# US 2014/0154814 A1 · Urea solution quality determining system

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- Number: US 2014/0154814 A1
- Document ID: US20140154814A1
- Status: Published application
- Kind: A1
- Application number: 13/974,463
- Filed: 2013-08-23
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Sung-Hoon BANG
- Web page: https://patentgrep.com/patent/US20140154814A1

## CPC

- G01N 31/10: using catalysis
- C22C 35/00: Master alloys for iron or steel
- F01N 3/208: {Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent}
- G01N 33/0037: {NOx}
- F01N 2560/026: for measuring or detecting NOx
- F01N 2560/14: having more than one sensor of one kind
- F01N 2610/02: the substance being ammonia or urea
- F01N 2610/14: Arrangements for the supply of substances, e.g. conduits
- F01N 2610/142: Controlling the filling of the tank
- F01N 2610/148: Arrangement of sensors
- F01N 2900/0416: using the state of a sensor, e.g. of an exhaust gas sensor
- F01N 2900/1402: Exhaust gas composition
- F01N 2900/1814: Tank level
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02T 10/12: Improving ICE efficiencies
- Y02T 10/40: Engine management systems
- Y10T 436/12: Condition responsive control
- Y10T 436/17: Nitrogen containing
- Y10T 436/171538: Urea or blood urea nitrogen
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- 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)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A urea solution quality determining system may include a urea tank in which a urea solution is filled through a charging hole, a test chamber positioned below the charging hole for holding a portion of the urea solution, a main line connected to the urea tank at a lower part of the urea tank below the test chamber, a test line connected to the test chamber, a pumping line to which the main line and the test line are joined, a pump in the pumping line to pump the urea solution from the test chamber or from the urea tank, a control valve for selectively connecting the main line or the test line to the pumping line, and an injector at an end of the pumping line to inject the urea solution into an exhaust line through which an exhaust gas flows. A method is also described.

## Claims

### Claim 1

A urea solution quality determining system, comprising:
a urea tank in which a urea solution is filled through an charging hole;
a test chamber that is positioned below the charging hole for holding a portion of the urea solution;
a main line connected to the urea tank at a lower part of the urea tank below the test chamber;
a test line connected to the test chamber;
a pumping line into which the main line and the test line are joined;
a pump installed in the pumping line to pump the urea solution from the test chamber or from the urea tank;
a control valve for selectively connecting the main line or the test line to the pumping line; and
an injector disposed at an end of the pumping line to inject the urea solution into an exhaust line through which an exhaust gas flows.

### Claim 2 (depends on 1)

The urea solution quality determining system of claim 1, wherein the control valve is a switch valve installed at a point where the main line and the test line are joined.

### Claim 3 (depends on 1)

The urea solution quality determining system of claim 1, wherein a selective catalyst reduction unit is disposed in the exhaust line on a downstream side of the injector.

### Claim 4 (depends on 3)

The urea solution quality determining system of claim 3, wherein NOx sensors are disposed on an upstream side and a downstream side of the selective catalyst reduction unit, respectively.

### Claim 5 (depends on 1)

The urea solution quality determining system of claim 1, wherein a level sensor for sensing a level of the urea solution filled in the urea tank is disposed in the urea tank.

### Claim 6

A urea solution quality determining method, comprising:
sensing an increase in a urea solution put in a urea tank;
determining whether an exhaust amount of a nitrogen oxide included in an exhaust gas is stable;
determining whether the urea solution is supplied based on the sensed increase in the urea solution;
pumping the urea solution from a test chamber formed below an charging hole of the urea tank to an injector if it is determined that the urea solution is supplied and the exhaust amount of the nitrogen oxide is stable;
sensing a reduction rate of a selective catalyst reduction unit while the urea solution is injected from the test chamber; and
generating a warning signal if the determined reduction rate of the selective catalyst reduction unit is less than or equal to a set value.

### Claim 7 (depends on 6)

The urea solution quality determining method of claim 6, wherein
a test line is connected to the test chamber;
a main line is connected to a lower part of the urea tank;
a pumping line into which the main line and the test line are joined is connected to the injector;
a pump is installed in the pumping line; and
a switch valve is installed at a point where the test line and the main line are joined.

### Claim 8 (depends on 6)

The urea solution quality determining method of claim 6, wherein a warning lamp is lighted in accordance with the warning signal or an output of an engine is forcibly reduced.

### Claim 9 (depends on 6)

The urea solution quality determining method of claim 6, further comprising:
pumping the urea solution from the urea tank to the injector if the determined reduction rate of the selective catalyst reduction unit exceeds the set value.