CN111766015A - Vehicle gravity center height measuring device and method - Google Patents
Vehicle gravity center height measuring device and method Download PDFInfo
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- CN111766015A CN111766015A CN202010615195.6A CN202010615195A CN111766015A CN 111766015 A CN111766015 A CN 111766015A CN 202010615195 A CN202010615195 A CN 202010615195A CN 111766015 A CN111766015 A CN 111766015A
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Abstract
The invention provides a vehicle gravity center height measuring device and a method, wherein the vehicle gravity center height measuring device comprises: the device comprises a measuring platform, a rotating platform, a driving assembly, a wheel load measuring assembly, a first angle measuring assembly and a calculating module. The rotating platform is rotatably connected relative to the measuring platform. The driving assembly is connected with the rotating platform and used for driving the rotating platform to rotate. The wheel load measuring assembly is arranged on the measuring platform and used for measuring loads. The first angle measuring component is used for measuring a first included angle of the rotating platform relative to the measuring platform. The calculation module is connected with the wheel load measurement assembly and the first angle measurement assembly and used for calculating the gravity center height of the vehicle according to the load acquired by the wheel load measurement assembly and the first included angle acquired by the first angle measurement assembly. The device adopts the driving assembly to drive the rotating platform, can carry out testing only by parking the rear wheel of the vehicle on the rotating platform and parking and braking, and has simple structure and high calculation accuracy.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a device and a method for measuring the gravity center height of a vehicle.
Background
At present, the measurement of the gravity center height of the vehicle is basically carried out on an integral type overturning test platform, the hardware requirement is high, the investment is large, only a large automobile test field or a large test mechanism has the rack, and the requirement of measuring the gravity center height of the vehicle is limited.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
To this end, a first object of the present invention is to provide a vehicle center of gravity height measuring device.
A second object of the present invention is to provide a vehicle center of gravity height measuring method.
To achieve the first object of the present invention, an embodiment of the present invention provides a vehicle center of gravity height measuring apparatus including: the device comprises a measuring platform, a rotating platform, a driving assembly, a wheel load measuring assembly, a first angle measuring assembly and a calculating module. The rotating platform is rotatably connected relative to the measuring platform. The driving assembly is connected with the rotating platform and used for driving the rotating platform to rotate. The wheel load measuring assembly is arranged on the measuring platform and used for measuring loads. The first angle measuring component is used for measuring a first included angle of the rotating platform relative to the measuring platform. The calculation module is connected with the wheel load measurement assembly and the first angle measurement assembly and used for calculating the gravity center height of the vehicle according to the load acquired by the wheel load measurement assembly and the first included angle acquired by the first angle measurement assembly.
The device is simple in structure, the vehicle gravity center height measuring device considers the influence of the change of the tire grounding point on the rotating platform on a calculation result and improves the calculation accuracy of the gravity center height, and the device is obtained by ingeniously calculating the torque balance of the grounding point of the rear wheel of the tire by utilizing the characteristic that a vehicle parking braking system only acts on the rear wheel, is provided with the rotating platform and is driven by the driving component, the wheel load measuring component measures the wheel load of each vehicle tire, and the device is simple in structure and low in hardware requirement and only needs the rotating platform, The driving assembly and the wheel load measuring assembly can be tested, and the hardware requirement for measuring the gravity height is greatly reduced. During testing, only the rear axle of the vehicle is arranged on the rotating platform, and the front wheel is arranged at the wheel load measuring assembly, so that the gravity center height of the vehicle is not limited by the length of the rack, and the vehicle gravity center height measuring device is particularly suitable for measuring the gravity center height of a long-wheelbase engineering vehicle.
In addition, the technical solution provided by the above embodiment of the present invention may further have the following additional technical features:
in the above technical scheme, the second angle measurement component is connected with the calculation module and used for measuring a second included angle of the vehicle relative to the measurement platform.
Through first angle measurement subassembly and second angle measurement subassembly, measure the first contained angle of rotation platform for measuring platform and measure the second contained angle of vehicle for measuring platform respectively, two angle measurement components mutual noninterference.
In any of the above technical solutions, the moving assembly includes a first moving assembly and a second moving assembly; wherein, on the measuring platform was located to the removal subassembly, the wheel looks adaptation of first removal subassembly and vehicle one side, the wheel looks adaptation of second removal subassembly and vehicle opposite side.
The wheel load measuring device is characterized in that the moving assembly is arranged on the measuring platform, the wheel load measuring assembly is arranged in the moving assembly and can move, the upper plane of the wheel load measuring assembly and the ground are arranged on the same measuring platform, the position of the wheel load measuring assembly is properly adjusted according to the wheelbase of the vehicle, the wheel load measuring device is theoretically suitable for measuring the gravity center height of any long wheelbase two-axle vehicle, and the application range of the vehicle gravity center height measuring device is greatly enlarged.
In any one of the above technical solutions, the wheel load measuring assembly includes: a wheel load measuring unit; the number of the wheel load measuring units is the same as the number of the front wheels or the number of the rear wheels of the vehicle.
A wheel load measuring unit measures a wheel load of a front wheel or a rear wheel of a vehicle.
In any of the above technical solutions, the calculation module includes: a real-time vehicle center of gravity height calculation module; the real-time vehicle gravity center height calculation module acquires the real-time vehicle gravity center height according to the first included angle, the second included angle and the load acquired by the wheel load measurement assembly.
When the gravity center height of the real-time vehicle is obtained, the rotating platform rotates, and the gravity center height of the real-time vehicle is obtained according to the first included angle, the second included angle and the load obtained by the wheel load measuring assembly.
In any of the above technical solutions, the calculation module further includes: a final vehicle center of gravity height calculation module; when the rotating platform rotates to the measuring angle of the first total number relative to the measuring platform along the first direction, the real-time vehicle gravity center height calculating module acquires the real-time vehicle gravity center height of the first total number in real time, when the rotating platform rotates to the measuring angle of the second total number relative to the measuring platform along the second direction, the real-time vehicle gravity center height calculating module acquires the real-time vehicle gravity center height of the second total number in real time, the first direction is opposite to the second direction, the final vehicle gravity center height calculating module acquires the average value of the real-time vehicle gravity center height of the first total number and the real-time vehicle gravity center height of the second total number, and the average value is the final vehicle gravity center height.
Through upwards lifting the rotating platform, the rotating platform falls downwards again, adopts the data of two positive and negative dimensions, calculates final vehicle focus height, and suspension deflection is to the influence of high calculation result of focus around the lightening that can be fine, in addition, through obtaining the average value of a plurality of real-time vehicle focus heights as final vehicle focus height, can effectually reduce at every turn measuring error's influence for vehicle focus height is more accurate.
In any of the above technical solutions, the real-time vehicle center of gravity height is obtained by the following formula:
wherein h is the gravity center height of the vehicle, G is the self gravity of the vehicle, L is the wheel base of the vehicle, α is the second angle, r is the tire radius of the vehicle, β is the first angle, x is the distance from the gravity center of the vehicle to the front axle or the distance from the gravity center of the vehicle to the rear axle, when x is the distance from the gravity center of the vehicle to the front axle, F isyFor the total wheel load of the front wheels of the vehicle, when x is the distance from the center of gravity of the vehicle to the rear axle, FyThe total wheel load of the rear wheels of the vehicle.
By the formula, the gravity center height of the vehicle can be accurately obtained in real time, and the calculation method is simple and feasible.
To achieve the second object of the present invention, an embodiment of the present invention provides a vehicle center of gravity height measuring method, including: the method comprises the steps of obtaining the self gravity of the vehicle, the wheel base of the vehicle, the radius of a tire of the vehicle, the distance between the gravity center of the vehicle and a front axle or the distance between the gravity center of the vehicle and a rear axle. And controlling the rotating platform to rotate to a first total measuring angle relative to the measuring platform along a first direction, and acquiring a first included angle between the rotating platform and the measuring platform, a second included angle between the vehicle and the measuring platform and a load acquired by the wheel load measuring assembly in real time to obtain a first total real-time vehicle gravity center height. The height of the center of gravity of the vehicle is calculated based on the first total number of real-time vehicle center of gravity heights.
In the method for measuring the gravity center height of the vehicle, the driving assembly is used for driving, and the wheel load measuring assembly is used for measuring the wheel load of each vehicle tire. During testing, only the rear shaft of the vehicle is located on the rotating platform, the wheel load measuring assembly is located at the front wheel, so that the gravity center height of the vehicle is not limited by the length of the rack, the method is suitable for measuring the gravity center height of a long-wheelbase engineering vehicle, the front and rear inclination angles of the vehicle are changed by utilizing the split type rotating platform with variable angles, and the vehicle is directly calculated through a related derivation formula, wherein when the real-time gravity center height of the vehicle is obtained, the rotating platform rotates and is lifted upwards firstly, the real-time gravity center height of the vehicle with a first total number is obtained, the rotating platform rotates and falls downwards, the real-time gravity center height of the vehicle with a second total number is obtained, the final gravity center height of the vehicle is calculated by adopting data of positive and negative two dimensions, the influence of the deformation amount of the front and rear suspension on the calculation result of the gravity center height can be well relieved, the influence of measurement error at every turn can be effectively reduced, so that the gravity center height of the vehicle is more accurate.
In addition, the technical solution provided by the above embodiment of the present invention may further have the following additional technical features:
in the above technical solution, before the center of gravity height of the vehicle is calculated, the method further includes: and controlling the rotating platform to rotate to a specific angle of a second total number relative to the measuring platform along a second direction, acquiring a first included angle between the rotating platform and the measuring platform, a second included angle between the vehicle and the measuring platform and a load acquired by the wheel load measuring assembly in real time, and acquiring a real-time gravity center height of the vehicle of the second total number, wherein the first direction is opposite to the second direction.
The accuracy of the measuring result is improved by measuring from the positive direction and the negative direction.
In any one of the above technical solutions, calculating the height of the center of gravity of the vehicle includes: and calculating the average value of the first total real-time vehicle gravity center height and the second total real-time vehicle gravity center height, wherein the average value is the final vehicle gravity center height.
By obtaining the average value, the final vehicle center of gravity height is more accurate.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a vehicle center of gravity height measuring apparatus according to an embodiment of the present invention;
FIG. 2 is a side view of a vehicle center of gravity height measuring device according to an embodiment of the present invention;
FIG. 3 is a top view of a vehicle center of gravity height measurement device in accordance with one embodiment of the present invention;
FIG. 4 is a vehicle diagram of one embodiment of the present invention;
FIG. 5 is a block diagram of a computing module according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart diagram of a method for measuring the height of the center of gravity of a vehicle according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a process for obtaining a second total real-time center of gravity height according to an embodiment of the present invention;
FIG. 8 is a flow chart illustrating the calculation of the height of the center of gravity according to an embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 8 is:
100: vehicle center of gravity height measuring device, 110: measurement platform, 120: rotating platform, 130: drive assembly, 140: wheel load measuring assembly, 150: first angle measurement assembly, 152: first angle, 160: a calculation module, 162: real-time vehicle center of gravity height calculation module, 164: final vehicle center of gravity height calculation module, 170: second angle measurement assembly, 172: second angle, 180: moving assembly, 182: first moving assembly, 184: second moving assembly, 200: vehicle, 210: vehicle rear wheel, 220: vehicle front wheel, 230: vehicle frame, 240: and (6) foundation pit.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A vehicle center of gravity height measurement apparatus 100 and method according to some embodiments of the present invention will be described with reference to fig. 1 to 8.
At present, the measurement of the gravity center height of a vehicle is basically carried out on an integral type overturning test platform, the integral type overturning test platform is high in manufacturing cost, the test is carried out on the integral type overturning test platform, the hardware requirement is high, the investment is large, only a large-sized automobile test field or a certification authority has the platform, and the requirement of the measurement of the gravity center height of the vehicle is limited. In addition, when the gravity center height of the vehicle is measured, the vehicle is required to be completely stopped on the overturning platform, but the length of the rack is often limited, so that the test of the engineering vehicle long-wheelbase two-axle vehicle is limited;
in the related technology, the inclination angle of the front and back directions of the vehicle is changed, the gravity center height value of the vehicle is determined through the position of the intersecting line of the gravity center vertical planes at 2 angular positions, the lifting operation is carried out on the front wheels and the rear wheels, and the measuring and calculating method is complex.
In summary, the present embodiment aims to solve at least one of the following problems:
(1) the hardware requirement for measuring the height of the center of gravity is high, and the investment is large;
(2) the length of the test board is limited, and the test board is not suitable for testing the two-axle engineering vehicle with the long axle distance.
Example 1:
as shown in fig. 1 to 3, the present embodiment provides a vehicle center of gravity height measuring apparatus 100, which includes a measuring platform 110, a rotating platform 120, a driving assembly 130, a wheel load measuring assembly 140, a first angle measuring assembly 150, and a calculating module 160. The rotating platform 120 is rotatably coupled with respect to the measuring platform 110. The driving assembly 130 is connected to the rotating platform 120 for driving the rotating platform 120 to rotate. The wheel load measuring assembly 140 is disposed on the measuring platform 110 for measuring the load. The first angle measurement assembly 150 is used to measure a first included angle 152 of the rotation platform 120 relative to the measurement platform 110. The calculating module 160 is connected to the wheel load measuring assembly 140 and the first angle measuring assembly 150, and is configured to calculate a height of a center of gravity of the vehicle 200 according to the load obtained by the wheel load measuring assembly 140 and the first included angle 152 obtained by the first angle measuring assembly 150.
The measuring platform 110 may be horizontally disposed, and if there is an angle between the measuring platform 110 and the horizontal plane, the angle between the measuring platform 110 and the horizontal plane should be corrected when calculating the center of gravity of the vehicle 200.
The driving assembly 130 is adopted to drive the rotating platform 120, only the front wheel 220 or the rear wheel of the vehicle is required to be parked on the rotating platform 120 and braked, and after the driving assembly 130 drives the rotating platform 120 to rotate, the front wheel 220 or the rear wheel 210 of the vehicle is lifted, and the axle load of the front axle and the rear axle is changed when the axle load is relatively flat under the influence of the inclination angle and the height of the center of gravity of the vehicle.
Either the vehicle front wheel 220 or the vehicle rear wheel 210 may be disposed on the wheel load measuring assembly 140 during testing.
For example, the following description is provided for the vehicle 200 with the rear wheel 210 on the rotating platform 120:
the vehicle front wheel 220 is located on the wheel load measuring assembly 140 and the vehicle rear wheel 210 is raised.
Based on the change rule, after the rotating platform 120 rotates, the wheel load measuring component 140 measures the sum of the front axle load and the wheel load, and measures the first included angle 152 between the rotating platform 120 at different rotating positions and the measuring platform 110 by the first angle measuring component 150, and three groups of measurement parameters, namely the front axle load, the inclination angle of the vehicle frame 230 and the angle of the rotating platform 120, are automatically input into a calculation program in the overturning process, and the gravity center height values of different frame inclination angles are calculated by combining the vehicle basic parameters which need to be input in the early stage, wherein the vehicle basic parameters refer to vehicle data when the vehicle 200 is positioned on the measuring platform 110, and the vehicle data include: the wheel base of the vehicle, the radius of the tire, the self gravity of the vehicle and the distance between the gravity center of the vehicle and the front axle. Wherein, measuring platform 110 can adopt measuring platform 110, and rotation platform 120 can adopt rotation platform, and drive assembly 130 can adopt hydraulic ram, and rotation platform 120 is located foundation ditch 240, and drive assembly 130 one end is located the foundation ditch, through setting up foundation ditch 240, makes things convenient for drive assembly 130's inspection and maintenance, makes things convenient for the vehicle to stop into measuring device 100.
In the test, after the angle of the rotating platform 120 is changed, the gravity center height is deduced based on the change of the axle load of the front axle of the vehicle, the axle load of the rear axle is not required to be measured, so that the device is simple in structure, the influence of the change of the tire grounding point on the rotating platform 120 on a calculation result is considered by the vehicle gravity center height measuring device 100, the calculation accuracy of the gravity center height is improved, and the characteristic that a vehicle parking braking system only acts on the rear wheel is utilized, and the grounding point of the rear wheel of the tire is skillfully calculated by taking the moment balance.
The vehicle gravity center height measuring device 100 is provided with the rotating platform 120, the rotating platform is driven by the driving assembly 130, the wheel load measuring assembly 140 measures the wheel load of each vehicle tire, the device is simple in structure and low in hardware requirement, the test can be carried out only by rotating the platform 120, the driving assembly 130 and the wheel load measuring assembly 140, and the hardware requirement for gravity center height measurement is greatly reduced.
During testing, only the rear axle of the vehicle is arranged on the rotating platform 120, and the front wheel is arranged at the wheel load measuring assembly 140, so that the gravity center height of the vehicle is not limited by the length of the rack, and the vehicle gravity center height measuring device is particularly suitable for measuring the gravity center height of a long-wheelbase engineering vehicle.
The rotatable platform 120 may be used for parking the front wheels 220 of the vehicle, i.e. the front and rear wheels are measured in reverse, which is preferably provided on the rotatable platform 120 by the rear wheels 210 of the vehicle, mainly considering the actual situation of the vehicle 200.
Example 2:
as shown in fig. 2, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
in the above technical solution, the second angle measuring component 170 is connected to the calculating module 160, and is used for measuring a second included angle 172 of the vehicle 200 relative to the measuring platform 110.
The first angle measuring assembly 150 and the second angle measuring assembly 170 are used for measuring a first included angle 152 of the rotating platform 120 relative to the measuring platform 110 and a second included angle 172 of the vehicle 200 relative to the measuring platform 110 respectively, and the two angle measuring elements do not interfere with each other.
The second included angle 172 may be specifically an included angle of the vehicle frame 230 relative to the measurement platform 110.
Example 3:
as shown in fig. 2 and 3, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
in any of the above solutions, the moving assembly 180 includes a first moving assembly 182 and a second moving assembly 184; the moving assembly 180 is disposed on the measuring platform 110, the first moving assembly 182 is adapted to a wheel on one side of the vehicle 200, and the second moving assembly 184 is adapted to a wheel on the other side of the vehicle 200.
The moving assembly 180 is disposed on the measuring platform 110, and when the measuring platform 110 is a horizontal ground, the moving assembly 180 is disposed on the horizontal ground in front of the rotating platform 120, for example, the first moving assembly 182 and the second moving assembly 184 may be two sliding grooves, the wheel-mounted measuring assembly 140 is disposed in the sliding grooves and can move, the upper plane of the wheel-mounted measuring assembly 140 and the measuring platform 110 are on the same plane, and the position of the wheel-mounted measuring assembly 140 is properly adjusted according to the wheelbase of the vehicle, which is theoretically suitable for measuring the height of the center of gravity of any long wheelbase two-axis vehicle, and greatly improves the application range of the vehicle height measuring apparatus 100.
Example 4:
as shown in fig. 1 and 2, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
in any of the above technical solutions, the wheel load measuring assembly 140 includes: a wheel load measuring unit 142; the number of the wheel load measuring units 142 is the same as the number of the front wheels of the vehicle 200 or the number of the rear wheels of the vehicle 200.
One wheel load measuring unit 142 measures the wheel load of one vehicle front wheel 220 or one vehicle rear wheel 210, and when the vehicle front wheel 220 is located in the wheel load measuring unit 142, the embodiment only needs to measure the wheel load of the vehicle front wheel 220, and does not need to measure the rear wheel, thereby reducing the complexity of the device and the difficulty of the calculation method.
Example 5:
as shown in fig. 5, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
in any of the above technical solutions, the calculating module 160 includes: a real-time vehicle center of gravity height calculation module 162; the real-time vehicle center of gravity height calculation module 162 obtains the real-time vehicle center of gravity height according to the first included angle 152, the second included angle 172 and the load obtained by the wheel load measurement component 140.
When the real-time vehicle center of gravity height is obtained, the rotating platform 120 rotates to obtain the real-time vehicle center of gravity height according to the first included angle 152, the second included angle 172 and the load obtained by the wheel load measuring assembly 140.
Example 6:
as shown in fig. 5, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
in any of the above technical solutions, the calculating module 160 further includes: a final vehicle center of gravity height calculation module 164; when the rotating platform 120 rotates to a first total measurement angle relative to the measuring platform 110 along a first direction, the real-time vehicle gravity center height calculating module 162 obtains a first total real-time vehicle gravity center height in real time, when the rotating platform 120 rotates to a second total measurement angle relative to the measuring platform 110 along a second direction, the real-time vehicle gravity center height calculating module 162 obtains a second total real-time vehicle gravity center height in real time, the first direction is opposite to the second direction, and the final vehicle gravity center height calculating module 164 obtains an average value of the first total real-time vehicle gravity center height and the second total real-time vehicle gravity center height, wherein the average value is a final vehicle gravity center height.
When the real-time vehicle gravity center height is obtained, the rotating platform 120 rotates, is lifted upwards first to obtain the first total real-time vehicle gravity center height, the rotating platform 120 rotates again, falls downwards to obtain the second total real-time vehicle gravity center height, and the rotating platform 120 rotates upwards and downwards, so that the influence of front and rear suspension deformation on the gravity center height calculation result can be reduced.
Through upwards lifting up rotating platform 120, rotating platform 120 falls downwards again, adopts the data of two positive and negative dimensions, calculates final vehicle focus height, and the influence of suspension deflection to the high calculation result of focus before and after can be fine lightening, in addition, through obtaining the average value of a plurality of real-time vehicle focus heights as final vehicle focus height, can effectually reduce at every turn measuring error's influence for vehicle focus height is more accurate.
Example 7:
as shown in fig. 1, 2 and 4, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
in any of the above technical solutions, the real-time vehicle center of gravity height is obtained by the following formula:
wherein h is the height of the center of gravity of the vehicle 200, G is the self-gravity of the vehicle 200, L is the wheel base of the vehicle 200, α is the second angle 172, r is the tire radius of the vehicle 200, β is the first angle 152, x is the distance from the center of gravity of the vehicle 200 to the front axle or the distance from the center of gravity of the vehicle 200 to the rear axle, and when x is the distance from the center of gravity of the vehicle 200 to the front axle, F isyFor the total wheel load of the front wheels of the vehicle 200, when x is the distance of the center of gravity of the vehicle 200 from the rear axle, FyThe total wheel load for the rear wheels of the vehicle 200.
By the formula, the gravity center height of the vehicle can be accurately obtained in real time, and the calculation method is simple and feasible.
Example 8:
as shown in fig. 6, the present embodiment provides a vehicle center of gravity height measuring method, including the steps of:
step S102, acquiring the self gravity of the vehicle, the wheel base of the vehicle, the radius of a tire of the vehicle, the distance between the gravity center of the vehicle and a front axle or the distance between the gravity center of the vehicle and a rear axle;
step S104, controlling the rotating platform to rotate relative to the measuring platform along the first direction to a first total measuring angle, and acquiring a first included angle between the rotating platform and the measuring platform, a second included angle between the vehicle and the measuring platform and a load acquired by the wheel load measuring assembly in real time to acquire a first total real-time vehicle gravity center height;
and step S106, calculating the gravity center height of the vehicle according to the first total real-time vehicle gravity center height.
The vehicle data includes: the vehicle wheel base L, the tire radius r, the vehicle gravity G and the distance x between the vehicle gravity center and the front axle. The wheel load of the front wheels 220 of the vehicle or the wheel load of the rear wheels 210 of the vehicle can be obtained by the wheel load measurement group 140, respectively.
In the test, either the vehicle front wheel 220 or the vehicle rear wheel may be tested.
For example, the following description is provided for the vehicle 200 with the rear wheel 210 on the rotating platform 120: :
after the angle of the rotating platform 120 is changed, the gravity center height is deduced according to the change of the axle load of the front axle of the vehicle, the axle load of the rear axle is not required to be measured, so that the height obtaining process is simple and rapid, the influence of the change of the tire grounding point on the rotating platform 120 on a calculation result is considered in the vehicle gravity center height measuring method, the calculation accuracy of the gravity center height is improved, and the characteristic that a vehicle parking braking system only acts on the rear wheel is utilized, and the torque balance of the grounding point of the rear wheel of the tire is skillfully calculated.
In the method for measuring the gravity center height of the vehicle, the driving assembly 130 is used for driving, and the wheel load measuring assembly 140 is used for measuring the wheel load of each vehicle tire, so that the method is simple, the requirement on hardware is low, the test can be carried out only by rotating the platform 120, the driving assembly 130 and the wheel load measuring assembly 140, and the hardware requirement on the gravity center height measurement is greatly reduced.
During testing, only the rear axle of the vehicle is arranged on the rotating platform 120, and the wheel load measuring assembly 140 is arranged at the front wheel 220 of the vehicle, so that the gravity center height of the vehicle is not limited by the length of the rack, and the vehicle is particularly suitable for measuring the gravity center height of a long-wheelbase engineering vehicle.
The vehicle gravity center height measuring method utilizes a split type rotating platform with a variable angle to change the front and back dip angles of a vehicle, and the front and back dip angles are directly calculated through a related derivation formula, wherein when the real-time vehicle gravity center height is obtained, the rotating platform 120 rotates and is lifted upwards firstly to obtain the first total real-time vehicle gravity center height, the rotating platform 120 rotates and falls downwards to obtain the second total real-time vehicle gravity center height, the data of positive and negative two dimensions are adopted to calculate the final vehicle gravity center height, the influence of front and back suspension deformation on the calculation result of the gravity center height can be well lightened, in addition, the average value of a plurality of real-time vehicle gravity center heights is obtained to be used as the final vehicle gravity center height, the influence of each measurement error can be effectively reduced, and the vehicle gravity.
Example 9:
as shown in fig. 7, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
in the above technical solution, the method for measuring the height of the center of gravity of a vehicle further includes the steps of:
step S202, the rotating platform is controlled to rotate to a specific angle of a second total number relative to the measuring platform along a second direction, a first included angle between the rotating platform and the measuring platform, a second included angle between the vehicle and the measuring platform and a load obtained by the wheel load measuring assembly are obtained in real time, and the gravity center height of the vehicle in the second total number is obtained, wherein the first direction is opposite to the second direction.
The accuracy of the measuring result is improved by measuring from the positive direction and the negative direction.
Example 10:
as shown in fig. 8, in addition to the technical features of the above embodiment, the present embodiment further includes the following technical features:
calculating the height of the center of gravity of the vehicle includes:
and step S302, calculating the average value of the first total real-time vehicle gravity center height and the second total real-time vehicle gravity center height, wherein the average value is the final vehicle gravity center height.
By obtaining the average value, the final vehicle center of gravity height is more accurate.
The specific embodiment is as follows:
the present embodiment provides a method for measuring the height of the center of gravity of a vehicle, wherein the wheel load measuring unit 142 employs a wheel load meter, the rotating platform 120 employs a rotating platform, the first angle measuring assembly 150 employs an angle sensor, and the second angle measuring assembly 170 also employs an angle sensor.
Firstly, the vehicle 200 is parked on the measuring platform 110, the vehicle wheel base L and the tire radius r are measured, the vehicle gravity G is obtained according to the four-wheel load result measured by the wheel load meter, the distance x between the gravity center and the front axle is calculated, and as shown in fig. 4, the 4 parameters are input into the calculation program in advance as the vehicle intrinsic parameters.
Then, the rear axle of the vehicle 200 is parked on the rotating platform, the front axle is parked on the flat ground, when the vehicle is parked stably, the driver pulls the hand brake and gets off the vehicle, and after the rotating platform checks the level, the angle sensor on the rotating platform is zeroed. An angle sensor on the vehicle frame 230 is used to measure the real-time inclination of the vehicle frame 230 while zeroing.
Operating the rotating platform to rotate upwards by a certain angle, outputting the rotating platform angle β and the vehicle frame 230 angle α to a calculation program in real time by the rotating platform angle sensor and the vehicle frame 230 angle sensor, and measuring the wheel load F of the left and right wheels of the front axle by the wheel load instrument1And F2The measurement results are simultaneously output to a calculation program, and the calculation program automatically calculates the gravity height values h corresponding to the different rotation angles β according to the following derivation process.
Total stress of the front wheels:
Fy＝F1+F2
wherein, F1And F2The wheel loads of the left wheel and the right wheel of the front shaft are respectively.
Front wheel force FyThe vertical distance to the rear wheel ground point is:
L×cosα+r×sinβ
where L is the wheel base of the vehicle, r is the radius of the tire of the vehicle, α is the angle between the frame 230 of the vehicle and the measuring platform 110 (the second angle 172), and β is the angle between the rotating platform and the measuring platform 110 (the first angle 152).
The vertical distance from the gravity G of the vehicle to the grounding point of the rear wheel is as follows:
(h-r)×sinα+(L-x)×cosα+r×sinβ
wherein h is the height of the gravity center of the vehicle, and x is the distance between the gravity center of the vehicle and the front axle.
Taking the moment of contact of the rear wheel of the vehicle so that the force analysis of the rear wheel can be omitted, as shown in fig. 2, the following equation is obtained:
Fy×(L×cosα+r×sinβ)＝G×[(h-r)×sinα+(L-x)×cosα+r×sinβ]
through simplification, the calculation result of the gravity center height under different alpha angles during reverse parking can be obtained as follows:
by varying the angle β at which the rotating platform is raised upward,obtaining the corresponding gravity center height values h under three groups of different rotation angles β1，h2，h3。
In order to reduce the influence of the deformation of the front and rear suspensions on the calculation result of the gravity center height, the rotating platform is rotated downwards, and the gravity center height values h corresponding to three angles are calculated4，h5，h6Note that α and β both become negative values after the rotating platform rotates downward, and the final height of the center of gravity is obtained after taking the average:
after the rotation operation of the six groups of rotation angles beta is completed, the calculation program can automatically output the final vehicle gravity center height value h according to the derivation process.
The above computational derivation is based on two preconditions: firstly, the grounding point of the rotating platform is changed in the rotating process, and the connecting line of the grounding point of the tire on the slope and the wheel center is considered to be always vertical to the supporting surface of the rotating platform; secondly, when the parking brake is used to park the vehicle on the rotating platform, the brake force only acts on the rear wheel, and the front wheel can still rotate freely, so that the front wheel only bears the acting force in the direction vertical to the ground on the flat ground.
For example, the front wheel of the vehicle can be parked on the rotating platform, and the wheel load of the rear wheel on the flat ground is measured by the wheel load meter, so that the stress of the front wheel is reversely pushed, and the gravity center height h of the vehicle is obtained.
In summary, the embodiment of the invention has the following beneficial effects:
1. the vehicle gravity center height measuring device 100 is simple in structure, greatly reduces the requirement on hardware, can complete measurement only by one rotating platform and the wheel load measuring assembly, is simple in operation mode, and reduces labor cost.
2. The vehicle gravity center height measuring device 100 is not limited by the length of the rack, is particularly suitable for measuring the gravity center height of a long-wheelbase engineering vehicle, and is theoretically suitable for measuring the gravity center height of any long-wheelbase two-axle vehicle only by arranging the moving assembly 180 on the measuring platform 110.
3. According to the method for measuring the gravity center height of the vehicle, the gravity center height is deduced based on the change of the axle load of the front axle of the vehicle after the angle of the rotating platform is changed, the axle load of the rear axle is not required to be measured, the method is simplified, and the calculation speed and the application efficiency are improved. The method for measuring the gravity center height of the vehicle considers the influence of the change of the tire grounding point on the rotating platform on the calculation result, and improves the calculation accuracy of the gravity center height. The method for measuring the gravity center height of the vehicle skillfully calculates the torque balance of the grounding point of the rear wheel of the tire by utilizing the characteristic that the parking braking system of the vehicle only acts on the rear wheel, thereby simplifying the steps.
In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A vehicle center of gravity height measuring device (100), comprising:
a measurement platform (110);
a rotating platform (120) rotatably connected with respect to the measuring platform (110);
the driving assembly (130) is connected with the rotating platform (120) and is used for driving the rotating platform (120) to rotate;
the wheel load measuring assembly (140) is arranged on the measuring platform (110) and is used for measuring load;
a first angle measuring assembly (150) for measuring a first included angle (152) of the rotating platform (120) relative to the measuring platform (110);
and the calculation module (160) is connected with the wheel load measurement assembly (140) and the first angle measurement assembly (150) and is used for calculating the gravity center height of the vehicle (200) according to the load acquired by the wheel load measurement assembly (140) and the first included angle (152) acquired by the first angle measurement assembly (150).
2. The vehicle center of gravity height measurement device (100) according to claim 1, further comprising:
a second angle measurement assembly (170) connected to the calculation module (160) for measuring a second angle (172) of the vehicle (200) relative to the measurement platform (110).
3. The vehicle center of gravity height measurement device (100) according to claim 2, further comprising:
a moving assembly (180) comprising a first moving assembly (182) and a second moving assembly (184);
the moving assembly (180) is arranged on the measuring platform (110), the first moving assembly (182) is matched with a wheel on one side of the vehicle (200), and the second moving assembly (184) is matched with a wheel on the other side of the vehicle (200).
4. The vehicle center of gravity height measurement device (100) according to claim 2, wherein the wheel load measurement assembly (140) includes:
a wheel load measuring unit (142);
wherein the number of the wheel load measuring units (142) is the same as the number of front wheels of the vehicle (200) or the number of rear wheels of the vehicle (200).
5. The vehicle center of gravity height measurement device (100) according to any one of claims 2 to 4, wherein the calculation module 160 comprises:
a real-time vehicle center of gravity height calculation module (162);
the real-time vehicle gravity center height calculation module (162) obtains the real-time vehicle gravity center height according to the first included angle (152), the second included angle (172) and the load obtained by the wheel load measurement assembly (140).
6. The vehicle center of gravity height measurement device (100) according to claim 5, wherein said calculation module 160 further comprises:
a final vehicle center of gravity height calculation module (164);
when the rotating platform (120) rotates relative to the measuring platform (110) along a first direction to a first total number of measuring angles, the real-time vehicle gravity center height calculating module (162) acquires a first total number of real-time vehicle gravity center heights in real time, when the rotating platform (120) rotates relative to the measuring platform (110) along a second direction to a second total number of measuring angles, the real-time vehicle gravity center height calculating module (162) acquires a second total number of real-time vehicle gravity center heights in real time, the first direction is opposite to the second direction, and the final vehicle gravity center height calculating module (164) acquires an average value of the first total number of real-time vehicle gravity center heights and the second total number of real-time vehicle gravity center heights, wherein the average value is a final vehicle gravity center height.
7. The vehicle center of gravity height measurement device (100) according to claim 5, wherein the real-time vehicle center of gravity height is obtained by the following formula:
wherein h is the centre of gravity height of vehicle (200), G is the self gravity of vehicle (200), L is the wheel base of vehicle (200), α is second contained angle (172), r is the tire radius of vehicle (200), β is first contained angle (152), x is the centre of gravity of vehicle (200) apart from the front axle distance or the centre of gravity of vehicle (200) apart from the distance of rear axle, when x is the centre of gravity of vehicle (200) apart from the front axle distance, FyFor the total wheel load of the front wheels of the vehicle (200), when x is the distance of the center of gravity of the vehicle (200) from the rear axle, FyThe total wheel load is the rear wheel of the vehicle (200).
8. A vehicle center of gravity height measurement method employing the vehicle center of gravity height measurement device (100) according to any one of claims 1 to 7, characterized by comprising:
acquiring the self gravity of a vehicle, the wheel base of the vehicle, the radius of a tire of the vehicle, the distance between the gravity center of the vehicle and a front axle or the distance between the gravity center of the vehicle and a rear axle;
controlling the rotating platform to rotate to a first total measuring angle relative to the measuring platform along a first direction, and acquiring the first included angle between the rotating platform and the measuring platform, the second included angle between the vehicle and the measuring platform and the load acquired by the wheel load measuring assembly in real time to acquire a first total real-time vehicle gravity center height;
the height of the center of gravity of the vehicle is calculated based on the first total number of real-time vehicle center of gravity heights.
9. The vehicle center of gravity height measurement method according to claim 8, wherein before performing the calculation of the vehicle center of gravity height, further comprising:
control rotary platform along the second direction for measuring platform rotates to the specific angle of second total, acquires in real time rotary platform with measuring platform first contained angle the vehicle with measuring platform the second contained angle and the load that wheel load measuring component acquireed obtains the real-time vehicle focus height of second total, first direction with the second direction is opposite.
10. The vehicle center of gravity height measurement method according to claim 9, wherein said calculating the vehicle center of gravity height comprises:
calculating an average of the first total real-time vehicle center of gravity height and the second total real-time vehicle center of gravity height, the average being a final vehicle center of gravity height.
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