CN113090370B - Test method for confirming DPF balance point temperature of off-road diesel engine - Google Patents
Test method for confirming DPF balance point temperature of off-road diesel engine Download PDFInfo
- Publication number
- CN113090370B CN113090370B CN202110336703.1A CN202110336703A CN113090370B CN 113090370 B CN113090370 B CN 113090370B CN 202110336703 A CN202110336703 A CN 202110336703A CN 113090370 B CN113090370 B CN 113090370B
- Authority
- CN
- China
- Prior art keywords
- dpf
- test
- temperature
- engine
- balance point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 17
- 230000008929 regeneration Effects 0.000 claims abstract description 10
- 238000011069 regeneration method Methods 0.000 claims abstract description 10
- 238000009825 accumulation Methods 0.000 claims abstract description 9
- 238000011056 performance test Methods 0.000 claims abstract description 8
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 6
- 230000004913 activation Effects 0.000 claims abstract description 4
- 230000003213 activating effect Effects 0.000 claims abstract 2
- 239000013618 particulate matter Substances 0.000 claims description 5
- 230000001052 transient effect Effects 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 claims description 3
- 231100000719 pollutant Toxicity 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a test method for confirming the temperature of a DPF balance point of an off-road diesel engine, which comprises the steps of firstly carrying out performance test on an engine source row before the test, then activating an additionally arranged post-processor, carrying out engine performance test after the activation to obtain the result of the trapping efficiency of the DPF particulate matters, carrying out test and carbon accumulation test on the oxidation efficiency of a DOC, carrying out the temperature test of the balance point after the carbon accumulation is finished, and finally measuring the temperature of the balance point. The method has the advantages of being capable of being matched with a proper DPF, effectively improving the passive regeneration capacity, prolonging the regeneration period and improving the competitiveness of the off-road diesel engine.
Description
Technical Field
The invention relates to the field of engines, in particular to a test method for confirming the DPF balance point temperature of an off-road diesel engine.
Background
DPF (Diesel Particulate Filter) particulate matter trap is installed in the exhaust system of diesel engine mobile machinery, and the main mode of trapping particles by a surface and internal mixed filter device is shown in fig. 1, and DPF carrier can effectively reduce more than 85% of particulate matters in tail gas, and is one of the most effective methods for meeting increasingly strict regulations of current road and off-road diesel engines.
Although the DPF can effectively trap particulate matters and improve the emission of a diesel engine, as the service time increases, the particulate matters can continuously accumulate in the DPF to cause excessive back pressure of an exhaust system, and the dynamic property and the fuel economy can be affected in serious cases. In order to ensure that the DPF can reach the previous state, the DPF is required to be regenerated, and the main principle of regeneration is that conditions such as oxidation of particulate matters, temperature, oxygen concentration and oxidation time are influenced. The key point of DPF regeneration is to reduce the temperature at the equilibrium point, at which the particulate generation and oxidation rates are the same, and at which the exhaust system backpressure is constant, the temperature at the equilibrium point being related to parameters such as space velocity, particulate matter content, NOx content in the exhaust system.
The foregoing background is only for the purpose of providing an understanding of the inventive concepts and technical aspects of the present invention and is not necessarily prior art to the present application and is not intended to be used to evaluate the novelty and creativity of the present application in the event that no clear evidence indicates that such is already disclosed at the filing date of the present application.
Disclosure of Invention
The invention aims to provide a test method for confirming the DPF balance point temperature of an off-road diesel engine.
In order to achieve the above object, the present invention adopts the following technical scheme:
the test method for confirming the DPF balance point temperature of the off-road diesel engine is characterized by comprising the following steps of:
s1: and before the test, performing performance test on the engine source row to confirm whether the engine state is normal. NRSC (steady state) and NRTC (transient) emission cycle tests were then performed to confirm the original engine emission level of the engine, primarily for post-DPF loading capture efficiency calculations, and to confirm the average airspeed in the NRTC transient cycle.
S2: the added post-processor is activated first, the inlet temperature of the sample is required to be 425-475 ℃, and the airspeed is 30000-40000 h < -1 >, and the time is 3-4 h. After activation, an engine performance test is performed to determine whether the exhaust back pressure of the exhaust system is appropriate (DOC+DPF+SCR is less than or equal to 30kPa, DOC+DPF is less than or equal to 20 kPa). NRSC and NRTC emission cycle tests were performed to confirm that each emission pollutant can meet the regulatory requirements (CO, HC, NOx, PM, PN and ammonia slip, etc.), and to obtain the result of the particulate matter trapping efficiency of the DPF.
S3: the oxidation efficiency of DOC is tested, it is related to the temperature of balance point of DPF, mainly measuring CO, HC, NO and NO2, confirming the absolute value and the ratio of NO2 (maximum value reaches 45%) after DOC. And then carrying out a carbon accumulation test for more than 12-15 hours, wherein the target is 4.5g/L, and a round of parking regeneration test is carried out before the carbon accumulation test, so that carbon in the DPF is burnt out, and the uniform distribution of the carbon accumulation process is ensured.
S4: after finishing accumulating carbon, carrying out balance point temperature test, starting DPF inlet temperature from 240-260 ℃, raising inlet temperature at intervals of 20 ℃, stabilizing each temperature for 15min, and recording the inlet temperature of the sample when detecting that the pressure drop of the sample is obviously reduced during the stable working condition of the engine, namely, the balance point temperature. After the equilibrium point temperature is reached, the sample inlet temperature may be increased by a further 20 ℃ to confirm the equilibrium point temperature.
Compared with the prior art, the invention has the advantages that:
the test method is suitable for the off-road diesel engine, and particularly, under the condition that the emission result of the original exhaust particulate matters of the diesel engine is not very good, how to find the matched DOC and DPF scheme through balance point test, the DPF regeneration period length is improved, and the user experience is improved. The novel method is provided for the temperature test of the balance point of the DPF, and has the advantages of being capable of being matched with a proper DPF, effectively improving the passive regeneration capacity, prolonging the regeneration period and improving the competitiveness of the off-road diesel engine.
Drawings
FIG. 1 is a process diagram of a DPF balance point temperature test process of the present invention;
FIG. 2 is a graph of DPF inlet temperature versus pressure drop for the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments. It should be emphasized that the following description is merely exemplary in nature and is in no way intended to limit the scope of the invention or its applications.
As shown in fig. 1 and 2, the test method for confirming the temperature of the DPF balance point of the off-road diesel engine is characterized by comprising the following steps:
s1: and before the test, performing performance test on the engine source row to confirm whether the engine state is normal. NRSC (steady state) and NRTC (transient) emission cycle tests were then performed to confirm the original engine emission level of the engine, primarily for post-DPF loading capture efficiency calculations, and to confirm the average airspeed in the NRTC transient cycle.
S2: the added post-processor is activated first, the inlet temperature of the sample is required to be 425-475 ℃, and the airspeed is 30000-40000 h < -1 >, and the time is 3-4 h. After activation, an engine performance test is performed to determine whether the exhaust back pressure of the exhaust system is appropriate (DOC+DPF+SCR is less than or equal to 30kPa, DOC+DPF is less than or equal to 20 kPa). NRSC and NRTC emission cycle tests were performed to confirm that each emission pollutant can meet the regulatory requirements (CO, HC, NOx, PM, PN and ammonia slip, etc.), and to obtain the result of the particulate matter trapping efficiency of the DPF.
S3: the oxidation efficiency of DOC is tested, it is related to the temperature of balance point of DPF, mainly measuring CO, HC, NO and NO2, confirming the absolute value and the ratio of NO2 (maximum value reaches 45%) after DOC. And then carrying out a carbon accumulation test for more than 12-15 hours, wherein the target is 4.5g/L, and a round of parking regeneration test is carried out before the carbon accumulation test, so that carbon in the DPF is burnt out, and the uniform distribution of the carbon accumulation process is ensured.
S4: after finishing accumulating carbon, carrying out balance point temperature test, starting DPF inlet temperature from 240-260 ℃, raising inlet temperature at intervals of 20 ℃, stabilizing each temperature for 15min, and recording the inlet temperature of the sample when detecting that the pressure drop of the sample is obviously reduced during the stable working condition of the engine, namely, the balance point temperature. After the equilibrium point temperature is reached, the sample inlet temperature may be increased by a further 20 ℃ to confirm the equilibrium point temperature.
The foregoing is a further detailed description of the invention in connection with specific/preferred embodiments, and is not intended to limit the practice of the invention to such description. It will be apparent to those skilled in the art that several alternatives or modifications can be made to the described embodiments without departing from the spirit of the invention, and these alternatives or modifications should be considered to be within the scope of the invention.
Claims (1)
1. A test method for confirming the DPF balance point temperature of an off-road diesel engine comprises the following steps:
s1: before the test, performing performance test on the engine source row to confirm whether the engine state is normal; then NRSC and NRTC emission cycle tests are conducted to confirm that the original engine emission level of the engine is used for calculating the trapping efficiency after the DPF is installed, and to confirm the average airspeed in the NRTC transient cycle;
s2: firstly, activating an added post-processor, wherein the inlet temperature of a sample is required to be 425-475 ℃, and the airspeed is 30000-40000 h < -1 >, and the time is 3-4 h; after activation, performing an engine performance test to confirm whether the exhaust back pressure of the exhaust system is appropriate: DOC+DPF+SCR is less than or equal to 30kPa, DOC+DPF is less than or equal to 20kPa; carrying out NRSC and NRTC emission cycle tests to confirm that various emission pollutants can meet the requirements of regulations and obtain the result of the particulate matter trapping efficiency of the DPF;
s3: firstly, testing the oxidation efficiency of the DOC, and respectively measuring CO, HC, NO and NO2 according to the temperature of the balance point of the DPF at the back, and confirming the absolute value and the ratio of the NO2 after the DOC, wherein the maximum value reaches 45%; then carrying out a carbon accumulating test for more than 12-15 hours, wherein the target reaches 4.5g/L, and carrying out a round of parking regeneration test before the carbon accumulating test, so as to burn carbon in the DPF and ensure the uniform distribution of the carbon accumulating process;
s4: after finishing carbon accumulation, carrying out balance point temperature test, wherein the DPF inlet temperature is increased from 240-260 ℃, the inlet temperature is increased at intervals of 20 ℃, the stabilizing time of each temperature is 15min, and when the pressure drop of a sample is detected to be reduced during the stabilizing period of the working condition of an engine, the balance point temperature of the sample is recorded; after the equilibrium point temperature was reached, the sample inlet temperature was continuously increased by 20 ℃ to confirm the equilibrium point temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110336703.1A CN113090370B (en) | 2021-03-29 | 2021-03-29 | Test method for confirming DPF balance point temperature of off-road diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110336703.1A CN113090370B (en) | 2021-03-29 | 2021-03-29 | Test method for confirming DPF balance point temperature of off-road diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113090370A CN113090370A (en) | 2021-07-09 |
| CN113090370B true CN113090370B (en) | 2024-02-02 |
Family
ID=76671085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110336703.1A Active CN113090370B (en) | 2021-03-29 | 2021-03-29 | Test method for confirming DPF balance point temperature of off-road diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113090370B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114033532B (en) * | 2021-11-08 | 2022-12-30 | 凯龙高科技股份有限公司 | DPF active regeneration period determination method and device, electronic equipment and storage medium |
| CN114486272B (en) * | 2021-12-24 | 2023-09-15 | 广西玉柴机器股份有限公司 | Whole vehicle carbon accumulation test method of loader |
| CN114705443B (en) * | 2022-03-16 | 2023-09-05 | 中自环保科技股份有限公司 | Diesel particle catcher engine rack performance evaluation method |
| CN114964794B (en) * | 2022-05-09 | 2023-07-14 | 北京理工大学 | Method for rapidly evaluating balance point temperature in endurance process of cDPF device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007027182A1 (en) * | 2007-06-13 | 2008-12-18 | Robert Bosch Gmbh | Method for regenerating particle filter in exhaust system of internal combustion engine of vehicle, involves sending or receiving data in vehicle by using integrated communication unit of another vehicle |
| CN103711557A (en) * | 2013-12-27 | 2014-04-09 | 清华大学 | Testing method and device for balance temperature of particulate filter |
| CN107605583A (en) * | 2017-09-21 | 2018-01-19 | 北京汽车研究总院有限公司 | Diesel vehicle grain catcher tires out carbon amounts evaluation method |
| WO2018214861A1 (en) * | 2017-05-26 | 2018-11-29 | 凯龙高科技股份有限公司 | Burner dpf regeneration control and diagnostic device |
| CN109404107A (en) * | 2018-09-17 | 2019-03-01 | 广东工业大学 | Diesel particulate trap carbon carrying capacity evaluation method |
| CN109667642A (en) * | 2019-01-14 | 2019-04-23 | 江苏大学 | A kind of judgment method of diesel engine dpf regeneration |
| CN109973175A (en) * | 2019-03-20 | 2019-07-05 | 一汽解放汽车有限公司 | Temprature control method when diesel particulate trap regenerates |
| CN112147028A (en) * | 2020-09-23 | 2020-12-29 | 凯龙高科技股份有限公司 | Thermal shock test system and method for diesel engine DPF carrier limit carbon loading capacity |
-
2021
- 2021-03-29 CN CN202110336703.1A patent/CN113090370B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007027182A1 (en) * | 2007-06-13 | 2008-12-18 | Robert Bosch Gmbh | Method for regenerating particle filter in exhaust system of internal combustion engine of vehicle, involves sending or receiving data in vehicle by using integrated communication unit of another vehicle |
| CN103711557A (en) * | 2013-12-27 | 2014-04-09 | 清华大学 | Testing method and device for balance temperature of particulate filter |
| WO2018214861A1 (en) * | 2017-05-26 | 2018-11-29 | 凯龙高科技股份有限公司 | Burner dpf regeneration control and diagnostic device |
| CN107605583A (en) * | 2017-09-21 | 2018-01-19 | 北京汽车研究总院有限公司 | Diesel vehicle grain catcher tires out carbon amounts evaluation method |
| CN109404107A (en) * | 2018-09-17 | 2019-03-01 | 广东工业大学 | Diesel particulate trap carbon carrying capacity evaluation method |
| CN109667642A (en) * | 2019-01-14 | 2019-04-23 | 江苏大学 | A kind of judgment method of diesel engine dpf regeneration |
| CN109973175A (en) * | 2019-03-20 | 2019-07-05 | 一汽解放汽车有限公司 | Temprature control method when diesel particulate trap regenerates |
| CN112147028A (en) * | 2020-09-23 | 2020-12-29 | 凯龙高科技股份有限公司 | Thermal shock test system and method for diesel engine DPF carrier limit carbon loading capacity |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113090370A (en) | 2021-07-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113090370B (en) | Test method for confirming DPF balance point temperature of off-road diesel engine | |
| Richter et al. | Application of catalyzed gasoline particulate filters to GDI vehicles | |
| CN109667642B (en) | Method for judging DPF regeneration of diesel engine | |
| CN103615299B (en) | The method and system of design diesel engine post-processing system | |
| CN112324546B (en) | Fault detection method and fault detection equipment for engine SOF control system | |
| CN112147028A (en) | Thermal shock test system and method for diesel engine DPF carrier limit carbon loading capacity | |
| CN107435575B (en) | Method for regenerating diesel particulate filter | |
| CN114087058B (en) | Method and system for detecting DPF overload | |
| CN114893280B (en) | Estimation method of DPF carbon loading | |
| CN113027575A (en) | Control method and device for exhaust emission and engine thermal management system | |
| CN110594019B (en) | Method and device for detecting exhaust and air leakage of engine | |
| CN113047971B (en) | Method and device for preventing engine particle number from exceeding standard | |
| Toorisaka et al. | DPR developed for extremely low PM emissions in production commercial vehicles | |
| CN115324696B (en) | Smoke intensity control method and device and vehicle | |
| Miao et al. | Development of a gasoline particulate filter for China 6 (b) emission standards | |
| Hua et al. | Effect of ash on gasoline particulate filter using an accelerated ash loading method | |
| CN114508407A (en) | Method and device for determining DPF removal | |
| Sugino et al. | Development of meshwork DPF catalyst for fuel economy improvement | |
| Matsumoto et al. | Advanced emission control technologies for PM reduction in heavy-duty applications | |
| CN114486270B (en) | Method, device, vehicle and medium for detecting uniformity of multiple DOCs | |
| Li et al. | Durability performance of advanced ceramic material DPFs | |
| CN116625697B (en) | Method and device for measuring accumulated carbon of diesel engine, electronic equipment and storage medium | |
| CN115013129B (en) | Control strategy for preventing PN (Positive and negative) emissions of tail gas of diesel engine from exceeding standard | |
| KR102451899B1 (en) | Exhaust gas post processing system and control method thereof | |
| CN114838944A (en) | Non-road diesel engine post-treatment rapid dust deposition test method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |