CN113090370A - Test method for confirming temperature of DPF balance point of non-road diesel engine - Google Patents
Test method for confirming temperature of DPF balance point of non-road diesel engine Download PDFInfo
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- CN113090370A CN113090370A CN202110336703.1A CN202110336703A CN113090370A CN 113090370 A CN113090370 A CN 113090370A CN 202110336703 A CN202110336703 A CN 202110336703A CN 113090370 A CN113090370 A CN 113090370A
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- 238000010998 test method Methods 0.000 title claims abstract description 9
- 238000012360 testing method Methods 0.000 claims abstract description 28
- 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
- 238000009825 accumulation Methods 0.000 claims abstract description 14
- 230000008929 regeneration Effects 0.000 claims abstract description 10
- 238000011069 regeneration method Methods 0.000 claims abstract description 10
- 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
- 239000013618 particulate matter Substances 0.000 claims abstract description 7
- 230000003213 activating effect Effects 0.000 claims abstract description 4
- 230000004913 activation Effects 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 3
- 231100000719 pollutant Toxicity 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 6
- 239000002245 particle Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration 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
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Classifications
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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
- 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
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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)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a test method for confirming temperature of a balance point of a DPF of a non-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 postprocessor, carrying out the performance test on the engine after the activation to obtain a result of the particulate matter trapping efficiency of the DPF, carrying out the test on the oxidation efficiency of a DOC and a carbon accumulation test, 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 matching with a proper DPF, effectively improving passive regeneration capacity, prolonging regeneration period and improving competitiveness of the non-road diesel engine.
Description
Technical Field
The invention relates to the field of engines, in particular to a test method for confirming the temperature of a DPF balance point of a non-road diesel engine.
Background
The DPF (diesel Particulate filter) is installed in an exhaust system of a diesel engine mobile machine, particles are trapped by a surface and internal mixed filtering device, the main mode of trapping the particles by a DPF carrier is shown in figure 1, the DPF can effectively reduce more than 85% of the particles in exhaust gas, and the DPF is one of the most effective methods for meeting more and more strict regulations of road and non-road diesel engines at present.
The DPF can effectively trap particulate matters and improve the emission of the diesel engine, but as the service life of the DPF increases, the particulate matters are continuously accumulated inside the DPF to cause overhigh back pressure of an exhaust system, and the dynamic property and the fuel economy are seriously influenced. In order to ensure that the DPF can reach the previous state, the DPF needs to be regenerated, and the main principle of regeneration is oxidation of particulate matter, and conditions such as temperature, oxygen concentration and oxidation time are influenced. The key point for DPF regeneration is to reduce the equilibrium point temperature, at which the rate of particulate matter formation and oxidation is the same, at which point the exhaust system backpressure is constant, which is related to parameters such as space velocity, particulate matter composition, NOx content, etc. in the exhaust system.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
The invention aims to provide a test method for confirming the temperature of a DPF balance point of an off-road diesel engine.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a test method for confirming temperature of DPF balance point of off-road diesel engine is characterized by comprising the following steps:
s1: before the test, the performance test is carried out on the engine source bank to confirm whether the engine state is normal. NRSC (steady state) and NRTC (transient) emissions cycle tests were then performed to confirm the engine's original emissions level, primarily for trapping efficiency calculations after loading the DPF, and to confirm the average airspeed in the NRTC transient cycle.
S2: activating the additionally-installed postprocessor, wherein the inlet temperature of the sample piece is required to be 425-475 ℃, the airspeed is 30000-40000 h < -1 >, and the time is 3-4 h. And (3) after activation, carrying out engine performance test to confirm whether the exhaust back pressure of the exhaust system is proper (DOC + DPF + SCR is less than or equal to 30kPa, and 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 satisfy the regulatory requirements (CO, HC, NOx, PM, PN, and ammonia slip, etc.), and the results of the particulate matter trapping efficiency of the DPF were obtained.
S3: the oxidation efficiency of DOC is tested, which is related to the temperature of the balance point of the following DPF, and mainly measures CO, HC, NO and NO2 respectively, and confirms the absolute value and the occupation ratio (the maximum value reaches 45%) of NO2 after DOC. And then performing carbon accumulation test for more than 12-15 h, wherein the target reaches 4.5g/L, and performing one parking regeneration test before the carbon accumulation test to burn off carbon in the DPF so as to ensure the uniform distribution of the carbon accumulation process.
S4: after carbon accumulation is finished, balance point temperature testing is carried out, the DPF inlet temperature is started from 240-260 ℃, the inlet temperature is increased at intervals of 20 ℃, the stabilization time of each temperature is 15min, and when the pressure drop of a detected sample is obviously reduced during the stable working condition of an engine, the inlet temperature of the sample is recorded, namely the balance point temperature. After the equilibrium point temperature is reached, the sample inlet temperature may be increased by a further 20 ℃ in order to confirm the equilibrium point temperature.
Compared with the prior art, the invention has the advantages and beneficial effects that:
the test method is suitable for non-road diesel engines, and especially under the condition that the original emission result of the particulate matters of the diesel engine is not good, how to find out the matched DOC and DPF scheme through balance point test improves the regeneration cycle length of the DPF and improves the user experience. A new method is provided for testing the temperature of the DPF balance point, and the method has the advantages of being capable of matching with a proper DPF, effectively improving passive regeneration capacity, prolonging regeneration period and improving competitiveness of a non-road diesel engine.
Drawings
FIG. 1 is a process diagram of a DPF equilibrium point temperature test process of the present invention;
FIG. 2 is a graph of DPF inlet temperature and pressure drop according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
As shown in fig. 1 and 2, the test method for confirming the temperature of the off-road diesel engine DPF equilibrium point is characterized by comprising the following steps:
s1: before the test, the performance test is carried out on the engine source bank to confirm whether the engine state is normal. NRSC (steady state) and NRTC (transient) emissions cycle tests were then performed to confirm the engine's original emissions level, primarily for trapping efficiency calculations after loading the DPF, and to confirm the average airspeed in the NRTC transient cycle.
S2: activating the additionally-installed postprocessor, wherein the inlet temperature of the sample piece is required to be 425-475 ℃, the airspeed is 30000-40000 h < -1 >, and the time is 3-4 h. And (3) after activation, carrying out engine performance test to confirm whether the exhaust back pressure of the exhaust system is proper (DOC + DPF + SCR is less than or equal to 30kPa, and 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 satisfy the regulatory requirements (CO, HC, NOx, PM, PN, and ammonia slip, etc.), and the results of the particulate matter trapping efficiency of the DPF were obtained.
S3: the oxidation efficiency of DOC is tested, which is related to the temperature of the balance point of the following DPF, and mainly measures CO, HC, NO and NO2 respectively, and confirms the absolute value and the occupation ratio (the maximum value reaches 45%) of NO2 after DOC. And then performing carbon accumulation test for more than 12-15 h, wherein the target reaches 4.5g/L, and performing one parking regeneration test before the carbon accumulation test to burn off carbon in the DPF so as to ensure the uniform distribution of the carbon accumulation process.
S4: after carbon accumulation is finished, balance point temperature testing is carried out, the DPF inlet temperature is started from 240-260 ℃, the inlet temperature is increased at intervals of 20 ℃, the stabilization time of each temperature is 15min, and when the pressure drop of a detected sample is obviously reduced during the stable working condition of an engine, the inlet temperature of the sample is recorded, namely the balance point temperature. After the equilibrium point temperature is reached, the sample inlet temperature may be increased by a further 20 ℃ in order to confirm the equilibrium point temperature.
The foregoing is a more detailed description of the invention in connection with specific/preferred embodiments and is not intended to limit the practice of the invention to those descriptions. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and such substitutions and modifications are to be considered as within the scope of the invention.
Claims (1)
1. A test method for confirming temperature of DPF balance point of off-road diesel engine is characterized by comprising the following steps:
s1: before the test, the performance test is carried out on the engine source bank to confirm whether the engine state is normal. NRSC (steady state) and NRTC (transient) emissions cycle tests were then performed to confirm the engine's original emissions level, primarily for trapping efficiency calculations after loading the DPF, and to confirm the average airspeed in the NRTC transient cycle.
S2: activating the additionally-installed postprocessor, wherein the inlet temperature of the sample piece is required to be 425-475 ℃, the airspeed is 30000-40000 h < -1 >, and the time is 3-4 h. And (3) after activation, carrying out engine performance test to confirm whether the exhaust back pressure of the exhaust system is proper (DOC + DPF + SCR is less than or equal to 30kPa, and 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 satisfy the regulatory requirements (CO, HC, NOx, PM, PN, and ammonia slip, etc.), and the results of the particulate matter trapping efficiency of the DPF were obtained.
S3: the oxidation efficiency of DOC is tested, which is related to the temperature of the balance point of the following DPF, and mainly measures CO, HC, NO and NO2 respectively, and confirms the absolute value and the occupation ratio (the maximum value reaches 45%) of NO2 after DOC. And then performing carbon accumulation test for more than 12-15 h, wherein the target reaches 4.5g/L, and performing one parking regeneration test before the carbon accumulation test to burn off carbon in the DPF so as to ensure the uniform distribution of the carbon accumulation process.
S4: after carbon accumulation is finished, balance point temperature testing is carried out, the DPF inlet temperature is started from 240-260 ℃, the inlet temperature is increased at intervals of 20 ℃, the stabilization time of each temperature is 15min, and when the pressure drop of a detected sample is obviously reduced during the stable working condition of an engine, the inlet temperature of the sample is recorded, namely the balance point temperature. After the equilibrium point temperature is reached, the sample inlet temperature may be increased by a further 20 ℃ in order to confirm the equilibrium point temperature.
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| CN202110336703.1A CN113090370B (en) | 2021-03-29 | 2021-03-29 | Test method for confirming DPF balance point temperature of off-road diesel engine |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114033532A (en) * | 2021-11-08 | 2022-02-11 | 凯龙高科技股份有限公司 | DPF active regeneration period determination method and device, electronic equipment and storage medium |
| CN114486272A (en) * | 2021-12-24 | 2022-05-13 | 广西玉柴机器股份有限公司 | Carbon accumulation test method for whole loader |
| CN114705443A (en) * | 2022-03-16 | 2022-07-05 | 中自环保科技股份有限公司 | Diesel particulate filter engine pedestal performance evaluation method |
| CN114964794A (en) * | 2022-05-09 | 2022-08-30 | 北京理工大学 | Method for rapidly evaluating temperature of balance point in durability process of cDPF device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114486272A (en) * | 2021-12-24 | 2022-05-13 | 广西玉柴机器股份有限公司 | Carbon accumulation test method for whole loader |
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| 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 |
| CN114964794A (en) * | 2022-05-09 | 2022-08-30 | 北京理工大学 | Method for rapidly evaluating temperature of balance point in durability process of cDPF device |
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| CN113090370B (en) | 2024-02-02 |
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