CN112213112A - Finished automobile GPF carbon loading model correction method based on low-temperature environment cabin - Google Patents
Finished automobile GPF carbon loading model correction method based on low-temperature environment cabin Download PDFInfo
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- CN112213112A CN112213112A CN202010919451.0A CN202010919451A CN112213112A CN 112213112 A CN112213112 A CN 112213112A CN 202010919451 A CN202010919451 A CN 202010919451A CN 112213112 A CN112213112 A CN 112213112A
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000011068 loading method Methods 0.000 title claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 25
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 25
- 238000012937 correction Methods 0.000 title claims description 9
- 238000012360 testing method Methods 0.000 claims abstract description 48
- 238000005303 weighing Methods 0.000 claims abstract description 23
- 238000002791 soaking Methods 0.000 claims abstract description 10
- 230000007613 environmental effect Effects 0.000 claims abstract description 8
- 238000009434 installation Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000008929 regeneration Effects 0.000 claims description 15
- 238000011069 regeneration method Methods 0.000 claims description 15
- 238000007598 dipping method Methods 0.000 claims description 6
- 239000000446 fuel Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000004071 soot Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/10—Testing internal-combustion engines by monitoring exhaust gases or combustion flame
- G01M15/102—Testing internal-combustion engines by monitoring exhaust gases or combustion flame by monitoring exhaust gases
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Testing Of Engines (AREA)
Abstract
The invention belongs to the technical field of automobiles, and particularly relates to a method for correcting a GPF carbon loading model of a whole automobile based on a low-temperature environment cabin. The method comprises the following steps: step one, vehicle installation; step two, obtaining regenerated GPF; step three, obtaining the quality of the regenerated GPF; step four, soaking the car for 6-36 hours according to the temperature required by the test; step five, loading the GPF; and step six, obtaining the quality of the loaded GPF. The method is based on a low-temperature environment cabin, a whole vehicle GPF loading model is corrected, carbon loading tests under different working conditions are carried out by controlling environmental conditions, hub load, vehicle initial conditions and the like, then the GPF is baked through a muffle furnace to remove volatile matters, and loading quality is obtained under the control of weighing conditions; the method can efficiently correct the influence parameters of all factors in the model and can verify the accuracy of the whole model.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a method for correcting a GPF carbon loading model of a whole automobile based on a low-temperature environment cabin.
Background
Under the current situation of increasingly stringent emission standards, gasoline engine particulate filter (GPF) is used as an engine-out purification device of Gasoline Direct Injection (GDI) engine. The carbon loading of the GPF cannot be monitored through the front-back pressure difference, and a reasonable loading model must be designed to estimate the carbon loading, so that the accuracy of the loading model is very important.
GPF is a wall-flow structure, and the purpose of removing soot is realized by trapping soot particles in exhaust on a wall surface, but the continuous accumulation of soot particles can cause GPF blockage, so that the problems of exhaust back pressure rise, engine fuel economy deterioration and the like are caused. In order to recover the filtering function of the GPF, the GPF filled with soot particles needs to be periodically regenerated, and the carbon loading in the GPF is accurately judged as a precondition for periodically regenerating the GPF. The carbon load in the GPF cannot be directly measured or is monitored through the front-back pressure difference, and the calculation and the estimation can be carried out only through the model, so that the accuracy of the model is very important for the estimation of the carbon load.
The purpose that the carbon loading capacity calculated by the model is close to the actual carbon loading capacity is to correct the model, the purpose of quickly correcting the model can be achieved by controlling the loading condition through the low-temperature environment cabin, meanwhile, the environment condition which can be simulated by the low-temperature environment cabin is wide, and therefore the corrected model can be suitable for most of actual running working conditions of vehicles. The GPF can also be loaded by directly driving on an actual road, but the loading condition is uncontrollable, and more variables are not beneficial to model correction.
Part of model correction work can be carried out on an engine assembly rack, but in the case of a whole vehicle, the working state of the engine is more complex, so that the model still needs to be corrected on the whole vehicle finally.
Disclosure of Invention
The invention provides a correction method of a GPF carbon loading model of a whole vehicle based on a low-temperature environment cabin, which can efficiently correct influence parameters of various factors in the model and verify the accuracy of the whole model.
The technical scheme of the invention is described as follows by combining the attached drawings:
a whole vehicle GPF carbon loading model correction method based on a low-temperature environment cabin comprises the following steps:
step one, vehicle installation;
step two, obtaining regenerated GPF;
step three, obtaining the quality of the regenerated GPF;
step four, soaking the car for 6-36 hours according to the temperature required by the test;
step five, loading the GPF;
and step six, obtaining the quality of the loaded GPF.
The specific method of the first step is as follows:
the test vehicle is fixed on a chassis dynamometer, and the outlet of a vehicle exhaust pipe is connected with an automobile exhaust device to set the running resistance of the vehicle.
The specific method of the second step is as follows:
the method comprises the steps of driving a vehicle on a chassis dynamometer at a regeneration required rotating speed of 3800 r/min-4000 r/min, changing an ignition advance angle and an air-fuel ratio through a calibration device to enable the engine to enter a regeneration working condition so as to increase the exhaust temperature and the oxygen content of the engine, judging a regeneration ending moment according to a regeneration amount calculated by a calibration model, and finishing GPF regeneration by adopting other driving working conditions according to the requirements of a calibration engineer.
The concrete method of the third step is as follows:
31) disassembling the GPF;
the vehicle is not started before the GPF is disassembled; when the temperature of the GPF is reduced to be lower than 200 ℃, disassembling;
32) GPF weighing;
before weighing the GPF, the GPF was placed in a muffle furnace for drying; after GPF is put into a muffle furnace, setting the temperature of the muffle furnace to 350 ℃, starting heating, stabilizing the temperature of the muffle furnace for 3 hours after the temperature of the muffle furnace reaches 350 ℃, and then closing the muffle furnace; and taking the GPF out of the muffle furnace, waiting for the temperature to fall, installing a thermocouple temperature sensor T3 at a position which is one third away from the rear end of the central axis of the GPF carrier, monitoring the temperature of T3 through a thermodetector, weighing the GPF on a balance once when the temperature reaches 250 ℃, taking the weighing result as a reference, weighing the GPF once again when the temperature reaches 150 ℃, and taking the weighing result as the measuring result.
The concrete method of the fourth step is as follows:
41) GPF installation;
the weighed GPF is assembled on the vehicle again; fixing the vehicle on the chassis dynamometer again, connecting an outlet of the exhaust pipe with a tail gas removing device, setting the running resistance of the vehicle, and setting the temperature of the environmental chamber according to the environmental conditions of the loading working condition;
42) soaking and turning;
the temperature of the dipping vehicle is the same as the test temperature, the dipping vehicle is fully dipped for 6-36 hours, and the difference between the water temperature of the engine and the ambient temperature is not more than +/-3 ℃; and opening the cabin cover and the vehicle door in the vehicle immersion process.
The concrete method of the step five is as follows:
GPF with the ambient temperature of-30 ℃, 20 ℃ and 10 ℃ is loaded with 4 test conditions: the method comprises the following steps of (1) testing working conditions, 1 testing working condition, 2 testing working condition, 3 testing working condition and 4 testing working condition;
GPF loading test working condition 5 with the environment temperature of 0 ℃, 10 ℃, 20 ℃ and 30 ℃;
Cold starting, idling until the water temperature of the engine is 20 ℃, and flameout;
Firstly, cold starting, idling for 40s, flameout, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
repeatedly executing the first step for 3 times in total;
cold starting, idling for 40s, and flameout;
Firstly, cold starting, idling for 30s, driving at a constant speed of 70km/h for 3min, stopping, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
secondly, repeatedly executing the first step for 2 times in total;
cold starting, idling for 30s, driving at a constant speed of 70km/h for 3min, and flameout;
test Condition 4
Firstly, cold starting, idling for 30s, driving at a constant speed of 100km/h for 3min, stopping, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
secondly, repeatedly executing the first step for 2 times in total;
cold starting, idling for 30s, driving at a constant speed of 100km/h for 3min, and flameout;
test Condition 5
Firstly, cold starting, idling until the water temperature of an engine is 40 ℃, flameout, and soaking the vehicle until the difference between the water temperature of the engine and the ambient temperature is not more than +/-3 ℃;
secondly, repeatedly executing the first step for 9 times in total;
cold starting, idling to 40 deg.C, and stopping
After the GPF is loaded under the working condition, disassembling and weighing again to obtain the loaded weight, wherein the difference value of the two measurement results is the actual load capacity corresponding to the working condition, and the model is corrected by using the load capacity until the calculated value of the model is greater than the actual load capacity but not more than 5% of the actual load capacity;
and the free working condition can be selected to correct the model or verify the accuracy of the whole model.
The invention has the beneficial effects that:
the method is based on a low-temperature environment cabin, a whole vehicle GPF loading model is corrected, carbon loading tests under different working conditions are carried out by controlling environmental conditions, hub load, vehicle initial conditions and the like, then the GPF is baked through a muffle furnace to remove volatile matters, and loading quality is obtained under the control of weighing conditions; the method can efficiently correct the influence parameters of all factors in the model and can verify the accuracy of the whole model.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a flow chart of the present invention;
fig. 2 and 3 are sensor mounting position reference views.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Referring to fig. 1, a method for correcting a GPF carbon loading model of a whole vehicle based on a low-temperature environment cabin includes the following steps:
step one, vehicle installation;
the test vehicle is fixed on a chassis dynamometer, and the outlet of a vehicle exhaust pipe is connected with an automobile exhaust device to set the running resistance of the vehicle.
Step two, obtaining regenerated GPF;
the method comprises the steps of driving a vehicle on a chassis dynamometer at a regeneration required rotating speed of 3800 r/min-4000 r/min, changing parameters such as an ignition advance angle and an air-fuel ratio through a calibration device to enable the engine to enter a regeneration working condition so as to increase the exhaust temperature and the oxygen content of the engine, judging a regeneration ending moment according to a regeneration amount calculated by a calibration model, and finishing GPF regeneration by adopting other driving working conditions according to the requirements of a calibration engineer.
Step three, obtaining the quality of the regenerated GPF;
the concrete method of the third step is as follows:
31) disassembling the GPF;
before the GPF is disassembled, the vehicle is not started so as to avoid loading carbon deposition in the GPF; when the temperature of the GPF is reduced to be lower than 200 ℃, the GPF can be disassembled with the heat insulation gloves, so that the GPF is prevented from being scalded; the disassembling and carrying process should be carefully operated, the GPF is kept to be placed in a horizontal state and is not inclined, and carbon deposition in the GPF is prevented from being scattered outwards.
32) GPF weighing;
before weighing the GPF, the GPF was placed in a muffle furnace for drying; after GPF is put into a muffle furnace, setting the temperature of the muffle furnace to 350 ℃, starting heating, stabilizing the temperature of the muffle furnace for 3 hours after the temperature of the muffle furnace reaches 350 ℃, and then closing the muffle furnace; and taking the GPF out of the muffle furnace, waiting for the temperature to fall, installing a thermocouple temperature sensor T3 at a position which is one third away from the rear end of the central axis of the GPF carrier, monitoring the temperature of T3 through a thermodetector, weighing the GPF on a balance once when the temperature reaches 250 ℃, taking the weighing result as a reference, weighing the GPF once again when the temperature reaches 150 ℃, and taking the weighing result as the measuring result.
Step four, soaking the car for 6-36 hours according to the temperature required by the test;
41) GPF installation;
the weighed GPF is assembled on the vehicle again and the sensors are ensured not to be damaged; fixing the vehicle on the chassis dynamometer again, connecting an outlet of the exhaust pipe with a tail gas removing device, setting the running resistance of the vehicle, and setting the temperature of the environmental chamber according to the environmental conditions of the loading working condition;
42) soaking and turning;
the temperature of the dipping vehicle is the same as the test temperature, the dipping vehicle is fully dipped for 6-36 hours, and the difference between the water temperature of the engine and the ambient temperature is not more than +/-3 ℃; and opening the cabin cover and the vehicle door in the vehicle immersion process.
Step five, loading the GPF;
the concrete method of the step five is as follows:
GPF with the ambient temperature of-30 ℃, 20 ℃ and 10 ℃ is loaded with 4 test conditions: the method comprises the following steps of (1) testing working conditions, 1 testing working condition, 2 testing working condition, 3 testing working condition and 4 testing working condition;
GPF loading test working condition 5 with the environment temperature of 0 ℃, 10 ℃, 20 ℃ and 30 ℃;
Cold starting, idling until the water temperature of the engine is 20 ℃, and flameout;
Firstly, cold starting, idling for 40s, flameout, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
repeatedly executing the first step for 3 times in total;
cold starting, idling for 40s, and flameout;
Firstly, cold starting, idling for 30s, driving at a constant speed of 70km/h for 3min, stopping, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
secondly, repeatedly executing the first step for 2 times in total;
cold starting, idling for 30s, driving at a constant speed of 70km/h for 3min, and flameout;
test Condition 4
Firstly, cold starting, idling for 30s, driving at a constant speed of 100km/h for 3min, stopping, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
secondly, repeatedly executing the first step for 2 times in total;
cold starting, idling for 30s, driving at a constant speed of 100km/h for 3min, and flameout;
test Condition 5
Firstly, cold starting, idling until the water temperature of an engine is 40 ℃, flameout, and soaking the vehicle until the difference between the water temperature of the engine and the ambient temperature is not more than +/-3 ℃;
fourthly, repeatedly executing the first step for 9 times in total;
and thirdly, cold starting, idling until the water temperature of the engine is 40 ℃, and flameout.
And step six, obtaining the quality of the loaded GPF.
After the GPF is loaded under the working condition, disassembling and weighing again to obtain the loaded weight, wherein the difference value of the two measurement results is the actual load capacity corresponding to the working condition, and the model is corrected by using the load capacity until the calculated value of the model is greater than the actual load capacity but not more than 5% of the actual load capacity;
and the free working condition can be selected to correct the model or verify the accuracy of the whole model.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A whole vehicle GPF carbon loading model correction method based on a low-temperature environment cabin is characterized by comprising the following steps:
step one, vehicle installation;
step two, obtaining regenerated GPF;
step three, obtaining the quality of the regenerated GPF;
step four, soaking the car for 6-36 hours according to the temperature required by the test;
step five, loading the GPF;
and step six, obtaining the quality of the loaded GPF.
2. The method for correcting the GPF carbon loading model of the whole vehicle based on the low-temperature environment cabin is characterized in that the method in the first step is as follows:
the test vehicle is fixed on a chassis dynamometer, and the outlet of a vehicle exhaust pipe is connected with an automobile exhaust device to set the running resistance of the vehicle.
3. The method for correcting the GPF carbon loading model of the whole vehicle based on the low-temperature environment cabin is characterized in that the method in the second step is as follows:
the method comprises the steps of driving a vehicle on a chassis dynamometer at a regeneration required rotating speed of 3800 r/min-4000 r/min, changing an ignition advance angle and an air-fuel ratio through a calibration device to enable the engine to enter a regeneration working condition so as to increase the exhaust temperature and the oxygen content of the engine, judging a regeneration ending moment according to a regeneration amount calculated by a calibration model, and finishing GPF regeneration by adopting other driving working conditions according to the requirements of a calibration engineer.
4. The finished automobile GPF carbon loading model correction method based on the low-temperature environment cabin is characterized in that the concrete method in the third step is as follows:
31) disassembling the GPF;
the vehicle is not started before the GPF is disassembled; when the temperature of the GPF is reduced to be lower than 200 ℃, disassembling;
32) GPF weighing;
before weighing the GPF, the GPF was placed in a muffle furnace for drying; after GPF is put into a muffle furnace, setting the temperature of the muffle furnace to 350 ℃, starting heating, stabilizing the temperature of the muffle furnace for 3 hours after the temperature of the muffle furnace reaches 350 ℃, and then closing the muffle furnace; and taking the GPF out of the muffle furnace, waiting for the temperature to fall, installing a thermocouple temperature sensor T3 at a position which is one third away from the rear end of the central axis of the GPF carrier, monitoring the temperature of T3 through a thermodetector, weighing the GPF on a balance once when the temperature reaches 250 ℃, taking the weighing result as a reference, weighing the GPF once again when the temperature reaches 150 ℃, and taking the weighing result as the measuring result.
5. The method for correcting the GPF carbon loading model of the whole vehicle based on the low-temperature environment cabin is characterized in that the fourth step is as follows:
41) GPF installation;
the weighed GPF is assembled on the vehicle again; fixing the vehicle on the chassis dynamometer again, connecting an outlet of the exhaust pipe with a tail gas removing device, setting the running resistance of the vehicle, and setting the temperature of the environmental chamber according to the environmental conditions of the loading working condition;
42) soaking and turning;
the temperature of the dipping vehicle is the same as the test temperature, the dipping vehicle is fully dipped for 6-36 hours, and the difference between the water temperature of the engine and the ambient temperature is not more than +/-3 ℃; and opening the cabin cover and the vehicle door in the vehicle immersion process.
6. The finished automobile GPF carbon loading model correction method based on the low-temperature environment cabin is characterized in that the concrete method in the fifth step is as follows:
GPF with the ambient temperature of-30 ℃, 20 ℃ and 10 ℃ is loaded with 4 test conditions: the method comprises the following steps of (1) testing working conditions, 1 testing working condition, 2 testing working condition, 3 testing working condition and 4 testing working condition;
GPF loading test working condition 5 with the environment temperature of 0 ℃, 10 ℃, 20 ℃ and 30 ℃;
test Condition 1
Cold starting, idling until the water temperature of the engine is 20 ℃, and flameout;
test Condition 2
Firstly, cold starting, idling for 40s, flameout, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
repeatedly executing the first step for 3 times in total;
cold starting, idling for 40s, and flameout;
test Condition 3
Firstly, cold starting, idling for 30s, driving at a constant speed of 70km/h for 3min, stopping, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
secondly, repeatedly executing the first step for 2 times in total;
cold starting, idling for 30s, driving at a constant speed of 70km/h for 3min, and flameout;
test Condition 4
Firstly, cold starting, idling for 30s, driving at a constant speed of 100km/h for 3min, stopping, and immersing the vehicle until the difference between the water temperature of an engine and the ambient temperature is not more than +/-3 ℃;
secondly, repeatedly executing the first step for 2 times in total;
cold starting, idling for 30s, driving at a constant speed of 100km/h for 3min, and flameout;
test Condition 5
Firstly, cold starting, idling until the water temperature of an engine is 40 ℃, flameout, and soaking the vehicle until the difference between the water temperature of the engine and the ambient temperature is not more than +/-3 ℃;
secondly, repeatedly executing the first step for 9 times in total;
and thirdly, cold starting, idling until the water temperature of the engine is 40 ℃, and flameout.
7. The method for correcting the GPF carbon loading model of the whole vehicle based on the low-temperature environment cabin is characterized in that the concrete method in the sixth step is as follows:
after the GPF is loaded under the working condition, disassembling and weighing again to obtain the loaded weight, wherein the difference value of the two measurement results is the actual load capacity corresponding to the working condition, and the model is corrected by using the load capacity until the calculated value of the model is greater than the actual load capacity but not more than 5% of the actual load capacity;
and the free working condition can be selected to correct the model or verify the accuracy of the whole model.
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| CN113217146A (en) * | 2021-04-08 | 2021-08-06 | 浙江吉利控股集团有限公司 | Engine GPF module control method and system based on model temperature correction |
| CN114136653A (en) * | 2021-08-23 | 2022-03-04 | 上汽大通房车科技有限公司 | Temperature rise and temperature drop test method in vehicle |
| CN115077929A (en) * | 2022-05-24 | 2022-09-20 | 哈尔滨东安汽车发动机制造有限公司 | Calibration and activation test method for GPF (general purpose function) rack for vehicle |
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