# US 2017/0284265 A1 · Scr device

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- Number: US 2017/0284265 A1
- Document ID: US20170284265A1
- Status: Published application
- Kind: A1
- Application number: 15/091,001
- Filed: 2016-04-05
- Published: 2017-10-05
- Earliest claimed: 2016-04-05
- Assignees: Ford Global Technologies, LLC
- Applicants: Ford Global Technologies, LLC
- Inventors: Xiaogang Zhang
- Web page: https://patentgrep.com/patent/US20170284265A1

## CPC

- F01N 3/2892: {Exhaust flow directors or the like, e.g. upstream of catalytic device}
- F01N 3/2066: {Selective catalytic reduction [SCR]}
- F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent}
- F01N 3/2835: {fibrous}
- F01N 2290/04: driven by exhaust gases
- F01N 2610/02: the substance being ammonia or urea
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Methods and systems are provided for an SCR device configured to store an amount of urea. In one example, a system may include rotating a plurality of plates in the SCR as exhaust gas flows through the SCR.

## Claims

### Claim 1

A system comprising:
a hollow cylindrical selective catalytic reduction device located along an exhaust passage comprising a plurality of plates configured to rotate via a rotatable rod as exhaust gas flows through of the device; and
a passage configured to flow urea into the device, where the urea pools in a lower portion of the device.

### Claim 2 (depends on 1)

The system of claim 1, wherein the exhaust passage comprises an exhaust pipe physically coupled to the device further comprising an inlet and an outlet, and where the inlet is vertically higher than the outlet.

### Claim 3 (depends on 1)

The system of claim 1, wherein the device comprises a curved surfaced located between identical circular surfaces, and where the curved surface is divided into an upper arc and a lower arc.

### Claim 4 (depends on 3)

The system of claim 3, further comprising an angle measured from the center of the device to outer edges of the upper arc being greater than a largest angle measured between two adjacent plates.

### Claim 5 (depends on 1)

The system of claim 1, wherein the plates divide an interior of the device compartments, where exhaust gas in a first compartment is able to flow through one or more plates into a second, different compartment.

### Claim 6 (depends on 1)

The system of claim 1, wherein the plates are positioned to rotate through the pooled urea.

### Claim 7 (depends on 1)

The system of claim 1, wherein the plates are impervious to exhaust gas flow.

### Claim 8 (depends on 1)

The system of claim 1, wherein the device comprises four plates, and where an angle between the plates is equal to 90°.

### Claim 9 (depends on 1)

The system of claim 1, wherein the plates are comprised of one or more catalyst, porous fiber material, and wire mesh.

### Claim 10

A method comprising:
rotating a plurality of plates in an SCR device as exhaust gas flows into the SCR device; and
adjusting an amount of urea delivered to the SCR device based on a rotational speed of the plates.

### Claim 11 (depends on 10)

The method of claim 10, wherein the urea being delivered to the SCR device is terminated in response to the rotational speed of the plates being less than the threshold speed.

### Claim 12 (depends on 10)

The method of claim 10, wherein the threshold speed is based on one or more of an engine load, exhaust mass flow rate, EGR flow rate, fuel injection pressure, and spark timing.

### Claim 13

An exhaust system comprising:
an exhaust pipe;
an SCR device comprising a hollow cylindrical body with first and second circular surfaces opposite one another with a curved surface located therebetween, and where the exhaust pipe is physically coupled to the curved surface via an inlet and an outlet at axially different heights;
a plurality of plates located inside the SCR device physically coupled to a rotatable rod located along a rotational axis aligned with a center of the first and second surfaces; and
a passage configured to flow urea to the SCR device, where the urea pools in a lower portion below a central axis of the SCR device.

### Claim 14 (depends on 13)

The exhaust system of claim 13, wherein the inlet is axially above the outlet.

### Claim 15 (depends on 13)

The exhaust system of claim 13, wherein the plurality of plates comprises four square porous plates, and where an angle between each of the plates is equal to 90°.

### Claim 16 (depends on 13)

The exhaust system of claim 13, wherein the plates divide an interior of the SCR device into compartments, and where exhaust gas flows through at least two compartments before exiting the SCR device.

### Claim 17 (depends on 13)

The exhaust system of claim 13, wherein the pooled urea is exposed to exhaust gas flow flowing through the SCR device.

### Claim 18 (depends on 13)

The exhaust system of claim 13, wherein the curved surface comprises an upper arc and a lower arc located between the inlet and outlet on the curved surface, and where the lower arc is longer than the upper arc.

### Claim 19 (depends on 18)

The exhaust system of claim 18, wherein the upper arc comprises an angle smaller than an angle of the lower arc, and where both angles are greater than an angle between the plates, and where one or the plates is engaged with the upper arc independent of a rotational position of the plates.

### Claim 20 (depends on 13)

The exhaust system of claim 13, wherein the plates are mechanically rotated via exhaust gas flow.