A method, device and system for optimizing variable resistance test of automobile

Abstract

The present invention proposes a method, device and system for optimizing a variable resistance test of an automobile. The method comprises: establishing an expert experience database and an air resistance coefficient database; obtaining the vehicle model, vehicle speed and opening of an active air intake grille of a to-be-tested automobile in real time, and determining the corresponding air resistance coefficient of the to-be-tested automobile at the current opening of the active air intake grille according to the vehicle model, the opening of the active air intake grille and the air resistance coefficient database; determining the corresponding wind resistance according to the vehicle speed of the to-be-tested automobile and the corresponding air resistance coefficient at the current opening of the active air intake grille; determining the resistance loaded by a chassis dynamometer according to the corresponding wind resistance of the to-be-tested automobile and the expert experience database, and realizing real-time correction of the resistance of the entire vehicle at different openings of the active air intake grille by a chassis dynamometer bench, thereby effectively improving the accuracy and reliability of the variable resistance test of the automobile.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile testing, and in particular to an automobile variable resistance test optimization method, device and system. Background Art

[0002] As an effective measure to reduce the air resistance of the vehicle, the active grille shutter (AGS) has been widely used. Closing the AGS can reduce the external airflow entering the front cabin, thereby reducing the pressure difference resistance during the vehicle's driving and reducing the energy loss of the vehicle caused by air resistance.

[0003] At present, chassis dynamometers are widely used in automobile tests, such as energy consumption, driving range, emissions and other vehicle economy tests. Before the vehicle economy test, the drag coefficient of the vehicle under test needs to be set on the chassis dynamometer to simulate its driving resistance on the road. The chassis dynamometer sets the drag coefficient of the vehicle under test based on the vehicle's road sliding resistance coefficient and obtains it by sliding on the chassis dynamometer. When the vehicle is sliding on the road, there are corresponding national standards for the vehicle status. For vehicles equipped with active air intake grilles, when sliding on the road, the active air intake grille is at a fixed opening with the minimum wind resistance. However, during the actual driving process of the user, the vehicle will adjust the opening of the active air intake grille in real time according to vehicle strategies such as vehicle speed and heat dissipation requirements.

[0004] Therefore, the vehicle resistance generated by road sliding with a fixed opening of the active air intake grille cannot truly reflect the user's actual energy consumption when used in the vehicle economy test on the chassis dynamometer. The test result is only the optimal state result, which makes the accuracy and reliability of the vehicle's variable resistance test low.

[0005] In view of this problem, the present invention provides a method, device and system for optimizing a variable resistance test of an automobile to solve the above problem. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention innovatively proposes a method, device and system for optimizing the variable resistance test of an automobile, which effectively solves the problems of low accuracy and reliability of the variable resistance test of an automobile caused by the prior art, and effectively improves the accuracy and reliability of the variable resistance test of an automobile.

[0007] A first aspect of the present invention provides a method for optimizing a variable resistance test of an automobile, comprising:

[0008] Establishing an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the corresponding influencing factors of different vehicle models under different working conditions, and the influencing factors are used to describe the influence of wind resistance on the resistance of the entire vehicle; the air resistance coefficient database stores the corresponding air resistance coefficients of different vehicle models under different active air intake grille opening conditions;

[0009] The vehicle model, vehicle speed and opening of the active air intake grille of the vehicle to be tested are obtained in real time, and the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested is determined according to the vehicle model, opening of the active air intake grille and air resistance coefficient database;

[0010] Determine the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current opening of the active air intake grille;

[0011] The resistance loaded on the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, so that the chassis dynamometer bench can modify the vehicle resistance at different openings of the active air intake grille in real time.

[0012] Optionally, the operating conditions include vehicle speed and test environment conditions, and the test environment conditions include the temperature of the environment of the vehicle to be tested and the humidity of the environment of the vehicle to be tested.

[0013] Optionally, before determining the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current active air intake grille opening, the method further includes:

[0014] Obtain the air density ρ and the windward area of ​​the vehicle to be tested in the test environment.

[0015] Furthermore, the determining of the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current active air intake grille opening specifically includes:

[0016] The air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening are input into the CFD simulation software to calculate the corresponding wind resistance of the vehicle to be tested.

[0017] Furthermore, the calculation of the wind resistance corresponding to the vehicle to be tested is specifically as follows:

[0018] F w =0.5ρ×C D ×A×v 2 ,

[0019] Among them, F w is the wind resistance corresponding to the vehicle to be tested, ρ is the air density in the test environment of the vehicle to be tested; C Dis the air resistance coefficient corresponding to the current active air intake grille opening of the vehicle model to be tested; A is the frontal area of ​​the vehicle corresponding to the vehicle model to be tested; v is the speed of the vehicle to be tested.

[0020] Optionally, the determining of the resistance loaded by the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and the real-time modification of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer bench specifically include:

[0021] Determine the resistance loaded on the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and send the resistance data determined on the chassis dynamometer to the chassis dynamometer control device;

[0022] The chassis dynamometer control equipment adjusts and controls the loading resistance of the chassis dynamometer in real time according to the resistance data of the chassis dynamometer loading, and adjusts and sets the chassis dynamometer loading resistance curve in real time, so as to realize the real-time correction of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer bench.

[0023] A second aspect of the present invention provides a vehicle variable resistance test optimization device, comprising:

[0024] Establishing a module, establishing an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the corresponding influencing factors of different vehicle models under different working conditions, and the influencing factors are used to describe the influence of wind resistance on the resistance of the entire vehicle; the air resistance coefficient database stores the corresponding air resistance coefficients of different vehicle models under different active air intake grille opening conditions;

[0025] The first acquisition module acquires the model, speed and opening of the active air intake grille of the vehicle to be tested in real time, and determines the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested according to the model, opening of the active air intake grille and air resistance coefficient database of the vehicle to be tested;

[0026] The first determination module determines the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient under the current opening of the active air intake grille;

[0027] The second determination module determines the resistance loaded on the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, so as to realize the real-time modification of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer.

[0028] Optionally, the variable resistance test optimization device for an automobile further includes:

[0029] The second acquisition module acquires the air density ρ and the windward area of ​​the vehicle to be tested in the test environment of the vehicle to be tested.

[0030] Further, in the first determination module, determining the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current active air intake grille opening specifically includes:

[0031] The air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening are input into the CFD simulation software to calculate the corresponding wind resistance of the vehicle to be tested.

[0032] The third aspect of the present invention provides a variable resistance test optimization system for an automobile, comprising: a chassis dynamometer, a data acquisition device, a data processing system, and a chassis dynamometer control device, wherein the data acquisition device is used to obtain the model, speed, and opening of the active air intake grille of the automobile to be tested in real time, and the model, speed, and opening of the active air intake grille of the automobile to be tested are obtained in real time and sent to the data processing system; the data processing system is used to establish an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the influence factors corresponding to different models under different working conditions, and the influence factors are used to describe the influence of wind resistance on the resistance of the entire automobile; the air resistance coefficient database stores the air resistance coefficients corresponding to different models under different active air intake grille opening conditions; And according to the model of the vehicle to be tested, the opening of the active air intake grille, and the air resistance coefficient database, the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested is determined; the corresponding wind resistance is determined according to the speed of the vehicle to be tested and the air resistance coefficient corresponding to the current opening of the active air intake grille; the resistance loaded by the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and the resistance data determined by the chassis dynamometer loading is sent to the chassis dynamometer control device; the chassis dynamometer control device is used to adjust and control the loading resistance of the chassis dynamometer in real time according to the resistance data determined by the chassis dynamometer loading, and adjust and set the chassis dynamometer loading resistance curve in real time, so as to realize the real-time correction of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer bench.

[0033] The technical solution adopted by the present invention includes the following technical effects:

[0034] 1. In the technical solution of the present invention, an expert experience database and an air resistance coefficient database are established; the model, speed and opening of the active air intake grille of the vehicle to be tested are obtained in real time, and the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested is determined according to the model, opening of the active air intake grille and the air resistance coefficient database of the vehicle to be tested; the corresponding wind resistance is determined according to the speed of the vehicle to be tested and the corresponding air resistance coefficient under the current opening of the active air intake grille; the resistance loaded by the chassis dynamometer is determined according to the corresponding wind resistance of the vehicle to be tested and the expert experience database, so that the chassis dynamometer bench can modify the resistance of the whole vehicle at different openings of the active air intake grille in real time, effectively solving the problem of low accuracy and reliability of the variable resistance test of the vehicle caused by the prior art, and effectively improving the accuracy and reliability of the variable resistance test of the vehicle.

[0035] 2. The expert experience database in the technical solution of the present invention stores the influencing factors corresponding to different vehicle models under different working conditions. The working conditions include vehicle speed and test environment conditions. The test environment conditions include the temperature of the environment of the vehicle to be tested and the humidity of the environment of the vehicle to be tested, which expands the application scope of the variable resistance test of the vehicle and makes the variable resistance test results of the vehicle more accurate.

[0036] 3. In the technical solution of the present invention, the wind resistance corresponding to the vehicle to be tested is calculated according to the air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening. Not only the environmental conditions of different vehicles to be tested, but also the model factors of the vehicle to be tested are taken into account, so that the calculation result of the wind resistance corresponding to the vehicle to be tested is more accurate, thereby ensuring the accuracy of the variable resistance test result of the vehicle.

[0037] 4. In the technical solution of the present invention, the resistance loaded by the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and the resistance data determined by the chassis dynamometer are sent to the chassis dynamometer control device; the chassis dynamometer control device adjusts and controls the loading resistance of the chassis dynamometer in real time according to the resistance data determined by the chassis dynamometer, and adjusts and sets the chassis dynamometer loading resistance curve in real time, so as to realize the real-time modification of the vehicle resistance of the chassis dynamometer bench under different openings of the active air intake grille (which can be adjusted in real time according to the speed and heat dissipation requirements of the vehicle to be tested), thereby ensuring the accuracy and reliability of the variable resistance test results of the vehicle.

[0038] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of a process of a method in Embodiment 1 of the present invention;

[0041] Figure 2 Another schematic diagram of the process of the method of Embodiment 1 in the scheme of the present invention;

[0042] Figure 3 It is a structural schematic diagram of a device in Example 2 of the solution of the present invention;

[0043] Figure 4 Another structural schematic diagram of the device of Example 2 in the scheme of the present invention;

[0044] Figure 5 This is a schematic diagram of the structure of the system in Embodiment 3 of the present invention;

[0045] Figure 6 This is a schematic diagram of the process of the system of Example 3 in the solution of the present invention. DETAILED DESCRIPTION

[0046] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily drawn to scale. The present invention omits the description of known components and processing techniques and processes to avoid unnecessary limitations on the present invention.

[0047] Embodiment 1

[0048] like Figure 1 As shown, the present invention provides a method for optimizing a variable resistance test of an automobile, comprising:

[0049] S1, establishing an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the corresponding influencing factors of different vehicle models under different working conditions, and the influencing factors are used to describe the influence of wind resistance on the resistance of the entire vehicle; the air resistance coefficient database stores the corresponding air resistance coefficients of different vehicle models under different active air intake grille opening conditions;

[0050] S3, obtaining the model, speed and opening of the active air intake grille of the vehicle to be tested in real time, and determining the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested according to the model, opening of the active air intake grille and air resistance coefficient database of the vehicle to be tested;

[0051] S5, determining the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current opening of the active air intake grille;

[0052] S7, determining the resistance loaded on the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and realizing real-time modification of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer.

[0053] Among them, in step S1, the expert processing system (expert system) includes an expert experience database and an air resistance coefficient database, wherein the expert experience database stores a mapping relationship between vehicle types, working conditions, and influencing factors, and the influencing factors are used to describe the influence of wind resistance on the resistance of the entire vehicle, that is, the proportion of wind resistance of a certain vehicle type under certain working conditions to the resistance of the entire vehicle; the working conditions include vehicle speed and test environment conditions, and the test environment conditions include the temperature of the environment of the vehicle to be tested, the humidity of the environment of the vehicle to be tested, etc., and may also be other working conditions, which are not limited in the embodiments of the present invention.

[0054] The vehicle economy test on the chassis dynamometer is mainly related to the vehicle's driving resistance. The vehicle's driving resistance on a straight road is composed of air resistance, rolling resistance and acceleration resistance. The calculation formula is:

[0055] F=F f +F w +F j

[0056] Where: F is the vehicle driving resistance (vehicle resistance), N; F f is the rolling resistance of the car, N; F w is air resistance, N; F j is the acceleration resistance, N.

[0057] In the vehicle economy test on the chassis dynamometer, it is necessary to fit the loaded resistance on the chassis dynamometer according to the road sliding resistance. The resistance curve loaded on the chassis dynamometer can be described by a mathematical model, which is:

[0058] F=a+bv+cv 2

[0059] The expert experience database can be used to evaluate the wind resistance F of a certain model of vehicle under different working conditions. WThe expert experience database is an experience database (in the form of mean, standard deviation, etc.) obtained by summarizing a large number of drum (chassis dynamometer) test data of different models under different working conditions. Through the wind resistance under the current working conditions, the influence factor of wind resistance on the total resistance of drum loading can be obtained, so as to adjust the resistance curve of drum loading F=a+bv+cv in real time. 2 .

[0060] When the vehicle is driving, it can generally be considered to collect rolling resistance, wind resistance, acceleration resistance, etc. Among them, wind resistance is affected by factors such as vehicle speed and vehicle status. At different vehicle speeds, the proportion of wind resistance in the total resistance of the vehicle is also different.

[0061] The air resistance coefficient database stores the corresponding air resistance coefficients of different models under different active air intake grille opening conditions, that is, it stores the mapping relationship between the model, the active air intake grille opening, and the air resistance coefficient. The air resistance coefficient database can be used to evaluate the air resistance coefficient of a certain model of the vehicle to be tested under a certain active air intake grille opening. The air resistance coefficient database is an empirical database (in the form of mean, standard deviation, etc.) that summarizes a large amount of test data of different models under active air intake grille openings.

[0062] Among them, in step S3, the model, speed and opening of the active air intake grille of the vehicle to be tested are obtained in real time, and the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested is determined according to the model of the vehicle to be tested, the opening of the active air intake grille, and the air resistance coefficient database (which can also be presented in the form of an air resistance coefficient data table). The device for acquiring data in real time can be a data acquisition device (test data acquisition device) or other data acquisition devices. It can be the same device with different acquisition modules integrated, or it can be different data acquisition modules that exist separately. The present invention is not limited here.

[0063] Furthermore, if Figure 2 As shown, the technical solution of the present invention provides a method for optimizing a variable resistance test of an automobile, which, before step S5, further includes:

[0064] S4, obtaining the air density ρ and the windward area of ​​the vehicle to be tested in the test environment of the vehicle to be tested.

[0065] In step S4, different models have different frontal areas and wind resistances. The same model has different air densities ρ under different test environments and wind resistances.

[0066] Specifically, step S5 determines the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current active air intake grille opening:

[0067] The air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening are input into the CFD simulation software to calculate the corresponding wind resistance of the vehicle to be tested.

[0068] Among them, the wind resistance corresponding to the vehicle to be tested is calculated as follows:

[0069] F w =0.5ρ×C D ×A×v 2 ,

[0070] Among them, F w is the wind resistance corresponding to the vehicle to be tested, ρ is the air density in the test environment of the vehicle to be tested, kg / m3; C D is the air resistance coefficient corresponding to the current active air intake grille opening of the vehicle model to be tested; A is the frontal area of ​​the vehicle corresponding to the vehicle model to be tested, m2; v is the speed of the vehicle to be tested, m / s.

[0071] In step S7, the resistance loaded by the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and the real-time modification of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer is realized. Specifically, the following steps are performed:

[0072] Determine the resistance loaded on the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and send the resistance data determined on the chassis dynamometer to the chassis dynamometer control device;

[0073] The chassis dynamometer control equipment adjusts and controls the loading resistance of the chassis dynamometer in real time according to the resistance data of the chassis dynamometer loading, and adjusts and sets the chassis dynamometer loading resistance curve in real time, so as to realize the real-time correction of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer bench.

[0074] Among them, the chassis dynamometer loading resistance curve is a quadratic equation of the total drum loading resistance of the vehicle to be tested relative to the vehicle speed of the vehicle to be tested. The opening of the active air intake grille can be adjusted in real time according to the vehicle speed and heat dissipation requirements of the vehicle to be tested.

[0075] The vehicle equipped with the active air intake grille in the embodiment of the present invention has different openings of the active air intake grille and different wind resistance at the same speed. At present, when the vehicle is tested, the active air intake grille is tested at a fixed opening. However, during the actual driving process, the opening of the active air intake grille will change due to the need for heat dissipation, and the wind resistance will also change. The current test cannot be in line with reality. For example, at the beginning of the test, the opening of the active air intake grille is closed. As the test progresses, the opening of the active air intake grille changes to 30%. The change in opening will cause the wind resistance coefficient to change, and the wind resistance will also change accordingly, so that the wind resistance can be calculated in real time through CFD, and then the influence factor of the wind resistance on the resistance of the whole vehicle can be determined through the expert experience database, so as to change the curve F=a+bv+cv loaded by the drum (chassis dynamometer) in real time. 2 , which solves the problem that the current chassis dynamometer bench test can only be carried out under the fixed opening of the active air intake grille, so that the test results are closer to the actual situation of the user and simulate the resistance of the user when actually driving; according to the real-time collected vehicle speed v and the opening of the active air intake grille, the resistance curve loaded by the chassis dynamometer is adjusted in real time, which improves the consistency of the test results such as energy consumption, driving range, and emissions with the actual performance results of the user; the resistance curve loaded by the chassis dynamometer is adjusted in real time according to the opening of the active air intake grille, and the impact of the change of the opening of the active air intake grille on the energy consumption of the whole vehicle can be effectively tested through the chassis dynamometer test.

[0076] In the technical solution of the present invention, an expert experience database and an air resistance coefficient database are established; the model, speed and opening of the active air intake grille of the vehicle to be tested are obtained in real time, and the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested is determined according to the model, opening of the active air intake grille and the air resistance coefficient database of the vehicle to be tested; the corresponding wind resistance is determined according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current opening of the active air intake grille; the resistance loaded by the chassis dynamometer is determined according to the corresponding wind resistance of the vehicle to be tested and the expert experience database, so that the chassis dynamometer bench can modify the resistance of the whole vehicle at different openings of the active air intake grille in real time, effectively solving the problem of low accuracy and reliability of variable resistance test of the vehicle caused by the prior art, and effectively improving the accuracy and reliability of variable resistance test of the vehicle.

[0077] In the technical solution of the present invention, the expert experience database stores the influencing factors corresponding to different vehicle models under different working conditions. The working conditions include vehicle speed and test environment conditions. The test environment conditions include the temperature of the environment of the vehicle to be tested and the humidity of the environment of the vehicle to be tested, which expands the application scope of the variable resistance test of the vehicle and makes the variable resistance test results of the vehicle more accurate.

[0078] In the technical solution of the present invention, the wind resistance corresponding to the vehicle to be tested is calculated according to the air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening. Not only the environmental conditions of different vehicles to be tested but also the model factors of the vehicle to be tested are taken into account, so that the calculation result of the wind resistance corresponding to the vehicle to be tested is more accurate, thereby ensuring the accuracy of the variable resistance test result of the vehicle.

[0079] In the technical solution of the present invention, the resistance loaded by the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and an expert experience database, and the resistance data determined by the chassis dynamometer are sent to the chassis dynamometer control device; the chassis dynamometer control device performs real-time adjustment and control of the loading resistance of the chassis dynamometer according to the resistance data determined by the chassis dynamometer, and adjusts and sets the chassis dynamometer loading resistance curve in real time, so that the chassis dynamometer bench can realize real-time modification of the vehicle resistance under different openings of the active air intake grille (which can be adjusted in real time according to the speed and heat dissipation requirements of the vehicle to be tested), thereby ensuring the accuracy and reliability of the variable resistance test results of the vehicle.

[0080] Embodiment 2

[0081] like Figure 3 As shown, the technical solution of the present invention also provides a variable resistance test optimization device for an automobile, comprising:

[0082] Establishing module 101, establishing an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the corresponding influencing factors of different vehicle models under different working conditions, and the influencing factors are used to describe the influence of wind resistance on the resistance of the entire vehicle; the air resistance coefficient database stores the corresponding air resistance coefficients of different vehicle models under different active air intake grille opening conditions;

[0083] The first acquisition module 102 acquires the vehicle model, vehicle speed and opening of the active air intake grille of the vehicle to be tested in real time, and determines the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested according to the vehicle model, opening of the active air intake grille and the air resistance coefficient database;

[0084] The first determination module 103 determines the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient under the current opening of the active air intake grille;

[0085] The second determination module 104 determines the resistance loaded by the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, so as to achieve real-time modification of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer.

[0086] Specifically, Figure 4As shown, the variable resistance test optimization device for an automobile provided in this embodiment further includes:

[0087] The second acquisition module 105 acquires the air density ρ and the windward area of ​​the vehicle to be tested in the test environment of the vehicle to be tested.

[0088] Accordingly, in the first determination module 103, determining the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current active air intake grille opening specifically includes:

[0089] The air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening are input into the CFD simulation software to calculate the corresponding wind resistance of the vehicle to be tested.

[0090] The specific implementation process of the establishment module 101, the first acquisition module 102, the first determination module 103, the second determination module 104, and the second acquisition module 105 in the technical solution of the present invention corresponds to the steps in Example 1, and this embodiment does not limit it here.

[0091] In the technical solution of the present invention, an expert experience database and an air resistance coefficient database are established; the model, speed and opening of the active air intake grille of the vehicle to be tested are obtained in real time, and the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested is determined according to the model, opening of the active air intake grille and the air resistance coefficient database of the vehicle to be tested; the corresponding wind resistance is determined according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current opening of the active air intake grille; the resistance loaded by the chassis dynamometer is determined according to the corresponding wind resistance of the vehicle to be tested and the expert experience database, so that the chassis dynamometer bench can modify the resistance of the whole vehicle at different openings of the active air intake grille in real time, effectively solving the problem of low accuracy and reliability of variable resistance test of the vehicle caused by the prior art, and effectively improving the accuracy and reliability of variable resistance test of the vehicle.

[0092] In the technical solution of the present invention, the expert experience database stores the influencing factors corresponding to different vehicle models under different working conditions. The working conditions include vehicle speed and test environment conditions. The test environment conditions include the temperature of the environment of the vehicle to be tested and the humidity of the environment of the vehicle to be tested, which expands the application scope of the variable resistance test of the vehicle and makes the variable resistance test results of the vehicle more accurate.

[0093] In the technical solution of the present invention, the wind resistance corresponding to the vehicle to be tested is calculated according to the air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening. Not only the environmental conditions of different vehicles to be tested but also the model factors of the vehicle to be tested are taken into account, so that the calculation result of the wind resistance corresponding to the vehicle to be tested is more accurate, thereby ensuring the accuracy of the variable resistance test result of the vehicle.

[0094] In the technical solution of the present invention, the resistance loaded by the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and an expert experience database, and the resistance data determined by the chassis dynamometer are sent to the chassis dynamometer control device; the chassis dynamometer control device performs real-time adjustment and control of the loading resistance of the chassis dynamometer according to the resistance data determined by the chassis dynamometer, and adjusts and sets the chassis dynamometer loading resistance curve in real time, so that the chassis dynamometer bench can realize real-time modification of the vehicle resistance under different openings of the active air intake grille (which can be adjusted in real time according to the speed and heat dissipation requirements of the vehicle to be tested), thereby ensuring the accuracy and reliability of the variable resistance test results of the vehicle.

[0095] Embodiment 3

[0096] like Figure 5-Figure 6 As shown, the technical solution of the present invention also provides a variable resistance test optimization system for an automobile, including: a chassis dynamometer 1, a data acquisition device 2, a data processing system 3 (expert processing system), and a chassis dynamometer control device 4, wherein the data acquisition device 2 is used to obtain the model, speed, and opening of the active air intake grille of the automobile to be tested in real time, and the model, speed, and opening of the active air intake grille of the automobile to be tested are obtained in real time and sent to the data processing system 3; the data processing system 3 is used to establish an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the influence factors corresponding to different models under different working conditions, and the influence factors are used to describe the influence of wind resistance on the resistance of the entire vehicle; the air resistance coefficient database stores the air resistance coefficients corresponding to different models under different active air intake grille opening conditions. Drag coefficient; and determine the air drag coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested according to the model of the vehicle to be tested, the opening of the active air intake grille, and the air drag coefficient database; determine the corresponding wind resistance according to the speed of the vehicle to be tested and the air drag coefficient corresponding to the current opening of the active air intake grille; determine the resistance loaded on the chassis dynamometer 1 according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and send the resistance data determined on the chassis dynamometer 1 to the chassis dynamometer control device 4; the chassis dynamometer control device 4 is used to adjust and control the loading resistance of the chassis dynamometer 1 in real time according to the resistance data determined on the chassis dynamometer 1, and adjust and set the loading resistance curve of the chassis dynamometer 1 in real time, so as to realize the real-time correction of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer bench.

[0097] The data acquisition device 2 (test data acquisition device) can also be used to obtain the air density ρ and the windward area of ​​the vehicle to be tested in the test environment of the vehicle to be tested, so that the data processing system can calculate the corresponding wind resistance of the vehicle to be tested based on the air density ρ in the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening.

[0098] In the technical solution of the present invention, an expert experience database and an air resistance coefficient database are established; the model, speed and opening of the active air intake grille of the vehicle to be tested are obtained in real time, and the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested is determined according to the model, opening of the active air intake grille and the air resistance coefficient database of the vehicle to be tested; the corresponding wind resistance is determined according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current opening of the active air intake grille; the resistance loaded by the chassis dynamometer is determined according to the corresponding wind resistance of the vehicle to be tested and the expert experience database, so that the chassis dynamometer bench can modify the resistance of the whole vehicle at different openings of the active air intake grille in real time, effectively solving the problem of low accuracy and reliability of variable resistance test of the vehicle caused by the prior art, and effectively improving the accuracy and reliability of variable resistance test of the vehicle.

[0099] In the technical solution of the present invention, the expert experience database stores the influencing factors corresponding to different vehicle models under different working conditions. The working conditions include vehicle speed and test environment conditions. The test environment conditions include the temperature of the environment of the vehicle to be tested and the humidity of the environment of the vehicle to be tested, which expands the application scope of the variable resistance test of the vehicle and makes the variable resistance test results of the vehicle more accurate.

[0100] In the technical solution of the present invention, the wind resistance corresponding to the vehicle to be tested is calculated according to the air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening. Not only the environmental conditions of different vehicles to be tested but also the model factors of the vehicle to be tested are taken into account, so that the calculation result of the wind resistance corresponding to the vehicle to be tested is more accurate, thereby ensuring the accuracy of the variable resistance test result of the vehicle.

[0101] In the technical solution of the present invention, the resistance loaded by the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and an expert experience database, and the resistance data determined by the chassis dynamometer are sent to the chassis dynamometer control device; the chassis dynamometer control device performs real-time adjustment and control of the loading resistance of the chassis dynamometer according to the resistance data determined by the chassis dynamometer, and adjusts and sets the chassis dynamometer loading resistance curve in real time, so that the chassis dynamometer bench can realize real-time modification of the vehicle resistance under different openings of the active air intake grille (which can be adjusted in real time according to the speed and heat dissipation requirements of the vehicle to be tested), thereby ensuring the accuracy and reliability of the variable resistance test results of the vehicle.

[0102] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A variable resistance test optimization method for an automobile, characterized in that: include: Establishing an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the corresponding influencing factors of different vehicle models under different working conditions, and the influencing factors are used to describe the influence of wind resistance on the resistance of the entire vehicle; the air resistance coefficient database stores the corresponding air resistance coefficients of different vehicle models under different active air intake grille opening conditions; The vehicle model, vehicle speed and opening of the active air intake grille of the vehicle to be tested are obtained in real time, and the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested is determined according to the vehicle model, opening of the active air intake grille and air resistance coefficient database; Determine the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current opening of the active air intake grille; The resistance loaded on the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, so that the chassis dynamometer bench can modify the vehicle resistance at different openings of the active air intake grille in real time.

2. The variable resistance test optimization method for an automobile according to claim 1, characterized in that: The operating conditions include vehicle speed and test environment conditions. The test environment conditions include the temperature of the environment of the vehicle to be tested, the humidity of the environment of the vehicle to be tested, and the wind speed of the environment of the vehicle to be tested.

3. The variable resistance test optimization method for an automobile according to claim 1, characterized in that: Before determining the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current active air intake grille opening, the method further includes: Obtain the air density ρ and the windward area of ​​the vehicle to be tested in the test environment.

4. The variable resistance test optimization method for an automobile according to claim 3 is characterized in that: Determining the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current active air intake grille opening specifically includes: The air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening are input into the CFD simulation software to calculate the corresponding wind resistance of the vehicle to be tested.

5. The variable resistance test optimization method for an automobile according to claim 4, characterized in that: The calculation of the wind resistance corresponding to the vehicle to be tested is specifically as follows: F w =0.5ρ×C D ×A×v 2 , Among them, F w is the wind resistance corresponding to the vehicle to be tested, ρ is the air density in the test environment of the vehicle to be tested; C D is the air resistance coefficient corresponding to the current active air intake grille opening of the vehicle model to be tested; A is the frontal area of ​​the vehicle corresponding to the vehicle model to be tested; v is the speed of the vehicle to be tested.

6. The variable resistance test optimization method for an automobile according to claim 1, characterized in that: The method of determining the resistance loaded on the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and realizing the real-time modification of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer bench specifically includes: Determine the resistance loaded on the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, and send the resistance data determined on the chassis dynamometer to the chassis dynamometer control device; The chassis dynamometer control equipment adjusts and controls the loading resistance of the chassis dynamometer in real time according to the resistance data of the chassis dynamometer loading, and adjusts and sets the chassis dynamometer loading resistance curve in real time, so as to realize the real-time correction of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer bench.

7. A variable resistance test optimization device for an automobile, characterized in that: include: Establishing a module, establishing an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the corresponding influencing factors of different vehicle models under different working conditions, and the influencing factors are used to describe the influence of wind resistance on the resistance of the entire vehicle; the air resistance coefficient database stores the corresponding air resistance coefficients of different vehicle models under different active air intake grille opening conditions; The first acquisition module acquires the model, speed and opening of the active air intake grille of the vehicle to be tested in real time, and determines the air resistance coefficient corresponding to the current opening of the active air intake grille of the vehicle to be tested according to the model, opening of the active air intake grille and air resistance coefficient database of the vehicle to be tested; The first determination module determines the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient under the current opening of the active air intake grille; The second determination module determines the resistance loaded on the chassis dynamometer according to the wind resistance corresponding to the vehicle to be tested and the expert experience database, so as to realize the real-time modification of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer.

8. The variable resistance test optimization device for an automobile according to claim 7, characterized in that: include: The second acquisition module acquires the air density ρ and the windward area of ​​the vehicle to be tested in the test environment of the vehicle to be tested.

9. The variable resistance test optimization device for an automobile according to claim 8, characterized in that: In the first determination module, determining the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current active air intake grille opening specifically includes: The air density ρ under the test environment of the vehicle to be tested, the windward area of ​​the vehicle to be tested, the speed of the vehicle to be tested, and the corresponding air resistance coefficient under the current active air intake grille opening are input into the CFD simulation software to calculate the corresponding wind resistance of the vehicle to be tested.

10. A variable resistance test optimization system for an automobile, characterized in that: include: A chassis dynamometer, data acquisition equipment, a data processing system, and a chassis dynamometer control device, wherein the data acquisition equipment is used to obtain the model, speed, and opening of the active air intake grille of the vehicle to be tested in real time, and the model, speed, and opening of the active air intake grille of the vehicle to be tested are obtained in real time and sent to the data processing system; the data processing system is used to establish an expert experience database and an air resistance coefficient database, wherein the expert experience database stores the corresponding influencing factors of different models under different working conditions, and the influencing factors are used to describe the influence of wind resistance on the resistance of the entire vehicle; the air resistance coefficient database stores the corresponding air resistance coefficients of different models under different active air intake grille opening conditions; and the corresponding air resistance coefficient of the vehicle to be tested under the current active air intake grille opening is determined according to the model of the vehicle to be tested, the opening of the active air intake grille, and the air resistance coefficient database; Determine the corresponding wind resistance according to the speed of the vehicle to be tested and the corresponding air resistance coefficient at the current opening of the active air intake grille; The resistance loaded on the chassis dynamometer is determined according to the wind resistance corresponding to the vehicle to be tested and an expert experience database, and the resistance data determined on the chassis dynamometer are sent to a chassis dynamometer control device; the chassis dynamometer control device is used to perform real-time adjustment and control of the loading resistance of the chassis dynamometer according to the resistance data determined on the chassis dynamometer, and to adjust and set the chassis dynamometer loading resistance curve in real time, so as to realize real-time correction of the vehicle resistance at different openings of the active air intake grille by the chassis dynamometer bench.

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