# US 9,435,241 B2 · Exhaust gas purification apparatus for internal combustion engine

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- Number: US 9,435,241 B2
- Document ID: US9435241B2
- Status: Granted
- Kind: B2
- Application number: 14/008,258
- Filed: 2011-03-28
- Published: 2014-01-16
- Granted: 2016-09-06
- Earliest claimed: 2011-03-28
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Takanori Nakano
- Inventors: Takanori Nakano
- Web page: https://patentgrep.com/patent/US9435241B2

## CPC

- F01N 3/2066: {Selective catalytic reduction [SCR]}
- B01F 25/314: wherein additional components are introduced at the circumference of the conduit
- F01N 3/105: {General auxiliary catalysts, e.g. upstream or downstream of the main catalyst}
- F01N 3/2033: {using a fuel burner or introducing fuel into exhaust duct}
- F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device}
- F01N 3/36: Arrangements for supply of additional fuel
- F01N 3/38: Arrangements for igniting
- B01F 2025/931: {Flow guiding elements surrounding feed openings, e.g. jet nozzles}
- F01N 2240/14: a fuel burner
- F01N 2240/20: a flow director or deflector
- F01N 2250/02: filtering and catalytic conversion
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/03: the substance being hydrocarbons, e.g. engine fuel
- F01N 2610/1453: Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
- Y02T 10/12: Improving ICE efficiencies
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- B01F: MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING (mixing paints B44D3/06)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An object of the invention is to satisfactorily remove solid materials derived from reducing agent and depositing on a wall of an exhaust passage in an exhaust gas purification apparatus for an internal combustion engine equipped with a selective reduction catalyst provided in the exhaust passage of the internal combustion engine and a reducing agent supply apparatus that supplies reducing agent derived from ammonia into the exhaust passage upstream of the selective reduction catalyst. To achieve the object, according to the invention, a fuel supply apparatus that supplies fuel into the exhaust passage upstream of the reducing agent supply apparatus and an ignition apparatus that ignites fuel supplied by the fuel supply apparatus to generate flame are provided. Solid materials derived from the reducing agent are removed by the flame generated by the fuel supply apparatus and the ignition apparatus.

## Claims

### Claim 1

An exhaust gas purification apparatus for an internal combustion engine comprising:
a selective reduction catalyst disposed in an exhaust passage of the internal combustion engine;
a reducing agent supply apparatus that supplies reducing agent derived from ammonia into the exhaust passage upstream of said selective reduction catalyst;
a fuel supply apparatus that supplies fuel into the exhaust passage upstream of said selective reduction catalyst; and
an ignition apparatus that ignites fuel supplied by said fuel supply apparatus to generate flame,
wherein said reducing agent supply apparatus, said fuel supply apparatus, and said ignition apparatus are arranged in such a way that said flame reaches a striking site on the wall of the exhaust passage on which the reducing agent supplied by said reducing agent supply apparatus strikes.

### Claim 2 (depends on 1)

An exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein said reducing agent supply apparatus, said fuel supply apparatus, and said ignition apparatus are arranged in such a way that said flame reaches said striking site but does not reach said reducing agent supply apparatus.

### Claim 3 (depends on 1)

An exhaust gas purification apparatus for an internal combustion engine according to claim 1, further comprising:
a precatalyst disposed in the exhaust passage downstream of said fuel supply apparatus and said ignition apparatus and upstream of said reducing agent supply apparatus, and having an outer diameter smaller than said exhaust passage; and
a guide plate that guides flame generated by said fuel supply apparatus and said ignition apparatus to said precatalyst and said striking site.