Exhaust purification device and method of calculating NH3 mass generated in lean NOx trap of exhaust purification device

US9771846B2 · kind B2 · utility

Assignees

• HYUNDAI MOTOR COMPANY · KR
• FEV Group GmbH · DE

Inventors

• Jin Ha Lee · Seoul, KR
• Jin-Woo Park · Suwon-si, KR
• Joschka Schaub · Aachen, DE
• Alexander Vovk · Aachen, DE
• Thomas Wittka · Hachenburg, DE

Key dates

• Filing date: Nov 30, 2015
• Grant date: Sep 26, 2017
• Expiry date: Dec 10, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method of calculating an ammonia (NH3) mass generated in a lean NOx trap (LNT) of an exhaust purification device includes sequentially calculating a NH3 mass flow at a downstream of each slice from a first slice to an n-th slice, and integrating the NH3 mass flow at the downstream of the n-th slice over a predetermined time, wherein the calculation of the NH3 mass flow at the downstream of the i-th slice comprises calculating a NH3 mass flow flowing into the i-th slice, calculating a NH3 mass flow generated at the i-th slice, and adding the NH3 mass flow generated at the i-th slice to a value obtained by subtracting the NH3 mass flow used to reduce the NOx and the O2 at the i-th slice from the NH3 mass flow flowing into the i-th slice.