CN113504050B - Carbon deposition and coking test method and device for EGR (exhaust gas Recirculation) system - Google Patents
Carbon deposition and coking test method and device for EGR (exhaust gas Recirculation) system Download PDFInfo
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- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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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
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Abstract
The embodiment of the invention provides a method and a device for testing carbon deposition and coking of an EGR (exhaust gas recirculation) system, wherein the method comprises the steps of obtaining an engine working condition point of an engine; then, determining an EGR working condition point of the EGR system from the working condition points of the engine based on the emission data of the engine and the working condition time ratio; then, based on the EGR working condition point, carrying out a cycle test on the EGR system, and monitoring working condition parameters of the EGR working condition point; then obtaining a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions; and finally, obtaining a carbon deposition and coking test result of the EGR system based on the part detection result. The method can well and accurately test the risk of carbon deposition and coking of the EGR system, and verifies the reliability and the design rationality of the EGR system for evaluation.
Description
Technical Field
The invention relates to the technical field of automobile engines, in particular to a carbon deposition and coking test method and device for an EGR (exhaust gas recirculation) system.
Background
The engine Exhaust Gas Recirculation (EGR) technology is a technology of returning part of Exhaust Gas discharged from an engine to an intake system and Re-entering a cylinder together with fresh air mixture to participate in combustion. Because the waste gas contains a large amount of CO 2 Equal polyatomic gas, and CO 2 The gas cannot be combusted, but absorbs a large amount of heat due to high specific heat capacity, so that the maximum combustion temperature of the gas mixture in the cylinder is reduced; meanwhile, after the waste gas is introduced into the cylinder, the oxygen concentration is reduced, so that the generation of NOx is greatly reduced. Moreover, EGR is introduced under the working condition of small load of the engine, so that the air intake pumping loss can be reduced, and the fuel consumption can be reduced; meanwhile, as the highest combustion temperature is reduced, the knocking tendency of the engine is obviously improved, the compression ratio of the engine is favorably improved, the ignition advance is favorably realized, and the oil consumption can be further improved. With the continuous tightening of fuel consumption and emission regulations, if a traditional vehicle wants to have good market competitiveness, the combustion thermal efficiency of an engine needs to be continuously improved. Under the background, the EGR technology is basically used in the newly developed high-heat-efficiency engineIs in a standard configuration.
In order to achieve better energy conservation and emission reduction effects, the proportion of the EGR use area in the whole engine MAP graph (control curve graph) is larger. The EGR is used in a low-speed low-load area, because the exhaust temperature is low, the EGR rate is not high, the water temperature does not reach the target water temperature, the gas temperature after the EGR is cooled is low, and carbon smoke particles, colloid and other substances in the waste gas are more easily adsorbed on the heat exchange surface of the EGR cooler, so that carbon deposition and coking on the gas side heat exchange surface of the EGR cooler are serious after the EGR cooler is used for a long time; in addition, if the content of soot emissions is high and the exhaust gas flow is large at a certain working condition point, the possibility of serious blockage caused by the acceleration of the adsorption rate also exists; the above conditions will seriously affect the energy-saving and emission-reducing effects of the EGR system, and have the risks of causing the vehicle emission to exceed the standard, and possibly causing the risks of damaging engine parts in serious cases.
However, at present, the carbon deposition and coking risk of the EGR system cannot be verified and evaluated well because the test for the carbon deposition and coking of the EGR system is not accurate enough.
Disclosure of Invention
In view of the above problems, the invention provides a method and a device for testing carbon deposition and coking of an EGR system, which can test the carbon deposition and coking of the EGR system more accurately, verify the carbon deposition and coking risk of the EGR system better and evaluate the design rationality of the EGR system.
In a first aspect, the present application provides the following technical solutions through an embodiment:
a carbon deposition and coking test method for an EGR system comprises the following steps:
acquiring an engine working condition point of an engine; determining an EGR operating point of the EGR system from the operating points of the engine based on emission data and operating time ratio of the engine; performing a cycle test on the EGR system based on the EGR working condition point, and monitoring working condition parameters of the EGR working condition point; acquiring a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions; and obtaining a carbon deposition and coking test result of the EGR system based on the part detection result.
Optionally, the determining an EGR operating point of the EGR system from the engine operating points based on the emission data of the engine and the operating time ratio comprises:
determining an engine working condition point where the maximum value of the first emission data and the minimum value of the second emission data are located as the EGR working condition point; wherein the first discharge data includes: soot emission value, HC emission value, exhaust gas flow value; the second emission data includes: EGR outlet temperature value; when an EGR valve of the EGR system is opened, determining n engine working condition points with the largest working condition time ratio as the EGR working condition points; wherein n is an integer of not less than 1.
Optionally, the operating condition parameters include: the EGR cooler inlet air temperature, the EGR cooler inlet water temperature, the EGR cooler outlet water temperature, the EGR valve inlet air temperature and the EGR cooler outlet air temperature; the working condition parameters meet the preset test conditions, including the following conditions:
the deviation of the EGR cooler intake air temperature is not greater than a first temperature threshold; the deviation of the EGR cooler inlet water temperature is not greater than a second temperature threshold; the deviation of the EGR cooler outlet water temperature is not greater than a third temperature threshold; the deviation of the EGR valve intake air temperature is not greater than a fourth temperature threshold; and the deviation of the EGR cooler outlet gas temperature is not greater than a fifth temperature threshold.
Optionally, the working condition parameter satisfies the preset test condition, and further includes the following conditions:
the EGR valve inlet temperature is greater than the EGR cooler inlet temperature; the EGR cooler inlet air temperature is greater than the EGR cooler outlet air temperature.
Optionally, the operating condition parameters include: the method comprises the following steps of (1) enabling air inlet pressure of an EGR cooler, water inlet pressure of the EGR cooler, water outlet pressure of the EGR cooler, air inlet pressure of an EGR valve and air outlet pressure of the EGR cooler to be in communication with each other; the working condition parameters meet the preset test conditions, including the following conditions:
the water inlet pressure of the EGR cooler is greater than the water outlet pressure of the EGR cooler; the EGR valve intake pressure is greater than the EGR cooler intake pressure; and the EGR cooler inlet pressure is greater than the EGR cooler outlet pressure.
Optionally, the part detection result includes an appearance detection result and a performance detection result; the step of obtaining a carbon deposition and coking test result of the EGR system based on the part detection result comprises the following steps:
judging whether the appearance detection result is qualified or not; judging whether the performance deviation between the performance detection result and the performance before the test is within a preset deviation range; if so, determining that the carbon deposition and coking test result of the EGR system is qualified; and if not, determining that the carbon deposition and coking test result of the EGR system is unqualified.
In a second aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
the utility model provides a carbon deposit coking testing arrangement of EGR system, includes:
the first acquisition module is used for acquiring an engine working condition point of the engine; the determination module is used for determining an EGR operating point of the EGR system from the operating points of the engine based on emission data and operating time ratio of the engine; the test module is used for carrying out a circulation test on the EGR system based on the EGR working condition point and monitoring working condition parameters of the EGR working condition point; the second acquisition module is used for acquiring a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions; and the detection module is used for obtaining a carbon deposition and coking test result of the EGR system based on the part detection result.
Optionally, the determining module is specifically configured to:
determining an engine working condition point where the maximum value of the first emission data and the minimum value of the second emission data are located as the EGR working condition point; wherein the first discharge data includes: soot emission value, HC emission value, exhaust gas flow value; the second emission data includes: EGR outlet temperature value; when an EGR valve of the EGR system is opened, determining n engine working condition points with the largest working condition time ratio as the EGR working condition points; wherein n is an integer of not less than 1.
Optionally, the operating condition parameters include: the EGR cooler inlet air temperature, the EGR cooler inlet water temperature, the EGR cooler outlet water temperature, the EGR valve inlet air temperature and the EGR cooler outlet air temperature; the second obtaining module is used for obtaining the part detection result of the EGR system which completes the cycle test under the following working condition:
the deviation of the EGR cooler intake air temperature is not greater than a first temperature threshold; the deviation of the EGR cooler inlet water temperature is not greater than a second temperature threshold; the deviation of the EGR cooler outlet water temperature is not greater than a third temperature threshold; the deviation of the EGR valve intake air temperature is not greater than a fourth temperature threshold; and the deviation of the EGR cooler outlet gas temperature is not greater than a fifth temperature threshold.
In a third aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment:
a computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of any one of the above-mentioned first aspects.
According to the method and the device for testing carbon deposition and coking of the EGR system, provided by the embodiment of the invention, the working condition points of the engine are obtained; then, determining an EGR working condition point of the EGR system from the working condition points of the engine based on the emission data of the engine and the working condition time ratio; then, based on the EGR working condition point, carrying out a cycle test on the EGR system, and monitoring working condition parameters of the EGR working condition point; then obtaining a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions; and finally, obtaining a carbon deposition and coking test result of the EGR system based on the part detection result. The working condition points of the cycle test in the embodiment of the invention are based on the proportion of the emission data and the working condition time, and can well cover severe and common working condition environments; then, a part detection result of the EGR system of the engine is judged in a circulation test mode, the part detection result is obtained under the preset test condition limit, the whole circulation test process and the obtained part detection result are more reliable, finally, the carbon deposition and coking test result of the EGR system also has higher reliability, and the reliability and the design rationality of the EGR system can be well evaluated.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts. In the drawings:
FIG. 1 is a flow chart illustrating a method for testing carbon deposition and coking in an EGR system according to a first embodiment of the invention;
FIG. 2 shows a front view of a part of an EGR system being tested in a first embodiment of the present invention;
FIG. 3 shows a left side view of EGR system components tested in a first embodiment of the present invention;
FIG. 4 shows an EGR operating point distribution and proportion statistical map for a complete vehicle WLTC cycle in accordance with a first embodiment of the present invention;
FIG. 5 shows a carbon deposit and coking condition operation diagram of an EGR system in a first embodiment of the invention;
FIG. 6 shows a schematic structural diagram of a carbon deposition and coking test device of an EGR system according to a second embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
First embodiment
Referring to fig. 1, a method for testing carbon deposition and coking of an EGR system according to a first embodiment of the present invention is shown, where the method includes:
step S10: an engine operating point of the engine is obtained.
In step S10, the fuel type of the engine and the type of the vehicle to be used are not limited, and the fuel type may be a diesel engine, a gasoline engine, or the like; the vehicle type may be a car, a passenger car, a van, etc. The engine operating point can be obtained by detection and calculation according to the existing test standard. For example, a fuel consumption and emission test cycle is performed according to WLTC (a fuel consumption and emission test standard, global light vehicle test cycle), and an engine operating point is determined by calculation. In addition, the time ratio of the corresponding engine working condition points can be determined, and the working intervals of the EGR system are compared, so that a series of working condition points of the EGR system are selected. The operating points include engine speed, BMEP (Brake Mean Effective Pressure), torque, and the like.
Further, in order to accurately collect the test process data, the following processing needs to be performed on the engine in this embodiment:
firstly, performing appearance inspection and single body performance test on parts of an EGR system of an engine; the appearance inspection and the individual performance test can be performed according to the existing technical standards, and each part of the EGR system is ensured to meet the performance requirement before the test and has no defects.
And then, processing a temperature measuring through hole and a pressure measuring through hole on the EGR cooler, the EGR air inlet pipe and the EGR air outlet pipe of the EGR system to be tested. Respectively installing a temperature sensor and a pressure sensor on corresponding measuring through holes according to assembly specifications, and smearing a high-temperature-resistant sealing ring on a thread matching position to ensure that the assembly position has no leakage; the various components of the EGR system were assembled to the test engine according to the assembly process. Specifically, a structural schematic diagram and a measuring point layout diagram of the EGR system are shown in FIGS. 2 and 3, wherein FIG. 2 is a front view of a component of the EGR system, and FIG. 3 is a left view of the component of the EGR system; which comprises the following steps: the device comprises an EGR valve 1, an EGR cooler 2, an EGR cooler inlet air temperature measuring point 2.1, an EGR cooler inlet air pressure measuring point 2.2, an EGR cooler inlet water temperature measuring point 2.3, an EGR cooler inlet water pressure measuring point 2.4, an EGR cooler outlet water temperature measuring point 2.5, an EGR cooler outlet water pressure measuring point 2.6, an EGR inlet pipe 3, an EGR valve inlet air temperature measuring point 3.1, an EGR valve inlet air pressure measuring point 3.2, an EGR outlet pipe 4, an EGR cooler outlet air temperature 4.1 and an EGR cooler outlet air pressure measuring point 4.2.
Then, detecting the air tightness of the EGR system on an engine bench, and connecting bench measuring equipment and a temperature and pressure test channel of EGR system parts; namely, the plug-in connector of the temperature and pressure sensor arranged on the EGR system part is connected to the measurement acquisition equipment of the bench; real-time measurement of engine oil consumption is required in the test.
Finally, running in the engine by using a running-in standard, and recording external characteristic data of the engine; and the external characteristic data before the engine test is ensured to be normal.
The data accuracy of the subsequent test stage can be ensured by the operation of the preparation stage before the test.
Step S20: an EGR operating point of the EGR system is determined from the engine operating points based on emission data of the engine and the operating time ratio.
In step S20, EGR operating points may be obtained from the engine operating points, and in order to improve the reliability of the test results, the EGR operating points are selected based on or near a limit value of the emission data of the engine in the present embodiment. Thereby ensuring more severe test conditions. Specifically, the emission data includes: first discharge data: soot emission values, HC (hydrocarbon) emission values, and exhaust gas flow values; second emission data: and (4) EGR outlet gas temperature value. Specifically, the operating point where the maximum value of the first emission data and the minimum value of the second emission data are located can be determined as the EGR operating point, so that the EGR system can be tested more strictly, and the reliability of the test result is ensured.
Furthermore, the condition points are prevented from not conforming to the actual use scene of the user. In this embodiment, the working condition points can be screened according to the working condition time ratio, so that the tested working condition points can better cover the actual application scene. The duty cycle ratio represents the proportion of the total engine operating time to the total operating time at all operating points at that operating point.
Specifically, step S20 includes:
step S21: determining an engine working condition point where the maximum value of the first emission data and the minimum value of the second emission data are located as the EGR working condition point; wherein the first discharge data includes: soot emission value, HC emission value, exhaust gas flow value; the second emission data includes: EGR outlet temperature value;
step S22: determining n engine working condition points with the maximum working condition time ratio when an EGR valve of the EGR system is opened as the EGR working condition points; wherein n is an integer of not less than 1.
The execution order of step S21 and step S22 is not limited. The working points under a plurality of limit conditions can be obtained through the step S21, the application scene with the widest coverage can be obtained through the step S22, and the test reliability under the application scene with the highest proportion of the running time of the engine is ensured when the EGR system works. Therefore, the working condition points determined by the step S21 and the step S22 can better reflect the limit conditions and the actual application scenes of the experiment, and the full coverage of the experiment is realized. In step S22, n may take on values of 1, 2, 3, 4, and so on. An idle condition should be included when n takes 1, and an idle condition and a shutdown condition may be included when n takes 2. In addition, in order to quickly deposit and adhere particles and colloid in the exhaust gas of the EGR system, part of idling working conditions can be converted into shutdown working conditions, and the check strength is enhanced; for example, the idle condition when decelerating to idle may be converted to a shutdown condition for testing.
Referring to fig. 4, it can be seen in fig. 4 that the left table is the engine speed, BMEP, torque, time ratio corresponding to the engine operating point 14 before the time ratio in a complete test cycle of the WLTC cycle measured for the vehicle. As can be seen from the EGGR open MAP, the EGR system is not active for all operating regions of the engine, the EGR valve is only open at engine operating points in the annular region, and the EGR system is only active in these regions. The working condition points hooked in the WLTC circulation table all fall within the working area of the EGR system, namely the working condition point selected in the step S22 should be within the working area of the EGR system, and the testing effectiveness is guaranteed.
Step S30: and carrying out a circulation test on the EGR system based on the EGR working condition point, and monitoring the working condition parameters of the EGR working condition point.
In step S30, a working condition operation table or operation diagram of one cycle test may be determined before the cycle test is performed. Taking the operating condition operating table as an example, the operating condition operating table may be determined empirically according to actual rotational speeds, for example, different operating times may be assigned to each EGR operating point, and the operating times of the EGR operating points may be determined based on the distribution of the EGR operating points and the fraction statistics in the WLTC cycle of the entire vehicle. Specifically, the running time proportion of a certain target EGR working condition point in the WLTC cycle to all EGR working condition points is used as the proportion of the target EGR working condition point in the cycle test.
For example, referring to fig. 5, the running distance of the entire vehicle life cycle can be estimated to 15 kilometers, and the running time corresponding to each EGR operating point within the running distance can be obtained; considering the idle operating condition, the shutdown cooling operating condition and the time ratio of each EGR operating condition point, the running time of each EGR operating condition point is distributed as shown in FIG. 3, the duration of one cycle is 2700s, and about 1800 cycle tests are required to be completed in total.
The distribution of the running time by the method can ensure that the test is closer to the actual application scene and the reliability of the test result is ensured.
Further, monitoring operating condition parameters of the EGR operating point comprises: EGR cooler intake air temperature, EGR cooler intake water temperature, EGR cooler outlet water temperature, EGR valve intake air temperature, EGR cooler outlet air temperature, engine speed, torque, EGR valve opening, and the like.
The sampling of above-mentioned operating mode parameter can be for the temperature measurement through-hole and the pressure measurement through-hole realization of processing on the engine EGR system, can adopt the engine rack to monitor the sampling during the sampling, and sampling frequency is 1Hz, and the operating mode data of sampling is copied at regular intervals every day, carries out analysis processes to the data in the rack data record appearance. The obtained operating condition parameters may be used to periodically verify whether the test satisfies preset test conditions in the test process, and the preset test conditions will be set forth in the subsequent step S40.
Step S40: acquiring a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions.
In step S40, the operating parameters of the engine may be checked according to a preset period, and the preset test conditions may be determined during the checking. The predetermined period may be daily, every 0.5 days, every 5 hours, etc., without limitation. Better, can confirm to predetermine the cycle for every day, accord with the user to the use habit of vehicle more, use by day, have longer rest time evening, also guaranteed certain frequency of point inspection, avoid can not even discover the engine unusual problem. The working condition parameters meet preset test conditions, including the following conditions:
the deviation of the EGR cooler intake air temperature is not greater than a first temperature threshold; the deviation of the inlet water temperature of the EGR cooler is not greater than a second temperature threshold; the deviation of the EGR cooler outlet water temperature is not greater than a third temperature threshold; the deviation of the EGR valve intake air temperature is not greater than a fourth temperature threshold; and the deviation of the EGR cooler outlet gas temperature is not greater than a fifth temperature threshold. Specifically, the temperature deviation may be large or small. When the temperature deviation is judged, the judgment can be carried out in the same cycle process. The first temperature threshold may be 5 deg.c, the second temperature threshold may be 2 deg.c, the third temperature threshold may be 2 deg.c, the fourth temperature threshold may be 20 deg.c, and the fifth temperature threshold may be 5 deg.c. The temperature threshold may be adaptively adjusted according to the accuracy, for example, the first temperature threshold, the second temperature threshold, and the third temperature threshold may be adjusted within ± 1.5 ℃ of the current value, the fourth temperature threshold may be adjusted within ± 5 ℃ of the current value, and the fifth temperature threshold may be adjusted within ± 2 ℃ of the current value, which is beneficial to flexible configuration. And determining whether the temperature of each measuring point of the EGR system is within the deviation range or not through the temperature threshold value, thereby determining whether the EGR system is stable or not in the test process and ensuring the test process to be accurately carried out.
Further, the working condition parameters meet preset test conditions, and the following conditions can be met:
the inlet air temperature of the EGR valve is higher than that of the EGR cooler; the EGR cooler inlet air temperature is greater than the EGR cooler outlet air temperature. Whether the air inlet and exhaust systems or the temperature sensor of the engine have faults can be further confirmed through the judging process; specifically, whether the temperature sensor is damaged or not, whether the insertion depth is proper or not, whether the air leakage phenomenon exists in an air inlet and exhaust system of the engine or not, and the like.
In addition, the following working condition parameters can be added: the EGR cooler comprises EGR cooler air inlet pressure, EGR cooler water outlet pressure, EGR valve air inlet pressure and EGR cooler air outlet pressure. At this moment, the working condition parameters meet the preset test conditions, and the following conditions can be further met:
the water inlet pressure of the EGR cooler is greater than the water outlet pressure of the EGR cooler; the intake pressure of the EGR valve is greater than the intake pressure of the EGR cooler; and the EGR cooler inlet pressure is greater than the EGR cooler outlet pressure. Whether the air inlet and exhaust systems or the pressure sensor of the engine have faults can be further confirmed through the judgment process; specifically, whether the pressure sensor is damaged or not, whether the insertion depth is proper or not, whether the air leakage phenomenon exists in an air inlet and exhaust system of the engine or not, and the like.
It should be noted that, if the working condition parameters do not satisfy any preset test condition, the test is stopped, the engine and the sensor are subjected to troubleshooting until the monitoring parameters of the engine are recovered to be normal, and the test is continued to ensure the reliability of the test result.
After the circulation test is completed in a preset state, each part of the EGR system can be detected again, and the tested part of the EGR system can be retested with the external characteristics of the engine according to the test working condition of the external characteristics of the engine to obtain an appearance detection result; and performing performance detection on the tested EGR system parts to obtain performance detection results. Specifically, the parts tested were as follows: the EGR valve is used for performing appearance inspection, flow resistance characteristic test, leakage test, response time test and electroless return time test; the EGR cooler (containing an O-shaped sealing ring) is subjected to appearance inspection, dirt coefficient test, air outlet temperature test and flow resistance characteristic test; an EGR gas inlet pipe for appearance inspection and leakage test; the EGR outlet pipe is used for performing appearance inspection and leakage test; and an EGR gasket for appearance inspection. The detection standards and methods for the above components can be performed according to the current standards in the industry, which are described in this embodiment. And respectively obtaining the appearance detection result and the performance detection result of each part after the detection is finished.
Step S50: and obtaining a carbon deposition and coking test result of the EGR system based on the part detection result.
Step S50 specifically includes:
step S51: and judging whether the appearance detection result is qualified.
In step S51, if the appearance detection result shows that there is no breakage or crack. Comparing the appearance detection result with the external characteristic result of the engine after running-in before the test, and judging that no abnormity exists if the performance difference of each part corresponding to the working condition is less than or equal to +/-1.5%; otherwise, it is determined that there is an abnormality. If the external characteristics are abnormal, the system needs to analyze the test data related to air intake, exhaust and the supercharger and check whether the engine has air leakage or not.
Step S52: and judging whether the performance deviation between the performance detection result and the performance before the test is within a preset deviation range.
In step S52, the determination process may be performed simultaneously with step S51, or performed first or later. Preferably, step S51 may be executed first, and the external characteristic determination process logic is simpler, so that the resource consumption of the determination can be reduced. When step S52 is executed, the performance detection result for each component can be determined. However, in this embodiment, in order to improve the determination efficiency, the determination may be performed according to the following sequence based on the performance stability: an EGR valve; EGR coolers (containing O-rings); an EGR intake pipe; an EGR outlet pipe; an EGR gasket. And after the test, the performance detection result of each part still meets the specified drawing or technical requirement, and then the part is qualified. Through the judgment of each part, the risk of carbon deposition and coking of the EGR system and the reliability of the system can be verified, and the design rationality of the EGR system can be better confirmed.
In addition, the following tests may be added to improve accuracy: and carrying out opening change test on the EGR valve after the test is finished. When the performance detection result of the EGR valve is qualified, if the opening change of the EGR valve at the same working condition point before and after the test is finished exceeds +/-2%, whether the opening of a throttle valve and the pressure of an air inlet pipeline and an exhaust pipeline are abnormal or not needs to be checked, if the performance of related parts is changed in the test, the parts need to be replaced, the test conditions are kept consistent, whether the opening change of the EGR valve is within +/-2% requirements or not is judged, and if the opening change of the EGR valve still exceeds the design target, the EGR system needs to be detached and then checked; if the opening change of the EGR valve at the same working condition point before and after the test is finished is within +/-2%, directly detaching the EGR system part from the engine for analysis, and mainly checking the performance change of the EGR valve and the EGR cooler.
If the step S51 and the step S52 are both qualified, determining that the carbon deposition and coking test result of the EGR system is qualified; and if the step S51 and the step S52 are not qualified, determining that the carbon deposition and coking test result of the EGR system is not qualified.
Further, in actual generation, if the performance test result of the EGR valve does not meet the design requirement, disassembly analysis can be carried out, and the matching size of each sub-part, the surface roughness and the abrasion condition of a moving part, and the electrical parameters and the driving force of the motor are mainly checked. And comparing the measured value after the test with the normal initial parameter value of the EGR valve, and analyzing the reason why the performance does not reach the standard. If all the above checks are within the normal range, a qualified report approved by the final test can be provided. If the performance test result of the EGR cooler does not meet the design requirement, anatomical analysis can be carried out, the carbon deposition and coking conditions on the surface of the gas channel are mainly checked, the component analysis is carried out on the carbon deposition and coking materials, which component is in the engine exhaust gas is judged, and an analysis report is provided.
Therefore, the standardized test method and test working conditions are formulated in the embodiment, and the representativeness of the carbon deposition and coking conditions of the EGR system, particularly the EGR cooler after long-term use is ensured; and test evaluation items and evaluation benchmarks are also determined, and the risk of carbon deposition and coking of the EGR system is effectively evaluated.
In summary, the present embodiment provides
A carbon deposition and coking test method for an EGR system comprises the steps of obtaining an engine working condition point of an engine through an engine universal characteristic MAP; then, determining an EGR working condition point of the EGR system from the working condition points of the engine according to the emission data of each working condition point when the EGR is started to work and the working condition time ratio in the WLTC test; then, based on the EGR working condition point, carrying out a cycle test on the EGR system, and monitoring working condition parameters of the EGR working condition point; then obtaining a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions; and finally, obtaining a carbon deposition and coking test result of the EGR system based on the part detection result. The working condition points of the cycle test in the embodiment are based on the proportion of the emission data and the working condition time, and can well cover severe and common working condition environments; then, a part detection result of the EGR system of the engine is judged in a circulation test mode, the part detection result is obtained under the preset test condition limit, the whole circulation test process and the obtained part detection result are more reliable, finally, the carbon deposition and coking test result of the EGR system also has higher reliability, and the reliability and the design rationality of the EGR system can be well evaluated.
Second embodiment
Referring to fig. 6, a second embodiment of the present invention provides a device 300 for testing carbon deposition and coking in an EGR system based on the same inventive concept. EGR system carbon deposit coking testing arrangement 300 includes:
the first acquisition module 301 is used for acquiring an engine working condition point of an engine; a determination module 302 to determine an EGR operating point of the EGR system from the engine operating points based on emission data and operating time ratios of the engine; the test module 303 is configured to perform a cycle test on the EGR system based on the EGR operating point, and monitor an operating parameter of the EGR operating point; the second obtaining module 304 is used for obtaining a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions; and the detection module 305 is used for obtaining a carbon deposition and coking test result of the EGR system based on the part detection result.
As an optional implementation manner, the determining module 302 is specifically configured to:
determining an engine working condition point where the maximum value of the first emission data and the minimum value of the second emission data are located as the EGR working condition point; wherein the first discharge data includes: soot emission value, HC emission value, exhaust gas flow value; the second emission data includes: EGR outlet temperature value; when an EGR valve of the EGR system is opened, determining n engine working condition points with the largest working condition time ratio as the EGR working condition points; wherein n is an integer of not less than 1.
As an alternative embodiment, the operating condition parameters include: the air inlet temperature of the EGR cooler, the water outlet temperature of the EGR cooler, the air inlet temperature of the EGR valve and the air outlet temperature of the EGR cooler are measured; the second obtaining module 304 is configured to obtain the part detection result of the EGR system after the cycle test is completed under the following operating conditions:
the deviation of the EGR cooler intake air temperature is not greater than a first temperature threshold; the deviation of the EGR cooler inlet water temperature is not greater than a second temperature threshold; the deviation of the EGR cooler outlet water temperature is not greater than a third temperature threshold; the deviation of the EGR valve intake air temperature is not greater than a fourth temperature threshold; and the deviation of the EGR cooler outlet gas temperature is not greater than a fifth temperature threshold.
As an alternative embodiment, the second obtaining module 304 is further configured to obtain the part detection result of the EGR system after completing the cycle test under the following operating conditions:
the EGR valve inlet temperature is greater than the EGR cooler inlet temperature; the EGR cooler inlet air temperature is greater than the EGR cooler outlet air temperature.
As an alternative embodiment, the operating condition parameters include: the air inlet pressure of the EGR cooler, the water outlet pressure of the EGR cooler, the air inlet pressure of the EGR valve and the air outlet pressure of the EGR cooler are controlled by the control system; the second obtaining module 304 is further configured to obtain the part detection result of the EGR system after completing the cycle test under the following operating conditions:
the water inlet pressure of the EGR cooler is greater than the water outlet pressure of the EGR cooler; the EGR valve intake pressure is greater than the EGR cooler intake pressure; and, the EGR cooler inlet pressure is greater than the EGR cooler outlet pressure.
As an optional implementation manner, the part detection result includes an appearance detection result and a performance detection result; the detection module 305 is specifically configured to:
judging whether the appearance detection result is qualified or not; judging whether the performance deviation between the performance detection result and the performance before the test is within a preset deviation range; if so, determining that the carbon deposition and coking test result of the EGR system is qualified; and if not, determining that the carbon deposition and coking test result of the EGR system is unqualified.
It should be noted that the implementation and technical effects of the EGR system soot and coke deposition testing apparatus 300 provided by the embodiment of the present invention are the same as those of the foregoing method embodiment, and for the sake of brief description, reference may be made to the corresponding contents in the foregoing method embodiment to the extent that the apparatus embodiment is not mentioned in part.
Third embodiment
Based on the same inventive concept, the third embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method according to any one of the first aspect described above.
It should be noted that, in the computer-readable storage medium provided by the embodiment of the present invention, when the program is executed by the processor, the specific implementation of each step and the technical effect produced by the step are the same as those of the foregoing method embodiment, and for the sake of brief description, for the sake of brevity, no mention in this embodiment may be made to the corresponding contents in the foregoing method embodiment.
The term "and/or" appearing herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; the word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A carbon deposition and coking test method for an EGR system is characterized by comprising the following steps:
acquiring an engine working condition point of an engine;
determining an EGR operating point of the EGR system from the operating points of the engine based on emission data and operating time ratio of the engine;
performing a cycle test on the EGR system based on the EGR working condition point, and monitoring working condition parameters of the EGR working condition point;
acquiring a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions;
based on the part detection result, obtaining a carbon deposition and coking test result of the EGR system;
the determining an EGR operating point of the EGR system from the engine operating points based on the emission data of the engine and the operating time ratio comprises: determining an engine working condition point where the maximum value of the first emission data and the minimum value of the second emission data are located as the EGR working condition point; wherein the first discharge data includes: soot emission value, HC emission value, exhaust gas flow value; the second emission data includes: EGR outlet temperature value; when an EGR valve of the EGR system is opened, determining n engine working condition points with the largest working condition time ratio as the EGR working condition points; wherein n is an integer of not less than 1.
2. The method of claim 1, wherein the operating condition parameters comprise: the EGR cooler inlet air temperature, the EGR cooler inlet water temperature, the EGR cooler outlet water temperature, the EGR valve inlet air temperature and the EGR cooler outlet air temperature; the working condition parameters meet the preset test conditions, including the following conditions:
the deviation of the EGR cooler intake air temperature is not greater than a first temperature threshold;
the deviation of the EGR cooler inlet water temperature is not greater than a second temperature threshold;
the deviation of the EGR cooler outlet water temperature is not greater than a third temperature threshold;
the deviation of the EGR valve intake air temperature is not greater than a fourth temperature threshold;
and the deviation of the EGR cooler outlet gas temperature is not greater than a fifth temperature threshold.
3. The method of claim 2, wherein the operating condition parameters satisfy the preset test conditions, further comprising satisfying the following conditions:
the EGR valve inlet temperature is greater than the EGR cooler inlet temperature;
the EGR cooler inlet air temperature is greater than the EGR cooler outlet air temperature.
4. The method of claim 1, wherein the operating condition parameters comprise: the air inlet pressure of the EGR cooler, the water outlet pressure of the EGR cooler, the air inlet pressure of the EGR valve and the air outlet pressure of the EGR cooler are controlled by the control system; the working condition parameters meet the preset test conditions, including the following conditions:
the water inlet pressure of the EGR cooler is greater than the water outlet pressure of the EGR cooler;
the EGR valve intake pressure is greater than the EGR cooler intake pressure;
and, the EGR cooler inlet pressure is greater than the EGR cooler outlet pressure.
5. The method of claim 1, wherein the part inspection results include appearance inspection results and performance inspection results; the step of obtaining a carbon deposition and coking test result of the EGR system based on the part detection result comprises the following steps:
judging whether the appearance detection result is qualified or not;
judging whether the performance deviation between the performance detection result and the performance before the test is within a preset deviation range;
if so, determining that the carbon deposition and coking test result of the EGR system is qualified;
and if not, determining that the carbon deposition and coking test result of the EGR system is unqualified.
6. The utility model provides a carbon deposit coking testing arrangement of EGR system which characterized in that includes:
the first acquisition module is used for acquiring an engine working condition point of the engine;
the determination module is used for determining an EGR operating point of the EGR system from the operating points of the engine based on emission data and operating time ratio of the engine;
the test module is used for carrying out a circulation test on the EGR system based on the EGR working condition point and monitoring working condition parameters of the EGR working condition point;
the second acquisition module is used for acquiring a part detection result of the EGR system after the engine completes a cycle test in a preset state; the preset state indicates that the working condition parameters of each preset period meet preset test conditions;
the detection module is used for obtaining a carbon deposition and coking test result of the EGR system based on the part detection result;
the determining module is specifically configured to: determining an engine working condition point where the maximum value of the first emission data and the minimum value of the second emission data are located as the EGR working condition point; wherein the first discharge data includes: soot emission value, HC emission value, exhaust gas flow value; the second emission data includes: EGR outlet temperature value; when an EGR valve of the EGR system is opened, determining n engine working condition points with the largest working condition time ratio as the EGR working condition points; wherein n is an integer of not less than 1.
7. The apparatus of claim 6, wherein the operating condition parameters comprise: the EGR cooler inlet air temperature, the EGR cooler inlet water temperature, the EGR cooler outlet water temperature, the EGR valve inlet air temperature and the EGR cooler outlet air temperature; the second obtaining module is used for obtaining the part detection result of the EGR system which completes the cycle test under the following working condition:
the deviation of the EGR cooler intake air temperature is not greater than a first temperature threshold;
the deviation of the EGR cooler inlet water temperature is not greater than a second temperature threshold;
the deviation of the EGR cooler outlet water temperature is not greater than a third temperature threshold;
the deviation of the EGR valve intake air temperature is not greater than a fourth temperature threshold;
and the deviation of the EGR cooler outlet gas temperature is not greater than a fifth temperature threshold.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
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| CN114562396B (en) * | 2022-03-28 | 2022-12-20 | 江铃汽车股份有限公司 | Method for verifying reliability of low-temperature working condition of EGR (exhaust gas Recirculation) system |
| CN116256176B (en) * | 2023-03-24 | 2024-04-16 | 四川大学 | Carbon deposition nondestructive testing method applicable to interior of engine heat exchange channel |
| CN117418972B (en) * | 2023-12-19 | 2024-04-16 | 潍柴动力股份有限公司 | Fault detection method and control device for EGR (exhaust gas Recirculation) cooler |
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