Method for calculating the mass center of mass of heavy truck cab, heavy truck and medium

Abstract

The present invention discloses a method for measuring the center of mass of a heavy-duty truck cab on a real vehicle, a heavy-duty truck, and a medium. These methods belong to the technical field of heavy-duty trucks. The heavy-duty truck cab is mounted on a suspension system comprising a suspension coil spring shock absorber, a tilting hydraulic cylinder assembly, a suspension stabilizer bar, and a suspension swing arm assembly. The method comprises: obtaining the sprung mass of the suspension coil spring shock absorbers on the left, right, front, and rear sides of the heavy-duty truck cab to determine the total mass of the heavy-duty truck cab; determining the fore-aft and left-right coordinates of the center of mass of the heavy-duty truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers; obtaining the tilt angle of the heavy-duty truck cab through the center of mass when the torque of the tilting hydraulic cylinder assembly is zero; and determining the height coordinate of the center of mass of the heavy-duty truck cab based on the fore-aft coordinates and the tilting angle. This method achieves low-cost, short-cycle, and high-efficiency calculation of the center of mass of the heavy-duty truck cab.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy-duty trucks, and in particular to a method for measuring the mass center of a heavy-duty truck cab, a heavy-duty truck and a medium. Background Art

[0002] The cab mass and center of mass of heavy-duty trucks are input parameters for design, and engineers need to use them in the subsequent R&D process. Currently, the cabs of heavy-duty trucks of the same model have significantly different mass and center of mass due to differences in configuration. At present, the measurement of the mass and center of mass of heavy-duty truck cabs requires that the individual cab assembly be transported to a professional site for measurement. The main methods include suspension method, rotation method, or measurement using a center of gravity height and moment of inertia test bench. Special tooling fixtures need to be made during the operation. Current methods for measuring the mass and center of mass of heavy-duty truck cabs cannot be carried out in real time under actual vehicle conditions, and there are also problems such as long measurement cycles, complex processes, and high costs. Summary of the Invention

[0003] The main purpose of the present invention is to provide a method for measuring the mass center of mass of a heavy truck cab on a real vehicle, aiming to solve the technical problems of high cost, long cycle and low efficiency in measuring the mass center of mass of a heavy truck cab in the prior art.

[0004] To achieve the above objectives, the present invention provides a method for measuring the mass center of mass of a heavy truck cab on a real vehicle. The heavy truck cab is mounted on a suspension system, and the suspension system includes a suspension coil spring shock absorber, a tilting hydraulic cylinder assembly, a suspension stabilizer bar, and a suspension swing arm assembly. The method for measuring the mass center of mass of a heavy truck cab on a real vehicle includes:

[0005] Obtaining the sprung masses of coil spring shock absorbers at the left front, left rear, right front, and right rear suspensions of the heavy truck cab, and determining the total mass of the heavy truck cab based on the sprung masses;

[0006] Determine the fore-aft coordinates and left-right coordinates of the center of mass of the heavy-duty truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers, and use the fore-aft direction and left-right direction of the heavy-duty truck cab in the driving state as the fore-aft direction and left-right direction of the heavy-duty truck cab during actual vehicle measurement.

[0007] flipping the heavy truck cab based on the flip hydraulic cylinder assembly of the heavy truck cab, and obtaining a flip angle of the heavy truck cab passing through the center of gravity when the torque of the flip hydraulic cylinder assembly is zero;

[0008] The height coordinate of the center of mass of the heavy truck cab is determined according to the front-back coordinate and the flip angle.

[0009] Optionally, the step of obtaining the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front, and right rear of the heavy truck cab includes:

[0010] Obtaining the actual height of the suspension coil spring shock absorber;

[0011] determining the actual bearing capacity of the suspension coil spring shock absorber according to the height difference between the designed installation height and the actual height of the heavy truck cab, the calibrated stiffness of the suspension coil spring shock absorber, and the calibrated bearing capacity at the designed installation height;

[0012] The sprung mass of the suspension coil spring damper is determined based on the actual load capacity.

[0013] Optionally, the step of suspending the sprung mass of the coil spring shock absorber according to the actual load-bearing capacity comprises:

[0014] Obtaining an inclination angle of the suspension coil spring shock absorber;

[0015] The sprung mass is determined based on the actual load-bearing force and the inclination angle.

[0016] Optionally, the step of determining the fore-aft coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers comprises:

[0017] The sum of the sprung masses of the left front and right front suspension coil spring dampers is defined as the first mass, the sum of the sprung masses of the left rear and right rear suspension coil spring dampers is defined as the second mass, and the straight-line distance between the first straight line on which the left front and right front suspension coil spring dampers lie and the second straight line on which the left rear and right rear suspension coil spring dampers lie is defined as the fore-aft spacing;

[0018] The fore-aft coordinates of the center of mass of the heavy truck cab are determined according to the first mass, the second mass and the fore-aft distance.

[0019] Optionally, before the step of determining the left-right coordinates of the center of mass of the heavy truck cab according to the sprung mass and the spacing between the suspension coil spring shock absorbers, the method further includes:

[0020] determining a first left-right coordinate of the center of mass of the heavy truck cab according to the sprung masses of the left front and right front suspension coil spring shock absorbers and the distance between the left front and right front suspension coil spring shock absorbers;

[0021] The second left-right coordinate of the center of mass of the heavy truck cab is determined according to the sprung masses of the left rear and right rear suspension coil spring shock absorbers and the distance between the left rear and right rear suspension coil spring shock absorbers.

[0022] Optionally, the step of determining the left-right coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers comprises:

[0023] A third straight line is determined according to the first left-right coordinate and the second left-right coordinate, and the left-right coordinate is determined according to the third straight line and the front-back coordinate.

[0024] Optionally, before the step of obtaining the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front and right rear of the heavy truck cab, the method further includes:

[0025] Disassembling the suspension stabilizer bar and suspension swing arm assembly of the heavy truck cab;

[0026] Before the step of flipping the heavy truck cab based on the flip hydraulic cylinder assembly of the heavy truck cab, the method further includes:

[0027] Assemble the suspension stabilizer bar and suspension swing arm assembly of the heavy truck cab.

[0028] Optionally, the step of obtaining the rollover angle of the heavy truck cab passing the center of gravity includes:

[0029] During the process of using the tilting hydraulic cylinder assembly to tilt the heavy truck cab, a critical angle when the gravity torque of the tilting hydraulic cylinder assembly is zero is measured, and the critical angle is used as the tilting angle passing the center of gravity.

[0030] In addition, to achieve the above-mentioned purpose, the present invention also provides a heavy-duty truck, which includes: a heavy-duty truck cab, a suspension coil spring shock absorber, a flip hydraulic cylinder assembly, a memory, a processor, and a computer program stored in the memory and runnable on the processor. The computer program is configured to implement the steps of the above-mentioned method for measuring the center of mass of the heavy-duty truck cab. The heavy-duty truck cab is installed on the suspension coil spring shock absorber and is flipped by the flip hydraulic cylinder assembly.

[0031] In addition, to achieve the above-mentioned purpose, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned method for measuring the center of mass of the heavy-duty truck cab are implemented.

[0032] The embodiment of the present invention proposes a method for measuring the mass center of mass of a heavy truck cab, a heavy truck and a medium. The heavy truck cab is installed on a suspension system, and the suspension system includes a suspension coil spring shock absorber, a tilting hydraulic cylinder assembly, a suspension stabilizer bar and a suspension swing arm assembly. The method is as follows: obtaining the sprung load mass of the suspension coil spring shock absorbers at the left front, left rear, right front and right rear of the heavy truck cab, and determining the total mass of the heavy truck cab based on the sprung load mass; determining the total mass of the heavy truck cab based on the sprung load mass and the suspension coil spring shock absorber assembly ... The distance between the heavy truck cab and the vehicle body is determined, and the fore-aft coordinates and left-right coordinates of the center of mass of the heavy truck cab are determined, and the fore-aft direction and left-right direction of the heavy truck cab when in driving state are used as the fore-aft direction and left-right direction of the heavy truck cab when actual vehicle measurement is performed; the heavy truck cab is flipped based on the flip hydraulic cylinder assembly of the heavy truck cab, and when the torque of the flip hydraulic cylinder assembly is zero, the flip angle of the heavy truck cab passing the center of gravity is obtained; the height coordinate of the center of mass of the heavy truck cab is determined according to the fore-aft coordinates and the flip angle.

[0033] Without the use of specialized testing equipment or dedicated fixtures, and without the need for separate cab assembly assembly, the mass and center of mass coordinates of the current heavy-duty truck cab can be quickly and accurately calculated. The measuring tools used include four coil spring dampers, an inclinometer, and a vernier caliper. The height change of each coil spring damper is measured to calculate the mass on the coil springs, and thus the cab mass. The fore-aft coordinate (X) of the center of mass is calculated by the distribution ratio of the mass on the front and rear suspensions. The left-right coordinate (Y) of the center of mass is calculated by the distribution ratio of the mass on the left and right suspensions. The inclinometer is used to measure the angle of the cab when it flips over the center of gravity, and the height coordinate (Z) of the center of mass is calculated.

[0034] Without specialized testing equipment or fixtures, nor the need for a separate cab assembly, simple equipment such as coil spring shock absorbers, an inclinometer, and a vernier caliper allows for quick and accurate calculation of the mass and center of mass coordinates of the currently configured cab in the complete vehicle state, facilitating subsequent use by engineering designers. This system is suitable for calculating the mass and center of mass coordinates of heavy-duty truck cabs equipped with four-point suspension and hydraulic tilting systems. This enables real-time measurement of cab mass and center of mass in the complete vehicle state, reducing the cost and cycle time of cab mass and center of mass measurements. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiment of the present invention;

[0036] Figure 2 This is a flow chart of an embodiment of a method for calculating the center of mass of a heavy truck cab in a real vehicle according to the present invention;

[0037] Figure 3 A schematic diagram of the front-to-back coordinates and the left-to-right coordinates of an embodiment of a method for calculating the center of mass of a heavy truck cab in the present invention;

[0038] Figure 4 A schematic diagram of the cab and suspension rollover system structure of an embodiment of a method for calculating the center of mass of a heavy truck cab according to the present invention;

[0039] Figure 5 This is a schematic diagram of a cab flipping according to an embodiment of a method for calculating the mass center of mass of a heavy truck cab of the present invention.

[0040] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] Reference Figure 1 , Figure 1 This is a schematic diagram of the terminal structure of the hardware operating environment involved in the embodiment of the present invention.

[0043] like Figure 1 As shown, the terminal device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may optionally include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (WIreless-FIdelity, WI-FI) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM) memory, or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0044] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the terminal device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0045] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a data storage module, a network communication module, a user interface module and a computer program.

[0046] exist Figure 1 In the terminal device shown, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the terminal device of the present invention can be set in the terminal device, and the terminal device calls the computer program stored in the memory 1005 through the processor 1001 and performs the following operations:

[0047] Obtaining the sprung masses of coil spring shock absorbers at the left front, left rear, right front, and right rear suspensions of the heavy truck cab, and determining the total mass of the heavy truck cab based on the sprung masses;

[0048] Determine the fore-aft coordinates and left-right coordinates of the center of mass of the heavy-duty truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers, and use the fore-aft direction and left-right direction of the heavy-duty truck cab in the driving state as the fore-aft direction and left-right direction of the heavy-duty truck cab during actual vehicle measurement.

[0049] flipping the heavy truck cab based on the flip hydraulic cylinder assembly of the heavy truck cab, and obtaining a flip angle of the heavy truck cab passing through the center of gravity when the torque of the flip hydraulic cylinder assembly is zero;

[0050] The height coordinate of the center of mass of the heavy truck cab is determined according to the front-back coordinate and the flip angle.

[0051] Furthermore, the processor 1001 may call a computer program stored in the memory 1005 and perform the following operations:

[0052] The step of obtaining the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front, and right rear of the heavy truck cab comprises:

[0053] Obtaining the actual height of the suspension coil spring shock absorber;

[0054] determining the actual bearing capacity of the suspension coil spring shock absorber according to the height difference between the designed installation height and the actual height of the heavy truck cab, the calibrated stiffness of the suspension coil spring shock absorber, and the calibrated bearing capacity at the designed installation height;

[0055] The sprung mass of the suspension coil spring damper is determined based on the actual load capacity.

[0056] Furthermore, the processor 1001 may call a computer program stored in the memory 1005 and perform the following operations:

[0057] The step of suspending the sprung mass of the coil spring shock absorber according to the actual load capacity comprises:

[0058] Obtaining an inclination angle of the suspension coil spring shock absorber;

[0059] The sprung mass is determined based on the actual load-bearing force and the inclination angle.

[0060] Furthermore, the processor 1001 may call a computer program stored in the memory 1005 and perform the following operations:

[0061] The step of determining the fore-aft coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers comprises:

[0062] The sum of the sprung masses of the left front and right front suspension coil spring dampers is defined as the first mass, the sum of the sprung masses of the left rear and right rear suspension coil spring dampers is defined as the second mass, and the straight-line distance between the first straight line on which the left front and right front suspension coil spring dampers lie and the second straight line on which the left rear and right rear suspension coil spring dampers lie is defined as the fore-aft spacing;

[0063] The fore-aft coordinates of the center of mass of the heavy truck cab are determined according to the first mass, the second mass and the fore-aft distance.

[0064] Furthermore, the processor 1001 may call a computer program stored in the memory 1005 and perform the following operations:

[0065] Before the step of determining the left-right coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers, the method further includes:

[0066] determining a first left-right coordinate of the center of mass of the heavy truck cab according to the sprung masses of the left front and right front suspension coil spring shock absorbers and the distance between the left front and right front suspension coil spring shock absorbers;

[0067] The second left-right coordinate of the center of mass of the heavy truck cab is determined according to the sprung masses of the left rear and right rear suspension coil spring shock absorbers and the distance between the left rear and right rear suspension coil spring shock absorbers.

[0068] Furthermore, the processor 1001 may call a computer program stored in the memory 1005 and perform the following operations:

[0069] The step of determining the left-right coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers comprises:

[0070] A third straight line is determined according to the first left-right coordinate and the second left-right coordinate, and the left-right coordinate is determined according to the third straight line and the front-back coordinate.

[0071] Furthermore, the processor 1001 may call a computer program stored in the memory 1005 and perform the following operations:

[0072] Before the step of obtaining the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front, and right rear of the heavy truck cab, the method further includes:

[0073] Disassembling the suspension stabilizer bar and suspension swing arm assembly of the heavy truck cab;

[0074] Before the step of using the tilting hydraulic cylinder assembly of the heavy truck cab to flip the heavy truck cab, the method further includes:

[0075] Assemble the suspension stabilizer bar and suspension swing arm assembly of the heavy truck cab.

[0076] Furthermore, the processor 1001 may call a computer program stored in the memory 1005 and perform the following operations:

[0077] The step of obtaining the tilting angle of the heavy truck cab over the center of gravity includes:

[0078] During the process of using the tilting hydraulic cylinder assembly to tilt the heavy truck cab, a critical angle when the gravity torque of the tilting hydraulic cylinder assembly is zero is measured, and the critical angle is used as the tilting angle passing the center of gravity.

[0079] The embodiment of the present invention provides a method for measuring the mass center of a heavy truck cab. Figure 2 , Figure 2 This is a flow chart of the first embodiment of a method for calculating the center of mass of a heavy truck cab in real vehicle according to the present invention.

[0080] In this embodiment, the heavy truck cab is mounted on a suspension system, which includes a suspension coil spring shock absorber, a tilting hydraulic cylinder assembly, a suspension stabilizer bar and a suspension swing arm assembly. Figure 4 , Figure 4This is a schematic diagram of the cab and suspension rollover system structure, according to an embodiment of a method for calculating the center of mass of a heavy-duty truck cab. 1 is the cab, 2 is the front suspension stabilizer bar, 3 is the front suspension coil spring damper assembly, 4 is the front suspension swing arm assembly, 5 is the cab rollover hydraulic cylinder assembly, 6 is the vehicle frame, and 7 is the rear suspension coil spring damper assembly. The front suspension coil spring damper assembly 3 includes a left front suspension coil spring damper 32 and a right front suspension coil spring damper 31, while the front suspension coil spring damper assembly 7 includes a right rear suspension coil spring damper 71 and a right rear suspension coil spring damper 72.

[0081] The method for calculating the mass center of mass of the heavy truck cab on a real vehicle includes:

[0082] Step S10: Obtain the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front, and right rear of the heavy truck cab, and determine the total mass of the heavy truck cab based on the sprung masses.

[0083] Reference Figure 3 , Figure 3 This is a schematic diagram of the front-to-back and left-to-right coordinates of an embodiment of a method for calculating the center of mass of a heavy truck cab. Figure 3 Consider a top view of a heavy-duty truck cab. Below the cab are four coil spring shock absorbers: the left front, left rear, right front, and right rear. Obtain the sprung masses of these four coil spring shock absorbers. The sum of these sprung masses is the total mass of the heavy-duty truck cab.

[0084] Step S20: Determine the fore-aft coordinates and left-right coordinates of the center of mass of the heavy-duty truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers, and use the fore-aft direction and left-right direction of the heavy-duty truck cab when it is in the driving state as the fore-aft direction and left-right direction of the heavy-duty truck cab when performing actual vehicle measurement.

[0085] like Figure 3 As shown, the spacing between the suspension coil spring dampers includes the cab front-to-back suspension spacing L, the cab front suspension left-to-right spacing A, and the cab front suspension left-to-right spacing B. The fore-aft coordinate of the center of mass of the heavy-duty truck cab is X, and the left-to-right coordinate is Y. Based on the sprung mass of each suspension coil spring damper determined in step S10 and the spacing between the suspension coil spring dampers, the fore-aft coordinates and left-to-right coordinates of the center of mass of the heavy-duty truck cab can be determined using moment balance. In this embodiment, for ease of measurement, the fore-aft and left-to-right directions of the heavy-duty truck cab in the driving state are used as the fore-aft and left-to-right directions for actual vehicle measurements.

[0086] Step S30: flipping the heavy truck cab based on the flip hydraulic cylinder assembly of the heavy truck cab, and obtaining a flip angle of the heavy truck cab passing through the center of gravity when the torque of the flip hydraulic cylinder assembly is zero.

[0087] The cab flipping hydraulic cylinder assembly 5 supports the heavy truck cab 1 to flip it. After the cab flips over the center of gravity, it will flip forward freely to the final position. When the torque of the flipping hydraulic cylinder assembly is zero, the flip angle α of the heavy truck cab over the center of gravity is measured using an inclinometer.

[0088] Step S40: determining the height coordinate of the center of mass of the heavy truck cab according to the front-back coordinates and the flip angle.

[0089] Reference Figure 5 , Figure 5 This is a schematic diagram of a cab flipping method for calculating the center of mass of a heavy-duty truck cab according to one embodiment of the present invention. Using the flip angle α of the heavy-duty truck cab through the center of mass and the fore-aft coordinate of the center of mass of the heavy-duty truck cab as X, the height coordinate Z of the center of mass of the heavy-duty truck cab can be calculated: tanα = Z / X.

[0090] In this embodiment, the heavy-duty truck cab includes a suspension coil spring shock absorber, a flip hydraulic cylinder assembly, a suspension stabilizer bar and a suspension swing arm assembly, and the sprung load mass of the suspension coil spring shock absorbers at the left front, left rear, right front and right rear of the heavy-duty truck cab is obtained, and the total mass of the heavy-duty truck cab is determined based on the sprung load mass; the fore-aft coordinates and left-right coordinates of the center of mass of the heavy-duty truck cab are determined based on the sprung load mass and the distance between the suspension coil spring shock absorbers, and the fore-aft direction and left-right direction of the heavy-duty truck cab when in the driving state are used as the fore-aft direction and left-right direction of the heavy-duty truck cab when the actual vehicle measurement is performed; the heavy-duty truck cab is flipped based on the flip hydraulic cylinder assembly of the heavy-duty truck cab, and when the torque of the flip hydraulic cylinder assembly is zero, the flip angle of the heavy-duty truck cab passing the center of gravity is obtained; the height coordinate of the center of mass of the heavy-duty truck cab is determined based on the fore-aft coordinates and the flip angle.

[0091] Without the use of specialized testing equipment or dedicated fixtures, and without the need for separate cab assembly assembly, the mass and center of mass coordinates of the current heavy-duty truck cab can be quickly and accurately calculated. The measuring tools used include four coil spring dampers, an inclinometer, and a vernier caliper. The height change of each coil spring damper is measured to calculate the mass on the coil springs, and thus the cab mass. The fore-aft coordinate (X) of the center of mass is calculated by the distribution ratio of the mass on the front and rear suspensions. The left-right coordinate (Y) of the center of mass is calculated by the distribution ratio of the mass on the left and right suspensions. The inclinometer is used to measure the angle of the cab when it flips over the center of gravity, and the height coordinate (Z) of the center of mass is calculated.

[0092] Without specialized testing equipment or fixtures, nor the need for a separate cab assembly, simple equipment such as coil spring shock absorbers, an inclinometer, and a vernier caliper allows for quick and accurate calculation of the mass and center of mass coordinates of the currently configured cab in the complete vehicle state, facilitating subsequent use by engineering designers. This system is suitable for calculating the mass and center of mass coordinates of heavy-duty truck cabs equipped with four-point suspension and hydraulic tilting systems. This enables real-time measurement of cab mass and center of mass in the complete vehicle state, reducing the cost and cycle time of cab mass and center of mass measurements.

[0093] Optionally, the step of obtaining the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front, and right rear of the heavy truck cab includes:

[0094] Obtaining the actual height of the suspension coil spring shock absorber;

[0095] determining the actual bearing capacity of the suspension coil spring shock absorber according to the height difference between the designed installation height and the actual height of the heavy truck cab, the calibrated stiffness of the suspension coil spring shock absorber, and the calibrated bearing capacity at the designed installation height;

[0096] The sprung mass of the suspension coil spring damper is determined based on the actual load capacity.

[0097] The four coil spring dampers used in the measurement tool in this example have been calibrated for their spring stiffness and load-bearing capacity at the specified installation height. For example, the design installation height of a heavy-duty truck cab is 330 mm, and the calibrated load-bearing capacity at this design installation height is 3000 N. The calibrated stiffness of the custom coil spring is 40 N / mm. The actual height measured is 332 mm. Based on this, the force on the coil spring damper is reduced by (332 - 330) × 40 = 80 N, resulting in an actual load-bearing capacity of 2920 N, and a sprung mass of 2220 ÷ 9.8.

[0098] After customizing a suspension coil spring shock absorber with a calibrated load capacity of 3000N and a calibrated stiffness of 40N / mm at a designed installation height of 330mm, the customized suspension coil spring shock absorber can be used to measure the mass and center of mass of heavy-duty truck cabs of different specifications or models. At this time, only the height difference between the actual height and the designed installation height, such as 330mm, needs to be calculated. After changing different types of heavy-duty truck cabs, there is no need to customize the same set again, so only one set is needed, reducing the cost of measuring the mass and center of mass of heavy-duty truck cabs.

[0099] When heavy-duty trucks are equipped with air suspension or uncalibrated springs, it's necessary to remove the air suspension or uncalibrated springs and install custom, calibrated coil spring dampers to calculate the sprung mass. While this requires a disassembly and installation process, it's relatively simple and convenient. Compared to current methods for calculating the mass and center of gravity of heavy-duty truck cabs, which require transporting the entire cab assembly to a specialized facility and fabricating specialized fixtures, this method offers the advantages of lower cost and greater efficiency.

[0100] Optionally, the step of suspending the sprung mass of the coil spring shock absorber according to the actual load-bearing capacity comprises:

[0101] Obtaining an inclination angle of the suspension coil spring shock absorber;

[0102] The sprung mass is determined based on the actual load-bearing force and the inclination angle.

[0103] The tilted placement of the front and rear coil spring damper assemblies should take into account the leverage ratio. Specifically, when the coil spring damper is tilted, the leverage effect of the tilt angle must be considered. In actual installations, most coil spring dampers have a tilt angle. Therefore, after measuring the actual load, the precise sprung mass must be determined based on the actual load capacity and the tilt angle of the coil spring damper.

[0104] Optionally, the step of determining the fore-aft coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers comprises:

[0105] The sum of the sprung masses of the left front and right front suspension coil spring dampers is defined as the first mass, the sum of the sprung masses of the left rear and right rear suspension coil spring dampers is defined as the second mass, and the straight-line distance between the first straight line on which the left front and right front suspension coil spring dampers lie and the second straight line on which the left rear and right rear suspension coil spring dampers lie is defined as the fore-aft spacing;

[0106] The fore-aft coordinates of the center of mass of the heavy truck cab are determined according to the first mass, the second mass and the fore-aft distance.

[0107] like Figure 3 As shown, the fore-aft coordinate X of the center of mass is calculated based on the moment balance by the distribution ratio of the sprung masses of the left and right front coil spring shock absorbers and the sprung masses of the left and right rear coil spring shock absorbers, as well as the front-rear suspension distance L of the cab. Specifically, the sum of the sprung masses of the left front and right front suspension coil spring shock absorbers is taken as the first mass, which can be understood as the front mass of the heavy truck cab. The sum of the sprung masses of the left rear and right rear suspension coil spring shock absorbers is taken as the second mass, which can be understood as the rear mass of the heavy truck cab. Among them, the straight lines on which the left front and right front suspension coil spring shock absorbers and the left rear and right rear suspension coil spring shock absorbers are located must be parallel lines, and the straight-line distance based on the straight lines on which they are located is the fore-aft spacing, that is, Figure 3 The front-to-back suspension spacing L in the figure is as follows: Then, according to the first mass, the second mass and the front-to-back spacing, the front-to-back coordinate X of the center of mass of the heavy truck cab can be determined according to moment balance.

[0108] Optionally, before the step of determining the left-right coordinates of the center of mass of the heavy truck cab according to the sprung mass and the spacing between the suspension coil spring shock absorbers, the method further includes:

[0109] determining a first left-right coordinate of the center of mass of the heavy truck cab according to the sprung masses of the left front and right front suspension coil spring shock absorbers and the distance between the left front and right front suspension coil spring shock absorbers;

[0110] The second left-right coordinate of the center of mass of the heavy truck cab is determined according to the sprung masses of the left rear and right rear suspension coil spring shock absorbers and the distance between the left rear and right rear suspension coil spring shock absorbers.

[0111] like Figure 3 As shown, the first left-right coordinate Y is calculated based on the moment balance by the distribution ratio of the mass on the left coil spring shock absorber of the front suspension to the mass on the right coil spring shock absorber of the front suspension, and the left-right distance A of the cab front suspension. f .

[0112] The second left-right coordinate Y is calculated based on the moment balance by the distribution ratio of the mass on the left coil spring shock absorber of the rear suspension and the mass on the right coil spring shock absorber of the rear suspension, as well as the left-right spacing B of the cab front suspension. r .

[0113] Optionally, the step of determining the left-right coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers comprises:

[0114] A third straight line is determined according to the first left-right coordinate and the second left-right coordinate, and the left-right coordinate is determined according to the third straight line and the front-back coordinate.

[0115] like Figure 3 As shown, the first left-right coordinate Y f and the second left-right coordinate Y r The intersection of the line connecting the two and the front and rear coordinates X of the center of mass is the left and right coordinates of the center of mass. Thus, the final accurate left and right coordinates are calculated by the two front and rear left and right coordinates, eliminating the error caused by the imbalance of the heavy truck cab itself on the left and right coordinates. Specifically, when determining the first left and right coordinate Y f The second left and right coordinate Y r Afterwards, a third straight line can be determined based on these two points, and then the intersection of the third straight line and the vertical line of the front-back coordinate can be determined. The intersection is the coordinate of the center of mass in the horizontal plane, and the left-right coordinate Y can be determined based on the intersection.

[0116] Optionally, before the step of obtaining the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front and right rear of the heavy truck cab, the method further includes:

[0117] Disassembling the suspension stabilizer bar and suspension swing arm assembly of the heavy truck cab;

[0118] Before the step of flipping the heavy truck cab based on the flip hydraulic cylinder assembly of the heavy truck cab, the method further includes:

[0119] Assemble the suspension stabilizer bar and suspension swing arm assembly of the heavy truck cab.

[0120] like Figure 4 As shown, before calculating the sprung masses of the left front, left rear, right front, and right rear coil spring shock absorbers on the heavy-duty truck cab, the cab's stabilizer bar and suspension swing arm assembly must be disassembled. Specifically, when calculating the sprung masses of the two left-side coil spring shock absorbers, the left-side cab front stabilizer bar 2 and front suspension swing arm assembly 4 are disassembled, while the right-side front stabilizer bar and front suspension swing arm assembly remain unchanged. This eliminates the axle load transfer effect caused by the stabilizer bar.

[0121] Before using the heavy truck cab's tilting hydraulic cylinder assembly to flip the heavy truck cab, since the heavy truck cab needs to be flipped, the heavy truck cab's suspension stabilizer bar and suspension swing arm assembly need to be assembled to fix the heavy truck cab and prevent it from tipping over.

[0122] Optionally, the step of obtaining the rollover angle of the heavy truck cab passing the center of gravity includes:

[0123] During the process of using the tilting hydraulic cylinder assembly to tilt the heavy truck cab, a critical angle when the gravity torque of the tilting hydraulic cylinder assembly is zero is measured, and the critical angle is used as the tilting angle passing the center of gravity.

[0124] like Figure 5 As shown, when obtaining the flip angle of the heavy truck cab passing the center of gravity, due to the characteristic that the cab will freely flip forward to the final position after flipping over the center of gravity, at the critical angle of the flip hydraulic cylinder assembly, its gravity torque is zero. At this time, the center of gravity (center of mass) is just above the flip point. The critical angle of the heavy truck cab passing the center of gravity, i.e., the flip angle α, can be measured using an inclinometer. Therefore, the flip angle α can be measured by flipping the heavy truck cab using the flip hydraulic cylinder assembly that comes with the heavy truck cab. Based on the flip angle and the forward and backward coordinates of the center of mass of the heavy truck cab as X, the height coordinate Z of the center of mass of the heavy truck cab can be calculated, tanα = Z / X. The height coordinate of the center of mass is thus obtained by simple, efficient, and low-cost calculation.

[0125] In addition, an embodiment of the present invention also provides a heavy-duty truck, which includes: a heavy-duty truck cab, a suspension coil spring shock absorber, a flip hydraulic cylinder assembly, a memory, a processor, and a computer program stored on the memory and runnable on the processor. The computer program is configured to implement the steps of the above-mentioned method for calculating the center of mass of the heavy-duty truck cab. The heavy-duty truck cab is installed on the suspension coil spring shock absorber and is flipped by the flip hydraulic cylinder assembly.

[0126] In addition, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned method for measuring the center of mass of the heavy-duty truck cab are implemented.

[0127] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0128] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0129] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0130] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for measuring the center of mass of a heavy truck cab, characterized by: The heavy truck cab is mounted on a suspension system, which includes a suspension coil spring shock absorber, a tilt hydraulic cylinder assembly, a suspension stabilizer bar, and a suspension swing arm assembly. The method for calculating the center of mass of the heavy truck cab on a real vehicle includes the following steps: Obtaining the sprung masses of coil spring shock absorbers at the left front, left rear, right front, and right rear suspensions of the heavy truck cab, and determining the total mass of the heavy truck cab based on the sprung masses; Determine the fore-aft coordinates and left-right coordinates of the center of mass of the heavy-duty truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers, and use the fore-aft direction and left-right direction of the heavy-duty truck cab in the driving state as the fore-aft direction and left-right direction of the heavy-duty truck cab during actual vehicle measurement. flipping the heavy truck cab based on the flip hydraulic cylinder assembly of the heavy truck cab, and obtaining a flip angle of the heavy truck cab passing through the center of gravity when the torque of the flip hydraulic cylinder assembly is zero; Determining the height coordinate of the center of mass of the heavy truck cab according to the front-back coordinate and the flip angle; The step of obtaining the tilting angle of the heavy truck cab over the center of gravity includes: During the process of using the tilting hydraulic cylinder assembly to tilt the heavy truck cab, a critical angle when the gravity torque of the tilting hydraulic cylinder assembly is zero is measured, and the critical angle is used as the tilting angle passing the center of gravity.

2. The method for calculating the center of mass of a heavy truck cab as claimed in claim 1, characterized in that: The step of obtaining the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front, and right rear of the heavy truck cab comprises: Obtaining the actual height of the suspension coil spring shock absorber; determining the actual bearing capacity of the suspension coil spring shock absorber according to the height difference between the designed installation height and the actual height of the heavy truck cab, the calibrated stiffness of the suspension coil spring shock absorber, and the calibrated bearing capacity at the designed installation height; The sprung mass of the suspension coil spring damper is determined based on the actual load capacity.

3. The method for calculating the center of mass of a heavy truck cab as claimed in claim 2, characterized in that: The step of suspending the sprung mass of the coil spring shock absorber according to the actual load capacity comprises: Obtaining an inclination angle of the suspension coil spring shock absorber; The sprung mass is determined based on the actual load-bearing force and the inclination angle.

4. The method for calculating the center of mass of a heavy truck cab as claimed in claim 1, characterized in that: The step of determining the fore-aft coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers comprises: The sum of the sprung masses of the left front and right front suspension coil spring dampers is defined as the first mass, the sum of the sprung masses of the left rear and right rear suspension coil spring dampers is defined as the second mass, and the straight-line distance between the first straight line on which the left front and right front suspension coil spring dampers lie and the second straight line on which the left rear and right rear suspension coil spring dampers lie is defined as the fore-aft spacing; The fore-aft coordinates of the center of mass of the heavy truck cab are determined according to the first mass, the second mass and the fore-aft distance.

5. The method for calculating the center of mass of a heavy truck cab as claimed in claim 1, characterized in that: Before the step of determining the left-right coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers, the method further includes: determining a first left-right coordinate of the center of mass of the heavy truck cab according to the sprung masses of the left front and right front suspension coil spring shock absorbers and the distance between the left front and right front suspension coil spring shock absorbers; The second left-right coordinate of the center of mass of the heavy truck cab is determined according to the sprung masses of the left rear and right rear suspension coil spring shock absorbers and the distance between the left rear and right rear suspension coil spring shock absorbers.

6. The method for calculating the center of mass of a heavy truck cab as claimed in claim 5, characterized in that: The step of determining the left-right coordinates of the center of mass of the heavy truck cab based on the sprung mass and the spacing between the suspension coil spring shock absorbers comprises: A third straight line is determined according to the first left-right coordinate and the second left-right coordinate, and the left-right coordinate is determined according to the third straight line and the front-back coordinate.

7. The method for calculating the center of mass of a heavy truck cab as claimed in claim 1, characterized in that: Before the step of obtaining the sprung masses of the coil spring shock absorbers suspended at the left front, left rear, right front, and right rear of the heavy truck cab, the method further includes: Disassembling the suspension stabilizer bar and suspension swing arm assembly of the heavy truck cab; Before the step of flipping the heavy truck cab based on the flip hydraulic cylinder assembly of the heavy truck cab, the method further includes: Assemble the suspension stabilizer bar and suspension swing arm assembly of the heavy truck cab.

8. A heavy truck, characterized in that: The heavy-duty truck includes: a heavy-duty truck cab, a suspension coil spring shock absorber, a flip hydraulic cylinder assembly, a memory, a processor, and a computer program stored in the memory and runnable on the processor. The computer program is configured to implement the steps of the real vehicle measurement method for the center of mass of the heavy-duty truck cab as described in any one of claims 1 to 7. The heavy-duty truck cab is installed on the suspension coil spring shock absorber and is flipped by the flip hydraulic cylinder assembly.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the method for measuring the center of mass of a heavy truck cab as claimed in any one of claims 1 to 7.

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