CN103615299B - The method and system of design diesel engine post-processing system - Google Patents
The method and system of design diesel engine post-processing system Download PDFInfo
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Abstract
The invention provides a kind of method and system designing diesel engine post-processing system.First when diesel engine is without any after-treatment system, record diesel engine condition tests each NO under different oil spout combination
x, THC, CO, PM discharge and BSFC value, to determine optimum timing and rail pressure parameter, then determine optimum fuel injection parameter based on first principle of optimality; Design multiple DOC+CDPF catalyst converter sample structure based on extraction flow and delivery temperature mapping characteristics simultaneously, to prepare corresponding catalyst converter, after the catalyst converter of preparation is installed at diesel engine subsequently, record the PM conversion ratio of corresponding catalyst converter, back pressure and cost, the relevant information of optimum catalyst converter is determined again, to prepare optimum catalyst converter based on second principle of optimality; Finally, after optimum catalyst converter installed by the diesel engine optimizing oil-fired system, the NO of record SCR
xconversion ratio and urea leakage rate, then determine optimum urea injecting quantity based on the 3rd principle of optimality, design after-treatment system thus.
Description
Technical field
The present invention relates to diesel engine post-processing system, particularly relate to a kind of method and system designing diesel engine post-processing system.
Background technique
Diesel engine has the features such as power is large, economic performance is good.But the NO of diesel engine
xand granular material discharged general higher, for this reason, various discharge treating system also arises at the historic moment.
Such as, be in the Chinese patent literature of 200880120587.2 at application number, disclose a kind of discharge treating system, it arranges diesel oxidation catalyst by the engine downstream position in waste gas streams path, reduces the nitrogen oxide in diesel exhaust stream, particulate matter and gaseous hydrocarbon etc.
Again such as, be in the Chinese patent literature of 201110208045.4 at application number, disclose a kind of exhaust gas aftertreatment system, its motor discharge exhausting air path on discharge pipe line is set, and arrange on this discharge pipe line gasoline particles filter to discharge gas process.
But following emission standard is to NO
xvery harsh with the emission request of particulate matter, only emission controls by improving combustion is difficult to reach standard, need by adjusting fuel oil strategy and adopting selective catalytic reduction (Selective Catalytic Reduction, SCR) urea-spray technology to reduce exhaust NO
x, and trap (coated Diesel Particulate Filter, CDPF) by diesel oxidation (Diesel Oxidation Catalyst, DOC)+have coating granule and effectively remove particulate matter in tail gas.
Wherein, SCR principle is mixed with proper proportion (concentration is generally 32.5%) with water by urea, sprays in the waste gas of diesel engine discharge.Under catalyst action, as the urea of reducing agent at 230 ~ 500 DEG C by the NO in waste gas
xbe reduced into harmless N
2and H
2o, thus can by the NO in diesel engine vent gas
xreduce more than 50%.DOC has good effect to the soluble organic fraction removed in diesel particle, and soluble organic fraction under the effect of noble metal catalyst, oxidation reaction occurs and is converted into CO
2and H
2o and removing.CDPF is coated catalysts on grain catcher DPF carrier, utilizes catalyzer to reduce the priming reaction energy of particulate, makes particulate can reach passive regeneration at diesel engine operating conditions in a big way.
Although DOC+CDPF has very high particle collection efficiency, how to reduce NO further
xconcentration is main difficulty.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of method and system designing diesel engine post-processing system, for solving Design of High Pressure Common Rail Diesel Engine NO
xthere is the problem that " trade-off " relation exceeds emission standard in discharge and particulate matter quantity.
For achieving the above object and other relevant objects, the invention provides a kind of method designing diesel engine post-processing system, it at least comprises:
Diesel engine without any after-treatment system when, each NO in each ESC working condition tests that record diesel engine carries out based on different timing and rail pressure parameter
x, THC, CO, PM discharge and BSFC value, to determine optimum timing and rail pressure parameter;
The optimum fuel injection parameter of diesel engine is determined based on first principle of optimality, described optimum timing and rail pressure parameter;
Multiple DOC+CDPF catalyst converter sample structure is designed, to prepare corresponding DOC+CDPF catalyst converter based on extraction flow and delivery temperature mapping characteristics;
When diesel engine is provided with prepared each DOC+CDPF catalyst converter, when record diesel engine carries out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, the PM degree of conversion alpha of corresponding DOC+CDPF catalyst converter
pM, back pressure P
b, and cost;
Based on second principle of optimality, the PM degree of conversion alpha of each DOC+CDPF catalyst converter that records
pM, back pressure P
b, and cost, determine the relevant information of optimum DOC+CDPF catalyst converter;
When diesel engine is provided with optimum DOC+CDPF catalyst converter, the NOX conversion ratio of each ESC working condition tests that record diesel engine carries out based on each urea injecting quantity and urea leakage rate;
Based on the 3rd principle of optimality, the urea injecting quantity recorded, NO
xconversion ratio and urea leakage rate determine optimum urea injecting quantity, design the after-treatment system of diesel engine thus.
Preferably, first principle of optimality comprises: the minimum and oil consumption concentration of the NOx concentration after Turbochargers in Diesel Engines, particle concentration, THC concentration, CO concentration, BSFC are limited in respective prespecified range respectively; More preferably, the prespecified range of oil consumption concentration is less than 102% of diesel engine reset condition; Particle concentration, THC concentration, CO concentration prespecified range are separately respectively less than 95% of diesel engine reset condition separately; BSFC is less than 102% of diesel engine reset condition.
Preferably, second principle of optimality comprises: DOC+CDPF catalyst converter cost minimization, PM degree of conversion alpha after the process of DOC+CDPF catalyst converter
pMthe second predetermined threshold is less than higher than the first predetermined threshold, back pressure.
Preferably, the 3rd principle of optimality comprises: the NO after SCR catalytic treatment
xconversion ratio
maximum, urea leakage rate
be less than the 3rd predetermined threshold.
The present invention also provides a kind of design system designing diesel engine post-processing system, and it at least comprises:
Logging modle, for diesel engine without any after-treatment system when, each NO in each ESC working condition tests that record diesel engine carries out based on different timing and rail pressure parameter
x, THC, CO, PM discharge and BSFC value, when diesel engine is provided with prepared each DOC+CDPF catalyst converter, when record diesel engine carries out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, the PM degree of conversion alpha of corresponding DOC+CDPF catalyst converter
pM, back pressure P
b, and cost, when diesel engine is provided with optimum DOC+CDPF catalyst converter, the NO of each ESC working condition tests that record diesel engine carries out based on each urea injecting quantity
xconversion ratio and urea leakage rate;
Design module, for designing multiple DOC+CDPF catalyst converter sample structure based on extraction flow and delivery temperature mapping characteristics, to prepare corresponding DOC+CDPF catalyst converter;
Optimize module, for determine based on first principle of optimality, described optimum timing and rail pressure parameter diesel engine optimum fuel injection parameter, based on second principle of optimality, the PM degree of conversion alpha of each DOC+CDPF catalyst converter sample that records
pM, back pressure P
b, and cost, determine the relevant information of optimum DOC+CDPF catalyst converter, based on the 3rd principle of optimality, the urea injecting quantity recorded, NO
xconversion ratio and urea leakage rate determine optimum urea injecting quantity.
Preferably, described logging modle builds based on diesel engine test stand.
Preferably, described determination module builds based on the design of experiment software of diesel engine.
Preferably, described optimization module builds based on the Optimization Software of diesel engine.
As mentioned above, the method and system of design diesel engine post-processing system of the present invention, have following beneficial effect: based on optimization fuel oil injection strategy and SCR control strategy, in conjunction with DOC+CDPF type selecting and design, and design forming one is to meet standard NO
xnH_3 leakage and particulate matter quantity, mass concentration for primary goal, are limited to the after-treatment system in critical field by discharge simultaneously.
Accompanying drawing explanation
Fig. 1 is shown as the design system schematic diagram of design diesel engine post-processing system of the present invention.
Fig. 2 is shown as the flow chart of the design method of design diesel engine post-processing system of the present invention.
Element numbers explanation
1 design system
11 logging modles
12 design modules
13 optimize module
S1 ~ S7 step
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this specification can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
Refer to Fig. 1 to Fig. 2.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present invention in a schematic way, then only the assembly relevant with the present invention is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
As shown in Figure 1, the invention provides a kind of design system designing diesel engine post-processing system.Described design system 1 at least comprises: logging modle 11, design module 12 and optimization module 13.
Described logging modle 11 carries out ESC(european stationary cycle for recording diesel engine, Europe steady state test circulation) relevant information of different fuel injection parameter test under each operating mode, such as, diesel engine without any after-treatment system when, described logging modle 11 records each NO in each working condition tests of ESC that diesel engine carries out based on different timing and rail pressure parameter
x, THC, CO, PM discharge and BSFC value etc.; Again such as, when diesel engine is provided with prepared each DOC+CDPF catalyst converter, described logging modle 11 records diesel engine when carrying out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, the PM degree of conversion alpha of corresponding DOC+CDPF catalyst converter sample
pM, back pressure P
b, and cost etc.; Again such as, when diesel engine is provided with based on optimum DOC+CDPF catalyst converter, described logging modle 11 records the NO of each ESC working condition tests that diesel engine carries out based on each urea injecting quantity
xconversion ratio and urea leakage rate etc.
The device that described logging modle 11 can realize above-mentioned functions based on any or module build, and such as, build based on diesel engine test stand.
Described design module 12 designs multiple DOC+CDPF catalyst converter sample structure based on extraction flow and delivery temperature mapping characteristics, to prepare corresponding DOC+CDPF catalyst converter.
The device that described determination module 12 can realize above-mentioned functions based on any or module build, such as, based on diesel engine design of experiment software, such as, JMP software builds.
Described optimization module 13 determines DOC+CDPF catalyst converter and each parameter relevant to SCR process for each relevant information recorded based on described logging modle 11.Such as, described optimization module 13 determines the optimum fuel injection parameter of diesel engine based on first principle of optimality, described optimum timing and rail pressure parameter; Again such as, described optimization module 13 is based on second principle of optimality, the PM degree of conversion alpha of each DOC+CDPF catalyst converter sample that records
pM, back pressure P
b, and cost, determine the relevant information of optimum DOC+CDPF catalyst converter; Again such as, described optimization module 13 is based on the 3rd principle of optimality, the urea injecting quantity recorded, NO
xconversion ratio and urea leakage rate determine optimum urea injecting quantity etc.
The device that described optimization module 13 can realize above-mentioned functions based on any or module build, such as, based on diesel engine Optimization Software, such as, LINDO software builds.
The preferred workflow of one of above-mentioned design system 1 as shown in Figure 2.
In step sl, diesel engine without any after-treatment system when, logging modle 11 records each NO in each ESC working condition tests that diesel engine carries out based on different timing and rail pressure parameter
x, THC, CO, PM discharge and BSFC value, to determine optimum timing and rail pressure parameter.
Particularly, with the timing of diesel engine, rail pressure for variable, different fuel injection parameter test under carrying out each operating mode of ESC under not installing the condition of any reprocessing.Wherein, testing program one has 13 operating points, have under each operating point by space filling design Software for Design go out 80 ~ 100 test point, diesel engine test stand NO of diesel engine under each test point under automatically recording each operating point
x, THC, CO, PM discharge and BSFC.
In step s 2, module 13 determines diesel engine optimum fuel injection parameter based on first principle of optimality, described optimum timing and rail pressure parameter is optimized.
Particularly, the Optimization Software of diesel engine calculates according to first principle of optimality, calculates optimum timing, rail pressure parameter.Wherein, first principle of optimality as shown in the formula:
wherein, THC
original, CO
original, BSFC
original, PM
originalthe fuel injection parameter being diesel engine does not make the emissions data of diesel engine under the condition changed.
In step s3, design module 12 designs multiple DOC+CDPF catalyst converter sample structure based on extraction flow and delivery temperature mapping characteristics, to prepare corresponding DOC+CDPF catalyst converter.
Particularly, the design of experiment software of diesel engine designs a series of DOC+CDPF test specimen structure according to extraction flow and delivery temperature mapping characteristics.
In step s 4 which, when diesel engine is provided with prepared each DOC+CDPF catalyst converter, logging modle 11 records diesel engine when carrying out each ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, the PM degree of conversion alpha of corresponding DOC+CDPF catalyst converter
pM, back pressure P
b, and cost.
In step s 5, module 13 is optimized based on second principle of optimality, the PM degree of conversion alpha of each DOC+CDPF catalyst converter that records
pM, back pressure P
b, and cost, determine the relevant information of optimum DOC+CDPF catalyst converter.
Particularly, Optimization Software calculates according to second principle of optimality, and optimizes structure and the coating formula of optimum DOC+CDPF, to prepare optimum DOC+CDPF catalyst converter based on the structure of the DOC+CDPF of this optimum and coating formula.Wherein, second principle of optimality as shown in the formula:
wherein, COST is cost, P
blimfor back pressure limit value.
In step s 6, when diesel engine is provided with optimum DOC+CDPF catalyst converter, logging modle 11 records the NO of each ESC working condition tests that diesel engine carries out based on each urea injecting quantity
xconversion ratio and urea leakage rate.
Particularly, to adding optimum DOC+CDPF catalyst converter and adopting the diesel engine of optimum timing and rail pressure parameter, optimum fuel injection parameter, the experiment of SCR urea injecting quantity is carried out.9 diesel engine condition points in abovementioned steps S1 are adopted to carry out urea injecting quantity optimization one by one.Under each measurement condition, SCR urea-spray control unit calibration tool is with the urea injecting quantity variable of SCR, and in original urea injecting quantity ± 30% scope, with 5% for urea-spray is carried out at interval, diesel engine test stand records the NO of operating mode, SCR automatically
xconversion ratio and urea leakage rate.
In the step s 7, module 13 is optimized based on the 3rd principle of optimality, the urea injecting quantity recorded, NO
xconversion ratio and urea leakage rate determine optimum urea injecting quantity, determine the after-treatment system of diesel engine thus.
Particularly, Optimization Software calculates according to the 3rd principle of optimality, calculates and urea injecting quantity best under optimizing each operating mode.3rd principle of optimality as shown in the formula:
wherein,
for the conversion rate of NOx after SCR catalytic treatment; q
lnH
3for urea leakage rate.
In addition, also can by being configured with optimum timing and rail pressure parameter, the diesel engine of optimum fuel injection parameter installs optimum DOC+CDPF catalyst converter, and adopt the aforementioned optimum urea injecting quantity determined to carry out assembly test, if pinpointed the problems, above-mentioned steps 7 is finely tuned, design the after-treatment system of diesel engine thus.
It should be noted that, the order of each step is not limited with described above, and such as, step S3 can perform before step S1 or S2 or simultaneously.
In sum, the method and system of design diesel engine post-processing system of the present invention, based on the oil consumption and the particle concentration that first initiatively promote diesel engine 2%, make the NO of exhaust
xconcentration reaches minimum; And for particulate matter quantity, the quality raised dense, then the strategy made up by the high particle collection efficiency of DOC+CDPF, in conjunction with DOC+CDPF type selecting and design, design forming one is to meet standard NO
xnH_3 leakage and particulate matter quantity, mass concentration for primary goal, are limited to the after-treatment system in critical field by discharge simultaneously; Thus, can make the waste gas based on adopting the after-treatment system designed by the present invention to process, its NH_3 leakage and particulate matter quantity, mass concentration all can be limited in critical field.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (9)
1. design a method for diesel engine post-processing system, it is characterized in that, the method for described design diesel engine post-processing system at least comprises:
Diesel engine without any after-treatment system when, each NOX in each European steady state test circulation ESC working condition tests that record diesel engine carries out based on different timing and rail pressure parameter, total hydrocarbon THC, CO, PM discharge and fuel consumption rate BSFC value, to determine optimum timing and rail pressure parameter;
The optimum fuel injection parameter of diesel engine is determined based on first principle of optimality, described optimum timing and rail pressure parameter;
Designing multiple oxidation catalysis DOC+ based on extraction flow and delivery temperature mapping characteristics has coating granule to trap CDPF catalyst converter sample structure, has coating granule to trap CDPF catalyst converter to prepare corresponding oxidation catalysis DOC+;
Diesel engine be provided with prepared each oxidation catalysis DOC+ have coating granule trap CDPF catalyst converter when, when record diesel engine carries out each European steady state test circulation ESC working condition tests based on determined optimum timing and rail pressure parameter, fuel injection parameter, corresponding oxidation catalysis DOC+ has coating granule to trap the PM conversion ratio of CDPF catalyst converter, back pressure and cost;
Coating granule is had to trap the PM conversion ratio of CDPF catalyst converter, back pressure and cost based on second principle of optimality, each oxidation catalysis DOC+ of recording, determine that optimum oxidation catalysis DOC+ has coating granule to trap the relevant information of CDPF catalyst converter, have coating granule to trap CDPF catalyst converter to prepare optimum oxidation catalysis DOC+;
Diesel engine be provided with optimum oxidation catalysis DOC+ have coating granule to trap CDPF catalyst converter when, the NOX conversion ratio of each European steady state test circulation ESC working condition tests that record diesel engine carries out based on each urea injecting quantity and urea leakage rate;
Determine optimum urea injecting quantity based on the 3rd principle of optimality, the urea injecting quantity recorded, NOX conversion ratio and urea leakage rate, design the after-treatment system of diesel engine thus.
2. the method for design diesel engine post-processing system according to claim 1, is characterized in that: first principle of optimality comprises: the minimum and oil consumption concentration of the NOx concentration after Turbochargers in Diesel Engines, particle concentration, total hydrocarbon THC concentration, CO concentration, fuel consumption rate BSFC are limited in respective prespecified range respectively.
3. the method for design diesel engine post-processing system according to claim 2, is characterized in that: the prespecified range of oil consumption concentration is less than 102% of diesel engine reset condition; Particle concentration, total hydrocarbon THC concentration, CO concentration prespecified range are separately respectively less than 95% of diesel engine reset condition separately; Fuel consumption rate BSFC is less than 102% of diesel engine reset condition.
4. the method for design diesel engine post-processing system according to claim 1, is characterized in that: second principle of optimality comprises: oxidation catalysis DOC+ has coating granule to trap CDPF catalyst converter cost minimization, have the PM conversion ratio after the process of coating granule trapping CDPF catalyst converter to be less than the second predetermined threshold higher than the first predetermined threshold, back pressure through oxidation catalysis DOC+.
5. the method for design diesel engine post-processing system according to claim 1, is characterized in that: the 3rd principle of optimality comprises: the conversion rate of NOx after SCR catalytic treatment is maximum, urea leakage rate is less than the 3rd predetermined threshold.
6. design a design system for diesel engine post-processing system, it is characterized in that, the design system of described design diesel engine post-processing system at least comprises:
Logging modle, for diesel engine without any after-treatment system when, each NOX in each European steady state test circulation ESC working condition tests that record diesel engine carries out based on different timing and rail pressure parameter, total hydrocarbon THC, CO, PM discharge and fuel consumption rate BSFC value, diesel engine be provided with prepared each oxidation catalysis DOC+ have coating granule trap CDPF catalyst converter when, record diesel engine is based on determined optimum timing and rail pressure parameter, when fuel injection parameter carries out each European steady state test circulation ESC working condition tests, corresponding oxidation catalysis DOC+ has coating granule to trap the PM conversion ratio of CDPF catalyst converter, back pressure, and cost, diesel engine be provided with optimum oxidation catalysis DOC+ have coating granule trap CDPF catalyst converter when, the NOX conversion ratio of each European steady state test circulation ESC working condition tests that record diesel engine carries out based on each urea injecting quantity and urea leakage rate,
Design module, has coating granule to trap CDPF catalyst converter sample structure for designing multiple oxidation catalysis DOC+ based on extraction flow and delivery temperature mapping characteristics, has coating granule to trap CDPF catalyst converter to prepare corresponding oxidation catalysis DOC+;
Optimize module, for determine based on first principle of optimality, described optimum timing and rail pressure parameter diesel engine optimum fuel injection parameter, to have coating granule trap the PM conversion ratio of CDPF catalyst converter sample, back pressure and cost based on second principle of optimality, each oxidation catalysis DOC+ of recording, determine optimum oxidation catalysis DOC+ have coating granule trap CDPF catalyst converter relevant information, determine optimum urea injecting quantity based on the 3rd principle of optimality, the urea injecting quantity recorded, NOX conversion ratio and urea leakage rate.
7. the design system of design diesel engine post-processing system according to claim 6, is characterized in that: described logging modle builds based on diesel engine test stand.
8. the design system of design diesel engine post-processing system according to claim 6, is characterized in that: described design module builds based on the design of experiment software of diesel engine.
9. the design system of design diesel engine post-processing system according to claim 6, is characterized in that: described optimization module builds based on the Optimization Software of diesel engine.
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| CN105114157B (en) * | 2015-06-29 | 2018-05-22 | 北京理工大学 | A kind of segmentation urea injection method of engine transition operating mode |
| US10365258B2 (en) * | 2017-08-11 | 2019-07-30 | GM Global Technology Operations LLC | Methods for determining oxidation performance of oxidation catalyst devices |
| FR3071871B1 (en) | 2017-09-29 | 2020-02-07 | Continental Automotive France | SELECTIVE CATALYTIC REDUCTION PROCESS WITH AMMONIA DESORPTION FROM A CARTRIDGE IN AN EXHAUST LINE |
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| CN110309534A (en) * | 2019-05-22 | 2019-10-08 | 同济大学 | A kind of diesel exhaust aftertreatment system structure design method |
| CN112213109A (en) * | 2020-09-16 | 2021-01-12 | 哈尔滨东安汽车发动机制造有限公司 | Initial phase test method for variable valve timing system of engine |
| CN114370321B (en) * | 2021-11-30 | 2023-03-21 | 江铃汽车股份有限公司 | Diesel engine catalyst development and evaluation method and system, readable storage medium and vehicle |
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