An apparatus and method for calibrating a torque test structure of an automotive powertrain

Abstract

The present invention discloses a calibration device and a calibration method for an automotive powertrain torque test structure, which relates to the technical field of automotive powertrain calibration. It includes a support platform and a support for supporting and fixing. A coupling plate is installed on the support through a pair of pillow block spherical roller bearings. The top of the coupling plate is symmetrically hung with a weight tray through a calibration arm. The drive shaft torque test structure is installed through a drive shaft support platform end connector and a drive shaft support end connector, and the flywheel torque test structure is installed through a flywheel support platform end connector and a flywheel support end connector. The calibration device and calibration method of the present invention realize the pure mechanical loading of torque by adding weights to the weight tray. The operation is simple and no external energy is required, which greatly simplifies the structure of the calibration device, reduces the complexity of the calibration operation, can effectively and quickly obtain the high-precision calibration curves and calibration coefficients of the drive shaft and the flywheel torque. At the same time, it is not only conducive to the control of experimental costs, but also conducive to the protection of the resource environment.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive driveline calibration, and particularly relates to a calibration device and a calibration method for torque testing of an automotive driveline. Background Art

[0002] The torque of an automotive driveline is key information for research such as the testing of the vehicle's overall energy flow and the characterization of the vehicle's reliability. The driveline torque test structure is used to obtain the driveline torque in real time, including a drive shaft torque test structure and a flywheel torque test structure. Before using the driveline torque test structure, it is first necessary to determine the relationship between the torsional output voltage of the test structure and the torque through a calibration test. The calibration test conducted by the calibration device can obtain the calibration curve of the output voltage and torque of the test structure, providing reference conditions for real vehicle testing.

[0003] Existing calibration devices mainly include motor-loaded torque test benches, lever-loaded torque test benches, etc. Although these calibration devices can basically meet the needs of calibration tests, there are also some problems, such as complex structures, large volumes, high costs, single calibration objects, poor interchangeability, and complex experimental processes.

[0004] Through a search of the prior art, the following known technical solutions exist:

[0005] Prior Art 1:

[0006] Application No.: CN201120449770.6, Application Date: November 15, 2011, Publication (Announcement) Date: July 25, 2012. This prior art discloses a general-purpose and precise torque measurement calibration device, including weights, a weight tray, and a torque meter. The torque measurement calibration device further includes a calibration arm, a torque meter fixing fork, a fork fixing seat, and a seat block. Torque meter fixing forks are fixed on both sides of the torque meter, a fork fixing seat connected to the torque meter fork, and a seat block that adjusts displacement along the fork fixing seat. Calibration arms are provided at both ends of the top of the torque meter, and the calibration arms are connected to the weight tray for placing weights. The utility model is a general-purpose and precise torque measurement calibration device with an adjustable horizontal position of the calibration arm. The utility model can fix its position after a one-time calibration before use to repeatedly achieve the purpose of accurately installing the calibration arm horizontally, is applicable to various test benches, has strong versatility, is convenient, and has high precision. However, this prior art does not have interchangeability.

[0007] Prior Art 2:

[0008] Application No.: CN202010774597.0, Application Date: August 4, 2020, Publication (Announcement) Date: October 27, 2020. This prior art discloses a half - shaft torque calibration device and its working method, including a base. At both ends of the rear end of the top of the base, there are slide rails. A balance trolley is slidably connected in the slide rails. In the middle of the bottom of the balance trolley, a hydraulic device is fixedly installed. In the middle of the bottom of the hydraulic device, a fixed shaft is slidably connected. The top of the balance trolley is fixedly connected with a connecting seat. At the front end of the top of the connecting seat, a support back plate is fixedly connected. At the lower part of the rear side of the support back plate, a fixed rib plate is fixedly connected. At the upper part of the front end of the support back plate, the outer ring of a support bearing is rotatably connected. The inner ring of the support bearing is fixedly connected with a connecting shaft. The half - shaft torque calibration device and its working method of the present invention use a balance trolley and an electric dynamometer to conduct a half - shaft calibration test on the half - shaft. The overall structure is simpler than that of a half - shaft calibration testing machine. Moreover, this device is installed on the base, and the floor area of the base is relatively small. And after use, the whole device can be disassembled. However, the structure of this prior art is too complex and does not have interchangeability.

[0009] Through the above retrieval, it is found that the above technical solutions do not affect the novelty of the present invention; and the combination of the above prior arts does not destroy the creativity of the present invention. Summary of the Invention

[0010] The present invention precisely aims to avoid the deficiencies of the above - mentioned prior art and provides a calibration device and a calibration method for the torque test structure of an automotive powertrain.

[0011] The present invention adopts the following technical solutions to solve the technical problems: A calibration device for the torque test structure of an automotive powertrain, where a support platform and a support are installed and fixed on a platform. A pair of pillow block spherical bearings are installed and fixed on the top of the support platform. This pair of pillow block spherical bearings are coaxially arranged, and their axes are horizontal and intersect with the support platform. The coupling plate is in a cylindrical structure and is rotatably installed on the pair of pillow block spherical bearings. The column of the calibration arm is installed and fixed on the top of the coupling plate. The axis direction of the cross - arm of the calibration arm is horizontal and is spatially perpendicular to the axis of the pillow block spherical bearing. A pair of weight pans are symmetrically hung at both ends of the cross - arm.

[0012] Furthermore, it further includes a drive - shaft torque test structure whose two ends are respectively installed and connected to the coupling plate and the support through a drive - shaft support - platform end connector and a drive - shaft support - end connector. The drive - shaft torque test structure includes a drive shaft and a drive - shaft torque sensor assembly. The drive - shaft torque sensor assembly is integrated onto the shaft rod of the drive shaft through a bushing. The two ends of the drive - shaft torque test structure are provided with external splines.

[0013] The connecting member at the support end of the drive shaft has a disc structure with a positioning post and a columnar protrusion respectively provided in the middle of both sides. This disc structure is fixedly installed with one end of the coupling plate facing the support. The positioning post is inserted into the positioning post hole opened at the end of one end of the coupling plate facing the support and can rotate around its own axis in the positioning post hole; the connecting member at the support end of the drive shaft has a disc structure with a columnar protrusion in the middle. This disc structure is fixedly installed with the support; internal splines are opened at the ends of the columnar protrusions of the connecting member at the support end of the drive shaft and the connecting member at the support end of the drive shaft. The external splines at both ends of the drive shaft torque testing structure are respectively connected and matched with the internal splines opened at the ends of the two columnar protrusions;

[0014] The drive shaft torque testing structure, the connecting member at the support end of the drive shaft, and the connecting member at the support end of the drive shaft are all coaxially arranged with the pillow block spherical bearing.

[0015] Further, the side wall of the columnar protrusion of the connecting member at the support end of the drive shaft is flattened into a planar structure. Arc-shaped holes are opened on the disc structure of the connecting member at the support end of the drive shaft, and a positioning slip ring with an annular protrusion structure is provided in the middle of the end facing the support. Corresponding arc-shaped holes and a positioning ring groove are opened on the support; the positioning slip ring is fitted and clamped into the positioning ring groove and can rotate around its own axis in the positioning ring groove; the disc structure of the connecting member at the support end of the drive shaft and the support are connected and fixed through threaded connectors at each of the arc-shaped holes.

[0016] Further, it further includes a flywheel torque testing structure respectively installed and connected to the coupling plate and the support through a flywheel support end connecting member and a flywheel support end connecting member. The flywheel torque testing structure includes a flywheel and a flywheel torque sensor assembly. The flywheel torque sensor assembly is integrated on the surface of the primary mass flywheel of the flywheel. The secondary mass flywheel of the flywheel is provided with internal splines;

[0017] The flywheel support end connecting member has a disc structure with a positioning post in the middle. This disc structure is fixedly installed with one end of the coupling plate facing the support and the primary mass flywheel. The positioning post is inserted into the positioning post hole opened at the end of one end of the coupling plate facing the support and can rotate around its own axis in the positioning post hole; the flywheel support end connecting member has a disc structure with a columnar protrusion in the middle. This disc structure is fixedly installed with the support. The columnar protrusion is connected and matched with the internal splines of the secondary mass flywheel through the external splines provided at its end;

[0018] The flywheel torque testing structure, the flywheel support end connecting member, and the flywheel support end connecting member are all coaxially arranged with the pillow block spherical bearing.

[0019] Further, the side wall of the columnar protrusion of the flywheel support end connector is flattened into a planar structure. Each arc-shaped hole is formed in the disc-shaped structure of the flywheel support end connector, and a positioning slip ring with an annular protrusion structure is arranged in the middle of one end facing the support. Each arc-shaped hole is correspondingly formed in the support, and a positioning ring groove is correspondingly formed; the positioning slip ring is fitted and clamped into the positioning ring groove and can rotate around its own axis in the positioning ring groove. The disc-shaped structure of the flywheel support end connector and the support are connected and fixed through each threaded connector at each arc-shaped hole.

[0020] Further, a mounting plate is fixedly installed on the top of the coupling plate. A positioning pin is arranged on the top of the mounting plate. The bottom end of the column is fixedly connected with a bottom flat plate. The bottom flat plate is fixedly installed with the mounting plate, and a positioning hole formed therein is in fit connection with the positioning pin.

[0021] Further, a clip is further included. The clip has a plate-shaped structure and is located at one end of the coupling plate away from the support. The bottom of the clip is fixedly installed on the support platform, and a limiting hole is formed in the top. The limiting hole is in fit connection with a limiting platform arranged at one end of the coupling plate away from the support to limit the rotation of the coupling plate.

[0022] Further, the calibration arm as a whole has a symmetrical triangular frame structure, and its column is the symmetry line of the triangular frame structure. Triangular pyramids are arranged at both ends of the cross arm of the calibration arm, and a flat plate is arranged at the top. A level is installed on the flat plate; the two weight pans are respectively hung on the two triangular pyramids.

[0023] A method for calibrating the torque of an automotive drive shaft uses the above-mentioned torque test structure calibration device for an automotive powertrain to calibrate the torque of the automotive drive shaft. The calibration method includes the following steps:

[0024] A1. Collect the initial zero position V of the drive shaft torque test structure when it is not torsionally loaded through the data acquisition module of the drive shaft torque sensor assembly 轴0 ;

[0025] A2. Insert the positioning column of the drive shaft support end connector into the positioning column hole at the end of the coupling plate, and fixedly install the disc-shaped structure of the drive shaft support end connector and the end of the coupling plate through each threaded connector; subsequently, fit and connect the external spline at one end of the drive shaft torque test structure with the internal spline formed at the end of the columnar protrusion of the drive shaft support end connector;

[0026] A3. Fit the positioning slip ring of the driving shaft support end connecting piece into the positioning ring groove on the support, pre-assemble each threaded connecting piece at the corresponding curved arc holes of the driving shaft support end connecting piece and the support, and pre-connect the driving shaft support end connecting piece and the support; subsequently, lay the driving shaft of the driving shaft torque test structure flat, and according to the position of the external spline at the other end of the driving shaft torque test structure, rotate and adjust the driving shaft support end connecting piece relative to the driving shaft torque test structure and the support to a suitable position, and connect the external spline at the other end of the driving shaft torque test structure with the internal spline opened at the end of the columnar protrusion of the driving shaft support end connecting piece;

[0027] A4. Fit the wrench onto the flattened side wall outside the columnar protrusion of the driving shaft support end connecting piece, and rotate the driving shaft support end connecting piece through the wrench to eliminate the assembly clearance between the driving shaft torque test structure and the driving shaft support platform end connecting piece and the driving shaft support end connecting piece; subsequently, tighten each pre-assembled threaded connecting piece to install and fix the driving shaft support end connecting piece and the support;

[0028] During this process, the calibration arm also rotates with the coupling plate and the driving shaft support platform end connecting piece, and this rotation angle is ɑ 轴1 ;

[0029] A5. Hang a pair of weight pans on both ends of the cross arm of the calibration arm. According to the inclination of the cross arm, add weights to one of the weight pans accordingly to make the cross arm rotate to the horizontal position and maintain for a set time t 轴 , record the mass M of the added weights at this time 轴1 and the set time t 轴 and the voltage value group {V 轴1} output by the driving shaft torque sensor assembly within;

[0030] A6. Loosen each threaded connecting piece in each of the curved arc holes, fit the wrench onto the flattened side wall outside the columnar protrusion of the driving shaft support end connecting piece, rotate the driving shaft support end connecting piece through the wrench again, and then, tighten each loosened threaded connecting piece to install and fix the driving shaft support end connecting piece and the support; during this process, the calibration arm also rotates with the coupling plate and the driving shaft support platform end connecting piece, and this rotation angle is ɑ 轴2 , and then obtain the mass M of the added weights in the same way as in A5 轴2 and the voltage value group {V 轴2};

[0031] A7. Repeat the process of A6 to successively obtain M 轴3 and {V 轴3}, M 轴4 and {V轴4}...M 轴n and {V 轴n};

[0032] A8. Obtain the torque T applied to the drive shaft torque test structure during each operation among A5 to A7 according to Equation 1 轴n ;

[0033] T 轴n = L × M 轴n × g (Equation 1)

[0034] where L is the lever arm length of the weight gravity acting on the centroid of the coupling plate, g is the acceleration due to gravity, and n = 1, 2,...;

[0035] A9. Process {V 轴1}, {V 轴2}... {V 轴n} to obtain V 轴1 , V 轴2 ... V 轴n . The processing process for a single voltage value group is to subtract each voltage value in the voltage value group from V 轴0 and average them;

[0036] A10. Fit the calibration curve of the drive shaft torque test structure as Equation 2 according to (V 轴1 , T 轴1 ), (V 轴2 , T 轴2 ),... (V 轴n , T 轴n ):

[0037] T 轴 = k 轴 V 轴 + b 轴 (Equation 2)

[0038] where k 轴 and b 轴 are both constants obtained by fitting;

[0039] A11. Calculate the linearity error δ between the actual measurement results of each group and the calibration curve of the drive shaft torque test structure obtained by fitting according to Equation 3 轴1 , δ 轴2 ... δ 轴n ;

[0040] (Equation 3)

[0041] where n = 1, 2... n;

[0042] Subsequently, compare δ 轴 with δ轴0 Size:

[0043] If δ 轴 < δ 轴 , then the drive shaft torque test structure meets the development requirements;

[0044] Otherwise, the drive shaft torque test structure does not meet the development requirements;

[0045] Wherein, δ 轴 = max{δ 轴1 , δ 轴2 ... δ 轴n}, and δ 轴0 is the set allowable linearity error.

[0046] A method for calibrating the torque of an automotive flywheel uses the above-mentioned torque test structure calibration device for the automotive powertrain to calibrate the torque of the automotive flywheel. This calibration method includes the following steps:

[0047] B1. Collect the initial zero position V 轮0 of the flywheel torque test structure when it is not under torsion through the data acquisition module of the flywheel torque sensor assembly;

[0048] B2. Insert the positioning post of the flywheel support end connecting piece into the positioning post hole at the end of the coupling plate, and install and fix the disc-shaped structure of the flywheel support end connecting piece, the end of the coupling plate, and the primary mass flywheel of the flywheel torque test structure through each threaded connecting piece;

[0049] B3. The positioning slip ring of the flywheel support end connecting piece is fitted and clamped into the positioning ring groove on the support. At each arc-shaped hole of the flywheel support end connecting piece and the support, pre-install each threaded connecting piece and pre-connect the flywheel support end connecting piece with the support; Subsequently, according to the internal spline position of the secondary mass flywheel, rotate and adjust the flywheel support end connecting piece relative to the flywheel torque test structure to a suitable position, and connect the external spline provided at the end of the columnar protrusion of the flywheel support end connecting piece with the internal spline of the secondary mass flywheel;

[0050] B4. Fit and clamp a wrench to the flattened side wall outside the columnar protrusion of the flywheel support end connecting piece, and rotate the flywheel support end connecting piece through the wrench to eliminate the assembly gap between the flywheel torque test structure and the flywheel support end connecting piece and the flywheel support end connecting piece, and the relative displacement deflection angle between the primary mass flywheel and the secondary mass flywheel of the flywheel torque test structure; Subsequently, tighten each pre-installed threaded connecting piece and install and fix the flywheel support end connecting piece with the support;

[0051] During this process, the calibration arm also rotates with the coupling plate and the flywheel support end connecting piece, and the rotation angle is ɑ 轮1 ;

[0052] B5. Hang a pair of weight pans on both ends of the cross arm of the calibration arm. According to the inclination of the cross arm, add weights to one of the weight pans accordingly, and rotate the cross arm to the horizontal position and maintain the set time t. 轮 Record the mass M of the added weights at this time. 轮1 and the set time t. 轮 and the set of voltage values {V 轮1} output by the flywheel torque sensor assembly within;

[0053] B6. Loosen each of the threaded connectors in the bent arc holes, fit the wrench to the outside of the flattened side wall of the columnar protrusion of the flywheel support end connector, and rotate the flywheel support end connector again through the wrench. Subsequently, tighten each of the loosened threaded connectors to fix the flywheel support end connector to the support; during this process, the calibration arm also rotates with the coupling plate and the flywheel support platform end connector, and this rotation angle is ɑ. 轮2 Then, use the method of B5 to correspondingly obtain the mass M of the added weights. 轮2 and the set of voltage values {V 轮2} output by the drive shaft torque sensor assembly;

[0054] B7. Repeat the process of B6 to successively obtain M 轮3 and {V 轮3}, M 轮4 and {V 轮4}... M 轮n and {V 轮n};

[0055] B8. According to Equation 4, obtain the torque T received by the flywheel torque test structure during each operation process from B5 to B7. 轮n ;

[0056] T 轮n = L × M 轮n × g (Equation 4)

[0057] where L is the lever arm length of the weight gravity acting on the center of gravity of the coupling plate, g is the acceleration due to gravity, and n = 1, 2,...;

[0058] B9. Process {V 轮1}, {V 轮2}... {V 轮n} to obtain V 轮1 , V 轮2 ... V 轮n . The processing process for a single set of voltage values is to subtract each voltage value in the set of voltage values from V 轮0 and average them;

[0059] B10. The calibration curve of the flywheel torque test structure is obtained by fitting according to (V 轮1 , T 轮1 ), (V 轮2 , T 轮2 )... (V 轮n , T 轮n ) as Equation Five:

[0060] T 轮 = k 轮 V 轮 + b 轮 (Equation Five)

[0061] where k 轮 and b 轮 are both constants obtained by fitting;

[0062] B11. The linearity errors δ 轮1 , δ 轮2 ... δ 轮n of each group of actual measurement results and the calibration curve of the flywheel torque test structure obtained by fitting are calculated according to Equation Six;

[0063] (Equation Six)

[0064] where n = 1, 2,...;

[0065] Subsequently, compare the magnitudes of δ 轮 and δ 轮0 :

[0066] If δ 轮 < δ 轮0 , then the flywheel torque test structure meets the development requirements;

[0067] Otherwise, the flywheel torque test structure does not meet the development requirements;

[0068] where δ 轮 = max{δ 轮1 , δ 轮2 ... δ 轮n}, and δ 轮0 is the set allowable linearity error.

[0069] The present invention provides an automobile powertrain torque test structure calibration device and calibration method, having the following beneficial effects:

[0070] 1. The calibration device and method of the present invention achieve pure mechanical loading of torque by adding weights to the weight pan. The operation is simple and no external energy is required, greatly simplifying the structure of the calibration device, reducing the complexity of the calibration operation, and being able to effectively and quickly obtain high-precision calibration curves and calibration coefficients for the drive shaft and flywheel torque. At the same time, it is not only conducive to the control of experimental costs but also conducive to the protection of the resource environment;

[0071] 2. The inherent system error of the calibration device of the present invention is small. The pillow block spherical roller bearing can effectively eliminate the influence caused by bending moment to ensure that the force loading form during calibration is pure torque loading. At the same time, the pillow block spherical surface has a self-aligning function, which is conducive to ensuring the coaxiality of the coupling plate and the drive shaft support end connecting piece, the drive shaft support end connecting piece and the drive shaft torque test structure, or the coupling plate and the flywheel support end connecting piece, the flywheel support end connecting piece and the flywheel torque test structure, thereby improving the calibration accuracy;

[0072] 3. The calibration device of the present invention can be connected and tested with different test structures by cooperating with different support end connecting pieces and support end connecting pieces, and can be applied to the testing of various rotating structures, having good interchangeability;

[0073] 4. The calibration device of the present invention has a simple structure and a small volume, can be disassembled and stored, and has low requirements for the operation space of the working site and the storage space, further saving the development cost and contributing to the progress of the R & D work and the development of the torque test structure of the transmission system and similar rotating structures;

[0074] 5. After the installation of the drive shaft torque test structure or the flywheel torque test structure, the calibration device and method of the present invention continue to rotate the drive shaft support end connecting piece or the flywheel support end connecting piece through the flattened side wall of the columnar protrusion of the drive shaft support end connecting piece or the flywheel support end connecting piece to eliminate the assembly clearance between the drive shaft torque test structure and the drive shaft support end connecting piece and the drive shaft support end connecting piece, or the relative displacement deviation angle between the flywheel torque test structure and the flywheel support end connecting piece, the flywheel support end connecting piece, the primary mass flywheel and the secondary mass flywheel, further improving the calibration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0075] Figure 1 is a schematic structural diagram of the present invention;

[0076] Figure 2 is a partial structural schematic diagram of the present invention for installing the drive shaft torque test structure;

[0077] Figure 3 is a sectional structural schematic diagram of the A - A section of the present invention;

[0078] Figure 4 is a partial structural schematic diagram of the present invention for installing the flywheel torque test structure;

[0079] Figure 5 This is the schematic cross-sectional structure diagram at B-B of the present invention.

[0080] In the figure:

[0081] 1. Weight pan, 2. Calibration arm, 3. Platform, 4. Clip, 5. Support platform, 6. Coupling plate, 7. Pillow block spherical roller bearing, 8. Support, 9. Connecting member at the support end of the drive shaft, 10. Connecting member at the support end of the drive shaft seat, 11. Drive shaft torque test structure, 12. Connecting member at the support end of the flywheel, 13. Connecting member at the support end of the flywheel seat, 14. Flywheel torque test structure. Specific embodiments

[0082] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0083] As Figures 1 to 3 shown, the structural relationship of the calibration device for the torque test structure of the automotive powertrain is as follows: The support platform 5 and the support 8 are installed and fixed on the platform 3. A pair of pillow block spherical roller bearings 7 are installed and fixed on the top of the support platform 5. This pair of pillow block spherical roller bearings 7 are coaxially arranged, and their axes are horizontal and intersect with the support platform 5; The coupling plate 6 has a cylindrical structure and is rotatably installed on a pair of pillow block spherical roller bearings 7. The two pillow block spherical roller bearings 7 can eliminate the influence caused by bending moment, and the pillow block spherical roller bearings 7 have a self-aligning function, which can compensate for the non-coincidence of the axes caused by installation errors and the deformation of the installation bottom surface, improving the measurement accuracy; The column of the calibration arm 2 is installed and fixed on the top of the coupling plate 6. The axis direction of the cross arm of the calibration arm 2 is horizontal and is perpendicular to the axis of the pillow block spherical roller bearing 7 in space; A pair of weight pans 1 are symmetrically hung at both ends of the cross arm.

[0084] Preferably, it further includes a drive shaft torque test structure 11 whose two ends are respectively installed and connected to the coupling plate 6 and the support 8 through a connecting member at the support end of the drive shaft 9 and a connecting member at the support end of the drive shaft seat 10. The drive shaft torque test structure 11 includes a drive shaft and a drive shaft torque sensor assembly. The drive shaft torque sensor assembly is integrated onto the shaft rod of the drive shaft through a bushing. The two ends of the drive shaft torque test structure 11 are provided with external splines;

[0085] The driving shaft support end connecting member 9 has a disc structure with a positioning post and a columnar protrusion respectively provided in the middle of both sides. This disc structure is fixedly installed at one end of the coupling plate 6 facing the support 8. The positioning post is inserted into the positioning post hole opened at the end of one end of the coupling plate 6 facing the support 8 and can rotate around its own axis in the positioning post hole; the driving shaft support end connecting member 10 has a disc structure with a columnar protrusion in the middle. This disc structure is fixedly installed with the support 8; internal splines are opened at the ends of the columnar protrusions of the driving shaft support end connecting member 9 and the driving shaft support end connecting member 10, and the external splines at both ends of the driving shaft torque testing structure 11 are respectively connected and matched with the internal splines opened at the ends of the two columnar protrusions;

[0086] The driving shaft torque testing structure 11, the driving shaft support end connecting member 9, and the driving shaft support end connecting member 10 are all coaxially arranged with the pillow block spherical roller bearing 7.

[0087] Preferably, the side wall of the columnar protrusion of the driving shaft support end connecting member 10 is flattened into a planar structure. Arc-shaped holes are opened on the disc structure of the driving shaft support end connecting member 10, and a positioning sliding ring with an annular protrusion structure is provided in the middle of the end facing the support 8. Corresponding arc-shaped holes and positioning ring grooves are opened on the support 8; the positioning sliding ring is fitted and clamped into the positioning ring groove and can rotate around its own axis in the positioning ring groove; the disc structure of the driving shaft support end connecting member 10 and the support 8 are fixedly connected through respective threaded connectors at the arc-shaped holes; when installing the driving shaft torque testing structure 11, a wrench can be fitted and clamped outside the columnar protrusion, and the driving shaft support end connecting member 10 can be rotated through the wrench to eliminate the assembly clearance between the driving shaft torque testing structure 11, the driving shaft support end connecting member 9, and the driving shaft support end connecting member 10, and improve the calibration accuracy; the setting of the arc-shaped holes enables the driving shaft support end connecting member 10 to still be fixedly connected with the support 8 through respective threaded connectors after rotating relative to the support 8 during the process of eliminating the assembly clearance.

[0088] Preferably, a mounting plate is fixedly installed on the top of the coupling plate 6. A positioning pin is provided on the top of the mounting plate. The bottom end of the column is fixedly connected with a bottom flat plate. The bottom flat plate is fixedly installed with the mounting plate, and the positioning hole opened thereon is connected and matched with the positioning pin; the setting of the positioning pin and the positioning hole is used to ensure the symmetry of the calibration arm 2 with respect to the pillow block spherical roller bearing 7 when the calibration arm 2 is installed on the top of the coupling plate 6.

[0089] Preferably, it further includes a clip 4. The clip 4 has a plate-like structure and is located at the end of the coupling plate 6 away from the support 8. The bottom of the clip 4 is fixedly installed on the support platform 5, and a limiting hole is opened at the top. This limiting hole is fitted and clamped with a limiting platform provided at the end of the coupling plate 6 away from the support 8 and restricts the rotation of the coupling plate 6.

[0090] Preferably, the calibration arm 2 is integrally in the shape of a symmetric tripod structure, with its vertical column being the symmetry line of the tripod structure. Triangular pyramids are provided at both ends of the cross arm of the calibration arm 2, and a flat plate is provided at the top. A level is installed on the flat plate; the two weight pans 1 are respectively hung on the two triangular pyramids.

[0091] A method for calibrating the torque of an automotive drive shaft uses the above-mentioned calibration device for the torque test structure of the automotive powertrain to calibrate the torque of the automotive drive shaft. This calibration method includes the following steps:

[0092] A1, collecting the initial zero position V of the drive shaft torque test structure 11 when not subjected to torsion through the data acquisition module of the drive shaft torque sensor assembly 轴0 ;

[0093] A2, inserting the positioning post of the drive shaft support end connector 9 into the positioning post hole at the end of the coupling plate 6, and installing and fixing the disc-shaped structure of the drive shaft support end connector 9 to the end of the coupling plate 6 through each threaded connector; subsequently, fitting and connecting the external spline at one end of the drive shaft torque test structure 11 with the internal spline provided at the end of the columnar protrusion of the drive shaft support end connector 9.

[0094] A3, fitting and clamping the positioning slip ring of the drive shaft support end connector 10 into the positioning ring groove on the support 8, pre-installing each threaded connector at the respective arc-shaped holes of the drive shaft support end connector 10 and the support 8, and pre-connecting the drive shaft support end connector 10 with the support 8; subsequently, laying the drive shaft of the drive shaft torque test structure 11 flat, and according to the position of the external spline at the other end of the drive shaft torque test structure 11, rotating and adjusting the drive shaft support end connector 10 relative to the drive shaft torque test structure 11 and the support 8 to a suitable position, and fitting and connecting the external spline at the other end of the drive shaft torque test structure 11 with the internal spline provided at the end of the columnar protrusion of the drive shaft support end connector 10.

[0095] A4, fitting and clamping the wrench to the external flattened side wall of the columnar protrusion of the drive shaft support end connector 10, and rotating the drive shaft support end connector 10 through the wrench to eliminate the assembly gap between the drive shaft torque test structure 11 and the drive shaft support end connector 9 and the drive shaft support end connector 10; subsequently, tightening each pre-installed threaded connector to install and fix the drive shaft support end connector 10 with the support 8.

[0096] During this process, the calibration arm 2 also rotates with the coupling plate 6 and the drive shaft support end connector 9, and this rotation angle is ɑ 轴1 ;

[0097] A5, hanging a pair of weight pans 1 on both ends of the cross arm of the calibration arm 2, and adding weights to one of the weight pans 1 according to the inclination of the cross arm to make the cross arm rotate to the horizontal position and maintain for a set time t 轴, record the mass M of the added weights at this time 轴1 and the set time t 轴 the voltage value group {V output by the drive shaft torque sensor assembly within 轴1};

[0098] A6. Loosen each threaded connection in the bent arc holes, fit the wrench to the outside of the flattened side wall of the columnar protrusion of the connecting part at the end of the drive shaft support, and rotate the connecting part at the end of the drive shaft support 10 again through the wrench. Subsequently, tighten the loosened threaded connections to fix the connecting part at the end of the drive shaft support 10 to the support 8; during this process, the calibration arm 2 also rotates following the coupling plate 6 and the connecting part at the end of the drive shaft support platform 9, and this rotation angle is ɑ 轴2 , and then obtain the mass M of the added weights in the corresponding manner of A5 轴2 and the voltage value group {V output by the drive shaft torque sensor assembly 轴2};

[0099] A7. Repeat the process of A6 to successively obtain M 轴3 and {V 轴3}, M 轴4 and {V 轴4}... M 轴n and {V 轴n};

[0100] A8. Obtain the torque T received by the drive shaft torque test structure 11 during each operation process in A5 - A7 according to Equation 1 轴n ;

[0101] T 轴n = L×M 轴n ×g (Equation 1)

[0102] where L is the lever arm length of the weight's gravity acting on the center of gravity of the coupling plate, g is the acceleration due to gravity, and n = 1, 2,...;

[0103] A9. Process {V 轴1}, {V 轴2}... {V 轴n} to obtain V 轴1 , V 轴2 ... V 轴n . The processing process for a single voltage value group is to subtract each voltage value in the voltage value group by V 轴0 and average them;

[0104] A10. According to (V 轴1 , T 轴1 ), (V 轴2 , T 轴2 )... (V 轴n , T 轴n) The calibrated curve of the drive shaft torque test structure 11 obtained by fitting is as shown in Equation (2):

[0105] T 轴 =k 轴 V 轴 +b 轴 (Equation (2))

[0106] where k 轴 and b 轴 are both constants obtained by fitting;

[0107] A11, the linearity error δ between the actual measurement results of each group calculated according to Equation (3) and the calibrated curve of the drive shaft torque test structure 11 obtained by fitting 轴1 、δ 轴2 ……δ 轴n ;

[0108] (Equation (3))

[0109] where n = 1, 2, ……;

[0110] Subsequently, compare the magnitudes of δ 轴 and δ 轴0 :

[0111] If δ 轴 < δ 轴 , then the drive shaft torque test structure 11 meets the development requirements;

[0112] Otherwise, the drive shaft torque test structure 11 does not meet the development requirements;

[0113] where δ 轴 = max{δ 轴1 、δ 轴2 ……δ 轴n}, and δ 轴0 is the set allowable linearity error. Embodiment

[0114] Such as Figure 1 、 Figures 4 to 5As shown in the figure, the structural relationship of the torque test structure calibration device for an automotive powertrain is as follows: The support platform 5 and the support 8 are installed and fixed on the platform 3. A pair of pillow block spherical roller bearings 7 are installed and fixed on the top of the support 8. This pair of pillow block spherical roller bearings 7 are coaxially arranged, and their axes are horizontal and intersect with the support 8. The coupling plate 6 has a cylindrical structure and is rotatably installed on a pair of pillow block spherical roller bearings 7. The two pillow block spherical roller bearings 7 can eliminate the influence caused by bending moment, and the pillow block spherical roller bearings 7 have a self-aligning function, which can compensate for the non-coincidence of the axes caused by installation errors and the deformation of the installation bottom surface, thereby improving the measurement accuracy. The column of the calibration arm 2 is installed and fixed on the top of the coupling plate 6. The axis direction of the cross arm of the calibration arm 2 is horizontal and is spatially perpendicular to the axis of the pillow block spherical roller bearings 7. A pair of weight pans 1 are symmetrically hung at both ends of the cross arm.

[0115] Preferably, it further includes a flywheel torque test structure 14 which is respectively installed and connected to the coupling plate 6 and the support 8 through a flywheel support platform end connecting member and a flywheel support end connecting member 13. The flywheel torque test structure 14 includes a flywheel and a flywheel torque sensor assembly. The flywheel torque sensor assembly is integrated on the surface of the primary mass flywheel of the flywheel. The secondary mass flywheel of the flywheel is provided with an internal spline.

[0116] The flywheel support platform end connecting member has a disc-shaped structure with a positioning post in the middle. This disc-shaped structure is installed and fixed to the end of the coupling plate 6 facing the support 8 and the primary mass flywheel. The positioning post is inserted into the positioning post hole opened at the end of the end of the coupling plate 6 facing the support 8 and can rotate around its own axis in the positioning post hole. The flywheel support end connecting member 13 has a disc-shaped structure with a cylindrical protrusion in the middle. This disc-shaped structure is installed and fixed to the support 8. The cylindrical protrusion is connected to the internal spline of the secondary mass flywheel through an external spline provided at its end.

[0117] The flywheel torque test structure 14, the flywheel support platform end connecting member, and the flywheel support end connecting member 13 are all coaxially arranged with the pillow block spherical roller bearings 7.

[0118] Preferably, the side wall of the cylindrical protrusion of the flywheel support end connecting member 13 is flattened into a planar structure. The disc-shaped structure of the flywheel support end connecting member 13 is provided with arc-shaped holes, and a positioning slip ring with an annular protrusion structure is provided in the middle of the end facing the support 8. Corresponding arc-shaped holes and a positioning ring groove are opened on the support 8. The positioning slip ring is fitted and clamped into the positioning ring groove and can rotate around its own axis in the positioning ring groove. The disc-shaped structure of the flywheel support end connecting member 13 and the support 8 are connected and fixed through threaded connectors at the arc-shaped holes. When installing the flywheel torque test structure 14, a wrench can be fitted and clamped outside the cylindrical protrusion, and the flywheel support end connecting member 13 can be rotated through the wrench to eliminate the assembly clearance between the flywheel torque test structure 14 and the flywheel support platform end connecting member and the flywheel support end connecting member 13, and to eliminate the relative displacement angle between the primary mass flywheel and the secondary mass flywheel in the flywheel of the flywheel torque test structure 14, thereby improving the calibration accuracy.

[0119] Since the self-weight of the flywheel torque test structure 14 is heavier than that of the drive shaft torque test structure 11, the positioning posts and the positioning slip rings can not only play a positioning role, but also play a supporting role, facilitating the installation and adjustment work; the setting of the arc-shaped holes enables the flywheel support end connector 13 to still be connected and fixed to the support 8 through various threaded connectors after rotating relative to the support 8 during the process of eliminating the assembly clearance.

[0120] Preferably, a mounting plate is fixedly installed on the top of the coupling plate 6. A positioning pin is provided on the top of the mounting plate. The bottom end of the upright post is fixedly connected with a bottom flat plate. The bottom flat plate is fixedly installed with the mounting plate, and the positioning hole formed therein is in fit connection with the positioning pin; the setting of the positioning pin and the positioning hole is used to ensure the symmetry of the calibration arm 2 with respect to the pedestal outer spherical surface bearing 7 when the calibration arm 2 is installed on the top of the coupling plate 6.

[0121] Preferably, it further includes a clip 4. The clip 4 has a plate-like structure and is located at the end of the coupling plate 6 away from the support 8. The bottom of the clip 4 is fixedly installed on the support table 5, and a limit hole is opened at the top. The limit hole is in fit connection with a limit platform provided at the end of the coupling plate 6 away from the support 8 and restricts the rotation of the coupling plate 6.

[0122] Preferably, the calibration arm 2 as a whole has a symmetrical triangular frame structure. Its upright post is the symmetry line of the triangular frame structure. Triangular cones are provided at both ends of the cross arm of the calibration arm 2, and a flat plate is provided at the top. A level is installed on the flat plate; two weight pans 1 are respectively hung on the two triangular cones.

[0123] An automobile flywheel torque calibration method uses the above-mentioned automobile powertrain torque test structure calibration device to calibrate the automobile flywheel torque. This calibration method includes the following steps:

[0124] B1. Collect the initial zero position V when the flywheel torque test structure 14 is not torsionally loaded through the data acquisition module of the flywheel torque sensor assembly 轮0 ;

[0125] B2. Insert the positioning post of the flywheel support end connector into the positioning post hole at the end of the coupling plate 6, and fixedly install the disc-shaped structure of the flywheel support end connector, the end of the coupling plate 6, and the primary mass flywheel of the flywheel torque test structure 14 through various threaded connectors;

[0126] B3. The positioning slip ring of the flywheel support end connector 13 is fitted and clamped into the positioning ring groove on the support 8. At each curved arc hole of the flywheel support end connector 13 and the support 8, each threaded connector is pre-installed, and the flywheel support end connector 13 and the support 8 are pre-connected. Subsequently, according to the internal spline position of the secondary mass flywheel, the flywheel support end connector 13 is rotated and adjusted relative to the flywheel torque test structure 14 to a suitable position, and the external spline provided at the columnar protrusion end of the flywheel support end connector 13 is fitted and connected with the internal spline of the secondary mass flywheel;

[0127] B4. The wrench is fitted and clamped to the outside of the flattened side wall of the columnar protrusion of the flywheel support end connector 13, and the flywheel support end connector 13 is rotated by the wrench to eliminate the assembly clearance between the flywheel torque test structure 14 and the flywheel support platform end connector and the flywheel support end connector 13, and the relative displacement deflection angle between the primary mass flywheel and the secondary mass flywheel of the flywheel torque test structure 14. Subsequently, each pre-installed threaded connector is tightened to install and fix the flywheel support end connector 13 to the support 8;

[0128] During this process, the calibration arm 2 also rotates with the coupling plate 6 and the flywheel support platform end connector, and the rotation angle is ɑ 轮1 ;

[0129] B5. A pair of weight pans 1 are hung on both ends of the cross arm of the calibration arm 2. According to the inclination of the cross arm, weights are added to one of the weight pans 1 accordingly to make the cross arm rotate to the horizontal position and maintain the set time t 轮 , and record the mass M of the added weights at this time 轮1 and the set time t 轮 and the voltage value group {V 轮1} output by the flywheel torque sensor assembly within;

[0130] B6. Loosen each threaded connector in each curved arc hole, fit and clamp the wrench to the outside of the flattened side wall of the columnar protrusion of the flywheel support end connector 13, and rotate the flywheel support end connector 13 again by the wrench. Subsequently, tighten each loosened threaded connector to install and fix the flywheel support end connector 13 to the support 8. During this process, the calibration arm 2 also rotates with the coupling plate 6 and the flywheel support platform end connector, and the rotation angle is ɑ 轮2 , and then obtain the mass M of the added weights and the voltage value group {V 轮2} in the same way as in B5; 轮2}

[0131] B7. Repeat the process of B6 to successively obtain M 轮3 and {V 轮3}, M 轮4 and {V 轮4}... M 轮n and {V 轮n};

[0132] B8. Obtain the torque T received by the flywheel torque test structure 14 during each operation among B5 to B7 according to Equation 4. 轮n ;

[0133] T 轮n = L × M 轮n × g (Equation 4)

[0134] where L is the lever arm length of the weight gravity acting on the centroid of the coupling plate 6, g is the acceleration due to gravity, and n = 1, 2, ……;

[0135] B9. Process {V 轮1}, {V 轮2}... {V 轮n} to obtain V 轮1 、V 轮2 ... V 轮n . The processing process of a single voltage value group is to subtract each voltage value in the voltage value group from V 轮0 and average them;

[0136] B10. Fit the calibration curve of the flywheel torque test structure 14 according to (V 轮1 , T 轮1 ), (V 轮2 , T 轮2 )... (V 轮n , T 轮n ) to obtain Equation 5 as follows:

[0137] T 轮 = k 轮 V 轮 + b 轮 (Equation 5)

[0138] where k 轮 and b 轮 are both constants obtained by fitting;

[0139] B11. Calculate the linearity error δ between the actual measurement results of each group and the calibration curve of the flywheel torque test structure 14 obtained by fitting according to Equation 6 轮1 、δ 轮2 ... δ 轮n ;

[0140] (Equation 6)

[0141] where n = 1, 2, ……;

[0142] Subsequently, compare the magnitudes of δ 轮 and δ 轮0 :

[0143] If δ 轮 < δ轮0 , then the flywheel torque test structure 14 meets the development requirements;

[0144] Otherwise, the flywheel torque test structure 14 does not meet the development requirements;

[0145] wherein, δ 轮 = max{δ 轮1 , δ 轮2 ... δ 轮n}, and δ 轮0 is the set allowable linearity error.

[0146] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0147] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements 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.

Claims

1. A calibration device for the torque test structure of an automotive powertrain, characterized in that: The support platform (5) and the support seat (8) are installed and fixed on the platform (3). A pair of pillow block spherical roller bearings (7) are installed and fixed on the top of the support platform (5). This pair of pillow block spherical roller bearings (7) are coaxially arranged, and their axes are horizontal and intersect with the support platform (5). The coupling plate (6) is of a cylindrical structure and is rotatably installed on a pair of the pillow block spherical roller bearings (7). The column of the calibration arm (2) is installed and fixed on the top of the coupling plate (6). The axis direction of the cross arm of the calibration arm (2) is horizontal and is spatially perpendicular to the axis of the pillow block spherical roller bearings (7). A pair of weight pans (1) are symmetrically hung at both ends of the cross arm. It further includes a flywheel torque testing structure (14) which is respectively installed and connected to the coupling plate (6) and the support seat (8) through a flywheel support platform end connector and a flywheel support seat end connector (13). The flywheel torque testing structure (14) includes a flywheel and a flywheel torque sensor assembly. The flywheel torque sensor assembly is integrated on the surface of the primary mass flywheel of the flywheel. The secondary mass flywheel of the flywheel is provided with internal splines. The flywheel support platform end connector is of a disc-shaped structure with a positioning post in the middle. This disc-shaped structure is installed and fixed to the end of the coupling plate (6) facing the support seat (8) and the primary mass flywheel. The positioning post is inserted into the positioning post hole opened at the end of the end of the coupling plate (6) facing the support seat (8) and can rotate around its own axis in the positioning post hole. The flywheel support seat end connector (13) is of a disc-shaped structure with a columnar protrusion in the middle. This disc-shaped structure is installed and fixed to the support seat (8). The columnar protrusion is connected with the internal splines of the secondary mass flywheel through the external splines provided at its end. The flywheel torque testing structure (14), the flywheel support platform end connector and the flywheel support seat end connector (13) are all coaxially arranged with the pillow block spherical roller bearings (7). The side wall of the columnar protrusion of the flywheel support seat end connector (13) is flattened into a planar structure. The disc-shaped structure of the flywheel support seat end connector (13) is provided with arc-shaped holes, and a positioning slip ring with an annular protrusion structure is provided in the middle of the end facing the support seat (8). The support seat (8) is correspondingly provided with arc-shaped holes and a positioning ring groove. The positioning slip ring is fitted and clamped into the positioning ring groove and can rotate around its own axis in the positioning ring groove. The disc-shaped structure of the flywheel support seat end connector (13) and the support seat (8) are connected and fixed through threaded connectors at each of the arc-shaped holes. An installation plate is installed and fixed on the top of the coupling plate (6). A positioning pin is provided on the top of the installation plate. The bottom end of the column is fixedly connected with a bottom flat plate. The bottom flat plate is installed and fixed to the installation plate, and the positioning hole opened on it is connected with the positioning pin in a matching manner. It further includes a clip (4). The clip (4) has a plate-like structure and is located at the end of the connecting shaft plate (6) away from the support (8). The bottom of the clip (4) is fixedly mounted on the support platform (5), and a limit hole is provided at the top. The limit hole is engaged and clamped with a limit platform provided at the end of the connecting shaft plate (6) away from the support (8), and the rotation of the connecting shaft plate (6) is restricted.

2. The calibration device for the torque test structure of an automotive powertrain according to claim 1, characterized in that: The calibration arm (2) has an overall symmetrical triangular frame structure, and its vertical column is the symmetry line of the triangular frame structure. Triangular pyramids are provided at both ends of the cross arm of the calibration arm (2), and a flat plate is provided at the top. A level is mounted on the flat plate; the two weight pans (1) are respectively hung on the two triangular pyramids.

3. A method for calibrating the torque of an automotive flywheel, using the calibration device for the torque test structure of an automotive powertrain as described in claim 1 or 2 to calibrate the torque of the automotive flywheel, characterized in that, It includes the following steps: B1, collecting the initial zero position V of the flywheel torque test structure (14) when not subjected to torsion through the data acquisition module of the flywheel torque sensor assembly 轮0 ; B2, insert the positioning column of the flywheel support platform end connector into the positioning column hole at the end of the connecting shaft plate (6), and fixedly mount the disc-shaped structure of the flywheel support platform end connector, the end of the connecting shaft plate (6), and the primary mass flywheel of the flywheel torque test structure (14) through each threaded connector. B3, the positioning slip ring of the flywheel support end connector (13) is fitted and clamped into the positioning ring groove on the support (8), and each threaded connector is pre-installed at the corresponding curved arc holes of the flywheel support end connector (13) and the support (8), and the flywheel support end connector (13) is pre-connected to the support (8). Subsequently, according to the position of the internal spline of the secondary mass flywheel, rotate and adjust the flywheel support end connector (13) relative to the flywheel torque test structure (14) to a suitable position, and connect the external spline provided at the end of the columnar protrusion of the flywheel support end connector (13) with the internal spline of the secondary mass flywheel. B4, fit and clamp a wrench to the flattened side wall outside the columnar protrusion of the flywheel support end connector (13), and rotate the flywheel support end connector (13) through the wrench to eliminate the assembly gap between the flywheel torque test structure (14), the flywheel support platform end connector, and the flywheel support end connector (13), and the relative displacement deflection angle between the primary mass flywheel and the secondary mass flywheel of the flywheel torque test structure (14); subsequently, tighten each pre-installed threaded connector to fixedly mount the flywheel support end connector (13) to the support (8). During this process, the calibration arm (2) also rotates following the coupling plate (6) and the flywheel support end connecting member, with the rotation angle being ɑ 轮1 ; B5, suspend a pair of weight pans (1) at both ends of the cross arm of the calibration arm (2). According to the inclination of the cross arm, add weights to one of the weight pans (1) accordingly, so that the cross arm rotates to the horizontal position and maintains the set time t 轮 , record the mass M of the added weights at this time 轮1 and the set time t 轮 within the voltage value group {V 轮1} output by the flywheel torque sensor assembly; B6. Loosen each of the threaded connectors in the respective arcuate holes, fit and clamp the wrench to the outside of the flattened side wall of the columnar protrusion of the flywheel support end connector (13), and then rotate the flywheel support end connector (13) again through the wrench. Subsequently, tighten each of the loosened threaded connectors to fix the flywheel support end connector (13) to the support (8). During this process, the calibration arm (2) also rotates with the coupling plate (6) and the flywheel support end connector, and the rotation angle is ɑ 轮2 , and then obtain the mass M of the additional weights in the corresponding manner of B5 轮2 and the voltage value set {V 轮2} output by the flywheel torque sensor assembly; B7, repeat the process of B6 to successively obtain M 轮3 and {V 轮3}, M 轮4 and {V 轮4}... M 轮n and {V 轮n}; B8. Obtain the torque T received by the flywheel torque test structure (14) during each operation among B5 to B7 according to Equation Four 轮n ; T 轮n = L × M 轮n × g (Equation 4) Wherein, L is the lever arm length of the force of the weight gravity acting on the center of gravity of the connecting shaft plate (6), g is the acceleration due to gravity, and n = 1, 2, ……; B9 processes {V 轮1}, {V 轮2}... {V 轮n} to obtain V 轮1 , V 轮2 ... V 轮n . The processing process of a single voltage value group is to subtract each voltage value in the voltage value group by V 轮0 and average them; B10, according to (V 轮1 , T 轮1 ), (V 轮2 , T 轮2 ),... (V 轮n , T 轮n ), the calibration curve of the flywheel torque test structure (14) is obtained by fitting as Equation Five: T 轮 = k 轮 V 轮 + b 轮 (Equation 5) where k 轮 and b 轮 are both constants obtained by fitting; B11. Calculate the linearity error δ between the actual measurement results of each group and the calibration curve of the flywheel torque test structure (14) obtained by fitting according to Equation VI 轮1 , δ 轮2 ... δ 轮n ; (Formula VI) Wherein, n = 1, 2, ……; Subsequently, compare δ 轮 with δ 轮0 in terms of magnitude: If δ 轮 < δ 轮0 , then the flywheel torque test structure (14) meets the development requirements; Otherwise, the flywheel torque test structure (14) does not meet the development requirements; Among them, δ 轮 = max{δ 轮1 , δ 轮2 …… δ 轮n}, where δ 轮0 is the set allowable linearity error.

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