Engine friction work test method, system, computer device and storage medium

Abstract

The application relates to an engine friction work test method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: starting an engine, sampling performance boundary parameters and engine parameters of multiple test points of the engine within a test period, and obtaining performance boundary parameter sampling data and engine parameter sampling data of each test point within the test period; determining a first overall engine friction work distribution diagram corresponding to the state of the engine within the test period according to friction average effective pressure sampling data of the multiple test points; and judging whether to output the first overall engine friction work distribution diagram according to the performance boundary parameter sampling data of the multiple test points. The friction work of the engine in the running state is tested by the method, the influence of high temperature and high pressure generated by in-cylinder combustion on the working state of each friction pair and accessory of the engine can be considered, and the test accuracy of the friction work is improved. Moreover, the real friction reduction effect of various friction reduction schemes can be tested.

Description

Technical Field

[0001] This application relates to the field of engine technology, and in particular to an engine friction work testing method, system, computer equipment, storage medium, and computer program product. Background Technology

[0002] To meet increasingly stringent fuel consumption and emission regulations in the automotive industry, global engine manufacturers have researched various technological approaches aimed at developing high-performance engines, primarily including efficient combustion, efficient turbocharging, friction reduction, and intelligent accessories. Among these, reducing engine friction not only achieves significant fuel savings with minimal engine modifications but also provides crucial guidance for further improving engine efficiency, thus attracting considerable attention from manufacturers. The effectiveness of friction reduction is generally determined through friction work testing.

[0003] In related technologies, the reverse-dragging method is generally used to test engine friction work. Specifically, a process oil pan is installed at the bottom of the test engine. The constant-temperature oil inlet and outlet of the process oil pan are connected to a constant-temperature oil system. Through the constant-temperature oil system and an electric dynamometer, the test engine is kept running stably under test conditions. Once the coolant and oil temperatures reach the required levels, the oil supply or ignition is quickly cut off, and the dynamometer is switched to electric motor operation. The engine is then reverse-draggled to the same speed while maintaining constant coolant and oil temperatures, thereby measuring the overall friction work of the engine. This method requires the friction work test to be performed with the engine off-fire. Therefore, the large deviation between the cylinder pressure and the actual operating pressure can lead to inaccurate friction work test results. Summary of the Invention

[0004] Therefore, it is necessary to provide an accurate method, apparatus, computer equipment, computer-readable storage medium, and computer program product for testing engine friction work, addressing the aforementioned technical problems.

[0005] Firstly, this application provides a method for testing the frictional work of an engine. The method includes:

[0006] Start the engine and sample the performance boundary parameters and engine parameters at multiple test points during the test cycle. Obtain the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle. The performance boundary parameters include at least one of humidity, temperature, or pressure. The engine parameters include the average effective friction pressure.

[0007] Based on the sampling data of the average effective friction pressure at multiple test points, the first whole-machine friction work distribution diagram corresponding to the state of the engine during the test cycle is determined.

[0008] Based on the performance boundary parameter sampling data from multiple test points, determine whether to output the first overall friction work distribution diagram.

[0009] In one embodiment, the method further includes:

[0010] Obtain the target value of the performance boundary parameter and control the difference between the engine's performance boundary parameter and the target value to be less than a preset threshold.

[0011] In one embodiment, there are multiple test cycles, and the test points are set up in the same way in each test cycle; accordingly, based on the friction average effective pressure sampling data of multiple test points, a first whole-machine friction work distribution map corresponding to the engine state in the test cycle is determined, including:

[0012] Calculate the average value of the friction mean effective pressure sampling data at each test point;

[0013] The average value of the friction average effective pressure sampling data from multiple test points is interpolated and fitted to obtain the first whole-machine friction work distribution map corresponding to the engine state during the test cycle.

[0014] In one embodiment, based on the performance boundary parameter sampling data from multiple test points, it is determined whether to output a first overall friction work distribution map, including:

[0015] Calculate the average value and standard deviation of the performance boundary parameter sampling data for each test point, and determine the single-test stability level at each test point based on the average value and standard deviation.

[0016] Whether to output the first overall friction work distribution diagram is determined based on the single stability level.

[0017] In one embodiment, there are multiple test cycles, and the test points are set in the same way in each test cycle; accordingly, based on the performance boundary parameter sampling data of multiple test points, it is determined whether to output the first whole machine friction work distribution map, including:

[0018] Calculate the average value of the performance boundary parameter sampling data for each test point within each test cycle;

[0019] Based on the average value of the performance boundary parameter sampling data of each test point in each test cycle, calculate the average value and standard deviation of the performance boundary parameters of each test point in all test cycles.

[0020] Based on the average value and standard deviation of the performance boundary parameters of each test point over all test cycles, determine the multiple stability levels of the test at each test point.

[0021] Whether to output the first overall friction work distribution diagram based on multiple stability levels.

[0022] In one embodiment, the method further includes:

[0023] The engine was disassembled and reassembled to obtain a second overall friction work distribution diagram of the engine after disassembly and reassembly.

[0024] Based on the first and second whole engine friction work distribution diagrams, determine the first whole engine friction work difference distribution diagram.

[0025] Based on the distribution diagram of the friction work difference of the first whole machine, the degree of influence of disassembly and reassembly on the friction work of the engine is determined.

[0026] In one embodiment, the method further includes:

[0027] Replace the target components of the engine and obtain the third overall friction work distribution diagram of the engine after replacing the target components; the components include cylinders, crankshafts, oil pumps or pistons;

[0028] Based on the first and third whole-machine friction work distribution diagrams of the engine, determine the second whole-machine friction work difference distribution diagram of the engine;

[0029] Based on the distribution map of the friction work difference of the second whole machine, the friction work of the target component is determined.

[0030] Secondly, this application also provides an engine friction work testing device. The device includes:

[0031] The data acquisition module is used to start the engine and sample the performance boundary parameters and engine parameters at multiple test points during the test cycle, acquiring the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle; the performance boundary parameters include at least one of humidity, temperature or pressure; the engine parameters include the average effective friction pressure.

[0032] The data processing module is used to determine the first whole-machine friction work distribution map corresponding to the engine state during the test cycle based on the average effective friction pressure sampling data of multiple test points.

[0033] The output judgment module is used to determine whether to output the first whole machine friction work distribution map based on the sampled data of the performance boundary parameters of multiple test points.

[0034] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0035] Start the engine and sample the performance boundary parameters and engine parameters at multiple test points during the test cycle. Obtain the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle. The performance boundary parameters include at least one of humidity, temperature, or pressure. The engine parameters include the average effective friction pressure.

[0036] Based on the sampling data of the average effective friction pressure at multiple test points, the first whole-machine friction work distribution diagram corresponding to the state of the engine during the test cycle is determined.

[0037] Based on the performance boundary parameter sampling data from multiple test points, determine whether to output the first overall friction work distribution diagram.

[0038] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0039] Start the engine and sample the performance boundary parameters and engine parameters at multiple test points during the test cycle. Obtain the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle. The performance boundary parameters include at least one of humidity, temperature, or pressure. The engine parameters include the average effective friction pressure.

[0040] Based on the sampling data of the average effective friction pressure at multiple test points, the first whole-machine friction work distribution diagram corresponding to the state of the engine during the test cycle is determined.

[0041] Based on the performance boundary parameter sampling data from multiple test points, determine whether to output the first overall friction work distribution diagram.

[0042] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0043] Start the engine and sample the performance boundary parameters and engine parameters at multiple test points during the test cycle. Obtain the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle. The performance boundary parameters include at least one of humidity, temperature, or pressure. The engine parameters include the average effective friction pressure.

[0044] Based on the sampling data of the average effective friction pressure at multiple test points, the first whole-machine friction work distribution diagram corresponding to the state of the engine during the test cycle is determined.

[0045] Based on the performance boundary parameter sampling data from multiple test points, determine whether to output the first overall friction work distribution diagram.

[0046] The aforementioned engine friction work testing method, apparatus, computer equipment, storage medium, and computer program product involve starting the engine and sampling performance boundary parameters and engine parameters at multiple test points within a test cycle. This yields performance boundary parameter sampling data and engine parameter sampling data for each test point within the test cycle. Performance boundary parameters include at least one of humidity, temperature, or pressure. Engine parameters include the average effective friction pressure. Based on the average effective friction pressure sampling data from multiple test points, a first overall engine friction work distribution map corresponding to the engine's state within the test cycle is determined. Based on the performance boundary parameter sampling data from multiple test points, it is determined whether to output the first overall engine friction work distribution map. This method tests the friction work of an engine in operation, taking into account the influence of high temperature and high pressure generated by in-cylinder combustion on the working state of various friction pairs and accessories, thus improving the accuracy of friction work testing. Furthermore, it can combine various friction reduction schemes to detect the friction work of the engine under operating conditions after friction reduction, obtaining the true friction reduction effect of each scheme. Attached Figure Description

[0047] Figure 1 This is a diagram illustrating the application environment of an engine friction work testing method in one embodiment.

[0048] Figure 2 This is a schematic diagram of the test bench system for testing engine friction work in one embodiment;

[0049] Figure 3 This is a flowchart illustrating an engine friction work testing method in one embodiment;

[0050] Figure 4 This is a flowchart illustrating the engine friction work testing method in another embodiment;

[0051] Figure 5 This is a flowchart illustrating the engine friction work testing method in yet another embodiment;

[0052] Figure 6 This is a structural block diagram of an engine friction work testing device in one embodiment;

[0053] Figure 7 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0055] The engine friction work testing method provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, terminal 102 collects performance boundary parameters and engine parameters during engine operation. Terminal 102 communicates with server 104 via a network, sending the collected performance boundary parameters and engine parameters to server 104. Server 104 processes the performance boundary parameters and engine parameters to obtain the engine's friction work. A data storage system can store the data that server 104 needs to process. The data storage system can be integrated onto server 104 or located on a cloud or other network server. Server 104 can be implemented using a standalone server or a server cluster consisting of multiple servers.

[0056] The engine friction work testing method provided in this application embodiment can be used in... Figure 2 The test was conducted using the engine friction work test bench system shown. This test bench system includes a test engine 1, an electric dynamometer 2, a combustion analyzer 3, a cylinder pressure sensor 4, an ambient temperature control system 5, an intake control system 6, an air flow meter 7, an independent coolant external circulation system 8, and an independent oil external circulation system 9. The crankshaft of the test engine 1 is connected to the drive shaft of the electric dynamometer 2. The engine oil inlet and outlet are connected to the independent oil external circulation system 8, and the engine coolant inlet and outlet are connected to the independent coolant external circulation system 9.

[0057] Before testing the frictional work of the test engine, pre-test preparations are required, including:

[0058] (1) Preparation of test specimens, including machining of the cylinder head six-cylinder explosion pressure hole, installation of the cylinder head six-cylinder explosion pressure sensor, and machining of special tooling for the cooling and lubrication external circulation system;

[0059] (2) Install the test engine to the test bench. The crankshaft of the test engine is connected to the drive shaft of the electric dynamometer. The engine oil inlet and outlet are connected to the independent oil external circulation system, and the engine coolant inlet and outlet are connected to the independent coolant external circulation system.

[0060] (3) Perform the top dead center position calibration of the first cylinder and calibrate it repeatedly.

[0061] (4) Control and debugging of the engine's independent coolant and oil external circulation system.

[0062] After completing the above-described test engine debugging process, the frictional work of the test engine is tested. In one embodiment, such as... Figure 3 As shown, a method for testing the frictional work of an engine is provided. In this application, the test engine is simply referred to as the engine. This method is applied to... Figure 1Taking server 104 as an example, the following steps are included:

[0063] Step 302: Start the engine. During the test cycle, sample the performance boundary parameters and engine parameters at multiple test points of the engine to obtain the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle. The performance boundary parameters include at least one of humidity, temperature, or pressure. The engine parameters include the average effective friction pressure.

[0064] The engine friction work testing method provided in this application embodiment is performed while the engine is running, that is, testing the friction work of the engine after ignition. Therefore, the engine must be started before data acquisition. Specifically, this can be done by sending a start command to the test bench, which will then start the engine; alternatively, the engine ignition switch can be manually triggered to start the engine.

[0065] Because engines have a long service life, testing the friction work of an engine is generally a complex and lengthy process. Considering the limitations of test conditions, such as the working hours of test personnel, this application divides the entire test process for an engine condition into multiple test cycles. The test process for the engine is consistent within each test cycle, and the selected test points are also the same. Therefore, this application interprets a test cycle as the smallest unit.

[0066] Test points refer to the engine's test operating conditions. During the testing process, the frictional work of the engine needs to be tested under various operating conditions. Therefore, the operating point of each condition is used as a test point, and the frictional work of the engine is tested based on multiple test points. These test points have different speeds and different indicated mean effective pressures (IMEP), for example, (1100, 20) and (800, 10). For each test point, in the experiment, given a fixed IMEP, the engine's brake mean effective pressure (BMEP) is adjusted by adjusting the torque. Then, after the engine parameters stabilize, the friction mean effective pressure (FMEP) is obtained.

[0067] During the testing process, multiple data samples will be taken at each test point, with the sampling time determined based on the rotational speed at each test point. It should be noted that before testing the engine's friction work, the target values ​​of the performance boundary parameters for each test point need to be obtained. During the engine's friction work test, the deviation between the real-time performance boundary parameters and the target values ​​at each test point needs to be controlled within the allowable deviation range to ensure the engine's operating state remains stable.

[0068] Specifically, the target value for each performance boundary parameter can be obtained from the engine's external characteristic data. Each test point may have one or more performance boundary parameters, but the type of performance boundary parameters remains consistent across all test points during a complete friction work test of the engine.

[0069] For each sampling at each test point, a set of data is obtained, including performance boundary parameters and engine parameters. In one embodiment, performance boundary parameters include temperature, humidity, and pressure, while engine parameters include engine speed, torque, IMEP, BMEP, and FMEP. Temperature, humidity, pressure, engine speed, and torque are directly measured on the test bench, while IMEP, BMEP, and FMEP are calculated using directly measured parameters and formulas.

[0070] In one embodiment, there are 9 test points, each sampled 10 times. Testing in a specific order will yield 90 sets of data, each set of data including performance boundary parameters and engine parameters.

[0071] Step 304: Based on the sampling data of the average effective friction pressure at multiple test points, determine the first whole-machine friction work distribution map corresponding to the state of the engine during the test cycle;

[0072] The mean effective pressure refers to the effective work generated per unit cylinder working volume. In this application, the friction mean effective pressure (FMEP) refers to the friction loss of the entire engine, that is, the degree of power loss caused by friction during engine operation.

[0073] Each test point includes FMEP in each sampled data. The FMEP of each test point can only represent the friction work at that test point. By combining the FMEPs of multiple test points, the overall friction work distribution map of the engine can be obtained. Specifically, the multiple FMEP sampled values ​​of each test point can be processed to obtain the representative FMEP value of each test point. Then, the first overall friction work distribution map of the engine can be obtained from the representative FMEP value of each test point.

[0074] Step 306: Based on the performance boundary parameter sampling data of multiple test points, determine whether to output the first whole machine friction work distribution map.

[0075] It should be noted that since each sampling simultaneously acquires performance boundary parameters and engine parameters, and there is a certain correlation between the engine performance boundary parameters and engine parameters, the stability of the engine parameters can be determined by the stability of the performance boundary parameters. Specifically, by analyzing the performance boundary parameter sampling data from multiple test points, the stability of the sampled performance boundary parameters is determined, thereby determining the validity of the first overall engine friction work distribution map.

[0076] In one embodiment, the average value and standard deviation of the sampled data for multiple performance boundary parameters at each test point are calculated, and the stability of the performance boundary parameters is determined by the standard deviation. When each test point has multiple performance boundary parameters, the stability of the multiple performance boundary parameters is considered together to determine the validity of the first overall machine friction work distribution map.

[0077] In addition, by processing and analyzing the performance boundary parameter sampling data, outliers can be identified and the corresponding engine parameters can be deleted, thereby improving the effectiveness of the first whole machine friction work distribution map.

[0078] In the method provided in the above embodiments, the engine is started, and within the test cycle, performance boundary parameters and engine parameters at multiple test points of the engine are sampled to obtain performance boundary parameter sampling data and engine parameter sampling data at each test point within the test cycle. Performance boundary parameters include at least one of humidity, temperature, or pressure; engine parameters include average effective friction pressure. Based on the average effective friction pressure sampling data at multiple test points, a first overall engine friction work distribution map corresponding to the engine's state within the test cycle is determined. Based on the performance boundary parameter sampling data at multiple test points, it is determined whether to output the first overall engine friction work distribution map. This method tests the friction work of an engine in operation, taking into account the influence of high temperature and high pressure generated by in-cylinder combustion on the working state of various friction pairs and accessories of the engine, thus improving the accuracy of friction work testing. Furthermore, it can combine various friction reduction schemes to detect the friction work of the engine in operation after friction reduction, obtaining the true friction reduction effect of each scheme.

[0079] In one embodiment, there are multiple test cycles, and the test points are set up in the same way in each test cycle; accordingly, based on the friction average effective pressure sampling data of multiple test points, a first whole-machine friction work distribution map corresponding to the engine state in the test cycle is determined, including:

[0080] Calculate the average value of the friction mean effective pressure sampling data at each test point;

[0081] The average value of the friction average effective pressure sampling data from multiple test points is interpolated and fitted to obtain the first whole-machine friction work distribution map corresponding to the engine state during the test cycle.

[0082] In each test cycle, the test points are consistent, meaning that tests are conducted over multiple test cycles using fixed operating conditions. Therefore, the average effective friction pressure of the entire engine at each test point is obtained in each test cycle. Then, combining the operating conditions at each test point, the average effective friction pressure of the entire engine over multiple test cycles is interpolated and fitted to obtain the first overall friction work distribution map of the engine. As defined, an operating point refers to any moment within a specific operating range, or a specific moment. Therefore, the location information of each test point on the engine is also the distribution of operating points.

[0083] In the method provided in the above embodiments, by interpolating and fitting the FMAP of each test point, the friction work distribution of the entire engine can be obtained quickly and effectively using only representative test points.

[0084] In one embodiment, such as Figure 4 As shown, based on the performance boundary parameter sampling data from multiple test points, it is determined whether to output the first overall machine friction work distribution diagram, including:

[0085] Step 402: Calculate the average value and standard deviation of the performance boundary parameter sampling data for each test point, and determine the single-test stability level at each test point based on the average value and standard deviation.

[0086] Step 404: Determine whether to output the first whole machine friction work distribution diagram based on the single stability level.

[0087] The standard deviation mentioned in this embodiment refers to the deviation between the average value and the multiple values ​​obtained from sampling the same performance boundary parameter. Therefore, it is necessary to first calculate the average value of the performance boundary parameter sampling data for each test point. For example, in a certain test cycle, for test point A, the rotational speed was sampled 10 times, and the rotational speed data of test point A were obtained [a1, a2, a3, a4, a5, a6, a7, a8, a9, a...]. 10 Then calculate the average value of these 10 rotational speed data. Then based on the average value Calculate [a1, a2, a3, a4, a5, a6, a7, a8, a9, a] 10 The standard deviation is used to reflect the stability of 10 sampling data, that is, to determine the single stability level of the test at each test point. Specifically, the corresponding level can be determined by the range of the standard deviation.

[0088] It should be noted that when there are multiple performance boundary parameters, a standard deviation is calculated for each performance boundary parameter. The single-test stability level at each test point is then determined using the standard deviations of all performance boundary parameters. Specifically, it can be determined based on the maximum standard deviation or the average standard deviation, depending on the stability requirements of the actual application scenario.

[0089] Understandably, a smaller standard deviation indicates a higher single-scale stability level, meaning more accurate data collection and a more accurate first-scale friction work distribution map. Therefore, when determining the single-scale stability level, a preset level can be set to judge the single-scale stability level, thereby determining the accuracy of the output first-scale friction work distribution map. In some embodiments, outliers in the collected performance boundary parameters can also be removed by using the standard deviation to avoid affecting the accuracy of the first-scale friction work distribution map.

[0090] In the method provided in the above embodiments, the stability of the collected performance boundary parameters is determined by the change of performance boundary parameters at each test point in a single test cycle, so as to improve the accuracy of the output first whole machine friction work distribution map.

[0091] In one embodiment, there are multiple test cycles, and the test points are set in the same way in each test cycle; accordingly, based on the performance boundary parameter sampling data of multiple test points, it is determined whether to output the first whole machine friction work distribution map, including:

[0092] Calculate the average value of the performance boundary parameter sampling data for each test point within each test cycle;

[0093] Based on the average value of the performance boundary parameter sampling data of each test point in each test cycle, calculate the average value and standard deviation of the performance boundary parameters of each test point in all test cycles.

[0094] Based on the average value and standard deviation of the performance boundary parameters of each test point over all test cycles, determine the multiple stability levels of the test at each test point.

[0095] Whether to output the first overall friction work distribution diagram based on multiple stability levels.

[0096] For any test point, calculate the average value of the performance boundary parameters corresponding to all preset sampling periods within each test cycle. For example, for test point A, the rotational speed was sampled 10 times in the first test cycle, resulting in the rotational speed data for test point A [a1, a2, a3, a4, a5, a6, a7, a8, a9, a...]. 10 Then calculate the average value of these 10 rotational speed data. This represents the rotational speed of test point A in the first test cycle. Similarly, the average value of the performance boundary parameters of test point A is calculated across all test cycles. The stability of the test data acquired multiple times at any test point is determined by the standard deviation of all average values.

[0097] The stability level is determined by testing at multiple points using the standard deviation. It's understood that in this example, a smaller standard deviation results in a higher stability level, indicating more stable engine operation throughout the testing process, more accurate data collection, and a more accurate first overall engine friction work distribution map. Therefore, determining the multiple stability level can be done by setting a preset level to assess the accuracy of the output first overall engine friction work distribution map. In some embodiments, outliers in the collected performance boundary parameters can be removed using the standard deviation to avoid affecting the accuracy of the first overall engine friction work distribution map.

[0098] It is understood that the calculation process of the standard deviation in this embodiment is different from that in the above embodiments, so the meanings are also different, and the corresponding preset levels are also different.

[0099] In the method provided in the above embodiments, the stability of the collected performance boundary parameters is determined by the changes in the performance boundary parameters at each test point in multiple test cycles, so as to improve the accuracy of the output first whole machine friction work distribution map.

[0100] In one embodiment, such as Figure 5 As shown, the method also includes:

[0101] Step 502: Disassemble and reassemble the engine to obtain the second whole-machine friction work distribution diagram of the disassembled and reassembled engine;

[0102] Step 504: Determine the first overall friction work difference distribution map of the engine based on the first overall friction work distribution map and the second overall friction work distribution map of the engine.

[0103] Step 506: Based on the first whole machine friction work difference distribution map, determine the degree of influence of disassembly and reassembly on the friction work of the engine.

[0104] After completing the friction work test on the original engine, the component damage test requires disassembling and reassembling the original engine. A friction work test is then performed on the reassembled engine to obtain a second overall engine friction work distribution diagram. By analyzing the difference between the second and first overall engine friction work distribution diagrams, the degree of impact of disassembly and reassembly on the engine's friction work can be determined.

[0105] The method provided in the above embodiments can identify the impact of the high temperature and high pressure generated by combustion in the engine cylinder on the working state of various friction pairs and accessories of the engine, making the test closer to the actual friction level and improving the accuracy of engine friction work testing.

[0106] In one embodiment, the method further includes:

[0107] Replace the target components of the engine and obtain the third overall friction work distribution diagram of the engine after replacing the target components; the components include cylinders, crankshafts, oil pumps or pistons;

[0108] Based on the first and third whole-machine friction work distribution diagrams of the engine, determine the second whole-machine friction work difference distribution diagram of the engine;

[0109] Based on the distribution map of the friction work difference of the second whole machine, the friction work of the target component is determined.

[0110] The process involves replacing target engine components to implement different friction reduction schemes. A third overall engine friction work distribution map is obtained after the replacement of the target components. By analyzing the difference in overall engine friction work between the third and first overall engine friction work distribution maps, and combining this with data on cycle thermal efficiency, cycle work, and specific fuel consumption at test operating points, the friction reduction effect of different schemes is determined. For example, if the friction work at the test point determined by the third overall engine friction work difference is less than that determined by the first overall engine friction work difference, then the replaced cylinder can effectively reduce the engine's friction work.

[0111] The method provided in the above embodiments compares the test results of the original engine with the test results after replacing the target parts, and compares the actual effects of different friction reduction schemes to determine the friction work and fuel consumption levels of different engines. This has important guiding significance for the forward development and design process of actual engines.

[0112] In one embodiment, the friction average effective pressure sampling data of each test point over one or more test cycles can be processed to calculate the average value and standard deviation in order to determine the effectiveness of the sampled FMEP.

[0113] In one embodiment, the test cycle is set to one day, and the engine has nine test points. The daily test procedure includes:

[0114] (1) Nine test points are tested in a specific order, with 10 tests at each test point, and a total of 90 sets of data are collected per day. Each set of data includes performance boundary parameters (temperature, humidity, pressure, etc.) and engine parameters (speed, torque, IMEP, BMEP, FMEP, etc.).

[0115] (2) The average value and standard deviation of the performance boundary parameters in the 10 sets of data for each test point are calculated to evaluate the stability of the performance boundary parameters in 10 samplings at a single point;

[0116] (3) The average value and standard deviation of FMEP in 10 sets of data at each test point were calculated to evaluate the repeatability of FMEP (friction work) in 10 samplings at each point on a single day;

[0117] (4) The average value of FMEP from 10 samplings at each point is used to represent itself. The total friction work MAP (daily) of the engine under this state is fitted by FMEP interpolation at 9 points.

[0118] For the above process, if the test cycle for the same state of the engine includes multiple cycles, i.e., multi-day testing, then the data analysis process includes:

[0119] (1) Repeat the daily testing process for each test point, generally for at least three days in the same state;

[0120] (2) Based on the self-written script, the standard deviation of each performance boundary parameter (average of 10 samplings) at each point over three days is calculated to evaluate the stability of each performance boundary at a single point over three days.

[0121] (3) The standard deviation of the FMEP values ​​(average of 10 samplings) at each point over three days was calculated to evaluate the reproducibility of FMEP (friction work) in the three-day test at each point;

[0122] (4) The average of the FMEP values ​​of each point over three days is used to represent itself. The FMEP interpolation of the nine test points is used to fit the engine friction work MAP (three days) under this condition.

[0123] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0124] Based on the same inventive concept, this application also provides an engine friction work testing device for implementing the engine friction work testing method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations of one or more engine friction work testing device embodiments provided below can be found in the limitations of the engine friction work testing method described above, and will not be repeated here.

[0125] In one embodiment, such as Figure 6 As shown, an engine friction work testing device is provided, including: a data acquisition module 601, a data processing module 602, and an output judgment module 603, wherein:

[0126] The data acquisition module 601 is used to start the engine and sample the performance boundary parameters and engine parameters at multiple test points of the engine during the test cycle, and acquire the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle; the performance boundary parameters include at least one of humidity, temperature or pressure; the engine parameters include the average effective friction pressure.

[0127] Data processing module 602 is used to determine the first whole-machine friction work distribution map corresponding to the state of the engine during the test cycle based on the average effective friction pressure sampling data of multiple test points.

[0128] The output judgment module 603 is used to determine whether to output the first whole machine friction work distribution map based on the sampled data of the performance boundary parameters of multiple test points.

[0129] In one embodiment, the engine friction work testing device further includes a control value module for:

[0130] Obtain the target value of the performance boundary parameter and control the difference between the engine's performance boundary parameter and the target value to be less than a preset threshold.

[0131] In one embodiment, the data processing module 602 is further configured to:

[0132] Calculate the average value of the friction mean effective pressure sampling data at each test point;

[0133] The average value of the friction average effective pressure sampling data from multiple test points is interpolated and fitted to obtain the first whole-machine friction work distribution map corresponding to the engine state during the test cycle.

[0134] In one embodiment, the output judgment module 603 is further configured to:

[0135] Calculate the average value and standard deviation of the performance boundary parameter sampling data for each test point, and determine the single-test stability level at each test point based on the average value and standard deviation.

[0136] Whether to output the first overall friction work distribution diagram is determined based on the single stability level.

[0137] In one embodiment, the output judgment module 603 is further configured to:

[0138] Calculate the average value of the performance boundary parameter sampling data for each test point within each test cycle;

[0139] Based on the average value of the performance boundary parameter sampling data of each test point in each test cycle, calculate the average value and standard deviation of the performance boundary parameters of each test point in all test cycles.

[0140] Based on the average value and standard deviation of the performance boundary parameters of each test point over all test cycles, determine the multiple stability levels of the test at each test point.

[0141] Whether to output the first overall friction work distribution diagram based on multiple stability levels.

[0142] In one embodiment, the data processing module 602 is further configured to:

[0143] The engine was disassembled and reassembled to obtain a second overall friction work distribution diagram of the engine after disassembly and reassembly.

[0144] Based on the first and second whole engine friction work distribution diagrams, determine the first whole engine friction work difference distribution diagram.

[0145] Based on the distribution diagram of the friction work difference of the first whole machine, the degree of influence of disassembly and reassembly on the friction work of the engine is determined.

[0146] In one embodiment, the data processing module 602 is further configured to:

[0147] Replace the target components of the engine and obtain the third overall friction work distribution diagram of the engine after replacing the target components; the components include cylinders, crankshafts, oil pumps or pistons;

[0148] Based on the first and third whole-machine friction work distribution diagrams of the engine, determine the second whole-machine friction work difference distribution diagram of the engine;

[0149] Based on the distribution map of the friction work difference of the second whole machine, the friction work of the target component is determined.

[0150] Each module in the aforementioned engine friction work testing device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0151] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 7 As shown, the computer device includes a processor, memory, and a network interface connected via a system bus. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database stores performance boundary parameter data. The network interface communicates with external terminals via a network connection. When executed by the processor, the computer program implements a method for testing engine friction work.

[0152] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0153] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0154] Start the engine and sample the performance boundary parameters and engine parameters at multiple test points during the test cycle. Obtain the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle. The performance boundary parameters include at least one of humidity, temperature, or pressure. The engine parameters include the average effective friction pressure.

[0155] Based on the sampling data of the average effective friction pressure at multiple test points, the first whole-machine friction work distribution diagram corresponding to the state of the engine during the test cycle is determined.

[0156] Based on the performance boundary parameter sampling data from multiple test points, determine whether to output the first overall friction work distribution diagram.

[0157] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0158] Obtain the target value of the performance boundary parameter and control the difference between the engine's performance boundary parameter and the target value to be less than a preset threshold.

[0159] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0160] Calculate the average value of the friction mean effective pressure sampling data at each test point;

[0161] The average value of the friction average effective pressure sampling data from multiple test points is interpolated and fitted to obtain the first whole-machine friction work distribution map corresponding to the engine state during the test cycle.

[0162] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0163] Calculate the average value and standard deviation of the performance boundary parameter sampling data for each test point, and determine the single-test stability level at each test point based on the average value and standard deviation.

[0164] Whether to output the first overall friction work distribution diagram is determined based on the single stability level.

[0165] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0166] Calculate the average value of the performance boundary parameter sampling data for each test point within each test cycle;

[0167] Based on the average value of the performance boundary parameter sampling data of each test point in each test cycle, calculate the average value and standard deviation of the performance boundary parameters of each test point in all test cycles.

[0168] Based on the average value and standard deviation of the performance boundary parameters of each test point over all test cycles, determine the multiple stability levels of the test at each test point.

[0169] Whether to output the first overall friction work distribution diagram based on multiple stability levels.

[0170] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0171] The engine was disassembled and reassembled to obtain a second overall friction work distribution diagram of the engine after disassembly and reassembly.

[0172] Based on the first and second whole engine friction work distribution diagrams, determine the first whole engine friction work difference distribution diagram.

[0173] Based on the distribution diagram of the friction work difference of the first whole machine, the degree of influence of disassembly and reassembly on the friction work of the engine is determined.

[0174] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0175] Replace the target components of the engine and obtain the third overall friction work distribution diagram of the engine after replacing the target components; the components include cylinders, crankshafts, oil pumps or pistons;

[0176] Based on the first and third whole-machine friction work distribution diagrams of the engine, determine the second whole-machine friction work difference distribution diagram of the engine;

[0177] Based on the distribution map of the friction work difference of the second whole machine, the friction work of the target component is determined.

[0178] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0179] Start the engine and sample the performance boundary parameters and engine parameters at multiple test points during the test cycle. Obtain the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle. The performance boundary parameters include at least one of humidity, temperature, or pressure. The engine parameters include the average effective friction pressure.

[0180] Based on the sampling data of the average effective friction pressure at multiple test points, the first whole-machine friction work distribution diagram corresponding to the state of the engine during the test cycle is determined.

[0181] Based on the performance boundary parameter sampling data from multiple test points, determine whether to output the first overall friction work distribution diagram.

[0182] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0183] Obtain the target value of the performance boundary parameter and control the difference between the engine's performance boundary parameter and the target value to be less than a preset threshold.

[0184] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0185] Calculate the average value of the friction mean effective pressure sampling data at each test point;

[0186] The average value of the friction average effective pressure sampling data from multiple test points is interpolated and fitted to obtain the first whole-machine friction work distribution map corresponding to the engine state during the test cycle.

[0187] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0188] Calculate the average value and standard deviation of the performance boundary parameter sampling data for each test point, and determine the single-test stability level at each test point based on the average value and standard deviation.

[0189] Whether to output the first overall friction work distribution diagram is determined based on the single stability level.

[0190] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0191] Calculate the average value of the performance boundary parameter sampling data for each test point within each test cycle;

[0192] Based on the average value of the performance boundary parameter sampling data of each test point in each test cycle, calculate the average value and standard deviation of the performance boundary parameters of each test point in all test cycles.

[0193] Based on the average value and standard deviation of the performance boundary parameters of each test point over all test cycles, determine the multiple stability levels of the test at each test point.

[0194] Whether to output the first overall friction work distribution diagram based on multiple stability levels.

[0195] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0196] The engine was disassembled and reassembled to obtain a second overall friction work distribution diagram of the engine after disassembly and reassembly.

[0197] Based on the first and second whole engine friction work distribution diagrams, determine the first whole engine friction work difference distribution diagram.

[0198] Based on the distribution diagram of the friction work difference of the first whole machine, the degree of influence of disassembly and reassembly on the friction work of the engine is determined.

[0199] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0200] Replace the target components of the engine and obtain the third overall friction work distribution diagram of the engine after replacing the target components; the components include cylinders, crankshafts, oil pumps or pistons;

[0201] Based on the first and third whole-machine friction work distribution diagrams of the engine, determine the second whole-machine friction work difference distribution diagram of the engine;

[0202] Based on the distribution map of the friction work difference of the second whole machine, the friction work of the target component is determined.

[0203] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0204] Start the engine and sample the performance boundary parameters and engine parameters at multiple test points during the test cycle. Obtain the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle. The performance boundary parameters include at least one of humidity, temperature, or pressure. The engine parameters include the average effective friction pressure.

[0205] Based on the sampling data of the average effective friction pressure at multiple test points, the first whole-machine friction work distribution diagram corresponding to the state of the engine during the test cycle is determined.

[0206] Based on the performance boundary parameter sampling data from multiple test points, determine whether to output the first overall friction work distribution diagram.

[0207] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0208] Obtain the target value of the performance boundary parameter and control the difference between the engine's performance boundary parameter and the target value to be less than a preset threshold.

[0209] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0210] Calculate the average value of the friction mean effective pressure sampling data at each test point;

[0211] The average value of the friction average effective pressure sampling data from multiple test points is interpolated and fitted to obtain the first whole-machine friction work distribution map corresponding to the engine state during the test cycle.

[0212] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0213] Calculate the average value and standard deviation of the performance boundary parameter sampling data for each test point, and determine the single-test stability level at each test point based on the average value and standard deviation.

[0214] Whether to output the first overall friction work distribution diagram is determined based on the single stability level.

[0215] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0216] Calculate the average value of the performance boundary parameter sampling data for each test point within each test cycle;

[0217] Based on the average value of the performance boundary parameter sampling data of each test point in each test cycle, calculate the average value and standard deviation of the performance boundary parameters of each test point in all test cycles.

[0218] Based on the average value and standard deviation of the performance boundary parameters of each test point over all test cycles, determine the multiple stability levels of the test at each test point.

[0219] Whether to output the first overall friction work distribution diagram based on multiple stability levels.

[0220] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0221] The engine was disassembled and reassembled to obtain a second overall friction work distribution diagram of the engine after disassembly and reassembly.

[0222] Based on the first and second whole engine friction work distribution diagrams, determine the first whole engine friction work difference distribution diagram.

[0223] Based on the distribution diagram of the friction work difference of the first whole machine, the degree of influence of disassembly and reassembly on the friction work of the engine is determined.

[0224] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0225] Replace the target components of the engine and obtain the third overall friction work distribution diagram of the engine after replacing the target components; the components include cylinders, crankshafts, oil pumps or pistons;

[0226] Based on the first and third whole-machine friction work distribution diagrams of the engine, determine the second whole-machine friction work difference distribution diagram of the engine;

[0227] Based on the distribution map of the friction work difference of the second whole machine, the friction work of the target component is determined.

[0228] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0229] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0230] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for testing the frictional work of an engine, characterized in that, The method includes: The engine is started, and within the test cycle, the performance boundary parameters and engine parameters of the engine at multiple test points are sampled to obtain the performance boundary parameter sampling data and engine parameter sampling data for each test point within the test cycle; the performance boundary parameters include at least one of humidity, temperature, or pressure; the engine parameters include the average effective friction pressure. Based on the average effective friction pressure sampling data from multiple test points, a first whole-machine friction work distribution diagram corresponding to the state of the engine within the test cycle is determined. Based on the performance boundary parameter sampling data of multiple test points, determine whether to output the first whole machine friction work distribution map; The number of test cycles is multiple, and the test points are set in the same way in each test cycle; correspondingly, the step of determining whether to output the first whole machine friction work distribution map based on the performance boundary parameter sampling data of multiple test points includes: Calculate the average value of the performance boundary parameter sampling data for each test point within each test cycle; Based on the average value of the performance boundary parameter sampling data of each test point in each test cycle, calculate the average value and standard deviation of the performance boundary parameters of each test point in all test cycles. Based on the average value and standard deviation of the performance boundary parameters of each test point over all test cycles, determine the multiple stability levels of the test at each test point. Based on the multiple stability levels, determine whether to output the first whole machine friction work distribution diagram.

2. The method according to claim 1, characterized in that, The method further includes: Obtain the target value of the performance boundary parameter, and control the difference between the engine's performance boundary parameter and the target value to be less than a preset threshold.

3. The method according to claim 1, characterized in that, The number of test cycles is multiple, and the test points are set up in the same way in each test cycle; correspondingly, determining the first whole-machine friction work distribution map corresponding to the state of the engine in the test cycle based on the friction average effective pressure sampling data of multiple test points includes: Calculate the average value of the friction mean effective pressure sampling data at each test point; The average value of the friction average effective pressure sampling data from multiple test points is interpolated and fitted to obtain the first whole-machine friction work distribution map corresponding to the state of the engine during the test cycle.

4. The method according to claim 3, characterized in that, The method further includes: The engine was disassembled and reassembled to obtain a second overall friction work distribution diagram of the disassembled and reassembled engine; Based on the first overall friction work distribution diagram and the second overall friction work distribution diagram of the engine, determine the first overall friction work difference distribution diagram of the engine; Based on the first whole machine friction work difference distribution map, the degree of influence of disassembly and reassembly on the friction work of the engine is determined.

5. The method according to claim 3, characterized in that, The method further includes: Replace the target components of the engine and obtain a third overall friction work distribution diagram of the engine after replacing the target components; the components include cylinders, crankshafts, oil pumps, or pistons; Based on the first and third whole-machine friction work distribution diagrams of the engine, the second whole-machine friction work difference distribution diagram of the engine is determined. Based on the second whole machine friction work difference distribution map, the friction work of the target component is determined.

6. An engine friction work testing device, characterized in that, The device includes: The data acquisition module is used to start the engine and sample the performance boundary parameters and engine parameters at multiple test points of the engine during the test cycle, acquiring the performance boundary parameter sampling data and engine parameter sampling data at each test point during the test cycle; the performance boundary parameters include at least one of humidity, temperature, or pressure; the engine parameters include the average effective friction pressure. The data processing module is used to determine the first whole-machine friction work distribution map corresponding to the state of the engine within the test cycle based on the average effective friction pressure sampling data of multiple test points. The output judgment module is used to determine whether to output the first whole machine friction work distribution map based on the sampled data of the performance boundary parameters of multiple test points. The number of test cycles is multiple, and the test points are set up in the same way in each test cycle. The output judgment module is also used to: calculate the average value of the performance boundary parameter sampling data of each test point in each test cycle; calculate the average value and standard deviation of the performance boundary parameters of each test point in all test cycles based on the average value of the performance boundary parameter sampling data of each test point in each test cycle; determine the multiple stability level of the test at each test point based on the average value and standard deviation of the performance boundary parameters of each test point in all test cycles; and determine whether to output the first whole machine friction work distribution map based on the multiple stability level.

7. The apparatus according to claim 6, characterized in that, The device further includes a control value module, the control value module being used for: Obtain the target value of the performance boundary parameter, and control the difference between the engine's performance boundary parameter and the target value to be less than a preset threshold.

8. The apparatus according to claim 6, characterized in that, The data processing module is also used for: Calculate the average value of the friction mean effective pressure sampling data at each test point; The average value of the friction average effective pressure sampling data from multiple test points is interpolated and fitted to obtain the first whole-machine friction work distribution map corresponding to the state of the engine during the test cycle.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 5.

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