CN103528916B - A kind of carbon carrying capacity scaling method for diesel particulate filter and system - Google Patents
A kind of carbon carrying capacity scaling method for diesel particulate filter and system Download PDFInfo
- Publication number
- CN103528916B CN103528916B CN201310451299.8A CN201310451299A CN103528916B CN 103528916 B CN103528916 B CN 103528916B CN 201310451299 A CN201310451299 A CN 201310451299A CN 103528916 B CN103528916 B CN 103528916B
- Authority
- CN
- China
- Prior art keywords
- carrying capacity
- carbon carrying
- value
- flow
- calibration
- 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
Abstract
The invention provides a kind of carbon carrying capacity scaling method for DPF and system, described method comprises: measure when the actual carbon carrying capacity of DPF is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction; Described flow is the exhaust volume flow of DPF, and described pressure reduction is the air intake opening of DPF and the draught head of exhausr port; In flow pressure-difference coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as maximum carbon carrying capacity limit value; Wherein, the calibration line of corresponding maximum carbon carrying capacity limit value is the line of the some formation of flow and the pressure reduction correspondence in flow pressure-difference coordinate system recorded.Thus achieve the carbon carrying capacity of DPF is demarcated, according to the region calibrated, just can realize learning whether current carbon carrying capacity reaches maximum carbon carrying capacity limit value according to the actual flow that records and pressure reduction, not need at any time dismounting to be carried out to DPF and weigh, thus simplify operation.
Description
Technical field
The present invention relates to Motor Control Field, especially relate to a kind of carbon carrying capacity scaling method for diesel particulate filter and system.
Background technology
The emission of diesel engine not only can to environment, also can the health of harmful to human.In order to reduce its harm, at present usually through DPF(diesel particulate filter, diesel particulate filter) particulate in diesel engine vent gas is filtered.But along with the increase of DPF working time, the particulate that the carrier of DPF gathers, by increasing the resistance to flow of exhaust, causes diesel engine output power to reduce, and oil consumption increases.Therefore, when the particulate that DPF gathers reaches certain limit value, need to utilize outside energy to make the particle burning accumulated on DPF carrier, this process is called the initiative regeneration of DPF.Because the particulate major part gathered at DPF is carbon particulate, therefore conventional carbon carrying capacity represents the particle number that DPF gathers.
At present, in order to realize the initiative regeneration of DPF, in working process of diesel engine, at any time DPF to being pulled down and weighing, when finding that DPF carbon carrying capacity reaches carbon carrying capacity threshold limit value, carrying out initiative regeneration.But this method will be pulled down DPF at any time and weigh, therefore complex operation.
Obviously, need a kind of mode that the carbon carrying capacity of DPF is demarcated, make not need to weigh to DPF at any time by the result of this demarcation, can find whether DPF carbon carrying capacity reaches threshold limit value.
Summary of the invention
The technical matters that the present invention solves is to provide a kind of carbon carrying capacity scaling method for diesel particulate filter and system, achieve the result according to demarcating, do not need to weigh to DPF at any time, can find whether DPF carbon carrying capacity reaches threshold limit value, thus simplify operation.
For this reason, the technical scheme of technical solution problem of the present invention is:
The invention provides a kind of carbon carrying capacity scaling method for diesel particulate filter, described method comprises:
Measure when the actual carbon carrying capacity of diesel particulate filter is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction; Described flow is the exhaust volume flow of described diesel particulate filter, and described pressure reduction is the air intake opening of described diesel particulate filter and the draught head of exhausr port;
In flow pressure-difference coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value;
Wherein, the calibration line of described correspondence maximum carbon carrying capacity limit value is the line of the some formation of flow and the pressure reduction correspondence in flow pressure-difference coordinate system recorded.
Preferably, described method also comprises:
Be more than or equal to 0, and optional at least one number in the interval being less than described maximum carbon carrying capacity limit value, using at least one number of choosing as carbon carrying capacity calibration value, when the actual carbon carrying capacity of measurement diesel particulate filter is specially each carbon carrying capacity calibration value, the flow under the operating point of universal characteristic test and pressure reduction;
The flow recorded when the actual carbon carrying capacity recorded is specially either carbon carrying capacity calibration value and pressure reduction, the carbon carrying capacity value of point corresponding in flow pressure-difference coordinate system is demarcated as this carbon carrying capacity calibration value;
In flow pressure-difference coordinate system, the line that the point of corresponding same carbon carrying capacity calibration value is formed is specially calibration line corresponding to this carbon carrying capacity calibration value;
Region dividing between the calibration line adjacent by each is several regions, utilize the progressive law that the carbon carrying capacity value of some correspondences all in described coordinate system has, by the carbon carrying capacity value that several region labelings divided are corresponding, described progressive law is specially for two adjacent calibration lines, at the calibration line that the carbon carrying capacity calibration value of correspondence is relatively little, to on the direction of relatively large calibration line, the carbon carrying capacity calibration value relatively little by this, increases progressively to relatively large carbon carrying capacity calibration value direct proportion.
Preferably, described method also comprises: when described carbon carrying capacity calibration value comprises 0, the carbon carrying capacity value that calibration line corresponding when being 0 by carbon carrying capacity calibration value is corresponding with the region that the positive axis of flow coordinate axis forms is demarcated as 0.
Preferably, described by the Region dividing between each adjacent calibration line for several regions are specially: the region between the calibration line adjacent by each is divided into the region of several equal numbers;
Then at the calibration line of the minimum carbon carrying capacity calibration value of correspondence on the direction of the calibration line of correspondence maximum carbon carrying capacity limit value, carbon carrying capacity value equal difference corresponding to each region divided increases progressively.
Preferably, when the actual carbon carrying capacity of measurement diesel particulate filter is specially each carbon carrying capacity calibration value, when the actual carbon carrying capacity of the flow under the operating point of universal characteristic test and pressure reduction and measurement diesel particulate filter is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction are specially:
According to carbon carrying capacity calibration value order from small to large, when the actual carbon carrying capacity measuring diesel particulate filter is successively specially each carbon carrying capacity calibration value, flow under the operating point of universal characteristic test and pressure reduction, finally measure actual carbon carrying capacity when being specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction.
Preferably, the flow under the operating point tested at universal characteristic of described measurement and pressure reduction are specially:
According to diesel engine rotating speed order from low to high and when every speed, the order that load is ascending, measures the flow under each operating point and pressure reduction successively.
Preferably, also comprise after described method:
Measure the current flow of diesel particulate filter and pressure reduction;
According to the current flow recorded and pressure reduction, the region belonging to finding in described flow pressure-difference coordinate system, using carbon carrying capacity value corresponding for this region as current carbon carrying capacity value;
If when current carbon carrying capacity value is maximum carbon carrying capacity limit value, carry out initiative regeneration to diesel particulate filter.
Preferably, described flow is represented by air speed, and described air speed is the exhaust volume flow of the unit carrier bulk of described diesel particulate filter,
Then described flow pressure-difference coordinate system is specially air speed pressure reduction coordinate system.
Present invention also offers a kind of carbon carrying capacity calibration system for diesel particulate filter, described system comprises:
Measurement mechanism, when the actual carbon carrying capacity for measuring diesel particulate filter is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction;
Caliberating device, in flow pressure-difference coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value;
Wherein, described flow is the exhaust volume flow of described diesel particulate filter, and described pressure reduction is the air intake opening of diesel particulate filter and the draught head of exhausr port; The calibration line of described correspondence maximum carbon carrying capacity limit value is the line that the point of flow and the pressure reduction correspondence in flow pressure-difference coordinate system recorded is formed.
Preferably, be more than or equal to 0, and optional at least one number in the interval being less than described maximum carbon carrying capacity limit value, using at least one number of choosing as carbon carrying capacity calibration value;
Described measurement mechanism also for, measure the actual carbon carrying capacity of diesel particulate filter when being specially each carbon carrying capacity calibration value, the flow under the operating point of universal characteristic test and pressure reduction;
Described caliberating device also for, the flow recorded when the actual carbon carrying capacity recorded is specially either carbon carrying capacity calibration value and pressure reduction, the carbon carrying capacity value of point corresponding in flow pressure-difference coordinate system is demarcated as this carbon carrying capacity calibration value; In flow pressure-difference coordinate system, the line that the point of corresponding same carbon carrying capacity calibration value is formed is specially calibration line corresponding to this carbon carrying capacity calibration value; Region dividing between the calibration line adjacent by each is several regions, utilizes the progressive law that the carbon carrying capacity value of some correspondences all in described coordinate system has, and is corresponding carbon carrying capacity value by several region labelings divided;
Wherein, described progressive law is specially for two adjacent calibration lines, at the calibration line that the carbon carrying capacity calibration value of correspondence is relatively little, on the direction of relatively large calibration line, the carbon carrying capacity calibration value relatively little by this, increases progressively to relatively large carbon carrying capacity calibration value direct proportion.
Known by technique scheme, measure when actual carbon carrying capacity is maximum carbon carrying capacity limit value in the present invention, the flow under the operating point that diesel particulate filter is tested at universal characteristic and pressure reduction.And utilize when flow one timing, pressure reduction is larger, then corresponding carbon carrying capacity is larger, when pressure reduction one timing, flow is larger, the rule that then corresponding carbon carrying capacity is less, in flow pressure-difference coordinate system, the carbon carrying capacity value corresponding to the region form the positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value is demarcated as maximum carbon carrying capacity limit value.That is, points all in this region, corresponding carbon carrying capacity value all reaches maximum carbon carrying capacity limit value.Thus achieve the carbon carrying capacity of DPF is demarcated, according to the region calibrated, just can realize learning whether current carbon carrying capacity reaches maximum carbon carrying capacity limit value according to the actual flow that records and pressure reduction, not need at any time dismounting to be carried out to DPF and weigh, thus simplify operation.Owing to have chosen the operating point of universal characteristic test, therefore, it is possible to reflect most of perform region of diesel engine, thus obtain than more complete calibration result.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the first embodiment of carbon carrying capacity scaling method provided by the invention;
Fig. 2 is the calibration result of the embodiment shown in Fig. 1 in air speed pressure reduction coordinate system;
Fig. 3 is the schematic flow sheet of the second embodiment of carbon carrying capacity scaling method provided by the invention;
Fig. 4 is the calibration result of the embodiment shown in Fig. 3 in air speed pressure reduction coordinate system;
Fig. 5 is the calibration result to the region B in air speed pressure reduction coordinate system;
Fig. 6 is the schematic flow sheet of the 3rd embodiment of carbon carrying capacity scaling method provided by the invention;
Fig. 7 is the structural representation of a kind of active regeneration system provided by the invention;
Fig. 8 is the structural representation of the specific embodiment of carbon carrying capacity calibration system provided by the invention.
Embodiment
Be carbon particulate in the particulate major part of DPF inner accumulated, therefore usually adopt carbon carrying capacity to represent the particulate of DPF inner accumulated.Carbon carrying capacity refers to the particle mass in unit carrier bulk.When the carbon carrying capacity of DPF reaches carbon carrying capacity threshold limit value, such as 5 grams per liters, or during 4.5 grams per liter, usually to carry out initiative regeneration to DPF.Initiative regeneration refers to and utilizes outside energy to improve the temperature in DPF, makes particulate ignition.Initiative regeneration has the combustion-supporting regeneration of oil spout, electrical heating regeneration, microwave heating regeneration etc.
The invention provides a kind of carbon carrying capacity scaling method for DPF and system, achieving the result according to demarcating, not needing to weigh to DPF at any time, can find whether DPF carbon carrying capacity reaches threshold limit value, thus simplify operation.
Refer to Fig. 1, the invention provides the first embodiment of the carbon carrying capacity scaling method for DPF, in the present embodiment, described method comprises:
S101: measure when the actual carbon carrying capacity of DPF is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction; Described flow is the exhaust volume flow of described DPF, and described pressure reduction is the air intake opening of described DPF and the draught head of exhausr port.
Universal characteristic test is for measuring diesel engine under each rotating speed of external characteristics, and explosion pressure, smoke intensity and other conventional parameter under each load.The corresponding specific rotating speed of each operating point of universal characteristic test and load.Such as, all operating points of universal characteristic test comprise diesel engine speed from idling (such as 600 revs/min), increase until reach maximum (top) speed value (such as 1900 revs/min) in units of 100 revs/min, and when load is respectively full-power 10%, 25%, 30%, 40%, 50%, 60%, 75%, 90%, 100%, each corresponding operating point.
The operating point that universal test is chosen covers the most perform region of diesel engine, and therefore, the actual carbon carrying capacity of demarcation DPF that can be comparatively complete in the embodiment of the present invention is flow and pressure reduction that maximum carbon carrying capacity limit value is corresponding.In fact, the operating point of the described universal characteristic test in the present embodiment can be all operating points of universal characteristic test, the Part load point also universal characteristic can being selected to test according to actual conditions.
Pressure reduction in the present embodiment can be detected by differential pressure pickup before and after DPF and obtain.Flow in the present embodiment is the exhaust volume flow of DPF.The following describes a kind of account form calculating the exhaust volume flow of DPF.
Exhaust volume flow Q
v=Q
m/ ρ (1)
Wherein, Q
mfor exhaust mass flow, the exhaust quality of DPF in the representation unit time, ρ is exhaust gas density.
Exhaust mass flow Q
m=Q
m1+ Q
m2.（2）
Q
m1for the air-mass flow recorded, the air mass of DPF in the representation unit time, air-mass flow can be detected by intake flow sensor and obtain, and unit can be kg/h.Q
m2for the fuel consume quality of diesel engine in the unit time, unit can be kg/h.
And exhaust gas density ρ=Q
m'/V.（3）
Q
m' be the exhaust quality of DPF in the unit time, V is the exhaust volume of unit time.
According to carat uncle agriculture equation P V=nRT, there is V=nRT/P(4)
Wherein, R is constant, usually gets 8314, and unit is Pa × L/(mol × K), T is delivery temperature, and unit is Kelvin, and T=t+273, t are the delivery temperature in units of Celsius temperature, T or t can be recorded by temperature measuring equipment.P is that DPF is vented air pressure, specifically can be recorded by air pressure measuring apparatus.
N is the molal quantity of exhaust gas, therefore n=Q
m'/M(5)
M is exhaust molecular weight, is taken as 29 here.Formula (4) and formula (5) are brought in formula (3), can ρ=MP/RT(6 be obtained)
Formula (6) and formula (2) are brought in formula (1), can Q be obtained
v=[(Q
m1+ Q
m2) × RT]/(MP),
Wherein, air-mass flow Q
m1, the fuel consume quality Q of diesel engine in the unit interval
m2, delivery temperature T and DPF be vented air pressure P and all can directly record, exhaust molecular weight M and R is constant.Therefore, it is possible to obtain exhaust volume flow Q
vvalue.
Here, present invention provides a kind of calculating exhaust volume flow Q
vaccount form, in fact, Q
vaccount form be not only confined to aforesaid way.
It should be noted that, in the present embodiment, also can represent described flow by air speed, namely the exhaust volume flow of described DPF.Air speed is the exhaust volume flow of the unit carrier bulk of DPF, i.e. air speed ν=Q
v/ V', wherein Q
vfor exhaust volume flow, V' is the carrier bulk of DPF, is definite value for fixing DPF.
S102: in flow pressure-difference coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value.Wherein, the calibration line of described correspondence maximum carbon carrying capacity limit value is the line of the some formation of flow and the pressure reduction correspondence in flow pressure-difference coordinate system recorded in step S101.Here, the straight line of the round and smooth curve that the line that the point of described correspondence is formed can be linked to be for corresponding point or the broken line be linked to be or the some matching according to correspondence.
The region that positive axis and the calibration line of corresponding maximum carbon carrying capacity limit value of pressure reduction coordinate axis form refers to, the angle that the positive axis of pressure reduction coordinate axis and this calibration line composition one are less than 90 °, this be less than the angle of 90 ° right meet the region that pressure reduction and flow are all greater than 0.
Flow pressure-difference coordinate in the present embodiment is two-dimensional coordinate system, in this two-dimensional coordinate system, has pressure reduction coordinate axis and flow coordinate axis two coordinate axis.In this two-dimensional coordinate system, the corresponding carbon carrying capacity value of each point in the region of the positive axis of pressure reduction coordinate axis and the positive axis composition of flow coordinate axis.Owing to working as flow one timing, pressure reduction is larger, then corresponding carbon carrying capacity is larger, when pressure reduction one timing, flow is larger, then corresponding carbon carrying capacity is less, and carbon carrying capacity value corresponding to the region therefore positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value.The carbon carrying capacity of some correspondences all in this region all reaches maximum carbon carrying capacity limit value.Thus achieve the carbon carrying capacity of DPF is demarcated, according to the region calibrated, just can realize learning whether current carbon carrying capacity reaches maximum carbon carrying capacity limit value according to the actual flow that records and pressure reduction.
Such as, Fig. 2 is flow pressure-difference coordinate system, and the point being wherein designated as d is the flow that records in step S101 and point corresponding to pressure reduction, and these points form the calibration line of described correspondences maximum carbon carrying capacity limit value.Such as, these put the curve be linked to be is described calibration line.Then the positive axis of pressure reduction coordinate axis and these put the region that the line that formed forms, the region F namely in Fig. 2, the carbon carrying capacity value of correspondence is demarcated as maximum carbon carrying capacity limit value.According to this demarcation region, when the point that the flow and pressure reduction that record DPF are corresponding in this flow pressure-difference coordinate system falls into this region F, then illustrate that now carbon carrying capacity has reached maximum carbon carrying capacity limit value, needs to carry out initiative regeneration.
It should be noted that, if represent described flow by air speed in the present embodiment, then the flow pressure-difference coordinate system now in the present embodiment is specially air speed pressure reduction coordinate system, and the flow coordinate axis in this flow pressure-difference coordinate system is then specially air speed coordinate axis.Particularly, in step S101, what measure is when the actual carbon carrying capacity of DPF is specially maximum carbon carrying capacity limit value, air speed under the operating point of universal characteristic test and pressure reduction, in step s 102, in air speed pressure reduction coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value.Wherein, the calibration line of described correspondence maximum carbon carrying capacity limit value is the line of the some formation of air speed and the pressure reduction correspondence in air speed pressure reduction coordinate system recorded in step S101.
Known by technique scheme, measure when actual carbon carrying capacity is maximum carbon carrying capacity limit value in the present invention, the flow under the operating point that DPF tests at universal characteristic and pressure reduction.And utilize when flow one timing, pressure reduction is larger, then corresponding carbon carrying capacity is larger, when pressure reduction one timing, flow is larger, the rule that then corresponding carbon carrying capacity is less, in flow pressure-difference coordinate system, the carbon carrying capacity value corresponding to the region form the positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value is demarcated as maximum carbon carrying capacity limit value.That is, points all in this region, corresponding carbon carrying capacity value all reaches maximum carbon carrying capacity limit value.Thus achieve the carbon carrying capacity of DPF is demarcated, according to the region calibrated, just can realize learning whether current carbon carrying capacity reaches maximum carbon carrying capacity limit value according to the actual flow that records and pressure reduction, not need at any time dismounting to be carried out to DPF and weigh, thus simplify operation.Owing to have chosen the operating point of universal characteristic test, therefore, it is possible to reflect most of perform region of diesel engine, thus obtain than more complete calibration result.In addition, also avoid the situation of not carrying out initiative regeneration in time caused not in time and easily owing to weighing.
In the step S101 of the present embodiment when measuring flow (or air speed) and pressure reduction, can be from the minimum speed of diesel engine, increase until reach maximum (top) speed successively, and when every speed, according to the order that load is ascending, measure the flow (or air speed) under each operating point and pressure reduction successively.That is, the flow of described measurement in step S101 under the operating point that universal characteristic is tested and pressure reduction are specially: according to diesel engine rotating speed order from low to high and when every speed, the order that load is ascending, measures the flow under each operating point and pressure reduction successively.Such as, can from idling, such as 600 revs/min, minimum load, the such as operating point of full-power 10% correspondence starts to measure, measure rotating speed afterwards constant, still be 600 revs/min, load increases successively, namely measuring load is successively full-power 25%, 30%, 40%, 50%, 60%, 75%, 90%, each operating point when 100%, increasing rotating speed is afterwards 700 revs/min, measure each operating point when load is increased to 100% from full-power 10% successively, the like, until measuring rotating speed is maximum (top) speed, such as 1900 revs/min, each operating point when load is increased to 100% successively from full-power 10%.
When measuring, from the operating point that the rotating speed of diesel engine is minimum and load is minimum, be that the delivery temperature of diesel engine is relatively low, can not cause the passive regeneration of DPF because temperature is too high because under slow-speed of revolution underload; Simultaneously because extraction flow under slow-speed of revolution underload is relatively little, in the exhaust that DPF filters, the total amount of particulate is less, therefore relatively little on the impact of carbon deposition quantity in DPF in diesel engine operational process.That is, the concrete DPF carbon carrying capacity of acquisition one (such as a) after, DPF is connected to stand and tests, in ensuing measuring process, suppose that the carbon carrying capacity of DPF is indeclinable, be always a.But in fact, DPF is after being connected to stand, and its carbon carrying capacity will change, be accumulate due to filtration on the one hand, be passive regeneration consumption on the one hand, both all can produce certain influence to result in theory.During the underload slow-speed of revolution, the exhaust total amount that diesel engine produces is less, and the amount of now filtering accumulation relatively can be less; Delivery temperature is lower simultaneously, and passive regeneration amount is also relatively less.Therefore, adopt rotating speed from low to high, the mode of the ascending increase of load can reduce the impact that diesel engine run duration causes carbon deposition quantity initial in DPF because there is DPF passive regeneration and soot accumulation.
Utilize the region that the present embodiment is demarcated out, can judge whether corresponding carbon carrying capacity reaches maximum carbon carrying capacity limit value, namely carries out initiative regeneration the need of to DPF according to the current flow of DPF and pressure reduction.Particularly, can also comprise after the described method of the present embodiment: measure the current flow of DPF and pressure reduction; According to the current flow recorded and pressure reduction, the region belonging to finding in described flow pressure-difference coordinate system, using carbon carrying capacity value corresponding for this region as current carbon carrying capacity value; If when current carbon carrying capacity value is maximum carbon carrying capacity limit value, carry out initiative regeneration to DPF.
According to technique scheme, a region has only been demarcated in a upper embodiment of the present invention, in fact, other regions in flow pressure-difference coordinate system further can also be demarcated, thus the carbon carrying capacity value corresponding in other regions can be learnt, obtain a more complete carbon carrying capacity MAP of ratio.But, when measuring flow corresponding to each carbon carrying capacity and pressure reduction, if the difference choosing between each carbon carrying capacity is smaller, the coverage rate measuring the result come can be larger, but workload is also larger, if and in order to reduce workload, it is larger that the difference between each carbon carrying capacity is chosen, then the coverage rate measuring the result come can be made to diminish.In order to solve the problem, though namely make the difference between each carbon carrying capacity select smaller, also can ensure to measure the coverage rate that the result come is larger, the invention provides another embodiment of the carbon carrying capacity scaling method for DPF.In the following embodiments, represent that flow is illustrated for air speed.
Refer to Fig. 3, the invention provides the second embodiment of the carbon carrying capacity scaling method for DPF, in the present embodiment, described method comprises:
S301: be more than or equal to 0, and optional at least one number in the interval being less than described maximum carbon carrying capacity limit value, using at least one number of choosing as carbon carrying capacity calibration value.Such as, as shown in Figure 4, choose 0, a, b, c as carbon carrying capacity calibration value, wherein, 0, a, b, c be all less than the maximum carbon carrying capacity limit value d of DPF.When the actual carbon carrying capacity of measurement DPF is specially each carbon carrying capacity calibration value, the air speed under the operating point of universal characteristic test and pressure reduction.
Such as, in the present embodiment, can be measure the actual carbon carrying capacity of DPF to be respectively, 0, a, b, c time, the air speed under the operating point of universal characteristic test and pressure reduction.
When measuring air speed and the pressure reduction of each actual carbon carrying capacity, can according to diesel engine rotating speed from low to high, when every speed, the order that load is ascending, measures the air speed under each operating point and pressure reduction successively.
S302: the air speed recorded when the actual carbon carrying capacity recorded is specially either carbon carrying capacity calibration value and pressure reduction, the carbon carrying capacity value of point corresponding in air speed pressure reduction coordinate system is demarcated as this carbon carrying capacity calibration value.
Such as shown in Fig. 4, corresponding air speed and pressure reduction when to have recorded actual carbon carrying capacity in step S301 be 0, find corresponding point according to this air speed and pressure reduction, the carbon carrying capacity value of the point of these correspondences be demarcated as 0 in the air speed pressure reduction coordinate system shown in Fig. 4.Similarly, point corresponding when carbon carrying capacity calibration value is respectively a, b, c is obtained.
S303: measure when the actual carbon carrying capacity of DPF is specially maximum carbon carrying capacity limit value, the air speed under the operating point of universal characteristic test and pressure reduction.
Described air speed in the present embodiment is the exhaust volume flow of DPF carrier bulk described in unit, and described pressure reduction is the air intake opening of described DPF and the draught head of exhausr port.
Step S101 in embodiment shown in this step and Fig. 1 is similar, and relevant part, with reference to the embodiment shown in figure 1, repeats no more here.
S304: in air speed pressure reduction coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value.Wherein, the calibration line of described correspondence maximum carbon carrying capacity limit value is the line of the some formation of air speed and the pressure reduction correspondence in air speed pressure reduction coordinate system recorded.
As shown in Figure 4, the line that positive axis and the point being designated as d of pressure reduction coordinate axis are formed constitutes region F, and the carbon carrying capacity value that region F is corresponding is maximum carbon carrying capacity limit value d.
Step S102 in embodiment shown in this step and Fig. 1 is similar, and relevant part, with reference to the embodiment shown in figure 1, repeats no more here.
S305: the Region dividing between the calibration line adjacent by each is several regions, utilize the progressive law that the carbon carrying capacity value of some correspondences all in described coordinate system has, by the carbon carrying capacity value that several region labelings divided are corresponding, described progressive law is specially for two adjacent calibration lines, at the calibration line that the carbon carrying capacity calibration value of correspondence is relatively little, to on the direction of relatively large calibration line, the carbon carrying capacity calibration value relatively little by this, increases progressively to relatively large carbon carrying capacity calibration value direct proportion; Wherein, in air speed pressure reduction coordinate system, the line that the point of corresponding same carbon carrying capacity calibration value is formed is specially calibration line corresponding to this carbon carrying capacity calibration value.Here, the straight line of the round and smooth curve that the line that the point of described correspondence is formed can be linked to be for corresponding point or the broken line be linked to be or the some matching according to correspondence.
Here described progressive law is said, in this progressive law, said direct proportion increases progressively, refer at the relatively little calibration line of the carbon carrying capacity calibration value of described correspondence, to on the direction of relatively large calibration line, carbon carrying capacity value and distance direct proportionality, that is, the ratio of carbon carrying capacity value and the party distance is upwards certain value.
After execution of step S304, only measure in the present embodiment that actual carbon carrying capacity is 0, a, b, c, d time corresponding air speed and pressure reduction, all carbon carrying capacity situations can not be covered.Therefore need to fill B, C, D, E region in the air speed pressure reduction coordinate system shown in Fig. 4.Wherein, B region is carbon carrying capacity calibration value calibration line corresponding when being 0, the region between calibration line corresponding when being a with carbon carrying capacity calibration value; C region is carbon carrying capacity calibration value calibration line corresponding when being a, the region between calibration line corresponding when being b with carbon carrying capacity calibration value; D region is carbon carrying capacity calibration value calibration line corresponding when being b, the region between calibration line corresponding when being c with carbon carrying capacity calibration value; E region is carbon carrying capacity calibration value calibration line corresponding when being c, the region between calibration line corresponding when being d with carbon carrying capacity calibration value.
Inventor finds through a large amount of experiments, the carbon carrying capacity value of some correspondences all in the air speed pressure reduction coordinate system in the embodiment of the present invention has a progressive law, namely for two adjacent calibration lines, at the calibration line that the carbon carrying capacity calibration value of correspondence is relatively little, to on the direction of relatively large calibration line, the carbon carrying capacity calibration value relatively little by this, increases progressively to relatively large carbon carrying capacity calibration value direct proportion.In air speed pressure reduction coordinate system such as shown in Fig. 5, for carbon carrying capacity calibration value be 0 and carbon carrying capacity calibration value be the calibration line that two of a are adjacent, it is the line of the some formation of 0 at calibration value, on the direction of the line formed to the calibration value point that is a (direction shown in the arrow namely in Fig. 5), carbon carrying capacity value is increased progressively by 0 to a direct proportion.Therefore, be several regions by the Region dividing between each adjacent calibration line in the present embodiment, according to above-mentioned progressive law, by the carbon carrying capacity value that several region labelings divided are corresponding, in fact, being utilize above-mentioned progressive law in the present embodiment, is the carbon carrying capacity value of correspondence by several region labelings divided by method of interpolation.
Illustrate the carbon carrying capacity value of how to demarcate regional below.As shown in Figure 5, corresponding carbon carrying capacity value is the calibration line of 0, is the calibration line compositing area B of a, region B is divided into several regions with corresponding carbon carrying capacity value, such as, region B is divided into three regions, i.e. region B1, B2 and B3.Due in the direction of arrow shown in Fig. 5, carbon carrying capacity value increases progressively from 0 to a direct proportion, therefore, the carbon carrying capacity value that region B1 is corresponding is a/3, the carbon carrying capacity value that region B2 is corresponding is 2a/3, and the carbon carrying capacity value that region B3 is corresponding is a, or carbon carrying capacity value corresponding to region B1 is 0, the carbon carrying capacity value that region B2 is corresponding is a/3, and the carbon carrying capacity value that region B3 is corresponding is 2a/3.Here be described using decile as preferred embodiment, when specifically dividing, also can not decile, do not affect enforcement of the present invention.
Inventor finds, the point that actual each calibration value recorded is corresponding is approximately straight line, but be not straight line strictly, the execution of the round and smooth curve that each calibration line therefore in the embodiment of the present invention can be linked to be for corresponding point, the broken line be linked to be or matching.Therefore several mode divided the region between calibration line is provided in the present embodiment.For two adjacent calibration lines, at the point that relatively little carbon carrying capacity calibration value is corresponding, the straight line obtained to the point that the carbon carrying capacity calibration value according to relatively large is corresponding makes vertical line.If all vertical lines obtained are divided into individual point, the point of the correspondence of division are linked to be a curve or broken line, thus obtain corresponding zoning.Such as, as shown in Figure 5, for carbon carrying capacity calibration value be 0 and carbon carrying capacity calibration value be the calibration line that two of a are adjacent, by the point that carbon carrying capacity calibration value is 0 correspondence, to being that the straight line that point that a is corresponding obtains does vertical line according to carbon carrying capacity calibration value, here, the distance variance sum of this straight line obtained can be distance carbon carrying capacity calibration value be point that a is corresponding is minimum, or the straight line that distance sum is minimum.Vertical line is carried out trisection, obtains trisection point, corresponding Along ent is connected, obtain region B1, B2 and B3.Here, may not be and make vertical line by the point of carbon carrying capacity calibration value 0 correspondence, but several points on the line formed by these points do vertical line, may not be and make vertical line by the point of carbon carrying capacity calibration value 0 correspondence to the straight line obtained according to carbon carrying capacity calibration value a, but make vertical line by the point that carbon carrying capacity calibration value a is corresponding to the straight line obtained according to carbon carrying capacity calibration value 0.Similarly, if can be individual region by C, D and E Region dividing, and if the individual region divided is demarcated, thus obtain complete carbon carrying capacity MAP.
It should be noted that, in the region that the positive axis of positive axis and pressure reduction coordinate axis that regions all in the present embodiment is air speed coordinate axis forms.
In fact, air speed when the actual carbon carrying capacity of the step S301 measurement DPF in the present embodiment is each carbon carrying capacity calibration value and pressure reduction, air speed when the actual carbon carrying capacity of step S303 measurement DPF is maximum carbon carrying capacity limit value and pressure reduction, the execution sequence of two steps does not limit, can perform simultaneously, can be identical with the present embodiment, first perform S301, also first can perform S303.Further, the execution sequence of step S304 and step S305 also not circumscribed.In embodiments of the present invention, only need meet and perform step S302 after step S301, and perform S304 and S305 after step S303.
Known by technique scheme, in the present embodiment, not only calibrate the region that maximum carbon carrying capacity limit value is corresponding, also calibrate the calibration line that each carbon carrying capacity calibration value is corresponding, utilize the progressive law summed up, the carbon carrying capacity value corresponding to the region between each calibration line is demarcated, thus completes carbon carrying capacity MAP.Make it possible to the air speed according to the actual DPF recorded and pressure reduction, in carbon carrying capacity MAP, find corresponding carbon carrying capacity value.And, air speed corresponding to limited carbon carrying capacity calibration value and pressure reduction only need be measured in the present embodiment, and utilize the carbon carrying capacity value of progressive law to all the other regions to demarcate, this mode without the need to measuring air speed corresponding to all carbon carrying capacity calibration values and pressure reduction, not only workload is less, and the result coverage rate measured is also larger.
Preferably, described method can also comprise: when described carbon carrying capacity calibration value comprises 0, the carbon carrying capacity value that calibration line corresponding when being 0 by carbon carrying capacity calibration value is corresponding with the region that the positive axis of air speed coordinate axis forms is demarcated as 0.In figures 4 and 5, the carbon carrying capacity value that region A is corresponding is 0.
The region that when carbon carrying capacity calibration value is 0, the positive axis of corresponding calibration line and air speed coordinate axis forms refers to, the angle that the positive axis of air speed coordinate axis and this calibration line composition one are less than 90 °, this be less than the angle of 90 ° right meet the region that pressure reduction and air speed are all greater than 0.
In step s 304, during several regions of Region dividing between the calibration line adjacent by each, it can be the region being divided into several equal numbers, that is, region between any two adjacent calibration lines is divided into the region of some, and the region quantity of Region dividing between any two adjacent calibration lines is identical.Then at the calibration line of the minimum carbon carrying capacity calibration value of correspondence on the direction of the calibration line of correspondence maximum carbon carrying capacity limit value, carbon carrying capacity value equal difference corresponding to each region divided increases progressively.
Utilize the region that the present embodiment is demarcated out, can judge whether corresponding carbon carrying capacity reaches or close to carbon carrying capacity threshold limit value, namely carry out initiative regeneration the need of to DPF according to the current air speed of DPF and pressure reduction.Particularly, can also comprise after the described method of the present embodiment: measure the current air speed of DPF and pressure reduction; According to the current air speed recorded and pressure reduction, find the region belonging to described air speed pressure reduction coordinate system, obtain carbon carrying capacity value corresponding to this region as current carbon carrying capacity value; When described carbon carrying capacity value be maximum carbon carrying capacity limit value or be less than preset difference value with the difference of maximum carbon carrying capacity limit value time, initiative regeneration is carried out to DPF.
In the present embodiment, when the actual carbon carrying capacity that step S301 and step S302 measures DPF is specially each carbon carrying capacity calibration value and maximum carbon carrying capacity limit value, the air speed under the operating point of universal characteristic and pressure reduction.In order to make Measuring Time the shortest, a fresh DPF can be selected to carry out filtration treatment to the tail gas of diesel engine, by choosing an exhaust smoke larger operating mode, carbon distribution is carried out to DPF, the carbon carrying capacity in DPF is made to reach corresponding a, b, c, d numerical value, therefore, it is possible to according to carbon carrying capacity order from small to large, measure each carbon carrying capacity calibration value and air speed corresponding to maximum carbon carrying capacity limit value and pressure reduction successively.An embodiment is provided to introduce this situation in detail below.In the following embodiments, represent that flow is illustrated for air speed.
Refer to Fig. 6, the invention provides the 3rd embodiment of the carbon carrying capacity scaling method for DPF, Fig. 7 is a kind of active regeneration system provided by the invention, below for the DPF in the present embodiment for the DPF701 in the system shown in Fig. 7 is illustrated.As shown in Figure 7, diesel engine 702 uses the DPF701 in the present embodiment.Before the method adopting the present embodiment, DPF701 is fresh state, and namely carbon carrying capacity is the state of 0.
Described method comprises:
S601: be more than or equal to 0, and optional at least one number in the interval being less than described maximum carbon carrying capacity limit value, using at least one number of choosing as carbon carrying capacity calibration value.Such as, choose 0, a, b, c as carbon carrying capacity calibration value, wherein, 0, a, b, c be all less than the maximum carbon carrying capacity limit value d of DPF.According to carbon carrying capacity calibration value order from small to large, when the actual carbon carrying capacity measuring DPF701 is successively specially each carbon carrying capacity calibration value, air speed under the operating point of universal characteristic test and pressure reduction, when the actual carbon carrying capacity finally measuring DPF701 is specially maximum carbon carrying capacity limit value, the air speed under the operating point of universal characteristic test and pressure reduction.
In the present embodiment, measure according to carbon carrying capacity calibration value order from small to large, therefore DPF701 is in carbon distribution state, the actual carbon carrying capacity of DPF701 is increased along with the increase of working time, thus reach each carbon carrying capacity calibration value successively, the actual carbon carrying capacity value of DPF can be calculated by routine weighing.In order to make DPF701 can carbon distribution fast, diesel engine 702 is preferably operated in the larger operating point of exhaust smoke, and in order to make DPF701 can not carry out passive regeneration because temperature is too high, therefore diesel engine 702 is preferably operated in the lower operating point of delivery temperature.Therefore, consider, diesel engine 702 is operated in delivery temperature and exhaust smoke meets pre-conditioned operating point.As shown in Figure 7, delivery temperature can be measured by the temperature sensor being arranged on gas outlet turbosupercharger rear end by DCU703.DCU703 can measure air intake opening T1 and the air outlet temperature T2 of diesel oxidation catalyst (DOC) 710 respectively by temperature sensor 707 and temperature sensor 708.After carrying out initiative regeneration, owing to there occurs oxidation reaction in DOC710, diesel combustion heat release, air outlet temperature T2 can far above air inlet temperature T1.The foundation of air inlet temperature T1 oil spout mainly as whether, can oxidized heat release because only have air intake opening T1 to reach after certain numerical value fuel oil, just can carry out initiative regeneration; For air outlet temperature T2, when being mainly used in monitoring initiative regeneration, temperature in DPF, increases distributive value time too low, stops oil spout time too high.
When measuring, diesel engine 702 is in running order, and therefore DPF701 is in carbon distribution state.Wherein, when measuring the air speed of each actual carbon carrying capacity and pressure reduction, can according to diesel engine rotating speed from low to high, every speed time load ascending order, measure the air speed under each operating point and pressure reduction successively.When measuring pressure reduction, as shown in Figure 7, can be measure pressure reduction between the air intake opening of DPF701 and gas outlet by refresh controller (DCU) 703 by differential pressure pickup before and after DPF 709.
S602: the air speed recorded when the actual carbon carrying capacity recorded is specially either carbon carrying capacity calibration value and pressure reduction, the carbon carrying capacity value of point corresponding in air speed pressure reduction coordinate system is demarcated as this carbon carrying capacity calibration value.
S603: in air speed pressure reduction coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value, and be several regions by the Region dividing between each adjacent calibration line, utilizing the progressive law that the carbon carrying capacity value of some correspondences all in described coordinate system has, is corresponding carbon carrying capacity value by several region labelings divided.
Described progressive law is specially for two adjacent calibration lines, at the calibration line that the carbon carrying capacity calibration value of correspondence is relatively little, to on the direction of relatively large calibration line, the carbon carrying capacity calibration value relatively little by this, increases progressively to relatively large carbon carrying capacity calibration value direct proportion; Wherein, in air speed pressure reduction coordinate system, the line that the point of corresponding same carbon carrying capacity calibration value is formed is specially calibration line corresponding to this carbon carrying capacity calibration value.The calibration line of described correspondence maximum carbon carrying capacity limit value is the line that the point of air speed and the pressure reduction correspondence in air speed pressure reduction coordinate system recorded is formed.Here, the straight line of the round and smooth curve that the line that the point of described correspondence is formed can be linked to be for corresponding point or the broken line be linked to be or the some matching according to correspondence.
Known by technique scheme, in the present embodiment, DPF is in carbon distribution state, the actual carbon carrying capacity of DPF is from fresh state, continuous carbon distribution, to each carbon carrying capacity calibration value, when carbon distribution is to each carbon carrying capacity calibration value, measures air speed and the pressure reduction of the operating point under universal characteristic test.
Preferably, described method can also comprise: when described carbon carrying capacity calibration value comprises 0, the carbon carrying capacity value that calibration line corresponding when being 0 by carbon carrying capacity calibration value is corresponding with the region that the positive axis of air speed coordinate axis forms is demarcated as 0.
In step S603, during several regions of Region dividing between the calibration line adjacent by each, it can be the region being divided into several equal numbers, then at the calibration line of the minimum carbon carrying capacity calibration value of correspondence on the direction of the calibration line of correspondence maximum carbon carrying capacity limit value, carbon carrying capacity value direct proportion corresponding to each region divided increases progressively.
Utilize the region that the present embodiment is demarcated out, can judge whether corresponding carbon carrying capacity reaches or close to carbon carrying capacity threshold limit value, namely carry out initiative regeneration the need of to DPF according to the current air speed of DPF701 and pressure reduction.Particularly, can also comprise after the described method of the present embodiment: measure the current air speed of DPF701 and pressure reduction; According to the current air speed recorded and pressure reduction, find the region belonging to described air speed pressure reduction coordinate system, obtain carbon carrying capacity value corresponding to this region as current carbon carrying capacity value; When described carbon carrying capacity value be maximum carbon carrying capacity limit value or be less than preset difference value with the difference of maximum carbon carrying capacity limit value time, initiative regeneration is carried out to DPF.When initiative regeneration is carried out to DPF, as shown in Figure 7, can be the fuel oil that certain pressure is provided to fuel injection unit 706 by DCU703 control fuel delivery unit 705, and DCU703 control fuel injection unit 706 fuel injected.Wherein, by fuel delivery unit 705 by the fuel delivery fuel injection unit 706 in fuel tank 704.Here, indeed through diesel low-voltage oil circuit by the fuel delivery fuel injection unit 706 in fuel tank 704.When after fuel injection unit 706 fuel injected, fuel oil produces heat after being oxidized by diesel oxidation catalyst (DOC) 710 makes temperature improve, thus the particulate deposited on DPF701 just at high temperature oxidized burning, thus realize the regeneration of DPF.In the figure 7, DCU703 also needs the operation conditions sended over according to diesel engine (ECU) 711, is responsible for judging whether to regenerate.
Refer to Fig. 8, present invention also offers the specific embodiment of the carbon carrying capacity calibration system for DPF, in the present embodiment, described system comprises: measurement mechanism 801 and caliberating device 802.
Measurement mechanism 801, when the actual carbon carrying capacity for measuring DPF is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction.
Caliberating device 802, in flow pressure-difference coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value.
Wherein, described flow is the exhaust volume flow of described DPF, and described pressure reduction is the air intake opening of DPF and the draught head of exhausr port; The calibration line of described correspondence maximum carbon carrying capacity limit value is the line that the point of flow and the pressure reduction correspondence in flow pressure-difference coordinate system recorded is formed.
Pressure reduction in the present embodiment can be detected by differential pressure pickup before and after DPF and obtain.Flow in the present embodiment is the exhaust volume flow of DPF.Exhaust volume flow Q
vcan be calculated by following formula:
Q
v=[（Q
m1+Q
m2）×RT]/(MP)
Wherein, air-mass flow Q
m1, the fuel consume quality Q of diesel engine in the unit interval
m2, delivery temperature T and DPF be vented air pressure P and all can directly record, exhaust molecular weight M and R is constant.Therefore, it is possible to obtain exhaust volume flow Q
vvalue.
Also described flow can be represented by air speed, namely the exhaust volume flow of described DPF in the present embodiment.Air speed is the exhaust volume flow of the unit carrier bulk of DPF, i.e. air speed ν=Q
v/ V', wherein Q
vfor exhaust volume flow, V' is the carrier bulk of DPF, is definite value for fixing DPF.Flow pressure-difference coordinate system then now in the present embodiment is specially air speed pressure reduction coordinate system.
Preferably, be more than or equal to 0, and optional at least one number in the interval being less than described maximum carbon carrying capacity limit value, using at least one number of choosing as carbon carrying capacity calibration value.
Then described measurement mechanism 801 also for, measure the actual carbon carrying capacity of DPF when being specially each carbon carrying capacity calibration value, the flow under the operating point of universal characteristic test and pressure reduction.
And described caliberating device 802 also for, the flow recorded when the actual carbon carrying capacity recorded is specially either carbon carrying capacity calibration value and pressure reduction, the carbon carrying capacity value of point corresponding in flow pressure-difference coordinate system is demarcated as this carbon carrying capacity calibration value; In flow pressure-difference coordinate system, the line that the point of corresponding same carbon carrying capacity calibration value is formed is specially calibration line corresponding to this carbon carrying capacity calibration value; Region dividing between the calibration line adjacent by each is several regions, utilizes the progressive law that the carbon carrying capacity value of some correspondences all in described coordinate system has, and is corresponding carbon carrying capacity value by several region labelings divided.
Wherein, described progressive law is specially for two adjacent calibration lines, at the calibration line that the carbon carrying capacity calibration value of correspondence is relatively little, on the direction of relatively large calibration line, the carbon carrying capacity calibration value relatively little by this, increases progressively to relatively large carbon carrying capacity calibration value direct proportion.
Preferably, described caliberating device is also for when described carbon carrying capacity calibration value comprises 0, and the carbon carrying capacity value that calibration line corresponding when being 0 by carbon carrying capacity calibration value is corresponding with the region that the positive axis of flow coordinate axis forms is demarcated as 0.
Preferably, described by the Region dividing between each adjacent calibration line for several regions are specially: the region between the calibration line adjacent by each is divided into the region of several equal numbers;
Then at the calibration line of the minimum carbon carrying capacity calibration value of correspondence on the direction of the calibration line of correspondence maximum carbon carrying capacity limit value, carbon carrying capacity value equal difference corresponding to each region divided increases progressively.
Preferably, when the actual carbon carrying capacity of measurement DPF is specially each carbon carrying capacity calibration value, when the actual carbon carrying capacity of the flow under the operating point of universal characteristic test and pressure reduction and measurement DPF is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction are specially:
According to carbon carrying capacity calibration value order from small to large, when the actual carbon carrying capacity measuring DPF is successively specially each carbon carrying capacity calibration value, flow under the operating point of universal characteristic test and pressure reduction, finally measure actual carbon carrying capacity when being specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction.
Preferably, the flow under the operating point tested at universal characteristic of described measurement and pressure reduction are specially:
According to diesel engine rotating speed order from low to high and when every speed, the order that load is ascending, measures the flow under each operating point and pressure reduction successively.
Preferably, described system also comprises: regenerating unit.
Described measurement mechanism is also for measuring the current flow of DPF and pressure reduction;
Described regenerating unit also for according to the current flow recorded and pressure reduction, finds the region belonging to described flow pressure-difference coordinate system, obtains carbon carrying capacity value corresponding to this region as current carbon carrying capacity value; When described carbon carrying capacity value is maximum carbon carrying capacity limit value, initiative regeneration is carried out to DPF.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (8)
1., for a carbon carrying capacity scaling method for diesel particulate filter, it is characterized in that, described method comprises:
Measure when the actual carbon carrying capacity of diesel particulate filter is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction; Described flow is the exhaust volume flow of described diesel particulate filter, and described pressure reduction is the air intake opening of described diesel particulate filter and the draught head of exhausr port;
In flow pressure-difference coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value;
Wherein, the calibration line of described correspondence maximum carbon carrying capacity limit value is the line of the some formation of flow and the pressure reduction correspondence in flow pressure-difference coordinate system recorded;
Described method also comprises:
Be more than or equal to 0, and optional at least one number in the interval being less than described maximum carbon carrying capacity limit value, using at least one number of choosing as carbon carrying capacity calibration value, when the actual carbon carrying capacity of measurement diesel particulate filter is specially each carbon carrying capacity calibration value, the flow under the operating point of universal characteristic test and pressure reduction;
The flow recorded when the actual carbon carrying capacity recorded is specially either carbon carrying capacity calibration value and pressure reduction, the carbon carrying capacity value of point corresponding in flow pressure-difference coordinate system is demarcated as this carbon carrying capacity calibration value;
In flow pressure-difference coordinate system, the line that the point of corresponding same carbon carrying capacity calibration value is formed is specially calibration line corresponding to this carbon carrying capacity calibration value;
Region dividing between the calibration line adjacent by each is several regions, utilize the progressive law that the carbon carrying capacity value of some correspondences all in described coordinate system has, by the carbon carrying capacity value that several region labelings divided are corresponding, described progressive law is specially for two adjacent calibration lines, at the calibration line that the carbon carrying capacity calibration value of correspondence is relatively little, to on the direction of relatively large calibration line, the carbon carrying capacity calibration value relatively little by this, increases progressively to relatively large carbon carrying capacity calibration value direct proportion.
2. method according to claim 1, it is characterized in that, described method also comprises: when described carbon carrying capacity calibration value comprises 0, the carbon carrying capacity value that calibration line corresponding when being 0 by carbon carrying capacity calibration value is corresponding with the region that the positive axis of flow coordinate axis forms is demarcated as 0.
3. method according to claim 1, is characterized in that,
Described by the Region dividing between each adjacent calibration line for several regions are specially: the region between the calibration line adjacent by each is divided into the region of several equal numbers;
Then at the calibration line of the minimum carbon carrying capacity calibration value of correspondence on the direction of the calibration line of correspondence maximum carbon carrying capacity limit value, carbon carrying capacity value equal difference corresponding to each region divided increases progressively.
4. method according to claim 1, is characterized in that,
When the actual carbon carrying capacity of measurement diesel particulate filter is specially each carbon carrying capacity calibration value, when the actual carbon carrying capacity of the flow under the operating point of universal characteristic test and pressure reduction and measurement diesel particulate filter is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction are specially:
According to carbon carrying capacity calibration value order from small to large, when the actual carbon carrying capacity measuring diesel particulate filter is successively specially each carbon carrying capacity calibration value, flow under the operating point of universal characteristic test and pressure reduction, finally measure actual carbon carrying capacity when being specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction.
5. method according to claim 1, is characterized in that, the flow under the operating point that described measurement is tested at universal characteristic and pressure reduction are specially:
According to diesel engine rotating speed order from low to high and when every speed, the order that load is ascending, measures the flow under each operating point and pressure reduction successively.
6. method according to claim 1, is characterized in that, also comprises after described method:
Measure the current flow of diesel particulate filter and pressure reduction;
According to the current flow recorded and pressure reduction, the region belonging to finding in described flow pressure-difference coordinate system, using carbon carrying capacity value corresponding for this region as current carbon carrying capacity value;
If when current carbon carrying capacity value is maximum carbon carrying capacity limit value, carry out initiative regeneration to diesel particulate filter.
7. method according to claim 1, is characterized in that, described flow is represented by air speed, and described air speed is the exhaust volume flow of the unit carrier bulk of described diesel particulate filter,
Then described flow pressure-difference coordinate system is specially air speed pressure reduction coordinate system.
8., for a carbon carrying capacity calibration system for diesel particulate filter, it is characterized in that, described system comprises:
Measurement mechanism, when the actual carbon carrying capacity for measuring diesel particulate filter is specially maximum carbon carrying capacity limit value, the flow under the operating point of universal characteristic test and pressure reduction;
Caliberating device, in flow pressure-difference coordinate system, carbon carrying capacity value corresponding to the region positive axis of pressure reduction coordinate axis and the calibration line of corresponding maximum carbon carrying capacity limit value formed is demarcated as described maximum carbon carrying capacity limit value;
Wherein, described flow is the exhaust volume flow of described diesel particulate filter, and described pressure reduction is the air intake opening of diesel particulate filter and the draught head of exhausr port; The calibration line of described correspondence maximum carbon carrying capacity limit value is the line that the point of flow and the pressure reduction correspondence in flow pressure-difference coordinate system recorded is formed;
Be more than or equal to 0, and optional at least one number in the interval being less than described maximum carbon carrying capacity limit value, using at least one number of choosing as carbon carrying capacity calibration value;
Described measurement mechanism also for, measure the actual carbon carrying capacity of diesel particulate filter when being specially each carbon carrying capacity calibration value, the flow under the operating point of universal characteristic test and pressure reduction;
Described caliberating device also for, the flow recorded when the actual carbon carrying capacity recorded is specially either carbon carrying capacity calibration value and pressure reduction, the carbon carrying capacity value of point corresponding in flow pressure-difference coordinate system is demarcated as this carbon carrying capacity calibration value; In flow pressure-difference coordinate system, the line that the point of corresponding same carbon carrying capacity calibration value is formed is specially calibration line corresponding to this carbon carrying capacity calibration value; Region dividing between the calibration line adjacent by each is several regions, utilizes the progressive law that the carbon carrying capacity value of some correspondences all in described coordinate system has, and is corresponding carbon carrying capacity value by several region labelings divided;
Wherein, described progressive law is specially for two adjacent calibration lines, at the calibration line that the carbon carrying capacity calibration value of correspondence is relatively little, on the direction of relatively large calibration line, the carbon carrying capacity calibration value relatively little by this, increases progressively to relatively large carbon carrying capacity calibration value direct proportion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310451299.8A CN103528916B (en) | 2013-09-27 | 2013-09-27 | A kind of carbon carrying capacity scaling method for diesel particulate filter and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310451299.8A CN103528916B (en) | 2013-09-27 | 2013-09-27 | A kind of carbon carrying capacity scaling method for diesel particulate filter and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103528916A CN103528916A (en) | 2014-01-22 |
| CN103528916B true CN103528916B (en) | 2016-02-10 |
Family
ID=49931107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310451299.8A Active CN103528916B (en) | 2013-09-27 | 2013-09-27 | A kind of carbon carrying capacity scaling method for diesel particulate filter and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103528916B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104864946A (en) * | 2015-03-31 | 2015-08-26 | 凯龙高科技股份有限公司 | Weighing method for soot loading of DPF |
| CN106121795B (en) * | 2016-07-29 | 2018-11-06 | 安徽江淮汽车集团股份有限公司 | The detection method of diesel engine DPF carbon accumulation amounts |
| CN108087071B (en) * | 2017-12-05 | 2021-09-28 | 南京依柯卡特排放技术股份有限公司 | Method for judging carbon loading of DPF |
| CN108152041A (en) * | 2017-12-26 | 2018-06-12 | 潍柴动力股份有限公司 | A kind of carbon distribution model experiment condition control method and device |
| CN108647430B (en) * | 2018-05-09 | 2022-02-08 | 中国重汽集团济南动力有限公司 | DPF carbon loading calculation method |
| CN109798172B (en) * | 2019-01-22 | 2020-06-02 | 同济大学 | Carbon loading capacity measuring device of diesel engine particle trapping device |
| CN111796582B (en) * | 2020-07-16 | 2022-02-08 | 江铃汽车股份有限公司 | Remote monitoring and optimizing method for GPF removal diagnosis of gasoline motor car |
| CN113606025B (en) * | 2021-08-20 | 2022-11-22 | 一汽解放汽车有限公司 | Fault diagnosis method for diesel engine DPF trapping efficiency |
| CN113866350B (en) * | 2021-08-30 | 2024-01-23 | 东风柳州汽车有限公司 | Method, device, equipment and storage medium for realizing vehicle accumulated carbon quantity |
| CN117171921B (en) * | 2023-11-02 | 2024-01-30 | 上海市环境科学研究院 | Method and device for evaluating and processing health state of diesel particulate tail gas purification device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1526924A (en) * | 2003-03-07 | 2004-09-08 | 日产自动车株式会社 | Engine waste gas pwrifying equipment |
| CN1757886A (en) * | 2004-08-06 | 2006-04-12 | 日产自动车株式会社 | The estimation device of the particulate matter deposit amount of diesel soot filter and projectional technique |
| CN103016104A (en) * | 2012-12-26 | 2013-04-03 | 潍柴动力股份有限公司 | Method and device for calculating cumulated amount of carbon |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9169765B2 (en) * | 2008-07-14 | 2015-10-27 | Westport Power Inc. | Method for regenerating a diesel particulate filter |
-
2013
- 2013-09-27 CN CN201310451299.8A patent/CN103528916B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1526924A (en) * | 2003-03-07 | 2004-09-08 | 日产自动车株式会社 | Engine waste gas pwrifying equipment |
| CN1757886A (en) * | 2004-08-06 | 2006-04-12 | 日产自动车株式会社 | The estimation device of the particulate matter deposit amount of diesel soot filter and projectional technique |
| CN103016104A (en) * | 2012-12-26 | 2013-04-03 | 潍柴动力股份有限公司 | Method and device for calculating cumulated amount of carbon |
Non-Patent Citations (2)
| Title |
|---|
| 《Experimental Studies on Pressure Drop Performance and Regeneration Safety of Diesel Particulate Filter》;WANG Dan et al.;《IEEE》;20111231;第1-4页 * |
| 《柴油机微粒捕集器及再生技术研究》;王丹;《中国博士学位论文全文数据库》;20130815(第08期);第30页第1段，第57页第2段到第60页第1段，图4.7-4.8 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103528916A (en) | 2014-01-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103528916B (en) | A kind of carbon carrying capacity scaling method for diesel particulate filter and system | |
| CN109184872A (en) | A kind of judgment method on the diesel engine dpf regeneration opportunity based on carbon carrying capacity | |
| CN104863679B (en) | DPF system carbon loading capacity estimation and blocking state judgment method | |
| CN104832258B (en) | A kind of diesel engine particle catcher DPF carbon accumulation amount estimation methods | |
| CN101988440B (en) | Method for controlling oil injection of diesel engine | |
| CN101091038B (en) | Exhaust emission control device and internal combustion engine equipped with the exhaust emission control device and particulate filter regenerating method | |
| CN102869860B (en) | DPF failure detection method and DPF failure detection device | |
| CN102162403B (en) | System and method for estimating airflow restriction of an engine air filter | |
| US20110252961A1 (en) | Particulate Filter Regeneration | |
| CN106121795B (en) | The detection method of diesel engine DPF carbon accumulation amounts | |
| WO2011106291A1 (en) | Systems and methods for determining a particulate load in a particulate filter | |
| CN106837496B (en) | Engine particulate purifying regeneration control system | |
| CN105556082A (en) | Diagnostic device | |
| CN102278222A (en) | Tail gas aftertreatment system and method for diesel engine | |
| WO2015171059A1 (en) | Method and system for monitoring of a physical quantity related to a particulate mass in at least one exhaust pipe | |
| CN104847455B (en) | Gasoline engine particulate filter regenerative system and regeneration method | |
| CN105089757A (en) | Method and apparatus for detecting soot and ash loading of a particle filter | |
| CN105089759A (en) | Method and apparatus for diagnosis of detachment of assembly of exhaust cleaning component | |
| CN104047741A (en) | Method for controlling EGR system in a hybrid vehicle | |
| CN106762061B (en) | Diagnostic device and method for simulating DPF failure | |
| US9394815B2 (en) | Method and device for metering the additive for regenerating a diesel particulate filter | |
| CN101512129A (en) | Low-idle exhaust gas recirculation system | |
| CN102251856A (en) | Synchronous automatic measurement device and method for air-fuel ratio of compressed natural gas engine | |
| EP2825755A1 (en) | Method for enriching exhaust gases with unburnt hydrocarbon | |
| CN112814793A (en) | Engine air inlet signal correction method, device and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |