Catalytic converter of vehicle

Patent metadata

Field	Value
Publication number	US-12276221-B2
Application number	US-202217977479-A
Country	US
Kind code	B2
Filing date	Oct 31, 2022
Priority date	Jul 27, 2022
Publication date	Apr 15, 2025
Grant date	Apr 15, 2025

Abstract

The catalytic converter of the vehicle includes: an LNT converter including an LNT catalyst to reduce nitrogen oxides; an SDPF converter including an SDPF catalyst to capture particulate matters and reduce the nitrogen oxides; a connection housing connecting the LNT converter and the SDPF converter to each other; an injection module provided in the connection housing to inject the reducing agent from the LNT converter toward the SDPF converter; an impactor atomizing and vaporizing the reducing agent injected from the injection module; a first guide mixer provided inside the connection housing to form a swirl-direction flow of the exhaust gas mixed with the reducing agent atomized through the impactor; and a second guide mixer provided downstream of the first guide mixer inside the connection housing to form an additional swirl-direction flow of the exhaust gas mixed with the reducing agent.

First claim

What is claimed is:

1. A catalytic converter apparatus of a vehicle, the catalytic converter apparatus comprising:
a lean NOx trap (LNT) converter including an LNT catalyst to reduce nitrogen oxides contained in exhaust gas of the vehicle;
an SDPF converter including an SDPF catalyst to capture particulate matters contained in the exhaust gas and reduce the nitrogen oxides contained in the exhaust gas using a reducing agent;
a connection housing connecting the LNT converter and the SDPF converter to each other;
an injection module provided in the connection housing to inject the reducing agent from the LNT converter toward the SDPF converter;
an impactor provided inside the connection housing to atomize and vaporize the reducing agent injected from the injection module;
a first guide mixer provided inside the connection housing to form a swirl-direction flow of the exhaust gas mixed with the reducing agent atomized through the impactor; and
a second guide mixer provided downstream of the first guide mixer inside the connection housing to form an additional swirl-direction flow of the exhaust gas mixed with the reducing agent,
wherein the injection module is mounted on the connection housing to inject the reducing agent in three directions toward the SDPF converter from the LNT converter,
wherein the impactor includes:
a first impactor disposed downstream of the first guide mixer to atomize and vaporize the reducing agent injected in two directions from the injection module among the three directions; and
a second impactor disposed downstream of the first impactor to atomize and vaporize the reducing agent injected in one direction from the injection module among the three directions, and

wherein the first impactor includes:
a first fixing portion fixed to a lower surface of the connection housing above the LNT converter;
a first left wall formed from the first fixing portion so that the reducing agent injected in one direction from the injection module collides therewith; and
a first right wall formed from the first fixing portion so that the reducing agent injected in another direction from the injection module collides therewith.

2. The catalytic converter apparatus of claim 1 , wherein the exhaust gas introduced into the SDPF converter from the connection housing flows from a right side to a left side inside the SDPF converter so that the exhaust gas inside the LNT converter flows in an opposite direction to the exhaust gas inside the SDPF converter.

3. The catalytic converter apparatus of claim 1 , wherein the first guide mixer includes:
a first guide body portion extending in a direction from the SDPF converter toward the LNT converter;
a first guide left extension portion extending along a first-side internal circumference of an upper portion of the LNT converter from a first end portion of the first guide body portion; and
a first guide right extension portion extending along a second-side internal circumference of the upper portion of the LNT converter from a second end portion of the first guide body portion.

4. The catalytic converter apparatus of claim 3 , wherein the first guide body portion is concavely formed downward from the upper portion of the LNT converter.

5. The catalytic converter apparatus of claim 3 , wherein the first guide left extension portion and the first guide right extension portion are concavely formed to cover an edge portion of the LNT catalyst of the LNT converter.

6. The catalytic converter apparatus of claim 3 , wherein a distance between an upper surface of the LNT catalyst of the LNT converter and a lowermost end portion of the first guide mixer is 50% or more than 50% of a diameter of the LNT catalyst of the LNT converter.

7. The catalytic converter apparatus of claim 1 , wherein the second impactor includes a second central wall with which the reducing agent injected in another direction from the injection module collides.

8. The catalytic converter apparatus of claim 7 , wherein a pair of second central bent portions bent left and right from the second central wall, respectively, are formed from the second central wall.

9. The catalytic converter apparatus of claim 8 , wherein each of the second central bent portions has a protrusion, and the protrusion is inserted into a slot formed in the first guide mixer.

10. The catalytic converter apparatus of claim 1 , wherein the second guide mixer is formed to extend by a set length along a circumference of the SDPF converter between the SDPF converter and the connection housing.

11. The catalytic converter apparatus of claim 10 , wherein the second guide mixer includes a second guide body portion mounted on a connection body, and a second guide extension portion formed along a circumferential direction of the SDPF converter from the second guide body portion.

12. The catalytic converter apparatus of claim 11 , wherein the second guide extension portion is formed to have a length of 25% or more than 25% of a diameter of the SDPF converter.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Faurecia Korea Ltd

Inventors

• Lee Sangmin
• Na Inkyun
• Jeong Gyuhwa
• Lee Dongjun

Classifications

• F01N3/0821

  combined with particulate filter · CPC title

• F01N2330/38

  flow channels with means to enhance flow mixing,(e.g. protrusions or projections) · CPC title

• F01N3/206

  Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents · CPC title

• F01N2610/146

  Control thereof, e.g. control of injectors or injection valves · CPC title

• F01N2900/1812

  Flow rate · CPC title