Method for operating a fuel-operated burner

Patent metadata

Field	Value
Publication number	US-11988129-B2
Application number	US-202318170311-A
Country	US
Kind code	B2
Filing date	Feb 16, 2023
Priority date	Feb 17, 2022
Publication date	May 21, 2024
Grant date	May 21, 2024

Abstract

A method for operating a fuel-operated burner (3) downstream of an engine (1) and upstream of a catalytic converter (4), comprising an actuation of an ignition apparatus (12) of the burner (3) during a pre-definable preheating phase, without delivering fuel (11) to the burner (3) during the preheating phase, and, after the end of the preheating phase, a timely delivery of fuel (11) to the burner (3) and combustion of the delivered fuel (11) in the burner (3). Further, a computing unit and a computer program product for carrying out such a method are proposed.

First claim

The invention claimed is:

1. A method for operating a burner ( 3 ) to introduce burning gases or burning exhaust gas into an exhaust system downstream of an engine ( 1 ) and upstream of a catalytic converter ( 4 ), the method comprising:
actuating a fuel metering device ( 10 ) to deliver fuel ( 11 ) to the burner ( 3 ) starting at a meter time (t 1 ),
actuating an ignition apparatus ( 12 ) of the burner ( 3 ) such that it ignites at an ignition time (t 0 ) and subsequently burns for a burning duration ( 304 ), and
determining the meter time (t 1 ) and/or the ignition time (t 0 ), such that fuel delivered to the burner ( 3 ) at the meter time (t 1 ) is not deposited in the burner prior to the ignition time but reaches the ignition apparatus at ignition time (t 0 ) or during the burning duration ( 304 ),
wherein the ignition apparatus is a spark plug and
wherein the burning duration is a time during which an energy of an ignition coil of the spark plug discharges to a secondary side of the spark plug.

2. The method according to claim 1 , wherein the determining of the meter time (t 1 ) and/or the ignition time (t 0 ) is carried out such that fuel delivered to the burner ( 3 ) at the meter time (t 1 ) reaches the ignition apparatus ( 12 ) at the ignition time or during the burning duration ( 304 ) as a function of a distance between the fuel metering device ( 10 ) and the ignition apparatus ( 12 ) and/or as a function of a mean advancement speed of the fuel between the fuel metering device ( 10 ) and the ignition apparatus ( 12 ).

3. The method according to claim 1 , comprising the following step before and/or during the actuation of the fuel metering device ( 10 ) for delivering fuel ( 11 ) to the burner ( 3 ), starting at the meter time (t 1 ):
actuating the ignition apparatus ( 12 ) of the burner ( 3 ) without igniting fuel.

4. The method according to claim 1 , comprising the following step before the actuation of the fuel metering device ( 10 ) for delivering fuel ( 11 ) to the burner ( 3 ), starting at the meter time (t 1 ):
actuating a secondary air pump ( 13 ) for delivering air to the burner ( 3 ).

5. The method according to claim 4 comprising the following steps before the actuation of the secondary air pump ( 13 ) for delivering air to the burner ( 3 ):
actuating the fuel metering device ( 10 ) for delivering fuel ( 11 ) to the burner ( 3 ),
actuating the ignition apparatus ( 12 ) of the burner ( 3 ).

6. The method according to claim 1 , wherein the actuation of the ignition apparatus ( 12 ) of the burner ( 3 ) comprises an actuation of the ignition apparatus ( 12 ) with an ignition apparatus actuation duration ( 303 ) starting at an ignition apparatus actuating start time (t 2 ), such that it ignites at the ignition time (t 0 ).

7. The method according to claim 6 , wherein a first actuation of the ignition apparatus ( 12 ) of the burner ( 3 ) is carried out with a longer ignition apparatus actuation duration ( 303 ) than a later second actuation of the ignition apparatus ( 12 ) of the burner ( 3 ), such that it ignites at the ignition time (t 0 ) and subsequently burns for the burning duration ( 304 ).

8. The method according to claim 1 , wherein a spark plug is used as the ignition apparatus ( 12 ).

9. A system comprising:
a computing unit configured to:
actuate a fuel metering device ( 10 ) to deliver fuel ( 11 ) to a burner ( 3 ) starting at a meter time (t 1 ), the burner ( 3 ) configured to introduce burning gases or burning exhaust gas into an exhaust system downstream of an engine ( 1 ) and upstream of a catalytic converter ( 4 ),
actuate an ignition apparatus ( 12 ) of the burner ( 3 ) such that it ignites at an ignition time (t 0 ) and subsequently burns for a burning duration ( 304 ), and
determine the meter time (t 1 ) and/or the ignition time (t 0 ), such that fuel delivered to the burner ( 3 ) at the meter time (t 1 ) is not deposited in the burner prior to the ignition time but reaches the ignition apparatus at ignition time (t 0 ) or during the burning duration ( 304 ),
wherein the ignition apparatus is a spark plug and
wherein the burning duration is a time during which an energy of an ignition coil of the spark plug discharges to a secondary side of the spark plug.

10. The system of claim 9 , further comprising the burner ( 3 ).

11. A non-transitory computer-readable medium including instructions executable by an electronic processor to perform a set of functions, the set of functions comprising:
actuating a fuel metering device ( 10 ) to deliver fuel ( 11 ) to the burner ( 3 ) starting at a meter time (t 1 ),
actuating an ignition apparatus ( 12 ) of the burner ( 3 ) such that it ignites at an ignition time (t 0 ) and subsequently burns for a burning duration ( 304 ), and
determining the meter time (t 1 ) and/or the ignition time (t 0 ), such that fuel delivered to the burner ( 3 ) at the meter time (t 1 ) is not deposited in the burner prior to the ignition time but reaches the ignition apparatus at ignition time (t 0 ) or during the burning duration ( 304 ),
wherein the ignition apparatus is a spark plug and
wherein the burning duration is a time during which an energy of an ignition coil of the spark plug discharges to a secondary side of the spark plug.

Assignees

• Bosch Gmbh Robert

Inventors

• Zhang Chao
• Uhlenbrock Dietmar
• Schiele Erwin
• Langer Winfried
• Deissler Markus
• Nau Michael

Classifications

• F01N3/2033 Primary

  using a fuel burner or introducing fuel into exhaust duct · CPC title

• F01N2240/14

  a fuel burner · CPC title

• F01N9/00

  Electrical control of exhaust gas treating apparatus (monitoring or diagnostic devices for exhaust-gas treatment apparatus F01N11/00; conjoint electrical control of two or more combustion engine functions F02D43/00) · CPC title

• F01N3/36

  Arrangements for supply of additional fuel · CPC title

• F01N2900/0422

  measuring the elapsed time · CPC title