CN104061051A - Regeneration opportunity control method for DPF (Diesel Particulate Filter) of diesel engine - Google Patents
Regeneration opportunity control method for DPF (Diesel Particulate Filter) of diesel engine Download PDFInfo
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- CN104061051A CN104061051A CN201410300221.0A CN201410300221A CN104061051A CN 104061051 A CN104061051 A CN 104061051A CN 201410300221 A CN201410300221 A CN 201410300221A CN 104061051 A CN104061051 A CN 104061051A
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- 230000008929 regeneration Effects 0.000 title claims abstract description 48
- 238000011069 regeneration method Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 38
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 144
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 143
- 238000012544 monitoring process Methods 0.000 claims abstract description 3
- 239000008187 granular material Substances 0.000 claims description 22
- 238000012937 correction Methods 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 11
- 238000000205 computational method Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 11
- 235000019504 cigarettes Nutrition 0.000 abstract 1
- 239000008188 pellet Substances 0.000 abstract 1
- 239000004071 soot Substances 0.000 description 7
- 239000003245 coal Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 239000012876 carrier material Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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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- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention relates to a regeneration time control method for a DPF (Diesel Particulate Filter) of a diesel engine. The method comprises the following steps: measuring a pressure difference value of both ends of the DPF in real time by utilizing a pressure difference sensor; obtaining an estimated value of a DPF carbon carrying quantity by looking up a table; simultaneously monitoring whether the estimated value of the DPF carbon carrying quantity has the suddenly-reduced phenomenon; when the estimated value of the DPF carbon carrying quantity has the suddenly-reduced phenomenon, calculating a compensation value of the DPF carbon carrying quantity according to a trip distance and trip time of a vehicle after last regeneration; then adding the estimated value of the DPF carbon carrying quantity and the compensation value of the DPF carbon carrying quantity to obtain a corrected value of the DPF carbon carrying quantity; and finally, according to the size of the corrected value of the DPF carbon carrying quantity, judging whether to trigger the DPF to enter a regenerated state. In the regeneration time control method for the DPF of the diesel engine, the compensation value of the DPF carbon carrying quantity is calculated according to the suddenly-reduced condition of the estimated value of the DPF carbon carrying quantity so as to correct the DPF carbon carrying quantity; the accuracy of estimated data of the DPF carbon carrying quantity when distribution of carbon particles inside a carrier is nonuniform is greatly improved, so that regeneration time is avoided being judged by mistake and safety of a carbon cigarette pellet carrier is ensured.
Description
Technical field
The present invention relates to a kind of method that can accurately hold diesel particulate trap regeneration opportunity, belong to technical field of engines.
Background technique
Particle trap DPF(Diesel Particulate Filter) be a kind of porcelain filter being arranged in diesel engine emissions system, it can be caught before carbon soot particles enters atmosphere, reduced the discharge of particulate matter.
After particle trap trapping carbon soot particles, can cause that engine back pressure raises, cause engine performance to decline, therefore must adopt burning or other method that carbon soot particles is removed, this process is called the regeneration of DPF.In dpf regeneration process, engine load reduces suddenly (as returned suddenly idling), and the air-flow in DPF sharply reduces, and heat dissipation rate significantly reduces, and oxygen content in DPF raises, and the burning of carbon soot particles can make its bed temperature sharply rise.For preventing that temperature from surpassing the limit of bearing of carrier, the carbon carrying capacity in DPF is unsuitable too high, and while therefore regenerating, accurately the carbon carrying capacity of judgement DPF just seems particularly important.
In conventional regeneration controlling method on opportunity, in judgement DPF, the main method of carbon carrying capacity has exhaust back pressure method, running time method, carbon smoke exhaust amount method and the carbon carrying capacity estimation technique based on pressure reduction, wherein, judged result is the carbon carrying capacity estimation technique based on pressure reduction more accurately, the method is according to the corresponding relation of DPF two ends pressure difference and the inner carbon carrying capacity of DPF, utilize differential pressure pickup measure the pressure difference at DPF two ends under Under Different Work Condition of Engine and according to gas flow temperature, the impact of pressure difference revised, when the pressure reduction value of overstepping the extreme limit of DPF two ends, can judge that DPF needs regeneration.
Carbon carrying capacity method of estimation based on pressure reduction can only improve estimation precision by the isoparametric continuous correction of gas flow temperature, under special extreme case, can not accurately estimate the carbon carrying capacity in DPF.For example motor is when specific large load operation, along with the increase of induction air flow ratio, carrier flow field nonunf ormity increases, and the passive coal particle of carrier center part reduces, it is partially dense that core is compared in the distribution of carrier edge carbon granule, and carbon carrying capacity estimated value now can reduce.After and for example motor is shut down when exhaust steam moisture is bigger in the winter time; the moisture of saving bit by bit in DPF inside may freeze together with carbon granule; motor again starts and moves after a period of time; when removing, the deglaciating that DPF freezes inside may take away part carbon; cause carrier inside carbon to adhere to inequality, cause in the carbon carrying capacity estimated value short time and reduce.The in the situation that of above-mentioned carrier inside carbon skewness, the carbon carrying capacity estimation technique based on pressure reduction can cause regeneration opportunity misjudgment, causes local carbon carrying capacity in carrier to exceed standard, and has the risk that burns out carrier.
Summary of the invention
The object of the invention is to the drawback for prior art, a kind of diesel particulate trap regeneration opportunity controlling method is provided, the estimated accuracy of DPF carbon carrying capacity when improving carrier inside carbon granule skewness, while preventing dpf regeneration because of the too high carrier that burns out of carbon carrying capacity.
Problem of the present invention realizes with following technical proposals:
A kind of diesel particulate trap regeneration opportunity controlling method, the method utilizes differential pressure pickup to measure in real time the pressure difference at DPF two ends, by consulting pressure difference and the corresponding table of carbon carrying capacity, draw DPF carbon carrying capacity estimated value, monitor DPF carbon carrying capacity estimated value simultaneously and whether have bust phenomenon, when there is bust in DPF carbon carrying capacity estimated value, according to the offset of the distance travelled of vehicle after regeneration last time and running time calculating DPF carbon carrying capacity, again DPF carbon carrying capacity estimated value and offset are added, obtain the correction value of DPF carbon carrying capacity, finally according to the size of DPF carbon carrying capacity correction value, judge whether to trigger DPF and enter reproduced state.
Above-mentioned diesel particulate trap regeneration opportunity controlling method, whether monitoring DPF carbon carrying capacity estimated value exists the concrete grammar of bust to be: two DPF carbon carrying capacity estimated values that differ set time interval are compared, if the difference of the two is greater than predefined value, judge that DPF carbon carrying capacity estimated value exists bust.
Above-mentioned diesel particulate trap regeneration opportunity controlling method, the computational methods of described DPF carbon carrying capacity offset are: use respectively the carbon granule quality (g/km) of every kilometer of generation under various operating modes and the difference of the used up carbon granule quality of passive regeneration (g/km) to be multiplied by each operating mode distance travelled number (km), obtain the carbon granule quality (g) under various operating modes, and then the carbon granule quality (g) under various operating modes is added, obtain DPF carbon carrying capacity calculated value, the definite penalty coefficient of this calculated value and distance travelled by vehicle after last time regeneration and running time multiplies each other, obtain DPF carbon carrying capacity offset, described operating mode refers to engine speed and moment of torsion, under different operating modes, the carbon granule quality (g/km) of every kilometer of generation draws by test.
Above-mentioned diesel particulate trap regeneration opportunity controlling method, according to the size of DPF carbon carrying capacity correction value, judging whether to trigger the method that DPF enters reproduced state is: the threshold value of DPF carbon carrying capacity correction value and DPF carbon carrying capacity is compared, if the correction value of DPF carbon carrying capacity is greater than the threshold value of DPF carbon carrying capacity, trigger DPF and enter reproduced state, otherwise do not trigger DPF, do not enter reproduced state.
Above-mentioned diesel particulate trap regeneration opportunity controlling method, utilizes the pressure difference signal at the DPF two ends of differential pressure pickup collection should use low-pass filter to filter.
Above-mentioned diesel particulate trap regeneration opportunity controlling method, by regeneration last time, distance travelled and the definite penalty coefficient of running time of vehicle draw by test afterwards.
The present invention calculates its offset according to the bust situation of DPF carbon carrying capacity estimated value, and then DPF carbon carrying capacity is revised, while avoiding carrier inside carbon granule skewness, DPF carbon carrying capacity estimated value is on the low side, reach carrier bears the limit and can not trigger regeneration.Thereby, effectively avoided regeneration opportunity misjudgment, guaranteed the safety of carbon soot particles carrier.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is flow chart of the present invention.
In literary composition, each symbol inventory is: Δ P, DPF two ends pressure reduction.
Embodiment
Referring to Fig. 1, the present invention utilizes differential pressure pickup to gather the pressure difference signal Δ P at DPF two ends, by consult pressure difference and the corresponding table of carbon carrying capacity (soot) draw with filter after the corresponding DPF(Diesel Particulate of Δ P Filter) carbon carrying capacity estimated value.
Table 1: the corresponding table of pressure difference and carbon carrying capacity
| SOOT_INDEX | SOOT_MASS |
| 0.13 | 0 |
| 0.38 | 2.3 |
| 0.94 | 4.8 |
| 1.38 | 6.6 |
| 1.94 | 9.1 |
| 2.5 | 11.4 |
| 2.94 | 13.4 |
| 3.44 | 15.4 |
| 4 | 18.3 |
| 4.44 | 21.6 |
| 5.06 | 25.4 |
| 5.5 | 27.9 |
| 5.94 | 30.2 |
| 6.56 | 33.7 |
| 7 | 35.8 |
| 12 | 60 |
In table 1, SOOT_INDEX refers to the standard pressure-drop coefficient only being produced by carbon distribution, and SOOT_MASS refers to carbon distribution weight.
This carbon carrying capacity estimated value is divided into three tunnels, one tunnel is selected for conventional regeneration opportunity, carbon carrying capacity estimated value is greater than acceptable threshold value and (passes through support shapes, volume, the maximum carbon carrying capacity that heat radiation and Maximum allwable temperature calculate, determines in conjunction with actual vector maximum temperature, time, triggering DPF is carried out to initiative regeneration, by normal state, become reproduced state).
The setting of carbon carrying capacity threshold value: the carbon granule scope of utilizing normal carrier that the supplier (Corning Incorporated) of DPF carrier provides to bear, by testing comprehensive regeneration efficiency, the factors such as calculating error are formulated threshold values.The carbon granule scope that the normal carrier that for example Corning Incorporated provides can bear is 6-10g/L, the DPF threshold values of a 3L can setting range be 18-30g/L, but test finds to be set in unit bodies carbon distribution carrying capacity when higher, regeneration efficiency is high, be conducive to fuel-economizing, but during 28-30g/L, dpf regeneration inside temperature easily exceeds carrier bearing temperature, this temperature is affected by carrier material, for example the maximum limit temperature of aluminium titanates is 1100 ℃, consider estimation error, for avoiding exceeding DPF carrier maximum, bear carbon carrying capacity 30g/L, can be set as 25g/L.
By other two-way carbon carrying capacity 1 and carbon carrying capacity 2, synchronize with the different time of carbon carrying capacity estimated value and (or claim that the different time gets, such as the every value recording with sensor for 1 second of carbon carrying capacity 1, get etc. once, the every 100s of carbon carrying capacity 2 and measurement value sensor are got etc. once), judge whether DPF carbon carrying capacity estimated value exists the situation of bust.1 long period of carbon carrying capacity, (this time was test empirical value, can by the time of starting to engine coolant water temperature reaches temperature of equilibrium substantially, be determined according to vehicle) synchronize once with carbon carrying capacity estimated value, 2 short periods of carbon carrying capacity (this time can determine that by system the minimum time of a stable carbon carrying capacity variation is definite, and the 1-2 of desirable system response time doubly) synchronize once with carbon carrying capacity estimated value.Because carbon carrying capacity 1 is different lock in time with the estimated value of carbon carrying capacity from the signal of carbon carrying capacity 2, carbon carrying capacity 1 may there are differences with the value of carbon carrying capacity 2, these two numerical value compare the carbon carrying capacity that can judge in carrier to be increased and minimizing situation, by test, obtain the carbon carrying capacity threshold value of an abnormal bust, surpass this threshold value and judge that DPF carbon carrying capacity has bust situation.
The time lag that different time is synchronous and the establishing method of predefined value; The time lag and predefined value are drawn by test data, specific operation for example, for by the inaccurate situation of artificial analog D PF carbon carrying capacity, (motor is when the specific large load operation, increase along with induction air flow ratio, carrier flow field nonunf ormity increases, the passive coal particle of carrier center part reduces, it is partially dense that core is compared in the distribution of carrier edge carbon granule, and carbon carrying capacity estimated value now can reduce.After and for example motor is shut down when exhaust steam moisture is bigger in the winter time; the moisture of saving bit by bit in DPF inside may freeze together with carbon granule; motor again starts and moves after a period of time; when removing, the deglaciating that DPF freezes inside may take away part carbon; cause carrier inside carbon to adhere to inequality, cause in the carbon carrying capacity estimated value short time and reduce.), by repeatedly simulating pressure reduction, estimate that time and the variable quantity of phenomenon generation on the low side carry out record, choose comparatively rationally the also numerical value of insurance and be set time interval and predefined value.
If judgement estimated value has bust phenomenon to occur, by the carbon soot particles quality that calculates the original discharge of motor according to condition simulations such as Vehicle-Miles of Travel and running time, engine speed moments of torsion, (be the carbon granule quality g/km of every kilometer of generation of motor under different operating mode, do not consider the part that passive regeneration trumpet falls in DPF), by original discharge amount, in conjunction with actual items, calculate an offset, be added in the carbon carrying capacity estimated value of actual measurement it is revised, and then trigger in advance DPF and enter reproduced state, empty the carbon distribution in DPF, prevent that DPF carrier from damaging.When DPF is by entering after regeneration, offset will be emptied automatically.
5g in Fig. 1 is predefined value; 0g exports 0g exactly, is equivalent to not compensate; 25g is threshold values, and these numerical value can be set as the case may be.
The carbon granule quality g/km that offset equals every kilometer of generation under different operating mode deducts the used up carbon granule quality of passive regeneration g/km and is multiplied by each operating mode distance travelled and counts km and then sue for peace, obtain DPF carbon carrying capacity calculated value, the definite penalty coefficient of this calculated value and distance travelled by vehicle after last time regeneration and running time multiplies each other, and obtains DPF carbon carrying capacity offset.Note: operating mode mean engine rotating speed and moment of torsion, under different operating modes, every kilometer of carbon granule quality coefficient is drawn by test.
According to the distance travelled apart from last time regeneration be multiplied by carbon carrying capacity calculated value apart from the penalty coefficient that the running time of regeneration last time obtains and be carbon carrying capacity offset, in test, find, apart from last time, distance travelled and the running time of regeneration were longer, the inner carbon of DPF divides more inhomogeneous, there is the inner carbon carrying capacity sudden change of DPF risk larger, deviation after undergoing mutation is larger, and the relation of penalty coefficient and Vehicle-Miles of Travel and running time is as shown in table 2:
Table 2:
Table 2(is continuous):
Claims (6)
1. a diesel particulate trap regeneration opportunity controlling method, it is characterized in that, the method utilizes differential pressure pickup to measure in real time the pressure difference at DPF two ends, by consulting pressure difference and the corresponding table of carbon carrying capacity, draw DPF carbon carrying capacity estimated value, monitor DPF carbon carrying capacity estimated value simultaneously and whether have bust phenomenon, when there is bust in DPF carbon carrying capacity estimated value, according to the offset of the distance travelled of vehicle after regeneration last time and running time calculating DPF carbon carrying capacity, again DPF carbon carrying capacity estimated value and offset are added, obtain the correction value of DPF carbon carrying capacity, finally according to the size of DPF carbon carrying capacity correction value, judge whether to trigger DPF and enter reproduced state.
2. diesel particulate trap regeneration opportunity controlling method according to claim 1, it is characterized in that, whether monitoring DPF carbon carrying capacity estimated value exists the concrete grammar of bust to be: two DPF carbon carrying capacity estimated values that differ set time interval are compared, if the difference of the two is greater than predefined value, judge that DPF carbon carrying capacity estimated value exists bust.
3. diesel particulate trap regeneration opportunity controlling method according to claim 1 and 2, it is characterized in that, the computational methods of described DPF carbon carrying capacity offset are: use respectively the carbon granule quality (g/km) of every kilometer of generation under various operating modes and the difference of the used up carbon granule quality of passive regeneration (g/km) to be multiplied by each operating mode distance travelled number (km), obtain the carbon granule quality (g) under various operating modes, and then the carbon granule quality (g) under various operating modes is added, obtain DPF carbon carrying capacity calculated value, the definite penalty coefficient of this calculated value and distance travelled by vehicle after last time regeneration and running time multiplies each other, obtain DPF carbon carrying capacity offset, described operating mode refers to engine speed and moment of torsion, under different operating modes, the carbon granule quality (g/km) of every kilometer of generation draws by test.
4. diesel particulate trap regeneration opportunity controlling method according to claim 3, it is characterized in that, according to the size of DPF carbon carrying capacity correction value, judging whether to trigger the method that DPF enters reproduced state is: the threshold value of DPF carbon carrying capacity correction value and DPF carbon carrying capacity is compared, if the correction value of DPF carbon carrying capacity is greater than the threshold value of DPF carbon carrying capacity, trigger DPF and enter reproduced state, otherwise do not trigger DPF, do not enter reproduced state.
5. diesel particulate trap regeneration opportunity controlling method according to claim 4, is characterized in that, utilizes the pressure difference signal at the DPF two ends of differential pressure pickup collection should use low-pass filter to filter.
6. diesel particulate trap regeneration opportunity controlling method according to claim 5, is characterized in that, by regeneration last time, distance travelled and the definite penalty coefficient of running time of vehicle draw by test afterwards.
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| CN105971747A (en) * | 2016-06-27 | 2016-09-28 | 南京依维柯汽车有限公司 | Method for manual regeneration of DPF by driver |
| CN106837496A (en) * | 2017-01-25 | 2017-06-13 | 中国第汽车股份有限公司 | Engine particulate purifying regeneration control system |
| CN107956543A (en) * | 2017-11-28 | 2018-04-24 | 东风商用车有限公司 | Diesel engine particle trap fault detection system and detection method thereof |
| CN109184872A (en) * | 2018-10-24 | 2019-01-11 | 江苏大学 | A kind of judgment method on the diesel engine dpf regeneration opportunity based on carbon carrying capacity |
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