US 11,808,196 B2
Method of detecting a need for regeneration of an exhaust particulate filter, and exhaust system
Dominik Gschwend, Elsau (CH); Adrian Marberger, Elsau (CH); Marc Hehle, Elsau (CH); Simon Schiegg, Elsau (CH); and Dominik Frueh, Elsau (CH)
Assigned to HUG Engineering AG
Filed by HUG Engineering AG, Elsau (CH)
Filed on May 24, 2022, as Appl. No. 17/751,846.
Claims priority of application No. 10 2021 113 763.2 (DE), filed on May 27, 2021.
Prior Publication US 2022/0381173 A1, Dec. 1, 2022
Int. Cl. F01N 9/00 (2006.01); B01D 46/00 (2022.01); B01D 46/44 (2006.01); B01D 53/94 (2006.01); F01N 3/023 (2006.01); F01N 3/10 (2006.01); F01N 3/20 (2006.01); F01N 11/00 (2006.01)
CPC F01N 9/002 (2013.01) [B01D 46/0086 (2013.01); B01D 46/444 (2013.01); B01D 46/448 (2013.01); B01D 53/944 (2013.01); B01D 53/9431 (2013.01); F01N 3/023 (2013.01); F01N 3/106 (2013.01); F01N 3/2066 (2013.01); B01D 2279/30 (2013.01); F01N 3/0231 (2013.01); F01N 3/0233 (2013.01); F01N 3/2093 (2013.01); F01N 9/005 (2013.01); F01N 11/002 (2013.01); F01N 11/005 (2013.01); F01N 2550/04 (2013.01); F01N 2550/12 (2013.01); F01N 2560/07 (2013.01); F01N 2560/08 (2013.01); F01N 2900/1404 (2013.01); F01N 2900/1406 (2013.01); F01N 2900/16 (2013.01); F01N 2900/1808 (2013.01); F01N 2900/1811 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of detecting a need for regeneration of an exhaust particulate filter, comprising the steps of:
(a) detecting a first pressure drop in a flow section of an exhaust system comprising the exhaust particulate filter, the flow section being connected to the exhaust particulate filter in a fluidically unbranched manner;
(b) sensing an exhaust gas temperature;
(c) calculating an exhaust gas mass flow flowing through the exhaust particulate filter on the basis of the first pressure drop and the exhaust gas temperature;
(d) determining a second pressure drop across the exhaust particulate filter; and
(e) identifying the need for regeneration when the second pressure drop exceeds a predefined pressure limit value dependent on the exhaust gas mass flow.