CN118010364A - Automobile exhaust temperature verification and optimization method - Google Patents
Automobile exhaust temperature verification and optimization method Download PDFInfo
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- CN118010364A CN118010364A CN202410164243.2A CN202410164243A CN118010364A CN 118010364 A CN118010364 A CN 118010364A CN 202410164243 A CN202410164243 A CN 202410164243A CN 118010364 A CN118010364 A CN 118010364A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012795 verification Methods 0.000 title claims abstract description 27
- 238000005457 optimization Methods 0.000 title claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 65
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000012790 confirmation Methods 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
-
- 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
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
- G01M15/048—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring temperature
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Engines (AREA)
Abstract
An automobile exhaust temperature verification and optimization method belongs to the technical field of automobile engines. Through the mode of drum loading and boundary conditions such as control test temperature, humidity, can accomplish the verification test and the optimization to the exhaust temperature under the full operating mode of car fast, it is insufficient to have solved the verification test of car exhaust temperature, is limited by test season, test place and test environment and the difficult stable problem of control of car operating mode. The method comprises the following steps: s3, determining road load and gradient loaded by the rotary drum; s4, controlling test boundary conditions; s5, selecting proper vehicle speed and gear; s6, confirming a combination mode of the working condition points; s7, performing an automobile full-working-condition temperature discharge verification test process on the rotary drum, and adjusting a test gradient according to a gear position and a vehicle speed in the test by combining working-condition points in S3-S5 and S6 so as to perform the automobile full-working-condition temperature discharge verification test; s8, acquiring a temperature discharge result of the automobile under the full working condition, and carefully optimizing the area with high temperature discharge.
Description
Technical Field
The invention belongs to the technical field of automobile engines, and particularly relates to an automobile exhaust temperature verification and optimization method.
Background
PFI (port injection) and GDI (in-cylinder direct injection) engines typically control exhaust temperature by monitoring engine speed, water temperature, intake air temperature, exhaust gas temperature, intake air pressure, and other parameters through an ECU (electronic control unit) during a stage of stage calibration. When the exhaust temperature is too high, the ECU sends out a command to continuously adjust the concentration degree of the mixed gas, so that the exhaust temperature of the automobile is reduced, and the fuel consumption limit value is increased due to the upgrading of regulations, so that the mixed gas cannot be enriched too much; the engine is in the stage of bench calibration, the operation condition is more stable, but the automobile is influenced by environmental temperature, geographical position, altitude, driving habit, road conditions and the like in the actual road running process, and the accuracy of air intake, ignition and oil injection of the engine cannot be guaranteed by the basic model calibrated by the bench at the moment, so that the exhaust temperature verification test and optimization are required to be carried out on the whole automobile again.
At present, each temperature discharge verification test and optimization of the automobile is performed on an actual road only at a hot test site by adding a counterweight to the automobile. The method is time-consuming and labor-consuming, meanwhile, the road condition of an actual road is complex, the running condition of the automobile is difficult to control stably, measurement is inconvenient, the road test cannot cover the temperature discharge condition of the automobile under the full condition, the risk of exceeding the temperature discharge is still remained, in addition, the actual road test has certain potential safety hazard, and meanwhile, the road test is limited by test seasons, test places and test environments; at present, the automobile exhaust temperature verification has obvious problems, and a complete and effective test method is still lacking.
Disclosure of Invention
The invention aims to provide an automobile exhaust temperature verification and optimization method, which can rapidly complete verification test and optimization of the exhaust temperature of an automobile under all working conditions by means of drum loading and control of boundary conditions such as test temperature, humidity and the like, solves the problems that the automobile exhaust temperature verification period is long, the test is insufficient, the automobile exhaust temperature verification is limited by test seasons, test places and test environments and the automobile working conditions are not easy to control stably, and has higher safety and execution effectiveness.
The technical scheme adopted by the invention is as follows:
the automobile exhaust temperature verification and optimization method comprises the following steps:
S1, confirming a test mode;
S2, confirming states of the automobile and the engine;
s3, determining road load and gradient loaded by the rotary drum;
s4, controlling test boundary conditions;
s5, selecting proper vehicle speed and gear;
s6, confirming a combination mode of the working condition points;
S7, performing an automobile full-working-condition temperature discharge verification test process on the rotary drum, and adjusting a test gradient according to a gear position and a vehicle speed in the test by combining working-condition points in S3-S5 and S6 so as to perform the automobile full-working-condition temperature discharge verification test;
S8, acquiring a temperature discharge result of the automobile under the full working condition, and carefully optimizing the area with high temperature discharge.
Compared with the prior art, the invention has the following beneficial effects:
According to practical project working experience, the invention utilizes a national six-drum laboratory to ensure the steady-state running of the automobile, controls the boundary conditions such as test temperature, humidity, windward speed, speed and the like through a way of increasing road load and gradient by the drum, simulates various test environments, rapidly completes verification test and optimization of exhaust temperature of the automobile under all working conditions, fills up the technical blank, solves the problems of long verification period, insufficient test, limitation of test seasons, test places and test environments and difficult stable control of automobile road working conditions in the prior art, and avoids the risk of damage to the three-way catalyst caused by overhigh exhaust temperature. The method is convenient to operate, time-saving and labor-saving, high in execution effectiveness and safety, and meets the design concepts of universality, low cost, reliability and high efficiency, and the working efficiency can be further improved.
Drawings
FIG. 1 is a schematic illustration of an engine enrichment operating point of an automobile;
FIG. 2 is a graph of the results of the exhaust temperature for an automobile under all conditions tested using the method of the present invention;
FIG. 3 is a graph of the results of the optimized exhaust temperature.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings for a better understanding of the objects, structures and functions of the present invention.
The invention relates to a method for verifying and optimizing the exhaust temperature of an automobile, which comprises the following steps:
S1, confirming a test mode: testing by using a national six-drum laboratory;
S2, confirming states of an automobile and an engine: the state of the automobile and the state of the engine are confirmed to be abnormal, the automobile can be started and operated normally, and the exhaust temperature signal can be monitored and recorded normally;
s3, determining road load and gradient loaded by the rotary drum: calculating the road load to be loaded by the rotary drum according to the maximum mass, the reference mass and the vehicle type parameters of the vehicle or using the actual road load measured by a sliding method under the condition of full load of the vehicle, wherein the two road loads take larger values as the load loaded during the rotary drum test; for the loaded gradient, the actual gradient of the road can be measured by using a level meter, a GPS (global positioning system) and other equipment, and then a plurality of groups of proper gradients are selected for testing, so that the gradient can be adjusted timely;
s4, controlling test boundary conditions: the temperature and the humidity in a laboratory can be controlled through equipment such as an external air conditioner, and the like, and the air speed and the like of the windward can be controlled through adjusting specific parameters of an indoor fan, so that the exhaust temperature of the automobile in a specific environment can be verified and optimized;
s5, selecting proper vehicle speed and gear: the speed ratio and the main speed reduction ratio of the automobile are unchanged, and on the premise that the temperature discharge test can be realized under all working conditions of the automobile, the test verification is carried out according to the minimum speed and the medium-low speed ratio;
S6, confirming a combination mode of working condition points: and selecting a plurality of rotating speed points of the engine as an X axis of the working point combination, and selecting a plurality of load points of the engine as a Y axis of the working point combination.
FIG. 2 is a graph of the results of the exhaust temperature of an automobile under all conditions tested using the method of the present invention, with +representing temperatures exceeding the exhaust temperature limit;
As shown in fig. 2, the engine speed selection may be started at 1600rpm, with a speed point being selected every 400rpm until the highest speed point is selected as the x-axis; the engine load is similar to the principle of selecting the rotating speed, and the engine load is used as the y axis after the selection is finished. Of course, the combination can be freely carried out according to the actual requirement;
S7, utilizing a national six-drum laboratory to perform a temperature discharge verification test under all working conditions of the automobile, wherein the temperature discharge condition of the area in the figure 1 can be focused, and the temperature discharge verification test under all working conditions of the automobile can be performed according to the gear and the speed of the automobile in combination with the steps 3-5 and the figure 2; when the highest exhaust temperature of the automobile is verified, the exhaust temperature test can be carried out under the working condition that the low speed of the automobile is close to the full load by properly increasing the road load and the gradient;
S8, acquiring a temperature discharge result of the automobile of the figure 2 under the full working condition through the steps; analyzing the ignition, air intake and oil injection performance of corresponding working conditions through various sensor signals fed back by an ECU (electronic control unit) acquired by the calibration INCA software in a region with high exhaust temperature, and finally reducing the exhaust temperature of the automobile through measures such as adjusting the mixed gas to obtain an optimized exhaust temperature result shown in the figure 3 so as to meet the project development target; the conclusion can be clearly drawn through the comparison of the front test data and the rear test data: the invention can fully verify and optimize the exhaust temperature of the automobile under the full working condition.
Wherein, figure 3 is a graph of the optimized exhaust temperature results, which represents the temperature below the exhaust temperature limit value, and the exhaust temperature reaches the standard;
it will be understood that the application has been described in terms of several embodiments, and that various changes and equivalents may be made to these features and embodiments by those skilled in the art without departing from the spirit and scope of the application. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the application without departing from the essential scope thereof. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (9)
1. The method for verifying and optimizing the exhaust temperature of the automobile is characterized by comprising the following steps of: the method comprises the following steps:
S1, confirming a test mode;
S2, confirming states of the automobile and the engine;
s3, determining road load and gradient loaded by the rotary drum;
s4, controlling test boundary conditions;
s5, selecting proper vehicle speed and gear;
s6, confirming a combination mode of the working condition points;
S7, performing an automobile full-working-condition temperature discharge verification test process on the rotary drum, and adjusting a test gradient according to a gear position and a vehicle speed in the test by combining working-condition points in S3-S5 and S6 so as to perform the automobile full-working-condition temperature discharge verification test;
S8, acquiring a temperature discharge result of the automobile under the full working condition, and carefully optimizing the area with high temperature discharge.
2. The method for verifying and optimizing the exhaust gas temperature of an automobile according to claim 1, wherein: the experimental mode of S1 is as follows: the test was performed using a national six-drum laboratory.
3. The method for verifying and optimizing the exhaust gas temperature of an automobile according to claim 2, wherein: s2, confirming states of the automobile and the engine, specifically: the state of the automobile and the engine is confirmed to be abnormal, the automobile can be started and operated normally, and the exhaust temperature signal can be monitored and recorded normally.
4. A method for verifying and optimizing an exhaust gas temperature of an automobile according to claim 3, wherein: and S3, determining road load and gradient loaded by the rotary drum, wherein the road load and gradient loaded by the rotary drum are specifically: calculating the road load to be loaded by the rotary drum according to the maximum mass, the reference mass and the vehicle type parameters of the vehicle or using the actual road load measured by a sliding method under the condition of full load of the vehicle, wherein the two road loads take larger values as the load loaded during the rotary drum test; for the loaded grade, the actual road grade is measured using a level or GPS, and then the appropriate grade is selected for testing.
5. The method for verifying and optimizing the exhaust gas temperature of an automobile according to claim 4, wherein: and S4, controlling test boundary conditions, wherein the test boundary conditions specifically comprise: the temperature and the humidity in the laboratory are controlled through an external air conditioner, and the windward speed is controlled through adjusting specific parameters of an indoor fan, so that the exhaust temperature verification and the optimization of the automobile under a specific environment are carried out.
6. The method for verifying and optimizing the exhaust gas temperature of an automobile according to claim 5, wherein: and S5, selecting proper vehicle speed and gear, wherein the vehicle speed and gear are specifically as follows: and on the premise that the temperature discharge test can be realized under all working conditions of the automobile, testing and verification are carried out according to the minimum speed and the medium-low speed ratio.
7. The method for verifying and optimizing the exhaust gas temperature of an automobile according to claim 6, wherein: the combination mode of the confirmation working condition points in the step S6 specifically comprises the following steps: and selecting a plurality of rotating speed points of the engine as an X axis of the working point combination, and selecting a plurality of load points of the engine as a Y axis of the working point combination.
8. The method for verifying and optimizing the exhaust gas temperature of an automobile according to claim 7, wherein: in the step S7, when the highest exhaust temperature of the automobile is verified, the exhaust temperature test is carried out under the working condition of low speed and approaching to full load of the automobile by increasing the road load and the gradient.
9. The method for verifying and optimizing the exhaust gas temperature of an automobile according to claim 8, wherein: in the step S8, the ignition, air inlet and oil injection performances of the corresponding working conditions are analyzed through various sensor signals fed back by the ECU collected by the calibration INCA software, and finally the exhaust temperature of the automobile is reduced through adjusting the mixed gas, so that an optimized exhaust temperature result is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410164243.2A CN118010364A (en) | 2024-02-05 | 2024-02-05 | Automobile exhaust temperature verification and optimization method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410164243.2A CN118010364A (en) | 2024-02-05 | 2024-02-05 | Automobile exhaust temperature verification and optimization method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118010364A true CN118010364A (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410164243.2A Pending CN118010364A (en) | 2024-02-05 | 2024-02-05 | Automobile exhaust temperature verification and optimization method |
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| Country | Link |
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| CN (1) | CN118010364A (en) |
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2024
- 2024-02-05 CN CN202410164243.2A patent/CN118010364A/en active Pending
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