KR20130058449A - System for control urea injection quantity of vehicle and method thereof - Google Patents

System for control urea injection quantity of vehicle and method thereof Download PDF

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KR20130058449A
KR20130058449A KR1020110124457A KR20110124457A KR20130058449A KR 20130058449 A KR20130058449 A KR 20130058449A KR 1020110124457 A KR1020110124457 A KR 1020110124457A KR 20110124457 A KR20110124457 A KR 20110124457A KR 20130058449 A KR20130058449 A KR 20130058449A
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ammonia
particulate filter
diesel particulate
reaction rate
nox
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KR1020110124457A
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Korean (ko)
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KR101316856B1 (en
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전대수
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현대자동차주식회사
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    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/18—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 methods of operation; Control
    • F01N3/20—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 methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • F01N2610/146—Control thereof, e.g. control of injectors or injection valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

PURPOSE: An apparatus and method for controlling the injection amount of urea solution in a vehicle are provided to apply the accumulation amount of ash increased by the increase of a driving distance in order to determine the injection amount of the urea solution, thereby precisely injecting the urea solution. CONSTITUTION: An apparatus for controlling the injection amount of urea solution in a vehicle includes a diesel particulate filter (10) integrated with a selective catalytic reduction catalyst, a dosing module (20), and a control part (18). The filter causes a reduction reaction between NOx in exhaust gas and ammonia from the urea solution in order to purify NOx, and collects particle matters (PM). The dosing module injects the urea solution to the front end of the filter. The control part calculates the effective volume decrease amount of the filter by the accumulation of ash, and the reaction rate of the ammonia. The control part controls the injection of the urea solution with determining a required amount for injecting the urea solution according to ammonia consumption in which the effective volume decrease amount is reflected. [Reference numerals] (1) Engine; (18) Control part; (30) Tank; (32) Pump; (AA) Driving distance; (BB) Fuel consumption; (CC) Emission gas

Description

차량의 요소수 분사량 제어장치 및 방법{SYSTEM FOR CONTROL UREA INJECTION QUANTITY OF VEHICLE AND METHOD THEREOF}BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

본 발명은 차량의 요소수 분사량 제어장치 및 방법에 관한 것으로, 보다 더 상세하게는 SCR일체형 디젤매연필터(SDPF)가 장착되는 디젤차량에서 주행거리 증가에 따라 SCR일체형 디젤매연필터(SDPF)에 증대되는 Ash의 퇴적량을 적용하여 요소수 분사량을 결정함으로 요소수 분사에 정밀도 향상을 제공할 수 있는 차량의 요소수 분사량 제어장치 및 방법에 관한 것이다.The present invention relates to an apparatus and a method for controlling the amount of urea injection of a vehicle, and more particularly, an increase in an SCR integrated diesel particulate filter (SDPF) as the driving distance increases in a diesel vehicle equipped with the SCR integrated diesel particulate filter (SDPF). The present invention relates to an apparatus and method for controlling urea water injection amount of a vehicle capable of providing an improved precision in urea water injection by applying an amount of ash deposited.

디젤 EURO-6의 규제에 대응하기 위하여 디젤 차량에는 엔진의 연소과정에서 생성된 NOx, CO, THC, PM(Particulate Matters) 등의 유해물질을 제거하기 위한 다양한 형태의 후처리장치가 장착된다.To cope with the regulation of diesel EURO-6, diesel vehicles are equipped with various types of post-treatment devices for removing harmful substances such as NOx, CO, THC, and PM (Particulate Matters) generated in the combustion process of the engine.

후처리장치는 엔진에 근접하게 배치되어 THC 및 CO를 산화시켜 정화하는 디젤산화촉매(Diesel Oxidation Catalyst ; DOC), 입자상 물질인 PM을 포집하는 디젤매연필터(Diesel Particulate Filter : DPF), 암모니아(NH3)와 환원작용을 통해 NOx를 정화하는 SCR(Selective Catalytic Reduction)촉매가 포함된다.The post-treatment device is a diesel oxidation catalyst (DOC) that is disposed close to the engine to oxidize and purify THC and CO, a diesel particulate filter (DPF) that collects PM, a particulate matter, and ammonia (NH3). And SCR (Selective Catalytic Reduction) catalyst to purify NOx through reduction.

상기의 SCR촉매는 NOx를 정화하기 위한 환원제로 암모니아(NH3)를 사용하며, NOx에 대한 선택도가 매우 우수하다.The SCR catalyst uses ammonia (NH3) as a reducing agent for purifying NOx, and has excellent selectivity for NOx.

SCR촉매는 NOx를 정화하기 위해 SCR촉매의 전단에 배치되는 도징모듈(Dosing Module)로 요소수(Urea)를 분사하고, 분사된 요소수의 증발 및 분해에 따라 생성되는 암모니아를 취득한다.The SCR catalyst injects urea water into a dosing module disposed upstream of the SCR catalyst to purify NOx, and obtains ammonia produced by evaporation and decomposition of the injected urea water.

도징모듈과 SCR촉매의 사이에 믹서가 배치되며, 도징모듈을 통해 분사되는 요소입자가 배기가스와 골고루 섞여 SCR촉매 입구단에서의 균일성(Uniformity)을 좋게 하여 배기가스내의 NOx와 분사된 요소수로부터 생성된 암모니아를 최적으로 혼합시켜 NOx의 정화효율을 향상시킨다.A mixer is disposed between the dosing module and the SCR catalyst, and the urea particles injected through the dosing module are evenly mixed with the exhaust gas to improve uniformity at the inlet end of the SCR catalyst, thereby improving the NOx and the number of injected urea in the exhaust gas. Optimum mixing of the ammonia generated from the mixture improves the NOx purification efficiency.

종래의 차량에 적용되어 있는 요소수 분사량 결정방법은 엔진에서 배출되는 NOx량과 암모니아의 비율인 양론비(NH3/NOx)에 따라 암모니아의 필요량을 산출하는 방식이 적용되고 있다.The method for determining the urea water injection amount applied to a conventional vehicle is a method of calculating the required amount of ammonia according to the stoichiometric ratio (NH 3 / NO x), which is a ratio of the amount of NO x emitted from the engine and the ammonia.

다른 방법으로는 SCR촉매상의 암모니아 저장량에서 암모니아 소모량을 차감하여 암모니아 필요량을 산출하는 방식이 적용되고 있다.Another method is to calculate the ammonia requirement by subtracting the ammonia consumption from the ammonia storage on the SCR catalyst.

그리고, 암모니아 필요량에 따른 요소수 분사량은 암모니아 양론비 당량과 암모니아 반응율로부터 암모니아 소비량이 계산되어 산출된다.The urea water injection amount according to the ammonia requirement is calculated by calculating the ammonia consumption from the ammonia stoichiometric ratio equivalent and the ammonia reaction rate.

암모니아 반응율은 촉매의 온도, 배기유속, NOx농도, 암모니아 누적 저장량, NO2/NOx비율 및 촉매의 에이징도가 적용되어 계산될 수 있다.The ammonia reaction rate can be calculated by applying the temperature of the catalyst, the exhaust velocity, the NOx concentration, the cumulative ammonia storage amount, the NO2 / NOx ratio and the aging degree of the catalyst.

상기와 같이 암모니아 필요양에 따라 요소수 분사량이 결정되면 요소탱크 내에 설치된 펌프의 작동에 의해 일정 압력, 대략 5bar정도의 압력이 걸리는 도징모듈의 인젝터를 작동시켜 산출된 양의 요소수를 분사한다.When the amount of urea water injection is determined according to the required amount of ammonia as described above, the urea water is injected by operating the injector of the dosing module that takes a predetermined pressure, about 5 bar, by the operation of the pump installed in the urea tank.

상기한 종래의 요소수 분사량 결정방법에서 전자의 방식은 느린 응답성과 암모니아 소비량 대비 낮은 성능 및 슬립량의 제어가 어려운 단점이 있다. In the conventional method of determining the urea water injection amount, the former method has a disadvantage in that it is difficult to control the slow response and the low performance and slip amount compared to the ammonia consumption.

그리고, 후자의 방식은 전자의 방식에 비하여 성능개선을 가져올 수 있으나, 촉매의 특성을 제대로 반영하지 못하는 경우 전자의 방식보다 상황을 악화시킬 수있다. In addition, the latter method may bring performance improvement compared to the former method, but may worsen the situation than the former method when the characteristics of the catalyst are not properly reflected.

또한, 기본적인 반응에 따른 NOx정화율에 근거한 제어가 이루어지고 있어, 보다 정밀한 제어가 이루어지지 못하여 배기 조건이 크게 변하는 경우에 효과적으로 대응하지 못할 수 있다.In addition, since the control based on the NOx purification rate according to the basic reaction is made, it may not be able to effectively cope with the case where the exhaust conditions change significantly because more precise control is not achieved.

최근들어 후처리장치에 대한 원가절감과 중량절감 및 효율적인 패키지를 제공하며, 강화되는 EURO-6의 규제에 대응하기 위해 디젤매연필터의 내부에 SCR촉매를 코팅 처리한 SCR일체형 디젤매연필터(SDPF)가 적용되고 있다.In recent years, SCR integrated diesel particulate filter (SDPF) coated SCR catalyst inside diesel particulate filter to provide cost reduction, weight reduction and efficient package for post-treatment equipment, and to cope with tougher EURO-6 regulations. Is being applied.

SCR일체형 디젤매연필터(SDPF)는 디젤매연필터와 SCR촉매가 독립적으로 구성되는 종래의 후처리장치와 비교하여 SCR 담체 및 캐닝이 삭제되어 중량을 저감시키고, 이에 따라 연비향상이 제공될 수 있다.SCR integrated diesel particulate filter (SDPF) is reduced compared to the conventional after-treatment apparatus that the diesel particulate filter and the SCR catalyst is configured to reduce the weight of the SCR carrier and canning, thereby improving fuel economy can be provided.

그리고, 배기관 상류측으로 이동시켜 장착이 가능하므로 배기가스 온도 상승에 의한 NOx 정화 성능 향상이 제공될 수 있다.Since the exhaust gas can be moved to the upstream side of the exhaust pipe, the NOx purifying performance can be improved by increasing the exhaust gas temperature.

그러나, SCR일체형 디젤매연필터(SDPF)는 첨부된 도 3에 도시된 바와 같이 차량의 주행거리가 증대할수록 Ash 퇴적량이 증대하여 SCR일체형 디젤매연필터(SDPF)의 유효체적을 감소시킨다.However, as the SCR integrated diesel particulate filter (SDPF) is shown in FIG. 3, the ash deposition amount increases as the driving distance of the vehicle increases, thereby reducing the effective volume of the SCR integrated diesel particulate filter (SDPF).

또한, 도 4에 도시된 바와 같이, 유효체적이 감소할수록 SV(Space Velocity)가 증대되어 암모니아의 반응율이 감소하고, 이에 따라 요소수 필요 분사량을 감소시키게 된다.In addition, as shown in FIG. 4, as the effective volume decreases, SV (Space Velocity) is increased to decrease the reaction rate of ammonia, thereby reducing the required amount of urea water.

따라서, SCR일체형 디젤매연필터(SDPF)에 일반적인 암모니아 반응율 모델을 적용할 경우 암모니아 분사량 계산의 정밀도가 저하되어 암모니아 슬립을 발생시키는 문제점이 있다. Therefore, when the general ammonia reaction rate model is applied to the SCR integrated diesel particulate filter (SDPF), the accuracy of ammonia injection amount calculation is deteriorated, thereby causing ammonia slip.

본 발명은 상기한 문제점을 해결하기 위한 것으로, 그 목적은 SCR일체형 디젤매연필터(SDPF)가 장착되는 디젤 차량에서 주행거리 증가에 따라 SCR일체형 디젤매연필터(SDPF)에 증대되는 Ash의 퇴적량을 적용하여 요소수 분사량을 결정함으로 요소수 분사에 정밀도 향상을 제공하고자 한다.The present invention is to solve the above problems, the object is to increase the amount of ash deposited in the SCR integrated diesel particulate filter (SDPF) in accordance with the increase in the mileage in a diesel vehicle equipped with the SCR integrated diesel particulate filter (SDPF). It is applied to determine the urea water injection amount to provide a precision improvement in urea water injection.

본 발명의 실시예에 따르는 특징은 엔진의 배출가스에 포함된 NOx와 요소수로부터 취득한 암모니아를 환원반응시켜 NOx를 정화하고, PM을 포집하는 SCR일체형 디젤매연필터; 상기 SCR일체형 디젤매연필터의 전단에 요소수를 분사하는 도징모듈을 포함하며, Ash의 퇴적에 따른 SCR일체형 디젤매연필터의 유효체적 감소분을 계산하고, SCR일체형 디젤매연필터의 암모니아 반응율을 계산하며, 암모니아 반응율에 유효체적 감소분을 반영하여 암모니아 소모량을 계산하고, 요소수 필요 분사량을 산출하여 도징모듈을 통해 요소수 분사를 제어하는 제어부를 포함하는 차량의 요소수 분사량 제어장치가 제공된다.According to an embodiment of the present invention, there is provided an SCR-integrated diesel particulate filter for purifying NOx by reducing a reaction between NOx contained in exhaust gas of an engine and ammonia obtained from urea water, and collecting PM; A dosing module for injecting urea water into the front end of the SCR integrated diesel particulate filter, calculating an effective volume reduction of the SCR integrated diesel particulate filter according to the deposition of Ash, calculating the ammonia reaction rate of the SCR integrated diesel particulate filter, There is provided a urea water injection amount control apparatus for a vehicle including a control unit for calculating ammonia consumption by reflecting an effective volume reduction in ammonia reaction rate, calculating a required amount of urea water and controlling urea water injection through a dosing module.

상기 제어부는 차량의 주행거리, 연료 소모량, SCR일체형 디젤매연필터의 재생 종료후 전후단의 차압을 적용하여 Ash 퇴적량을 산출하고, Ash 퇴적량에 따른 유효체적을 추출할 수 있다.The controller can calculate the Ash deposition amount by applying the driving distance of the vehicle, the fuel consumption amount, and the pressure difference between the front and rear ends of the SCR integrated diesel particulate filter after completion of regeneration, and extract the effective volume corresponding to the Ash deposition amount.

상기 제어부는 SCR일체형 디젤매연필터의 암모니아 반응율은 암모니아/NOx의 반응율과 암모니아/산소 반응율의 합으로 계산할 수 있다.The control unit may calculate the ammonia reaction rate of the SCR integrated diesel particulate filter by the sum of the reaction rate of ammonia / NOx and the ammonia / oxygen reaction rate.

상기 제어부는 SCR일체형 디젤매연필터의 유효체적, 온도, 배출가스의 유속, NOx 농도, 암모니아 누적저장량, NO2/NOx 비율, 에이징도를 적용하여 암모니아/NOx의 반응율을 계산할 수 있다.The control unit may calculate the reaction rate of ammonia / NOx by applying the effective volume, temperature, exhaust gas flow rate, NOx concentration, ammonia accumulation amount, NO2 / NOx ratio, and aging degree of the SCR integrated diesel particulate filter.

상기 제어부는 SCR일체형 디젤매연필터의 유효체적과 온도, 배출가스의 유속, 암모니아 누적저장량, NO2/NOx 비율, 에이징도를 적용하여 암모니아/산소의 반응율을 계산할 수 있다.The control unit may calculate the reaction rate of ammonia / oxygen by applying the effective volume and temperature of the SCR integrated diesel particulate filter, the flow rate of the exhaust gas, the cumulative storage amount of ammonia, the NO 2 / NO x ratio, and the aging degree.

또한, 본 발명의 다른 실시예에 따르는 특징은 SCR일체형 디젤매연필터가 장착되는 차량의 요소수 분사량 제어방법에 있어서, 차량의 운행에 따른 주행거리와 연료 소모량 및 SCR일체형 디젤매연필터의 재생 종료후 전후단의 차압을 적용하여 Ash 퇴적량을 산출하는 과정; Ash의 퇴적에 따른 SCR일체형 디젤매연필터의 유효체적 감소분을 계산하는 과정; SCR일체형 디젤매연필터의 암모니아 반응율을 계산하고, 암모니아 반응율에 유효체적 감소분을 반영하여 암모니아 소모량을 계산하는 과정; 암모니아 소모량에 따라 요소수 필요 분사량을 결정하여 요소수 분사를 제어하는 과정를 포함하는 차량의 요소수 분사량 제어방법이 제공된다.In addition, a feature according to another embodiment of the present invention is a method for controlling the urea water injection amount of a vehicle equipped with the SCR integrated diesel particulate filter, after the end of the regeneration of the driving distance and fuel consumption and the SCR integrated diesel particulate filter Calculating ash deposition amount by applying the differential pressure at the front and rear ends; Calculating the effective volume reduction of the SCR integrated diesel particulate filter according to the deposition of Ash; Calculating ammonia reaction rate of the SCR integrated diesel particulate filter and calculating ammonia consumption by reflecting the effective volume reduction in the ammonia reaction rate; There is provided a method of controlling a urea water injection amount of a vehicle including determining a required amount of urea water according to ammonia consumption and controlling urea water injection.

상기 SCR일체형 디젤매연필터의 암모니아 반응율은 암모니아/NOx 반응율과 암모니아/산소 반응율의 합으로 결정될 수 있다.The ammonia reaction rate of the SCR integrated diesel particulate filter may be determined by the sum of the ammonia / NOx reaction rate and the ammonia / oxygen reaction rate.

상기 암모니아/NOx 반응율은 SCR일체형 디젤매연필터의 유효체적, 온도, 배출가스의 유속, NOx 농도, 암모니아 누적저장량, NO2/NOx 비율, 에이징도가 적용되어 결정될 수 있다.The ammonia / NOx reaction rate may be determined by applying the effective volume, temperature, flow rate of exhaust gas, NOx concentration, ammonia accumulation amount, NO2 / NOx ratio, and aging degree of the SCR integrated diesel particulate filter.

상기 암모니아/산소 반응율은 SCR일체형 디젤매연필터의 유효체적과 온도, 배출가스의 유속, 암모니아 누적저장량, NO2/NOx 비율, 에이징도가 적용되어 결정될 수 있다.The ammonia / oxygen reaction rate may be determined by applying the effective volume and temperature of the SCR integrated diesel particulate filter, the flow rate of the exhaust gas, the accumulation amount of ammonia, the NO 2 / NO x ratio, and the aging degree.

이와 같이 본 발명은, 디젤차량에 SCR일체형 디젤매연필터(SDPF)를 장착하여 원가절감과 중량감소 및 연비향상을 제공하며, 주행거리의 증가에 따라 증대되는 Ash 퇴적량을 적용한 요소수 분사량의 결정으로 요소수 분사에 정밀제어가 제공될 수 있다.As described above, the present invention provides an SCR integrated diesel particulate filter (SDPF) in a diesel vehicle to provide cost reduction, weight reduction, and fuel efficiency improvement, and to determine the amount of urea injection amount to which the ash deposition amount increased as the mileage increases. As such, precise control can be provided for urea water injection.

또한, 요소수 분사량의 정밀 제어에 따라 암모니아 슬립이 발생되지 않아 상품성 향상을 제공할 수 있다.In addition, according to the precise control of the amount of urea water injection, ammonia slip may not occur, thereby providing an improvement in the commerciality.

도 1은 본 발명의 실시예에 따른 차량의 요소수 분사량 제어장치를 개략적으로 도시한 도면이다.
도 2는 본 발명의 실시예에 따른 차량의 요소수 분사량 제어절차를 개략적으로 도시한 흐름도이다.
도 3은 SCR일체형 디젤매연필터의 Ash 퇴적량과 DPF 유효체적의 관계를 도시한 도면이다.
도 4는 SCR일체형 디젤매연필터의 DPF 유효체적과 NOx 정화율 특성을 도시한 도면이다.BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view schematically showing an apparatus for controlling a urea water injection quantity of a vehicle according to an embodiment of the present invention; FIG.
2 is a flowchart schematically showing a procedure of controlling the elliptic water injection quantity of the vehicle according to the embodiment of the present invention.
3 is a view showing the relationship between the ash deposition amount and the DPF effective volume of the SCR integrated diesel particulate filter.
4 is a view showing the DPF effective volume and NOx purification rate characteristics of the SCR integrated diesel particulate filter.

이하, 첨부된 도면을 참조하여 본 발명의 실시예를 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세하게 설명하면 다음과 같다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

본 발명은 여러 가지 상이한 형태로 구현될 수 있으며 여기에서 설명하는 실시예에 한정되지 않는다.The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

본 발명을 명확하게 설명하기 위해서 설명과 관계없는 부분은 생략하였으며, 명세서 전체를 통하여 동일 또는 유사한 구성요소에 대해서는 동일한 참조 부호를 부여한다.In order to clearly describe the present invention, parts irrelevant to the description are omitted, and like reference numerals designate like elements throughout the specification.

또한, 도면에서 나타난 각 구성은 설명의 편의를 위해 임의로 나타내었으므로, 본 발명이 반드시 도면에 도시된 바에 한정되지 않는다.In addition, since each configuration shown in the drawings is arbitrarily shown for convenience of description, the present invention is not necessarily limited to those shown in the drawings.

도 1은 본 발명의 실시예에 따른 차량의 요소수 분사량 제어장치를 개략적으로 도시한 도면이다.BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view schematically showing an apparatus for controlling a urea water injection quantity of a vehicle according to an embodiment of the present invention; FIG.

도 1을 참조하면, 본 발명의 실시예는 엔진(1)과, 배기 파이프(3), 디젤산화촉매(5), SCR일체형 디젤매연필터(10), 제1차압센서(12), 제2차압센서(14), 온도센서(16), 제어부(18), 도징모듈(20), 믹서(22), 요소탱크(30), 펌프(32), 요소공급라인(34) 및 압력센서(36)을 포함한다.1, an embodiment of the present invention includes an engine 1, an exhaust pipe 3, a diesel oxidation catalyst 5, an SCR integrated diesel particulate filter 10, a first differential pressure sensor 12, A pressure sensor 36, a pressure sensor 36, a temperature sensor 16, a controller 18, a dosing module 20, a mixer 22, an element tank 30, a pump 32, an element supply line 34, ).

상기 DOC(5)는 엔진(1)에 가까이 장착되어 산화반응을 통해 배출가스에 포함된 NOx를 정화한다.The DOC 5 is mounted close to the engine 1 to purify NOx contained in the exhaust gas through an oxidation reaction.

SCR일체형 디젤매연필터(10)는 통상적인 디젤매연필터의 내부에 V2O5/TiO2 또는 Pt/Al2O3 또는 제올라이트(Zeolite) 등의 물질이 코팅 처리되어 구성되며, 도징모듈(20)에서 분사되는 요소수로부터 취득되는 암모니아와 NOx의 환원반응으로 NOx를 정화하고, PM을 포집하여 입자상 물질이 배출되는 것을 차단한다.SCR integrated diesel particulate filter 10 is composed of a coating material such as V 2 O 5 / TiO 2 or Pt / Al 2 O 3 or zeolite (Zeolite) inside the conventional diesel particulate filter, the dosing module 20 The NOx is purified by the reduction reaction of ammonia and NOx obtained from the urea water sprayed from), and PM is collected to block the discharge of particulate matter.

제1차압센서(12)는 SCR일체형 디젤매연필터(10)에 입력되는 배출가스의 압력을 검출하여 제어부(18)에 제공한다.The first differential pressure sensor 12 detects the pressure of the exhaust gas input to the SCR integrated diesel particulate filter 10 and provides the detected pressure to the control unit 18.

제2차압센서(14)는 SCR일체형 디젤매연피터(10)에서 배출되는 배출가스의 압력을 검출하여 제어부(18)에 제공한다.The second differential pressure sensor 14 detects the pressure of the exhaust gas discharged from the SCR integrated diesel soot pump 10 and provides it to the controller 18.

온도센서(16)는 배출가스에 의해 활성화되는 SCR일체형 디젤매연필터(10)의 온도를 검출하여 제어부(18)에 제공한다.The temperature sensor 16 detects the temperature of the SCR-integrated diesel particulate filter 10 activated by the exhaust gas and provides it to the control unit 18.

제어부(18)는 주행거리의 증가에 따른 Ash의 퇴적으로 발생되는 SCR일체형 디젤매연필터(10)의 유효체적을 계산하고, SCR일체형 디젤매연필터(10)의 암모니아/NOx 반응율과 암모니아/산소 반응율의 합하여 전체 암모니아 반응율을 계산한다.The controller 18 calculates the effective volume of the SCR integrated diesel particulate filter 10 generated by the deposition of Ash as the mileage increases, and the ammonia / NOx reaction rate and the ammonia / oxygen reaction ratio of the SCR integrated diesel particulate filter 10. Calculate the overall ammonia reaction rate.

그리고, 상기 제어부(18)는 상기 전체 암모니아 반응율에 Ash 퇴적에 의한 유효체적의 감소분을 반영하여 암모니아 소모량을 계산하고, 암모니아 저장량에서 암모니아 소모량을 차감 계산하여 요소수 필요 분사량을 산출한다.The controller 18 calculates ammonia consumption by reflecting the reduction of the effective volume due to Ash deposition in the overall ammonia reaction rate, and calculates the required amount of urea water by calculating the ammonia consumption from the ammonia storage.

상기 제어부(18)는 Ash 퇴적에 의한 유효체적의 감소분이 반영되어 요소수 필요 분사량이 산출되면 도징모듈(20)을 통해 요소수 분사를 실행하여 암모니아 슬립이 발생되지 않는 상태에서 최적의 NOx 정화 성능이 제공될 수 있도록 한다.The controller 18 reflects a decrease in the effective volume due to ash deposition, and when the required amount of urea water is injected, the urea water is injected through the dosing module 20 to optimize the NOx purification performance without ammonia slip. To be provided.

상기 제어부(18)는 차량의 주행거리, 연료 소모량, SCR일체형 디젤매연필터(10)의 재생 종료후 전후단의 차압을 적용하여 Ash 퇴적량을 산출한다.The controller 18 calculates the ash deposition amount by applying the vehicle's mileage, fuel consumption, and differential pressure at the front and rear ends after the regeneration of the SCR integrated diesel particulate filter 10 is completed.

상기 제어부(18)는 SCR일체형 디젤매연필터(10)의 유효체적과 온도센서(16)에서 검출되는 SCR일체형 디젤매연필터(10)의 온도, SCR일체형 디젤매연필터(10)를 통과하는 배출가스의 유속, NOx 농도, 암모니아 누적저장량, NO2/NOx 비율, SCR일체형 디젤매연필터(10)의 에이징도를 적용하여 암모니아/NOx의 반응율을 계산한다.The control unit 18 is the effective volume of the SCR integrated diesel particulate filter 10 and the temperature of the SCR integrated diesel particulate filter 10 detected by the temperature sensor 16, the exhaust gas passing through the SCR integrated diesel particulate filter 10. The reaction rate of ammonia / NOx is calculated by applying the flow rate, the NOx concentration, the cumulative storage amount of ammonia, the NO2 / NOx ratio, and the aging degree of the SCR integrated diesel particulate filter 10.

상기 제어부(18)는 SCR일체형 디젤매연필터(10)의 유효체적과 온도센서(16)에서 검출되는 SCR일체형 디젤매연필터(10)의 온도, SCR일체형 디젤매연필터(10)를 통과하는 배출가스의 유속, 암모니아 누적저장량, NO2/NOx 비율, SCR일체형 디젤매연필터(10)의 에이징도를 적용하여 암모니아/산소의 반응율을 계산한다.The control unit 18 is the effective volume of the SCR integrated diesel particulate filter 10 and the temperature of the SCR integrated diesel particulate filter 10 detected by the temperature sensor 16, the exhaust gas passing through the SCR integrated diesel particulate filter 10. The reaction rate of ammonia / oxygen is calculated by applying the flow rate, ammonia cumulative storage amount, NO2 / NOx ratio, and aging degree of the SCR integrated diesel particulate filter 10.

도징모듈(20)는 제어부(18)에서 인가되는 PWM(Pulse Width Modulation)신호에 따라 인젝터가 작동되어 Ash 퇴적량이 적용되어 결정된 요소수량을 고압으로 분사한다.The dosing module 20 operates the injector in accordance with a pulse width modulation (PWM) signal applied from the controller 18 to inject the determined amount of urea at a high pressure by applying the ash deposition amount.

믹서(22)는 도징모듈(20)과 SCR일체형 디젤매연필터(10)의 사이에 배치되어 도징모듈(20)을 통해 분사되는 요소수 입자를 충돌시켜 입자를 쪼개는 역할을 하며, 이를 통해 배출가스와 요소수 입자가 골고루 섞이도록 하여 배출가스내의 NOx와 요소수로부터 생성된 암모니아를 최적으로 혼합시킨다.The mixer 22 is disposed between the dosing module 20 and the SCR integrated diesel particulate filter 10 to collide the urea water particles injected through the dosing module 20 to divide the particles, And the urea water particles are evenly mixed to optimally mix the NOx in the exhaust gas and the ammonia generated from the urea water.

요소탱크(30)는 분사하기 위한 요소수가 수용되고, 내부에 장착되는 펌프(32)의 구동으로 요소공급라인(34)에 설정된 균등한 압력을 형성시킨다.The urea tank 30 receives the element water for jetting, and drives the pump 32 mounted therein to form an even pressure set in the element supply line 34.

압력센서(36)는 요소공급라인(34)에 형성되는 압력을 검출하여 그에 대한 정보를 제어부(18)에 제공하여 엔진(1)이 시동 온을 유지하고 있는 상태에서 항상 설정된 압력이 유지될 수 있도록 한다.The pressure sensor 36 detects the pressure formed on the element supply line 34 and provides the information to the control unit 18 so that the pressure set at all times can be maintained in a state in which the engine 1 is kept in the start- .

전술한 바와 같은 기능을 포함하는 본 발명의 동작은 다음과 같이 실행된다.The operation of the present invention including the functions as described above is executed as follows.

SCR일체형 디젤매연필터가 장착되는 본 발명의 실시예에 따른 디젤 차량의 운행이 개시되면 제어부(18)는 적산계로부터 제공되는 주행거리, 연료소모량, 제1차압센서(12)와 제2차압센서(14)로부터 SCR일체형 디젤매연필터(10)의 전후단 차압을 검출한다(S101).When the operation of the diesel vehicle according to the embodiment of the present invention, in which the SCR integrated diesel particulate filter is mounted, the controller 18 may include a driving distance, a fuel consumption amount, a first differential pressure sensor 12 and a second differential pressure sensor provided from the totalizer. 14, the front and rear differential pressures of the SCR integrated diesel particulate filter 10 are detected (S101).

상기 제어부(18)는 차량의 주행거리, 연료 소모량, SCR일체형 디젤매연필터(10)의 재생 종료후 전후단의 차압을 적용하여 Ash 퇴적량을 산출하고(S102), Ash의 퇴적량에 따른 SCR일체형 디젤매연필터(10)의 유효체적을 계산한다(S103).The controller 18 calculates the ash deposition amount by applying the vehicle's mileage, fuel consumption, and differential pressure at the front and rear ends after the regeneration of the SCR integrated diesel particulate filter 10 (S102), and the SCR according to the ash deposition amount. The effective volume of the integrated diesel particulate filter 10 is calculated (S103).

그리고, 제어부(18)는 SCR일체형 디젤매연필터(10)의 유효체적과 온도센서(16)에서 검출되는 SCR일체형 디젤매연필터(10)의 온도, SCR일체형 디젤매연필터(10)를 통과하는 배출가스의 유속, NOx 농도, 암모니아 누적저장량, NO2/NOx 비율, SCR일체형 디젤매연필터(10)의 에이징도를 적용하여 암모니아/NOx의 반응율을 계산한다(S104).In addition, the controller 18 discharges the effective volume of the SCR integrated diesel particulate filter 10 and the temperature of the SCR integrated diesel particulate filter 10 detected by the temperature sensor 16 and the SCR integrated diesel particulate filter 10. The reaction rate of ammonia / NOx is calculated by applying the gas flow rate, the NOx concentration, the ammonia accumulation amount, the NO2 / NOx ratio, and the aging degree of the SCR integrated diesel particulate filter 10 (S104).

또한, 제어부(18)는 SCR일체형 디젤매연필터(10)의 유효체적과 온도센서(16)에서 검출되는 SCR일체형 디젤매연필터(10)의 온도, SCR일체형 디젤매연필터(10)를 통과하는 배출가스의 유속, 암모니아 누적저장량, NO2/NOx 비율, SCR일체형 디젤매연필터(10)의 에이징도를 적용하여 암모니아/산소의 반응율을 계산한다(S105).In addition, the controller 18 discharges the effective volume of the SCR integrated diesel particulate filter 10 and the temperature of the SCR integrated diesel particulate filter 10 detected by the temperature sensor 16 and the SCR integrated diesel particulate filter 10. The reaction rate of ammonia / oxygen is calculated by applying the gas flow rate, the cumulative storage amount of ammonia, the NO 2 / NO x ratio, and the aging degree of the SCR integrated diesel particulate filter 10 (S105).

상기 S104에서 SCR일체형 디젤매연필터(10)의 암모니아/NOx의 반응율이 계산되고 S105에서 SCR일체형 디젤매연필터(10)의 암모니아/산소의 반응율이 계산되면 암모니아/NOx 반응율과 암모니아/산소의 반응율을 합하여 전체 암모니아 반응율을 계산한다(S106).When the reaction rate of ammonia / NOx of the SCR integrated diesel particulate filter 10 is calculated in S104, and the reaction rate of ammonia / oxygen of the SCR integrated diesel particulate filter 10 is calculated in S105, the reaction rate of ammonia / NOx reaction and ammonia / oxygen is determined. The total ammonia reaction rate is calculated (S106).

상기 S106에서 전체 암모니아 반응율이 계산되면 제어부(18)는 전체 암모니아 반응율에 Ash 퇴적에 의한 유효체적의 감소분을 반영하여 암모니아 소모량을 계산한다(S107).When the total ammonia reaction rate is calculated in S106, the controller 18 calculates the ammonia consumption amount by reflecting the reduction of the effective volume due to Ash deposition in the overall ammonia reaction rate (S107).

상기 S107에서 SCR일체형 디젤매연필터(10)의 유효체적 감소분이 반영되어 암모니아 소모량이 계산되면 암모니아 저장량에서 암모니아 소모량을 차감 계산하여 요소수 필요 분사량을 산출한다(S108).When the effective volume reduction of the SCR integrated diesel particulate filter 10 is reflected in S107 and the ammonia consumption is calculated, the required amount of urea water is calculated by calculating the ammonia consumption from the ammonia storage amount (S108).

이후, 상기 제어부(18)는 PWM신호로 도징모듈(20)의 인젝터를 제어하여 상기에서 산출된 필요 요소수량을 고압으로 분사하여 암모니아 슬립이 발생되지 않는 상태에서 최적의 NOx 정화 성능이 제공될 수 있도록 한다(S109).Thereafter, the controller 18 controls the injector of the dosing module 20 with a PWM signal to inject the required amount of urea calculated at a high pressure to provide optimum NOx purification performance in a state where ammonia slip is not generated. (S109).

이상과 같이, 본 발명은 비록 한정된 실시예와 도면에 의해 설명되었으나, 본 발명은 이것에 의해 한정되지 않으며 본 발명이 속하는 기술 분야에서 통상의 지식을 가진자에 의해 본 발명의 기술 사상과 아래에 기재될 특허청구범위의 균등범위 내에서 다양한 수정 및 변형이 가능함은 물론이다.While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

10 : SCR일체형 디젤매연필터 12 : 제1차압센서
14 : 제2차압센서 16 : 온도센서
18 : 제어부 20 : 도징모듈10: SCR integrated diesel particulate filter 12: 1st differential pressure sensor
14: Secondary pressure sensor 16: Temperature sensor
18: control section 20: dosing module

Claims (9)

엔진의 배출가스에 포함된 NOx와 요소수로부터 취득한 암모니아를 환원반응시켜 NOx를 정화하고, PM을 포집하는 SCR일체형 디젤매연필터;
상기 SCR일체형 디젤매연필터의 전단에 요소수를 분사하는 도징모듈;
을 포함하며,
Ash의 퇴적에 따른 SCR일체형 디젤매연필터의 유효체적 감소분을 계산하고, SCR일체형 디젤매연필터의 암모니아 반응율을 계산하며, 암모니아 반응율에 유효체적 감소분을 반영하여 암모니아 소모량을 계산하고, 요소수 필요 분사량을 산출하여 도징모듈을 통해 요소수 분사를 제어하는 제어부;
를 포함하는 차량의 요소수 분사량 제어장치.An SCR integrated diesel particulate filter for purifying NOx by reducing reaction between NOx contained in the exhaust gas of the engine and ammonia obtained from urea water to collect PM;
A dosing module for injecting urea water into a front end of the SCR integrated diesel particulate filter;
/ RTI >
Calculate effective volume reduction of SCR integrated diesel particulate filter according to ash deposition, calculate ammonia reaction rate of SCR integrated diesel particulate filter, calculate ammonia consumption by reflecting effective volume decrease in ammonia reaction rate, and calculate required injection volume of urea water A control unit for calculating and controlling urea water injection through the dosing module;
Urea water injection amount control device of a vehicle comprising a. 제1항에 있어서,
상기 제어부는 차량의 주행거리, 연료 소모량, SCR일체형 디젤매연필터의 재생 종료후 전후단의 차압을 적용하여 Ash 퇴적량을 산출하고, Ash 퇴적량에 따른 유효체적을 추출하는 것을 특징으로 하는 차량의 요소수 분사량 제어장치.The method of claim 1,
Wherein the control section calculates the Ash accumulation amount by applying the driving distance of the vehicle, the fuel consumption amount, and the differential pressure between the front and rear ends of the SCR integrated diesel particulate filter after the regeneration, and extracts an effective volume corresponding to the Ash accumulation amount Elementary water injection quantity control device. 제1항에 있어서,
상기 제어부는 SCR일체형 디젤매연필터의 암모니아 반응율은 암모니아/NOx의 반응율과 암모니아/산소의 반응율 합으로 계산하는 것을 특징으로 하는 차량의 요소수 분사량 제어장치.The method of claim 1,
The control unit is a urea water injection amount control apparatus for a vehicle characterized in that the ammonia reaction rate of the SCR integrated diesel particulate filter is calculated by the sum of the reaction rate of ammonia / NOx and the reaction rate of ammonia / oxygen. 제3항에 있어서,
상기 제어부는 SCR일체형 디젤매연필터의 유효체적, 온도, 배출가스의 유속, NOx 농도, 암모니아 누적저장량, NO2/NOx 비율, 에이징도를 적용하여 암모니아/NOx의 반응율을 계산하는 것을 특징으로 하는 차량의 요소수 분사량 제어장치.The method of claim 3,
The control unit calculates the reaction rate of ammonia / NOx by applying the effective volume, temperature, exhaust gas flow rate, NOx concentration, ammonia accumulation amount, NO2 / NOx ratio, and aging degree of the SCR integrated diesel particulate filter. Urea water injection rate control device. 제3항에 있어서,
상기 제어부는 SCR일체형 디젤매연필터의 유효체적과 온도, 배출가스의 유속, 암모니아 누적저장량, NO2/NOx 비율, 에이징도를 적용하여 암모니아/산소의 반응율을 계산하는 것을 특징으로 하는 차량의 요소수 분사량 제어장치.The method of claim 3,
The control unit calculates the reaction rate of ammonia / oxygen by applying the effective volume and temperature of the SCR integrated diesel particulate filter, the flow rate of the exhaust gas, the accumulated ammonia storage amount, the NO2 / NOx ratio, and the aging degree. Control unit. SCR일체형 디젤매연필터가 장착되는 차량의 요소수 분사량 제어방법에 있어서,
차량의 운행에 따른 주행거리와 연료 소모량 및 SCR일체형 디젤매연필터의 재생 종료후 전후단의 차압을 적용하여 Ash 퇴적량을 산출하는 과정;
Ash의 퇴적에 따른 SCR일체형 디젤매연필터의 유효체적 감소분을 계산하는 과정;
SCR일체형 디젤매연필터의 암모니아 반응율을 계산하고, 암모니아 반응율에 유효체적 감소분을 반영하여 암모니아 소모량을 계산하는 과정;
암모니아 소모량에 따라 요소수 필요 분사량을 결정하여 요소수 분사를 제어하는 과정;
를 포함하는 차량의 요소수 분사량 제어방법.A method of controlling a urea injection quantity of a vehicle in which an SCR integral diesel particulate filter is mounted,
Calculating ash accumulation amount by applying the mileage and fuel consumption according to the operation of the vehicle and the differential pressure at the front and rear ends after the regeneration of the SCR integrated diesel particulate filter;
Calculating the effective volume reduction of the SCR integrated diesel particulate filter according to the deposition of Ash;
Calculating ammonia reaction rate of the SCR integrated diesel particulate filter and calculating ammonia consumption by reflecting the effective volume reduction in the ammonia reaction rate;
Controlling the urea water injection by determining the required amount of urea water according to the ammonia consumption;
And controlling the injection amount of the injected fuel. 제6항에 있어서,
상기 SCR일체형 디젤매연필터의 암모니아 반응율은 암모니아/NOx 반응율과 암모니아/산소 반응율의 합으로 결정되는 것을 특징으로 하는 차량의 요소수 분사량 제어방법.The method according to claim 6,
The ammonia reaction rate of the SCR integrated diesel particulate filter is determined by the sum of the ammonia / NOx reaction rate and the ammonia / oxygen reaction rate. 제7항에 있어서,
상기 암모니아/NOx 반응율은 SCR일체형 디젤매연필터의 유효체적, 온도, 배출가스의 유속, NOx 농도, 암모니아 누적저장량, NO2/NOx 비율, 에이징도가 적용되어 결정되는 것을 특징으로 하는 차량의 요소수 분사량 제어방법.The method of claim 7, wherein
The ammonia / NOx reaction rate is determined by applying the effective volume, temperature, exhaust gas flow rate, NOx concentration, ammonia accumulation amount, NO2 / NOx ratio, and aging degree of the SCR integrated diesel particulate filter. Control method. 제7항에 있어서,
상기 암모니아/산소 반응율은 SCR일체형 디젤매연필터의 유효체적과 온도, 배출가스의 유속, 암모니아 누적저장량, NO2/NOx 비율, 에이징도가 적용되어 결정되는 것을 특징으로 하는 차량의 요소수 분사량 제어방법.The method of claim 7, wherein
The ammonia / oxygen reaction rate is determined by applying the effective volume and temperature of the SCR integrated diesel particulate filter, the flow rate of the exhaust gas, the cumulative storage amount of ammonia, the NO2 / NOx ratio, the aging degree.
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