CN102840020A - Measuring device for regeneration point of diesel engine exhaust filter - Google Patents
Measuring device for regeneration point of diesel engine exhaust filter Download PDFInfo
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- CN102840020A CN102840020A CN2011101664773A CN201110166477A CN102840020A CN 102840020 A CN102840020 A CN 102840020A CN 2011101664773 A CN2011101664773 A CN 2011101664773A CN 201110166477 A CN201110166477 A CN 201110166477A CN 102840020 A CN102840020 A CN 102840020A
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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
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
A measuring device for a regeneration point of a diesel engine exhaust filter is used for judging the regeneration point of the diesel engine exhaust filter, so as to regenerate the filter in time. The measuring device comprises a gas inlet pipe, an exhaust filter, a pressure sensor, electric valves (21 and 31) and a pressure detector which is used for detecting pressure and judging the regeneration point, wherein the exhaust filter is connected with the gas inlet pipe by the electric valve (21); the pressure sensor is mounted on the gas inlet pipe; the measuring device is characterized by further comprising a pressure reference tube with a certain resistance coefficient; and the pressure reference tube is connected with the gas inlet pipe by the electric valve (31). A measuring method is performed by alternately measuring and comparing pressures of the pressure reference tube and a filtering ceramic, so as to judge the regeneration point. The measuring device for the regeneration point of the diesel engine exhaust filter has the advantages as follows: errors (such as different diesel engine conditions, different models, different wearing degrees and so on) caused by factors can be counteracted; the regeneration point is accurately judged; and convenience for mounting and debugging in vehicle remodeling places is achieved.
Description
Technical field
A kind of measuring device of diesel engine vent gas filter regeneration point
,Be used for diesel engine automobile exhaust gas filter regenerating point is judged, so that in time described filter is regenerated.
Background technique
Existing technology generally adopts wall-flow ceramic filter to filter to the particle of exhaust emissions of diesel engine; When the particle in the porcelain filter runs up to when a certain amount of; When promptly arriving regenerating point, porcelain filter is regenerated, through heating, burning clearance of particles so that filter once more.Described regenerating point must have a suitable scope, and it is insufficient to cross low burning, can make the ceramic for filtration damage when crossing high combustion, and described regenerating point can draw through test.Because the particle accumulation in the ceramic for filtration can not directly be measured; So existing technology to the judgement of regenerating point generally through isoparametric measurement calculates then to the pressure difference of diesel engine speed, delivery temperature and porcelain filter; Because the abrasion condition of the operating mode and diesel engine self of diesel engine is different; Different diesel engines there is error according to the particle accumulation that same formula calculates with actual particle accumulation, can not accurately judges regenerating point.
Application number is 2007101398868 patent of invention " exhaust purifier "; Come the count particles accumulation according to the revolution of operating range, diesel engine, the pressure difference of ceramic for filtration, the load parameters such as (load of diesel engine are relevant with delivery temperature) of diesel engine; A result of calculation and a judgment value are compared, confirm regenerating point.For getting rid of error of calculations; When particle burning, measure FT, a particle burning maximum temperature and a setting temperature are compared, when FT reduces judgment value during greater than setting temperature;, FT increases judgment value when setting less than temperature, to obtain suitable next time regenerating point.But after need be after exhaust purifier is installed when the preset judgment value diesel engine runnability repeatedly being tested for different diesel engines, could set inconvenient debugging.Revise judgment value according to the particle burning temperature in addition; Must get rid of other factors of FT that influence, for example the particle burning temperature remove with how much the having of particle accumulation outside the Pass during also with burning air inflow relevant, the device that therefore must have pair air inflow reliably to control; This is concerning original diesel engine automobile; When increasing this purifier of dress, also intake-air quantity control apparatus need be installed, installation workload is big, inconvenient.
Summary of the invention
The present invention proposes a kind of measuring device of diesel engine vent gas filter regeneration point to the existing technology deficiency; The technical problem that solves is the regenerating point error of calculations that the factors such as operating mode, wearing and tearing and diesel engine individual difference of eliminating diesel engine are brought, and measures accurately whether the particle accumulation reaches regenerating point in the ceramic for filtration; Reduce the kind of sensor, the convenient installation; , exhaust gas filter can confirm to judge the setting value of regenerating point before using, convenient debugging.
The structure of measuring device comprises: suction tude 1, exhaust gas filter 2, pressure transducer 4, mortor operated valve 21,31, detected pressures are also judged the pressure detecting instrument 5 of regenerating point; Two output terminals of input termination pressure transducer 4 pressure detecting instruments 5 of pressure detecting instrument 5 connect mortor operated valve 21,31 respectively; Described exhaust gas filter 2 is connected with suction tude 1 through mortor operated valve 21; Described pressure transducer 4 is contained on the suction tude 1; It is characterized in that: described measuring device also comprises the pressure reference pipe 3 with certain resistance coefficient, and pressure reference pipe 3 is connected with suction tude 1 through mortor operated valve 31.
Learn that through test the regenerating point error that draws in 100% to 110% scope of the resistance coefficient of resistance coefficient when described exhaust gas filter reaches regenerating point of described pressure reference pipe is minimum.
Described pressure detecting instrument 5 mainly comprises: current/voltage-converted unit, D/A switch unit, single-chip microcomputer; Power amplification unit; The output terminal 50 of pressure transducer connects the input end 51 of current/voltage-converted unit; Its output terminal 52 connects the input end 53 of D/A switch unit, and the output terminal 54 of D/A switch unit connects the input end 55 of single-chip microcomputer, and the output terminal 56,57 of single-chip microcomputer connects the input end 56 ', 57 ' of power amplification unit respectively; The output terminal 58,59 of power amplification unit connects mortor operated valve 21,31 respectively, and described single-chip microcomputer also comprises the output terminal 60 of an output regeneration cue.
The beneficial effect that the present invention compared with prior art has is: can know the switching of tail gas in the mortor operated valve 21 may command exhaust gas filters 2 according to the structure of described measuring device; The switching of tail gas in the mortor operated valve 31 may command pressure reference pipes 3; When mortor operated valve 21 is opened, when mortor operated valve 31 cuts out, the pressure that pressure detecting instrument 5 is measured through pressure transducer 4 is filter pressure; When mortor operated valve 21 cuts out, when mortor operated valve 31 is opened, the pressure that pressure detecting instrument 5 is measured through pressure transducer 4 is reference pressure; Pressure reference pipe 3 is filtering particle not, and it is that its resistance coefficient can not change that pressure reference pipe can not change the resistance of tail gas; And exhaust gas filter can change owing to its resistance coefficient of filtering particle in time; Exhaust flow, temperature-resistant when diesel engine condition is stablized, alternately the pressure of measurement and comparative pressure reference pipe and ceramic for filtration can be judged regenerating point; Because the resistance coefficient of pressure reference pipe is constant; The actual of described reference pressure and filter pressure is the comparison of two resistance coefficients; Therefore can offset the error that factors such as diesel engine condition difference, individual difference are brought, thereby regenerating point is judged accurately.
The sensor that uses is few, and is easy for installation concerning the occasion of vehicle refitting.
Because the resistance coefficient of pressure reference pipe is a constant and the resistance coefficient when reaching regenerating point with exhaust gas filter one proportionate relationship is arranged; Therefore when the setting value of preset judgement regenerating point; Need not to consider the difference of diesel engine individuality; Can directly confirm according to the specification of ceramic for filtration and the size of pressure reference pipe, need not field adjustable.
Description of drawings
Fig. 1 is a diesel engine vent gas filter regeneration point measurement apparatus structure schematic representation of the present invention.
Fig. 2 is the pressure detecting instrument block diagram of diesel engine vent gas filter regeneration point measurement device of the present invention.
Fig. 3 is a diesel engine vent gas filter regeneration point measurement method flow diagram of the present invention.
Fig. 4 confirms method flow diagram the stand-by period of f step among Fig. 3 automatically.
Embodiment
Existing accompanying drawings embodiment of the present invention:
The structure of measuring device comprises: suction tude 1, exhaust gas filter 2, pressure transducer 4, mortor operated valve 21,31, detected pressures are also judged the pressure detecting instrument 5 of regenerating point; Described exhaust gas filter 2 is connected with suction tude 1 through mortor operated valve 21; Described pressure transducer 4 is contained on the suction tude 1; It is characterized in that: described measuring device also comprises the pressure reference pipe 3 with certain resistance coefficient, and pressure reference pipe 3 is connected with suction tude 1 through mortor operated valve 31.
The resistance coefficient of described exhaust gas filter main with exhaust gas filter in the particle accumulation of ceramic for filtration 22 relevant, particle accumulates that many more resistance coefficients are big more, vice versa, its resistance coefficient is a variable; The internal diameter and the length of the main reducer pipe 32 with pressure reference pipe of the resistance coefficient of described pressure reference pipe are relevant, and in length one regularly, its internal diameter slight drag coefficient more is big more, and vice versa, and its resistance coefficient is a constant after its internal diameter is definite; When exhaust gas filter reaches regenerating point and the flow of diesel engine vent gas and temperature at this moment between section remain unchanged; Tail gas stream is crossed the pressure of filter generation and the ratio of the pressure that tail gas stream excess pressure reference pipe produces should be a constant, and this constant can be used as the setting value K ' that judges regenerating point.
The value of the resistance coefficient of pressure reference pipe is respectively 0.5,0.8,1.0,1.2,1.5 of the resistance coefficient of exhaust gas filter when reaching regenerating point; On test-bed, keep the moment of torsion of diesel engine constant; Change the rotating speed of diesel engine, different pressure reference pipe resistance coefficients and ratio K (K=filter pressure/reference pressure) test data sees the following form:
| Rotating speed (rev/min) | The K value of reference resistance coefficient=0.5 o'clock | The K value of reference resistance coefficient=0.8 o'clock | The K value of reference resistance coefficient=1.0 o'clock | The K value of reference resistance coefficient=1.2 o'clock | The K value of reference resistance coefficient=1.5 o'clock |
| 1000 | 1.78 | 1.12 | 0.98 | 0.82 | 0.65 |
| 1500 | 1.95 | 1.24 | 0.99 | 0.84 | 0.68 |
| 2000 | 2.01 | 1.38 | 1.01 | 0.87 | 0.69 |
| 3000 | 2.25 | 1.40 | 1.02 | 0.89 | 0.74 |
| Reference value | 2.00 | 1.25 | 1.00 | 0.834 | 0.667 |
| Maximum error | 12.5% | 11.2% | 2.0% | 6.8% | 11.1% |
This shows when resistance coefficient when the resistance coefficient of pressure reference pipe and exhaust gas filter reach regenerating point is close;, exhaust gas filter changes the power of diesel engine when reaching regenerating point; The filter pressure of measuring and the ratio K of reference pressure are almost constant, explain that diesel engine condition is changed the error of bringing can fully offset.21,31, detected pressures and judge the pressure detecting instrument 5 of regenerating point; Described exhaust gas filter 2 is connected with suction tude 1 through mortor operated valve 21; Described pressure transducer 4 is contained on the suction tude 1; It is characterized in that: described measuring device also comprises the pressure reference pipe 3 with certain resistance coefficient, and pressure reference pipe 3 is connected with suction tude 1 through mortor operated valve 31.
The resistance coefficient of described exhaust gas filter main with exhaust gas filter in the particle accumulation of ceramic for filtration 22 relevant, particle accumulates that many more resistance coefficients are big more, vice versa, its resistance coefficient is a variable; The internal diameter and the length of the main reducer pipe 32 with pressure reference pipe of the resistance coefficient of described pressure reference pipe are relevant, and in length one regularly, its internal diameter slight drag coefficient more is big more, and vice versa, and its resistance coefficient is a constant after its internal diameter is definite; When exhaust gas filter reaches regenerating point and the flow of diesel engine vent gas and temperature at this moment between section remain unchanged; Tail gas stream is crossed the pressure of filter generation and the ratio of the pressure that tail gas stream excess pressure reference pipe produces should be a constant, and this constant can be used as the setting value K ' that judges regenerating point.
The value of the resistance coefficient of pressure reference pipe is respectively 0.5,0.8,1.0,1.2,1.5 of the resistance coefficient of exhaust gas filter when reaching regenerating point; On test-bed, keep the moment of torsion of diesel engine constant; Change the rotating speed of diesel engine, different pressure reference pipe resistance coefficients and ratio K (K=filter pressure/reference pressure) test data sees the following form:
| Rotating speed (rev/min) | The K value of reference resistance coefficient=0.5 o'clock | The K value of reference resistance coefficient=0.8 o'clock | The K value of reference resistance coefficient=1.0 o'clock | The K value of reference resistance coefficient=1.2 o'clock | The K value of reference resistance coefficient=1.5 o'clock |
| 1000 | 1.78 | 1.12 | 0.98 | 0.82 | 0.65 |
| 1500 | 1.95 | 1.24 | 0.99 | 0.84 | 0.68 |
| 2000 | 2.01 | 1.38 | 1.01 | 0.87 | 0.69 |
| 3000 | 2.25 | 1.40 | 1.02 | 0.89 | 0.74 |
| Reference value | 2.00 | 1.25 | 1.00 | 0.834 | 0.667 |
| Maximum error | 12.5% | 11.2% | 2.0% | 6.8% | 11.1% |
This shows when resistance coefficient when the resistance coefficient of pressure reference pipe and exhaust gas filter reach regenerating point is close;, exhaust gas filter changes the power of diesel engine when reaching regenerating point; The filter pressure of measuring and the ratio K of reference pressure are almost constant, explain that diesel engine condition is changed the error of bringing can fully offset.The resistance coefficient of pressure reference pipe is 100%-110% of the resistance coefficient of exhaust gas filter when reaching regenerating point in the present embodiment.
Method of measurement is:
Force samples: promptly measure the filter pressure on the exhaust gas filter earlier; Reference pressure on the measuring pressure reference pipe then; And then the filter pressure on the one-shot measurement exhaust gas filter, the filter pressure of twice measurement is compared, the force value of measuring if both equate is effective; Change the ratio calculation step, repeat the force samples step if both do not wait;
Ratio calculation: promptly calculate the ratio K of effective filter pressure value and effective reference pressure value,
K=filter pressure/reference pressure;
Regenerating point is judged: be about to a ratio K and a setting value K ' relatively, reach regenerating point if K ≧ K ' shows exhaust gas filter; If K ﹤ K ' then begin to continue repetition said method process from the force samples step at a distance from one period stand-by period.
Contrast the step that flow chart Fig. 3 explains that pressure measurement and regenerating point are judged at present:
A, open mortor operated valve 21, close mortor operated valve 31, make tail gas only through exhaust gas filter, the pressure of measurement is filter pressure;
B, open mortor operated valve 31, close mortor operated valve 21, only through pressure reference pipe, the pressure of measurement is reference pressure to tail gas;
C, measure filter pressure once more;
Whether d, comparison a step equate with the measured filter pressure of c step, if a step, the measured filter pressure of c step does not wait then continue repetition a, b, c step; If a step, the measured filter pressure of c step equate to forward to the e step; A step, the measured filter pressure of c step equate that explanation flow and temperature of diesel engine vent gas in the time period of a, b, c step do not change,
E, measured filter pressure and reference pressure calculated by formula " K=filter pressure/reference pressure " after, ratio K and setting value K ' are compared, if K ﹤ K ' then carry out the f step promptly at a distance from one section stand-by period continuation repetition a, b, c, d, e step; If K ≧ K ' reference pressure then explain that exhaust gas filter reaches regenerating point sends regenerated signal, regenerating point is measured deterministic process and is finished.
Should there be a suitable scope the described stand-by period of f step; Reason be when the particle accumulation in the exhaust gas filter less than and during near regenerating point; Grain amount in described stand-by period inner exhaust gas filter is also continuing increase; If waits for too long can make the grain amount in the exhaust gas filter too much exceed the deviation range (described deviation range is generally regenerating point ± 10%) that regenerating point allows; Resistance coefficient was high by 10% when the resistance coefficient of pressure reference pipe was adjusted into the ratio exhaust gas filter and reaches regenerating point during actual motion, and the stand-by period gets and was unlikely to make the particle accumulation of pottery in the exhaust gas filter too much and overproof in 3-5 minute.
Need to prove: tail gas is directly to enter atmosphere through pressure reference pipe in the b step, and the described stand-by period of f step was 3-5 minute less than 2 seconds but required time of b step is very short, so the b step can be ignored the pollution of atmosphere.
Be number of times that reduces the generation of b step and the error in judgement that reduces regenerating point; The method of f step artificial regulation stand-by period changed into by the particle accumulation in the ceramic for filtration produce the stand-by period, thinking is: the momentary value to filter pressure carries out integral operation, and is promptly every at a distance from filter pressure of Δ t time measurement; Δ t is 50 milliseconds-500 milliseconds; Filter pressure value to measured adds up, accumulation result and a setting value t relatively, when both are equal to accumulation result clear 0.At the filtration initial stage, the particle accumulation of ceramic for filtration is few like this, and filter pressure is little, and advancing the speed of filter pressure accumulated value is little, and the time that reaches setting value t is just long, and the described stand-by period is correspondingly also long, and the number of times of b step generation accordingly reduces; Filtering the later stage, the particle accumulation of ceramic for filtration is many, and filter pressure is big, and advancing the speed of filter pressure accumulated value is big, and the time that reaches setting value t is just short, and the described stand-by period is correspondingly also short, reduces the error in judgement of regenerating point.F step after the improvement is used label f ' expression.
Contrast flow chart Fig. 4 at present f ' step be described:
A1 ', open mortor operated valve 21, close mortor operated valve 31, make tail gas only pass through exhaust gas filter;
A2 ', timing Δ t time;
A3 ', measurement filter pressure;
A4 ', the filter pressure value of measuring add up;
A5 ' is if the filter pressure Zhi of adding up ≧ setting value t changes a6 ' step, if filter pressure accumulated value ﹤ setting value t changes a2 ' step;
A6 ', make that accumulated value is 0;
Timing Δ t is 100 milliseconds in a2 ' step
The method that said setting value t confirms is: confirm corresponding diesel oil amount according to the volume of ceramic for filtration, when this oil mass is burnouted by diesel engine, can in ceramic for filtration, produce the grain amount when reaching regenerating point; Begin from clean ceramic filter; Finish when arriving regenerating point; In this process, press Δ t time interval measurement filter pressure (length of described Δ t time should equate with timing Δ t in the a2 ' step); Filter pressure value to measured adds up, and in 1/5 to 1/4 range section of filter pressure accumulated value, selects setting value t.
Diesel engine is under the operating mode of rated speed, rated power; The stand-by period of f step regulation got 4 minutes, adopted the f ' step after improving, and the stand-by period of filtering the initial stage is about 12 minutes; The stand-by period of filtering the later stage is about 2 minutes, and b step frequency is 4-5 times.
The above-mentioned pressure measurement and the judgement of regenerating point are accomplished by pressure detecting instrument 5 automatically.Fig. 2 is the block diagram of pressure detecting instrument 5; Pressure detecting instrument 5 mainly comprises: with the current signal of pressure transducer convert " the current/voltage-converted unit " of voltage signal to, " the D/A switch unit ", controlled filter pressure signal and the reference pressure signal that convert voltage signal to digital signal alternately detects and to pressure signal computing " single-chip microcomputer " relatively, the control signal of single-chip microcomputer output is carried out " power amplification unit " that power amplification drives mortor operated valve; In pressure detecting instrument 5; The output terminal 50 of pressure transducer connects the input end 51 of current/voltage-converted unit; Its output terminal 52 connects the input end 53 of D/A switch unit, and the output terminal 54 of D/A switch unit connects the input end 55 of single-chip microcomputer, and the output terminal 56,57 of single-chip microcomputer connects the input end 56 ', 57 ' of power amplification unit respectively; The output terminal 58,59 of power amplification unit connects mortor operated valve 21,31 respectively, and described single-chip microcomputer also comprises the output terminal 60 of output regeneration cue.The program of carrying out described a step to e step is housed in the described single-chip microcomputer, and regenerating point is after judgement draws, and single-chip microcomputer is exported a signal prompt ceramic for filtration is regenerated.Described single-chip microcomputer can adopt any single-chip microcomputer in the ATMEL89 series, and the output signal of pressure transducer can be current signal, voltage signal or digital signal; If the output signal of pressure transducer 4 is the input end 53 that its output terminal 50 of voltage signal type can directly connect the D/A switch unit; If the output signal of pressure transducer 4 is the input end 55 that its output terminal 50 of digital signal type can directly connect single-chip microcomputer.
Claims (5)
1. the measuring device of a diesel engine vent gas filter regeneration point; Comprise suction tude (1), exhaust gas filter (2), pressure transducer (4), mortor operated valve (21,31), detected pressures and judge the pressure detecting instrument (5) of regenerating point; The output terminal of the input termination pressure transducer (4) of pressure detecting instrument (5), two output terminals of pressure detecting instrument (5) connect mortor operated valve (21,31) respectively; Described exhaust gas filter (2) is connected with suction tude (1) through mortor operated valve (21); Described pressure transducer (4) is contained on the suction tude (1); It is characterized in that: described measuring device also comprises the pressure reference pipe (3) with certain resistance coefficient, and pressure reference pipe (3) is connected with suction tude (1) through mortor operated valve (31).
2. measuring device according to claim 1 is characterized in that: the resistance coefficient of described pressure reference pipe be the resistance coefficient of described exhaust gas filter when reaching regenerating point 100% to 110% in one.
3. measuring device according to claim 1 and 2; It is characterized in that: described pressure detecting instrument (5) mainly comprises: single-chip microcomputer; Power amplification unit; Wherein the input end 55 of single-chip microcomputer connects the output terminal (50) of described pressure transducer (4); The output terminal of single-chip microcomputer (56,57) connects the input end (56 ', 57 ') of power amplification unit respectively, and the output terminal of power amplification unit (58,59) connects mortor operated valve (21,31) respectively, and described single-chip microcomputer also comprises the output terminal (60) of an output regeneration cue.
4. measuring device according to claim 3; It is characterized in that: also have a D/A switch unit between the output terminal (50) of input end of described single-chip microcomputer (55) and described pressure transducer (4); The input end (53) of described D/A switch unit connects the output terminal (50) of described pressure transducer (4), and the output terminal of D/A switch unit (54) connects the input end (55) of single-chip microcomputer.
5. measuring device according to claim 4; It is characterized in that: also have the input end (51) of a current/voltage-converted unit, described current/voltage-converted unit to connect the output terminal (50) of described pressure transducer (4) between the input end (53) of described D/A switch unit and the output terminal (50) of described pressure transducer (4), current/voltage-converted unit output terminal (52) connects the input end (53) of D/A switch unit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104033223A (en) * | 2014-06-30 | 2014-09-10 | 高玉琴 | Internal combustion engine exhaust filter regeneration point measuring device |
| CN104074582A (en) * | 2014-06-30 | 2014-10-01 | 高玉琴 | Measuring method of regeneration point of internal combustion engine tail gas filter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104033223A (en) * | 2014-06-30 | 2014-09-10 | 高玉琴 | Internal combustion engine exhaust filter regeneration point measuring device |
| CN104074582A (en) * | 2014-06-30 | 2014-10-01 | 高玉琴 | Measuring method of regeneration point of internal combustion engine tail gas filter |
| CN104074582B (en) * | 2014-06-30 | 2016-03-30 | 高玉琴 | A kind of method of measurement of tail gas filter of I. C. engine regeneration point |
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| CN102840020B (en) | 2014-11-12 |
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