Commercial vehicle full-floating cab suspension virtual KC test method and system

Abstract

The invention provides a full-floating cab suspension virtual Kamp of a commercial vehicle. The invention discloses a test method and system. The method comprises the steps that a virtual Kamp of a full-floating cab suspension of a commercial vehicle is built; c, a test bed; a virtual Kamp based on the built full-floating cab suspension of the commercial vehicle; c, a test bed: Kamp is carried out in sequence; c, testing; according to test record data, K characteristic relation curves or C characteristic relation curves at the wheel centers of the left and right wheels of the front axle and the left and right wheels of the rear axle under each test condition are generated, and the virtual Kamp of the full-floating cab suspension of the commercial vehicle is effectively reduced; c, testing the cost.

Description

Technical Field

[0001] The present invention relates to the field of automobile assembly characteristic testing, and in particular to a virtual K&C testing method and system for a commercial vehicle full-floating cab suspension. Background Art

[0002] As people continue to pursue a better life, commercial vehicle users have higher requirements for vehicle ride comfort and drivability, and the adoption rate of full-floating cabs with better quality has also increased. The cab suspension is the final link in transmitting vehicle motion to the driver. The quality of its vibration reduction and vibration isolation directly affects the objective performance indicators of the vehicle and the driver's subjective evaluation of vehicle performance. Therefore, research on the cab suspension is crucial.

[0003] However, currently at home and abroad, most of the test benches and test methods are for the fatigue performance of full-floating cab suspension. There is no virtual K&C test bench for full-floating cab suspension, and even less K&C test method for full-floating cab suspension, which makes the K&C test method for full-floating cab suspension costly.

[0004] In view of this problem, the present invention provides a virtual K&C test method and system for a commercial vehicle full-floating cab suspension to solve the above problem. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention innovatively proposes a virtual K&C test method and system for a commercial vehicle full-floating cab suspension, which effectively solves the problem of high cost of the virtual K&C test of the commercial vehicle full-floating cab suspension caused by the prior art, and effectively reduces the cost of the virtual K&C test of the commercial vehicle full-floating cab suspension.

[0006] A first aspect of the present invention provides a virtual K&C test method for a commercial vehicle full-floating cab suspension, comprising:

[0007] Build a virtual K&C test bench for commercial vehicle full-floating cab suspension;

[0008] Based on the virtual K&C test bench for commercial vehicle full-floating cab suspension, K&C tests were carried out in sequence;

[0009] According to the test record data, the K characteristic relationship curve or C characteristic relationship curve at the wheel center of the left and right wheels of the front axle and the left and right wheels of the rear axle are generated for each test condition.

[0010] Optionally, the K&C test bench includes an actuating platform, virtual wheels, a virtual front axle, a virtual rear axle, a frame, and a suspended cab, wherein the virtual wheels are respectively arranged on the actuating platform, and the virtual wheels are respectively connected through a virtual front axle, a virtual rear axle, and a frame, and the suspension composed of the virtual front axle, the virtual rear axle, the frame, and the virtual wheels is a non-independent suspension, and the suspended cab is arranged above the virtual front axle, the virtual rear axle, the frame, and the virtual wheels through a damper / spring;

[0011] Furthermore, the construction of a virtual K&C test bench for commercial vehicle full-floating cab suspension specifically includes:

[0012] Export the driving suspension part of the commercial vehicle model separately;

[0013] Delete the Mount parts used to establish connections with the frame, create Generalparts between each frame connection point, and create the frame geometry;

[0014] The frames are set to be fixedly connected, and the frame and the mounting points under the damper / spring are bushing connections;

[0015] Establish the connection between the virtual wheel and the K&C test bench, and select the mounting point at the lower mounting point of the damper / spring to ensure that the suspension simulation effect composed of the virtual front axle, virtual rear axle, frame and virtual wheel is the same as that of the non-independent suspension;

[0016] Go to the Car assembly page, check the CarTruck option in the plugin manager, then create a suspension subsystem and select any as the type; after the subsystem is successfully created, create a new suspension assembly and select __MDI_TASA_TESTRIG dual-axis test bench as the test bench.

[0017] Optionally, the K&C test includes a parallel wheel hop test of the front and rear axles in the same phase, and the parallel wheel hop test of the front and rear axles in the same phase is specifically:

[0018] The test is carried out under no load and full load conditions. When the front and rear axles are in phase, they bounce up / down at the same displacement at the same time. Then, load is applied according to the geometric multiple of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the parallel wheel jump test of the front and rear axles in phase are recorded.

[0019] When the front and rear axles are tested in parallel with the same phase, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the Camber displacement of the wheel center, the Caster displacement of the wheel center, the Toe displacement of the wheel center, and the vertical force of the wheel center;

[0020] The K characteristic relationship curve includes the change curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement with the wheel center vertical displacement.

[0021] Optionally, the K&C test also includes a front and rear axle anti-phase parallel wheel hop test, and the front and rear axle anti-phase parallel wheel hop test is specifically as follows:

[0022] The test is carried out under no load and full load conditions. When the front and rear axles are in opposite phases, they bounce up / down at the same displacement at the same time. Then, load is applied according to the geometric multiple of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the parallel wheel jump test of the front and rear axles in opposite phases are recorded.

[0023] When the front and rear axles are tested in parallel with opposite phases, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the Camber displacement of the wheel center, the Caster displacement of the wheel center, the Toe displacement of the wheel center, and the vertical force of the wheel center.

[0024] The K characteristic relationship curve includes the change curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement with the wheel center vertical displacement.

[0025] Optionally, the K&C test also includes a front and rear axle same-phase reverse wheel hop test, and the front and rear axle same-phase reverse wheel hop test is specifically as follows:

[0026] The test is carried out under no load and full load conditions. When the front and rear axles are in phase, the left wheels of the front and rear axles and the right wheels of the front and rear axles jump in opposite directions by the same value. The load is applied according to the geometric multiple of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the reverse wheel jump test of the front and rear axles in the same phase are recorded.

[0027] When the front and rear axles are tested in the same phase and in opposite directions, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the Camber displacement of the wheel center, the Caster displacement of the wheel center, the Toe displacement of the wheel center, and the vertical force of the wheel center.

[0028] The K characteristic relationship curve includes the change curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement with the wheel center vertical displacement.

[0029] Optionally, the K&C test also includes a front and rear axle longitudinal force test in the same direction, and the front and rear axle longitudinal force test in the same direction is specifically:

[0030] The test is carried out with no load or full load, so that the left and right wheels of the front and rear axles generate the same longitudinal force, increase the longitudinal force from the initial position to the maximum value in the positive direction of the longitudinal force, then return to the initial position, and apply the longitudinal force in the negative direction from the initial position to the maximum value in the negative direction of the longitudinal force, then return to the initial position, while other axles except the front and rear axles remain in a free state, and record the test data corresponding to the longitudinal force test in the same direction of the front and rear axles;

[0031] When the front and rear axles are tested for longitudinal forces in the same direction, the test data include wheel center longitudinal force, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement;

[0032] The C characteristic relationship curve includes the curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement changing with the wheel center longitudinal force.

[0033] Optionally, the K&C test also includes a lateral force test on the front and rear axles in the same direction. The lateral force test on the front and rear axles in the same direction is specifically as follows:

[0034] The test is carried out under empty and full load conditions, so that the left and right wheels of the front and rear axles generate the same lateral force, and the lateral force is increased from the initial position to the maximum value in the positive direction of the lateral force, and then returns to the initial position, and the lateral force is applied in the negative direction from the initial position to the maximum value in the negative direction of the lateral force, and then returns to the initial position. At the same time, other axles except the front and rear axles remain in a free state, and the test data corresponding to the lateral force test in the same direction of the front and rear axles are recorded;

[0035] When the front and rear axles are tested for lateral forces in the same direction, the test data include wheel center lateral force, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement;

[0036] The C characteristic relationship curve includes the curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement changing with the wheel center lateral force.

[0037] Optionally, the K&C test also includes a front and rear axle same-direction self-aligning torque test, and the front and rear axle same-direction self-aligning torque test is specifically as follows:

[0038] The test is carried out with no load or full load, so that the left and right wheels of the front and rear axles generate the same self-aligning torque, increase the self-aligning torque from the initial position to the maximum value of the positive direction of the self-aligning torque, then return to the initial position, and apply the self-aligning torque from the initial position to the negative direction to the maximum value of the positive torque in the negative direction, then return to the initial position, while other axles except the front and rear axles remain in a free state, and record the test data corresponding to the self-aligning torque test of the front and rear axles in the same direction;

[0039] When the front and rear axles are tested for the same-direction self-aligning moment, the test data include the wheel center self-aligning moment, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement;

[0040] The C characteristic relationship curve includes the curves of the wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement changing with the wheel center aligning torque.

[0041] A second aspect of the present invention provides a virtual K&C test system for a commercial vehicle full-floating cab suspension, comprising:

[0042] Build the module to build a virtual K&C test bench for full-floating cab suspension for commercial vehicles;

[0043] The test module conducts K&C tests in sequence based on the virtual K&C test bench for full-floating cab suspension of commercial vehicles built;

[0044] The generation module generates K characteristic relationship curves or C characteristic relationship curves at the wheel centers of the left and right wheels of the front axle and the left and right wheels of the rear axle respectively under each test condition according to the test record data.

[0045] The technical solution adopted by the present invention includes the following technical effects:

[0046] 1. In the technical solution of the present invention, a virtual K&C test bench for a full-floating cab suspension of a commercial vehicle is built; based on the built virtual K&C test bench for a full-floating cab suspension of a commercial vehicle, K&C tests are performed in sequence; according to the test record data, K characteristic relationship curves and C characteristic relationship curves at the wheel centers of the left and right wheels of the front axle and the left and right wheels of the rear axle are generated for each test condition, respectively, effectively solving the problem of high cost of virtual K&C test of full-floating cab suspension of commercial vehicles caused by the prior art, and effectively reducing the cost of virtual K&C test of full-floating cab suspension of commercial vehicles.

[0047] 2. The virtual K&C test bench in the technical solution of the present invention includes an actuating platform, virtual wheels, a virtual front axle, a virtual rear axle, a frame, and a suspended cab. The virtual wheels are respectively arranged on the actuating platform, and the virtual wheels are respectively connected through the virtual front axle, the virtual rear axle, and the frame. The suspension composed of the virtual front axle, the virtual rear axle, the frame, and the virtual wheels is a non-independent suspension. The suspended cab is arranged above the virtual front axle, the virtual rear axle, the frame, and the virtual wheels through a damper / spring; the frames are arranged to be fixedly connected, and the frame and The lower mounting point of the damper / spring is connected by a bushing; the connection between the virtual wheel and the K&C test bench is established, and the mounting points are all selected at the lower mounting points of the damper / spring to ensure that the suspension simulation effect composed of the virtual front axle, virtual rear axle, frame, and virtual wheels is the same as that of the non-independent suspension, which fills the gap in the current research on the K&C test method of full-floating cab suspension at home and abroad, and can provide an important reference for the research and development of the K&C physical test bench for cab suspension, and can also provide a research basis and simulation test conditions for the research on the performance evaluation of the cab suspension system.

[0048] 3. In the K&C test, the technical solution of the present invention can express the influence of the frame on the movement of the full-floating cab by setting the wheel hop conditions of the front and rear axles in opposite phases and in the same direction; can express the influence of the virtual front and rear axles and anti-roll bars on the movement of the full-floating cab by setting the wheel hop conditions of the front and rear axles in the same phase and in the opposite direction; can express the influence of the elastic element and the guide mechanism on the vertical movement by setting the wheel hop conditions of the front and rear axles in the same phase and in the same direction, so that the virtual K&C test of the full-floating cab suspension of commercial vehicles is more comprehensive, and has strong practicality and operability.

[0049] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 This is a schematic diagram of a process of a method in Example 1 of the present invention;

[0052] Figure 2 Schematic diagram of a virtual K&C test bench for cab suspension built based on Adams / Car in the method of Example 1 of the solution of the present invention;

[0053] Figure 3 This is a schematic diagram of the process of the K&C test in the method of Example 1 of the present invention;

[0054] Figure 4 It is a schematic diagram of a real K&C test bench for cab suspension in the method of Example 1 of the solution of the present invention;

[0055] Figure 5 It is a schematic diagram of the structure of the system of Example 2 in the solution of the present invention. DETAILED DESCRIPTION

[0056] In order to clearly illustrate the technical features of the present solution, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings. The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. In addition, the present invention may repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. It should be noted that the components illustrated in the accompanying drawings are not necessarily generated to scale. The present invention omits the description of known components and processing techniques and processes to avoid unnecessary limitations on the present invention.

[0057] Embodiment 1

[0058] like Figure 1 As shown, the present invention provides a virtual K&C test method for a commercial vehicle full-floating cab suspension, comprising:

[0059] S1, build a virtual K&C test bench for commercial vehicle full-floating cab suspension;

[0060] S2, based on the virtual K&C test bench for commercial vehicle full-floating cab suspension, conduct K&C tests in sequence;

[0061] S3, generating a K characteristic relationship curve or a C characteristic relationship curve at the wheel centers of the left and right wheels of the front axle and the left and right wheels of the rear axle for each test condition according to the test record data.

[0062] Among them, in step S1, considering the lack of physical test benches in China, the present invention builds a "virtual K&C test bench" based on Adams / Car to explain the K&C test method. The virtual K&C test bench is as follows: Figure 2 shown.

[0063] The virtual K&C test bench includes an actuating platform, virtual wheels, a virtual front axle, a virtual rear axle, a frame, and a suspended cab. The virtual wheels are respectively arranged on the actuating platform, and the virtual wheels are respectively connected through the virtual front axle, the virtual rear axle, and the frame. The suspension composed of the virtual front axle, the virtual rear axle, the frame, and the virtual wheels is a non-independent suspension, and the suspended cab is arranged above the virtual front axle, the virtual rear axle, the frame, and the virtual wheels through a damper / spring.

[0064] Specifically, the construction of a virtual K&C test bench for commercial vehicle full-floating cab suspension based on Adams / car (automotive simulation software module) includes:

[0065] Export the driving suspension part of the commercial vehicle model separately; open the Templatebuilder interface of Adams / car;

[0066] Delete the Mountparts used to establish a connection with the frame, create General parts (general parts or original parts) between each frame connection point, and create the frame geometry based on the frame connection points;

[0067] In the constraint part, the frames are set to be fixedly connected, and the frame and the mounting point under the damper / spring are connected by bushings;

[0068] Establish the connection between the virtual wheel and the K&C test bench, and the installation points are all selected at the lower installation points of the damper / spring to ensure that the suspension simulation effect composed of the virtual front axle, virtual rear axle, frame, and virtual wheel is the same or similar to that of the non-independent suspension;

[0069] Go to the Car assembly page, check the CarTruck option in the plugin manager, then create a suspension subsystem and select any as the type; after the subsystem is successfully created, create a new suspension assembly and select __MDI_TASA_TESTRIG dual-axis test bench as the test bench.

[0070] Among them, in step S2, if Figure 3 As shown in the figure, the K&C test includes the parallel wheel hop test of the front and rear axles in the same phase. The parallel wheel hop test of the front and rear axles in the same phase is specifically as follows:

[0071] The test is carried out under no load and full load conditions. When the front and rear axles are in phase, they bounce up / down at the same displacement at the same time. Then, load is applied according to the geometric multiple (e.g. 2.5 times) of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the parallel wheel jump test of the front and rear axles in phase are recorded.

[0072] Among them, empty and full load specifically refer to testing under empty load and full load conditions respectively.

[0073] When the front and rear axles are tested in parallel with the same phase, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the displacement of the wheel center Camber (positive camber angle of the tire), the displacement of the wheel center Caster (positive camber distance of the kingpin), the displacement of the wheel center Toe (toe angle), and the vertical force of the wheel center.

[0074] The K characteristic relationship curve includes the curves of wheel center longitudinal displacement (ΔX), wheel center lateral displacement (ΔY), wheel center Camber displacement (ΔCamber), wheel center Caster displacement (ΔCaster), and wheel center Toe displacement (ΔToe) respectively with the change of wheel center vertical displacement. That is, ΔX-Δz p (K characteristic test); ΔY-Δz p (K characteristic test); ΔCamber-Δz p (K characteristic test); ΔCaster-Δz p (K characteristic test); ΔToe-Δz p (K characteristic test). The curve corresponding to the vertical force of the wheel center is F z -Δz p (Suspension vertical stiffness test). The specific test data collection is shown in Table 1 below:

[0075] Table 1: Front and rear axle parallel wheel hop test plan

[0076]

[0077]

[0078] In step S2, if Figure 3 As shown, the K&C test also includes a front and rear axle anti-phase parallel wheel hop test, and the front and rear axle anti-phase parallel wheel hop test is specifically as follows:

[0079] The test is carried out under no load and full load conditions. When the front and rear axles are in opposite phases, they bounce up / down at the same displacement at the same time. Then, load is applied according to the geometric multiple of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the parallel wheel jump test of the front and rear axles in opposite phases are recorded.

[0080] When the front and rear axles are tested in parallel with opposite phases, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the Camber displacement of the wheel center, the Caster displacement of the wheel center, the Toe displacement of the wheel center, and the vertical force of the wheel center.

[0081] The K characteristic relationship curve includes the curves of wheel center longitudinal displacement (ΔX), wheel center lateral displacement (ΔY), wheel center Camber displacement (ΔCamber), wheel center Caster displacement (ΔCaster), and wheel center Toe displacement (ΔToe) respectively with the change of wheel center vertical displacement. That is, ΔX-Δz p (K characteristic test); ΔY-Δz p (K characteristic test); ΔCamber-Δz p (K characteristic test); ΔCaster-Δz p (K characteristic test); ΔToe-Δz p(K characteristic test). The curve corresponding to the vertical force of the wheel center is F z -Δz p (Suspension vertical stiffness test).

[0082] The specific test data collection is shown in Table 2 below:

[0083] Table 2: Front and rear axle anti-phase parallel wheel hop test plan

[0084]

[0085]

[0086] like Figure 3 As shown in the figure, the K&C test also includes the front and rear axle same-phase reverse wheel hop test, and the front and rear axle same-phase reverse wheel hop test is specifically as follows:

[0087] The test is carried out under no load and full load conditions. When the front and rear axles are in phase, the left wheels of the front and rear axles and the right wheels of the front and rear axles jump in opposite directions by the same value. The load is applied according to the geometric multiple of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the reverse wheel jump test of the front and rear axles in the same phase are recorded.

[0088] When the front and rear axles are tested in the same phase and in opposite directions, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the Camber displacement of the wheel center, the Caster displacement of the wheel center, the Toe displacement of the wheel center, and the vertical force of the wheel center.

[0089] The K characteristic relationship curve includes the change curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement with the wheel center vertical displacement.

[0090] The K characteristic relationship curve includes the curves of wheel center longitudinal displacement (ΔX), wheel center lateral displacement (ΔY), wheel center Camber displacement (ΔCamber), wheel center Caster displacement (ΔCaster), and wheel center Toe displacement (ΔToe) respectively with the change of wheel center vertical displacement. That is, ΔX-Δz p (K characteristic test); ΔY-Δz p (K characteristic test); ΔCamber-Δz p (K characteristic test); ΔCaster-Δz p (K characteristic test); ΔToe-Δz p (K characteristic test). The curve corresponding to the vertical force of the wheel center is F z -Δz p (Suspension vertical stiffness test).

[0091] The specific test data collection is shown in Table 3 below:

[0092] Table 3: Front and rear axle reverse phase reverse wheel hop test plan

[0093]

[0094]

[0095] like Figure 3 As shown, the K&C test also includes the front and rear axle longitudinal force test in the same direction. The front and rear axle longitudinal force test in the same direction is as follows:

[0096] The test is carried out under empty and full load conditions, so that the left and right wheels of the front and rear axles generate the same longitudinal force, and the longitudinal force is increased from the initial position to the maximum value of the longitudinal force in the positive direction (it can be applied at 0.7 times the load on the virtual wheel under static load or the design load), and then returns to the initial position, and the longitudinal force is applied in the negative direction from the initial position to the maximum value of the longitudinal force in the negative direction (determined according to the specific conditions of the suspension, the maximum value of the longitudinal force in the negative direction is generally 80% of the initial load, that is, 80% of the maximum value of the longitudinal force in the positive direction), and then returns to the initial position, while the other axles except the front and rear axles remain in a free state, and the test data corresponding to the same-direction longitudinal force test of the front and rear axles are recorded;

[0097] When the front and rear axles are tested for longitudinal forces in the same direction, the test data include wheel center longitudinal force, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement;

[0098] The C characteristic relationship curve includes the wheel center longitudinal displacement (ΔX), wheel center lateral displacement (ΔY), wheel center Camber displacement (ΔCamber), wheel center Caster displacement (ΔCaster), wheel center Toe displacement (ΔToe) with the wheel center longitudinal force (F x )’s change curve.

[0099] That is, ΔX-F x (C characteristic test); ΔY-F x (C characteristic test); ΔCamber-F x (C characteristic test); ΔCaster-F x (C characteristic test); ΔToe-F x (C characteristic test).

[0100] The specific test data collection is shown in Table 4 below:

[0101] Table 4: Front and rear axle longitudinal force test plan in the same direction

[0102]

[0103] like Figure 3As shown in the figure, the K&C test also includes the front and rear axle lateral force test in the same direction. The front and rear axle lateral force test in the same direction is as follows:

[0104] The test is carried out under empty and full load conditions, so that the left and right wheels of the front and rear axles generate the same lateral force, and the lateral force is increased from the initial position to the maximum value of the lateral force in the positive direction (it can be applied at 0.7 times the load on the virtual wheel under static load or the design load), and then returns to the initial position, and applies lateral force in the negative direction from the initial position to the maximum value of the lateral force in the negative direction (determined according to the specific conditions of the suspension, the maximum value of the lateral force in the negative direction is generally 80% of the initial load, that is, 80% of the maximum value of the lateral force in the positive direction), and then returns to the initial position, while the other axles except the front and rear axles remain in a free state, and the test data corresponding to the lateral force test in the same direction of the front and rear axles are recorded;

[0105] When the front and rear axles are tested for lateral forces in the same direction, the test data include wheel center lateral force, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement;

[0106] The C characteristic relationship curve includes the wheel center longitudinal displacement (ΔX), wheel center lateral displacement (ΔY), wheel center Camber displacement (ΔCamber), wheel center Caster displacement (ΔCaster), wheel center Toe displacement (ΔToe) with the wheel center longitudinal force (F x )’s change curve.

[0107] That is, ΔX-F x (C characteristic test); ΔY-F x (C characteristic test); ΔCamber-F x (C characteristic test); ΔCaster-F x (C characteristic test); ΔToe-F x (C characteristic test).

[0108] The specific test data collection is shown in Table 5 below:

[0109] Table 5: Test plan for lateral force in the same direction for front and rear axles

[0110]

[0111]

[0112] like Figure 3 As shown, the K&C test also includes the front and rear axle same-direction return torque test, and the front and rear axle same-direction return torque test is specifically as follows:

[0113] The test is carried out under empty and full load conditions, so that the left and right wheels of the front and rear axles generate the same self-aligning torque, and the self-aligning torque is increased from the initial position to the maximum value of the self-aligning torque in the positive direction (it can be applied at 0.7 times the load on the virtual wheel under static load or the design load), and then return to the initial position, and apply lateral force in the negative direction from the initial position to the maximum value of the lateral force in the negative direction (determined according to the specific conditions of the suspension, the maximum value of the lateral force in the negative direction is generally 80% of the initial load, that is, 80% of the maximum value of the lateral force in the positive direction), and then return to the initial position, while the other axles except the front and rear axles remain in a free state, and record the test data corresponding to the self-aligning torque test of the front and rear axles in the same direction;

[0114] When the front and rear axles are tested for the same-direction self-aligning moment, the test data include the wheel center self-aligning moment, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement;

[0115] The C characteristic relationship curve includes the wheel center longitudinal displacement (ΔX), wheel center lateral displacement (ΔY), wheel center Camber displacement (ΔCamber), wheel center Caster displacement (ΔCaster), wheel center Toe displacement (ΔToe) with the wheel center longitudinal force (F x )’s change curve.

[0116] That is, ΔX-F x (C characteristic test); ΔY-F x (C characteristic test); ΔCamber-F x (C characteristic test); ΔCaster-F x (C characteristic test); ΔToe-F x (C characteristic test).

[0117] The specific test data collection is shown in Table 6 below:

[0118] Table 6: Test plan for the same-direction return torque of the front and rear axles

[0119]

[0120]

[0121] If you need to build a cab suspension K&C test bench later, you can Figure 4 As shown, Figure 2 The virtual wheels in the figure are removed, and the cab suspension and frame are directly placed on the actuating platform. The measured data content remains basically unchanged. The only variable is the conversion of the wheel alignment angle (ΔCamber, ΔCaster, ΔToe) into the three-way Euler angle (ΔPhy, ΔTheta, ΔPsi) at the connection point between the cab suspension and the frame.

[0122] If it has Figure 4 For the physical K&C test bench of the cab suspension shown in the figure, the "wheel Camber displacement" in Tables 1 to 6 can be replaced by "roll Phy displacement of the cab suspension and frame connection point"; the "wheel Caster displacement" in Tables 1 to 6 can be replaced by "pitch Theta displacement of the cab suspension and frame connection point"; the "wheel Toe displacement" in Tables 1 to 6 can be replaced by "yaw Psi displacement of the cab suspension and frame connection point". The other working conditions remain unchanged, and the K&C test can be carried out according to the test schemes in Tables 1 to 6.

[0123] In the technical solution of the present invention, a virtual K&C test bench for a full-floating cab suspension of a commercial vehicle is built; based on the built virtual K&C test bench for a full-floating cab suspension of a commercial vehicle, K&C tests are performed in sequence; according to the test record data, K characteristic relationship curves and C characteristic relationship curves at the wheel centers of the left and right wheels of the front axle and the left and right wheels of the rear axle are generated for each test condition, respectively, effectively solving the problem of high cost of virtual K&C test of full-floating cab suspension of commercial vehicles caused by the prior art, and effectively reducing the cost of virtual K&C test of full-floating cab suspension of commercial vehicles.

[0124] In the technical solution of the present invention, the virtual K&C test bench includes an actuating platform, virtual wheels, a virtual front axle, a virtual rear axle, a frame, and a suspended cab. The virtual wheels are respectively arranged on the actuating platform, and the virtual wheels are respectively connected through the virtual front axle, the virtual rear axle, and the frame. The suspension composed of the virtual front axle, the virtual rear axle, the frame, and the virtual wheels is a non-independent suspension. The suspended cab is arranged above the virtual front axle, the virtual rear axle, the frame, and the virtual wheels through a damper / spring; the frames are arranged to be fixedly connected, and the mounting points under the frame and the damper / spring are bushing connections; the connection between the virtual wheels and the K&C test bench is established, and the mounting points are all selected at the lower mounting points of the damper / spring to ensure that the suspension simulation effect composed of the virtual front axle, the virtual rear axle, the frame, and the virtual wheels is the same as that of the non-independent suspension, which can provide an important reference for the research and development of the cab suspension K&C physical test bench, and can also provide a research basis and simulation test conditions for the research on the performance evaluation of the cab suspension system.

[0125] In the K&C test, the technical solution of the present invention can express the influence of the vehicle frame on the movement of the full-floating cab by setting the wheel hop conditions of the front and rear axles in opposite phases and in the same direction; can express the influence of the virtual front and rear axles and anti-roll bars on the movement of the full-floating cab by setting the wheel hop conditions of the front and rear axles in the same phase and in the opposite direction; can express the influence of the elastic element and the guide mechanism on the vertical movement by setting the wheel hop conditions of the front and rear axles in the same phase and in the same direction, so that the virtual K&C test of the full-floating cab suspension of commercial vehicles is more comprehensive, and has strong practicality and operability.

[0126] Embodiment 2

[0127] like Figure 5 As shown, the technical solution of the present invention also provides a virtual K&C test system for a commercial vehicle full-floating cab suspension, comprising:

[0128] Build Module 101 to build a virtual K&C test bench for commercial vehicle full-floating cab suspension;

[0129] Test module 102, based on the constructed virtual K&C test bench for full-floating cab suspension of commercial vehicles, K&C tests are performed in sequence;

[0130] The generating module 103 generates the K characteristic relationship curve or the C characteristic relationship curve at the wheel center of the left and right wheels of the front axle and the left and right wheels of the rear axle respectively under each test condition according to the test record data.

[0131] It should be noted that the construction module 101, the test module 102, and the generation module 103 in the embodiment of the present invention correspond to the method steps in the first embodiment, and are not described in detail in this embodiment.

[0132] In the technical solution of the present invention, a virtual K&C test bench for a full-floating cab suspension of a commercial vehicle is built; based on the built virtual K&C test bench for a full-floating cab suspension of a commercial vehicle, K&C tests are performed in sequence; according to the test record data, K characteristic relationship curves and C characteristic relationship curves at the wheel centers of the left and right wheels of the front axle and the left and right wheels of the rear axle are generated for each test condition, respectively, effectively solving the problem of high cost of virtual K&C test of full-floating cab suspension of commercial vehicles caused by the prior art, and effectively reducing the cost of virtual K&C test of full-floating cab suspension of commercial vehicles.

[0133] In the technical solution of the present invention, the virtual K&C test bench includes an actuating platform, virtual wheels, a virtual front axle, a virtual rear axle, a frame, and a suspended cab. The virtual wheels are respectively arranged on the actuating platform, and the virtual wheels are respectively connected through the virtual front axle, the virtual rear axle, and the frame. The suspension composed of the virtual front axle, the virtual rear axle, the frame, and the virtual wheels is a non-independent suspension. The suspended cab is arranged above the virtual front axle, the virtual rear axle, the frame, and the virtual wheels through a damper / spring; the frames are arranged to be fixedly connected, and the mounting points under the frame and the damper / spring are bushing connections; the connection between the virtual wheels and the K&C test bench is established, and the mounting points are all selected at the lower mounting points of the damper / spring to ensure that the suspension simulation effect composed of the virtual front axle, the virtual rear axle, the frame, and the virtual wheels is the same as that of the non-independent suspension, which can provide an important reference for the research and development of the cab suspension K&C physical test bench, and can also provide a research basis and simulation test conditions for the research on the performance evaluation of the cab suspension system.

[0134] In the K&C test, the technical solution of the present invention can express the influence of the vehicle frame on the movement of the full-floating cab by setting the wheel hop conditions of the front and rear axles in opposite phases and in the same direction; can express the influence of the virtual front and rear axles and anti-roll bars on the movement of the full-floating cab by setting the wheel hop conditions of the front and rear axles in the same phase and in the opposite direction; can express the influence of the elastic element and the guide mechanism on the vertical movement by setting the wheel hop conditions of the front and rear axles in the same phase and in the same direction, so that the virtual K&C test of the full-floating cab suspension of commercial vehicles is more comprehensive, and has strong practicality and operability.

[0135] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A virtual K&C test method for a commercial vehicle full-floating cab suspension, comprising: Build a virtual K&C test bench for commercial vehicle full-floating cab suspension; Based on the virtual K&C test bench for commercial vehicle full-floating cab suspension, K&C tests are carried out in sequence; According to the test record data, the K characteristic relationship curve or C characteristic relationship curve at the wheel center of the left and right wheels of the front axle and the left and right wheels of the rear axle are generated for each test condition.

2. A virtual K&C test method for a commercial vehicle full-floating cab suspension according to claim 1, characterized in that: The virtual K&C test bench includes an actuating platform, virtual wheels, a virtual front axle, a virtual rear axle, a frame, and a suspended cab. The virtual wheels are respectively arranged on the actuating platform, and the virtual wheels are respectively connected through the virtual front axle, the virtual rear axle, and the frame. The suspension composed of the virtual front axle, the virtual rear axle, the frame, and the virtual wheels is a non-independent suspension, and the suspended cab is arranged above the virtual front axle, the virtual rear axle, the frame, and the virtual wheels through a damper / spring.

3. A virtual K&C test method for a commercial vehicle full-floating cab suspension according to claim 2, characterized in that: The construction of a virtual K&C test bench for commercial vehicle full-floating cab suspension includes: Export the driving suspension part of the commercial vehicle model separately; Delete the Mount parts used to establish connections with the frame, create Generalparts between each frame connection point, and create the frame geometry; The frames are set to be fixedly connected, and the frame and the mounting points under the damper / spring are bushing connections; Establish the connection between the virtual wheel and the K&C test bench, and select the mounting point at the lower mounting point of the damper / spring to ensure that the suspension simulation effect composed of the virtual front axle, virtual rear axle, frame and virtual wheel is the same as that of the non-independent suspension; Go to the Car assembly page, check the CarTruck option in the plugin manager, then create a suspension subsystem and select any as the type; after the subsystem is successfully created, create a new suspension assembly and select __MDI_TASA_TESTRIG dual-axis test bench as the test bench.

4. A virtual K&C test method for a commercial vehicle full-floating cab suspension according to claim 1, characterized in that: The K&C test includes the parallel wheel hop test of the front and rear axles in the same phase. The parallel wheel hop test of the front and rear axles in the same phase is as follows: The test is carried out under no load and full load conditions. When the front and rear axles are in phase, they bounce up / down at the same displacement at the same time. Then, load is applied according to the geometric multiple of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the parallel wheel jump test of the front and rear axles in phase are recorded. When the front and rear axles are tested in parallel with the same phase, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the Camber displacement of the wheel center, the Caster displacement of the wheel center, the Toe displacement of the wheel center, and the vertical force of the wheel center; The K characteristic relationship curve includes the change curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement with the wheel center vertical displacement.

5. A virtual K&C test method for a commercial vehicle full-floating cab suspension according to claim 1, characterized in that: The K&C test also includes the front and rear axle anti-phase parallel wheel hop test, which is as follows: The test is carried out under no load and full load conditions. When the front and rear axles are in opposite phases, they bounce up / down at the same displacement at the same time. Then, load is applied according to the geometric multiple of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the parallel wheel jump test of the front and rear axles in opposite phases are recorded. When the front and rear axles are tested in parallel with opposite phases, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the Camber displacement of the wheel center, the Caster displacement of the wheel center, the Toe displacement of the wheel center, and the vertical force of the wheel center. The K characteristic relationship curve includes the change curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement with the wheel center vertical displacement.

6. A virtual K&C test method for a commercial vehicle full-floating cab suspension according to claim 1, characterized in that: The K&C test also includes the front and rear axle same-phase reverse wheel hop test, which is as follows: The test is carried out under no load and full load conditions. When the front and rear axles are in phase, the left wheels of the front and rear axles and the right wheels of the front and rear axles jump in opposite directions by the same value. The load is applied according to the geometric multiple of the load on the virtual wheel under no load or the design load or the maximum stroke. The test data corresponding to the reverse wheel jump test of the front and rear axles in the same phase are recorded. When the front and rear axles are tested in the same phase and in opposite directions, the test data include the vertical displacement of the wheel center, the longitudinal displacement of the wheel center, the lateral displacement of the wheel center, the Camber displacement of the wheel center, the Caster displacement of the wheel center, the Toe displacement of the wheel center, and the vertical force of the wheel center. The K characteristic relationship curve includes the change curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement with the wheel center vertical displacement.

7. A virtual K&C test method for a commercial vehicle full-floating cab suspension according to claim 1, characterized in that: The K&C test also includes the front and rear axle longitudinal force test in the same direction. The front and rear axle longitudinal force test in the same direction is as follows: The test is carried out with no load or full load, so that the left and right wheels of the front and rear axles generate the same longitudinal force, increase the longitudinal force from the initial position to the maximum value in the positive direction of the longitudinal force, then return to the initial position, and apply the longitudinal force in the negative direction from the initial position to the maximum value in the negative direction of the longitudinal force, then return to the initial position, while other axles except the front and rear axles remain in a free state, and record the test data corresponding to the longitudinal force test in the same direction of the front and rear axles; When the front and rear axles are tested for longitudinal forces in the same direction, the test data include wheel center longitudinal force, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement; The C characteristic relationship curve includes the curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement changing with the wheel center longitudinal force.

8. A virtual K&C test method for a commercial vehicle full-floating cab suspension according to claim 1, characterized in that: The K&C test also includes the front and rear axle lateral force test in the same direction. The front and rear axle lateral force test in the same direction is as follows: The test is carried out under empty and full load conditions, so that the left and right wheels of the front and rear axles generate the same lateral force, and the lateral force is increased from the initial position to the maximum value in the positive direction of the lateral force, and then returns to the initial position, and the lateral force is applied in the negative direction from the initial position to the maximum value in the negative direction of the lateral force, and then returns to the initial position. At the same time, other axles except the front and rear axles remain in a free state, and the test data corresponding to the lateral force test in the same direction of the front and rear axles are recorded; When the front and rear axles are tested for lateral forces in the same direction, the test data include wheel center lateral force, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement; The C characteristic relationship curve includes the curves of wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement changing with the wheel center lateral force.

9. A virtual K&C test method for a commercial vehicle full-floating cab suspension according to claim 1, characterized in that: The K&C test also includes the front and rear axle same-direction return torque test, which is as follows: The test is carried out with no load or full load, so that the left and right wheels of the front and rear axles generate the same self-aligning torque, and the self-aligning torque is increased from the initial position to the maximum value of the self-aligning torque in the positive direction, and then returns to the initial position, and the self-aligning torque is applied from the initial position to the negative direction to the maximum value of the self-aligning torque in the negative direction, and then returns to the initial position. At the same time, other axles except the front and rear axles remain in a free state, and the test data corresponding to the self-aligning torque test of the front and rear axles in the same direction are recorded; When the front and rear axles are tested for the same-direction self-aligning moment, the test data include the wheel center self-aligning moment, wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement, and wheel center Toe displacement; The C characteristic relationship curve includes the curves of the wheel center longitudinal displacement, wheel center lateral displacement, wheel center Camber displacement, wheel center Caster displacement and wheel center Toe displacement changing with the wheel center aligning torque.

10. A virtual K&C test system for full-floating cab suspension of commercial vehicles, characterized by comprising: Build the module to build a virtual K&C test bench for full-floating cab suspension for commercial vehicles; The test module conducts K&C tests in sequence based on the virtual K&C test bench for full-floating cab suspension of commercial vehicles built; The generation module generates K characteristic relationship curves or C characteristic relationship curves at the wheel centers of the left and right wheels of the front axle and the left and right wheels of the rear axle respectively under each test condition according to the test record data.

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