KR20160115364A - Device and method for checking urea of SCR system - Google Patents
Device and method for checking urea of SCR system Download PDFInfo
- Publication number
- KR20160115364A KR20160115364A KR1020150042906A KR20150042906A KR20160115364A KR 20160115364 A KR20160115364 A KR 20160115364A KR 1020150042906 A KR1020150042906 A KR 1020150042906A KR 20150042906 A KR20150042906 A KR 20150042906A KR 20160115364 A KR20160115364 A KR 20160115364A
- Authority
- KR
- South Korea
- Prior art keywords
- urea
- fuel pump
- urea water
- engine
- fuel
- Prior art date
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000004202 carbamide Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000446 fuel Substances 0.000 claims abstract description 90
- 230000002950 deficient Effects 0.000 claims abstract description 17
- 239000002828 fuel tank Substances 0.000 claims abstract description 3
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 claims description 61
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 20
- 239000003054 catalyst Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 230000000007 visual effect Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Toxicology (AREA)
- Transportation (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust Gas After Treatment (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
Description
The present invention relates to a warning device and method for checking the number of components of an SCR system, and more particularly, to a method and an apparatus for checking the number of components of an SCR system by limiting the output of the engine using SCR- To an alarm device and method for checking the number of elements of an SCR system so that an operator warning can be made.
Considering the fact that the exhaust gas discharged from the diesel engine contains nitrogen oxide (hereinafter referred to as NOx) which causes serious air pollution, a catalytic reduction method for removing NOx is used.
To this end, a Diesel Particulate Filter (DOC) or a Diesel Particulate Filter (DOC), which is a kind of exhaust gas post-treatment device for physically collecting and burning PM (particulate matter) A selective catalytic reduction (SCR) catalyst is continuously installed to remove the catalyst effectively.
In the SCR system, which is a kind of exhaust gas post-treatment apparatus using the SCR catalyst, the urea injected into the exhaust pipe is pyrolyzed by the heat in the exhaust pipe or contacted with the SCR catalyst and is decomposed to decompose one molecule element into ammonia of two molecules, Ammonia is used for selective catalytic reduction (SCR) reaction with nitrogen oxides (NOx) in the exhaust gas, thereby releasing harmless nitrogen and water, which are the products of the reaction, to the outside.
More specifically, the SCR system is a system capable of effectively reducing NOx by injecting urea water (UREA), which is a kind of reducing agent, into an SCR catalyst. As shown in FIG. 1, the number of urea in the
The SCR system is a useful system for reducing NOx in the exhaust gas in response to the strengthening of the diesel emission regulations, but when the urea water in the urea water tank is depleted or the number of defective urea water is filled, the SCR system does not function, Nox in the gas can not be sufficiently removed and discharged into the atmosphere, which can lead to environmental pollution and dissatisfaction with laws.
On the other hand, the related regulations include regulations that make it impossible to drive the vehicle when there is a problem in the vehicle itself due to lack of urea or diagnosis of badness. In order to satisfy such regulations, The SCR element number warning system is applied to measure the number of urea elements and the components by applying a water sensor, and to determine whether the number of elements is exhausted or not based on the measured data.
However, most vehicles applying conventional SCR factor number warning systems rely heavily on visual warnings.
That is, as the number of elements in the urea water tank becomes depleted, only visual warnings (for example, white → yellow → red) are made through the cluster.
This visual warning through the cluster is highly likely to be ignored by the driver and is also only visually warranted. If the number of elements is exhausted or the number of bad elements is detected, For example, during driving, the driver must feel quite uncomfortable, and inevitably will have a great dissatisfaction with the SCR factor warning system.
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a fuel pump control system, The present invention also provides an alarm device and method for checking the number of elements of an SCR system in which an element number warning to a driver can be sequentially and clearly performed by limiting the output of the engine in stages.
According to an aspect of the present invention, there is provided an apparatus for detecting an urea water, comprising: a urea water sensor for detecting that the urea water in the urea water tank is depleted or filled with a defective urea water; An engine ECU for controlling a fuel supply required amount for the engine; A fuel pump controller for controlling a fuel pump pressure based on a urea water sensing signal of the urea water sensing sensor and a fuel supply required amount signal of the engine ECU; A fuel pump for varying the fuel pressure from the fuel tank to the engine in accordance with the fuel pump pressure control signal of the fuel pump controller; And a warning unit for checking the number of elements of the SCR system.
Preferably, in the warning device of the present invention, the fuel pump controller determines whether the number of elements and the number of elements are defective based on the elliptic element sensing signal, and outputs a warning lamp and a warning message when the number of elements is less than or equal to the specified amount Cluster. ≪ / RTI >
According to another aspect of the present invention, there is provided a method of detecting a residual amount of urea in a urea water tank, Ii) if the number of urea is less than or equal to the specified amount, controlling the fuel pump pressure downward to limit the engine output stepwise; And a warning method for checking the number of elements of the SCR system.
Preferably, in the step (ii), the fuel pump pressure is controlled so as to be lowered to a level at which the engine maximum output is limited at a moment when the urea water falls below a specified amount.
Further, in the step (ii), if the urea water is continuously reduced after the fuel quantity falls below a predetermined amount, the fuel pump pressure is controlled to be lowered in proportion to the level at which the engine output gradually decreases from the maximum output.
When the number of urea is depleted or it is determined to be defective in the step (ii), the fuel pump pressure is controlled to be downwardly controlled so that the engine output becomes a minimum output level required for traveling.
Preferably, the warning method of the present invention further comprises a step of outputting a warning light and a warning message through the cluster when the number of elements is less than or equal to the specified amount.
Through the above-mentioned means for solving the problems, the present invention provides the following effects.
First, when the number of urea is exhausted or filled with a defective urea water, the engine output is stepwise restricted by using the fuel pump control, leaving the step of immediately stopping the vehicle running, so that the urea number warning to the driver is sequentially Can be clearly made, and can lead to re-entrant element count.
Secondly, by limiting the engine output step by step, it is possible to secure the driving distance to the position for the re-insertion of the element number, so that the driver can smoothly carry out re-insertion of the element number.
1 is a schematic diagram showing the configuration of an SCR system,
2 is a diagram showing a warning device for checking the number of elements of an SCR system according to the present invention;
3 is a flowchart showing a warning method for checking the number of elements of the SCR system according to the present invention,
4 is a graph showing the operation principle of the warning method for checking the number of elements of the SCR system according to the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
2 showing a warning device for checking the number of elements of an SCR system according to the present invention, the SCR system comprises a
Here, the urea
At this time, the reason why the urea water sensing signal of the urea
The engine ECU 12 is connected to the
At this time, the reason why the fuel supply amount required by the engine ECU 12 is transmitted to the
Therefore, the
That is, the fuel pressure (pumping pressure) of the
On the other hand, a
Hereinafter, a warning method for checking the number of elements of the SCR system based on the above configuration will be described in more detail.
FIG. 3 is a flowchart illustrating a warning method for checking the number of elements of an SCR system according to the present invention, and FIG. 4 is a graph illustrating an operation principle of a warning method for checking the number of elements of an SCR system according to the present invention.
The warning method for checking the number of elements of the SCR system according to the present invention detects whether the number of urea water in the urea water tank and the number of urea water are defective or not, There is a point in limiting the output step by step.
To this end, the present urea remaining amount information and urea number defect information are transmitted to the
Then, the
That is, when it is determined in the
Accordingly, the driver recognizes the visual warning of the cluster, and at the same time, he feels the inconvenience of the acceleration force when the vehicle is running due to the restriction of the maximum engine output, so that it becomes clear that the remaining number of urea is insufficient.
When the number of urea drops below a specified amount and then decreases continuously, the
When the number of urea drops below the specified amount and falls below the constant specified amount, the pressure of the fuel pump is down-regulated on the basis of the current fuel supply required amount received by the
Referring to FIG. 3 (b), when the number of ellipses is insufficient, the amount of fuel supplied to the engine from the fuel pump is limited to some extent to generate an engine output incapable region, So that the driver feels a drop in the engine output. As a result, the fuel supply restriction is gradually increased, so that the driver can not ignore the urea supplement warning.
On the other hand, when it is judged that the urea water is depleted in the
If the urea number is determined to be exhausted or is defective and the urea water re-injection induction step is executed, the urea water re-injection message is again outputted through the cluster, and the fuel supply operation duty of the fuel pump decreases with time do.
3 (c), the
In this way, when the urea depletion or urea deficiency is filled, the fuel supply amount injection duty of the fuel pump can be controlled to allow the vehicle to travel to the safety position for injecting urea water, so that the operator can smoothly carry out urea injection .
10: Element count sensor
12: Engine ECU
20: Fuel pump controller
22: Fuel pump
Claims (7)
An engine ECU for controlling a fuel supply required amount for the engine;
A fuel pump controller for controlling a fuel pump pressure based on a urea water sensing signal of the urea water sensing sensor and a fuel supply required amount signal of the engine ECU;
A fuel pump for down-converting the fuel pressure directed from the fuel tank to the engine in accordance with the fuel pump pressure control signal of the fuel pump controller;
And a warning device for checking the number of elements of the SCR system.
Further comprising a cluster for judging whether or not the number of urea units and the number of urea units are defective based on the urea water sensing signal in the fuel pump controller and outputting warning lamps and warning messages when the number of urea units is less than or equal to a specified amount, Warning device for checking the number of elements in the system.
Ii) if the urea number is less than or equal to the specified amount, controlling the fuel pump pressure downward to limit the engine output stepwise;
And a warning unit for checking the number of elements of the SCR system.
In the step ii)
And the fuel pump pressure is controlled to be lowered to a level at which the engine maximum output is limited when the number of urea drops below a specified amount.
In the step ii)
Wherein the fuel pump pressure is controlled to be downwardly proportional to the level at which the engine output is gradually lowered from the maximum output when the number of urea drops below a specified amount and then continues to decrease.
In the step ii)
And the fuel pump pressure is downwardly controlled so that the engine output is at a minimum power level required for running, when the number of elements is depleted or determined to be defective.
If the number of elements is equal to or less than a predetermined value, a warning message through the cluster is turned on;
If the number of elements is depleted or determined to be bad, outputting a number-of-elements re-injection message through the cluster;
Further comprising the steps of: detecting the number of elements of the SCR system;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150042906A KR20160115364A (en) | 2015-03-27 | 2015-03-27 | Device and method for checking urea of SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150042906A KR20160115364A (en) | 2015-03-27 | 2015-03-27 | Device and method for checking urea of SCR system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20160115364A true KR20160115364A (en) | 2016-10-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020150042906A KR20160115364A (en) | 2015-03-27 | 2015-03-27 | Device and method for checking urea of SCR system |
Country Status (1)
| Country | Link |
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| KR (1) | KR20160115364A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170123876A (en) * | 2016-04-29 | 2017-11-09 | 현대자동차주식회사 | Method and appratus of driver inducement for vehicle |
-
2015
- 2015-03-27 KR KR1020150042906A patent/KR20160115364A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170123876A (en) * | 2016-04-29 | 2017-11-09 | 현대자동차주식회사 | Method and appratus of driver inducement for vehicle |
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