KR101114385B1 - Apparatus for protection emission reduce line of diesel vehicle and method thereof - Google Patents

Apparatus for protection emission reduce line of diesel vehicle and method thereof Download PDF

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KR101114385B1
KR101114385B1 KR1020090082161A KR20090082161A KR101114385B1 KR 101114385 B1 KR101114385 B1 KR 101114385B1 KR 1020090082161 A KR1020090082161 A KR 1020090082161A KR 20090082161 A KR20090082161 A KR 20090082161A KR 101114385 B1 KR101114385 B1 KR 101114385B1
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oxidation catalyst
particulate filter
temperature
diesel particulate
regeneration
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KR1020090082161A
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KR20110024252A (en
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박지원
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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
    • F01N9/00—Electrical control of exhaust gas treating apparatus
    • F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
    • 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
    • F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
    • F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • 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
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0402—Methods of control or diagnosing using adaptive learning
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • 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
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/16—Parameters used for exhaust control or diagnosing said parameters being related to the exhaust apparatus, e.g. particulate filter or catalyst
    • F01N2900/1602—Temperature of exhaust gas apparatus
    • 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

Abstract

본 발명은 산화촉매(Diesel Oxidation Catalyst : DOC)와 디젤매연필터(Diesel Particulate Filter : DPF)로 구성되는 디젤차량의 후처리 시스템에서, 디젤매연필터의 재생시 산화촉매의 전후단 온도 차이를 비교하여 발열량이 클 경우 디젤매연필터의 재생을 억제시켜 비정상적인 온도 상승에 의해 디젤매연필터가 소손 되는 것을 방지하는 것이다. The present invention compares the temperature difference between the front and rear end of the oxidation catalyst during regeneration of the diesel particulate filter in a diesel vehicle aftertreatment system composed of a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF). If the calorific value is large, the regeneration of the diesel particulate filter is suppressed to prevent the diesel particulate filter from being burned out by abnormal temperature rise.

본 발명은 엔진이 시동 온 되면 제반 운전정보를 검출 분석하여 산화촉매의 산화능 조건을 만족하는지 판정하는 과정; 상기 산화촉매의 산화능 조건을 만족하면 상기 산화촉매가 미연소 탄화수소의 슬립을 발생시키는 한계온도를 설정하는 과정; 디젤매연필터의 양단간 차압이 재생 조건을 만족하는지 판단하여 재생 조건이면 후분사 제어를 통해 재생을 실행하는 과정; 디젤매연필터의 재생 과정에서 산화촉매 양단간의 온도를 검출하여 온도차가 설정된 기준온도를 초과하였는지 판단하는 과정; 상기 산화촉매 양단간의 온도차가 설정된 기준온도를 초과하였으면 디젤매연필터에 미연소된 탄화수소가 과도하게 유입되는 것으로 판정하여 후분사를 금지시켜 디젤매연필터의 재생 동작을 중지하는 과정을 포함한다.The present invention comprises the steps of detecting and analyzing the overall operation information when the engine is turned on to determine whether the oxidative performance of the oxidation catalyst is satisfied; Setting a threshold temperature at which the oxidation catalyst generates slips of unburned hydrocarbons when the oxidation performance condition of the oxidation catalyst is satisfied; Determining whether the differential pressure between the two ends of the diesel particulate filter satisfies the regeneration condition and performing regeneration through post injection control if the regeneration condition is satisfied; Determining whether a temperature difference exceeds a predetermined reference temperature by detecting a temperature between both ends of the oxidation catalyst in a regeneration process of the diesel particulate filter; If the temperature difference between the both ends of the oxidation catalyst exceeds the set reference temperature, it is determined that the unburned hydrocarbon is excessively introduced into the diesel particulate filter to inhibit the after injection to stop the regeneration operation of the diesel particulate filter.

후처리계, 산화촉매, 디젤매연필터, HC, 재생, 슬립, 한계온도 Post-treatment system, oxidation catalyst, diesel particulate filter, HC, regeneration, slip, limit temperature

Description

디젤차량의 후처리계 보호장치 및 방법{APPARATUS FOR PROTECTION EMISSION REDUCE LINE OF DIESEL VEHICLE AND METHOD THEREOF} APPARATUS FOR PROTECTION EMISSION REDUCE LINE OF DIESEL VEHICLE AND METHOD THEREOF}

본 발명은 산화촉매(Diesel Oxidation Catalyst : DOC)와 디젤매연필터(Diesel Particulate Filter : DPF)로 구성되는 디젤차량의 후처리 시스템에 관한 것으로, 보다 상세하게는 디젤매연필터의 재생시 산화촉매의 전후단 온도 차이를 비교하여 발열량이 클 경우 디젤매연필터의 재생을 억제시켜 비정상적인 온도 상승에 의해 디젤매연필터가 소손 되는 것을 방지하는 디젤차량의 후처리계 보호장치 및 방법에 관한 것이다. The present invention relates to a post-treatment system of a diesel vehicle composed of a diesel oxidation catalyst (DOC) and a diesel particulate filter (DPF), and more particularly, before and after the oxidation catalyst during regeneration of the diesel particulate filter. However, the present invention relates to an after-treatment system protection apparatus and method for preventing a diesel particulate filter from being burned out due to abnormal temperature rise by suppressing the regeneration of the diesel particulate filter when a large amount of heat is compared.

일반적으로 엔진에서 배출되는 배기가스는 배기 파이프의 중간에 배치되는 촉매장치(Catalytic Converter)로 유도되어 정화되고 머플러를 통과하면서 소음이 감쇄된 후 테일 배기 파이프를 통해 대기로 방출된다.In general, the exhaust gas emitted from the engine is guided to a catalytic converter disposed in the middle of the exhaust pipe, purified, passed through a muffler, noise is attenuated, and discharged to the atmosphere through the tail exhaust pipe.

OBD 규제에서는 날로 강화되는 배기가스(Emission)의 규제뿐만 아니라 배기가스 관련 부품의 고장, 열화정도까지 감지하도록 하는 진단 능력의 향상과 개선, 그리고 A/S(After Service) 시장에서의 표준화와 관련된 여러 가지 규정을 만족하도록 요구하고 있다.In the OBD regulation, not only the regulation of emission regulations, which is strengthened day by day, but also the improvement and improvement of the diagnostic ability to detect the failure and deterioration of exhaust components, and the standardization in the after service market It is required to satisfy several regulations.

북미디젤 Tier2 BIN5 규제나 유로 6 배기가스 규제를 만족시키기 위하여 후처리계 시스템으로 산화촉매, 디젤매연필터, LNT(Lean NOx Trap), 우레아(Urea)를 이용하는 SCR((Selective Catalytic Reduction) 촉매 등이 적용되고 있으며, 차량의 설계에 따라 상기의 촉매들의 조합과 배치 위치가 서로 다르게 결정된다.In order to meet the North American diesel Tier 2 BIN5 regulation and Euro 6 emission regulations, after-treatment systems include oxidation catalyst, diesel particulate filter, lean NOx trap (LNT), and selective catalytic reduction (SCR) catalyst using urea. The combination of the catalysts and the arrangement position of the catalysts are determined differently according to the design of the vehicle.

통상적으로, 산화촉매는 배기 파이프에서 맨 상류측에 배치되며, 배기가스에 포함된 유해한 물질인 CO(일산화탄소), HC(탄화수소)와 입자상 물질 중에서 용해성 유기물질(SOF)을 세라믹 담체에 코팅된 백금계 촉매와 반응시켜 CO2(이산화탄소), H2O(물)로 정화한다.Typically, the oxidation catalyst is disposed upstream of the exhaust pipe and is coated with a ceramic carrier coated with a soluble organic substance (SOF) among the harmful substances CO (carbon monoxide), HC (hydrocarbon) and particulate matter contained in the exhaust gas. It is reacted with the catalyst to purify with CO2 (carbon dioxide) and H2O (water).

디젤매연필터는 산화촉매의 하류측에 배치되어 배기가스에 포함된 입자상 물질을 물리적으로 포집하고, 일정거리 주행 후 후분사를 통해 상승되는 배기가스의 온도에 의해 포집된 입자상 물질이 연소되어 재생된다.The diesel particulate filter is disposed downstream of the oxidation catalyst to physically collect particulate matter contained in the exhaust gas, and the particulate matter collected by the exhaust gas temperature which is raised through post injection after a certain distance is burned and regenerated. .

산화촉매와 디젤매연필터로 후처리 시스템을 구성하는 종래의 디젤차량은 산화촉매를 통해 HC(탄화수소) 및 CO(일산화탄소)를 정화시키고, 디젤매연필터의 재생시에 포집된 입자상 물질을 제거하기 위하여 배기온도를 상승시키는 제어를 실행한다.Conventional diesel vehicles constituting the aftertreatment system with an oxidation catalyst and a diesel particulate filter purify HC (hydrocarbon) and CO (carbon monoxide) through the oxidation catalyst, and exhaust the particulate matter collected during regeneration of the diesel particulate filter. A control to raise the temperature is performed.

상기 디젤매연필터에 포함된 그을음(Soot) 등의 입자상 물질을 제거시키기 위해서는 대략적으로 500 ~ 600℃의 고온의 온도가 필요하므로, 배기가스의 온도를 상승시키기 위하여 연료 후분사 제어가 실행된다.In order to remove particulate matter, such as soot, contained in the diesel particulate filter, a high temperature of approximately 500 to 600 ° C. is required, so that fuel post-injection control is executed to increase the temperature of the exhaust gas.

연료 후분사 제어가 실행되면 연소실에서 미처 연소되지 못한 HC(탄화수소)가 산화촉매로 유입되며, 산화촉매에서 HC(탄화수소)의 산화 반응에 의해 발열되어 배기가스의 온도를 상승시켜 준다. When the fuel post injection control is executed, HC (hydrocarbon) that has not been burned in the combustion chamber flows into the oxidation catalyst, and is heated by the oxidation reaction of HC (hydrocarbon) in the oxidation catalyst to raise the temperature of the exhaust gas.

그러나, 저속/저부하 영역에서는 초기 엔진에서 나오는 배기가스의 온도가 너무 낮아 고속/고부하 영역과 대비하여 보다 많은 양의 후 분사가 이루어지며, 산화촉매가 에이징(Aging) 또는 일부분 기능이 손실된 경우 너무나 많은 양의 후분사가 이루어져 미처 연소되지 못한 HC(탄화수소)가 과도하게 배출된다. However, in the low speed / low load region, the exhaust gas from the initial engine is too low to produce a larger amount of post-injection compared to the high speed / high load region, and the oxidation catalyst has lost aging or partial loss of function. Too much post-injection results in excessive release of HC (hydrocarbons) that could not be burned.

상기 배출되는 HC(탄화수소)의 일부분은 산화촉매에서 발열반응에 사용되고 나머지 일부분은 그을음 등의 입자상 물질을 포집하는 디젤매연필터로 유입된다. Part of the HC (hydrocarbon) discharged is used for the exothermic reaction in the oxidation catalyst and the other part is introduced into the diesel particulate filter that collects particulate matter such as soot.

디젤매연필터에 유입된 HC(탄화수소)는 온도에 의해 급격한 발열 반응을 일으켜 디젤매연필터의 온도 상승을 일으키며 포집된 그을음 등의 입자상 물질과 연쇄적으로 발열 반응하여 온도를 상승시키므로 디젤매연필터가 갖는 한계온도를 초과하여 디젤매연필터를 소손시키는 문제점을 발생시킨다.The HC (hydrocarbon) introduced into the diesel particulate filter causes a rapid exothermic reaction by the temperature, causing a rise in the temperature of the diesel particulate filter and the exothermic reaction with the particulate matter such as the collected soot, thereby raising the temperature. It causes a problem of burning the diesel particulate filter beyond the limit temperature.

도 4에 도시된 산화촉매 후단의 HC(탄화수소) 농도와 디젤매연필터의 온도 관계 그래프에서 알 수 있는 바와 같이, 많은 양의 후분사에 따라 미연소된 HC(탄화수소)가 과도하게 발생되어 산화촉매 후단의 HC(탄화수소) 농도가 증가되는 경우 디젤매연필터의 내부 온도가 상승되는 것을 알 수 있다.As can be seen from the temperature relationship graph of the HC (hydrocarbon) concentration and the diesel particulate filter after the oxidation catalyst shown in FIG. 4, the unburned HC (hydrocarbon) is excessively generated due to a large amount of post injection, and thus the oxidation catalyst It can be seen that the internal temperature of the diesel particulate filter is increased when the HC (hydrocarbon) concentration of the rear stage is increased.

이러한 상황에서 정상적인 디젤매연필터(Fresh)와 비교하여 에이징(Aged)된 디젤매연필터인 경우 디젤매연필터가 갖는 한계온도, 대략적으로 1250 ~1280℃ 이상으로 상승되어 디젤매연필터가 소손되는 현상이 발생된다.In this situation, when the diesel particulate filter is aged compared to the normal diesel particulate filter (Fresh), the diesel particulate filter burns out because the diesel particulate filter rises above the limit temperature of the diesel particulate filter, approximately 1250 to 1280 ℃. do.

본 발명은 상기한 문제점을 해결하기 위하여 발명한 것으로, 그 목적은 디젤매연필터의 재생이 시작되면 엔진 RPM과 부하의 조건에서 산화촉매 전단의 온도를 모델링을 통해 산출하고, 산화촉매 후단에 설치되는 열전대로부터 산화촉매 후단의 온도를 모니터링하여 온도차가 설정된 기준온도 이상이면 산화되지 못한 HC(탄화수소)가 디젤매연필터에 과도하게 유입되는 것으로 판정하여 디젤매연필터 재생을 위한 후분사를 금지시켜 디젤매연필터의 온도가 비정상적으로 상승되는 것을 방지함으로서, 디젤매연필터를 보호하는 것이다.The present invention has been invented to solve the above problems, the purpose is to calculate the temperature of the oxidation catalyst front end modeling under the conditions of the engine RPM and load when the regeneration of the diesel particulate filter is started, which is installed at the rear end of the oxidation catalyst When the temperature difference is higher than the set reference temperature, the HC (hydrocarbon) that is not oxidized is excessively introduced into the diesel particulate filter by monitoring the temperature after the oxidation catalyst from the thermocouple, and after injection, the diesel particulate filter is prohibited. It is to protect the diesel particulate filter by preventing the temperature rises abnormally.

상기한 목적을 실현하기 위한 본 발명의 특징에 따른 디젤차량의 후처리계 보호장치는, 엔진의 배기 매니폴더에 장착되어 배기가스에 포함된 탄화수소를 산화 반응시켜 정화하는 산화촉매; 상기 산화촉매의 하류측에 설치되어 그을음을 포함하는 입자상 물질을 포집하는 디젤매연필터; 상기 산화촉매의 후단에 설치되어, 산화촉매의 후단의 온도를 측정하는 열전대; 상기 디젤매연필터의 재생시 엔진 RPM과 부하로부터 산화촉매의 전단온도를 산출하고, 상기 산화촉매의 전후단 온도차를 계산하여 설정된 기준온도 이상이면 후분사를 금지하여 디젤매연필터의 재생을 중지시키는 제어부를 포함하는 디젤차량의 후처리계 보호장치에 있어서,
상기 제어부는 산화촉매의 전후단 온도 모니터링을 위해 냉각수온의 정보를 판독하여 산화촉매의 산화능을 판정하며, 산화능에 도달된 경우에 한하여 디젤매연필터의 재생을 실행하고,
산화촉매의 전후단 온도차에 따라 디젤매연필터에 유입되는 미연소 탄화수소의 양을 산출하여 기준량 이상이면 후분사를 금지하여 디젤매연필터의 재생을 중지시키는 것을 특징으로 하는 디젤차량의 후처리계 보호장치가 제공된다.A post-treatment system protection apparatus for a diesel vehicle according to a feature of the present invention for realizing the above object includes an oxidation catalyst mounted on an exhaust manifold of an engine to oxidize and purify hydrocarbons contained in exhaust gas; A diesel particulate filter disposed downstream of the oxidation catalyst to collect particulate matter including soot; A thermocouple installed at a rear end of the oxidation catalyst to measure a temperature of the rear end of the oxidation catalyst; The control unit calculates the shear temperature of the oxidation catalyst from the engine RPM and the load during regeneration of the diesel particulate filter, calculates the temperature difference between the front and rear ends of the oxidation catalyst, and stops the regeneration of the diesel particulate filter by prohibiting post injection if the reference temperature is higher than the set reference temperature. In the after-treatment system protection device of a diesel vehicle comprising:
The control unit reads the information of the cooling water temperature for monitoring the temperature before and after the oxidation catalyst to determine the oxidation capacity of the oxidation catalyst, and only when the oxidation capacity is reached, regenerating the diesel particulate filter,
The after-treatment system protection device for diesel vehicles, characterized in that the amount of unburned hydrocarbons flowing into the diesel particulate filter is calculated according to the temperature difference between the front and rear ends of the oxidation catalyst, and if the amount exceeds the reference amount, the after-injection is prohibited to stop the regeneration of the diesel particulate filter. Is provided.

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또한, 본 발명의 특징에 따른 디젤차량의 후처리계 보호방법은, 엔진이 시동 온 되면 제반 운전정보를 검출 분석하여 산화촉매의 산화능 조건을 만족하는지 판정하는 과정; 상기 산화촉매의 산화능 조건을 만족하면 상기 산화촉매가 미연소 탄화수소의 슬립을 발생시키는 한계온도를 설정하는 과정; 디젤매연필터의 양단간 차 압이 재생 조건을 만족하는지 판단하여 재생 조건이면 후분사 제어를 통해 재생을 실행하는 과정; 디젤매연필터의 재생 과정에서 산화촉매 양단간의 온도를 검출하여 온도차가 설정된 기준온도를 초과하였는지 판단하는 과정; 상기 산화촉매 양단간의 온도차가 설정된 기준온도를 초과하였으면 디젤매연필터에 미연소된 탄화수소가 과도하게 유입되는 것으로 판정하여 후분사를 금지시켜 디젤매연필터의 재생 동작을 중지하는 과정을 포함한다.In addition, the after-treatment system protection method of a diesel vehicle according to an aspect of the present invention, the process of determining whether to satisfy the oxidizing capacity of the oxidation catalyst by detecting and analyzing the overall operation information when the engine is started; Setting a threshold temperature at which the oxidation catalyst generates slips of unburned hydrocarbons when the oxidation performance condition of the oxidation catalyst is satisfied; Determining whether the pressure difference between the two ends of the diesel particulate filter satisfies the regeneration condition and performing regeneration through post injection control if the regeneration condition is satisfied; Determining whether a temperature difference exceeds a predetermined reference temperature by detecting a temperature between both ends of the oxidation catalyst in a regeneration process of the diesel particulate filter; If the temperature difference between the both ends of the oxidation catalyst exceeds the set reference temperature, it is determined that the unburned hydrocarbon is excessively introduced into the diesel particulate filter to inhibit the after injection to stop the regeneration operation of the diesel particulate filter.

전술한 구성에 의하여 본 발명은 디젤매연필터의 재생시 발생하는 HC(탄화수소)의 슬립(Slip)량을 줄여 디젤매연필터가 소손되는 것을 방지함으로써, 차량의 운행에 안정성 및 신뢰성을 제공하는 효과가 기대된다.According to the above configuration, the present invention reduces the amount of slip of HC (hydrocarbon) generated during the regeneration of the diesel particulate filter, thereby preventing the diesel particulate filter from being burned out, thereby providing stability and reliability in driving the vehicle. It is expected.

또한, 디젤매연필터의 재생시에 발화성이 큰 엔진오일 등의 이물질이 유입되는 경우 후분사를 금지함으로써, 디젤매연필터 및 차량 보호가 제공된다.In addition, when the diesel particulate filter is regenerated, foreign substances such as engine oil having a high ignition property are introduced, thereby preventing after-injection, thereby providing diesel particulate filter and vehicle protection.

아래에서는 첨부된 도면을 참고로 하여 본 발명의 실시예에 대하여 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 용이하게 실시할 수 있도록 상세히 설명한다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

본 발명은 여러가지 상이한 형태로 구현될 수 있으므로, 여기에서 설명하는 실시예에 한정되지 않으며, 도면에서 본 발명을 명확하게 설명하기 위하여 설명과 관계없는 부분은 생략하였다.Since the present invention can be implemented in various different forms, the present invention is not limited to the exemplary embodiments described herein, and parts not related to the description are omitted in the drawings in order to clearly describe the present invention.

도 1은 본 발명의 실시예에 따른 디젤차량의 후처리계 보호장치를 개략적으 로 도시한 도면이다.1 is a view schematically showing a post-treatment system protection apparatus for a diesel vehicle according to an embodiment of the present invention.

본 발명은 엔진(10)과, 엔진(10)에서 연소된 배기가스의 에너지로 엔진(10)에 흡입되는 공기를 과급시키는 터보차저(30)가 장착된다.The present invention is equipped with an engine 10 and a turbocharger 30 for supercharging the air sucked into the engine 10 by the energy of the exhaust gas combusted by the engine 10.

상기 터보차저(30)는 배기 매니폴더의 소정 위치에 임펠라(31)가 장착되고, 흡기 매니폴더의 소정 위치에 터빈(32)이 장착되어 임펠라(31)의 동작에 따라 터빈(32)이 동작되어 흡입공기를 과급시킨다.The turbocharger 30 has an impeller 31 mounted at a predetermined position of the exhaust manifold, and a turbine 32 mounted at a predetermined position of the intake manifold, so that the turbine 32 operates according to the operation of the impeller 31. To supercharge the intake air.

상기 임펠라(31)의 하류측에 배기가스에 포함된 유해물질을 정화시키는 촉매(50)가 설치된다.On the downstream side of the impeller 31, a catalyst 50 for purifying harmful substances contained in the exhaust gas is installed.

상기 촉매(50)는 배기가스에 포함된 HC(탄화수소)를 백금계 촉매와 산화 반응시켜 정화하는 산화촉매(51)와 그을음 등의 입자상 물질을 물리적으로 포집하는 디젤매연필터(53)로 구성된다.The catalyst 50 is composed of an oxidation catalyst 51 for oxidizing and purifying HC (hydrocarbon) contained in exhaust gas with a platinum-based catalyst and a diesel particulate filter 53 for physically collecting particulate matter such as soot. .

상기 산화촉매(51)의 하단측에는 열전대(52)가 설치되어 디젤매연필터(53)가 재생되는 상태에서 산화촉매(51)의 하단 온도를 검출하여 제어부(100)에 제공한다.The thermocouple 52 is installed at the lower end side of the oxidation catalyst 51 to detect and provide the lower temperature of the oxidation catalyst 51 to the controller 100 while the diesel particulate filter 53 is regenerated.

상기 디젤매연필터(53)는 상류 및 하류측에는 설치된 도시되지 않은 차압센서를 양단간의 차압을 검출하여 제어부(100)에 제공하여 제어부(100)로 하여금 연료의 후분사를 통해 디젤매연필터(53)의 재생이 이루어질 수 있도록 한다.The diesel particulate filter 53 detects the differential pressure between both ends and provides a differential pressure sensor (not shown) installed upstream and downstream to the controller 100 so that the controller 100 causes the diesel particulate filter 53 to post-inject the fuel. To allow the regeneration to occur.

제어부(100)는 본 발명에 따른 디젤차량의 엔진 시동이 온 되면 차량에 통상적으로 설치되는 각각의 센서로부터 엔진 RPM, 부하, 냉각수온, 마일리지 등의 정보를 검출 분석하여 냉각수의 온도가 설정된 기준온도를 초과하면 산화촉매(51)의 산화능으로 판정한다.The control unit 100 detects and analyzes information such as engine RPM, load, coolant temperature, and mileage from each sensor that is typically installed in the vehicle when the engine of the diesel vehicle is started, and the reference temperature at which the coolant temperature is set. When exceeding, it determines with the oxidation ability of the oxidation catalyst 51.

그리고, 디젤매연필터(53)의 양단간에 설치되는 도시되지 않은 차압센서의 정보를 분석하여 디젤매연필터(53)의 재생조건을 만족하는지 판단하여, 재생조건이면 연료의 후분사를 제어하여 디젤매연필터(53)를 재생시킨다.Then, by analyzing the information of the differential pressure sensor (not shown) provided between the both ends of the diesel particulate filter 53, it is determined whether the regeneration condition of the diesel particulate filter 53 is satisfied, and if the regeneration condition, after injection of the fuel is controlled to control the diesel particulate The filter 53 is regenerated.

상기 디젤매연필터(53)를 재생시키는 과정에서 엔진 RPM과 부하의 조건으로부터 엔진(10)에서 배출되는 배기가스의 온도, 즉 산화촉매(51)의 전단온도를 예측하고, 열전대(52)를 통해 산화촉매(51)의 후단온도를 검출하여 산화촉매(51) 양단간의 온도가 설정된 기준온도 이상인지를 판단한다.In the process of regenerating the diesel particulate filter 53, the temperature of the exhaust gas discharged from the engine 10, that is, the shear temperature of the oxidation catalyst 51 is predicted from the conditions of the engine RPM and the load, and the thermocouple 52 is used. The rear end temperature of the oxidation catalyst 51 is detected to determine whether the temperature between both ends of the oxidation catalyst 51 is equal to or higher than the set reference temperature.

상기 산화촉매(51) 양단간의 온도가 기준온도 이상이면 과도한 후분사에 의해 발생되는 연소되지 않은 HC(탄화수소)의 슬립으로 인하여 디젤매연필터(53)에 과도하게 유입되는 것으로 판정하여 디젤매연필터(53) 재생을 위한 후분사를 금지시켜 디젤매연필터(53)를 보호한다.When the temperature between both ends of the oxidation catalyst 51 is higher than the reference temperature, it is determined that excessively flows into the diesel particulate filter 53 due to slip of unburned HC (hydrocarbon) generated by excessive after-injection. 53) Protect the diesel particulate filter 53 by prohibiting post injection for regeneration.

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전술한 바와 같은 기능을 포함하는 본 발명에서 디젤매연필터의 재생시 HC(탄화수소)의 슬립에 따른 디젤매연필터를 보호하는 동작에 대하여 설명하면 다음과 같다.Referring to the operation of protecting the diesel particulate filter according to the slip of HC (hydrocarbon) during the regeneration of the diesel particulate filter in the present invention including the function as described above is as follows.

본 발명에 따른 디젤차량의 엔진 시동이 온 되면(S101) 제어부(100)는 차량에 통상적으로 설치되는 각각의 센서로부터 엔진 RPM, 부하, 냉각수온, 마일리지 등을 포함하는 운전정보를 검출한 다음(S102) 냉각수의 온도가 설정된 기준온도(a ℃), 예를 들어 85℃를 초과하는지 판단한다(S103).When the engine start of the diesel vehicle according to the present invention is turned on (S101), the control unit 100 detects driving information including engine RPM, load, coolant temperature, mileage, and the like from each sensor that is typically installed in the vehicle ( S102) It is determined whether the temperature of the cooling water exceeds a set reference temperature (a ° C), for example, 85 ° C (S103).

상기 S103의 판단에서 냉각수의 온도가 기준온도 미만인 상태이면 산화촉매(51)가 산화능에 도달되지 않는 것으로 판정하여 상기 S102의 과정으로 리턴되고, 냉각수의 온도가 기준온도를 초과한 상태이면 산화촉매(51)가 산화능에 도달한 것으로 판정한다(S104).If the temperature of the coolant is less than the reference temperature in the judgment of S103, the oxidation catalyst 51 determines that the oxidation capacity is not reached and returns to the process of S102. If the temperature of the coolant exceeds the reference temperature, the oxidation catalyst ( It is determined that 51) has reached the oxidation capability (S104).

이후, 학습을 통해 저장된 산화촉매(51)의 산화능력에 따라 산화촉매(51)의 한계온도를 설정하고(S105), 디젤매연필터(53)의 양단간에 설치되는 도시되지 않은 차압센서의 정보를 분석하여 디젤매연필터(53)의 재생조건을 만족하는지 판단하며, 재생조건이면 연료의 후분사를 통해 디젤매연필터(53)를 재생 시작한다(S106).Subsequently, the threshold temperature of the oxidation catalyst 51 is set according to the oxidation capacity of the oxidation catalyst 51 stored through the learning (S105), and information of the differential pressure sensor (not shown) installed between both ends of the diesel particulate filter 53 is obtained. The analysis determines whether the regeneration condition of the diesel particulate filter 53 is satisfied, and if the regeneration condition is satisfied, regeneration of the diesel particulate filter 53 is started through post injection of fuel (S106).

상기 디젤매연필터(53)를 재생시키는 과정에서 후분사량을 제어하며(S107), 엔진 RPM과 부하를 검출하여 엔진(10)에서 배출되는 배기가스의 온도, 즉 산화촉매(51)의 전단온도를 예측하고(S108) 산화촉매(51)의 후단부에 설치되는 열전대(52)를 통해 산화촉매(51)의 후단온도를 검출한다(S109).In the process of regenerating the diesel particulate filter 53 to control the after injection amount (S107), by detecting the engine RPM and load, the temperature of the exhaust gas discharged from the engine 10, that is, the shear temperature of the oxidation catalyst 51 It predicts (S108) and detects the rear end temperature of the oxidation catalyst 51 through the thermocouple 52 provided in the rear end of the oxidation catalyst 51 (S109).

그리고, 산화촉매(51) 양단간의 온도 차이를 계산하여 온도차가 설정된 기준온도(b℃)를 초과하는지 판단한다(S110).Then, the temperature difference between both ends of the oxidation catalyst 51 is calculated to determine whether the temperature difference exceeds the set reference temperature (b ° C.) (S110).

상기 S110의 판단에서 산화촉매(51) 양단간의 온도차가 기준온도(b℃) 미만이면 상기 S107의 과정으로 리턴되어 후분사량의 조정을 통해 디젤매연필터(53)의 재생을 지속한다.If the temperature difference between the both ends of the oxidation catalyst 51 in the judgment of S110 is less than the reference temperature (b ℃) is returned to the process of S107 to continue the regeneration of the diesel particulate filter 53 by adjusting the post injection amount.

그러나, 상기 S110의 판단에서 산화촉매(51) 양단간의 온도차가 기준온도(b℃)를 초과한 상태이면 과도한 후분사에 의해 발생되는 연소되지 않은 HC(탄화수 소)가 슬립하여 디젤매연필터(53)에 과도한 양, 예를 들어 300ppm 이상 유입되는 것으로 판정한다(S111).However, if the temperature difference between the both ends of the oxidation catalyst 51 exceeds the reference temperature (b ° C.) in the determination of S110, unburned HC (hydrocarbon) generated by excessive post injection is slipped and the diesel particulate filter ( 53, it is determined that an excessive amount, for example, 300 ppm or more flows in (S111).

상기 디젤매연필터(53)에 유입되는 HC(탄화수소) 양의 판정은 도 3에 도시된 바와 같이 디젤매연필터(53)의 재생조건에서 후분사량이 증가함에 따라 연소되지 않은 HC(탄화수소)의 농도가 증가됨을 알 수 있고, 또한 산화촉매(51) 전후단의 온도 차이도 증가됨을 알 수 있다.Determination of the amount of HC (hydrocarbon) flowing into the diesel particulate filter 53 is the concentration of HC (hydrocarbon) not burned as the after injection amount increases in the regeneration conditions of the diesel particulate filter 53, as shown in FIG. It can be seen that is increased, and also the temperature difference between the front and rear of the oxidation catalyst 51 is also increased.

따라서, 산화촉매(51) 전후단의 온도 차이를 알면 디젤매연필터(53)의 재생시 산화촉매(51)에서 슬립되어 유입되는 연소되지 않은 HC(탄화수소)의 양을 알 수 있다.Therefore, if the temperature difference between the front and rear ends of the oxidation catalyst 51 is known, the amount of unburned HC (hydrocarbon) which slips in the oxidation catalyst 51 and flows in during the regeneration of the diesel particulate filter 53 can be known.

상기와 같이 과도한 후분사에 의해 산화촉매(51)에서 슬립되는 연소되지 않는 HC(탄화수소)가 디젤매연필터(53)에 유입되는 것이 판정되면, 유입되는 HC(탄화수소)에 의한 발열 반응으로 디젤매연필터(53)의 온도를 과도하게 상승시키는 조건으로 판정하여 후분사를 정지시킨다(S112).When it is determined that the non-combustion HC (hydrocarbon) slipped in the oxidation catalyst 51 due to excessive after-injection flows into the diesel particulate filter 53 as described above, the diesel smoke is exothermic by the HC (hydrocarbon) flowing in. It is determined on the condition of excessively raising the temperature of the filter 53 and the post-injection is stopped (S112).

즉, 디젤매연필터(53)의 재생 동작을 중지시켜 디젤매연필터(53)가 소손되는 것을 방지한다.That is, the regeneration operation of the diesel particulate filter 53 is stopped to prevent the diesel particulate filter 53 from being burned out.

또한, 차량은 엔진 온 타임과 마일리지의 증가에 따라 산화촉매(51)가 에이징되며 이에 따라 산화능력의 저하가 발생되므로, 디젤매연필터(53)의 재생 동작이 실행되지 이전에 산화촉매(51)의 산화능력이 규정되어야 한다.In addition, since the oxidation catalyst 51 is aged according to the increase in engine on time and mileage, and the oxidation capacity decreases accordingly, the oxidation catalyst 51 before the regeneration operation of the diesel particulate filter 53 is not performed. The oxidation capacity of

그리고, 산화촉매(51)의 산화능력에 따라 연소되지 않은 HC(탄화수소)가 슬립되는 한계온도가 결정된다. The threshold temperature at which the unburned HC (hydrocarbon) slips is determined according to the oxidation capacity of the oxidation catalyst 51.

따라서, 제어부(100)는 엔진 온 타임과 마일리지의 증가에 따라 설정된 학습조건을 만족하면 산화촉매(51) 전단의 온도를 설정된 일정온도로 일정시간 동안 유지시키고(S113), 열전대(52)를 통해 산화촉매(51) 후단의 온도를 설정된 일정시간 동안 검출하여 평균온도를 계산한다(S114).Therefore, the controller 100 maintains the temperature of the front end of the oxidation catalyst 51 for a predetermined time for a predetermined time when the learning condition is satisfied according to the increase in the engine on time and the mileage (S113), and through the thermocouple 52. The temperature of the rear end of the oxidation catalyst 51 is detected for a predetermined time and the average temperature is calculated (S114).

이후, 산화촉매(51) 전후단의 온도차이를 계산하여 산화촉매(51)의 산화능력을 하기의 수학식 1을 적용하여 학습 저장하고(S115), 학습된 산화능력에 따라 한계온도를 수정하여 디젤매연필터(53)의 다음 재생에 적용되도록 한다(S116).Thereafter, by calculating the temperature difference between the front and rear ends of the oxidation catalyst 51, the oxidation capacity of the oxidation catalyst 51 is learned and stored by applying Equation 1 below (S115), and the limit temperature is corrected according to the learned oxidation capacity. It is to be applied to the next regeneration of the diesel particulate filter 53 (S116).

Figure 112009053894899-pat00001
Figure 112009053894899-pat00001

상기의 계산 결과값이 '1'이면 정상적인 산화촉매로 판정하고, 계산 결과값이 '0.5'이면 에이징이 발생된 산화촉매로 판정하며, 계산 결과값이 '0'이면 산화촉매의 고장으로 판정한다.If the calculation result value is '1', it is determined to be a normal oxidation catalyst. If the calculation result value is '0.5', it is determined to be an oxidation catalyst that has aged. If the calculation result value is '0', it is determined to be a failure of the oxidation catalyst. .

또한, 상기의 기술을 적용하여 디젤매연필터(53)의 재생이 진행되는 상태에서 발화성이 큰 엔진오일 등의 이물질이 디젤매연필터(53)에 유입되는 경우에도 후분사를 금지시켜 디젤매연필터(53)의 재생 동작을 중지시킴으로써, 디젤매연필터의 보호 및 차량 보호를 제공하여 운행에 신뢰성을 제공한다. In addition, even after the regeneration of the diesel particulate filter 53 is applied by applying the above technique, even when foreign substances such as engine oil having a high ignition property enter the diesel particulate filter 53, the after-injection is prohibited to prevent the diesel particulate filter ( By stopping the regeneration operation of 53, it provides protection of the diesel particulate filter and vehicle protection, thereby providing reliability in operation.

이상에서 본 발명의 실시예에 대하여 상세하게 설명하였지만 본 발명의 권리범위는 이에 한정되는 것이 아니고 다음의 청구범위에서 정의하고 있는 본 발명의 기본 개념을 이용한 당업자의 여러 변형 및 개량 형태 또한 본 발명의 권리범위에 포함된다.Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It is included in the scope of rights.

도 1은 본 발명의 실시예에 따른 디젤차량의 후처리계 보호장치를 개략적으로 도시한 도면이다.1 is a view schematically showing a post-treatment system protection apparatus for a diesel vehicle according to an embodiment of the present invention.

도 2는 본 발명의 실시예에 따른 디젤차량에서 후처리계 보호 절차를 도시한 흐름도이다.2 is a flowchart illustrating a post-processing system protection procedure in a diesel vehicle according to an embodiment of the present invention.

도 3은 본 발명의 실시예에 따른 디젤차량에서 산화촉매 전후단의 온도차와 HC(탄화수소)의 농도를 도시한 그래프이다.3 is a graph showing the temperature difference and the concentration of HC (hydrocarbon) before and after the oxidation catalyst in a diesel vehicle according to an embodiment of the present invention.

도 4는 디젤차량에서 산화촉매 후단의 HC(탄화수소) 농도와 디젤매연필터의 온도를 도시한 그래프이다.4 is a graph showing the HC (hydrocarbon) concentration and the temperature of the diesel particulate filter after the oxidation catalyst in a diesel vehicle.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

10 : 엔진 30 ; 터보차저10: engine 30; Turbocharger

50 : 촉매 51 : 산화촉매50 catalyst 51 oxidation catalyst

52 : 열전대 53 : 디젤매연필터52: thermocouple 53: diesel particulate filter

Claims (10)

엔진의 배기 매니폴더에 장착되어 배기가스에 포함된 탄화수소를 산화 반응시켜 정화하는 산화촉매; 상기 산화촉매의 하류측에 설치되어 그을음을 포함하는 입자상 물질을 포집하는 디젤매연필터; 상기 산화촉매의 후단에 설치되어, 산화촉매 후단의 온도를 측정하는 열전대; 상기 디젤매연필터의 재생시 엔진 RPM과 부하로부터 산화촉매의 전단온도를 산출하고, 상기 산화촉매의 전후단 온도차를 계산하여 설정된 기준온도 이상이면 후분사를 금지하여 디젤매연필터의 재생을 중지시키는 제어부를 포함하는 디젤차량의 후처리계 보호장치에 있어서,An oxidation catalyst mounted on an exhaust manifold of the engine to oxidize and purify hydrocarbons contained in exhaust gas; A diesel particulate filter disposed downstream of the oxidation catalyst to collect particulate matter including soot; A thermocouple installed at a rear end of the oxidation catalyst to measure a temperature of the rear end of the oxidation catalyst; The control unit calculates the shear temperature of the oxidation catalyst from the engine RPM and the load during regeneration of the diesel particulate filter, calculates the temperature difference between the front and rear ends of the oxidation catalyst, and stops the regeneration of the diesel particulate filter by prohibiting post injection if the reference temperature is higher than the set reference temperature. In the after-treatment system protection device of a diesel vehicle comprising: 상기 제어부는 산화촉매의 전후단 온도 모니터링을 위해 냉각수온의 정보를 판독하여 산화촉매의 산화능을 판정하며, 산화능에 도달된 경우에 한하여 디젤매연필터의 재생을 실행하고,The control unit reads the information of the cooling water temperature for monitoring the temperature before and after the oxidation catalyst to determine the oxidation capacity of the oxidation catalyst, and only when the oxidation capacity is reached, regenerating the diesel particulate filter, 산화촉매의 전후단 온도차에 따라 디젤매연필터에 유입되는 미연소 탄화수소의 양을 산출하여 기준량 이상이면 후분사를 금지하여 디젤매연필터의 재생을 중지시키는 것을 특징으로 하는 디젤차량의 후처리계 보호장치. The after-treatment system protection device for diesel vehicles, characterized in that the amount of unburned hydrocarbons flowing into the diesel particulate filter is calculated according to the temperature difference between the front and rear ends of the oxidation catalyst, and if the amount exceeds the reference amount, the after-injection is prohibited to stop the regeneration of the diesel particulate filter. . 삭제delete 삭제delete 제1항에 있어서,The method of claim 1, 상기 제어부는 산화촉매의 산화능력을 기준으로 미연소 탄화수소의 슬립이 발생되는 한계온도를 설정하는 디젤차량의 후처리계 보호장치. The control unit protects the after-treatment system of the diesel vehicle for setting the threshold temperature at which the unburned hydrocarbon slip occurs based on the oxidation capacity of the oxidation catalyst. 제1항에 있어서,The method of claim 1, 상기 제어부는 엔진 시동 온 타임 및 마일리지의 증가에 따라 산화촉매의 산화능력을 학습 저장하고, 학습된 산화능력에 따라 디젤매연필터의 다음 재생시에 한계온도를 적용하는 디젤차량의 후처리계 보호장치.The control unit learns and stores the oxidation capacity of the oxidation catalyst according to the engine start-on time and mileage increase, and applies a limit temperature at the next regeneration of the diesel particulate filter according to the learned oxidation capacity. 엔진이 시동 온 되면 제반 운전정보를 검출 분석하여 산화촉매의 산화능 조건을 만족하는지 판정하는 과정;Detecting and analyzing all operation information when the engine is started and determining whether an oxidation capability condition of the oxidation catalyst is satisfied; 상기 산화촉매의 산화능 조건을 만족하면 상기 산화촉매가 미연소 탄화수소의 슬립을 발생시키는 한계온도를 설정하는 과정;Setting a threshold temperature at which the oxidation catalyst generates slips of unburned hydrocarbons when the oxidation performance condition of the oxidation catalyst is satisfied; 디젤매연필터의 양단간 차압이 재생 조건을 만족하는지 판단하여 재생 조건이면 후분사 제어를 통해 재생을 실행하는 과정;Determining whether the differential pressure between the two ends of the diesel particulate filter satisfies the regeneration condition and performing regeneration through post injection control if the regeneration condition is satisfied; 디젤매연필터의 재생 과정에서 산화촉매 양단간의 온도를 검출하여 온도차가 설정된 기준온도를 초과하였는지 판단하는 과정;Determining whether a temperature difference exceeds a predetermined reference temperature by detecting a temperature between both ends of the oxidation catalyst in a regeneration process of the diesel particulate filter; 상기 산화촉매 양단간의 온도차가 설정된 기준온도를 초과하였으면 디젤매연필터에 미연소된 탄화수소가 과도하게 유입되는 것으로 판정하여 후분사를 금지시켜 디젤매연필터의 재생 동작을 중지하는 과정;Stopping the regeneration of the diesel particulate filter by determining that the unburned hydrocarbon is excessively introduced into the diesel particulate filter if the temperature difference between the both ends of the oxidation catalyst exceeds the set reference temperature; 을 포함하는 디젤차량의 후처리계 보호방법.After treatment system protection method of a diesel vehicle comprising a. 제6항에 있어서,The method of claim 6, 엔진 시동 온 타임 및 마일리지의 증가에 따라 산화촉매의 산화능력을 학습 저장하고, 학습된 산화능력에 따라 디젤매연필터의 다음 재생시에 한계온도를 적용하는 과정;Learning and storing the oxidation capacity of the oxidation catalyst according to the engine start-on time and mileage increase, and applying a limit temperature at the next regeneration of the diesel particulate filter according to the learned oxidation capacity; 을 더 포함하는 디젤차량의 후처리계 보호방법.After treatment system protection method of a diesel vehicle further comprising a. 제6항에 있어서,The method of claim 6, 상기 산화촉매의 산화능 조건의 판정은 냉각수온을 통해 실행하며, 냉각수온이 설정온도 이상 경우에 산화능 조건을 만족하는 것으로 판정하는 디젤차량의 후처리계 보호방법. Determination of the oxidation capacity condition of the oxidation catalyst is carried out through the cooling water temperature, and when the cooling water temperature is higher than the set temperature, it is determined that the after-treatment system of the diesel vehicle to satisfy the oxidation performance conditions. 제6항에 있어서,The method of claim 6, 상기 산화촉매 양단간의 온도 검출에서 상기 산화촉매 전단의 온도는 엔진 RPM과 부하의 조건을 적용하여 계산하고, 산화촉매 후단의 온도는 산화촉매 후단에 설치된 열전대를 이용하여 측정하는 디젤차량의 후처리계 보호방법.In the temperature detection between the both ends of the oxidation catalyst, the temperature of the front end of the oxidation catalyst is calculated by applying the conditions of the engine RPM and the load, and the temperature of the rear end of the oxidation catalyst is measured using a thermocouple installed at the rear end of the oxidation catalyst. How to protect. 제6항에 있어서,The method of claim 6, 상기 디젤매연필터의 재생 동작이 실행되는 상태에서 발화성이 큰 엔진오일이 디젤매연필터에 유입되는 경우 후분사 금지를 통해 디젤매연필터의 재생 동작을 중지시키는 것을 더 포함하는 디젤차량의 후처리계 보호방법.When the engine oil having a high ignition inflow into the diesel particulate filter in the state that the diesel particulate filter is regenerated, the after-treatment system protection of the diesel vehicle further comprises stopping the regeneration of the diesel particulate filter through post-injection inhibition. Way.
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