Performance evaluation method, system, storage medium and vehicle of engine cooling system

Abstract

The present invention proposes a performance evaluation method, system, storage medium and vehicle for an engine cooling system, the method comprising: obtaining the vehicle thermal management issuance operating conditions, water temperature target and pressure target according to vehicle parameters; performing an engine thermal load test according to engine speed, engine power and engine torque to obtain the thermal load of the engine under the corresponding vehicle operating conditions; constructing an initial three-dimensional model of the cooling system according to the thermal load of the engine, and obtaining the water flow, pressure distribution and vehicle water temperature distribution of each component of the cooling system according to the initial three-dimensional model of the cooling system to evaluate the cooling performance, and optimizing the initial three-dimensional model of the cooling system according to the evaluation results to obtain the final three-dimensional model of the cooling system. The performance evaluation method of the engine cooling system proposed by the present invention can perform a comprehensive evaluation before designing the cooling system, and continuously optimize the evaluation results so that the engine cooling system can achieve a better cooling effect.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle engine cooling system evaluation, and in particular to a performance evaluation method, system, storage medium and vehicle for an engine cooling system. Background Art

[0002] The function of the cooling system is to dissipate part of the heat absorbed by the heated parts in time to ensure that the engine works at the most suitable temperature. The cooling system of the engine is divided into air cooling and water cooling. The cooling system with air as the cooling medium is called the air cooling system. The cooling system with coolant as the cooling medium is called the water cooling system.

[0003] When the vehicle engine is working, the gas temperature in the cylinder can be as high as 1727-2527℃. If it is not cooled in time, the temperature of the engine parts will be too high, especially the parts that are in direct contact with the high-temperature gas. The normal fit clearance will be affected due to thermal expansion, resulting in obstruction or even jamming of moving parts. In addition, high temperature will also cause the mechanical strength of engine parts to decrease, making the lubricating oil ineffective, etc. Therefore, it is necessary to match a suitable cooling system in the development stage of the vehicle engine to ensure that the engine has good heat dissipation performance.

[0004] The rationality of the matching development of the cooling system not only determines the development cost of each part of the cooling system, but also affects the design and development of high-cost parts such as the body and frame. In the existing technology, the matching development process of the vehicle engine cooling system is generally based on the personal experience of engineers to roughly calculate the parameters before designing. This method leads to incomplete evaluation of the cooling system in the development stage, resulting in low accuracy of the developed cooling system, resulting in increased development costs, and even situations that do not meet actual needs. Summary of the invention

[0005] Based on this, an object of the present invention is to provide a performance evaluation method, system, storage medium and vehicle for an engine cooling system to solve at least one of the above problems.

[0006] A performance evaluation method for an engine cooling system according to the present invention comprises:

[0007] Obtain vehicle parameters of the target vehicle corresponding to this cooling system development project, and obtain vehicle thermal management release working conditions, water temperature target and pressure target based on the vehicle parameters. The release working conditions include driving parameters and thermal management parameters.

[0008] Acquiring an engine speed, an engine power, and an engine torque of a target vehicle according to the driving parameters and the thermal management parameters, and performing an engine thermal load test according to the engine speed, the engine power, and the engine torque to obtain a thermal load of the engine under a corresponding vehicle operating condition;

[0009] Constructing an initial three-dimensional model of the cooling system according to the heat load of the engine, and obtaining the water flow, pressure distribution, and vehicle water temperature distribution of each component of the cooling system according to the initial three-dimensional model of the cooling system;

[0010] The cooling performance of the water flow rate, pressure distribution of each component and the water temperature distribution of the whole vehicle is evaluated according to the water temperature target and the pressure target, and the initial three-dimensional model of the cooling system is optimized according to the evaluation results to obtain the final three-dimensional model of the cooling system.

[0011] In summary, according to the above-mentioned performance evaluation method of the engine cooling system, a comprehensive and detailed matching development evaluation is conducted on the cooling performance of the engine cooling system to ensure that the matching development of the engine cooling system is more accurate and reasonable, which is conducive to reducing the development cost. Specifically, firstly, the vehicle parameters of the vehicle to be developed are obtained to obtain the relevant goals of the matching development of the cooling system, namely, the issuing working conditions, water temperature targets and pressure targets, etc., and then the engine speed, engine power and engine torque are calculated according to the development goals to start the engine thermal load test, so as to obtain the thermal load of the engine under the issuing working conditions, and then the initial three-dimensional model of the cooling system is preliminarily constructed according to the thermal load, and the water flow, pressure distribution, vehicle water temperature distribution and other parameters of each part are obtained in turn under the initial three-dimensional model, and then the water flow, pressure distribution and vehicle water temperature distribution are compared with the development goals, so as to optimize the initial model to obtain the final three-dimensional model of the cooling system, thereby completing the evaluation of the development stage, and by accurately calculating each parameter and optimizing the obtained model, it is ensured that the obtained final three-dimensional model has a high degree of matching with the engine, meets actual needs, and effectively reduces the development cost.

[0012] Further, the driving parameters include speed information and slope information under the driving condition, the thermal management parameters include ambient temperature, gear position of a transmission, and trailer mass, and after the step of obtaining an engine speed, an engine power, and an engine torque of a target vehicle according to the driving parameters and the thermal management parameters, and performing an engine thermal load test according to the engine speed, the engine power, and the engine torque to obtain a thermal load of the engine under the corresponding vehicle condition, the step further includes:

[0013] Carry out vehicle simulation test according to speed information, slope information, ambient temperature, gear position of transmission, and trailer mass under driving conditions, and obtain vehicle parameter information according to the test results;

[0014] A three-dimensional model of the vehicle grille and a three-dimensional model of the vehicle cabin are respectively constructed according to the vehicle parameter information.

[0015] Furthermore, after the step of respectively establishing a three-dimensional model of a vehicle grille and a three-dimensional model of a vehicle cabin according to the vehicle parameter information, the step further includes:

[0016] Set the wind resistance and heat dissipation performance of the cooling system, and calculate the air volume parameters of each component of the cooling system based on the three-dimensional model of the vehicle grille and the three-dimensional model of the vehicle cabin. The cooling system components include the radiator, condenser, intercooler and oil cooler;

[0017] The initial three-dimensional model of the cooling system is constructed according to the air volume parameters of each component of the cooling system and the heat load of the engine.

[0018] Furthermore, the step of evaluating the cooling performance of the water flow rate, pressure distribution of each component and the water temperature distribution of the whole vehicle according to the water temperature target and the pressure target, and optimizing the initial three-dimensional model of the cooling system according to the evaluation results to obtain the final three-dimensional model of the cooling system includes:

[0019] Acquire characteristic parameters corresponding to the performance deficiency according to the evaluation results, and optimize the initial three-dimensional model of the cooling system according to the performance evaluation data corresponding to the characteristic parameters and the evaluation target;

[0020] Repeat the test of the water flow, pressure distribution and vehicle water temperature distribution of the optimized initial 3D model of the cooling system until the evaluation result is passed and the final 3D model of the cooling system is obtained;

[0021] The dimension parameters of each part of the cooling system are obtained according to the final three-dimensional model of the cooling system.

[0022] Furthermore, the step of obtaining the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and thermal management parameters includes:

[0023] The engine speed is obtained according to the following formula:

[0024]

[0025] Among them: n is the engine speed (in rpm), v is the vehicle speed (in kph), kt is the gear ratio of the transmission, kf is the main reduction ratio, and Rt is the rolling radius of the driving wheel.

[0026] Furthermore, the step of acquiring the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and thermal management parameters further includes:

[0027] The engine power is obtained according to the following formula:

[0028] Pe=Peo+Pa

[0029] Among them, Pe is the total engine power, Peo is the engine output power, and Pa is the engine accessory power;

[0030] The calculation formula of the engine output power is:

[0031] Peo=P / η

[0032] Among them, Peo is the engine output power, P is the vehicle wheel power, and η is the powertrain transmission efficiency;

[0033] The calculation formula of the powertrain transmission efficiency is:

[0034] η=ηt*ηT*ηf

[0035] Among them, η is the powertrain transmission efficiency, ηt is the gearbox transmission efficiency, ηT is the torque converter transmission efficiency, and ηf is the main reducer transmission efficiency;

[0036] The calculation formula of the automobile wheel power is:

[0037] P=F*v / 3600

[0038] Among them, P is the wheel power of the car, F is the traction of the whole vehicle, and v is the speed of the vehicle;

[0039] The calculation formula of the vehicle traction force is:

[0040] F=fr+fa+fl

[0041] Among them, F is the traction of the whole vehicle, fr is the rolling resistance, fa is the windward resistance (unit N), and fl is the slope resistance;

[0042] The calculation formula of the slope resistance is:

[0043] fl=mv*L / (mv*kr+10000) 1 / 2

[0044] Among them, fl is the slope resistance, L is the slope, mv is the maximum total mass of the vehicle, and kr is the rolling coefficient;

[0045] The calculation formula of the windward resistance is:

[0046] fa=(ka+Aa)*v 2 / 21.15*288.2 / (273.15+T)

[0047] Among them, fa is the headwind resistance, ka is the drag coefficient, Aa is the headwind area, v is the vehicle speed, and T is the ambient temperature;

[0048] The calculation formula of the rolling resistance is:

[0049] fr=(mv+mt)*9.8*kr*100 / (L 2 +100 2 ) 1 / 2

[0050] Among them, fr is the rolling resistance, mv is the maximum total mass of the vehicle, mt is the mass of the trailer, kr is the rolling coefficient, and L is the slope.

[0051] Furthermore, the step of acquiring the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and thermal management parameters further includes:

[0052] The engine torque is obtained according to the following formula:

[0053] Te=9550*Pe / n

[0054] Among them, Te is the engine working torque, Pe is the total engine power, and n is the engine speed.

[0055] According to an embodiment of the present invention, a performance evaluation system for an engine cooling system comprises:

[0056] An evaluation target acquisition module is used to acquire vehicle parameters of the target vehicle corresponding to this cooling system development project, and acquire the vehicle thermal management issuance working condition, water temperature target and pressure target according to the vehicle parameters. The issuance working condition includes driving parameters and thermal management parameters.

[0057] a thermal load calculation module, used for obtaining the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and the thermal management parameters, and performing an engine thermal load test according to the engine speed, the engine power and the engine torque to obtain the thermal load of the engine under the corresponding vehicle working condition;

[0058] A model building module is used to build an initial three-dimensional model of the cooling system according to the heat load of the engine, and obtain the water flow, pressure distribution and vehicle water temperature distribution of each component of the cooling system according to the initial three-dimensional model of the cooling system;

[0059] The model evaluation module is used to evaluate the cooling performance of the water flow rate, pressure distribution of each component and the water temperature distribution of the whole vehicle according to the water temperature target and pressure target, and optimize the initial three-dimensional model of the cooling system according to the evaluation results to obtain the final three-dimensional model of the cooling system.

[0060] Another aspect of the present invention provides a storage medium storing one or more programs, which, when executed, implement the above-mentioned method for evaluating the performance of an engine cooling system.

[0061] Another aspect of the present invention further provides a vehicle, the vehicle comprising a memory and a processor, wherein:

[0062] The memory is used to store computer programs;

[0063] When the processor is used to execute the computer program stored in the memory, the performance evaluation method of the engine cooling system as described above is implemented.

[0064] 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 will be learned through embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 A flow chart of a method for evaluating the performance of an engine cooling system according to a first embodiment of the present invention;

[0066] Figure 2 A flow chart of a method for evaluating the performance of an engine cooling system according to a second embodiment of the present invention;

[0067] Figure 3 This is a schematic structural diagram of a performance evaluation system for an engine cooling system according to a third embodiment of the present invention.

[0068] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0069] 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.

[0070] 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.

[0071] 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.

[0072] See also Figure 1 , which is a flow chart of a method for evaluating the performance of an engine cooling system in a first embodiment of the present invention, the method comprises steps S01 to S04, wherein:

[0073] Step S01: Obtain vehicle parameters of the target vehicle corresponding to this cooling system development project, and obtain vehicle thermal management issuance working conditions, water temperature target and pressure target according to the vehicle parameters, wherein the issuance working conditions include driving parameters and thermal management parameters;

[0074] It should be noted that the purpose of developing the cooling system is to match the engine in the vehicle development stage. During the cooling system matching development process, it is first necessary to determine the relevant parameters of the target vehicle in this project development. The target vehicle is the vehicle corresponding to the evaluation project. In this embodiment, the vehicle parameters include but are not limited to tire rolling radius, rolling resistance coefficient, maximum total mass of the vehicle, main reduction ratio, gearbox gear ratio, gearbox transmission efficiency, main reducer transmission efficiency, torque converter transmission efficiency, vehicle drag coefficient, frontal area and accessory load.

[0075] After obtaining various vehicle parameters, the goal of this cooling system matching development project is determined based on the vehicle parameters, that is, to develop a cooling system that is highly matched with the vehicle engine to prevent situations that do not meet actual needs and at the same time improve the rationality of the cooling system development.

[0076] Step S02: acquiring the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and the thermal management parameters, and performing an engine thermal load test according to the engine speed, the engine power and the engine torque to obtain the thermal load of the engine under the corresponding vehicle working condition;

[0077] It can be understood that the driving parameters at least include speed information and slope information under driving conditions, and the thermal management parameters at least include ambient temperature, gearbox gear position and trailer mass, and then the engine power, speed and torque of the target vehicle are accurately calculated based on the acquired data, specifically:

[0078] The engine speed is obtained according to the following formula:

[0079]

[0080] Among them: n is the engine speed (in rpm), v is the vehicle speed (in kph), kt is the gear ratio of the transmission, kf is the main reduction ratio, and Rt is the rolling radius of the driving wheel.

[0081] Furthermore, the engine power is obtained according to the following formula:

[0082] Pe=Peo+Pa

[0083] Among them, Pe is the total engine power, Peo is the engine output power, and Pa is the engine accessory power;

[0084] The calculation formula of the engine output power is:

[0085] Peo=P / η

[0086] Among them, Peo is the engine output power, P is the vehicle wheel power, and η is the powertrain transmission efficiency;

[0087] The calculation formula of the powertrain transmission efficiency is:

[0088] η=ηt*ηT*ηf

[0089] Among them, η is the powertrain transmission efficiency, ηt is the gearbox transmission efficiency, ηT is the torque converter transmission efficiency, and ηf is the main reducer transmission efficiency;

[0090] The calculation formula of the automobile wheel power is:

[0091] P=F*v / 3600

[0092] Among them, P is the wheel power of the car, F is the traction of the whole vehicle, and v is the speed of the vehicle;

[0093] The calculation formula of the vehicle traction force is:

[0094] F=fr+fa+fl

[0095] Among them, F is the traction of the whole vehicle, fr is the rolling resistance, fa is the windward resistance (unit N), and fl is the slope resistance;

[0096] The calculation formula of the slope resistance is:

[0097] fl=mv*L / (mv*kr+10000) 1 / 2

[0098] Among them, fl is the slope resistance, L is the slope, mv is the maximum total mass of the vehicle, and kr is the rolling coefficient;

[0099] The calculation formula of the windward resistance is:

[0100] fa=(ka+Aa)*v 2 / 21.15*288.2 / (273.15+T)

[0101] Among them, fa is the headwind resistance, ka is the drag coefficient, Aa is the headwind area, v is the vehicle speed, and T is the ambient temperature;

[0102] The formula for calculating rolling resistance is:

[0103] fr=(mv+mt)*9.8*kr*100 / (L 2 +100 2 ) 1 / 2

[0104] Among them, fr is the rolling resistance, mv is the maximum total mass of the vehicle, mt is the mass of the trailer, kr is the rolling coefficient, and L is the slope.

[0105] After obtaining the engine power and engine speed, the engine torque is obtained according to the following formula:

[0106] Te=9550*Pe / n

[0107] Among them, Te is the engine working torque, Pe is the total engine power, and n is the engine speed.

[0108] By collecting all vehicle parameters of the target vehicle and then conducting a comprehensive evaluation based on various vehicle parameters, the engine power and engine speed of the vehicle development stage can be accurately calculated. The engine torque is then calculated based on the engine power and engine speed, so as to more realistically simulate the vehicle's operating state.

[0109] Step S03: constructing an initial three-dimensional model of the cooling system according to the heat load of the engine, and obtaining the water flow, pressure distribution, and vehicle water temperature distribution of each component of the cooling system according to the initial three-dimensional model of the cooling system;

[0110] It should be noted that the engine thermal load test is carried out according to the engine power, engine torque and engine speed simulation to obtain the thermal load data of the whole vehicle. The thermal load data is the heat released by the engine consuming fuel. Based on this data, the corresponding initial three-dimensional model of the cooling system is constructed.

[0111] Step S04: Evaluate the cooling performance of the water flow rate, pressure distribution of each component and the water temperature distribution of the whole vehicle according to the water temperature target and pressure target, and optimize the initial three-dimensional model of the cooling system according to the evaluation results to obtain the final three-dimensional model of the cooling system.

[0112] It can be understood that in order to further improve the matching degree between the cooling system and the engine, after obtaining data such as water flow, pressure distribution and vehicle water temperature distribution based on the initial three-dimensional model of the cooling system, these data are compared and evaluated with the water temperature target and pressure target set by the development project, so as to determine the characteristic data that does not meet the development goals based on the evaluation results, and optimize the corresponding cooling system components based on the characteristic data, so as to obtain the final three-dimensional model of the cooling system.

[0113] In summary, according to the above-mentioned performance evaluation method of the engine cooling system, a comprehensive and detailed matching development evaluation is conducted on the cooling performance of the engine cooling system to ensure that the matching development of the engine cooling system is more accurate and reasonable, which is conducive to reducing the development cost. Specifically, firstly, the vehicle parameters of the vehicle to be developed are obtained to obtain the relevant goals of the matching development of the cooling system, namely, the issuing working conditions, water temperature targets and pressure targets, etc., and then the engine speed, engine power and engine torque are calculated according to the development goals to start the engine thermal load test, so as to obtain the thermal load of the engine under the issuing working conditions, and then the initial three-dimensional model of the cooling system is preliminarily constructed according to the thermal load, and the water flow, pressure distribution, vehicle water temperature distribution and other parameters of each part are obtained in turn under the initial three-dimensional model, and then the water flow, pressure distribution and vehicle water temperature distribution are compared with the development goals, so as to optimize the initial model to obtain the final three-dimensional model of the cooling system, thereby completing the evaluation of the development stage, and by accurately calculating each parameter and optimizing the obtained model, it is ensured that the obtained final three-dimensional model has a high degree of matching with the engine, meets actual needs, and effectively reduces the development cost.

[0114] See also Figure 2 , which is a flow chart of a method for evaluating the performance of an engine cooling system in a second embodiment of the present invention, the method comprises steps S11 to S19, wherein:

[0115] Step S11: obtaining vehicle parameters of the target vehicle corresponding to this cooling system development project, and obtaining the vehicle thermal management issuing working condition, water temperature target and pressure target according to the vehicle parameters, wherein the issuing working condition includes driving parameters and thermal management parameters;

[0116] Step S12: Obtain the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and the thermal management parameters, and perform an engine thermal load test according to the engine speed, the engine power and the engine torque to obtain the thermal load of the engine under the corresponding vehicle operating condition.

[0117] Step S13: performing a vehicle simulation test according to the speed information, slope information, ambient temperature, gear position of the transmission, and trailer mass under the driving condition, and obtaining vehicle parameter information according to the test results;

[0118] It should be noted that the various data under driving conditions are determined according to the market positioning during project development. That is, during vehicle development, the speed information, slope information, adapted ambient temperature, transmission gear information, trailer mass, etc. under driving conditions can be located based on information such as the target vehicle model, the required power performance, and the applicable group. Then, a vehicle simulation test is carried out to obtain the vehicle parameter information. In this embodiment, the vehicle parameter information includes at least the relevant dimensional parameters of each component of the vehicle.

[0119] Step S14: constructing a three-dimensional model of the vehicle grille and a three-dimensional model of the vehicle cabin respectively according to the vehicle parameter information.

[0120] It can be understood that the three-dimensional model of the vehicle grille and the three-dimensional model of the vehicle cabin are respectively constructed according to the relevant size parameters of the various components of the vehicle. In this embodiment, the three-dimensional model of the vehicle grille and the three-dimensional model of the vehicle cabin are both constructed based on the 3D model assumptions of the evaluation system.

[0121] Step S15: setting the wind resistance performance and heat dissipation performance of the cooling system, and calculating the air volume parameters of various components of the cooling system according to the three-dimensional model of the vehicle grille and the three-dimensional model of the vehicle cabin, wherein the various components of the cooling system include the radiator, the condenser, the intercooler and the oil cooler;

[0122] In this step, the wind resistance performance and heat dissipation performance are data estimated by the evaluation system based on the development goals of this time, so as to effectively construct a three-dimensional model of the vehicle grille and the vehicle cabin, and obtain the air volume parameters of each component of the cooling system under the 3D hypothetical model.

[0123] Step S16: constructing an initial three-dimensional model of the cooling system according to the air volume parameters of each component of the cooling system and the heat load of the engine;

[0124] Step S17: acquiring characteristic parameters corresponding to the performance deficiency according to the evaluation results, and optimizing the initial three-dimensional model of the cooling system according to the performance evaluation data corresponding to the characteristic parameters and the evaluation target;

[0125] It should be noted that, in the actual evaluation process, if there are characteristic parameters with insufficient performance, the corresponding cooling system components will be optimized based on the characteristic parameters.

[0126] Step S18: Repeatedly test the water flow, pressure distribution and vehicle water temperature distribution of the optimized initial three-dimensional model of the cooling system until the evaluation result passes, and obtain the final three-dimensional model of the cooling system;

[0127] It should be noted that there may be multiple optimizations from the initial three-dimensional model of the cooling system to the final three-dimensional model of the cooling system. By continuously optimizing the components of the three-dimensional model of the cooling system, a cooling system that fully meets the requirements of the engine can be determined.

[0128] Step S19: acquiring the dimension parameters of each component of the cooling system according to the final three-dimensional model of the cooling system.

[0129] In this step, the final three-dimensional model of the cooling system is decomposed to obtain the size and performance requirements of each component of the cooling system.

[0130] According to the above-mentioned engine cooling system performance evaluation system, a comprehensive and detailed matching development evaluation is conducted on the cooling performance of the engine cooling system to ensure that the matching development of the engine cooling system is more accurate and reasonable, which is conducive to reducing the development cost. Specifically, the vehicle parameters of the vehicle to be developed are first obtained to obtain the relevant goals of this cooling system matching development, namely, the issuing working conditions, water temperature targets and pressure targets, and then the engine speed, engine power and engine torque are calculated according to the development goals to start the engine thermal load test, so as to obtain the thermal load of the engine under the issuing working conditions, and then the initial three-dimensional model of the cooling system is preliminarily constructed according to the thermal load, and the water flow, pressure distribution, vehicle water temperature distribution and other parameters of each part are obtained in turn under the initial three-dimensional model, and then the water flow, pressure distribution and vehicle water temperature distribution are compared with the development goals, so as to optimize the initial model to obtain the final three-dimensional model of the cooling system, thereby completing the evaluation of the development stage, and by accurately calculating each parameter and optimizing the obtained model, it is ensured that the obtained final three-dimensional model has a high degree of matching with the engine, meets actual needs, and effectively reduces the development cost.

[0131] See also Figure 3 , which is a performance evaluation system of an engine cooling system in a third embodiment of the present invention, and the performance evaluation system of the engine cooling system comprises:

[0132] The evaluation target acquisition module 10 is used to acquire vehicle parameters of the target vehicle corresponding to the cooling system development project, and acquire the vehicle thermal management issuance working condition, water temperature target and pressure target according to the vehicle parameters, wherein the issuance working condition includes driving parameters and thermal management parameters;

[0133] The thermal load calculation module 20 is used to obtain the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and the thermal management parameters, and to perform an engine thermal load test according to the engine speed, the engine power and the engine torque to obtain the thermal load of the engine under the corresponding vehicle working condition;

[0134] The model building module 30 is used to build an initial three-dimensional model of the cooling system according to the heat load of the engine, and obtain the water flow, pressure distribution and vehicle water temperature distribution of each component of the cooling system according to the initial three-dimensional model of the cooling system;

[0135] The model evaluation module 40 is used to evaluate the cooling performance of the water flow rate, pressure distribution of each component and the water temperature distribution of the whole vehicle according to the water temperature target and pressure target, and optimize the initial three-dimensional model of the cooling system according to the evaluation results to obtain the final three-dimensional model of the cooling system.

[0136] Furthermore, the model evaluation module 40 further includes:

[0137] A model optimization unit, used to obtain characteristic parameters corresponding to the performance deficiency according to the evaluation results, and optimize the initial three-dimensional model of the cooling system according to the performance evaluation data corresponding to the characteristic parameters and the evaluation target;

[0138] A repeated evaluation unit is used to repeatedly test the water flow, pressure distribution and vehicle water temperature distribution of the optimized initial three-dimensional model of the cooling system until the evaluation result is passed and the final three-dimensional model of the cooling system is obtained;

[0139] The dimension parameter acquisition unit is used to acquire the dimension parameters of each part of the cooling system according to the final three-dimensional model of the cooling system.

[0140] Furthermore, in some optional embodiments of the present invention, the performance evaluation system of the engine cooling system further includes:

[0141] The vehicle parameter acquisition module is used to perform a vehicle simulation test based on the speed information, slope information, ambient temperature, gear position of the transmission, and trailer mass under driving conditions, and obtain the vehicle parameter information based on the test results;

[0142] A vehicle model building module, used to build a three-dimensional model of the vehicle grille and a three-dimensional model of the vehicle cabin according to the vehicle parameter information;

[0143] Furthermore, in some optional embodiments of the present invention, the performance evaluation system of the engine cooling system further includes:

[0144] The air volume parameter calculation module is used to set the wind resistance performance and heat dissipation performance of the cooling system, and calculate the air volume parameters of various components of the cooling system based on the three-dimensional model of the vehicle grille and the three-dimensional model of the vehicle cabin. The various components of the cooling system include the radiator, condenser, intercooler and oil cooler.

[0145] Further, in some optional embodiments of the present invention, the engine speed is obtained according to the following formula:

[0146]

[0147] Among them: n is the engine speed (in rpm), v is the vehicle speed (in kph), kt is the gear ratio of the transmission, kf is the main reduction ratio, and Rt is the rolling radius of the driving wheel.

[0148] Further, in some optional embodiments of the present invention, the engine power is obtained according to the following formula:

[0149] Pe=Peo+Pa

[0150] Among them, Pe is the total engine power, Peo is the engine output power, and Pa is the engine accessory power;

[0151] The calculation formula of the engine output power is:

[0152] Peo=P / η

[0153] Among them, Peo is the engine output power, P is the vehicle wheel power, and η is the powertrain transmission efficiency;

[0154] The calculation formula of the powertrain transmission efficiency is:

[0155] η=ηt*ηT*ηf

[0156] Among them, η is the powertrain transmission efficiency, ηt is the gearbox transmission efficiency, ηT is the torque converter transmission efficiency, and ηf is the main reducer transmission efficiency;

[0157] The calculation formula of the automobile wheel power is:

[0158] P=F*v / 3600

[0159] Among them, P is the wheel power of the car, F is the traction of the whole vehicle, and v is the speed of the vehicle;

[0160] The calculation formula of the vehicle traction force is:

[0161] F=fr+fa+fl

[0162] Among them, F is the traction of the whole vehicle, fr is the rolling resistance, fa is the windward resistance (unit N), and fl is the slope resistance;

[0163] The calculation formula of the slope resistance is:

[0164] fl=mv*L / (mv*kr+10000) 1 / 2 Among them, fl is the slope resistance, L is the slope, mv is the maximum total mass of the vehicle, and kr is the rolling coefficient;

[0165] The calculation formula of the windward resistance is:

[0166] fa=(ka+Aa)*v 2 / 21.15*288.2 / (273.15+T)

[0167] Among them, fa is the headwind resistance, ka is the drag coefficient, Aa is the headwind area, v is the vehicle speed, and T is the ambient temperature;

[0168] The formula for calculating rolling resistance is:

[0169] fr=(mv+mt)*9.8*kr*100 / (L 2 +1002) 1 / 2

[0170] Among them, fr is the rolling resistance, mv is the maximum total mass of the vehicle, mt is the mass of the trailer, kr is the rolling coefficient, and L is the slope.

[0171] Further, in some optional embodiments of the present invention, the engine torque is obtained according to the following formula:

[0172] Te=9550*Pe / n

[0173] Among them, Te is the engine working torque, Pe is the total engine power, and n is the engine speed.

[0174] In summary, according to the above-mentioned engine cooling system performance evaluation system, a comprehensive and detailed matching development evaluation is conducted on the cooling performance of the engine cooling system to ensure that the matching development of the engine cooling system is more accurate and reasonable, which is conducive to reducing the development cost. Specifically, firstly, the vehicle parameters of the vehicle to be developed are obtained to obtain the relevant goals of this cooling system matching development, namely, the issuing working conditions, water temperature targets and pressure targets, and then the engine speed, engine power and engine torque are calculated according to the development goals to start the engine thermal load test, so as to obtain the thermal load of the engine under the issuing working conditions, and then the initial three-dimensional model of the cooling system is preliminarily constructed according to the thermal load, and the water flow, pressure distribution, vehicle water temperature distribution and other parameters of each part are obtained in turn under the initial three-dimensional model, and then the water flow, pressure distribution and vehicle water temperature distribution are compared with the development goals, so as to optimize the initial model to obtain the final three-dimensional model of the cooling system, thereby completing the evaluation of the development stage, and by accurately calculating each parameter and optimizing the obtained model, it is ensured that the obtained final three-dimensional model has a high degree of matching with the engine, meets actual needs, and effectively reduces the development cost.

[0175] Another aspect of the present invention further provides a computer storage medium having one or more programs stored thereon, which implement the above-mentioned engine cooling system performance evaluation method when executed by a processor.

[0176] Another aspect of the present invention further provides a vehicle, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory to implement the above-mentioned engine cooling system performance evaluation method.

[0177] Those skilled in the art will appreciate that the logic and / 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 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, "computer-readable 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.

[0178] More specific examples of computer-readable 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), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable 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, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0179] 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.

[0180] 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.

[0181] 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 evaluating the performance of an engine cooling system, characterized in that: The method comprises: Obtain vehicle parameters of the target vehicle corresponding to this cooling system development project, and obtain vehicle thermal management release working conditions, water temperature target and pressure target based on the vehicle parameters. The release working conditions include driving parameters and thermal management parameters. Acquiring an engine speed, an engine power, and an engine torque of a target vehicle according to the driving parameters and the thermal management parameters, and performing an engine thermal load test according to the engine speed, the engine power, and the engine torque to obtain a thermal load of the engine under a corresponding vehicle operating condition; Constructing an initial three-dimensional model of the cooling system according to the heat load of the engine, and obtaining the water flow, pressure distribution, and vehicle water temperature distribution of each component of the cooling system according to the initial three-dimensional model of the cooling system; The cooling performance of the water flow rate, pressure distribution of each component and the water temperature distribution of the whole vehicle is evaluated according to the water temperature target and the pressure target, and the initial three-dimensional model of the cooling system is optimized according to the evaluation results to obtain the final three-dimensional model of the cooling system.

2. The performance evaluation method of the engine cooling system according to claim 1, characterized in that: The driving parameters include speed information and slope information under the driving condition, the thermal management parameters include ambient temperature, gear position of a transmission, and trailer mass, and after the step of obtaining the engine speed, engine power, and engine torque of the target vehicle according to the driving parameters and thermal management parameters, and performing an engine thermal load test according to the engine speed, the engine power, and the engine torque to obtain the thermal load of the engine under the corresponding vehicle condition, the step further includes: Carry out vehicle simulation test according to speed information, slope information, ambient temperature, gear position of transmission, and trailer mass under driving conditions, and obtain vehicle parameter information according to the test results; A three-dimensional model of the vehicle grille and a three-dimensional model of the vehicle cabin are respectively constructed according to the vehicle parameter information.

3. The performance evaluation method of the engine cooling system according to claim 2, characterized in that: After the step of respectively establishing a three-dimensional model of the vehicle grille and a three-dimensional model of the vehicle cabin according to the vehicle parameter information, the following step further comprises: Set the wind resistance and heat dissipation performance of the cooling system, and calculate the air volume parameters of each component of the cooling system based on the three-dimensional model of the vehicle grille and the three-dimensional model of the vehicle cabin. The cooling system components include the radiator, condenser, intercooler and oil cooler; The initial three-dimensional model of the cooling system is constructed according to the air volume parameters of each component of the cooling system and the heat load of the engine.

4. The performance evaluation method of the engine cooling system according to claim 3, characterized in that: The step of evaluating the cooling performance of the water flow rate, pressure distribution of each component and the water temperature distribution of the whole vehicle according to the water temperature target and the pressure target, and optimizing the initial three-dimensional model of the cooling system according to the evaluation results to obtain the final three-dimensional model of the cooling system includes: Acquire characteristic parameters corresponding to the performance deficiency according to the evaluation results, and optimize the initial three-dimensional model of the cooling system according to the performance evaluation data corresponding to the characteristic parameters and the evaluation target; Repeat the test of the water flow, pressure distribution and vehicle water temperature distribution of the optimized initial 3D model of the cooling system until the evaluation result is passed and the final 3D model of the cooling system is obtained; The dimension parameters of each part of the cooling system are obtained according to the final three-dimensional model of the cooling system.

5. The performance evaluation method of an engine cooling system according to claim 1, characterized in that: The step of obtaining the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and the thermal management parameters comprises: The engine speed is obtained according to the following formula: Where: n is the engine speed in rpm, v is the vehicle speed in kph, kt is the gear ratio of the transmission, kf is the main reduction ratio, and Rt is the rolling radius of the drive wheel.

6. The performance evaluation method of an engine cooling system according to claim 1, characterized in that: The step of acquiring the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and the thermal management parameters also includes: The engine power is obtained according to the following formula: Pe=Peo+Pa Among them, Pe is the total engine power, Peo is the engine output power, and Pa is the engine accessory power; The calculation formula of the engine output power is: Peo=P / η Among them, Peo is the engine output power, P is the vehicle wheel power, and η is the powertrain transmission efficiency; The calculation formula of the powertrain transmission efficiency is: η=ηt*ηT*ηf Among them, η is the powertrain transmission efficiency, ηt is the gearbox transmission efficiency, ηT is the torque converter transmission efficiency, and ηf is the main reducer transmission efficiency; The calculation formula of the automobile wheel power is: P=F*v / 3600 Among them, P is the wheel power of the car, F is the traction of the whole vehicle, and v is the speed of the vehicle; The calculation formula of the vehicle traction force is: F=fr+fa+fl Among them, F is the traction of the whole vehicle, fr is the rolling resistance, fa is the windward resistance, and fl is the slope resistance, and the unit is N; The calculation formula of the slope resistance is: fl=mv*L / (mv*kr+10000) 1 / 2 Among them, fl is the slope resistance, L is the slope, mv is the maximum total mass of the vehicle, and kr is the rolling coefficient; The calculation formula of the windward resistance is: fa=(ka+Aa)*v 2 / 21.15*288.2 / (273.15+T) Among them, fa is the headwind resistance, ka is the drag coefficient, Aa is the headwind area, v is the vehicle speed, and T is the ambient temperature; The calculation formula of the rolling resistance is: fr=(mv+mt)*9.8*kr*100 / (L 2 +100 2 ) 1 / 2 Among them, fr is the rolling resistance, mv is the maximum total mass of the vehicle, mt is the mass of the trailer, kr is the rolling coefficient, and L is the slope.

7. The performance evaluation method of an engine cooling system according to claim 1, characterized in that: The step of acquiring the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and the thermal management parameters also includes: The engine torque is obtained according to the following formula: Te=9550*Pe / n Among them, Te is the engine working torque, Pe is the total engine power, and n is the engine speed.

8. A performance evaluation system for an engine cooling system, characterized in that: The performance evaluation system of the engine cooling system comprises: An evaluation target acquisition module is used to acquire vehicle parameters of the target vehicle corresponding to this cooling system development project, and acquire the vehicle thermal management issuance working condition, water temperature target and pressure target according to the vehicle parameters. The issuance working condition includes driving parameters and thermal management parameters. a thermal load calculation module, used for obtaining the engine speed, engine power and engine torque of the target vehicle according to the driving parameters and the thermal management parameters, and performing an engine thermal load test according to the engine speed, the engine power and the engine torque to obtain the thermal load of the engine under the corresponding vehicle working condition; A model building module is used to build an initial three-dimensional model of the cooling system according to the heat load of the engine, and obtain the water flow, pressure distribution and vehicle water temperature distribution of each component of the cooling system according to the initial three-dimensional model of the cooling system; The model evaluation module is used to evaluate the cooling performance of the water flow rate, pressure distribution of each component and the water temperature distribution of the whole vehicle according to the water temperature target and pressure target, and optimize the initial three-dimensional model of the cooling system according to the evaluation results to obtain the final three-dimensional model of the cooling system.

9. A storage medium, characterized in that: The storage medium stores one or more programs, which, when executed by a processor, implement the performance evaluation method for an engine cooling system as described in any one of claims 1 to 7.

10. 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 performance evaluation method of the engine cooling system described in any one of claims 1-7 is implemented.

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