CN114324049A - DPF maximum carbon loading capacity verification method - Google Patents
DPF maximum carbon loading capacity verification method Download PDFInfo
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- CN114324049A CN114324049A CN202111642885.1A CN202111642885A CN114324049A CN 114324049 A CN114324049 A CN 114324049A CN 202111642885 A CN202111642885 A CN 202111642885A CN 114324049 A CN114324049 A CN 114324049A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 52
- 238000012795 verification Methods 0.000 title claims abstract description 21
- 230000008929 regeneration Effects 0.000 claims abstract description 52
- 238000011069 regeneration method Methods 0.000 claims abstract description 52
- 238000009825 accumulation Methods 0.000 claims abstract description 11
- 238000005303 weighing Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 230000002035 prolonged effect Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 2
- 239000002245 particle Substances 0.000 abstract description 13
- 230000001172 regenerating effect Effects 0.000 abstract 2
- 239000012876 carrier material Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a DPF maximum carbon loading capacity verification method, which comprises the following steps: arranging a thermocouple in a DPF of a laboratory engine test bench, regenerating, weighing the mass of the DPF after regeneration as M1, accumulating carbon in the DPF, weighing the mass of the DPF after carbon accumulation as M2, calculating the actual carbon loading amount X2 by using M2-M1, performing a regeneration mode again after X2 meets a standard value, regenerating and operating to the idling reduction moment, controlling the engine to the idling working condition, determining the maximum temperature of the thermocouple, and comparing the maximum temperature with the maximum temperature limit value allowed by the DPF to finally obtain the actual carbon loading amount of the PDF. The method can accurately measure the maximum carbon loading of the particle catcher under the working condition of the actual vehicle, thereby effectively prolonging the service life of the particle catcher.
Description
Technical Field
The invention relates to a DPF maximum carbon loading capacity verification method, and belongs to the technical field of automobiles.
Background
Diesel particulate traps (DPFs) are important components of aftertreatment devices, primarily functioning to trap soot particles in the exhaust stream. When a vehicle runs and the DPF enters regeneration, if an engine stops and the engine enters an idling working condition at the moment, particles in the DPF begin to burn, and after the vehicle stops and the engine enters the idling working condition, the temperature in the DPF rises sharply due to the fact that the exhaust flow is not enough to take away heat generated by particle combustion, meanwhile, the maximum temperature which can be borne by an internal carrier material of the DPF has a limiting requirement, and therefore the capability of trapping the particles of the DPF, namely the carbon loading capacity, is of the limiting requirement.
In the vehicle design process, the maximum theoretical carbon loading capacity of the DPF is calculated through computer simulation and a mathematical model, but at present, a method capable of simulating the maximum carbon loading capacity of the DPF under the actual running working condition of a vehicle does not exist, so that the service life of the DPF in the prior art is influenced to a certain extent, and therefore a method capable of simulating the maximum carbon loading capacity of the DPF under the actual working condition of the vehicle is urgently needed to be developed.
Disclosure of Invention
The invention aims to provide a DPF maximum carbon loading capacity verification method, which can be used for solving the defects in the prior art and accurately measuring the maximum carbon loading capacity of a particle trap under the actual working condition, so that the service life of the particle trap is effectively prolonged.
The invention provides a DPF maximum carbon loading capacity verification method, which comprises the following steps:
the method comprises the following steps: disposing a plurality of thermocouples within a DPF of a laboratory engine test rig;
step two: controlling the engine to a half-rated speed and half-maximum torque working condition, and controlling the engine to enter a regeneration mode for 1 h;
step three: controlling the engine to stop running after regeneration is completed, naturally cooling the DPF to 200 ℃, disassembling the DPF, and weighing the DPF, wherein the weighed mass is M1;
step four: determining the required carbon loading amount X1 according to the vehicle type, controlling the engine to reach the half rated rotating speed and half maximum torque working condition, and implementing DPF carbon accumulation;
step five: stopping the engine after carbon accumulation, naturally cooling the DPF to 200 ℃, disassembling and weighing, and recording the mass M2 at the moment;
step six: calculating the actual carbon load X2 by using M2-M1, and ending carbon accumulation if the actual carbon load X2 is within +/-10% of the deviation of the required carbon load X1; if the actual carbon load X2 is less than the minus 10% deviation of the demanded carbon load X1, continuing to accumulate carbon until the actual carbon load X2 is within + -10% deviation of the demanded carbon load X1;
step seven: controlling the engine to a half-rated speed and half-maximum torque working condition, controlling the engine to enter a regeneration mode, and controlling the engine to an idling working condition when the regeneration operation is carried out to the idling reduction moment;
step eight: starting to record a temperature change curve of the thermocouple from the idling working condition moment of the engine, and determining the maximum temperature in the change process;
step nine: comparing whether the maximum temperature measured in the step eight is in the range that the maximum temperature limit allowed by the DPF is 50 ℃ lower, if so, ending the test, and if so, determining the carbon loading amount X as the actual carbon loading amount of the PDF;
otherwise, increasing the carbon loading X and repeating the fourth step to the ninth step until the maximum temperature measured in the eighth step is in the range that the maximum temperature limit value allowed by the DPF is lower than 50 ℃, wherein the increased carbon loading X is the actual maximum carbon loading of the PDF.
In the DPF maximum carbon loading verification method, preferably, the number of the thermocouples is five, and the thermocouples are respectively a first thermocouple, a second thermocouple, a third thermocouple, a fourth thermocouple and a fifth thermocouple, where the first thermocouple, the second thermocouple and the third thermocouple are arranged on a central axis of the DPF, the first thermocouple is located at a position 30mm away from an air inlet end of the DPF, the second thermocouple is located at a central position of the DPF, the third thermocouple is located at a position 30mm away from an air outlet end of the DPF, the fourth thermocouple and the second thermocouple are arranged on the same radius, a distance between the fourth thermocouple and the second thermocouple is 0.5R, a distance between the fifth thermocouple and the third thermocouple is arranged on the same radius, and a distance between the fifth thermocouple and the third thermocouple is 0.5R.
In the DPF maximum carbon loading verification method described above, preferably, in step two, when the first thermocouple reaches 620 ℃, the engine is controlled to enter a regeneration mode.
In the method for verifying the maximum carbon loading of the DPF, preferably, in step four, the method for calculating the required carbon loading X1 is as follows: the volume of the DPF is multiplied by the lower limit of the PDF safe carbon loading reference.
In the DPF maximum carbon loading verification method described above, preferably, in step six, if the actual carbon loading X2 is greater than the plus 10% deviation of the required carbon loading X1, the process returns to step two.
In the DPF maximum carbon loading verification method described above, preferably, in step seven, when the first thermocouple reaches 620 ℃, the engine is controlled to enter a regeneration mode.
In the DPF maximum carbon loading verification method described above, preferably, in step seven, the determination method of the idle-down time is:
the DPF is regenerated under the condition of the required carbon loading amount X1, assuming that the initial regeneration time is t1, after the regeneration is completed, the engine is reduced to an idling working condition, the temperature change curves of a first thermocouple to a fifth thermocouple in the DPF are recorded, and the maximum temperature Tmax1 in the temperature change process is determined;
the method comprises the steps that carbon of the DPF is accumulated again to the required carbon loading amount X1, the regeneration time is prolonged or shortened to t2, the engine is reduced to an idling working condition after regeneration is completed, temperature change curves of a first thermocouple to a fifth thermocouple in the DPF are recorded, the maximum temperature Tmax2 in the temperature change process is determined, if the Tmax2 is larger than the Tmax1, the regeneration time is continuously prolonged or shortened to t3, the engine is reduced to the idling working condition after regeneration is completed, the temperature change curves of the first thermocouple to the fifth thermocouple in the DPF are recorded, the maximum temperature Tmax3 in the temperature change process is determined, if the Tmax3 is smaller than the Tmax2, the second preset temperature is determined to be between t2 and t3, the regeneration time is shortened or prolonged after carbon is accumulated again, the sizes of the Tmax4 and the Tmax3 are continuously determined, the regeneration time is corrected, and the final regeneration time corresponding to the maximum temperature in the DPF is determined through an idling regular cycle, and the regeneration time is the reduction moment.
In the DPF maximum carbon loading verification method, preferably, in step eight, the thermocouples are a second thermocouple, a third thermocouple, a fourth thermocouple, and a fifth thermocouple.
Compared with the prior art, the invention provides a set of complete method for verifying the maximum carbon loading capacity of the DPF under the actual working condition, and the calibration value of the carbon loading capacity of the DPF can be accurately corrected by using the method, so that the service life of the DPF of a vehicle is ensured, the vehicle cost of a customer is reduced, and the waste of resources is also reduced.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention comprises the following steps: a DPF maximum carbon loading verification method comprises the following steps:
the method comprises the following steps: disposing a plurality of thermocouples within a DPF of a laboratory engine test rig;
the laboratory engine experiment bench comprises a complete engine system, a gearbox system and a tail gas discharge system and is used for simulating the working condition of a real vehicle; in the embodiment, five thermocouples are arranged in the DPF, which are respectively a first thermocouple, a second thermocouple, a third thermocouple, a fourth thermocouple and a fifth thermocouple, wherein the first thermocouple, the second thermocouple and the third thermocouple are arranged on a central axis of the DPF, the first thermocouple is located at a position 30mm away from an air inlet end of the DPF, the second thermocouple is located at a central position of the DPF, the third thermocouple is located at a position 30mm away from an air outlet end of the DPF, the fourth thermocouple and the second thermocouple are arranged on the same radius, the distance between the fourth thermocouple and the second thermocouple is 0.5R, the fifth thermocouple and the third thermocouple are arranged on the same radius, and the distance between the fifth thermocouple and the third thermocouple is 0.5R. The thermocouple is a product in the prior art and can be directly purchased and obtained.
Step two: controlling the engine to a half-rated rotating speed and half-maximum torque working condition, and controlling the engine to enter a regeneration mode when the temperature of the first thermocouple reaches 620 ℃, wherein the regeneration time is 1 h;
step three: controlling the engine to stop running after regeneration is completed, naturally cooling the DPF to 200 ℃, disassembling the DPF, and weighing the DPF, wherein the weighed mass is M1; the carbon loading in the DPF after regeneration is finished is 0, so the mass of M1 is the mass of the DPF;
step four: determining the required carbon loading amount X1 according to the vehicle type, controlling the engine to reach the half rated rotating speed and half maximum torque working condition, and implementing DPF carbon accumulation; the carbon accumulation process of the DPF is a process for catching carbon smoke particles by the DPF, tail gas generated by the work of an engine contains carbon particles, and the carbon particles are caught by the DPF and are left in the DPF;
step five: stopping the engine after carbon accumulation, naturally cooling the DPF to 200 ℃, disassembling the DPF, weighing, and recording the mass M2 at the moment; m2 is the mass of the DPF itself plus the mass of the trapped carbon particles.
Step six: calculating the actual carbon load X2 by using M2-M1, and ending carbon accumulation if the actual carbon load X2 is within +/-10% of the deviation of the required carbon load X1;
if the actual carbon load X2 is less than the minus 10% deviation of the demanded carbon load X1, continuing to accumulate carbon until the actual carbon load X2 is within + -10% deviation of the demanded carbon load X1;
if the actual carbon loading X2 is greater than the plus 10% deviation of the required carbon loading X1, returning to the step two, performing regeneration operation, completely burning off carbon particles in the DPF, and re-measuring M1;
step seven: controlling the engine to a half-rated speed and half-maximum torque working condition, controlling the engine to enter a regeneration mode when the first thermocouple reaches 620 ℃, and controlling the engine to an idle working condition when the regeneration operation reaches the idle reduction moment;
step eight: starting to record temperature change curves of the second thermocouple, the third thermocouple, the fourth thermocouple and the fifth thermocouple from the idling working condition moment of the engine, and determining the maximum temperature in the change process;
step nine: comparing whether the maximum temperature measured in the step eight is in the range that the maximum temperature limit allowed by the DPF is 50 ℃ lower, if so, ending the test, and if so, determining the carbon loading amount X as the actual carbon loading amount of the PDF;
otherwise, increasing the carbon loading X and repeating the fourth step to the ninth step until the maximum temperature measured in the eighth step is in the range that the maximum temperature limit value allowed by the DPF is lower than 50 ℃, wherein the increased carbon loading X is the actual maximum carbon loading of the PDF.
In this embodiment, the calculation method of the required carbon capacity X1 is as follows: the volume of the DPF is multiplied by the lower limit of the PDF safe carbon loading reference.
For example: the volume of the DPF carrier is 4L, the reference index of the DPF safety carbon loading is 5g/L-8g/L, and the required carbon loading X1 is 4X 5-20 g.
Further, in the present embodiment, the method for determining the idle reduction time includes:
the DPF is regenerated under the condition of the required carbon loading amount X1, assuming that the initial regeneration time is t1, after the regeneration is completed, the engine is reduced to an idling working condition, the temperature change curves of a first thermocouple to a fifth thermocouple in the DPF are recorded, and the maximum temperature Tmax1 in the temperature change process is determined;
the method comprises the steps that carbon of the DPF is accumulated again to the required carbon loading amount X1, the regeneration time is prolonged or shortened to t2, the engine is reduced to an idling working condition after regeneration is completed, temperature change curves of a first thermocouple to a fifth thermocouple in the DPF are recorded, the maximum temperature Tmax2 in the temperature change process is determined, if the Tmax2 is larger than the Tmax1, the regeneration time is continuously prolonged or shortened to t3, the engine is reduced to the idling working condition after regeneration is completed, the temperature change curves of the first thermocouple to the fifth thermocouple in the DPF are recorded, the maximum temperature Tmax3 in the temperature change process is determined, and if the Tmax3 is larger than the Tmax1
If the temperature is less than Tmax2, the second preset temperature is confirmed to be between t2 and t3, the regeneration time is shortened or prolonged after carbon is accumulated again, the sizes of Tmax4 and Tmax3 are continuously confirmed, the regeneration time is corrected, the final regeneration time corresponding to the maximum temperature in the DPF is determined in a regular cycle mode, and the regeneration time is the idling reduction time.
The method can accurately calculate the maximum carbon loading capacity of the DPF under the maximum temperature value, effectively prevent the DPF from being damaged due to high temperature and effectively prolong the service life of the DPF.
The above embodiments are intended to illustrate the structure, features and operation of the invention, and it is intended that the invention be limited only to the preferred embodiments and equivalents thereof as may be modified and equivalents thereof without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A DPF maximum carbon loading verification method is characterized by comprising the following steps:
the method comprises the following steps: disposing a plurality of thermocouples within a DPF of a laboratory engine test rig;
step two: controlling the engine to a half-rated speed and half-maximum torque working condition, and controlling the engine to enter a regeneration mode for 1 h;
step three: controlling the engine to stop running after regeneration is completed, naturally cooling the DPF to 200 ℃, disassembling the DPF, and weighing the DPF, wherein the weighed mass is M1;
step four: determining the required carbon loading amount X1 according to the vehicle type, controlling the engine to reach the half rated rotating speed and half maximum torque working condition, and implementing DPF carbon accumulation;
step five: stopping the engine after carbon accumulation, naturally cooling the DPF to 200 ℃, disassembling and weighing, and recording the mass M2 at the moment;
step six: calculating the actual carbon load X2 by using M2-M1, and ending carbon accumulation if the actual carbon load X2 is within +/-10% of the deviation of the required carbon load X1; if the actual carbon load X2 is less than the minus 10% deviation of the demanded carbon load X1, continuing to accumulate carbon until the actual carbon load X2 is within + -10% deviation of the demanded carbon load X1;
step seven: controlling the engine to a half-rated speed and half-maximum torque working condition, controlling the engine to enter a regeneration mode, and controlling the engine to an idling working condition when the regeneration operation is carried out to the idling reduction moment;
step eight: starting to record a temperature change curve of the thermocouple from the idling working condition moment of the engine, and determining the maximum temperature in the change process;
step nine: comparing whether the maximum temperature measured in the step eight is in the range that the maximum temperature limit allowed by the DPF is 50 ℃ lower, if so, ending the test, and if so, determining the carbon loading amount X as the actual carbon loading amount of the PDF;
otherwise, increasing the carbon loading X and repeating the fourth step to the ninth step until the maximum temperature measured in the eighth step is in the range that the maximum temperature limit value allowed by the DPF is lower than 50 ℃, wherein the increased carbon loading X is the actual maximum carbon loading of the PDF.
2. The DPF maximum carbon loading verification method of claim 1, wherein: the thermocouple is provided with five thermocouples which are respectively a first thermocouple, a second thermocouple, a third thermocouple, a fourth thermocouple and a fifth thermocouple, wherein the first thermocouple, the second thermocouple and the third thermocouple are arranged on a central axis of the DPF, the first thermocouple is located at a position 30mm away from an air inlet end of the DPF, the second thermocouple is located at the central position of the DPF, the third thermocouple is located at a position 30mm away from an air outlet end of the DPF, the fourth thermocouple and the second thermocouple are arranged on the same radius, the distance between the fourth thermocouple and the second thermocouple is 0.5R, the fifth thermocouple and the third thermocouple are arranged on the same radius, and the distance between the fifth thermocouple and the third thermocouple is 0.5R.
3. The DPF maximum carbon loading verification method of claim 2, wherein: in the second step, when the first thermocouple reaches 620 ℃, controlling the engine to enter a regeneration mode.
4. The DPF maximum carbon loading verification method of claim 2, wherein: in step four, the calculation method of the required carbon loading X1 is as follows: the volume of the DPF is multiplied by the lower limit of the PDF safe carbon loading reference.
5. The DPF maximum carbon loading verification method of claim 2, wherein: in step six, if the actual carbon load X2 is greater than the plus 10% deviation of the desired carbon load X1, then return is made to step two.
6. The DPF maximum carbon loading verification method of claim 2, wherein: and step seven, controlling the engine to enter a regeneration mode when the first thermocouple reaches 620 ℃.
7. The DPF maximum carbon loading verification method of claim 2 or 6, wherein: in step seven, the method for determining the idle-down time comprises the following steps:
the DPF is regenerated under the condition of the required carbon loading amount X1, assuming that the initial regeneration time is t1, after the regeneration is completed, the engine is reduced to an idling working condition, the temperature change curves of a first thermocouple to a fifth thermocouple in the DPF are recorded, and the maximum temperature Tmax1 in the temperature change process is determined;
the method comprises the steps that carbon of the DPF is accumulated again to the required carbon loading amount X1, the regeneration time is prolonged or shortened to t2, the engine is reduced to an idling working condition after regeneration is completed, temperature change curves of a first thermocouple to a fifth thermocouple in the DPF are recorded, the maximum temperature Tmax2 in the temperature change process is determined, if the Tmax2 is larger than the Tmax1, the regeneration time is continuously prolonged or shortened to t3, the engine is reduced to the idling working condition after regeneration is completed, the temperature change curves of the first thermocouple to the fifth thermocouple in the DPF are recorded, the maximum temperature Tmax3 in the temperature change process is determined, if the Tmax3 is smaller than the Tmax2, the second preset temperature is determined to be between t2 and t3, the regeneration time is shortened or prolonged after carbon is accumulated again, the sizes of the Tmax4 and the Tmax3 are continuously determined, the regeneration time is corrected, and the final regeneration time corresponding to the maximum temperature in the DPF is determined through an idling regular cycle, and the regeneration time is the reduction moment.
8. The DPF maximum carbon loading verification method of claim 7, wherein: in the eighth step, the thermocouples are a second thermocouple, a third thermocouple, a fourth thermocouple and a fifth thermocouple.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061051A (en) * | 2014-06-30 | 2014-09-24 | 长城汽车股份有限公司 | Regeneration opportunity control method for DPF (Diesel Particulate Filter) of diesel engine |
| CN107831089A (en) * | 2017-09-27 | 2018-03-23 | 无锡威孚力达催化净化器有限责任公司 | A kind of maximum safe carbon carrying capacity experimental rigs of DPF and its method of testing |
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- 2021-12-29 CN CN202111642885.1A patent/CN114324049A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061051A (en) * | 2014-06-30 | 2014-09-24 | 长城汽车股份有限公司 | Regeneration opportunity control method for DPF (Diesel Particulate Filter) of diesel engine |
| CN107831089A (en) * | 2017-09-27 | 2018-03-23 | 无锡威孚力达催化净化器有限责任公司 | A kind of maximum safe carbon carrying capacity experimental rigs of DPF and its method of testing |
Non-Patent Citations (2)
| Title |
|---|
| 胡帅;孙泽;: "柴油机DPF特性测试评价", 汽车实用技术, no. 22, 30 November 2018 (2018-11-30), pages 106 - 108 * |
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