Method and system for improving transient response of engine, readable storage medium and vehicle

Abstract

The invention discloses a method and system for improving engine transient response, a readable storage medium and a vehicle. The method comprises the steps that engine attribute boundary parameters are obtained, and an engine thermodynamic model framework is established; debugging a valve lift height, a valve wrap angle and a valve overlap angle in the engine thermodynamic model frame, and performing inflation efficiency verification on the engine thermodynamic model frame based on a debugging result; and carrying out high-performance valve lift rack verification and whole vehicle verification on the engine thermodynamic model frame based on an inflation efficiency verification result. The invention provides an engine valve lift forward design method. By designing a proper valve lift curve, the inflation efficiency of an engine body is improved, and higher air inflow is achieved under the same supercharger capacity. Meanwhile, due to the fact that the air inflow is increased, the rotating speed of the supercharger is increased, the capacity of the supercharger is indirectly improved, the transient response torque value of the engine is effectively increased, and the problem that the transient torque of the engine is insufficient is solved.

Description

Technical Field

[0001] The present invention relates to the field of engines, and in particular to a method, system, readable storage medium and vehicle for improving transient response of an engine. Background Art

[0002] The transient response of a supercharged engine refers to the power response capability of a diesel engine during acceleration. Supercharged engines have better power density and fuel economy, but there may be some problems in transient response, mainly due to the lag of the turbine. Diesel engines use turbochargers to improve performance, but when the load changes suddenly, there is a delay in the compressor and the intake and exhaust system, and the turbine takes a certain amount of time to increase the speed, resulting in acceleration delay. This lag will lead to inconsistent power output and a poor driving experience.

[0003] At present, in order to solve the problem of transient response of supercharged engines, improving the response ability of turbochargers is a common measure to improve the acceleration of diesel engines. The key to improving the response ability of turbochargers is to reduce the rotational inertia and flow cross-sectional area of ​​turbochargers. Reducing the rotational inertia of superchargers can improve the response speed of superchargers.

[0004] However, the moment of inertia and flow area of ​​the supercharger depend on the design parameters of the supercharger turbine and impeller material, wheel diameter, Trim value, AR value, etc. In order to achieve the engine power and torque targets, these design parameters are fixed, with a small variable range and limited optimization potential for transient response. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide a method, system, readable storage medium and vehicle for improving the transient response of the engine, aiming to solve the problem that the current supercharger rotational inertia and flow area depend on the design parameters of the supercharger turbine and pressure wheel material, wheel diameter, Trim value, AR value, etc., the variable range is very small, and the optimization potential for transient response is limited.

[0006] To achieve the above object, the present invention provides a method for improving the transient response of an engine, the method comprising:

[0007] Obtain engine property boundary parameters and establish the engine thermodynamic model framework;

[0008] Debugging the valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamics model framework, and verifying the charging efficiency of the engine thermodynamics model framework based on the debugging results;

[0009] Based on the charging efficiency verification results, the engine thermodynamic model framework is subjected to high-performance valve lift bench verification and vehicle verification.

[0010] In summary, according to a method for improving the transient response of an engine proposed by the present invention, the engine property boundary parameters are obtained, and the engine thermodynamic model framework is constructed by using thermodynamic simulation software to be used for benchmarking the engine model, thereby ensuring the high reliability of verification. The valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamic model framework are debugged to obtain the optimal parameters in the above-mentioned different debugging processes, and then obtain better test data in the charging efficiency verification. Based on the results of the charging efficiency verification, the engine thermodynamic model framework is subjected to high-performance valve lift bench verification and vehicle verification, and the data obtained by simulation in the previous step is applied to the actual vehicle to ensure the reliability of the test data. The present invention provides a forward design method for engine valve lift. By designing a suitable valve lift curve, the charging efficiency of the engine body is improved, and a higher intake volume is achieved under the same supercharger capacity. At the same time, because the intake volume is increased, the supercharger speed is increased, thereby indirectly improving the supercharger capacity, effectively improving the engine transient response torque value, and improving the problem of insufficient engine transient torque.

[0011] According to one aspect of the above technical solution, the step of obtaining the engine property boundary parameters and establishing the engine thermodynamic model framework specifically includes:

[0012] Obtaining engine attribute boundary parameters, establishing an engine basic module, wherein the engine basic module at least includes an engine cylinder module, an intake and exhaust pipeline module, a valve module, an airway module, a supercharger module, an intercooler module and an EGR cooler module, and building an engine thermodynamic model framework based on engine thermodynamics software;

[0013] Based on the engine thermodynamic model framework parameters, the engine external characteristic operating condition model is benchmarked and the error is controlled within a preset error value. The engine thermodynamic model framework parameters at least include the bench measured power torque, intake and exhaust pressure, and temperature.

[0014] According to one aspect of the above technical solution, the step of debugging the valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamic model framework and verifying the charging efficiency of the engine thermodynamic model framework based on the debugging results specifically includes:

[0015] For the valve height sweep simulation, for the valve lifts at the preset first height, second height, third height, and fourth height, respectively, based on the control variable principle, the engine thermodynamic model framework that controls the valve lifts at the first height, second height, third height, and fourth height respectively calculates the charging efficiency at the same engine speed, and selects the optimal height based on the calculation results;

[0016] Based on the comparison of scanning point simulation, the engine thermodynamic model framework is controlled to calculate the charging efficiency under different valve wrap angles under the preset engine speed condition, and obtain the optimal valve wrap angle;

[0017] By adjusting the valve overlap angle selection, the valve overlap period is controlled, the engine thermodynamic model framework is controlled under different overlap period schemes, the instantaneous flow of the engine thermodynamic model framework is observed, and the reflux results and the optimal valve overlap period of each scheme are obtained.

[0018] According to one aspect of the above technical solution, the step of verifying the charging efficiency of the engine thermodynamic model framework specifically includes:

[0019] Calculate the charging efficiency simulation value of the engine thermodynamic model framework at different speeds under the optimal height, optimal valve wrap angle, and optimal valve overlap period of the engine thermodynamic model framework, and compare the charging efficiency simulation value with the charging efficiency target value,

[0020] If the charging efficiency simulation value is not less than the charging efficiency target value, bench verification is performed;

[0021] If the charging efficiency simulation value is less than the charging efficiency target value, the valve lift height, valve wrap angle, and valve overlap angle are re-adjusted until the charging efficiency simulation value reaches the charging efficiency target value.

[0022] According to one aspect of the above technical solution, based on the charging efficiency verification result, the steps of performing high-performance valve lift bench verification and vehicle verification on the engine thermodynamic model framework specifically include:

[0023] After the charging efficiency simulation value reaches the charging efficiency target value, a high-performance valve lift bench verification is performed on the bench, wherein the high-performance valve lift bench verification includes low-speed torque attainability verification and bench transient response verification;

[0024] In the low-speed torque achievement verification, the external characteristics of the high-performance valve lift are measured on the test bench, the low-speed torque target is set to increase the low-speed torque of the conventional valve lift by a first preset value, and the low-speed torque, maximum torque, and net power under the conventional valve lift and high-performance valve lift conditions are compared;

[0025] In the test bench transient response verification, the torque change rate at a preset engine speed under full throttle conditions is measured on the test bench, and a target is set that within a preset time of high-performance valve lift, the transient torque of the high-performance valve lift increases by a second preset value over the transient torque of the traditional valve lift, and the maximum torque of the high-performance valve lift increases by a third preset value over the maximum torque of the traditional valve lift.

[0026] According to one aspect of the above technical solution, based on the high performance valve lift bench verification results,

[0027] If the low-speed torque attainability verification and bench transient response verification do not meet the preset requirements, the charging efficiency target is increased, and the charging efficiency simulation value is compared with the charging efficiency target value;

[0028] If the low-speed torque attainability verification and bench transient response verification meet the preset requirements, the whole vehicle verification is carried out, and the acceleration time verification and power performance perception verification are carried out on the basic model and the high-performance valve lift model respectively;

[0029] If the verification results of the acceleration time and power performance perception of the high-performance valve lift model are inferior to those of the basic model, the preset requirements for low-speed torque and bench transient response are increased, and the high-performance valve lift bench verification results and preset requirements are re-compared;

[0030] If the verification results of the acceleration time and power performance perception of the high-performance valve lift model are better than those of the basic model, it is determined that the high-performance valve lift has the effect of increasing low-speed torque and improving the responsiveness of the entire vehicle.

[0031] The present invention further provides a system for improving the transient response of an engine, wherein the system for improving the transient response of an engine is used to implement the above-mentioned method for improving the transient response of an engine, and the system comprises:

[0032] A framework building module is used to obtain engine attribute boundary parameters and build an engine thermodynamic model framework;

[0033] A charging verification module, used to debug the valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamic model framework, and verify the charging efficiency of the engine thermodynamic model framework based on the debugging results;

[0034] The performance verification module is used to perform high-performance valve lift bench verification and vehicle verification on the engine thermodynamic model framework based on the charging efficiency verification result.

[0035] The present invention also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method for improving the transient response of an engine is implemented.

[0036] The present invention further provides a vehicle, the vehicle comprising a memory and a processor, wherein:

[0037] The memory is used to store computer programs;

[0038] When the processor is used to execute the computer program stored in the memory, the above-mentioned method for improving the transient response of the engine is implemented.

[0039] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a flow chart of a method for improving engine transient response in a first embodiment of the present invention;

[0041] Figure 2 It is a debugging line chart of the valve lift height in the first embodiment of the present invention;

[0042] Figure 3 It is a valve wrap angle debugging curve diagram in the first embodiment of the present invention;

[0043] Figure 4 It is a broken line diagram of valve overlap period debugging in the first embodiment of the present invention;

[0044] Figure 5 The test bench transient response verification result in the first embodiment of the present invention;

[0045] Figure 6 It is a structural schematic diagram of a system for improving engine transient response in a second embodiment of the present invention;

[0046] Figure 7 This is a schematic structural diagram of a vehicle applying a method for improving engine transient response in a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0048] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0050] Embodiment 1

[0051] like Figure 1 The flowchart of a method for improving the transient response of an engine in the present invention is shown. The method for improving the transient response of an engine includes the following steps S01 to S03, wherein:

[0052] S01. Obtain engine property boundary parameters and establish an engine thermodynamic model framework.

[0053] Obtain the boundary parameters of engine properties and establish the basic engine module. The basic engine module at least includes the engine cylinder module, intake and exhaust pipeline module, valve module, airway module, supercharger module, intercooler module and EGR cooler module. The engine thermodynamic model framework is built based on the engine thermodynamics software.

[0054] Based on the engine thermodynamic model framework parameters, the engine external characteristic operating condition model is benchmarked and the error is controlled within a preset error value. The engine thermodynamic model framework parameters include at least the bench measured power torque, intake and exhaust pressure, and temperature. The preset error value in this embodiment is 3% to ensure the reliability of the engine thermodynamic model framework.

[0055] S02. Debugging the valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamic model framework, and verifying the charging efficiency of the engine thermodynamic model framework based on the debugging results.

[0056] like Figure 2 As shown, for the valve height sweep simulation, for the preset first height 8.50mm, second height 9.00mm, third height 9.50mm, and fourth height 10.00mm valve lifts, based on the control variable principle, the engine thermodynamic model framework of the valve lifts of the first height 8.50mm, second height 9.00mm, third height 9.50mm, and fourth height 10.00mm is controlled respectively to calculate the charging efficiency at the same engine speed, and the optimal height is selected as the third height 9.50mm based on the calculation results.

[0057] like Figure 3 As shown, based on the scanning point simulation comparison, the engine thermodynamic model framework is controlled to calculate the charging efficiency under different valve wrap angles under the preset engine speed condition, and obtain the optimal valve wrap angle. The preset engine speed in this embodiment is 1000rpm, and according to Figure 3 As shown, the charging efficiency is highest when the intake valve wrap angle is 272 degrees.

[0058] like Figure 4As shown in the figure, by adjusting the valve overlap angle selection, the valve overlap period is controlled to ensure sufficient scavenging while avoiding abnormal intake and exhaust processes such as intake reflux and excessive scavenging. The engine thermodynamic model framework is controlled under different overlap period schemes, the instantaneous flow of the engine thermodynamic model framework is observed, and the reflux results and optimal valve overlap period of each scheme are obtained. Figure 4 It can be seen that the original scheme has serious intake recirculation, while the improved scheme has almost no intake recirculation. Through multiple rounds of iterative optimization, the optimal valve overlap period of 58 degrees can be obtained.

[0059] After debugging the valve lift height, valve wrap angle, and valve overlap angle, calculate the charging efficiency simulation value of the engine thermodynamic model framework at different speeds under the conditions of the optimal height of 9.50mm, the optimal valve wrap angle of 272deg, and the optimal valve overlap period of 58deg, and compare the charging efficiency simulation value with the charging efficiency target value. If the charging efficiency simulation value is not less than the charging efficiency target value, perform bench verification;

[0060] If the charging efficiency simulation value is less than the charging efficiency target value, the valve lift height, valve wrap angle, and valve overlap angle are re-adjusted until the charging efficiency simulation value reaches the charging efficiency target value.

[0061] As shown in Table 1, it is a comparison result between the charging efficiency simulation value and the charging efficiency target in the first embodiment of the present invention. When the engine speed is 1000rpm, 2000rpm, and 3000rpm, respectively, the charging efficiency simulation values ​​are 0.907, 0.928, and 0.903, respectively, which are greater than the charging efficiency target values ​​of 0.905, 0.920, and 0.900, respectively. Therefore, the engine thermodynamic model framework can be used for high-performance valve lift bench verification and vehicle verification.

[0062] Engine speed (rpm) Charging efficiency target (-) Charging efficiency simulation value (-) 1000 0.905 0.907 2000 0.920 0.928 3000 0.900 0.903

[0063] Table 1

[0064] S03. Based on the charging efficiency verification result, high-performance valve lift bench verification and vehicle verification are performed on the engine thermodynamic model framework.

[0065] After the charging efficiency simulation value reaches the charging efficiency target value, a high-performance valve lift bench verification is carried out on the bench. The high-performance valve lift bench verification includes low-speed torque achievement verification and bench transient response verification.

[0066] In the low-speed torque attainment verification, the external characteristics of the high-performance valve lift are measured on the test bench, and the low-speed torque target is set to increase the low-speed torque of the conventional valve lift by a first preset value of 50Nm, and the low-speed torque, maximum torque, and net power are compared under the two working conditions of the conventional valve lift and the high-performance valve lift. As shown in Table 2, Table 2 is the low-speed torque attainment verification result in the first embodiment of the present invention. After collecting the verification data, the low-speed torque in the high-performance valve lift is 303Nm@1000rpm, which is greater than the low-speed torque of the conventional valve lift of 240Nm@1000rpm, and the difference is greater than the first preset value of 50Nm.

[0067] external characteristics Conventional valve lift High performance valve lift Low speed torque 240Nm@1000rpm 303Nm@1000rpm Maximum Torque 400Nm@1400-2400rpm 400Nm@1200-2400rpm Net Power 106KW@2800rpm 104KW@2800rpm

[0068] Table 2

[0069] In the bench transient response verification, the torque change rate at the preset engine speed under full throttle working condition is measured on the bench, and the target is set that within the preset time of high-performance valve lift of 2s, the transient torque of high-performance valve lift increases by a second preset value of 30Nm compared with the transient torque of traditional valve lift, and the maximum torque of high-performance valve lift increases by a third preset value of 50Nm compared with the maximum torque of traditional valve lift. Figure 5 As shown, the high-performance valve lift reaches the preset target.

[0070] If the low-speed torque attainability verification and bench transient response verification do not meet the preset requirements, the charging efficiency target is increased, and the charging efficiency simulation value is compared with the charging efficiency target value;

[0071] If the low-speed torque attainability verification and the bench transient response verification meet the preset requirements, the whole vehicle verification is carried out, and the acceleration time verification and the power performance perception verification are carried out on the basic vehicle model and the high-performance valve lift vehicle model respectively, as shown in Table 3, which is the whole vehicle verification result in the first embodiment of the present invention:

[0072]

[0073] Table 3

[0074] In the acceleration time verification, the high-performance valve lift models performed better than the basic models in terms of 0km / h-80km / h acceleration time, the second highest gear 30km / h-80km / h acceleration time, and the highest gear 50km / h-80km / h acceleration time.

[0075] At the same time, in the dynamic performance perception verification, the high-performance valve lift models performed better than the basic models in 1s acceleration, 1s average acceleration, 3s maximum acceleration, and 3s average acceleration.

[0076] If the verification results of the acceleration time and power performance perception of the high-performance valve lift model are inferior to those of the basic model, the preset requirements for low-speed torque and bench transient response are increased, and the high-performance valve lift bench verification results and preset requirements are re-compared;

[0077] If the verification results of the acceleration time and power performance perception of the high-performance valve lift model are better than those of the basic model, it is determined that the high-performance valve lift has the effect of increasing low-speed torque and improving the responsiveness of the entire vehicle.

[0078] In summary, according to a method for improving the transient response of an engine proposed by the present invention, the engine property boundary parameters are obtained, and the engine thermodynamic model framework is constructed by using thermodynamic simulation software to be used for benchmarking the engine model, thereby ensuring the high reliability of verification. The valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamic model framework are debugged to obtain the optimal parameters in the above-mentioned different debugging processes, and then obtain better test data in the charging efficiency verification. Based on the results of the charging efficiency verification, the engine thermodynamic model framework is subjected to high-performance valve lift bench verification and vehicle verification, and the data obtained by simulation in the previous step is applied to the actual vehicle to ensure the reliability of the test data. The present invention provides a forward design method for engine valve lift. By designing a suitable valve lift curve, the charging efficiency of the engine body is improved, and a higher intake volume is achieved under the same supercharger capacity. At the same time, because the intake volume is increased, the supercharger speed is increased, thereby indirectly improving the supercharger capacity, effectively improving the engine transient response torque value, and improving the problem of insufficient engine transient torque.

[0079] Embodiment 2

[0080] Another aspect of the present invention is to provide a system for improving the transient response of an engine. Figure 6 , which is a schematic diagram of the structure of a system for improving the transient response of an engine in a second embodiment of the present invention, wherein the system for improving the transient response of an engine comprises:

[0081] A framework building module 11 is used to obtain engine attribute boundary parameters and build an engine thermodynamic model framework;

[0082] A charging verification module 12, used for debugging the valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamics model framework, and verifying the charging efficiency of the engine thermodynamics model framework based on the debugging results;

[0083] The performance verification module 13 is used to perform high-performance valve lift bench verification and vehicle verification on the engine thermodynamic model framework based on the charging efficiency verification result.

[0084] Furthermore, in some optional embodiments, the framework building module 11 further includes:

[0085] A framework building unit, used to obtain engine attribute boundary parameters, build an engine basic module, the engine basic module at least includes an engine cylinder module, an intake and exhaust pipeline module, a valve module, an airway module, a supercharger module, an intercooler module and an EGR cooler module, and build an engine thermodynamic model framework based on engine thermodynamics software;

[0086] Based on the engine thermodynamic model framework parameters, the engine external characteristic operating condition model is benchmarked and the error is controlled within a preset error value. The engine thermodynamic model framework parameters at least include the bench measured power torque, intake and exhaust pressure, and temperature.

[0087] Furthermore, in some optional embodiments, the inflation verification module 12 further includes:

[0088] The charging verification unit is used to simulate the valve height sweep point, respectively, for the valve lifts of the preset first height, second height, third height, and fourth height, based on the control variable principle, respectively control the engine thermodynamic model framework of the valve lifts of the first height, second height, third height, and fourth height to calculate the charging efficiency at the same engine speed, and select the optimal height based on the calculation result;

[0089] Based on the comparison of scanning point simulation, the engine thermodynamic model framework is controlled to calculate the charging efficiency under different valve wrap angles under the preset engine speed condition, and obtain the optimal valve wrap angle;

[0090] By adjusting the valve overlap angle selection, the valve overlap period is controlled, the engine thermodynamic model framework is controlled under different overlap period schemes, the instantaneous flow of the engine thermodynamic model framework is observed, and the reflux results and the optimal valve overlap period of each scheme are obtained.

[0091] Calculate the charging efficiency simulation value of the engine thermodynamic model framework at different speeds under the optimal height, optimal valve wrap angle, and optimal valve overlap period of the engine thermodynamic model framework, and compare the charging efficiency simulation value with the charging efficiency target value,

[0092] If the charging efficiency simulation value is not less than the charging efficiency target value, bench verification is performed;

[0093] If the charging efficiency simulation value is less than the charging efficiency target value, the valve lift height, valve wrap angle, and valve overlap angle are re-adjusted until the charging efficiency simulation value reaches the charging efficiency target value.

[0094] Furthermore, in some optional embodiments, the performance verification module 13 further includes:

[0095] A performance verification unit, used for performing high-performance valve lift bench verification on a test bench after the charging efficiency simulation value reaches the charging efficiency target value, wherein the high-performance valve lift bench verification includes low-speed torque attainability verification and test bench transient response verification;

[0096] In the low-speed torque achievement verification, the external characteristics of the high-performance valve lift are measured on the test bench, the low-speed torque target is set to increase the low-speed torque of the conventional valve lift by a first preset value, and the low-speed torque, maximum torque, and net power under the conventional valve lift and high-performance valve lift conditions are compared;

[0097] In the test bench transient response verification, the torque change rate at a preset engine speed under full throttle conditions is measured on the test bench, and a target is set that within a preset time of high-performance valve lift, the transient torque of the high-performance valve lift increases by a second preset value over the transient torque of the traditional valve lift, and the maximum torque of the high-performance valve lift increases by a third preset value over the maximum torque of the traditional valve lift.

[0098] Based on the high performance valve lift bench verification results,

[0099] If the low-speed torque attainability verification and bench transient response verification do not meet the preset requirements, the charging efficiency target is increased, and the charging efficiency simulation value is compared with the charging efficiency target value;

[0100] If the low-speed torque attainability verification and bench transient response verification meet the preset requirements, the whole vehicle verification is carried out, and the acceleration time verification and power performance perception verification are carried out on the basic model and the high-performance valve lift model respectively;

[0101] If the verification results of the acceleration time and power performance perception of the high-performance valve lift model are inferior to those of the basic model, the preset requirements for low-speed torque and bench transient response are increased, and the high-performance valve lift bench verification results and preset requirements are re-compared;

[0102] If the verification results of the acceleration time and power performance perception of the high-performance valve lift model are better than those of the basic model, it is determined that the high-performance valve lift has the effect of increasing low-speed torque and improving the responsiveness of the entire vehicle.

[0103] In summary, according to a system for improving the transient response of an engine proposed by the present invention, the engine thermodynamic model framework is constructed by obtaining the boundary parameters of the engine properties and using thermodynamic simulation software to be used for benchmarking the engine model, thereby ensuring the high reliability of verification. The valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamic model framework are debugged to obtain the optimal parameters in the above-mentioned different debugging processes, thereby obtaining better test data in the charging efficiency verification. Based on the verification results of the charging efficiency, the engine thermodynamic model framework is subjected to high-performance valve lift bench verification and vehicle verification, and the data obtained by the simulation in the previous step is applied to the actual vehicle to ensure the reliability of the test data. The present invention provides a forward design method for the engine valve lift. By designing a suitable valve lift curve, the charging efficiency of the engine body is improved, and a higher intake volume is achieved under the same supercharger capacity. At the same time, because the intake volume is increased, the supercharger speed is increased, thereby indirectly improving the supercharger capacity, effectively improving the engine transient response torque value, and improving the problem of insufficient engine transient torque.

[0104] Embodiment 3

[0105] Another aspect of the present invention further provides a computer-readable storage medium having one or more computer programs stored thereon, which implement the above-mentioned method for improving engine transient response when executed by a processor.

[0106] Those skilled in the art will appreciate that the logic or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable storage medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable storage medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0107] More specific examples of computer-readable storage media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable storage medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or processing in another suitable manner as necessary, and then stored in a computer memory.

[0108] Embodiment 4

[0109] Another aspect of the present invention provides a vehicle, see Figure 7 , shown is a vehicle in the fourth embodiment of the present invention, including a memory 20, a processor 10, and a computer program 30 stored in the memory and executable on the processor, wherein the processor 10 implements the method for improving the transient response of the engine as described above when executing the computer program 30.

[0110] Specifically, the vehicle may be a computer, a vehicle testing device, etc. The processor 10 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor or other data processing chip in some embodiments, and is used to run the program code or process data stored in the memory 20, such as executing an access restriction program.

[0111] The memory 20 includes at least one type of readable storage medium, and the readable storage medium includes a flash memory, a hard disk, a multimedia card, a card-type memory (for example, an SD or DX memory, etc.), a magnetic memory, a disk, an optical disk, etc. In some embodiments, the memory 20 may be an internal storage unit of the vehicle, such as a hard disk of the vehicle. In other embodiments, the memory 20 may also be an external storage device of the vehicle, such as a plug-in hard disk equipped on the vehicle, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Further, the memory 20 may also include both an internal storage unit of the vehicle and an external storage device. The memory 20 may be used not only to store application software and various types of data installed in the vehicle, but also to temporarily store data that has been output or is to be output.

[0112] It should be pointed out that Figure 7 The structure shown does not constitute a limitation on the vehicle. In other embodiments, the vehicle may include Figure 7 Fewer or more components may be shown, or certain components may be combined, or arranged differently.

[0113] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or a combination thereof: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0114] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0115] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for improving engine transient response, characterized in that: The method for improving the transient response of an engine comprises: Obtain engine property boundary parameters and establish the engine thermodynamic model framework; Debugging the valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamics model framework, and verifying the charging efficiency of the engine thermodynamics model framework based on the debugging results; Based on the charging efficiency verification results, the engine thermodynamic model framework is subjected to high-performance valve lift bench verification and vehicle verification.

2. The method for improving engine transient response according to claim 1, characterized in that: The step of obtaining the engine property boundary parameters and establishing the engine thermodynamic model framework specifically includes: Obtaining engine attribute boundary parameters, establishing an engine basic module, wherein the engine basic module at least includes an engine cylinder module, an intake and exhaust pipeline module, a valve module, an airway module, a supercharger module, an intercooler module and an EGR cooler module, and building an engine thermodynamic model framework based on engine thermodynamics software; Based on the engine thermodynamic model framework parameters, the engine external characteristic operating condition model is benchmarked and the error is controlled within a preset error value. The engine thermodynamic model framework parameters at least include the bench measured power torque, intake and exhaust pressure, and temperature.

3. The method for improving engine transient response according to claim 1, characterized in that: The step of debugging the valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamic model framework and verifying the charging efficiency of the engine thermodynamic model framework based on the debugging results specifically includes: For the valve height sweep simulation, for the valve lifts at the preset first height, second height, third height, and fourth height, respectively, based on the control variable principle, the engine thermodynamic model framework that controls the valve lifts at the first height, second height, third height, and fourth height respectively calculates the charging efficiency at the same engine speed, and selects the optimal height based on the calculation results; Based on the comparison of scanning point simulation, the engine thermodynamic model framework is controlled to calculate the charging efficiency under different valve wrap angles under the preset engine speed condition, and obtain the optimal valve wrap angle; By adjusting the valve overlap angle selection, the valve overlap period is controlled, the engine thermodynamic model framework is controlled under different overlap period schemes, the instantaneous flow of the engine thermodynamic model framework is observed, and the reflux results and the optimal valve overlap period of each scheme are obtained.

4. The method for improving engine transient response according to claim 3, characterized in that: The step of verifying the charging efficiency of the engine thermodynamic model framework specifically includes: Calculate the charging efficiency simulation value of the engine thermodynamic model framework at different speeds under the optimal height, optimal valve wrap angle, and optimal valve overlap period of the engine thermodynamic model framework, and compare the charging efficiency simulation value with the charging efficiency target value, If the charging efficiency simulation value is not less than the charging efficiency target value, bench verification is performed; If the charging efficiency simulation value is less than the charging efficiency target value, the valve lift height, valve wrap angle, and valve overlap angle are re-adjusted until the charging efficiency simulation value reaches the charging efficiency target value.

5. The method for improving engine transient response according to claim 1, characterized in that: The step of performing high-performance valve lift bench verification and vehicle verification on the engine thermodynamics model framework based on the charging efficiency verification result specifically includes: After the charging efficiency simulation value reaches the charging efficiency target value, a high-performance valve lift bench verification is performed on the bench, wherein the high-performance valve lift bench verification includes low-speed torque attainability verification and bench transient response verification; In the low-speed torque achievement verification, the external characteristics of the high-performance valve lift are measured on the test bench, the low-speed torque target is set to increase the low-speed torque of the conventional valve lift by a first preset value, and the low-speed torque, maximum torque, and net power under the conventional valve lift and high-performance valve lift conditions are compared; In the test bench transient response verification, the torque change rate at a preset engine speed under full throttle conditions is measured on the test bench, and a target is set that within a preset time of high-performance valve lift, the transient torque of the high-performance valve lift increases by a second preset value over the transient torque of the traditional valve lift, and the maximum torque of the high-performance valve lift increases by a third preset value over the maximum torque of the traditional valve lift.

6. The method for improving engine transient response according to claim 5, characterized in that: Based on the high performance valve lift bench verification results, If the low-speed torque attainability verification and bench transient response verification do not meet the preset requirements, the charging efficiency target is increased, and the charging efficiency simulation value is compared with the charging efficiency target value; If the low-speed torque attainability verification and bench transient response verification meet the preset requirements, the whole vehicle verification is carried out, and the acceleration time verification and power performance perception verification are carried out on the basic model and the high-performance valve lift model respectively; If the verification results of the acceleration time and power performance perception of the high-performance valve lift model are inferior to those of the basic model, the preset requirements for low-speed torque and bench transient response are increased, and the high-performance valve lift bench verification results and preset requirements are re-compared; If the verification results of the acceleration time and power performance perception of the high-performance valve lift model are better than those of the basic model, it is determined that the high-performance valve lift has the effect of increasing low-speed torque and improving the responsiveness of the entire vehicle.

7. A system for improving engine transient response, the system for improving engine transient response is used to implement the method for improving engine transient response according to any one of claims 1 to 6, the system comprising: A framework building module is used to obtain engine attribute boundary parameters and build an engine thermodynamic model framework; A charging verification module, used to debug the valve lift height, valve wrap angle, and valve overlap angle in the engine thermodynamic model framework, and verify the charging efficiency of the engine thermodynamic model framework based on the debugging results; The performance verification module is used to perform high-performance valve lift bench verification and vehicle verification on the engine thermodynamic model framework based on the charging efficiency verification result.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the method for improving engine transient response as claimed in any one of claims 1 to 6 is implemented.

9. A vehicle, characterized in that: The vehicle comprises a memory and a processor, wherein: The memory is used to store computer programs; When the processor is used to execute the computer program stored in the memory, the method for improving the transient response of the engine as described in any one of claims 1 to 6 is implemented.

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