Height adjusting method, equipment and device for steel plate spring suspension and storage medium

Abstract

The invention discloses a height adjusting method, device and equipment for a steel plate spring suspension and a storage medium, and the method comprises the steps: generating a first balance equation according to the compression amount of a spring, the calculated axle end reaction force of a suspension spring and the preset suspension spring stiffness; establishing a coordinate system, and generating a second balance equation and a third balance equation according to the moment balance of the axle ends of the four springs of the front and rear suspensions around the y axis, the moment balance of the axle ends of the four springs of the left and right suspensions around the y axis, the compression amount of the springs, the counter-force of the axle ends of the springs of the suspensions and the rigidity of the springs of the suspensions; calculating the compression amount of the spring according to a preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation; according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width, the difference value is calculated so that the vehicle body can be in a balanced state, and the problems that the fine difference of the vehicle body height cannot be manually and accurately judged, and the vehicle body cannot be adjusted to reach the balanced state are solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method, device, equipment and computer-readable storage medium for adjusting the height of a leaf spring suspension. Background Art

[0002] In the field of modern automobile engineering, the driving performance of a vehicle is closely related to the stability of its body posture. As the key load-bearing structure of the vehicle, the body must maintain the same height on both sides to ensure good handling, driving stability and ride comfort. However, in the actual production process, the problem of skewness due to unequal heights on the left and right sides of the body often occurs, which has many negative effects on the overall performance of the vehicle. From the perspective of vehicle design and manufacturing, although various measures have been taken during the production process to ensure the symmetry of the body structure and the accuracy of component installation, it is still difficult to completely eliminate the problem of body skewness due to the combined effect of multiple factors.

[0003] At present, the common detection and solution methods for the problem of uneven height and skewness on the left and right sides of the vehicle body have certain limitations. In terms of detection, the traditional manual visual detection method is highly subjective and it is difficult to accurately judge the slight difference in vehicle height; or, equipment such as four-wheel alignment instruments are used for detection, but these devices mainly focus on measuring the positioning parameters of the wheels, and have limited detection accuracy for the overall height difference of the vehicle body, and cannot fully adjust the vehicle body to a balanced state. Summary of the invention

[0004] The present application provides a height adjustment method, device, equipment and computer-readable storage medium for a leaf spring suspension, which can solve the technical problems in the prior art that it is difficult to accurately judge the slight differences in vehicle height and cannot fully adjust the vehicle body to a balanced state.

[0005] In a first aspect, an embodiment of the present application provides a method for adjusting the height of a leaf spring suspension, the method for adjusting the height of a leaf spring suspension comprising:

[0006] A first equilibrium equation is generated according to the compression amount of the spring, the calculated suspension spring axle end reaction force and the preset suspension spring stiffness, wherein the suspension spring axle end reaction force includes the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force, the preset suspension spring stiffness includes the left front suspension spring stiffness, the right front suspension spring stiffness, the left rear suspension spring stiffness and the right rear suspension spring stiffness, and the compression amount of the spring includes the compression amount of the left front spring, the compression amount of the right front spring, the compression amount of the left rear spring and the compression amount of the right rear spring;

[0007] A coordinate system is established, and the second equilibrium equation and the third equilibrium equation are generated according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the axle end of the suspension spring, and the stiffness of the suspension spring;

[0008] Calculating the compression amount of the spring according to the preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation;

[0009] According to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width, the difference is calculated to adjust the pad thickness or the leaf spring arc height to make the vehicle body in a balanced state.

[0010] In combination with the first aspect, in one implementation, the suspension spring axle end reaction force includes a left front suspension spring axle end reaction force, a right front suspension spring axle end reaction force, a left rear suspension spring axle end reaction force, and a right rear suspension spring axle end reaction force; the calculated suspension spring axle end reaction force includes:

[0011] According to the preset left front wheel load, preset right front wheel load and preset front axle unsprung mass of the vehicle suspension, the left front wheel center end load mass and the right front wheel center end load mass are calculated;

[0012] According to the preset left rear wheel load, preset right rear wheel load and preset rear axle unsprung mass of the vehicle suspension, the left rear wheel center end load mass and the right rear wheel center end load mass are calculated;

[0013] According to the left front wheel center end load mass, the right front wheel center end load mass, the preset front wheel track, and the preset front spring center distance, respectively calculating the left front suspension spring axle end reaction force and the right front suspension spring axle end reaction force;

[0014] According to the left rear wheel center end load mass, the right rear wheel center end load mass, the preset rear wheel track, and the preset rear spring center distance, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force are calculated respectively.

[0015] In combination with the first aspect, in one implementation, the establishing of the coordinate system generates a second equilibrium equation and a third equilibrium equation according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the preset suspension spring stiffness, including:

[0016] Establish a coordinate system and determine the relative position of the sprung mass center of gravity O on the x-axis based on the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis;

[0017] generating a second equilibrium equation according to the relative position of the sprung mass center of gravity O on the x-axis, the compression of the spring, the axle end reaction force of the suspension spring, and the preset suspension spring stiffness;

[0018] According to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, determine the relative position of the sprung mass center of gravity O on the y-axis;

[0019] A third equilibrium equation is generated according to the relative position of the sprung mass center of gravity O on the y-axis, the compression amount of the spring, the suspension spring axle end reaction force, the preset spring center distance and the preset suspension spring stiffness.

[0020] In combination with the first aspect, in one implementation, determining the relative position of the sprung mass center of gravity O on the x-axis according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis includes:

[0021] According to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the reaction force of the left front suspension spring axle end, the reaction force of the right front suspension spring axle end, the reaction force of the left rear suspension spring axle end, the reaction force of the right rear suspension spring axle end and the total reaction force of the suspension spring axle end are obtained;

[0022] Calculating a first relative position of the sprung mass center of gravity O on the x-axis according to the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the preset wheelbase and the suspension spring axle end total reaction force;

[0023] A second relative position of the sprung mass center of gravity O on the x-axis is calculated based on the left rear suspension spring axle end reaction force, the right rear suspension spring axle end reaction force, the preset wheelbase and the suspension spring axle end total reaction force.

[0024] In combination with the first aspect, in one implementation, determining the relative position of the sprung mass center of gravity O on the y-axis according to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis includes:

[0025] According to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the reaction force of the left front suspension spring axle end, the reaction force of the right front suspension spring axle end, the reaction force of the left rear suspension spring axle end, the reaction force of the right rear suspension spring axle end and the total reaction force of the suspension spring axle end are obtained;

[0026] The relative position of the sprung mass center of gravity O on the y-axis is calculated based on the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force, the right rear suspension spring axle end reaction force, the suspension spring axle end total reaction force and the preset spring center distance.

[0027] In combination with the first aspect, in one implementation, the compression amount of the spring includes the compression amount of the left front spring and the compression amount of the right front spring, and the preset front spring center distance includes the preset front spring center distance; and the difference is calculated according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width to adjust the pad thickness or the leaf spring arc height so that the vehicle body is in a balanced state, including:

[0028] Calculating the left-right difference at the front axle according to the compression amount of the left front spring, the compression amount of the right front spring, the preset front spring center distance, and the preset vehicle body outer edge width;

[0029] The pad thickness or the leaf spring arc height is adjusted by the left and right difference at the front axle to keep the vehicle body in a balanced state.

[0030] In combination with the first aspect, in one implementation, the compression amount of the spring includes the compression amount of the left rear spring and the compression amount of the right rear spring, and the preset spring center distance includes the preset rear spring center distance; the difference is calculated according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width to adjust the pad thickness or the leaf spring arc height so that the vehicle body is in a balanced state, including:

[0031] Calculating the left-right difference at the rear axle according to the compression amount of the left rear spring, the compression amount of the right rear spring, the preset rear spring center distance, and the preset vehicle body outer edge width;

[0032] The pad thickness or the leaf spring arc height is adjusted by the left and right difference at the rear axle to keep the vehicle body in a balanced state.

[0033] In a second aspect, an embodiment of the present application provides a height adjustment device for a leaf spring suspension, the height adjustment device for a leaf spring suspension comprising:

[0034] A first generating module is used to generate a first equilibrium equation according to the compression amount of the spring, the calculated suspension spring axle end reaction force and the preset suspension spring stiffness;

[0035] The second generation module is used to establish a coordinate system, and generate the second balance equation and the third balance equation according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the stiffness of the suspension spring;

[0036] A calculation module, used for calculating the compression amount of the spring according to the preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation;

[0037] The calculation and adjustment module is used to calculate the difference according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width, and adjust the pad thickness or the leaf spring arc height to make the vehicle body in a balanced state.

[0038] In a third aspect, an embodiment of the present application provides a height adjustment device for a leaf spring suspension, the height adjustment device for the leaf spring suspension comprising a processor, a memory, and a height adjustment program for the leaf spring suspension stored in the memory and executable by the processor, wherein when the height adjustment program for the leaf spring suspension is executed by the processor, the steps of the height adjustment method for the leaf spring suspension as described above are implemented.

[0039] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a height adjustment program for a leaf spring suspension is stored, wherein when the height adjustment program for the leaf spring suspension is executed by a processor, the steps of the height adjustment method for the leaf spring suspension as described above are implemented.

[0040] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0041] The first balance equation is generated according to the compression of the spring, the calculated reaction force of the suspension spring axle end and the preset suspension spring stiffness; a coordinate system is established, and the second balance equation and the third balance equation are generated according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end and the suspension spring stiffness; the compression of the spring is calculated according to the preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation; according to the compression of the spring, the preset spring center distance and the preset vehicle body outer edge width, the difference is calculated to adjust the pad thickness or the leaf spring arc height so that the vehicle body is in a balanced state, which solves the technical problem in the related art that it is difficult to accurately judge the slight difference in vehicle body height and cannot fully adjust the vehicle body to a balanced state. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic flow chart of a first embodiment of a method for adjusting the height of a leaf spring suspension of the present application;

[0043] Figure 2 is a schematic diagram of the position of the sprung mass center on the x-axis in this application;

[0044] Figure 3 is a schematic diagram of the position of the sprung mass center on the y-axis in this application;

[0045] Figure 4This is a functional module diagram of an embodiment of a height adjustment device for a leaf spring suspension of the present application;

[0046] Figure 5 This is a schematic diagram of the hardware structure of the height adjustment device of the leaf spring suspension involved in the embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] First, some technical terms in the present application are explained to facilitate those skilled in the art to understand the present application.

[0049] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0050] In a first aspect, an embodiment of the present application provides a method for adjusting the height of a leaf spring suspension.

[0051] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the height adjustment method of the leaf spring suspension of the present application. Figure 1 As shown, the height adjustment method of the leaf spring suspension includes:

[0052] Step S10: generating a first equilibrium equation according to the compression amount of the spring, the calculated suspension spring axle end reaction force and the preset suspension spring stiffness;

[0053] Exemplarily, the suspension spring axle end reaction force includes the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force, the preset suspension spring stiffness includes the left front suspension spring stiffness, the right front suspension spring stiffness, the left rear suspension spring stiffness and the right rear suspension spring stiffness, and the spring compression includes the left front spring compression, the right front spring compression, the left rear spring compression and the right rear spring compression. According to the spring compression, the calculated suspension spring axle end reaction force and the preset suspension spring stiffness, the first equilibrium equation F1+F2+F3+F4-(k1a z +k2o z +k3c z +k4b z)=0, where F1 is the spring axle end reaction force of the left front suspension, F2 is the spring axle end reaction force of the right front suspension, F3 is the spring axle end reaction force of the left rear suspension, F4 is the spring axle end reaction force of the right rear suspension, k1 is the spring stiffness of the left front suspension, k2 is the spring stiffness of the right front suspension, k3 is the spring stiffness of the left rear suspension, k4 is the spring stiffness of the right rear suspension, a z is the compression of the left front spring, o z is the compression of the right front spring, c z is the compression of the left rear spring, b z is the compression of the right rear spring.

[0054] Specifically, the calculated suspension spring axle-end reaction force includes: calculating the left front wheel center end load and the right front wheel center end load according to the preset left front wheel load, the preset right front wheel load and the preset front spring center distance of the vehicle suspension; calculating the left rear wheel center end load and the right rear wheel center end load according to the preset left rear wheel load, the preset right rear wheel load and the preset rear spring center distance of the vehicle suspension; calculating the left rear suspension spring axle-end reaction force and the right rear suspension spring axle-end reaction force according to the right front wheel center end load, the right front wheel center end load, the preset front wheel track and the preset front spring center distance; calculating the left front suspension spring axle-end reaction force and the right front suspension spring axle-end reaction force according to the left rear wheel center end load, the right rear wheel center end load, the preset rear wheel track and the preset rear spring center distance.

[0055] Exemplarily, the left front wheel center end load and the right front wheel center end load are calculated according to the preset left front wheel load, the preset right front wheel load and the preset front spring center distance of the vehicle suspension. Exemplarily, the left front wheel center end load is calculated according to the preset left front wheel load and the preset front spring center distance of the vehicle suspension; the right front wheel center end load is calculated according to the preset right front wheel load and the preset front spring center distance of the vehicle suspension. For example, the formula G1-0.5mu is obtained. f =mt1, where G1 is the preset left front wheel load, mu f is the unsprung mass of the front axle, and mt1 is the mass at the left front wheel center. Get the formula G2-0.5mu f =mt2, where G2 is the preset right front wheel load, mu f is the unsprung mass of the front axle, and mt2 is the load on the right front wheel center.

[0056] According to the preset left rear wheel load, preset right rear wheel load and preset rear axle unsprung mass of the vehicle suspension, the left rear wheel center end load and the right rear wheel center end load are calculated. For example, according to the preset left rear wheel load and preset rear axle unsprung mass of the vehicle suspension, the left rear wheel center end load is calculated; according to the preset right rear wheel load and preset rear axle unsprung mass of the vehicle suspension, the right rear wheel center end load is calculated. For example, get G3-0.5mu r=mt3, where G3 is the preset left rear wheel load, mu r is the unsprung mass of the rear axle, and mt3 is the mass at the left rear wheel center. Get G4-0.5mu r =mt4, where G4 is the preset left rear wheel load, mu r is the unsprung mass of the rear axle, and mt4 is the load mass at the left rear wheel center.

[0057] According to the left front wheel center end load mass, the right front wheel center end load mass, the preset front wheel track, and the preset front spring center distance, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force are calculated respectively; for example, according to the left front wheel center end load mass mt1, the preset front wheel track T f , Preset front spring center distance B f , generating the first equation -mt1T f +F1'(B f +Δf1)+F2'Δf1=0, where Δf1=0.5(T f -B f ). According to the right front wheel center end load mass mt2, preset front wheel distance T f , Preset front spring center distance B f , generating the second equation mt2T f -F1'Δf1-F2'(B f +Δf1)=0. According to the first equation and the second equation, F1' and F2' are obtained. Reversing the directions of F1' and F2', the left front suspension spring axle end reaction force F1 and the right front suspension spring axle end reaction force F2 are obtained.

[0058] According to the left rear wheel center end load mass, the right rear wheel center end load mass, the preset rear wheel track, and the preset rear spring center distance, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force are calculated respectively. r , Preset spring center distance B r , generate third-party program-mt3T r +F3'(B r +Δf2)+F4'Δf2=0, where Δf2=0.5(T r -B r ). According to the right rear wheel center end load mass mt4, the rear wheelbase T is preset. r , Preset spring center distance B r , generating the fourth equation mt4T r -F3'Δf2-F4'(B r+Δf2)=0. According to the third equation and the fourth equation, F3' and F4' are obtained. The directions of F3' and F4' are reversed to obtain the left rear suspension spring axle end reaction force F3 and the right rear suspension spring axle end reaction force F4.

[0059] Step S20: Establishing a coordinate system, generating a second equilibrium equation and a third equilibrium equation according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the stiffness of the suspension spring;

[0060] Demonstratively, a coordinate system is established, and the four points at both ends of the automobile suspension spring are always in the same plane. The second equilibrium equation is generated according to the torque balance of the four spring axle ends of the front and rear suspensions around the y-axis, the compression of the springs, the reaction force of the axle ends of the suspension springs, and the stiffness of the suspension springs; the third equilibrium equation is generated according to the torque balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the springs, the reaction force of the axle ends of the suspension springs, and the stiffness of the suspension springs.

[0061] Specifically, the establishing of the coordinate system generates the second balance equation and the third balance equation according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the preset suspension spring stiffness, including: establishing the coordinate system, determining the relative position of the sprung mass center of gravity O on the x-axis according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis; generating the second balance equation according to the relative position of the sprung mass center of gravity O on the x-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the preset suspension spring stiffness; determining the relative position of the sprung mass center of gravity O on the y-axis according to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis; generating the third balance equation according to the relative position of the sprung mass center of gravity O on the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the preset suspension spring stiffness.

[0062] Exemplarily, the relative position of the sprung mass center of gravity O on the x-axis is determined based on the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis. Figure 2As shown, according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the left front suspension spring axle end reaction force F1, the right front suspension spring axle end reaction force F2, the left rear suspension spring axle end reaction force F3, the right rear suspension spring axle end reaction force F4 and the suspension spring axle end total reaction force F are obtained, wherein F=F1+F2+F3+F4; according to the left front suspension spring axle end reaction force F1, the right front suspension spring axle end reaction force F2, the preset wheelbase L and the suspension spring axle end total reaction force F, the first relative position a of the sprung mass center of gravity O on the x-axis is calculated. For example, the first relative position a of the sprung mass center of gravity O on the x-axis is calculated by the formula a=(F1+F2)LF. The second relative position of the sprung mass center of gravity O on the x-axis is calculated based on the left rear suspension spring axle end reaction force F3, the right rear suspension spring axle end reaction force F4, the preset wheelbase L and the suspension spring axle end total reaction force F. For example, the second relative position of the sprung mass center of gravity O on the x-axis is calculated by the formula b = (F3 + F4) LF. The second equilibrium equation (F1-k1a) is generated based on the relative positions a and b of the sprung mass center of gravity O on the x-axis, the compression of the spring, the suspension spring axle end reaction force and the preset suspension spring stiffness. z )a+(F2-k2o z )a+(F3-k3c z )b+(F4-k4b z )b=0, wherein the suspension spring axle end reaction force includes the left front suspension spring axle end reaction force F1, the right front suspension spring axle end reaction force F2, the left rear suspension spring axle end reaction force F3 and the right rear suspension spring axle end reaction force F4, the preset suspension spring stiffness includes the left front suspension spring stiffness K1, the right front suspension spring stiffness K2, the left rear suspension spring stiffness K3 and the right rear suspension spring stiffness K4, and the spring compression includes the left front spring compression a z , compression of right front spring o z , compression of the left rear spring c z and the compression of the right rear spring b z .

[0063] According to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the relative position of the sprung mass center of gravity O on the y-axis is determined. Figure 3 As shown, according to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the left front suspension spring axle end reaction force F1, the right front suspension spring axle end reaction force F2, the left rear suspension spring axle end reaction force F3, the right rear suspension spring axle end reaction force F4 and the suspension spring axle end total reaction force F are obtained; according to the left front suspension spring axle end reaction force F1, the right front suspension spring axle end reaction force F2, the left rear suspension spring axle end reaction force F3, the right rear suspension spring axle end reaction force F4, the suspension spring axle end total reaction force F and the preset spring center distance, the relative position of the sprung mass center of gravity O on the y-axis is calculated as x=0.5[Bf (F2-F1)+B r (F3-F4)]F, where the preset spring center distance includes the front spring center distance B f and rear spring center distance B r The third equilibrium equation (F2-k2o2)(0.5B) is generated based on the relative position x of the center of gravity O of the sprung mass on the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, the preset spring center distance and the preset suspension spring stiffness. f -x)+(F4-k4b2)(0.5B r -x)-(F1-k1a2)(0.5B f +x)-(F3-k3c2)(0.5B r +x)=0, wherein the suspension spring axle end reaction force includes the left front suspension spring axle end reaction force F1, the right front suspension spring axle end reaction force F2, the left rear suspension spring axle end reaction force F3 and the right rear suspension spring axle end reaction force F4, the preset suspension spring stiffness includes the left front suspension spring stiffness K1, the right front suspension spring stiffness K2, the left rear suspension spring stiffness K3 and the right rear suspension spring stiffness K4, and the spring compression includes the left front spring compression amount a z , compression of right front spring o z , compression of the left rear spring c z and the compression of the right rear spring b z Preset spring center

[0064] Distance including front spring center distance B f and rear spring center distance B r .

[0065] Step S30: calculating the compression amount of the spring according to the preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation;

[0066] Exemplarily, obtain the preset plane constraint auxiliary equation

[0067] To facilitate the calculation of vectors, temporarily translate the coordinate system O along the x-axis to the top of the left spring of the front axle. Assuming that the original length of the spring is zero, the deformation of the spring is the z-coordinate value after static equilibrium. The coordinates of the four points OABC after static equilibrium are O(0,0.5Bf,oz), A(0,-0.5Bf,az), B(L,0.5Br,bz), C(L,-0.5Br,cz). Assume In order to ensure that the four points OABC are in the same plane, the mixed product of the three vectors a, b, and c can be zero. The necessary and sufficient condition for the three vectors a, b, and c to be coplanar is that their mixed product [abc] = 0.

[0068] Auxiliary equations by presetting plane constraints The first equilibrium equation is F1+F2+F3+F4-(k1a z +k2o z +k3c z +k4b z )=0, the second equilibrium equation (F1-k1a z )a+(F2-k2o z )a+(F3-k3c z )b+(F4-k4b z )b=0 and the third equilibrium equation (F2-k2o2)(0.5B f -x)+(F4-k4b2)(0.5B r -x)-(F1-k1a2)(0.5B f +x)-(F3-k3c2)(0.5B r +x)=0, calculate the compression of the spring, which includes the compression of the left front spring a z , compression of right front spring o z , compression of the left rear spring c z and the compression of the right rear spring b z .

[0069] Step S40: Calculate the difference according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width to adjust the pad thickness or the leaf spring arc height so that the vehicle body is in a balanced state.

[0070] Exemplarily, the compression amount of the spring includes the compression amount of the left front spring and the compression amount of the right front spring, and the preset front spring center distance includes the preset front spring center distance; according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width, the difference is calculated to adjust the pad thickness or the leaf spring arc height so that the vehicle body is in a balanced state, including: according to the compression amount of the left front spring a z , compression of right front spring o z , Preset front spring center distance B f And the preset body outer edge width W, calculate the left and right difference ΔH1 at the front axle, for example, get the formula The left-right difference ΔH1 at the front axle is calculated. The thickness of the pad or the arc height of the leaf spring is adjusted according to the left-right difference at the front axle to keep the vehicle body in a balanced state.

[0071] The compression amount of the spring includes the compression amount of the left rear spring and the compression amount of the right rear spring, and the preset spring center distance includes the preset rear spring center distance; according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width, the difference is calculated to adjust the pad thickness or the leaf spring arc height to make the vehicle body in a balanced state, including: according to the compression amount c of the left rear spring z , compression of right rear spring b z , Preset spring center distance B r And preset the outer edge width W of the vehicle body, calculate the left and right difference ΔH2 at the rear axle, for example, for example, obtain the formula The left-right difference ΔH2 at the rear axle is calculated. The thickness of the pad or the arc height of the leaf spring is adjusted according to the left-right difference at the rear axle to keep the vehicle body in a balanced state.

[0072] In this embodiment, a first equilibrium equation is generated according to the compression of the spring, the calculated suspension spring axle end reaction force and the preset suspension spring stiffness, wherein the suspension spring axle end reaction force includes the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force, the preset suspension spring stiffness includes the left front suspension spring stiffness, the right front suspension spring stiffness, the left rear suspension spring stiffness and the right rear suspension spring stiffness, and the compression of the spring includes the compression of the left front spring, the compression of the right front spring, the compression of the left rear spring and the compression of the right rear spring; a coordinate system is established according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis. , the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end and the suspension spring stiffness, generate the second balance equation and the third balance equation; calculate the compression of the spring according to the preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation; calculate the difference according to the compression of the spring, the preset spring center distance and the preset vehicle body outer edge width to adjust the pad thickness or the leaf spring arc height to make the vehicle body in a balanced state, which solves the technical problem that it is difficult to accurately judge the slight difference in vehicle body height and cannot fully adjust the vehicle body to a balanced state in the related technology, reduces the workload of workers for offline adjustments and improves production efficiency.

[0073] In a second aspect, an embodiment of the present application also provides a height adjustment device for a leaf spring suspension.

[0074] In one embodiment, referring to Figure 4 , Figure 4 This is a functional module diagram of an embodiment of a height adjustment device for a leaf spring suspension of the present application. Figure 4 As shown, the height adjustment device of the leaf spring suspension includes:

[0075] A first generating module 10 is used to generate a first equilibrium equation according to the compression amount of the spring, the calculated suspension spring axle end reaction force and the preset suspension spring stiffness, wherein the suspension spring axle end reaction force includes the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force, the preset suspension spring stiffness includes the left front suspension spring stiffness, the right front suspension spring stiffness, the left rear suspension spring stiffness and the right rear suspension spring stiffness, and the compression amount of the spring includes the compression amount of the left front spring, the compression amount of the right front spring, the compression amount of the left rear spring and the compression amount of the right rear spring;

[0076] The second generation module 20 is used to establish a coordinate system, and generate a second equilibrium equation and a third equilibrium equation according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the stiffness of the suspension spring;

[0077] A calculation module 30, configured to calculate the compression amount of the spring according to the preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation;

[0078] The calculation and adjustment module 40 is used to calculate the difference according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width, and adjust the pad thickness or the leaf spring arc height to make the vehicle body in a balanced state.

[0079] Furthermore, in one embodiment, the first generating module 10 is used to:

[0080] According to the preset left front wheel load, preset right front wheel load and preset front axle unsprung mass of the vehicle suspension, the left front wheel center end load mass and the right front wheel center end load mass are calculated;

[0081] According to the preset left rear wheel load, preset right rear wheel load and preset rear axle unsprung mass of the vehicle suspension, the left rear wheel center end load mass and the right rear wheel center end load mass are calculated;

[0082] According to the left front wheel center end load mass, the right front wheel center end load mass, the preset front wheel track, and the preset front spring center distance, respectively calculating the left front suspension spring axle end reaction force and the right front suspension spring axle end reaction force;

[0083] According to the left rear wheel center end load mass, the right rear wheel center end load mass, the preset rear wheel track, and the preset rear spring center distance, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force are calculated respectively.

[0084] Furthermore, in one embodiment, the second generating module 20 is used to:

[0085] Establish a coordinate system and determine the relative position of the sprung mass center of gravity O on the x-axis based on the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis;

[0086] generating a second equilibrium equation according to the relative position of the sprung mass center of gravity O on the x-axis, the compression of the spring, the axle end reaction force of the suspension spring, and the preset suspension spring stiffness;

[0087] According to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, determine the relative position of the sprung mass center of gravity O on the y-axis;

[0088] A third equilibrium equation is generated according to the relative position of the sprung mass center of gravity O on the y-axis, the compression amount of the spring, the suspension spring axle end reaction force, the preset spring center distance and the preset suspension spring stiffness.

[0089] Furthermore, in one embodiment, the height adjustment device of the leaf spring suspension further includes a new module for:

[0090] According to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the reaction force of the left front suspension spring axle end, the reaction force of the right front suspension spring axle end, the reaction force of the left rear suspension spring axle end, the reaction force of the right rear suspension spring axle end and the total reaction force of the suspension spring axle end are obtained;

[0091] Calculating a first relative position of the sprung mass center of gravity O on the x-axis according to the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the preset wheelbase and the suspension spring axle end total reaction force;

[0092] A second relative position of the sprung mass center of gravity O on the x-axis is calculated based on the left rear suspension spring axle end reaction force, the right rear suspension spring axle end reaction force, the preset wheelbase and the suspension spring axle end total reaction force.

[0093] Furthermore, in one embodiment, the height adjustment device of the leaf spring suspension further includes a new module for:

[0094] According to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the reaction force of the left front suspension spring axle end, the reaction force of the right front suspension spring axle end, the reaction force of the left rear suspension spring axle end, the reaction force of the right rear suspension spring axle end and the total reaction force of the suspension spring axle end are obtained;

[0095] The relative position of the sprung mass center of gravity O on the y-axis is calculated based on the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force, the right rear suspension spring axle end reaction force, the suspension spring axle end total reaction force and the preset spring center distance.

[0096] Furthermore, in one embodiment, the calculation and adjustment module 40 is used to:

[0097] Calculating the left-right difference at the front axle according to the compression amount of the left front spring, the compression amount of the right front spring, the preset front spring center distance, and the preset vehicle body outer edge width;

[0098] The pad thickness or the leaf spring arc height is adjusted by the left and right difference at the front axle to keep the vehicle body in a balanced state.

[0099] Furthermore, in one embodiment, the calculation and adjustment module 40 is used to:

[0100] Calculating the left-right difference at the rear axle according to the compression amount of the left rear spring, the compression amount of the right rear spring, the preset rear spring center distance, and the preset vehicle body outer edge width;

[0101] The pad thickness or the leaf spring arc height is adjusted by the left and right difference at the rear axle to keep the vehicle body in a balanced state.

[0102] Among them, the functional implementation of each module in the above-mentioned height adjustment device of the leaf spring suspension corresponds to the various steps in the above-mentioned height adjustment method embodiment of the leaf spring suspension, and its functions and implementation processes will not be repeated here one by one.

[0103] In a third aspect, an embodiment of the present application provides a height adjustment device for a leaf spring suspension. The height adjustment device for the leaf spring suspension may be a personal computer (PC), a laptop computer, a server, or other device with a data processing function.

[0104] Reference Figure 5 , Figure 5 Schematic diagram of the hardware structure of the height adjustment device of the leaf spring suspension involved in the embodiment of the present application. In the embodiment of the present application, the height adjustment device of the leaf spring suspension may include a processor, a memory, a communication interface and a communication bus.

[0105] The communication bus may be of any type and is used to interconnect the processor, the memory, and the communication interface.

[0106] The communication interface includes an input / output (I / O) interface, a physical interface, and a logical interface, etc., which are used to interconnect the components inside the height adjustment device of the leaf spring suspension, and an interface used to interconnect the height adjustment device of the leaf spring suspension with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, an optical fiber interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[0107] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0108] The processor may be a general-purpose processor, which may call the height adjustment program of the leaf spring suspension stored in the memory and execute the height adjustment method of the leaf spring suspension provided in the embodiment of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the height adjustment program of the leaf spring suspension is called may refer to the various embodiments of the height adjustment method of the leaf spring suspension of the present application, which will not be described in detail here.

[0109] Those skilled in the art will understand that Figure 5 The hardware structure shown in the figure does not constitute a limitation on the present application, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0110] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0111] The computer-readable storage medium of the present application stores a height adjustment program for a leaf spring suspension, wherein when the height adjustment program for the leaf spring suspension is executed by a processor, the steps of the height adjustment method for the leaf spring suspension as described above are implemented.

[0112] Among them, the method implemented when the height adjustment program of the leaf spring suspension is executed can refer to the various embodiments of the height adjustment method of the leaf spring suspension of the present application, and will not be repeated here.

[0113] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are only for description and do not represent the advantages or disadvantages of the embodiments.

[0114] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit "first", "second" and "third" to different types.

[0115] In the description of the embodiments of the present application, "exemplary", "for example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary", "for example" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[0116] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or. For example, A / B can mean A or B. The “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0117] In some processes described in the embodiments of the present application, multiple operations or steps that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0118] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application 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, disk, CD) as described above, and includes a number of instructions for a terminal device to execute the methods described in each embodiment of the present application.

[0119] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for adjusting the height of a leaf spring suspension, characterized in that: The height adjustment method of the leaf spring suspension comprises: A first equilibrium equation is generated according to the compression amount of the spring, the calculated suspension spring axle end reaction force and the preset suspension spring stiffness, wherein the suspension spring axle end reaction force includes the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force, the preset suspension spring stiffness includes the left front suspension spring stiffness, the right front suspension spring stiffness, the left rear suspension spring stiffness and the right rear suspension spring stiffness, and the compression amount of the spring includes the compression amount of the left front spring, the compression amount of the right front spring, the compression amount of the left rear spring and the compression amount of the right rear spring; A coordinate system is established, and the second equilibrium equation and the third equilibrium equation are generated according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the axle end of the suspension spring, and the stiffness of the suspension spring; Calculating the compression amount of the spring according to the preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation; According to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width, the difference is calculated to adjust the pad thickness or the leaf spring arc height to make the vehicle body in a balanced state.

2. The method for adjusting the height of a leaf spring suspension according to claim 1, characterized in that: The suspension spring axle end reaction force includes a left front suspension spring axle end reaction force, a right front suspension spring axle end reaction force, a left rear suspension spring axle end reaction force and a right rear suspension spring axle end reaction force; the calculated suspension spring axle end reaction force includes: According to the preset left front wheel load, preset right front wheel load and preset front axle unsprung mass of the vehicle suspension, the left front wheel center end load mass and the right front wheel center end load mass are calculated; According to the preset left rear wheel load, preset right rear wheel load and preset rear axle unsprung mass of the vehicle suspension, the left rear wheel center end load mass and the right rear wheel center end load mass are calculated; According to the left front wheel center end load mass, the right front wheel center end load mass, the preset front wheel track, and the preset front spring center distance, respectively calculating the left front suspension spring axle end reaction force and the right front suspension spring axle end reaction force; According to the left rear wheel center end load mass, the right rear wheel center end load mass, the preset rear wheel track, and the preset rear spring center distance, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force are calculated respectively.

3. The height adjustment method of a leaf spring suspension according to claim 1, characterized in that: The coordinate system is established, and the second balance equation and the third balance equation are generated according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the preset suspension spring stiffness, including: Establish a coordinate system and determine the relative position of the sprung mass center of gravity O on the x-axis based on the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis; generating a second equilibrium equation according to the relative position of the sprung mass center of gravity O on the x-axis, the compression of the spring, the axle end reaction force of the suspension spring, and the preset suspension spring stiffness; According to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, determine the relative position of the sprung mass center of gravity O on the y-axis; A third equilibrium equation is generated according to the relative position of the sprung mass center of gravity O on the y-axis, the compression amount of the spring, the suspension spring axle end reaction force, the preset spring center distance and the preset suspension spring stiffness.

4. The method for adjusting the height of a leaf spring suspension according to claim 3, characterized in that: Determining the relative position of the sprung mass center of gravity O on the x-axis based on the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis includes: According to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the reaction force of the left front suspension spring axle end, the reaction force of the right front suspension spring axle end, the reaction force of the left rear suspension spring axle end, the reaction force of the right rear suspension spring axle end and the total reaction force of the suspension spring axle end are obtained; Calculating a first relative position of the sprung mass center of gravity O on the x-axis according to the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the preset wheelbase and the suspension spring axle end total reaction force; A second relative position of the sprung mass center of gravity O on the x-axis is calculated based on the left rear suspension spring axle end reaction force, the right rear suspension spring axle end reaction force, the preset wheelbase and the suspension spring axle end total reaction force.

5. The method for adjusting the height of a leaf spring suspension according to claim 3, characterized in that: Determining the relative position of the sprung mass center of gravity O on the y-axis based on the moment balance of the four spring axle ends of the left and right suspensions around the y-axis includes: According to the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the reaction force of the left front suspension spring axle end, the reaction force of the right front suspension spring axle end, the reaction force of the left rear suspension spring axle end, the reaction force of the right rear suspension spring axle end and the total reaction force of the suspension spring axle end are obtained; The relative position of the sprung mass center of gravity O on the y-axis is calculated based on the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force, the right rear suspension spring axle end reaction force, the suspension spring axle end total reaction force and the preset spring center distance.

6. The method for adjusting the height of a leaf spring suspension according to claim 1, wherein: The compression amount of the spring includes the compression amount of the left front spring and the compression amount of the right front spring, and the preset front spring center distance includes the preset front spring center distance; the difference is calculated according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width to adjust the pad thickness or the leaf spring arc height so that the vehicle body is in a balanced state, including: Calculating the left-right difference at the front axle according to the compression amount of the left front spring, the compression amount of the right front spring, the preset front spring center distance, and the preset vehicle body outer edge width; The pad thickness or the leaf spring arc height is adjusted by the left and right difference at the front axle to keep the vehicle body in a balanced state.

7. The method for adjusting the height of a leaf spring suspension according to claim 1, characterized in that: The compression amount of the spring includes the compression amount of the left rear spring and the compression amount of the right rear spring, and the preset spring center distance includes the preset rear spring center distance; the difference is calculated according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width to adjust the pad thickness or the leaf spring arc height so that the vehicle body is in a balanced state, including: Calculating the left-right difference at the rear axle according to the compression amount of the left rear spring, the compression amount of the right rear spring, the preset rear spring center distance, and the preset vehicle body outer edge width; The pad thickness or the leaf spring arc height is adjusted by the left and right difference at the rear axle to keep the vehicle body in a balanced state.

8. A height adjustment device for a leaf spring suspension, characterized in that: The height adjustment device of the leaf spring suspension comprises: a first generating module, for generating a first equilibrium equation according to the compression amount of the spring, the calculated suspension spring axle end reaction force and the preset suspension spring stiffness, wherein the suspension spring axle end reaction force includes the left front suspension spring axle end reaction force, the right front suspension spring axle end reaction force, the left rear suspension spring axle end reaction force and the right rear suspension spring axle end reaction force, the preset suspension spring stiffness includes the left front suspension spring stiffness, the right front suspension spring stiffness, the left rear suspension spring stiffness and the right rear suspension spring stiffness, and the compression amount of the spring includes the compression amount of the left front spring, the compression amount of the right front spring, the compression amount of the left rear spring and the compression amount of the right rear spring; The second generation module is used to establish a coordinate system, and generate the second balance equation and the third balance equation according to the moment balance of the four spring axle ends of the front and rear suspensions around the y-axis, the moment balance of the four spring axle ends of the left and right suspensions around the y-axis, the compression of the spring, the reaction force of the suspension spring axle end, and the stiffness of the suspension spring; A calculation module, used for calculating the compression amount of the spring according to the preset plane constraint auxiliary equation, the first balance equation, the second balance equation and the third balance equation; The calculation and adjustment module is used to calculate the difference according to the compression amount of the spring, the preset spring center distance and the preset vehicle body outer edge width, and adjust the pad thickness or the leaf spring arc height to make the vehicle body in a balanced state.

9. A height adjustment device for a leaf spring suspension, characterized in that: The height adjustment device of the leaf spring suspension includes a processor, a memory, and a height adjustment program of the leaf spring suspension stored in the memory and executable by the processor, wherein when the height adjustment program of the leaf spring suspension is executed by the processor, the steps of the height adjustment method of the leaf spring suspension as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a height adjustment program for a leaf spring suspension, wherein when the height adjustment program for a leaf spring suspension is executed by a processor, the steps of the height adjustment method for a leaf spring suspension according to any one of claims 1 to 7 are implemented.

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