Method for heating an exhaust system

Patent metadata

Field	Value
Publication number	US-11834977-B2
Application number	US-202217988462-A
Country	US
Kind code	B2
Filing date	Nov 16, 2022
Priority date	Nov 17, 2021
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

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 ). In one example, the method includes determining a current temperature (t_EHC, t_EHC{circumflex over ( )}Us, t_Cat) in the exhaust system ( 120 ), determining a heating demand (t_EHC{circumflex over ( )}Des) based on the determined current temperature (t_Cat) and a target temperature, calculating a required amount of heat (Pwr{circumflex over ( )}Des) on the basis of the heating demand and an amount of energy required to heat the electric heating device ( 14, 15 ), and controlling (Pwr{circumflex over ( )}Req) the electric heating device ( 14, 15 ) to generate the calculated amount of heat.

First claim

The invention claimed is:

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{circumflex over ( )}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{circumflex over ( )}Des) on the basis of the determined current temperature (t_Cat) and a target temperature,
calculating a required amount of heat (Pwr{circumflex over ( )}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{circumflex over ( )}Des), and
controlling (Pwr{circumflex over ( )}Req) the electric heating device ( 14 , 15 ) to generate the calculated amount of heat.

2. The method ( 200 ) according to claim 1 , further comprising controlling a fluid flow ( 10 ) for transporting heat from the heating device ( 14 , 15 ) to a component ( 11 , 12 , 13 ) of the exhaust system ( 120 ) to be heated.

3. The method ( 200 ) according to claim 2 , wherein the component ( 11 , 12 , 13 ) to be heated comprises a catalyst and/or a particulate filter.

4. The method ( 200 ) according to claim 2 , wherein the fluid flow ( 10 ) for extracting heat from the heating device ( 14 , 15 ) is controlled if the heating device ( 14 , 15 ) reaches a predeterminable minimum temperature.

5. The method ( 200 ) according to claim 1 , wherein the target temperature is determined on the basis of one or more operating parameters of the exhaust system ( 120 ).

6. The method ( 200 ) according to claim 5 , wherein the one or more operating parameters of the exhaust system ( 120 ) comprise a pollutant concentration in the exhaust system and/or a pressure drop within the exhaust system and/or an exhaust mass flow (dm_Exh) in the exhaust system and/or an ambient temperature.

7. A system for controlling an exhaust system ( 120 ) located downstream of an internal combustion engine ( 1 ), the system comprising:
an electric heating device ( 14 , 15 ); and
a computer configured to:
determine a current temperature (t_EHC, t_EHC{circumflex over ( )}Us, t_Cat) in the exhaust system ( 120 ) on the basis of a temperature model of the exhaust system ( 120 ),
determine a heating demand (t_EHC{circumflex over ( )}Des) on the basis of the determined current temperature (t_Cat) and a target temperature,
calculate a required amount of heat (Pwr{circumflex over ( )}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{circumflex over ( )}Des), and
control (Pwr{circumflex over ( )}Req) the electric heating device ( 14 , 15 ) to generate the calculated amount of heat.

8. A non-transitory, computer-readable storage medium containing instructions that when executed by aa computer cause the computer to control an exhaust system ( 120 ) located downstream of an internal combustion engine ( 1 ) and having an electric heating device ( 14 , 15 ), by:
determining a current temperature (t_EHC, t_EHC{circumflex over ( )}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{circumflex over ( )}Des) on the basis of the determined current temperature (t_Cat) and a target temperature,
calculating a required amount of heat (Pwr{circumflex over ( )}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{circumflex over ( )}Des), and
controlling (Pwr{circumflex over ( )}Req) the electric heating device ( 14 , 15 ) to generate the calculated amount of heat.

Assignees

• Bosch Gmbh Robert

Inventors

• Bachner Michael
• Ernst Jonas
• Koch Rolf-Dieter
• Harman Tahir
• Zein Thomas
• Kossatz Uwe

Classifications

• F01N3/2026 Primary

  directly electrifying the catalyst substrate, i.e. heating the electrically conductive catalyst substrate by joule effect · CPC title

• B01D53/9454

  characterised by a specific device · CPC title

• B01D53/9495

  Controlling the catalytic process · CPC title

• F01N3/023

  using means for regenerating the filters, e.g. by burning trapped particles · CPC title

• F01N2240/16

  an electric heater, i.e. a resistance heater · CPC title