Vehicle centroid determination method and device

Abstract

The application provides a vehicle mass center determination method and device, comprising: obtaining a basic vehicle model mass center height, a basic vehicle model height, a newly developed vehicle model height, a vehicle body configuration influence parameter on the mass center height, and a power assembly influence parameter on the mass center height; calculating a correction coefficient according to the basic vehicle model height and the newly developed vehicle model height; correcting the basic vehicle model mass center height according to the correction coefficient to obtain a basic vehicle model mass center correction height; and calculating a newly developed vehicle model first estimated mass center height according to the basic vehicle model mass center correction height, the vehicle body configuration influence parameter on the mass center height, and the power assembly influence parameter on the mass center height. The vehicle mass center determination method and device can quickly and accurately predict the vehicle mass center height in the early stage of vehicle project development.

Description

Technical Field

[0001] This invention belongs to the field of vehicle center of gravity calculation, and more specifically, relates to a method and apparatus for determining the center of gravity of a vehicle. Background Technology

[0002] As one of the important basic parameters of a vehicle, the center of gravity height has a significant impact on the vehicle's dynamic performance, mainly reflected in aspects such as power, braking, and handling stability. For example, the vehicle's posture, suspension status, and steering characteristics during acceleration, braking, and cornering are all affected by the center of gravity height. Especially when cornering at high speeds, an excessively high center of gravity height can easily lead to rollover accidents.

[0003] In the early stages of a vehicle development project, many components and assemblies are not yet fully defined, and no actual prototype has been produced, making it impossible to obtain a measured vehicle center of gravity height. At this stage, it is necessary to predict the vehicle center of gravity height to provide reliable input for the selection, simulation, and verification of chassis, safety, and other modules. However, existing technologies lack methods for quickly and accurately predicting the vehicle center of gravity height in the early stages of a vehicle development project. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the lack of a method in the existing technology for quickly and accurately predicting the height of the vehicle's center of gravity in the early stages of vehicle project development, and to provide a method for determining the center of gravity of a vehicle.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A method for determining the center of gravity of a vehicle includes the following steps:

[0007] Obtain the center of gravity height of the base model, the height of the base model, the height of the newly developed model, the parameters of the influence of body configuration on the center of gravity height, and the parameters of the influence of powertrain on the center of gravity height;

[0008] The correction coefficient is calculated based on the height of the base vehicle and the height of the newly developed vehicle.

[0009] The center of gravity height of the base vehicle is corrected according to the correction coefficient, and the corrected center of gravity height of the base vehicle is calculated.

[0010] Based on the base model's center of gravity correction height, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height, the first estimated center of gravity height of the newly developed model is calculated.

[0011] Furthermore, the step of calculating the correction coefficient based on the height of the base vehicle model and the height of the newly developed vehicle model includes:

[0012] The correction coefficient is obtained based on the ratio of the height of the newly developed vehicle model to the height of the base vehicle model;

[0013] The step of correcting the center of gravity height of the base vehicle model according to the correction coefficient, and calculating the corrected center of gravity height of the base vehicle model, includes:

[0014] The corrected height of the base vehicle's center of gravity is obtained by multiplying the base vehicle's center of gravity height by the correction coefficient.

[0015] Furthermore, the step of obtaining the parameters affecting the center of gravity height of the vehicle body configuration includes:

[0016] Obtain the weight of the body configuration of the newly developed model and the weight of the body configuration of the base model. Based on the difference between the weight of the body configuration of the newly developed model and the weight of the body configuration of the base model, and the influence parameter of the body unit weight on the center of gravity height, calculate the influence parameter of the body configuration on the center of gravity height.

[0017] The step of obtaining the parameters of the powertrain's influence on the center of gravity height includes:

[0018] Obtain the powertrain type of the newly developed vehicle model and the powertrain type of the base vehicle model. Based on the powertrain type of the newly developed vehicle model and the powertrain type of the base vehicle model, obtain the influence parameters of the powertrain on the center of gravity height.

[0019] Further, the step of calculating the first estimated center of gravity height of the newly developed model based on the base model's center of gravity correction height, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height includes:

[0020] The first estimated center of gravity height of the newly developed model is calculated based on the sum of the center of gravity correction height of the base model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height.

[0021] Furthermore, after calculating the first estimated center of gravity height of the newly developed vehicle model, the method also includes obtaining a primary target for the center of gravity height of the newly developed vehicle model and a primary target for the amount of reduction in center of gravity height.

[0022] The steps for obtaining the initial target for the center of gravity height and the initial target for the reduction in center of gravity height of the newly developed vehicle include:

[0023] Obtain the required center of gravity height of the newly developed vehicle model, and calculate the initial target of the center of gravity height of the newly developed vehicle model and the initial target of the reduction in center of gravity height based on the first estimated center of gravity height of the newly developed vehicle model and the required center of gravity height of the newly developed vehicle model.

[0024] When the first estimated center of gravity height of the newly developed vehicle is less than or equal to the required center of gravity height of the newly developed vehicle, the required center of gravity height of the newly developed vehicle shall be used as the primary target for the center of gravity height of the newly developed vehicle.

[0025] When the first estimated center of gravity height of the newly developed model is greater than the required center of gravity height of the newly developed model, the required center of gravity height of the newly developed model is used as the primary target for the center of gravity height of the newly developed model, and the primary target for the reduction in center of gravity height is obtained based on the difference between the first estimated center of gravity height of the newly developed model and the required center of gravity height of the newly developed model.

[0026] Furthermore, after obtaining the initial target for the center of gravity height and the initial target for the reduction in center of gravity height of the newly developed vehicle model, the method further includes obtaining the second estimated center of gravity height of the newly developed vehicle model.

[0027] The process of obtaining the second estimated center of gravity height of the newly developed vehicle includes:

[0028] Obtain the weight of the components of the newly developed vehicle model and the coordinates of the center of gravity of the components. Based on the weight of the components and the coordinates of the center of gravity of the components, calculate the estimated coordinates of the center of gravity of the newly developed vehicle model.

[0029] Obtain the ground line of the newly developed vehicle model, and calculate the second estimated center of gravity height of the newly developed vehicle model based on the distance between the estimated center of gravity coordinates of the newly developed vehicle model and the ground line of the newly developed vehicle model.

[0030] Furthermore, after obtaining the second estimated center of gravity height of the newly developed vehicle model, the process also includes:

[0031] The final target for reducing the center of gravity is obtained based on the difference between the second estimated center of gravity height of the newly developed vehicle model and the required center of gravity height of the newly developed vehicle model.

[0032] Furthermore, after obtaining the final target for the reduction in center of gravity based on the difference between the second estimated center of gravity height of the newly developed model and the required center of gravity height of the newly developed model, the method further includes adjusting the actual center of gravity height of the newly developed model according to the final target for the reduction in center of gravity height.

[0033] The adjustment of the actual center of gravity height of the newly developed vehicle model according to the ultimate target of the reduction in center of gravity height includes:

[0034] The ultimate target of reducing the centroid height is decomposed into the reduction of the centroid coordinate of the newly developed vehicle and the elevation of the ground line of the newly developed vehicle.

[0035] The ultimate goal of reducing the center of gravity height is achieved by adjusting the amount of reduction in the center of gravity coordinates of the newly developed vehicle and / or the amount of elevation of the ground line of the newly developed vehicle.

[0036] Furthermore, the adjustment of the ground line elevation of the newly developed vehicle model includes:

[0037] By shortening the length of the shock absorber springs in the newly developed vehicle model or increasing the stiffness of the shock absorber springs in the newly developed vehicle model, the distance between the origin of the coordinate system of the newly developed vehicle model and the ground line of the newly developed vehicle model is reduced, thereby adjusting the amount of ground line elevation of the newly developed vehicle model.

[0038] Furthermore, the adjustment of the reduction in the center-of-gravity coordinates of the newly developed vehicle model includes:

[0039] The reduction in the centroid coordinates of the newly developed vehicle is obtained based on the difference between the final target of the reduction in centroid height and the elevation of the ground line of the newly developed vehicle.

[0040] The reduction in the center of gravity coordinate of the newly developed model is adjusted by reducing the height of the body configuration or the weight of the powertrain.

[0041] The present invention also provides a vehicle center of gravity determination device, comprising:

[0042] The acquisition module is used to acquire the center of gravity height of the base model, the height of the base model, the height of the newly developed model, the parameters of the influence of body configuration on the center of gravity height, and the parameters of the influence of powertrain on the center of gravity height.

[0043] A correction coefficient determination module is connected to the acquisition module, and the correction coefficient determination module is used to calculate and obtain the correction coefficient based on the height of the base vehicle model and the height of the newly developed vehicle model.

[0044] A base vehicle center of gravity correction height determination module is provided, which is connected to the acquisition module and the correction coefficient determination module respectively. The base vehicle center of gravity correction height determination module is used to correct the center of gravity height of the base vehicle according to the correction coefficient and calculate the center of gravity correction height of the base vehicle.

[0045] The module for determining the first estimated center of gravity height of the newly developed vehicle model is connected to the acquisition module and the module for determining the center of gravity correction height of the base vehicle model. The module is used to calculate the first estimated center of gravity height of the newly developed vehicle model based on the center of gravity correction height of the base vehicle model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height.

[0046] The beneficial effect of this invention is that by using vehicle-level data such as the height, body configuration, and powertrain of the newly developed model that can be obtained in the early stages of vehicle project development, and using the base model as a reference, a correction coefficient is obtained to correct the center of gravity height of the base model. Then, based on the corrected center of gravity height of the base model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height, the first estimated center of gravity height of the newly developed model is calculated. Thus, it is possible to complete the rapid and accurate center of gravity prediction of the whole vehicle in the early stages of vehicle project development using limited vehicle-level data. Attached Figure Description

[0047] Figure 1 This is a flowchart illustrating a method for determining the center of gravity of a vehicle in one embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of the structure of a vehicle center of gravity determination device in one embodiment of the present invention.

[0049] The reference numerals in the accompanying drawings are as follows:

[0050] 1. Acquisition module; 2. Correction coefficient determination module; 3. Basic vehicle center of gravity correction height determination module; 4. Newly developed vehicle first estimated center of gravity height determination module. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] The method for determining the center of gravity of a vehicle provided in this embodiment of the invention, such as Figure 1 As shown, the process includes the following steps S10 to S40.

[0053] S10. Obtain the center of gravity height of the base model, the height of the base model, the height of the newly developed model, the parameters of the influence of body configuration on the center of gravity height, and the parameters of the influence of powertrain on the center of gravity height.

[0054] Optionally, in step S10, the parameters affecting the center of gravity height of the vehicle body configuration are obtained, including:

[0055] S11. Obtain the weight of the body configuration of the newly developed model and the weight of the body configuration of the base model. Based on the difference between the weight of the body configuration of the newly developed model and the weight of the body configuration of the base model, and the influence parameters of the body unit weight on the center of gravity height, calculate the influence parameters of the body configuration on the center of gravity height.

[0056] By using the vehicle body configuration data that can be obtained in the early stages of vehicle project development, and comparing it with the base model, we can predict the change in center of gravity height caused by the body configuration of the newly developed model. This data serves as the first input for calculating the predicted center of gravity height of the new model, thereby improving the accuracy of the vehicle's center of gravity prediction.

[0057] In an embodiment of the present invention, the newly developed vehicle body configuration includes a roof trim strip and a panoramic glass, and the weight M of the roof trim strip is known. 顶装饰条 =3kg, weight of the skylight glass M 天幕玻璃 =23kg. The base model includes a panoramic sunroof, but does not include roof rails. The panoramic sunroof weighs M. 全景天窗 = 22kg. Based on design experience, for roof components, the influence parameter of the body unit weight on the center of gravity height is +(0.7~0.8mm) / kg. Correspondingly, the influence parameter μ of the body configuration on the center of gravity height is... 车身配置 The product of μ and the difference between the weight of the newly developed vehicle body configuration and the weight of the base vehicle body configuration, multiplied by the parameter representing the effect of the unit weight of the body on the center of gravity height. 车身配置 =(M 天幕玻璃 +M 顶装饰条 -M 全景天窗 )×(0.7~0.8mm) / kg, that is (23kg+3kg-22kg)×(0.7~0.8mm) / kg=(2.8~3.2mm).

[0058] Optionally, in step S10, the parameters affecting the powertrain's height on the center of gravity are obtained, including:

[0059] S12. Obtain the powertrain type of the newly developed vehicle model and the powertrain type of the base vehicle model. Based on the powertrain type of the newly developed vehicle model and the powertrain type of the base vehicle model, obtain the powertrain's influence parameters on the center of gravity height.

[0060] By using powertrain data obtained in the early stages of vehicle project development, and comparing it with the base model, we can estimate the change in center of gravity height brought about by the powertrain of the newly developed model. This data serves as the first input for calculating the estimated center of gravity height of the new model, thereby improving the accuracy of the overall vehicle center of gravity prediction.

[0061] In an embodiment of the present invention, the base model has a 1.5T powertrain, and the newly developed model has a 2.0T powertrain. For both the 1.5T and 2.0T powertrain types, based on design experience, the powertrain's influence parameter on the center of gravity is μ. 动力总成 It is -(8~10)mm.

[0062] S20. The correction coefficient is calculated based on the height of the base model and the height of the newly developed model.

[0063] Optionally, step S20, which involves calculating the correction coefficient based on the height of the base model and the height of the newly developed model, includes:

[0064] S21. Obtain the correction coefficient based on the ratio of the height of the newly developed model to the height of the base model.

[0065] By obtaining the height of the newly developed model in the early stages of the vehicle project development, and using the base model as a reference, a correction coefficient can be calculated to correct the center of gravity height of the base model. This correction coefficient serves as the first estimated center of gravity height calculation input for the newly developed model, thereby improving the accuracy of the vehicle's center of gravity prediction.

[0066] In an embodiment of the present invention, the height of the base vehicle is H1, the height of the newly developed vehicle is H2, and the correction factor is K1. The formula for calculating the correction factor K1 is as follows:

[0067] K1=H2 / H1(Formula 1)

[0068] Given that the height H1 of the base model is 1668mm and the height H2 of the newly developed model is 1663mm, the correction coefficient K1 = H2 / H1 = 1663 / 1668 = 0.997 is calculated according to Formula 1.

[0069] S30. Correct the center of gravity height of the base model according to the correction factor, and calculate the corrected center of gravity height of the base model.

[0070] By correcting the center of gravity height of the base model in the early stages of vehicle project development, the corrected center of gravity height of the base model is calculated and used as the first estimated center of gravity height calculation input for the newly developed model, thereby improving the accuracy of the vehicle center of gravity prediction.

[0071] Optionally, step S30, which involves correcting the center-of-gravity height of the base vehicle model according to the correction coefficient to obtain the corrected center-of-gravity height of the base vehicle model, includes:

[0072] S31. Obtain the corrected height of the center of gravity of the base model by multiplying the center of gravity height of the base model by the correction coefficient.

[0073] In an embodiment of the present invention, the known center of gravity height hg1 of the base vehicle is 681 mm. According to step S21, the correction coefficient K1 is 0.997. The corrected center of gravity height of the base vehicle is obtained as 678.957 mm by multiplying the center of gravity height of the base vehicle by the correction coefficient.

[0074] S40. Based on the center of gravity correction height of the base model, the influence parameters of body configuration on center of gravity height, and the influence parameters of powertrain on center of gravity height, calculate the first estimated center of gravity height of the newly developed model.

[0075] Optionally, step S40, which involves calculating the first estimated center of gravity height of the newly developed model based on the base model's center of gravity correction height, the influence parameters of body configuration on center of gravity height, and the influence parameters of powertrain on center of gravity height, includes:

[0076] S41. Based on the sum of the base model's center of gravity correction height, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height, calculate the first estimated center of gravity height of the newly developed model.

[0077] In an embodiment of the present invention, the formula for calculating the first estimated center of gravity height hg2 of the newly developed vehicle model is as follows:

[0078] hg2=K1×hg1+μ 车身配置 +μ 动力总成 (Formula 2)

[0079] Where K1 is the correction coefficient, and hg1 is the center of gravity height of the base model; μ 车身配置 The parameter representing the influence of vehicle body configuration on center of gravity height, μ 动力总成 These are parameters related to the impact of the powertrain on the vehicle's center of gravity height. The types of sunroofs in the vehicle configuration include those with and without a sunroof, small sunroofs, large sunroofs, and panoramic sunroofs. Powertrain types include 2.0T and 1.5T. Both different sunroof types and different powertrain types have a direct impact on the overall vehicle's center of gravity height.

[0080] Given that the center of gravity height hg1 of the base model is 681mm, the influence parameter of the body unit weight on the center of gravity height is a range value (0.7~0.8mm) / kg, and the influence parameter of the powertrain on the center of gravity height is a range value -(8~10)mm. Accordingly, the first estimated center of gravity height hg2 of the newly developed model calculated according to Formula 2 is also a range value.

[0081] Max(hg2) = K1 × hg1 + μ 车身配置 +μ 动力总成 = 0.997 × 681 + (23 + 3 - 22) × 0.8 - 8

[0082] =674mm;

[0083] Min(hg2)=K1×hg1+μ 车身配置 +μ 动力总成 =0.997×681+(23+3-22)×

[0084] 0.7-10=672mm;

[0085] The average value of the estimated center of gravity of the vehicle is calculated based on the maximum and minimum values ​​of the first estimated center of gravity height of the newly developed model. hg2 = average(672,674) = 673mm.

[0086] According to an embodiment of the present invention, steps S10 to S40 use vehicle-level data such as the height of the newly developed model, body configuration, and powertrain that can be obtained in the early stages of vehicle project development. Using the base model as a reference, a correction coefficient is obtained to correct the center of gravity height of the base model. Then, based on the corrected center of gravity height of the base model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height, the first estimated center of gravity height of the newly developed model is calculated. Thus, the limited vehicle-level data can be used to complete the rapid and accurate center of gravity prediction of the whole vehicle in the early stages of vehicle project development.

[0087] Optionally, after calculating the first estimated center of gravity height of the newly developed model based on the base model's center of gravity correction height, the influence parameters of body configuration on center of gravity height, and the influence parameters of powertrain on center of gravity height, step S40 further includes:

[0088] S50, Obtain the initial target for the center of gravity height and the initial target for the reduction in center of gravity height of the newly developed vehicle model.

[0089] Optionally, step S50, which involves obtaining the initial target for the center of gravity height and the initial target for the reduction in center of gravity height of the newly developed vehicle model, includes:

[0090] S51. Obtain the required centroid height of the newly developed vehicle model. Based on the first estimated centroid height of the newly developed vehicle model and the required centroid height of the newly developed vehicle model, calculate the primary target for the centroid height of the newly developed vehicle model and the primary target for the centroid height reduction.

[0091] When the first estimated center of gravity height of the newly developed model is less than or equal to the required center of gravity height of the newly developed model, the required center of gravity height of the newly developed model shall be used as the primary target for the center of gravity height of the newly developed model.

[0092] When the first estimated center of gravity height of the newly developed model is greater than the required center of gravity height of the newly developed model, the required center of gravity height of the newly developed model is used as the primary target for the center of gravity height of the newly developed model, and the primary target for the reduction in center of gravity height is obtained based on the difference between the first estimated center of gravity height of the newly developed model and the required center of gravity height of the newly developed model.

[0093] By calculating the initial target for the center of gravity height and the initial target for the reduction of the center of gravity height of the newly developed model after obtaining the first estimated center of gravity height, the target for center of gravity optimization can be determined based on the current center of gravity of the newly developed model, providing a basis for the positive design of the vehicle's center of gravity.

[0094] In an embodiment of the present invention, the newly developed vehicle model requires a center-of-gravity height h. x Based on the vehicle model positioning and combined with the current estimated center of gravity height of the newly developed model, a reasonable initial target for the center of gravity height and the initial target for the reduction in center of gravity height of the newly developed model are initially formulated:

[0095] When the first estimated center of gravity height hg2 of the newly developed model is less than or equal to the required center of gravity height h of the newly developed model x Then, the required centroid height h of the newly developed model is taken into account. x As the initial target for the center of gravity height of the newly developed vehicle; when the first estimated center of gravity height hg2 of the newly developed vehicle is greater than the required center of gravity height h of the newly developed vehicle. x In addition to the newly developed model's required center of gravity height h x In addition to the initial target for the center of gravity height of the newly developed model, it is also necessary to formulate and carry out work to reduce the center of gravity height of the newly developed model. The initial target for the amount of center of gravity height reduction is initially set as hg2-h. x .

[0096] Based on the vehicle's dynamic performance and model positioning, the required center of gravity height h for the newly developed model is known. x =665mm, and the first estimated center of gravity height hg2 of the newly developed model obtained in step S41 is 673mm, so it can be determined that the initial target for the center of gravity height of the newly developed model is 665mm, and the initial target for the reduction in center of gravity height is hg2-h x =673-665=8mm.

[0097] Optionally, after obtaining the initial target for the center of gravity height and the initial target for the reduction in center of gravity height of the newly developed vehicle model, step S50 further includes:

[0098] S60, obtain the second estimated center of gravity height of the newly developed model.

[0099] By calculating the second estimated center of gravity height of the newly developed vehicle based on the estimated center of gravity coordinates and the ground line of the newly developed vehicle, the accuracy of the overall vehicle center of gravity prediction can be further improved when more accurate vehicle-level data such as the weight of the new vehicle's components and the center of gravity coordinates of the new vehicle's components are available in the middle of the vehicle project development.

[0100] Optionally, step S60, which involves obtaining the second estimated center of gravity height of the newly developed vehicle model, includes:

[0101] S61. Obtain the weight of the new model vehicle parts and the centroid coordinates of the new model vehicle parts. Based on the weight of the new model vehicle parts and the centroid coordinates of the new model vehicle parts, calculate the estimated centroid coordinates of the new model vehicle.

[0102] In embodiments of the present invention, after the initial vehicle layout, configuration, and system scheme are preliminarily determined, engineers can assess the center-of-gravity coordinates of the newly developed vehicle's components. By collecting the weights and center-of-gravity coordinates of the newly developed vehicle's components, and based on the principle of center-of-gravity superposition, the estimated center-of-gravity coordinate z of the newly developed vehicle is obtained, using the formula:

[0103]

[0104] Where, m p For the weight of parts in the newly developed vehicle model, z p The coordinates of the center of mass of the newly developed vehicle parts.

[0105] The known center of mass coordinates are: power components 186.0, chassis components 88.4, body components 534.29, interior and exterior components 535.19, intelligent connectivity components 381.62, safety components 669.18, and consumed fluids 67.82.

[0106] Based on the weights and centroid coordinates of the newly developed vehicle's components, the estimated centroid coordinates of the newly developed vehicle are calculated.

[0107] S62. Obtain the ground line of the newly developed vehicle model. Based on the distance between the estimated centroid coordinates of the newly developed vehicle model and the ground line of the newly developed vehicle model, calculate the second estimated centroid height of the newly developed vehicle model.

[0108] In an embodiment of the present invention, based on the estimated centroid coordinate z of the newly developed vehicle model obtained in step S61, the ground line of the newly developed vehicle model is imported, and the distance between the estimated centroid coordinate z of the newly developed vehicle model and the ground line of the newly developed vehicle model is measured to obtain the second estimated centroid height hg3 of the newly developed vehicle model. Since the vehicle development process has now entered the stage where the centroid coordinates of each component can be obtained, the calculated second estimated centroid height hg3 of the newly developed vehicle model is more accurate than the first estimated centroid height hg2 of the previously developed vehicle model.

[0109] Based on the estimated centroid coordinate z of the newly developed model obtained in step S61, which is 340.1, the ground line of the newly developed model is imported, and the distance between the estimated centroid coordinate z of the newly developed model and the ground line of the newly developed model is measured to be 328mm, thereby obtaining the second estimated centroid height hg3 of the newly developed model as 668mm.

[0110] Optionally, step S60, after obtaining the second estimated center of gravity height of the newly developed vehicle model, also includes:

[0111] S70. Based on the difference between the second estimated center of gravity height of the newly developed model and the required center of gravity height of the newly developed model, the final target for the reduction in center of gravity height is obtained.

[0112] By calculating the final target for reducing the center of gravity height based on the second estimated center of gravity height of the newly developed model and the required center of gravity height of the newly developed model, a more accurate target for reducing the center of gravity height can be obtained when more precise vehicle-level data such as the weight of the components of the newly developed model and the center of gravity coordinates of the components of the newly developed model are available in the middle of the vehicle project development. This allows for more accurate guidance for the forward design of the vehicle's center of gravity.

[0113] In an embodiment of the present invention, based on the second estimated center of gravity height hg3 of the newly developed vehicle model and the required center of gravity height h of the newly developed vehicle model... x The difference between them can be used to obtain the final target of the reduction in centroid height, which is hg3-h. x The required center of gravity height h for the newly developed vehicle model is known. x =665mm, and from step S62 we obtain the second estimated center of gravity height hg3 of the newly developed model as 668mm, so the final target for the reduction in center of gravity height is 668mm-665mm=3mm. At this point, the final target of 3mm for the reduction in center of gravity height is more accurate than the initial target of 8mm for the reduction in center of gravity height determined in step S51.

[0114] Optionally, after obtaining the final target for the reduction in center of gravity based on the difference between the second estimated center of gravity height of the newly developed vehicle and the required center of gravity height of the newly developed vehicle in step S70, the method further includes:

[0115] S80. Adjust the actual center of gravity height of the newly developed model according to the ultimate goal of reducing the center of gravity height.

[0116] By decomposing the ultimate goal of reducing the center of gravity height into the reduction of the center of gravity coordinate of the newly developed model and the elevation of the ground line of the newly developed model, we can clarify the two directions for achieving the ultimate goal of reducing the center of gravity height, thereby enabling us to achieve the design objectives more clearly.

[0117] Optionally, step S80, which involves adjusting the actual center of gravity height of the newly developed vehicle model according to the ultimate target of reducing the center of gravity height, includes:

[0118] S81. The ultimate goal of reducing the center of gravity height is decomposed into the reduction of the center of gravity coordinate of the newly developed model and the elevation of the ground line of the newly developed model.

[0119] In an embodiment of the present invention, the ultimate target for the reduction in centroid height is hg3-h. x This represents the difference between the current state and the target of the newly developed vehicle model. Based on the ultimate target of reducing the center of gravity height, and considering the current state of the newly developed vehicle model, the ultimate target of reducing the center of gravity height is decomposed in two directions. Since the center of gravity height z... g = z + h0, where the height of the centroid z gh0 is the measured value of the center of gravity height, h0 is the distance between the origin of the vehicle coordinate system (0,0,0) and the ground line, and z corresponds to the coordinate value of the center of gravity.

[0120] The centroid height can be decomposed into two parts: the distance between the origin of the vehicle coordinate system (0,0,0) and the ground line, and the centroid coordinate value. Correspondingly, the ultimate target of the centroid height reduction can be decomposed into the centroid coordinate reduction Δz of the newly developed model and the ground line elevation Δh of the newly developed model, i.e., hg3-h. x =△z+△h, thereby achieving the decomposition of the ultimate goal of the center of gravity height of the newly developed model.

[0121] Given hg3-h x =3mm, so we know that △z+△h=3mm. Therefore, the final target of 3mm reduction in centroid height needs to be decomposed into two parts: the change in distance between the origin (0,0,0) of the coordinate system of the new model and the ground line of the new model, i.e., the ground line elevation of the new model △h, and the change in the centroid coordinates of the new model, i.e., the reduction in the centroid coordinates of the new model △z.

[0122] S82. By adjusting the amount of reduction in the center of gravity coordinates of the newly developed vehicle model and / or the amount of elevation of the ground line of the newly developed vehicle model, the ultimate goal of reducing the center of gravity height can be achieved.

[0123] In an embodiment of the present invention, adjusting the ground line elevation Δh of the newly developed vehicle model requires reducing the distance between the origin (0,0,0) of the coordinate system of the newly developed vehicle model and the ground line of the newly developed vehicle model. This can be achieved by reducing the ground clearance of the newly developed vehicle model through measures such as reducing the length of the damping spring or reducing the stiffness of the damping spring, thereby shifting the ground line of the newly developed vehicle model upward as a whole, and thus reducing the distance between the origin (0,0,0) of the coordinate system of the newly developed vehicle model and the ground line of the newly developed vehicle model.

[0124] To adjust the reduction amount △z of the center of gravity coordinate of the newly developed model, it is necessary to confirm the feasibility of reducing the center of gravity coordinate of the components of the newly developed model based on the current coordinate status, realize the reduction amount △z1, △z2, ... △zn of the components of the newly developed model, and combine the reduction amount of the center of gravity coordinate of each component to realize the reduction of the center of gravity coordinate of the current newly developed model.

[0125] After completing the above steps, the adjusted centroid coordinates of the newly developed vehicle parts are calculated to obtain the final target centroid coordinates of the newly developed vehicle. The final target centroid coordinates of the newly developed vehicle are obtained by adding the distance between the origin (0,0,0) of the coordinate system of the newly developed vehicle and the ground line of the adjusted newly developed vehicle. At this time, the final target centroid height of the newly developed vehicle has also been synchronously decomposed.

[0126] Optionally, step S82, which involves adjusting the reduction in the center of gravity coordinates of the newly developed vehicle model and / or the elevation of the ground line of the newly developed vehicle model to achieve the final target of reducing the center of gravity height, includes:

[0127] S821. By shortening the length of the shock absorber spring of the newly developed model or increasing the stiffness of the shock absorber spring of the newly developed model, the distance between the origin of the coordinate system of the newly developed model and the ground line of the newly developed model is reduced, so as to adjust the ground line elevation of the newly developed model.

[0128] By prioritizing the adjustment of the ground line elevation of the newly developed vehicle model to achieve the ultimate goal of reducing the center of gravity height, the adjustment method is simpler and faster.

[0129] In an embodiment of the present invention, the origin (0,0,0) of the coordinate system of the newly developed vehicle model is the line connecting the front wheel center and the rear wheel center, and the origin (0,0,0) remains unchanged after being determined. The position of the ground line of the newly developed vehicle model can be calculated using the tire radii under different loading conditions. Since the origin of the newly developed vehicle model is set as a fixed parameter, the ground line of the newly developed vehicle model will rise or fall under different loading conditions and different vehicle structures. Shortening the length of the shock absorber spring or reducing its stiffness is one way to raise the ground line of the newly developed vehicle model. By shortening the length of the shock absorber spring of the newly developed vehicle model, the distance between the origin (0,0,0) of the coordinate system of the newly developed vehicle model and the ground line of the newly developed vehicle model can be reduced from h0 = 322mm to h0 = 320mm, that is, the ground line of the newly developed vehicle model is raised by Δh = 2mm.

[0130] S822. Based on the difference between the final target of the reduction in the center of gravity height and the elevation of the ground line of the newly developed model, obtain the reduction in the center of gravity coordinates of the newly developed model.

[0131] By calculating the reduction in the center of gravity coordinates of the newly developed vehicle based on the ultimate target of the reduction in center of gravity height and the rise in the ground line of the newly developed vehicle, we can further clarify the way to achieve the ultimate target of the reduction in center of gravity height by adjusting the reduction in the center of gravity coordinates of the newly developed vehicle, and provide clearer guidance for the positive design of the vehicle's center of gravity.

[0132] Specifically, according to step S70, the final target for the reduction in centroid height is hg3-h. x After adjusting the ground line elevation of the newly developed vehicle model (i.e., reducing the distance between the origin (0,0,0) of the new vehicle model's coordinate system and the ground line of the new vehicle model), if the final target for reducing the center of gravity height has not yet been achieved, it is necessary to compare the ground line elevation of the new vehicle model with the final target for reducing the center of gravity height. The difference between the final target for reducing the center of gravity height and the ground line elevation of the new vehicle model needs to be achieved by adjusting the reduction of the center of gravity coordinates of the new vehicle model.

[0133] Given that the final objective for the reduction in centroid height is hg3-h x The height of the new model is 3mm. However, by shortening the length of the damping spring or reducing the stiffness of the damping spring, the distance between the origin of the coordinate system (0,0,0) of the new model and the ground line of the new model can only be reduced from h0 = 322mm to h0 = 320mm. That is, the ground line of the new model is raised by △h = 2mm. This is still 1mm away from the final target of 3mm reduction in the center of gravity height. Therefore, it is necessary to adjust the reduction of the center of gravity coordinate of the new model to reduce the current center of gravity height of the new model by another 1mm.

[0134] S823. Adjust the reduction in the center of gravity coordinate of the newly developed model by reducing the height of the body configuration or the weight of the powertrain.

[0135] By reducing the height of the vehicle body or the weight of the powertrain, the required reduction in the center of gravity coordinates of the newly developed model can be achieved, thus reaching the ultimate goal of reducing the center of gravity height and enabling accurate and efficient forward development of the vehicle's center of gravity.

[0136] Specifically, the center-of-gravity coordinate z-value of the newly developed vehicle model is decomposed into areas such as powertrain, chassis, body, interior and exterior trim, intelligent connectivity, and safety. The height of the center-of-gravity coordinate z-value can be reduced by adjusting the dimensions of some components. Therefore, it is necessary to confirm the feasibility of reducing the center-of-gravity coordinates of the components in the newly developed vehicle model based on the current coordinate situation, and to determine the possible reduction amounts Δz1, Δz2, ..., Δzn for each component. By combining the reduction amounts of the center-of-gravity coordinates of each component, the overall center-of-gravity coordinate of the newly developed vehicle model can be reduced.

[0137] Calculations show that the center of gravity (z-coordinate) of the newly developed vehicle is 339mm. Breaking this down, the center of gravity for powertrain components is 186.0mm, chassis components 88.4mm, body components 534.29mm, interior and exterior trim components 535.19mm, intelligent connectivity components 381.62mm, safety components 669.18mm, and fluid consumption 67.82mm. By reducing the body-in-white height by 10mm, the adjusted center of gravity for the body components becomes 524.29mm. This results in a 1mm reduction in the center of gravity of the newly developed vehicle compared to the current model, i.e., Δz = 1mm.

[0138] By raising the ground line of the newly developed vehicle by Δh = 2mm and lowering the center of gravity coordinate by Δz = 1mm, it is possible to reduce the second estimated center of gravity height of the newly developed vehicle by 3mm from the original height of hg3 = 668mm, thereby achieving the required center of gravity height h of the newly developed vehicle. x =665mm.

[0139] Embodiments of the present invention also provide a vehicle center of gravity determination device, such as... Figure 2 As shown, it includes: acquisition module 1, used to acquire the center of gravity height of the base model, the height of the base model, the height of the newly developed model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height;

[0140] Correction coefficient determination module 2 is connected to acquisition module 1. Correction coefficient determination module 2 is used to calculate and obtain the correction coefficient based on the height of the basic vehicle model and the height of the newly developed vehicle model.

[0141] The base vehicle center of gravity correction height determination module 3 is connected to the acquisition module 1 and the correction coefficient determination module 2 respectively. The base vehicle center of gravity correction height determination module 3 is used to correct the center of gravity height of the base vehicle according to the correction coefficient and calculate the center of gravity correction height of the base vehicle.

[0142] The first estimated center of gravity height determination module 4 for the newly developed model is connected to the acquisition module 1 and the center of gravity correction height determination module 3 for the basic model. The first estimated center of gravity height determination module 4 is used to calculate the first estimated center of gravity height of the newly developed model based on the center of gravity correction height of the basic model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height.

[0143] The vehicle center of gravity determination device according to an embodiment of the present invention applies the vehicle center of gravity determination method according to an embodiment of the present invention. Since the vehicle center of gravity determination method according to an embodiment of the present invention has the above-mentioned beneficial technical effects, the vehicle center of gravity determination device according to an embodiment of the present invention can obtain vehicle-level data such as the height of the newly developed model, body configuration, and powertrain from the early stage of vehicle project development. Using the base model as a reference, a correction coefficient is obtained to correct the center of gravity height of the base model. Then, based on the corrected center of gravity height of the base model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height, the first estimated center of gravity height of the newly developed model is calculated. Thus, it is possible to complete the rapid and accurate center of gravity prediction of the whole vehicle using limited vehicle-level data in the early stage of vehicle project development.

[0144] Those skilled in the art will understand that implementing all or part of the processes in the methods of the above embodiments can be accomplished by instructing related hardware with computer-readable instructions. These computer-readable instructions can be stored in a non-volatile readable storage medium or a volatile readable storage medium. When executed, these computer-readable instructions can include the processes of the embodiments of the methods described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0145] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0146] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for determining the center of gravity of a vehicle, characterized in that, Includes the following steps: Obtain the center of gravity height of the base model, the height of the base model, the height of the newly developed model, the parameters of the influence of body configuration on the center of gravity height, and the parameters of the influence of powertrain on the center of gravity height; The correction coefficient is calculated based on the height of the base vehicle and the height of the newly developed vehicle. The center of gravity height of the base vehicle is corrected according to the correction coefficient, and the corrected center of gravity height of the base vehicle is calculated. Based on the base model's center of gravity correction height, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height, the first estimated center of gravity height of the newly developed model is calculated. The step of calculating the correction coefficient based on the height of the base vehicle model and the height of the newly developed vehicle model includes: The correction coefficient is obtained based on the ratio of the height of the newly developed vehicle model to the height of the base vehicle model; The step of correcting the center of gravity height of the base vehicle model according to the correction coefficient, and calculating the corrected center of gravity height of the base vehicle model, includes: The corrected height of the center of gravity of the base vehicle is obtained by multiplying the center of gravity height of the base vehicle by the correction coefficient. The step of obtaining the parameters of the influence of the vehicle body configuration on the center of gravity height includes: Obtain the weight of the body configuration of the newly developed model and the weight of the body configuration of the base model. Based on the difference between the weight of the body configuration of the newly developed model and the weight of the body configuration of the base model, and the influence parameter of the body unit weight on the center of gravity height, calculate the influence parameter of the body configuration on the center of gravity height. The step of obtaining the parameters of the powertrain's influence on the center of gravity height includes: Obtain the powertrain type of the newly developed vehicle model and the powertrain type of the base vehicle model. Based on the powertrain type of the newly developed vehicle model and the powertrain type of the base vehicle model, obtain the influence parameters of the powertrain on the center of gravity height.

2. The method for determining the center of gravity of a vehicle according to claim 1, characterized in that, The calculation of the first estimated center of gravity height of the newly developed model based on the base model's center of gravity correction height, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height includes: The first estimated center of gravity height of the newly developed model is calculated based on the sum of the center of gravity correction height of the base model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height.

3. The method for determining the center of gravity of a vehicle according to claim 1, characterized in that, After calculating the first estimated center of gravity height of the newly developed vehicle model, the method further includes obtaining the primary target for the center of gravity height of the newly developed vehicle model and the primary target for the reduction in center of gravity height. The steps for obtaining the initial target for the center of gravity height and the initial target for the reduction in center of gravity height of the newly developed vehicle include: Obtain the required center of gravity height of the newly developed vehicle model, and calculate the initial target of the center of gravity height of the newly developed vehicle model and the initial target of the reduction in center of gravity height based on the first estimated center of gravity height of the newly developed vehicle model and the required center of gravity height of the newly developed vehicle model. When the first estimated center of gravity height of the newly developed vehicle is less than or equal to the required center of gravity height of the newly developed vehicle, the required center of gravity height of the newly developed vehicle shall be used as the primary target for the center of gravity height of the newly developed vehicle. When the first estimated center of gravity height of the newly developed model is greater than the required center of gravity height of the newly developed model, the required center of gravity height of the newly developed model is used as the primary target for the center of gravity height of the newly developed model, and the primary target for the reduction in center of gravity height is obtained based on the difference between the first estimated center of gravity height of the newly developed model and the required center of gravity height of the newly developed model.

4. The method for determining the center of gravity of a vehicle according to claim 3, characterized in that, After obtaining the initial target for the center of gravity height and the initial target for the reduction in center of gravity height of the newly developed vehicle model, the method further includes obtaining the second estimated center of gravity height of the newly developed vehicle model. The process of obtaining the second estimated center of gravity height of the newly developed vehicle includes: Obtain the weight of the components of the newly developed vehicle model and the coordinates of the center of gravity of the components. Based on the weight of the components and the coordinates of the center of gravity of the components, calculate the estimated coordinates of the center of gravity of the newly developed vehicle model. Obtain the ground line of the newly developed vehicle model, and calculate the second estimated center of gravity height of the newly developed vehicle model based on the distance between the estimated center of gravity coordinates of the newly developed vehicle model and the ground line of the newly developed vehicle model.

5. The method for determining the center of gravity of a vehicle according to claim 4, characterized in that, After obtaining the second estimated center of gravity height of the newly developed vehicle model, the method further includes: The final target for reducing the center of gravity is obtained based on the difference between the second estimated center of gravity height of the newly developed vehicle model and the required center of gravity height of the newly developed vehicle model.

6. The method for determining the center of gravity of a vehicle according to claim 5, characterized in that, After obtaining the final target for reducing the center of gravity height based on the difference between the second estimated center of gravity height of the newly developed model and the required center of gravity height of the newly developed model, the method further includes adjusting the actual center of gravity height of the newly developed model according to the final target for reducing the center of gravity height. The adjustment of the actual center of gravity height of the newly developed vehicle model according to the ultimate target of the reduction in center of gravity height includes: The ultimate target of reducing the centroid height is decomposed into the reduction of the centroid coordinate of the newly developed vehicle and the elevation of the ground line of the newly developed vehicle. The ultimate goal of reducing the center of gravity height is achieved by adjusting the amount of reduction in the center of gravity coordinates of the newly developed vehicle and / or the amount of elevation of the ground line of the newly developed vehicle.

7. The method for determining the center of gravity of a vehicle according to claim 6, characterized in that, The adjustment of the ground line elevation of the newly developed vehicle model includes: By shortening the length of the shock absorber springs in the newly developed vehicle model or increasing the stiffness of the shock absorber springs in the newly developed vehicle model, the distance between the origin of the coordinate system of the newly developed vehicle model and the ground line of the newly developed vehicle model is reduced, thereby adjusting the amount of ground line elevation of the newly developed vehicle model.

8. The method for determining the center of gravity of a vehicle according to claim 7, characterized in that, The adjustment of the reduction in the center of gravity coordinate of the newly developed vehicle includes: The reduction in the centroid coordinates of the newly developed vehicle is obtained based on the difference between the final target of the reduction in centroid height and the ground line elevation of the newly developed vehicle model. The reduction in the center of gravity coordinate of the newly developed model is adjusted by reducing the height of the body configuration or the weight of the powertrain.

9. A device for determining the center of gravity of a vehicle, characterized in that, include: The acquisition module is used to acquire the center of gravity height of the base model, the height of the base model, the height of the newly developed model, the parameters of the influence of body configuration on the center of gravity height, and the parameters of the influence of powertrain on the center of gravity height. A correction coefficient determination module is connected to the acquisition module, and the correction coefficient determination module is used to calculate and obtain the correction coefficient based on the height of the base vehicle model and the height of the newly developed vehicle model. A base vehicle center of gravity correction height determination module is provided, which is connected to the acquisition module and the correction coefficient determination module respectively. The base vehicle center of gravity correction height determination module is used to correct the center of gravity height of the base vehicle according to the correction coefficient and calculate the center of gravity correction height of the base vehicle. The module for determining the first estimated center of gravity height of the newly developed vehicle model is connected to the acquisition module and the module for determining the center of gravity correction height of the base vehicle model. The module is used to calculate the first estimated center of gravity height of the newly developed vehicle model based on the center of gravity correction height of the base vehicle model, the influence parameters of the body configuration on the center of gravity height, and the influence parameters of the powertrain on the center of gravity height. The step of calculating the correction coefficient based on the height of the base vehicle model and the height of the newly developed vehicle model includes: The correction coefficient is obtained based on the ratio of the height of the newly developed vehicle model to the height of the base vehicle model; The step of correcting the center of gravity height of the base vehicle model according to the correction coefficient, and calculating the corrected center of gravity height of the base vehicle model, includes: The corrected height of the center of gravity of the base vehicle is obtained by multiplying the center of gravity height of the base vehicle by the correction coefficient. The step of obtaining the parameters of the influence of the vehicle body configuration on the center of gravity height includes: Obtain the weight of the body configuration of the newly developed model and the weight of the body configuration of the base model. Based on the difference between the weight of the body configuration of the newly developed model and the weight of the body configuration of the base model, and the influence parameter of the body unit weight on the center of gravity height, calculate the influence parameter of the body configuration on the center of gravity height. The step of obtaining the parameters of the powertrain's influence on the center of gravity height includes: Obtain the powertrain type of the newly developed vehicle model and the powertrain type of the base vehicle model. Based on the powertrain type of the newly developed vehicle model and the powertrain type of the base vehicle model, obtain the influence parameters of the powertrain on the center of gravity height.

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