

PB - Technical University of Denmark

CY - Kogens Lyngby

ER -