Engine VVT calibration methods, devices, equipment and storage media
By constructing an engine performance analysis model and conducting simulations, the optimal intake and exhaust valve openings are obtained, solving the problem of excessively long calibration time in traditional VVT and achieving a highly efficient calibration process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-11-10
- Publication Date
- 2026-03-10
AI Technical Summary
Traditional gasoline engine VVT calibration methods require a lot of time and cost, as they need to collect data points at every speed-load condition, resulting in excessively long calibration times.
By constructing an engine performance analysis model, inputting preset intake and exhaust valve openings for simulation, fuel consumption rate, torque, and exhaust temperature parameters are obtained. Based on these parameters, VVT calibration is performed, and the optimal opening is selected for calibration.
It effectively shortens VVT calibration time, improves calibration efficiency, and reduces the number of tests and costs.
Smart Images
Figure CN115688458B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of engine, and particularly relates to an engine VVT calibration method, device, equipment and storage medium. BACKGROUND
[0002] In order to meet the increasingly stringent fuel consumption and emission regulations and improve the power of the engine, the variable valve (VVT) technology has become a basic configuration of the gasoline engine. The traditional gasoline engine VVT calibration scheme needs to consume a large amount of test time and test cost, needs to collect points under each "speed-load" condition, and needs to arrange and combine the intake valve opening degree from 0 to 50 degrees and the exhaust valve opening degree from 0 to -50 degrees, so as to collect 36 groups of data. The formed arrangement and combination working time period is very long. Therefore, how to effectively shorten the engine VVT calibration time becomes a problem to be solved.
[0003] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY
[0004] The main purpose of the present application is to provide an engine VVT calibration method, device, equipment and storage medium, which aims to solve the technical problem of how to effectively shorten the engine VVT calibration time.
[0005] In order to achieve the above-mentioned purpose, the present application provides an engine VVT calibration method, which comprises the following steps:
[0006] constructing an engine performance analysis model according to the performance parameters corresponding to the engine assembly;
[0007] inputting a preset intake valve opening degree and a preset exhaust valve opening degree into the engine performance analysis model for simulation to obtain output parameters, the output parameters comprising engine fuel consumption rate, engine torque and engine exhaust temperature;
[0008] calibrating the engine VVT according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature.
[0009] Optionally, the step of inputting the preset intake valve opening degree and the preset exhaust valve opening degree into the engine performance analysis model for simulation to obtain the output parameters specifically comprises:
[0010] acquiring a preset ignition angle, a preset throttle opening degree, a preset turbo pressure relief valve diameter and a preset engine speed;
[0011] calling the engine performance analysis model through an engine bench model in a preset simulation software.
[0012] The preset intake valve opening, the preset exhaust valve opening, the preset ignition angle, the preset throttle opening, the preset turbo pressure relief valve diameter and the preset engine speed are input to the engine performance analysis model for simulation to obtain an output parameter.
[0013] Optionally, the step of calibrating the engine VVT according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature specifically comprises:
[0014] optimal engine fuel consumption rate, optimal engine torque and optimal engine exhaust temperature are selected from the engine fuel consumption rate, the engine torque and the engine exhaust temperature;
[0015] optimal intake valve opening and optimal exhaust valve opening corresponding to the optimal engine fuel consumption rate, the optimal engine torque and the optimal engine exhaust temperature are obtained;
[0016] An engine VVT calibration result is determined according to the optimal intake valve opening and the optimal exhaust valve opening.
[0017] Optionally, the step of selecting optimal engine fuel consumption rate, optimal engine torque and optimal engine exhaust temperature from the engine fuel consumption rate, the engine torque and the engine exhaust temperature specifically comprises:
[0018] When the engine torque reaches a preset value, a target engine exhaust temperature corresponding thereto is obtained;
[0019] A target engine fuel consumption rate corresponding to the target engine exhaust temperature within a preset temperature range is obtained;
[0020] The minimum value of the target engine fuel consumption rate is taken as the optimal engine fuel consumption rate, and the optimal engine torque and the optimal engine exhaust temperature corresponding to the optimal engine fuel consumption rate are obtained.
[0021] Optionally, after the step of calibrating the engine VVT according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature, the method further comprises:
[0022] A bench test is performed according to the optimal intake valve opening and the optimal exhaust valve opening to obtain a test result, the test result comprising a test fuel consumption rate, a test torque and a test exhaust temperature;
[0023] The test fuel consumption rate, the test torque and the test exhaust temperature are compared with a target result, and the engine VVT calibration result is verified according to the comparison result.
[0024] Optionally, the step of performing bench test according to the optimal intake valve opening and the optimal exhaust valve opening to obtain a test result, specifically comprises:
[0025] When the to-be-tested engine meets preset general conditions, warming up the to-be-tested engine according to a preset engine water temperature and a preset oil temperature;
[0026] After the to-be-tested engine is warmed up, and when the to-be-tested engine meets preset test boundary conditions, inputting the optimal intake valve opening and the optimal exhaust valve opening into an engine controller corresponding to the to-be-tested engine to perform test, and obtaining a test result.
[0027] Optionally, the step of constructing an engine performance analysis model according to performance parameters corresponding to an engine assembly, specifically comprises:
[0028] Obtaining a basic structure of the engine assembly, the basic structure comprising: an intake system, a supercharger, an intercooler, an intake manifold, an intake valve, a cylinder, a combustion model, a heat dissipation model, an exhaust valve, an exhaust manifold and an exhaust system;
[0029] Constructing an engine performance analysis model according to performance parameters corresponding to the intake system, the supercharger, the intercooler, the intake manifold, the intake valve, the cylinder, the combustion model, the heat dissipation model, the exhaust valve, the exhaust manifold and the exhaust system.
[0030] In addition, to achieve the above object, the application further provides an engine VVT calibration device, which comprises:
[0031] A model construction module, configured to construct an engine performance analysis model according to performance parameters corresponding to an engine assembly;
[0032] A model simulation module, configured to input a preset intake valve opening and a preset exhaust valve opening into the engine performance analysis model to perform simulation, and obtain output parameters, the output parameters comprising an engine fuel consumption rate, an engine torque and an engine exhaust temperature;
[0033] An engine VVT calibration module, configured to perform engine VVT calibration according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature.
[0034] In addition, to achieve the above object, the present application also provides an engine VVT calibration device, comprising a memory, a processor and an engine VVT calibration program stored in the memory and executable on the processor, the engine VVT calibration program being configured to implement the steps of the engine VVT calibration method as described above.
[0035] In addition, to achieve the above object, the present application also provides a storage medium having an engine VVT calibration program stored thereon, the engine VVT calibration program being executable by a processor to implement the steps of the engine VVT calibration method as described above.
[0036] The present application constructs an engine performance analysis model according to the corresponding performance parameters of the engine assembly, then inputs the preset intake valve opening and the preset exhaust valve opening into the engine performance analysis model for simulation to obtain output parameters, including engine fuel consumption rate, engine torque and engine exhaust temperature, and then performs engine VVT calibration according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature. The present application inputs the preset intake valve opening and the preset exhaust valve opening into the engine performance analysis model for simulation to obtain output parameters, which can obtain the output parameters corresponding to different intake valve openings and different exhaust valve openings, and then perform engine VVT calibration according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature, which can determine the optimal intake valve opening and the optimal exhaust valve opening according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature. Compared with the existing need to collect multiple sets of data at each operating point, the present application can effectively shorten the engine VVT calibration time and improve the engine VVT calibration efficiency by inputting the preset intake valve opening and the preset exhaust valve opening into the engine performance analysis model for simulation. BRIEF DESCRIPTION OF DRAWINGS
[0037] Figure 1 is a structural schematic diagram of an engine VVT calibration device of a hardware running environment involved in the embodiment scheme of the present application;
[0038] Figure 2 is a flowchart of the first embodiment of the engine VVT calibration method of the present application;
[0039] Figure 3 is a flowchart of the second embodiment of the engine VVT calibration method of the present application;
[0040] Figure 4 is a flowchart of the third embodiment of the engine VVT calibration method of the present application;
[0041] Figure 5 is a structural block diagram of the first embodiment of the engine VVT calibration device of the present application.
[0042] The objectives, functional characteristics and advantages of the present application will be further illustrated in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0043] It should be understood that the specific embodiments described herein merely exemplify the application and do not limit the application.
[0044] Reference Figure 1 , Figure 1 The engine VVT calibration device structure diagram of the hardware running environment involved in the embodiment of the present application is shown.
[0045] As Figure 1 shown, the engine VVT calibration device can include a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize the connection and communication between the components. The user interface 1003 can include a display screen, an input unit such as a keyboard, and can also include a standard wired interface, a wireless interface. The network interface 1004 can optionally include a standard wired interface, a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 can be a high-speed random access memory (RAM), and can also be a stable non-volatile memory (NVM), such as a disk memory. The memory 1005 can also be a storage device independent of the aforementioned processor 1001.
[0046] Those skilled in the art can understand that Figure 1 the structure shown in the figure does not constitute a limitation on the engine VVT calibration device, and can include more or fewer components than the figure, or combine certain components, or different component arrangements.
[0047] As Figure 1 shown, the memory 1005 as a storage medium can include an operating system, a network communication module, a user interface module, and an engine VVT calibration program.
[0048] In Figure 1The network interface 1004 is mainly used for data communication with the network server, and the user interface 1003 is mainly used for data interaction with the user. The processor 1001 and the memory 1005 in the engine VVT calibration device can be arranged in the engine VVT calibration device. The engine VVT calibration device calls the engine VVT calibration program stored in the memory 1005 through the processor 1001, and executes the engine VVT calibration method provided in the embodiment of the application.
[0049] Based on the engine VVT calibration device, the embodiment of the application provides an engine VVT calibration method, which refers to Figure 2 , Figure 2 The flowchart of the first embodiment of the engine VVT calibration method of the application is shown in the figure.
[0050] In this embodiment, the engine VVT calibration method comprises the following steps:
[0051] Step S10: constructing an engine performance analysis model according to the performance parameters corresponding to the engine assembly;
[0052] It should be noted that the execution subject of the embodiment can be a computing service device with data processing, network communication and program running functions, such as a mobile phone, a tablet computer, a personal computer, etc., or an electronic device or an engine VVT calibration device capable of realizing the above functions. The engine VVT calibration device is taken as an example to describe the embodiment and the following embodiments.
[0053] It can be understood that the engine assembly, also known as the engine, is a machine that can convert one form of energy into another more useful energy, usually converting chemical energy into mechanical energy. It is suitable for power generation device, and can also refer to the entire machine including the power device. The engine assembly includes the entire engine and its accessories.
[0054] It should be understood that the performance parameters refer to the parameters corresponding to various structures of the engine assembly, such as pressure, torque, etc. The engine performance analysis model refers to a model for analyzing the performance of the engine. The embodiment can analyze the parameters input into the engine performance analysis model and output the analyzed parameters.
[0055] Further, in order to accurately construct the engine performance analysis model, in the embodiment, the step S10 comprises: obtaining the basic structure of the engine assembly, the basic structure comprising: an intake system, a supercharger, an intercooler, an intake manifold, an intake valve, a cylinder, a combustion model, a heat dissipation model, an exhaust valve, an exhaust manifold and an exhaust system; constructing the engine performance analysis model according to the performance parameters corresponding to the intake system, the supercharger, the intercooler, the intake manifold, the intake valve, the cylinder, the combustion model, the heat dissipation model, the exhaust valve, the exhaust manifold and the exhaust system.
[0056] It can be understood that the basic structure of the engine assembly in the embodiment can comprise the intake system, the supercharger, the intercooler, the intake manifold, the intake valve, the cylinder, the combustion model, the heat dissipation model, the exhaust valve, the exhaust manifold and the exhaust system, and can also comprise other structures, which are not specifically limited in the embodiment.
[0057] It should be understood that the performance parameters corresponding to the intake system, the supercharger, the intercooler, the intake manifold, the intake valve, the cylinder, the combustion model, the heat dissipation model, the exhaust valve, the exhaust manifold and the exhaust system can be obtained, for example, the performance parameters corresponding to the supercharger can comprise a pressure ratio (a ratio of the outlet pressure of the supercharger to the inlet pressure of the supercharger), an intake flow (a weight of gas flowing through the supercharger per unit time), a total efficiency of the supercharger (a ratio of the output energy of the supercharger to the input energy), etc., the performance parameters corresponding to the intercooler can comprise a heat dissipation power, a diameter, etc., and the performance parameters corresponding to other structures are not excessively described in the embodiment, and can be parameters required to be set for each structure in actual life.
[0058] In a specific implementation, the engine performance analysis model can be constructed according to the performance parameters corresponding to the intake system, the supercharger, the intercooler, the intake manifold, the intake valve, the cylinder, the combustion model, the heat dissipation model, the exhaust valve, the exhaust manifold and the exhaust system, and the engine performance analysis model can comprise the basic structure of the engine assembly and the corresponding performance parameters.
[0059] Step S20: inputting a preset intake valve opening degree and a preset exhaust valve opening degree into the engine performance analysis model for simulation to obtain output parameters, the output parameters comprising an engine fuel consumption rate, an engine torque and an engine exhaust temperature;
[0060] It should be noted that the preset intake valve opening degree refers to a pre-set intake valve opening degree, and the preset exhaust valve opening degree refers to a pre-set exhaust valve opening degree, and the preset intake valve opening degree and the preset exhaust valve opening degree can comprise multiple values, for example, the preset intake valve opening degree can be set to -5°, -14°, -12°, -8°, etc., and the preset exhaust valve opening degree can be set to 5°, 14°, 12°, 10°, etc.
[0061] It can be understood that after the preset intake valve opening and the preset exhaust valve opening are input into the engine performance analysis model for simulation, an output parameter can be obtained, the output parameter refers to a parameter output by the engine performance analysis model, and the output parameter in the embodiment can include an engine fuel consumption rate, an engine torque and an engine exhaust temperature. The engine fuel consumption rate, the engine torque and the engine exhaust temperature in the output parameter are different when the preset intake valve opening and the preset exhaust valve opening input into the engine performance analysis model are different. The embodiment can obtain the corresponding relationship among the preset intake valve opening, the preset exhaust valve opening, the engine fuel consumption rate, the engine torque and the engine exhaust temperature.
[0062] Further, in order to accurately determine the output parameter, in the embodiment, the step S20 comprises: obtaining a preset ignition angle, a preset throttle opening, a preset turbo pressure relief valve diameter and a preset engine speed; calling the engine performance analysis model through an engine bench model in a preset simulation software; inputting the preset intake valve opening, the preset exhaust valve opening, the preset ignition angle, the preset throttle opening, the preset turbo pressure relief valve diameter and the preset engine speed into the engine performance analysis model for simulation to obtain the output parameter.
[0063] It should be noted that the preset ignition angle refers to a preset ignition angle, the preset throttle opening refers to a preset throttle opening, the preset turbo pressure relief valve diameter refers to a preset turbo pressure relief valve diameter, and the preset engine speed refers to a preset engine speed. The preset ignition angle, the preset throttle opening, the preset turbo pressure relief valve diameter and the preset engine speed can include multiple values, for example: the preset ignition angle can be set to -2°, -9°, -10° and -8°, the preset throttle opening can be set to 90°, the preset turbo pressure relief valve diameter can be set to 80 mm, and the preset engine speed can be set to 1000 RPM, 1200 RPM, 1400 RPM and 1500 RPM.
[0064] It can be understood that the preset simulation software refers to a preset simulation software, and the preset simulation software in the embodiment can be matlab software. The engine performance analysis model can be called through an engine bench model in the matlab software, and then the preset intake valve opening, the preset exhaust valve opening, the preset ignition angle, the preset throttle opening, the preset turbo pressure relief valve diameter and the preset engine speed are input into the engine performance analysis model for simulation to obtain the output parameter.
[0065] In a specific implementation, the script in the matlab software can be:
[0066]
[0067]
[0068]
[0069] Specifically, in the above script code, the "input.xlsx" can contain the preset intake valve opening degree, the preset exhaust valve opening degree, the preset ignition angle, the preset throttle opening degree, the preset turbo relief valve diameter and the preset engine speed. RPM represents the preset engine speed, throtang represents the preset throttle opening degree, HD represents the preset turbo relief valve diameter, Inj_T represents the preset ignition angle, IVO represents the preset intake valve opening degree, EVC represents the preset exhaust valve opening degree, and 'gtsuite-v2016' represents the software for building the engine performance analysis model.
[0070] Step S30: calibrating the engine VVT according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature.
[0071] It can be understood that the engine VVT can be calibrated according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature output by the simulation, and the specific calibration method can be to select the optimal intake valve opening degree and exhaust valve opening degree from the preset intake valve opening degree and the preset exhaust valve opening degree input into the engine performance analysis model according to the output engine fuel consumption rate, the engine torque and the engine exhaust temperature.
[0072] The engine performance analysis model is built according to the corresponding performance parameters of the engine assembly, the preset intake valve opening degree and the preset exhaust valve opening degree are input into the engine performance analysis model for simulation to obtain the output parameters, the output parameters include the engine fuel consumption rate, the engine torque and the engine exhaust temperature, and then the engine VVT is calibrated according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature. The preset intake valve opening degree and the preset exhaust valve opening degree are input into the engine performance analysis model for simulation to obtain the output parameters, the output parameters corresponding to different intake valve opening degrees and different exhaust valve opening degrees can be obtained, and then the engine VVT is calibrated according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature, the optimal intake valve opening degree and the optimal exhaust valve opening degree can be determined according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature. Compared with the existing method of collecting multiple groups of data at each working condition point, the above method of the embodiment can effectively shorten the engine VVT calibration time and improve the engine VVT calibration efficiency.
[0073] Reference Figure 3 , Figure 3 is a flowchart of the second embodiment of the engine VVT calibration method of the application.
[0074] Based on the first embodiment, in the present embodiment, the step S30 comprises:
[0075] Step S301: selecting optimal engine fuel consumption, optimal engine torque and optimal engine exhaust temperature from the engine fuel consumption, the engine torque and the engine exhaust temperature;
[0076] It should be noted that the optimal engine fuel consumption refers to the optimal value in the engine fuel consumption, which can be set as the minimum value in the engine fuel consumption, and can also be set as other values. The optimal engine torque refers to the optimal value in the engine torque, which can be set as the torque value meeting the standard, and can also be set as other values. The optimal engine exhaust temperature refers to the optimal value in the engine exhaust temperature, which can be set as the value of the engine exhaust temperature less than the preset temperature, and can also be set as other values. The present embodiment does not make specific limitation on the values of the optimal engine fuel consumption, the optimal engine torque and the optimal engine exhaust temperature.
[0077] Further, in order to accurately determine the optimal engine fuel consumption, the optimal engine torque and the optimal engine exhaust temperature, in the present embodiment, the step S301 comprises: obtaining the corresponding target engine exhaust temperature when the engine torque reaches the preset value; obtaining the target engine fuel consumption corresponding to the target engine exhaust temperature within the preset temperature range; taking the minimum value of the target engine fuel consumption as the optimal engine fuel consumption, and determining the optimal engine torque and the optimal engine exhaust temperature corresponding to the optimal engine fuel consumption.
[0078] It can be understood that the preset value refers to a preset torque value, for example: 282Nm, 301Nm, etc. When the engine torque reaches the preset value, the target engine exhaust temperature corresponding to the engine torque reaching the preset value can be obtained, and the target engine exhaust temperature can include multiple engine exhaust temperatures. Then, the target engine fuel consumption corresponding to the target engine exhaust temperature within the preset temperature range is obtained, and the preset temperature range can be set to less than 950°, and can also be set to other ranges, which are not specifically limited in the present embodiment. The minimum value of the target engine fuel consumption can be taken as the optimal engine fuel consumption, the engine exhaust temperature corresponding to the optimal engine fuel consumption can be taken as the optimal engine exhaust temperature, and the engine torque corresponding to the optimal engine fuel consumption and the optimal engine exhaust temperature can be taken as the optimal engine torque.
[0079] Step S302: obtaining the optimal intake valve opening and the optimal exhaust valve opening corresponding to the optimal engine fuel consumption, the optimal engine torque and the optimal engine exhaust temperature;
[0080] It should be understood that different engine fuel consumption rates, engine torques and engine exhaust temperatures can be output after each group of preset intake valve opening degrees and preset exhaust valve opening degrees are input to the engine performance analysis model for simulation, and therefore the present embodiment can determine the corresponding intake valve opening degree and exhaust valve opening degree as the optimal intake valve opening degree and optimal exhaust valve opening degree according to the optimal engine fuel consumption rate, optimal engine torque and optimal engine exhaust temperature.
[0081] Step S303: determining the engine VVT calibration result according to the optimal intake valve opening degree and the optimal exhaust valve opening degree.
[0082] In a specific implementation, the engine VVT calibration result can include the optimal intake valve opening degree and the optimal exhaust valve opening degree, and be used to control the opening time and closing time of the intake valve and the exhaust valve.
[0083] The present embodiment selects the optimal engine fuel consumption rate, optimal engine torque and optimal engine exhaust temperature from the engine fuel consumption rate, engine torque and engine exhaust temperature, obtains the optimal intake valve opening degree and optimal exhaust valve opening degree corresponding to the optimal engine fuel consumption rate, optimal engine torque and optimal engine exhaust temperature, and determines the engine VVT calibration result according to the optimal intake valve opening degree and the optimal exhaust valve opening degree. The present embodiment can determine the optimal intake valve opening degree and optimal exhaust valve opening degree according to the parameters output by the simulation of the engine performance analysis model by obtaining the optimal intake valve opening degree and optimal exhaust valve opening degree corresponding to the optimal engine fuel consumption rate, optimal engine torque and optimal engine exhaust temperature, and can accurately calibrate the engine VVT.
[0084] Reference Figure 4 , Figure 4 FIG. 3 is a flowchart of a third embodiment of the engine VVT calibration method of the present application.
[0085] Based on the above embodiments, in the present embodiment, after the step S30, the method further includes:
[0086] Step S40: performing a bench test according to the optimal intake valve opening degree and the optimal exhaust valve opening degree to obtain a test result, the test result including a test fuel consumption rate, a test torque and a test exhaust temperature.
[0087] It should be understood that after the optimal intake valve opening degree and the optimal exhaust valve opening degree are obtained, a bench test can also be performed on the optimal intake valve opening degree and the optimal exhaust valve opening degree to determine whether the obtained optimal intake valve opening degree and optimal exhaust valve opening degree meet the development requirements.
[0088] Understandably, after bench testing, test results can be obtained, which may include test fuel consumption rate, test torque, and test exhaust temperature.
[0089] Furthermore, in order to accurately determine the test results, in this embodiment, step S40 includes: when the engine under test meets the preset conventional conditions, warming up the engine under test according to the preset engine coolant temperature and preset engine oil temperature; after the engine under test is warmed up, and when the engine under test meets the preset test boundary conditions, inputting the optimal intake valve opening and the optimal exhaust valve opening to the engine controller corresponding to the engine under test for testing, and obtaining the test results.
[0090] Understandably, the engine to be tested refers to the engine undergoing bench testing, and the preset routine conditions refer to the routine conditions that the engine to be tested needs to meet before testing. Specifically, these conditions can be set to whether the signals of each sensor are reasonable, the appropriate oil grade used in the test, and whether the combustion analyzer signals are reasonable, etc.
[0091] It should be understood that when the engine under test meets the preset conventional conditions, the engine under test can be warmed up according to the preset engine coolant temperature and preset engine oil temperature. In this embodiment, the preset engine coolant temperature can be set to 90° and the preset engine oil temperature can be set to 80°.
[0092] Specifically, the preset test boundary conditions in this embodiment can be set as the intake air temperature, intercooler temperature, intercooler pressure drop, maximum boost pressure, turbine exhaust temperature limit, catalytic converter center temperature limit, exhaust back pressure, minimum air-fuel ratio, and engine oil temperature limit of the engine under test. These values can be determined after calibration.
[0093] In practice, when the engine under test meets the normal conditions, is warmed up, and meets the preset test boundary conditions, the optimal intake valve opening and the optimal exhaust valve opening are input to the engine controller corresponding to the engine under test for testing, and the test results are obtained.
[0094] Step S50: Compare the test fuel consumption rate, the test torque, and the test exhaust temperature with the target results, and verify the engine VVT calibration results based on the comparison results.
[0095] It should be noted that the target result refers to the optimal values of engine fuel consumption rate, engine torque, and engine exhaust temperature set by the developers in advance. Then, the test fuel consumption rate, test torque, and test exhaust temperature are compared with the engine fuel consumption rate, engine torque, and engine exhaust temperature in the target result to obtain the comparison result.
[0096] It is understood that this embodiment can obtain the difference between each value, and if the difference is within the preset range, it indicates that the optimal intake valve opening and the optimal exhaust valve opening in the engine VVT calibration results meet the requirements.
[0097] This embodiment conducts bench tests based on optimal intake and exhaust valve openings to obtain test results, including fuel consumption rate, torque, and exhaust temperature. These results are then compared with target values, and the engine VVT calibration is verified based on the comparison. This embodiment verifies whether the optimal intake and exhaust valve openings meet the developers' requirements by conducting bench tests based on optimal intake and exhaust valve openings and comparing the results with target values.
[0098] Reference Figure 5 , Figure 5 This is a structural block diagram of the first embodiment of the engine VVT calibration device of the present invention.
[0099] like Figure 5 As shown, the engine VVT calibration device proposed in this embodiment of the invention includes:
[0100] Model building module 10 is used to build an engine performance analysis model based on the performance parameters corresponding to the engine assembly;
[0101] The model simulation module 20 is used to input the preset intake valve opening and the preset exhaust valve opening into the engine performance analysis model for simulation and to obtain output parameters, including engine fuel consumption rate, engine torque and engine exhaust temperature.
[0102] The engine VVT calibration module 30 is used to calibrate the engine VVT based on the engine fuel consumption rate, the engine torque and the engine exhaust temperature.
[0103] This embodiment constructs an engine performance analysis model based on the performance parameters of the engine assembly. Then, preset intake and exhaust valve openings are input into the engine performance analysis model for simulation to obtain output parameters, including engine fuel consumption rate, engine torque, and engine exhaust temperature. Engine VVT calibration is then performed based on these parameters. This embodiment, by inputting preset intake and exhaust valve openings into the engine performance analysis model for simulation and obtaining output parameters, can acquire output parameters corresponding to different intake and exhaust valve openings. Then, engine VVT calibration is performed based on engine fuel consumption rate, engine torque, and engine exhaust temperature. This allows for the determination of the optimal intake and exhaust valve openings based on these parameters. Compared to existing methods that require collecting multiple sets of data at each operating point, this embodiment, by inputting preset intake and exhaust valve openings into the engine performance analysis model for simulation, effectively shortens the engine VVT calibration time and improves the efficiency of engine VVT calibration.
[0104] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this invention. In practical applications, those skilled in the art can select some or all of the workflow to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.
[0105] In addition, for technical details not described in detail in this embodiment, please refer to the engine VVT calibration method provided in any embodiment of the present invention, which will not be repeated here.
[0106] Based on the first embodiment of the engine VVT calibration device of the present invention, a second embodiment of the engine VVT calibration device of the present invention is proposed.
[0107] In this embodiment, the model simulation module 20 is further used to obtain preset ignition angle, preset throttle opening, preset turbo blow-off valve diameter, and preset engine speed; call the engine performance analysis model through the engine bench model in the preset simulation software; input the preset intake valve opening, preset exhaust valve opening, preset ignition angle, preset throttle opening, preset turbo blow-off valve diameter, and preset engine speed into the engine performance analysis model for simulation to obtain output parameters.
[0108] Furthermore, the engine VVT calibration module 30 is also used to select the optimal engine fuel consumption rate, optimal engine torque, and optimal engine exhaust temperature from the engine fuel consumption rate, the engine torque, and the engine exhaust temperature; obtain the optimal intake valve opening and optimal exhaust valve opening corresponding to the optimal engine fuel consumption rate, the optimal engine torque, and the optimal engine exhaust temperature; and determine the engine VVT calibration result based on the optimal intake valve opening and the optimal exhaust valve opening.
[0109] Furthermore, the engine VVT calibration module 30 is also used to obtain the corresponding target engine exhaust temperature when the engine torque reaches a preset value; obtain the target engine fuel consumption rate corresponding to the target engine exhaust temperature being within a preset temperature range; take the minimum value among the target engine fuel consumption rates as the optimal engine fuel consumption rate, and determine the optimal engine torque and optimal engine exhaust temperature corresponding to the optimal engine fuel consumption rate.
[0110] Furthermore, the engine VVT calibration device also includes a bench test module 40, which is used to perform bench tests based on the optimal intake valve opening and the optimal exhaust valve opening to obtain test results, including test fuel consumption rate, test torque, and test exhaust temperature; compare the test fuel consumption rate, the test torque, and the test exhaust temperature with the target results, and verify the engine VVT calibration results based on the comparison results.
[0111] Furthermore, the bench test module 40 is also used to warm up the engine under test according to the preset engine coolant temperature and preset engine oil temperature when the engine under test meets the preset conventional conditions; after the engine under test is warmed up and the engine under test meets the preset test boundary conditions, the optimal intake valve opening and the optimal exhaust valve opening are input to the engine controller corresponding to the engine under test for testing to obtain test results.
[0112] Furthermore, the model building module 10 is also used to obtain the basic structure of the engine assembly, which includes: an intake system, a turbocharger, an intercooler, an intake manifold, intake valves, cylinders, a combustion model, a cooling model, exhaust valves, an exhaust manifold, and an exhaust system; and to build an engine performance analysis model based on the performance parameters corresponding to the intake system, the turbocharger, the intercooler, the intake manifold, the intake valves, the cylinders, the combustion model, the cooling model, the exhaust valves, the exhaust manifold, and the exhaust system.
[0113] Other embodiments or specific implementations of the engine VVT calibration device of the present invention can be referred to the above-described method embodiments, and will not be repeated here.
[0114] Furthermore, this embodiment of the invention also proposes a storage medium storing an engine VVT calibration program, which, when executed by a processor, implements the steps of the engine VVT calibration method described above.
[0115] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.
[0116] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.
[0117] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as read-only memory / random access memory, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.
[0118] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.
Claims
1. An engine VVT calibration method, characterized by, The engine VVT calibration method comprises the following steps: An engine performance analysis model is constructed according to corresponding performance parameters of an engine assembly; A preset intake valve opening degree and a preset exhaust valve opening degree are input into the engine performance analysis model for simulation to obtain output parameters, the output parameters comprising engine fuel consumption rate, engine torque and engine exhaust temperature; Engine VVT calibration is performed according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature; The step of performing engine VVT calibration according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature specifically comprises: When the engine torque reaches a preset value, a corresponding target engine exhaust temperature is obtained; A target engine fuel consumption rate corresponding to the target engine exhaust temperature within a preset temperature range is obtained; The minimum value of the target engine fuel consumption rate is taken as an optimal engine fuel consumption rate, and an optimal engine torque and an optimal engine exhaust temperature corresponding to the optimal engine fuel consumption rate are obtained; Optimal intake valve opening degrees and optimal exhaust valve opening degrees corresponding to the optimal engine fuel consumption rate, the optimal engine torque and the optimal engine exhaust temperature are obtained; An engine VVT calibration result is determined according to the optimal intake valve opening degrees and the optimal exhaust valve opening degrees.
2. The engine VVT calibration method of claim 1, wherein, The step of inputting a preset intake valve opening degree and a preset exhaust valve opening degree into the engine performance analysis model for simulation to obtain output parameters specifically comprises: A preset ignition angle, a preset throttle opening degree, a preset turbo pressure relief valve diameter and a preset engine speed are obtained; The engine performance analysis model is called through an engine bench model in a preset simulation software; The preset intake valve opening degree, the preset exhaust valve opening degree, the preset ignition angle, the preset throttle opening degree, the preset turbo pressure relief valve diameter and the preset engine speed are input into the engine performance analysis model for simulation to obtain output parameters.
3. The engine VVT calibration method of claim 1, wherein, After the step of performing engine VVT calibration according to the engine fuel consumption rate, the engine torque and the engine exhaust temperature, the method further comprises: Bench testing is performed according to the optimal intake valve opening degrees and the optimal exhaust valve opening degrees to obtain test results, the test results comprising test fuel consumption rate, test torque and test exhaust temperature; The test fuel consumption rate, the test torque and the test exhaust temperature are compared with target results, and the engine VVT calibration result is verified according to a comparison result.
4. The engine VVT calibration method of claim 3, wherein, The step of performing bench testing according to the optimal intake valve opening degrees and the optimal exhaust valve opening degrees to obtain test results specifically comprises: When a to-be-tested engine meets preset general conditions, the to-be-tested engine is warmed up according to a preset engine water temperature and a preset engine oil temperature; After the to-be-tested engine is warmed up and the to-be-tested engine meets preset test boundary conditions, the optimal intake valve opening degrees and the optimal exhaust valve opening degrees are input into an engine controller corresponding to the to-be-tested engine for testing to obtain test results.
5. The engine VVT calibration method of any one of claims 1-4, wherein, The step of constructing the engine performance analysis model according to the performance parameters corresponding to the engine assembly specifically comprises: The basic structure of the engine assembly comprises: an intake system, a supercharger, an intercooler, an intake manifold, an intake valve, a cylinder, a combustion model, a heat dissipation model, an exhaust valve, an exhaust manifold, and an exhaust system. The engine performance analysis model is constructed according to the performance parameters corresponding to the intake system, the supercharger, the intercooler, the intake manifold, the intake valve, the cylinder, the combustion model, the heat dissipation model, the exhaust valve, the exhaust manifold, and the exhaust system.
6. An engine VVT calibration device characterized by comprising: The engine VVT calibration device comprises: A model construction module configured to construct an engine performance analysis model according to performance parameters corresponding to an engine assembly. A model simulation module configured to input a preset intake valve opening degree and a preset exhaust valve opening degree into the engine performance analysis model for simulation, and obtain output parameters, which comprise an engine fuel consumption rate, an engine torque, and an engine exhaust temperature. An engine VVT calibration module configured to calibrate engine VVT according to the engine fuel consumption rate, the engine torque, and the engine exhaust temperature. The engine VVT calibration module is further configured to, when the engine torque reaches a preset value, obtain a corresponding target engine exhaust temperature, obtain a target engine fuel consumption rate corresponding to the target engine exhaust temperature being within a preset temperature range, take the minimum value of the target engine fuel consumption rate as an optimal engine fuel consumption rate, and obtain an optimal intake valve opening degree and an optimal exhaust valve opening degree corresponding to the optimal engine fuel consumption rate, the optimal engine torque, and the optimal engine exhaust temperature, and determine an engine VVT calibration result according to the optimal intake valve opening degree and the optimal exhaust valve opening degree.
7. An engine VVT calibration device characterized by, The device comprises a memory, a processor, and an engine VVT calibration program stored on the memory and executable on the processor, the engine VVT calibration program being configured to implement the steps of the engine VVT calibration method according to any one of claims 1 to 5.
8. A storage medium, characterized by The storage medium stores an engine VVT calibration program, and the engine VVT calibration program, when executed by a processor, implements the steps of the engine VVT calibration method according to any one of claims 1 to 5.