EXHAUST PURIFICATION SYSTEM OF AN INTERNAL COMBUSTION ENGINE

• US 20190316505A1
• Filed: 02/11/2019
• Published: 10/17/2019
• Est. Priority Date: 04/11/2018
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: NOTAKE, Yasumasa, NISHIOKA, Hiromasa, TAKADA, Keishi, SAKUMA, Tetsuya, FUJIHARA, Kiyoshi
• Granted Patent: US 10,641,150 B2
• Time in Patent Office: Days
• CPC Class Codes: C01B 2203/0227 containing a catalytic reforming step
• CPC Class Codes: C01B 2203/0261 containing a catalytic partial oxidation step [CPO]
• CPC Class Codes: C01B 2203/0822 the fuel containing hydrogen
• CPC Class Codes: C01B 2203/0883 by indirect heat exchange
• CPC Class Codes: C01B 3/382 Multi-step processes
• CPC Class Codes: C01B 3/386 Catalytic partial combustion
• CPC Class Codes: F01N 2240/02 a heat exchanger
• CPC Class Codes: F01N 2240/14 a fuel burner
• CPC Class Codes: F01N 2240/20 a flow director or deflector
• CPC Class Codes: F01N 2240/30 a fuel reformer
• CPC Class Codes: F01N 2470/12 Tubes being corrugated
• CPC Class Codes: F01N 2610/03 the substance being hydrocarbons, e.g. engine fuel
• CPC Class Codes: F01N 2610/04 the substance being hydrogen
• CPC Class Codes: F01N 2610/08 with prior mixing of the substances with a gas, e.g. air
• CPC Class Codes: F01N 2610/10 the substance being heated, e.g. by heating tank or supply line of the added substance
• CPC Class Codes: F01N 2610/1453 Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
• CPC Class Codes: F01N 3/2033 using a fuel burner or introducing fuel into exhaust duct
• CPC Class Codes: F01N 3/206 Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents F01N3/2066 takes precedence
• CPC Class Codes: F01N 3/2892 Exhaust flow directors or the like, e.g. upstream of catalytic device
• CPC Class Codes: F01N 3/30 Arrangements for supply of additional air control, e.g. using by-passes or variable air pump drives, F01N3/22
• CPC Class Codes: F01N 3/36 : Arrangements for supply of additional fuel
• CPC Class Codes: Y02T 10/12 : Improving ICE efficiencies

Abstract

An exhaust treatment catalyst (5) is arranged in the engine exhaust passage, and hydrogen generated in the reformer (6) is supplied through the hydrogen supply pipe (13) to the inside of the engine exhaust passage upstream of the exhaust treatment catalyst (5). Heat exchange fins (15) for heat exchange with exhaust gas flowing through the inside of the engine exhaust passage are formed on the outer circumferential surface of the hydrogen supply pipe (13) inserted inside the engine exhaust passage.

Claims

1. An exhaust purification system of an internal combustion engine comprising:

a reformer,

an exhaust treatment catalyst arranged in an engine exhaust passage,

a hydrogen supply pipe inserted inside the engine exhaust passage upstream of the exhaust treatment catalyst, hydrogen generated in the reformer being supplied to the engine exhaust passage upstream of the exhaust treatment catalyst via the hydrogen supply pipe, and

heat exchange fins formed on an outer circumferential surface of the hydrogen supply pipe for heat exchange with exhaust gas flowing through an inside of the engine exhaust passage.

2. The exhaust purification system of an internal combustion engine according to claim 1, wherein heat exchange fins for heat exchange with reformed gas containing hydrogen and flowing through the inside of the hydrogen supply pipe are further formed on an inner circumferential surface of the hydrogen supply pipe.

3. The exhaust purification system of an internal combustion engine according to claim 1, wherein a swirl flow generator imparting a swirl flow about an axis of the hydrogen supply pipe to reformed gas containing hydrogen flowing through the inside of the hydrogen supply pipe is arranged inside of the hydrogen supply pipe.

4. The exhaust purification system of an internal combustion engine according to claim 1, wherein a front end part of the hydrogen supply pipe extends from outside of an exhaust pipe through a wall of the exhaust pipe to the inside of the exhaust pipe and is bent in an axial direction of the exhaust pipe so that an opening part of the front end of the hydrogen supply pipe faces an upstream side end face of the exhaust treatment catalyst.