US 11,834,977 B2
Method for heating an exhaust system
Michael Bachner, Stuttgart (DE); Jonas Ernst, Stuttgart (DE); Rolf-Dieter Koch, Ditzingen (DE); Tahir Harman, Ludwigsburg (DE); Thomas Zein, Sindelfingen (DE); and Uwe Kossatz, Korntal-Muenchingen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Filed by Robert Bosch GmbH, Stuttgart (DE)
Filed on Nov. 16, 2022, as Appl. No. 17/988,462.
Claims priority of application No. 102021212923.4 (DE), filed on Nov. 17, 2021.
Prior Publication US 2023/0151752 A1, May 18, 2023
Int. Cl. F01N 3/20 (2006.01); B01D 53/94 (2006.01); F01N 3/023 (2006.01)
CPC F01N 3/2026 (2013.01) [B01D 53/9454 (2013.01); B01D 53/9495 (2013.01); F01N 3/023 (2013.01); F01N 2240/16 (2013.01); F01N 2900/1404 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method (200) for heating an exhaust system (120) downstream of an internal combustion engine (1) by means of an electric heating device (14, 15), the method comprising:
determining a current temperature (t_EHC, t_EHC Us, t_Cat) in the exhaust system (120) on the basis of a temperature model of the exhaust system (120),
determining a heating demand (t_EHC Des) on the basis of the determined current temperature (t_Cat) and a target temperature,
calculating a required amount of heat (Pwr Des) on the basis of the heating demand, an amount of energy required to heat the electric heating device (14, 15), and the temperature model of the exhaust system (120), wherein the temperature model of the exhaust system (120) comprises a plurality of physical equations, wherein the physical equations are inverted to directly determine the required amount of heat (Pwr Des), and
controlling (Pwr Req) the electric heating device (14, 15) to generate the calculated amount of heat.