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US 10,519,829 B2Granted
Exhaust purification system
AssigneeHino Motors, Ltd.
InventorsShinya Sato, Mitsuru Hosoya, Takashi Takakura
Life of this patent
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AssigneeHino Motors, Ltd.
InventorsShinya Sato, Mitsuru Hosoya, Takashi Takakura
Estimating the term…
An exhaust purification system includes an exhaust passage. Exhaust gas flows through the exhaust passage. A burner is arranged in the exhaust passage. A combustion space for fuel in the burner is a part inside the exhaust passage. A NOx adsorbent is located downstream of the combustion space in the exhaust passage. The NOx adsorbent adsorbs nitrogen oxide contained in the exhaust gas. A selective reduction catalyst is located downstream of the NOx adsorbent in the exhaust passage. An adding valve is located between the selective reduction catalyst and the combustion space in the exhaust passage. A connection passage is connected to the adding valve. Urea water flows through the connection passage toward the adding valve. A part of the connection passage runs through the combustion space.
An exhaust purification system comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Characterised by the absorbed or adsorbed substances: nitrogen oxides
Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping: liquid distribution
For cooling, or for removing solid constituents of, exhaust: by means of filters
By using absorbents or adsorbents: combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
About 9 years 4 months of term left · ends 22 Feb 2036 (estimated)
The present invention relates to an exhaust purification system including a selective reduction catalyst.
A known exhaust purification system that reduces nitrogen oxide (hereinafter referred to as “NOx”) contained in exhaust, such as that described in patent document 1, includes a urea selective catalytic reduction (SCR) system using a urea water adding device and a selective reduction catalyst. In the urea SCR system, exhaust gas to which urea water has been added by the urea water adding device flows into the selective reduction catalyst, and the urea water is converted into ammonia through hydrolysis. In the selective reduction catalyst, NOx is reduced by the ammonia and converted into nitrogen and water.
Patent Document 1: Japanese Laid-Open Patent Publication No. 2013-11193
FIG. 1 illustrates the schematic structure of an exhaust purification system according to a first embodiment.
FIG. 2 illustrates the schematic configuration of a control device.
FIG. 3 is a flowchart illustrating one example of a process for adding urea water.
An exhaust purification system according to one embodiment will now be described with reference to FIGS. 1 to 6.
[First Embodiment]
Referring to FIG. 1, an exhaust purification system 1 is supplied with exhaust gas from an engine 2 and purifies and emits the supplied exhaust gas. The exhaust purification system 1 has a double-tube structure including an inner tube 3 and an outer tube 4, which is arranged outside the inner tube 3. The outer tube 4 has a tube structure including a bottom. The inner tube 3 has two ends. In the two ends of the inner tube 3, a distal end is an end opposite to an end closer to the engine 2. The distal end of the inner tube 3 is inserted into the outer tube 4 and separated from a bottom surface 5 of the outer tube 4. This allows the inner space of the inner tube 3 to communicate with an outer space between the outer surface of the inner tube 3 and the inner surface of the outer tube 4. The entirety of the inner tube 3 and the outer tube 4 constitutes an exhaust passage 10.