A vehicle reliability verification method for suspension limit

Abstract

The present invention relates to a method for verifying the reliability of a vehicle with suspension limit, which comprises the following steps: S1. Prepare a plurality of suspension samples according to the design parameters of the suspension; S2. Assemble the normal suspension onto the vehicle and conduct the reliability verification of the suspension limit according to the test conditions. If the verification result is qualified, execute S3, otherwise the test result is unqualified; S3. Replace one normal suspension on the vehicle with a failed suspension and conduct the reliability verification of the suspension limit again. If the verification result is qualified, execute S4, otherwise the test result is unqualified; S4. Repeat S3, and successively replace the normal suspension with the failed suspension to conduct the reliability verification of the suspension limit until all suspensions are replaced by the failed suspensions. If all test results are qualified, the reliability verification of the suspension limit passes; otherwise, after optimizing the design parameters of the suspension, return to S1. The method of the present invention can timely discover the potential safety problems of the vehicle in the case of suspension failure during the design stage, so as to optimize the vehicle structure and improve the vehicle safety.

Description

Technical Field

[0001] The present invention relates to the technical field of suspension limit reliability testing, and particularly relates to a method for verifying the reliability of a vehicle with suspension limits. Background Art

[0002] With the development of the automotive industry, more and more functions are added to automobiles. As a result, on the one hand, the powertrain of automobiles becomes more and more complex, and more and more components are assembled onto the powertrain, making the volume of the powertrain larger and larger; on the other hand, more components are arranged in the engine compartment, making the space in the engine compartment smaller and smaller. The suspension system is used to connect the powertrain to the body / frame. Through the limiting function of the suspension system, the powertrain is fixed in the engine compartment to ensure that the powertrain and other components assembled on the powertrain move within the allowable range, and to prevent it from colliding with other parts in the engine compartment / body and causing damage.

[0003] Currently, for the verification of suspensions in the industry, whether it is bench verification or vehicle verification, it is carried out when the suspension meets the design requirements. Due to the importance of suspension limits (after the suspension limit fails, the powertrain will exceed the designed movement range, resulting in collisions between the powertrain and the accessories fixed on it and other components in the engine compartment or in the engine compartment, causing damage to them, and thus resulting in safety-related function failures (for example, damaging the brake oil pipe / steering pipe structure affects braking and steering)) and the particularity of the suspension structure (the main and passive end brackets are vulcanized and bonded together by the main spring. Since it is impossible to 100% detect whether the vulcanization effect meets the requirements after vulcanization, it is impossible to avoid assembling suspensions with non-compliant vulcanization bonding onto the vehicle. Once this happens and the vehicle has not been verified for the failure of the main spring bonding, the consequences will be uncontrollable, bringing unpredictable losses to both customers and enterprises), there are great risks in only verifying the reliability of suspensions in the design state. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and propose a method for verifying the reliability of a vehicle with suspension limits, so as to verify whether the suspension limit can still ensure that it does not collide with the surrounding components in the engine compartment and cause safety function failures after the main spring of the suspension fails.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A method for verifying the reliability of a vehicle with suspension limits includes the following steps:

[0007] S1. Prepare a plurality of target suspension samples according to the design parameters of the target suspension, divide them into two groups, one group is untreated as a normal suspension, and the other group is treated as a failed suspension;

[0008] S2. First, install the normal mounts onto the vehicle, and verify the reliability of the mount limit under the pre-designed test conditions. If the verification result is qualified, proceed to step S3; otherwise, output that the reliability test result of the mount limit for the vehicle is unqualified.

[0009] S3. Select one of the failed mounts in S1 to replace a normal mount on the vehicle, and conduct the reliability verification of the mount limit again. If the verification result is qualified, proceed to step S4; otherwise, output that the reliability test result of the mount limit for the vehicle is unqualified.

[0010] S4. Repeat step S3, and successively use the prepared failed mounts to replace the normal mounts on the vehicle for the reliability verification of the mount limit until all the mounts on the vehicle are replaced by the failed mounts. If both the replacement process and the reliability test result of the mount limit after being completely replaced by the failed mounts are qualified, then the reliability verification of the mount limit for the vehicle passes; otherwise, output that the reliability test result of the mount limit for the vehicle is unqualified, and after optimizing the design parameters of the target mount, re-execute step S1.

[0011] Specifically, the normal mounts described in S1 are produced by normal gluing and vulcanization processes, and the failed mounts are produced by directly vulcanizing without gluing or by artificially cutting the main spring of the mount after normal gluing and vulcanization processes.

[0012] Specifically, for the reliability verification of the mount limit under the pre-designed test conditions in S2, the test conditions are designed according to the relevant test standards for mounts.

[0013] Specifically, the standard for the qualified reliability verification result of the mount limit in S2 is that after the test, upon inspection, the target mount has no safety-related functional failures and there is no collision between the power assembly and the surrounding components in the engine compartment.

[0014] Specifically, when selecting one of the failed mounts to replace a normal mount on the vehicle in S3, glue can be applied to the cut of the failed mount to make a slight connection at the cut for easy assembly.

[0015] Advantages of the present invention compared with the prior art:

[0016] Compared with the existing reliability tests for mount limits, the method of the present invention adds a reliability test when the main spring of the mount fails to verify whether the limit function of the mount can still limit the power assembly within the allowable range of movement after the main spring of the mount fails, so that the power assembly does not collide with the surrounding components in the engine compartment. Using the method of the present invention to verify the vehicle mount limit system can timely discover potential safety problems that may occur when the mounts of the vehicle fail during the design stage, thereby optimizing the vehicle structure to improve vehicle safety. Description of the Drawings

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a flowchart of a method for verifying the reliability of a vehicle with a suspension limit. Specific embodiments

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] Embodiment: Refer to Figure 1 。

[0021] As Figure 1 shown, a method for verifying the reliability of a vehicle with a suspension limit includes the following steps:

[0022] S1. Prepare a plurality of target suspension samples according to the design parameters of the target suspension, divide them into two groups, one group is untreated as a normal suspension, and the other group is treated as a failed suspension;

[0023] S2. First, assemble the normal suspension onto the vehicle, and perform the reliability verification of the suspension limit under the pre-designed test conditions. If the verification result is qualified, execute step S3; otherwise, output that the reliability test result of the vehicle with the suspension limit is unqualified.

[0024] S3. Select one of the failed suspensions in S1 to replace a normal suspension on the vehicle, and perform the reliability verification of the suspension limit again. If the verification result is qualified, execute step S4; otherwise, output that the reliability test result of the vehicle with the suspension limit is unqualified.

[0025] S4. Repeat step S3, and successively use the prepared failed suspensions to replace the normal suspensions on the vehicle for the reliability verification of the suspension limit until all the suspensions on the vehicle are replaced by the failed suspensions. If the replacement process and the reliability test result of the suspension limit after complete replacement with the failed suspensions are both qualified, the reliability verification of the vehicle with the suspension limit passes; otherwise, output that the reliability test result of the vehicle with the suspension limit is unqualified, and after optimizing the design parameters of the target suspension, re-execute step S1.

[0026] Specifically, the normal mounts described in S1 are produced by normal gluing and vulcanization processes. The failed mounts are produced by directly performing the vulcanization process without gluing or obtained by artificially cutting the main spring of the mount after normal gluing and vulcanization processes.

[0027] Specifically, the reliability verification of the mount limit is carried out under the pre-designed test conditions described in S2, and the test conditions are designed according to the relevant test standards for mounts.

[0028] Specifically, the standard for passing the reliability verification of the mount limit described in S2 is that after the test, upon inspection, the target mount has no safety-related functional failures and there is no collision between the powertrain and the surrounding components of the engine compartment.

[0029] Specifically, in S3, select a failed mount to replace a normal mount on the vehicle. The failed mount can be smeared with glue at the cut to make a slight connection at the cut for easy assembly.

[0030] The method of the present invention will be further described below through the process of the limit reliability test of a three-point mount.

[0031] ① Sample preparation: After the other performances of the mounts are verified and the mount structure of the vehicle is determined, prepare the mount samples for the test: a set of normal mounts and a set of failed mounts with the main spring completely cut.

[0032] ② Preparation before the test: Confirm the minimum distance between the powertrain and the steering and braking systems.

[0033] ③ Test process:

[0034] The first round: First, confirm that the vehicle condition is normal, check the minimum distance points between the powertrain and the steering and braking systems confirmed during the preparation before the experiment, and verify according to the test conditions listed in Table 1 below.

[0035] Table 1 Test condition table for the limit reliability test of the vehicle mounts

[0036]

[0037] The first-round test:

[0038] Enter condition 1 (high-speed loop), drive one lap (1 cycle) at a speed of 70 - 90 km / h and then drive out;

[0039] Enter conditions 2 - 6 in sequence at 40 km / h, complete 1 cycle and then perform the second cycle according to conditions 2 - 6 (a total of 2 cycles);

[0040] After completing the second cycle of conditions 2 - 6, enter condition 7 (high-speed loop), drive one lap (1 cycle) at a speed of 105 - 120 km / h and then drive out;

[0041] Enter working condition 8 (F1 vibration road 3) at 40 km / h, enter working condition 9 at 30 km / h, enter working condition 10 at 40 km / h and drive for 1 cycle, then perform the cycle of working conditions 8 - 10 again;

[0042] For working condition 11, enter the straight section of F2 side road, accelerate from standstill to 40 km / h at full throttle, then perform emergency braking to stop with an acceleration of 0.7g, and repeat 3 times.

[0043] For working condition 12, drive to the figure - eight square, after parking, shift to D gear (for automatic - transmission vehicles), while stepping on the brake pedal, quickly step on the accelerator to 2500 - 3000 r / min, release the accelerator, then release the brake and re - park, and repeat the operation of this working condition 3 times;

[0044] For working condition 13, drive around the figure - eight square. When the surrounding is safe, shift to D gear and release the accelerator to coast (at a speed of 10 km / h), turn the steering wheel 360° at the fastest speed, then release it, and observe whether the steering wheel automatically returns to the straight position, and repeat 3 times (360° to the left and right each time is counted as 1 time);

[0045] For working condition 14, shift to P gear and park. Turn the steering wheel to the extreme positions to the left and right, and repeat 3 times;

[0046] For working condition 15, enter the high - speed loop, drive at a speed of 90 km / h, and perform 3 rapid lane changes;

[0047] For working condition 16, enter a 16.6% slope, brake and stop in the middle of the slope, shift to N gear, pull the handbrake, and park for 10 - 15 s to check the braking effect;

[0048] For working condition 17, after exiting the 16.6% slope, turn right, drive down through the connecting road on the right, go up a 20% slope to the top of the mountain, drive down a 30% slope, brake and stop in the middle of the slope, shift to N gear, pull the handbrake, and park for 10 - 15 s;

[0049] After completing working conditions 1 - 17, drive out of the test site and enter the maintenance workshop for inspection. Check the vehicle to confirm that there is no damage to the relevant safety functions of the vehicle and there is no collision between the powertrain and the surrounding components of the engine compartment, and then conduct the second - round test;

[0050] Second round: After the first - round verification is passed, replace any one of the prepared main - spring - failed mounts with the corresponding normal mount on the vehicle, and then conduct the test according to the first - round test steps.

[0051] Third round: After the second - round verification is passed, replace any one of the prepared main - spring - failed mounts with the corresponding normal mount on the vehicle, and then conduct the test according to the first - round test steps.

[0052] Fourth round: After the third round of verification is passed, replace the corresponding normal mount on the vehicle with the remaining 1 prepared main spring failure mount, and then conduct the test according to the steps of the first round of test.

[0053] After completing all the above test procedures, check the whole vehicle. If no failure of the safety functions related to the mount system is found and there is no collision between the powertrain and the surrounding components of the engine compartment, the limit reliability verification of the mount system is passed.

[0054] The above are only the preferred embodiments of the present invention, and do not impose any formal restrictions on the structure of the present invention. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention all fall within the scope of the technical solution of the present invention.

Claims

1. A vehicle reliability verification method for suspension limit, characterized in that, It includes the following steps: S1. Prepare a plurality of target mount samples according to the design parameters of the target mount, and divide them into two groups. One group is untreated as a normal mount, and the other group is treated as a failed mount; S2. First, assemble the normal mount onto the vehicle, and verify the reliability of the mount limit under the pre-designed test conditions. If the verification result is qualified, execute step S3, otherwise output that the reliability test result of the mount limit for the whole vehicle is unqualified; S3. Select a failed mount in S1 to replace a normal mount on the vehicle, and verify the reliability of the mount limit again. If the verification result is qualified, execute step S4, otherwise output that the reliability test result of the mount limit for the whole vehicle is unqualified; S4. Repeat step S3, and successively use the prepared failed mounts to replace the normal mounts on the vehicle to verify the reliability of the mount limit until all the mounts on the vehicle are replaced by failed mounts. If both the replacement process and the reliability test result of the mount limit after complete replacement with failed mounts are qualified, then the reliability verification of the mount limit for the whole vehicle passes, otherwise output that the reliability test result of the mount limit for the whole vehicle is unqualified, and after optimizing the design parameters of the target mount, re-execute step S1.

2. The vehicle reliability verification method for suspension limit according to claim 1, wherein The normal mount described in S1 is produced by normal gluing and vulcanization processes. The failed mount is produced by directly vulcanizing without gluing or by cutting the main spring of the mount artificially after normal gluing and vulcanization processes.

3. A vehicle reliability verification method for suspension limit according to claim 1, characterized in that The verification of the reliability of the mount limit in S2 is carried out under the pre-designed test conditions, and the test conditions are designed according to the relevant test standards of the mount limit.

4. A vehicle reliability verification method for suspension limit according to claim 1, characterized in that, The standard for the qualified result of the verification of the reliability of the mount limit in S2 is that after the test, upon inspection, the target mount has no safety-related functional failures and there is no collision between the powertrain and the surrounding components of the engine compartment.

5. The vehicle reliability verification method for suspension limit according to claim 1, wherein When selecting a failed mount in S1 to replace a normal mount on the vehicle in S3, glue can be applied to the cut of the failed mount to slightly connect the cut for easy assembly.

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