CN114707232A - Performance evaluation method and system of engine cooling system, storage medium and vehicle - Google Patents
Performance evaluation method and system of engine cooling system, storage medium and vehicle Download PDFInfo
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Abstract
The invention provides a performance evaluation method and system of an engine cooling system, a storage medium and a vehicle, wherein the method comprises the following steps: acquiring a finished automobile heat management issuing working condition, a water temperature target and a pressure target according to vehicle parameters; carrying out an engine thermal load test according to the engine rotating speed, the engine power and the engine torque to obtain the thermal load of the engine under the working condition corresponding to the whole vehicle; and constructing an initial three-dimensional model of the cooling system according to the heat load of the engine, acquiring water flow, pressure distribution and water temperature distribution of the whole vehicle of all parts of the cooling system according to the initial three-dimensional model of the cooling system so as to evaluate the cooling performance, and optimizing the initial three-dimensional model of the cooling system according to an evaluation result so as to obtain a final three-dimensional model of the cooling system. The performance evaluation method of the engine cooling system provided by the invention can be used for comprehensively evaluating the cooling system before the cooling system is designed and continuously optimizing the evaluation result so as to enable the engine cooling system to achieve a better cooling effect.
Description
Technical Field
The invention relates to the technical field of evaluation of vehicle engine cooling systems, in particular to a performance evaluation method and system of an engine cooling system, a storage medium and a vehicle.
Background
The cooling system has the function of timely dissipating partial heat absorbed by heated parts, and ensuring that the engine works in an optimum temperature state. The cooling system of the engine is divided into wind cooling and water cooling. A cooling system using air as a cooling medium is called an air cooling system. A cooling system using a coolant as a cooling medium is called a water cooling system.
When the vehicle engine works, the temperature of gas in the cylinder can reach 1727-2527 ℃, if the gas is not cooled in time, the temperature of parts of the engine is too high, and particularly parts directly contacted with high-temperature gas influence normal fit clearance due to thermal expansion, so that moving parts are blocked or even blocked. In addition, the high temperature causes a decrease in mechanical strength of engine parts, rendering the lubricating oil useless, and the like. Therefore, a proper cooling system needs to be matched in the development stage of the whole vehicle engine so as to ensure that the engine has good heat dissipation performance.
In the prior art, the matching development process of the cooling system of the whole vehicle engine is designed after various parameters are roughly calculated by virtue of personal experience of engineers, so that the problem that the evaluation is incomplete easily exists in the development stage of the cooling system, the precision of the developed cooling system is low, the development cost is increased, and even the situation that the development cost is not in line with actual requirements is caused.
Disclosure of Invention
Based on this, the invention aims to provide a performance evaluation method, a system, a storage medium and a vehicle of an engine cooling system, so as to solve at least one of the problems.
According to the invention, the performance evaluation method of the engine cooling system comprises the following steps:
obtaining vehicle parameters of a target vehicle corresponding to a cooling system development project, and obtaining a finished vehicle heat management issuing working condition, a water temperature target and a pressure target according to the vehicle parameters, wherein the issuing working condition comprises a driving parameter and a heat management parameter;
obtaining the engine speed, the engine power and the engine torque of a target vehicle according to the running 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 working condition corresponding to the whole vehicle;
constructing an initial three-dimensional model of a cooling system according to the heat load of an engine, and acquiring the water flow, pressure distribution and finished vehicle water temperature distribution of each part of the cooling system according to the initial three-dimensional model of the cooling system;
and evaluating the cooling performance of the water flow and pressure distribution of each part 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 an evaluation result to obtain a final three-dimensional model of the cooling system.
In summary, according to the performance evaluation method of the engine cooling system, the cooling performance of the engine cooling system is comprehensively and specifically matched, developed and evaluated, so that the matching and development of the engine cooling system are more accurate and reasonable, and the development cost is reduced. The method comprises the steps of firstly obtaining vehicle parameters of a vehicle to be developed to obtain related targets of matching development of the cooling system, namely, a signing working condition, a water temperature target, a pressure target and the like, then calculating according to the development target to obtain the rotating speed of an engine, the power of the engine and the torque of the engine to start an engine heat load test to obtain the heat load of the engine under the signing working condition, then preliminarily constructing an initial three-dimensional model of the cooling system according to the heat load, sequentially obtaining parameters of water flow, pressure distribution, water temperature distribution of the whole vehicle and the like of each part under the initial three-dimensional model, then comparing the water flow, the pressure distribution and the water temperature distribution of the whole vehicle with the development target to optimize the initial model to obtain a final three-dimensional model of the cooling system, thereby completing the evaluation in the development stage, and accurately calculating each parameter, and the obtained model is optimized to ensure that the matching degree of the obtained final three-dimensional model and the engine is higher, the actual requirement is met, and the development cost is effectively reduced.
Further, the step of obtaining the engine speed, the engine power and the 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 working condition of the whole vehicle further includes:
carrying out a finished automobile simulation test according to speed information and gradient information under a running condition, ambient temperature, gear of a gearbox and trailer quality, and acquiring finished automobile parameter information according to a test result;
and respectively constructing a finished automobile grille three-dimensional model and a finished automobile cabin three-dimensional model according to the finished automobile parameter information.
Further, the step of respectively establishing a complete vehicle grille three-dimensional model and a complete vehicle cabin three-dimensional model according to the complete vehicle parameter information further comprises the following steps:
setting the wind resistance performance and the heat dissipation performance of the cooling system, and calculating according to a finished automobile grille three-dimensional model and a finished automobile cabin three-dimensional model to obtain air quantity parameters of all parts of the cooling system, wherein all parts of the cooling system comprise a radiator, a condenser, an intercooler and an oil cooler;
and constructing an initial three-dimensional model of the cooling system according to the air volume parameters of all parts of the cooling system and the heat load of the engine.
Further, the step of evaluating the cooling performance of the water flow, the pressure distribution and the vehicle water temperature distribution of each part 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 result to obtain the final three-dimensional model of the cooling system comprises:
obtaining characteristic parameters corresponding to the performance deficiency according to the evaluation result, and optimizing the initial three-dimensional model of the cooling system according to performance evaluation data corresponding to the characteristic parameters and an evaluation target;
repeatedly detecting the water flow, the pressure distribution and the water temperature distribution of the whole vehicle of the optimized initial three-dimensional model of the cooling system until the evaluation result passes, and obtaining a final three-dimensional model of the cooling system;
and acquiring the size parameters of each part of the cooling system according to the final three-dimensional model of the cooling system.
Further, the step of obtaining the engine speed, the engine power and the 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:
wherein: n is the engine speed (unit rpm), v is the vehicle speed (unit kph), kt is the transmission gear ratio, kf is the final reduction ratio, and Rt is the rolling radius of the driving wheels.
Further, the step of obtaining the engine speed, the engine power and the engine torque of the target vehicle according to the driving parameters and the thermal management parameters further comprises:
engine power is obtained according to the following equation:
Pe＝Peo+Pa
wherein Pe is total engine power, Peo is engine output power, and Pa is engine accessory power;
the operation formula of the output power of the engine is as follows:
Peo＝P/η
wherein, Peo is the output power of the engine, P is the power of the wheel edge of the automobile, and eta is the transmission efficiency of the power assembly; the calculation formula of the total transmission efficiency is as follows:
η＝ηt*ηT*ηf
wherein eta is the transmission efficiency of the power assembly, eta T is the transmission efficiency of the gearbox, eta T is the transmission efficiency of the torque converter at night, and eta f is the transmission efficiency of the main speed reducer;
the calculation formula of the automobile wheel side power is as follows:
P＝F*v/3600
wherein P is the wheel power of the automobile, F is the traction force of the whole automobile, and v is the speed;
the calculation formula of the traction force of the whole vehicle is as follows:
F＝fr+fa+fl
wherein F is the traction force of the whole vehicle, fr is rolling resistance, fa is windward resistance (unit N), and fl is gradient resistance;
the calculation formula of the gradient resistance is as follows:
fl＝mv*L/(mv*kr+10000)1/2
wherein fl is gradient resistance, L is gradient, mv is the maximum total mass of the whole vehicle, and kr is a rolling coefficient;
the formula for calculating the windward resistance is as follows:
fa＝(ka+Aa)*v2/21.15*288.2/(273.15+T)
wherein fa is windward resistance, ka is a wind resistance coefficient, Aa is windward area, v is vehicle speed, and T is ambient temperature;
fr＝(mv+mt)*9.8*kr*100/(L2+1002)1/2
wherein fr is rolling resistance, mv is the maximum total mass of the whole vehicle, mt is the mass of the trailer, kr is a rolling coefficient, and L is a gradient.
Further, the step of obtaining the engine speed, the engine power and the engine torque of the target vehicle according to the driving parameters and the thermal management parameters further comprises:
the engine torque is obtained according to the following equation:
Te＝9550*Pe/n
wherein Te is the working torque of the engine, Pe is the power of the engine, and n is the rotating speed of the engine.
According to an embodiment of the present invention, a performance evaluation system of an engine cooling system includes:
the system comprises an evaluation target acquisition module, a cooling system development project and a cooling system management module, wherein the evaluation target acquisition module is used for acquiring vehicle parameters of a target vehicle corresponding to the cooling system development project, and acquiring finished vehicle heat management issuing working condition, water temperature target and pressure target according to the vehicle parameters, and the issuing working condition comprises driving parameters and heat management parameters;
the heat load calculation module is used for acquiring the engine speed, the engine power and the engine torque of a target vehicle according to the running parameters and the heat management parameters, and performing an engine heat load test according to the engine speed, the engine power and the engine torque so as to obtain the heat load of the engine under the working condition corresponding to the whole vehicle;
the model building module is used for building an initial three-dimensional model of the cooling system according to the heat load of the engine and obtaining water flow, pressure distribution and water temperature distribution of the whole vehicle of each part of the cooling system according to the initial three-dimensional model of the cooling system;
and the model evaluation module is used for evaluating the cooling performance of the water flow and pressure distribution of each part 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 an evaluation result so as to obtain a final three-dimensional model of the cooling system.
Another aspect of the present invention also provides a storage medium storing one or more programs that, when executed, implement the performance evaluation method of the engine cooling system as described above.
Another aspect of the present invention also provides a vehicle comprising a memory and a processor, wherein:
the memory is used for storing computer programs;
the processor is used for implementing the performance evaluation method of the engine cooling system when executing the computer program stored in the memory.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flowchart of a method for evaluating the performance of an engine cooling system according to a first embodiment of the present invention;
FIG. 2 is a flowchart of a method for evaluating performance of an engine cooling system according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a performance evaluation system of an engine cooling system according to a third embodiment of the present invention.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a flowchart of a method for evaluating performance of an engine cooling system according to a first embodiment of the present invention is shown, the method including steps S01 to S04, wherein:
step S01: obtaining vehicle parameters of a target vehicle corresponding to a cooling system development project, and obtaining a finished vehicle heat management issuing working condition, a water temperature target and a pressure target according to the vehicle parameters, wherein the issuing working condition comprises a driving parameter and a heat management parameter;
it should be noted that the purpose of the development of the cooling system is to match with an engine in a complete vehicle development stage, in the process of the development of the matching of the cooling system, it is first necessary to determine relevant parameters of a target vehicle in the development of the project, where the target vehicle is a vehicle corresponding to an evaluation project, and in this embodiment, the vehicle parameters include, but are not limited to, a rolling radius of a tire, a rolling resistance coefficient, a maximum total mass of the complete vehicle, a final reduction ratio, a transmission gear ratio of a transmission case, a transmission efficiency of a final reducer, a transmission efficiency of a hydraulic torque converter, a wind resistance coefficient of the complete vehicle, a windward area, and accessory loads.
After various vehicle parameters are obtained, the aim of matching the cooling system with a development project at this time is determined according to the vehicle parameters, namely the cooling system with higher matching degree with the whole vehicle engine is developed, the situation that the actual requirements are not met is prevented, and meanwhile, the development rationality of the cooling system can be improved.
Step S02: obtaining the engine speed, the engine power and the engine torque of a target vehicle according to the running 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 working condition corresponding to the whole vehicle;
it can be understood that the driving parameters at least include speed information and gradient information under a driving condition, the thermal management parameters at least include ambient temperature, transmission gear and trailer mass, and then the engine power, the rotating speed and the torque of the target vehicle are accurately calculated according to the acquired data, specifically:
the engine speed is obtained according to the following formula:
wherein: n is the engine speed (unit rpm), v is the vehicle speed (unit kph), kt is the transmission gear ratio, kf is the final reduction ratio, and Rt is the rolling radius of the driving wheels.
Further, engine power is obtained according to the following equation:
Pe＝Peo+Pa
wherein Pe is total engine power, Peo is engine output power, and Pa is engine accessory power;
the operation formula of the output power of the engine is as follows:
Peo＝P/η
wherein Peo is the output power of the engine, P is the power of the wheel edge of the automobile, and eta is the transmission efficiency of the power assembly;
the calculation formula of the total transmission efficiency is as follows:
η＝ηt*ηT*ηf
wherein eta is the transmission efficiency of the power assembly, eta T is the transmission efficiency of the gearbox, eta T is the transmission efficiency of the torque converter at night, and eta f is the transmission efficiency of the main speed reducer;
the calculation formula of the automobile wheel side power is as follows:
P＝F*v/3600
wherein P is the wheel power of the automobile, F is the traction force of the whole automobile, and v is the speed;
the calculation formula of the traction force of the whole vehicle is as follows:
F＝fr+fa+fl
wherein F is the traction force of the whole vehicle, fr is rolling resistance, fa is windward resistance (unit N), and fl is gradient resistance;
the calculation formula of the gradient resistance is as follows:
fl＝mv*L/(mv*kr+10000)1/2
wherein fl is gradient resistance, L is gradient, mv is the maximum total mass of the whole vehicle, and kr is a rolling coefficient;
the formula for calculating the windward resistance is as follows:
fa＝(ka+Aa)*v2/21.15*288.2/(273.15+T)
wherein fa is windward resistance, ka is a wind resistance coefficient, Aa is windward area, v is vehicle speed, and T is ambient temperature;
fr＝(mv+mt)*9.8*kr*100/(L2+1002)1/2
wherein fr is rolling resistance, mv is the maximum total mass of the whole vehicle, mt is the mass of the trailer, kr is a rolling coefficient, and L is a gradient.
After engine power and engine speed are obtained, engine torque is obtained according to the following equation:
Te＝9550*Pe/n
wherein Te is the working torque of the engine, Pe is the power of the engine, and n is the rotating speed of the engine.
By collecting all vehicle parameters of a target vehicle and then carrying out comprehensive evaluation according to all vehicle parameters, the engine power and the engine rotating speed in the whole vehicle development stage are accurately calculated, and then the engine torque is calculated according to the engine power and the engine rotating speed, so that the running state of the vehicle can be simulated more truly.
Step S03: constructing an initial three-dimensional model of a cooling system according to the heat load of an engine, and acquiring the water flow, pressure distribution and finished vehicle water temperature distribution of each part of the cooling system according to the initial three-dimensional model of the cooling system;
the method includes the steps that an engine thermal load test is conducted according to engine power, engine torque and engine rotating speed simulation, thermal load data of the whole vehicle are obtained, the thermal load data are heat released by fuel consumed by the engine, and a corresponding cooling system initial three-dimensional model is built based on the data.
Step S04: and evaluating the cooling performance of the water flow and the pressure distribution of each part 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 an evaluation result to obtain a final three-dimensional model of the cooling system.
It can be understood that, in order to further improve the matching degree of the cooling system and the engine, after data such as water flow, pressure distribution, water temperature distribution of the whole vehicle and the like are obtained according to the initial three-dimensional model of the cooling system, the data are compared and evaluated with a water temperature target and a pressure target set by a development project, so that characteristic data which do not accord with the development target are determined according to an evaluation result, and corresponding cooling system parts are optimized according to the characteristic data, so that a final three-dimensional model of the cooling system is obtained.
In summary, according to the performance evaluation method of the engine cooling system, the cooling performance of the engine cooling system is comprehensively and specifically matched, developed and evaluated, so that the matching and development of the engine cooling system are more accurate and reasonable, and the development cost is reduced. The method comprises the steps of firstly obtaining vehicle parameters of a vehicle to be developed to obtain related targets of matching development of the cooling system, namely, a signing working condition, a water temperature target, a pressure target and the like, then calculating according to the development target to obtain the rotating speed of an engine, the power of the engine and the torque of the engine to start an engine heat load test to obtain the heat load of the engine under the signing working condition, then preliminarily constructing an initial three-dimensional model of the cooling system according to the heat load, sequentially obtaining parameters of water flow, pressure distribution, water temperature distribution of the whole vehicle and the like of each part under the initial three-dimensional model, then comparing the water flow, the pressure distribution and the water temperature distribution of the whole vehicle with the development target to optimize the initial model to obtain a final three-dimensional model of the cooling system, thereby completing the evaluation in the development stage, and accurately calculating each parameter, and the obtained model is optimized to ensure that the matching degree of the obtained final three-dimensional model and the engine is higher, the actual requirement is met, and the development cost is effectively reduced.
Referring to fig. 2, a flowchart of a method for evaluating performance of an engine cooling system according to a second embodiment of the present invention is shown, the method includes steps S11 to S19, wherein:
step S11: obtaining vehicle parameters of a target vehicle corresponding to a cooling system development project, and obtaining a finished vehicle heat management issuing working condition, a water temperature target and a pressure target according to the vehicle parameters, wherein the issuing working condition comprises a driving parameter and a heat management parameter;
step S12: and obtaining the engine speed, the engine power and the engine torque of the target vehicle according to the running 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 working condition corresponding to the whole vehicle.
Step S13: carrying out a finished automobile simulation test according to speed information and gradient information under a running condition, ambient temperature, gear of a gearbox and trailer quality, and acquiring finished automobile parameter information according to a test result;
it should be noted that each item of data under the driving condition is determined according to market positioning during project development, that is, during vehicle development, speed information, gradient information, adaptive environment temperature, gearbox gear information, trailer quality and the like under the driving condition can be positioned according to information such as a vehicle type of a target vehicle, required power performance, applicable groups and the like, and then a vehicle simulation test is performed, so that vehicle parameter information is obtained.
Step S14: and respectively constructing a finished automobile grille three-dimensional model and a finished automobile cabin three-dimensional model according to the finished automobile parameter information.
It can be understood that the whole vehicle grating three-dimensional model and the whole vehicle cabin three-dimensional model are respectively constructed according to relevant dimension parameters of each part of the whole vehicle, and in the embodiment, the constructed whole vehicle grating three-dimensional model and the constructed whole vehicle cabin three-dimensional model are 3D model hypotheses constructed by an evaluation system.
Step S15: setting the wind resistance performance and the heat dissipation performance of the cooling system, and calculating according to a finished automobile grille three-dimensional model and a finished automobile cabin three-dimensional model to obtain air quantity parameters of all parts of the cooling system, wherein all parts of the cooling system comprise a radiator, a condenser, an intercooler and an oil cooler;
in the step, the wind resistance performance and the heat dissipation performance are estimated data by the evaluation system according to the development target, so that a three-dimensional model of a whole vehicle grid whole vehicle cabin is effectively constructed, and air volume parameters of all components of the cooling system are obtained under the 3D hypothesis model.
Step S16: constructing an initial three-dimensional model of the cooling system according to the air volume parameters of all parts of the cooling system and the heat load of the engine;
step S17: obtaining characteristic parameters corresponding to the performance deficiency according to the evaluation result, and optimizing the initial three-dimensional model of the cooling system according to performance evaluation data corresponding to the characteristic parameters and an evaluation target;
in the actual evaluation process, if there is a characteristic parameter with poor performance, the corresponding cooling system component is optimized according to the characteristic parameter.
Step S18: repeatedly detecting the water flow, the pressure distribution and the water temperature distribution of the whole vehicle of the optimized initial three-dimensional model of the cooling system until the evaluation result passes, and obtaining a final three-dimensional model of the cooling system;
it should be noted that there may be a plurality of optimizations from the initial three-dimensional model of the cooling system to the final three-dimensional model of the cooling system, and the cooling system that completely conforms to the engine usage can be determined by continuously optimizing the components of the three-dimensional model of the cooling system.
Step S19: and acquiring the size parameters of each part of the cooling system according to the final three-dimensional model of the cooling system.
In this step, the final three-dimensional model of the cooling system is decomposed to obtain the dimensions and performance requirements of each part of the cooling system.
According to the performance evaluation system of the engine cooling system, the cooling performance of the engine cooling system is comprehensively and specifically matched, developed and evaluated, so that the matching development of the engine cooling system is more accurate and reasonable, and the development cost is reduced. The method comprises the steps of firstly obtaining vehicle parameters of a vehicle to be developed to obtain related targets of matching development of the cooling system, namely, a signing working condition, a water temperature target, a pressure target and the like, then calculating according to the development target to obtain the rotating speed of an engine, the power of the engine and the torque of the engine to start an engine heat load test to obtain the heat load of the engine under the signing working condition, then preliminarily constructing an initial three-dimensional model of the cooling system according to the heat load, sequentially obtaining parameters of water flow, pressure distribution, water temperature distribution of the whole vehicle and the like of each part under the initial three-dimensional model, then comparing the water flow, the pressure distribution and the water temperature distribution of the whole vehicle with the development target to optimize the initial model to obtain a final three-dimensional model of the cooling system, thereby completing the evaluation in the development stage, and accurately calculating each parameter, and the obtained model is optimized to ensure that the matching degree of the obtained final three-dimensional model and the engine is higher, the actual requirement is met, and the development cost is effectively reduced.
Referring to fig. 3, a performance evaluation system of an engine cooling system according to a third embodiment of the present invention is shown, the performance evaluation system of the engine cooling system including:
the system comprises an evaluation target acquisition module 10, a cooling system development project and a cooling system management module, wherein the evaluation target acquisition module is used for acquiring vehicle parameters of a target vehicle corresponding to the cooling system development project, and acquiring finished vehicle heat management issuing working condition conditions, a water temperature target and a pressure target according to the vehicle parameters, and the issuing working condition conditions comprise driving parameters and heat management parameters;
the thermal load calculation module 20 is configured to obtain an engine speed, an engine power, and an 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 a thermal load of the engine under a working condition corresponding to the entire vehicle;
the model building module 30 is used for building an initial three-dimensional model of the cooling system according to the heat load of the engine and obtaining the water flow, the pressure distribution and the water temperature distribution of the whole vehicle of all parts of the cooling system according to the initial three-dimensional model of the cooling system;
and the model evaluation module 40 is used for evaluating the cooling performance of the water flow, the pressure distribution and the whole vehicle water temperature distribution of each part according to the water temperature target and the pressure target, and optimizing the initial three-dimensional model of the cooling system according to an evaluation result to obtain a final three-dimensional model of the cooling system.
Further, the model evaluation module 40 also includes:
the model optimization unit is used for acquiring characteristic parameters corresponding to the performance deficiency according to the evaluation result 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;
the repeated evaluation unit is used for repeatedly detecting the water flow, the pressure distribution and the whole vehicle water temperature distribution of the optimized initial three-dimensional model of the cooling system until an evaluation result passes to obtain a final three-dimensional model of the cooling system;
and the size parameter acquisition unit is used for acquiring the size parameters of all parts of the cooling system according to the final three-dimensional model of the cooling system.
Further, in some optional embodiments of the present invention, the performance evaluation system of the engine cooling system further comprises:
the whole vehicle parameter acquisition module is used for carrying out a whole vehicle simulation test according to speed information and gradient information under a running working condition, ambient temperature, gear of a gearbox and trailer quality, and acquiring the parameter information of the whole vehicle according to a test result;
the whole vehicle model building module is used for respectively building a whole vehicle grille three-dimensional model and a whole vehicle cabin three-dimensional model according to the whole vehicle parameter information;
further, in some optional embodiments of the present invention, the performance evaluation system of the engine cooling system further comprises:
and the air quantity parameter calculation module is used for setting the air resistance performance and the heat dissipation performance of the cooling system, and calculating to obtain air quantity parameters of all parts of the cooling system according to the whole vehicle grille three-dimensional model and the whole vehicle cabin three-dimensional model, wherein all parts of the cooling system comprise a radiator, a condenser, an intercooler and an oil cooler.
Further, in some alternative embodiments of the present invention, the engine speed is obtained according to the following formula:
wherein: n is the engine speed (unit rpm), v is the vehicle speed (unit kph), kt is the transmission speed ratio, kf is the main reduction ratio, and Rt is the rolling radius of the driving wheel.
Further, in some alternative embodiments of the present invention, the engine power is derived according to the following equation:
Pe＝Peo+Pa
wherein Pe is total engine power, Peo is engine output power, and Pa is engine accessory power;
the operation formula of the output power of the engine is as follows:
Peo＝P/η
wherein, Peo is the output power of the engine, P is the power of the wheel edge of the automobile, and eta is the transmission efficiency of the power assembly;
the calculation formula of the total transmission efficiency is as follows:
η＝ηt*ηT*ηf
wherein eta is the transmission efficiency of the power assembly, eta T is the transmission efficiency of the gearbox, eta T is the transmission efficiency of the torque converter at night, and eta f is the transmission efficiency of the main speed reducer;
the calculation formula of the automobile wheel side power is as follows:
P＝F*v/3600
wherein P is the wheel power of the automobile, F is the traction force of the whole automobile, and v is the speed;
the calculation formula of the traction force of the whole vehicle is as follows:
F＝fr+fa+fl
wherein F is the traction force of the whole vehicle, fr is rolling resistance, fa is windward resistance (unit N), and fl is gradient resistance;
the gradient resistance is calculated by the following formula:
fl＝mv*L/(mv*kr+10000)1/2
wherein fl is gradient resistance, L is gradient, mv is the maximum total mass of the whole vehicle, and kr is a rolling coefficient;
the formula for calculating the windward resistance is as follows:
fa＝(ka+Aa)*v2/21.15*288.2/(273.15+T)
wherein fa is windward resistance, ka is a wind resistance coefficient, Aa is windward area, v is vehicle speed, and T is ambient temperature;
fr＝(mv+mt)*9.8*kr*100/(L+1002)1/2
wherein fr is rolling resistance, mv is the maximum total mass of the whole vehicle, mt is the mass of the trailer, kr is a rolling coefficient, and L is a gradient.
Further, in some alternative embodiments of the present invention, the engine torque is obtained according to the following equation:
Te＝9550*Pe/n
wherein Te is the working torque of the engine, Pe is the power of the engine, and n is the rotating speed of the engine.
In summary, according to the performance evaluation system of the engine cooling system, the cooling performance of the engine cooling system is comprehensively and specifically matched, developed and evaluated, so that the matching and development of the engine cooling system are more accurate and reasonable, and the development cost is reduced. The method comprises the steps of firstly obtaining vehicle parameters of a vehicle to be developed to obtain related targets of matching development of the cooling system, namely, a signing working condition, a water temperature target, a pressure target and the like, then calculating according to the development target to obtain the rotating speed of an engine, the power of the engine and the torque of the engine to start an engine heat load test to obtain the heat load of the engine under the signing working condition, then preliminarily constructing an initial three-dimensional model of the cooling system according to the heat load, sequentially obtaining parameters of water flow, pressure distribution, water temperature distribution of the whole vehicle and the like of each part under the initial three-dimensional model, then comparing the water flow, the pressure distribution and the water temperature distribution of the whole vehicle with the development target to optimize the initial model to obtain a final three-dimensional model of the cooling system, thereby completing the evaluation in the development stage, and accurately calculating each parameter, and the obtained model is optimized to ensure that the matching degree of the obtained final three-dimensional model and the engine is higher, the actual requirement is met, and the development cost is effectively reduced.
In another aspect, the present invention further provides a computer storage medium, which stores one or more programs that, when executed by a processor, implement the performance evaluation method of the engine cooling system described above.
In another aspect, the present invention further provides a vehicle, which includes a memory for storing a computer program and a processor for executing the computer program stored in the memory, so as to implement the performance evaluation method of the engine cooling system.
Those of skill in the art will understand that the logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be viewed as implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. A method of evaluating performance of an engine cooling system, the method comprising:
obtaining vehicle parameters of a target vehicle corresponding to a cooling system development project, and obtaining a finished vehicle heat management issuing working condition, a water temperature target and a pressure target according to the vehicle parameters, wherein the issuing working condition comprises a driving parameter and a heat management parameter;
obtaining the engine speed, the engine power and the engine torque of a target vehicle according to the running 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 working condition corresponding to the whole vehicle;
constructing an initial three-dimensional model of a cooling system according to the heat load of an engine, and acquiring the water flow, pressure distribution and finished vehicle water temperature distribution of each part of the cooling system according to the initial three-dimensional model of the cooling system;
and evaluating the cooling performance of the water flow and the pressure distribution of each part 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 an evaluation result to obtain a final three-dimensional model of the cooling system.
2. The method for evaluating the performance of the engine cooling system according to claim 1, wherein the driving parameters comprise speed information and gradient information under a driving condition, the thermal management parameters comprise ambient temperature, gear position of a gearbox and trailer mass, and the step of obtaining the engine speed, the engine power and the 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 the thermal load of the engine under a vehicle working condition further comprises the following steps:
carrying out a finished automobile simulation test according to speed information and gradient information under a running condition, ambient temperature, gear of a gearbox and trailer quality, and acquiring finished automobile parameter information according to a test result;
and respectively constructing a finished automobile grille three-dimensional model and a finished automobile cabin three-dimensional model according to the finished automobile parameter information.
3. The method for evaluating the performance of the engine cooling system according to claim 2, wherein the step of establishing a complete vehicle grille three-dimensional model and a complete vehicle cabin three-dimensional model respectively according to the complete vehicle parameter information further comprises:
setting the wind resistance performance and the heat dissipation performance of the cooling system, and calculating according to a finished automobile grille three-dimensional model and a finished automobile cabin three-dimensional model to obtain air quantity parameters of all parts of the cooling system, wherein all parts of the cooling system comprise a radiator, a condenser, an intercooler and an oil cooler;
and constructing an initial three-dimensional model of the cooling system according to the air quantity parameters of all parts 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, wherein the step of evaluating the cooling performance of the water flow, the pressure distribution and the vehicle water temperature distribution of each component 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 result to obtain the final three-dimensional model of the cooling system comprises:
obtaining characteristic parameters corresponding to the performance deficiency according to the evaluation result, and optimizing the initial three-dimensional model of the cooling system according to performance evaluation data corresponding to the characteristic parameters and an evaluation target;
repeatedly detecting the water flow, the pressure distribution and the water temperature distribution of the whole vehicle of the optimized initial three-dimensional model of the cooling system until the evaluation result passes, and obtaining a final three-dimensional model of the cooling system;
and acquiring the size parameters of each part of the cooling system according to the final three-dimensional model of the cooling system.
5. The performance evaluation method of the engine cooling system according to claim 1, wherein the step of obtaining the engine speed, the engine power, and the engine torque of the target vehicle from the running parameter and the thermal management parameter includes:
the engine speed is obtained according to the following formula:
wherein: n is the engine speed (unit rpm), v is the vehicle speed (unit kph), kt is the transmission gear ratio, kf is the final reduction ratio, and Rt is the rolling radius of the driving wheels.
6. The performance evaluation method of the engine cooling system according to claim 1, wherein the step of obtaining the engine speed, the engine power, and the engine torque of the target vehicle from the running parameter and the thermal management parameter further comprises:
engine power is obtained according to the following equation:
Pe＝Peo+Pa
wherein Pe is the total power of the engine, Peo is the output power of the engine, and Pa is the power of accessories of the engine;
the operation formula of the output power of the engine is as follows:
Peo＝P/η
wherein Peo is the output power of the engine, P is the power of the wheel edge of the automobile, and eta is the transmission efficiency of the power assembly;
the calculation formula of the total transmission efficiency is as follows:
η＝ηt*ηT*ηf
wherein eta is the transmission efficiency of the power assembly, eta T is the transmission efficiency of the gearbox, eta T is the transmission efficiency of the torque converter at night, and eta f is the transmission efficiency of the main speed reducer;
the calculation formula of the automobile wheel side power is as follows:
P＝F*v/3600
wherein P is the wheel power of the automobile, F is the traction force of the whole automobile, and v is the speed;
the calculation formula of the traction force of the whole vehicle is as follows:
F＝fr+fa+fl
wherein F is the traction force of the whole vehicle, fr is rolling resistance, fa is windward resistance (unit N), and fl is gradient resistance;
the calculation formula of the gradient resistance is as follows:
fl＝mv*L/(mv*kr+10000)1/2
wherein fl is gradient resistance, L is gradient, mv is the maximum total mass of the whole vehicle, and kr is a rolling coefficient;
the formula for calculating the windward resistance is as follows:
fa＝(ka+Aa)*v2/21.15*288.2/(273.15+T)
wherein fa is windward resistance, ka is a wind resistance coefficient, Aa is windward area, v is vehicle speed, and T is ambient temperature;
fr＝(mv+mt)*9.8*kr*100/(L2+1002)1/2
wherein fr is rolling resistance, mv is the maximum total mass of the whole vehicle, mt is the mass of the trailer, kr is a rolling coefficient, and L is a gradient.
7. The performance evaluation method of the engine cooling system according to claim 1, wherein the step of obtaining the engine speed, the engine power, and the engine torque of the target vehicle from the running parameter and the thermal management parameter further comprises:
the engine torque is obtained according to the following equation:
Te＝9550*Pe/n
wherein Te is the working torque of the engine, Pe is the power of the engine, and n is the rotating speed of the engine.
8. A performance evaluation system of an engine cooling system, characterized by comprising:
the system comprises an evaluation target acquisition module, a cooling system development project and a cooling system management module, wherein the evaluation target acquisition module is used for acquiring vehicle parameters of a target vehicle corresponding to the cooling system development project, and acquiring finished vehicle heat management issuing working condition, water temperature target and pressure target according to the vehicle parameters, and the issuing working condition comprises driving parameters and heat management parameters;
the heat load calculation module is used for acquiring the engine speed, the engine power and the engine torque of a target vehicle according to the running parameters and the heat management parameters, and performing an engine heat load test according to the engine speed, the engine power and the engine torque so as to obtain the heat load of the engine under the working condition corresponding to the whole vehicle;
the model building module is used for building an initial three-dimensional model of the cooling system according to the heat load of the engine and obtaining water flow, pressure distribution and water temperature distribution of the whole vehicle of each part of the cooling system according to the initial three-dimensional model of the cooling system;
and the model evaluation module is used for evaluating the cooling performance of the water flow and pressure distribution of each part 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 an evaluation result so as to obtain a final three-dimensional model of the cooling system.
9. A storage medium characterized in that it stores one or more programs which, when executed by a processor, implement a performance evaluation method of an engine cooling system according to any one of claims 1 to 7.
10. A vehicle, comprising a memory and a processor, wherein:
the memory is used for storing computer programs;
the processor is configured to implement the performance evaluation method of the engine cooling system according to any one of claims 1 to 7 when executing the computer program stored in the memory.
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| CN116007930A (en) * | 2023-03-28 | 2023-04-25 | 苏州众源测试技术有限公司 | Method and system for testing transmission performance of automobile |
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| CN116007930A (en) * | 2023-03-28 | 2023-04-25 | 苏州众源测试技术有限公司 | Method and system for testing transmission performance of automobile |
| CN116007930B (en) * | 2023-03-28 | 2023-07-14 | 苏州众源测试技术有限公司 | Method and system for testing transmission performance of automobile |
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