Method for carrying out real vehicle abuse test on bolts of chassis of vehicle

Abstract

The invention provides a method for carrying out a real vehicle abuse test on a bolt of a chassis of a vehicle, and the method comprises the steps: arranging an axial force sensor on a to-be-tested bolt of the chassis of the vehicle, and enabling the axial force sensor to be used for measuring the axial force of the to-be-tested bolt; driving the vehicle to continuously carry out test items of a plurality of real vehicle abuse tests; when a vehicle performs a test item, the axial force of the to-be-tested bolt is collected in real time through the axial force sensor; and based on the axial force, obtaining the performance of the to-be-tested bolt under the abuse test condition. According to the method for carrying out the real vehicle abuse test on the bolts of the chassis of the vehicle, multiple test items of the real vehicle abuse test are continuously carried out in combination with the axial force sensor, the test workload is reduced, and the test efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a method for performing real vehicle abuse testing on bolts of a vehicle chassis. Background Art

[0002] The real vehicle abuse test of vehicle chassis bolts is one of the most important assessments of chassis bolt parts, which includes several independent test items. In the related technology, the test measurement method is to measure the torque of the bolt to be tested by a torque wrench after the test item is completed. This measurement method is a destructive measurement, which means that the bolt to be tested after the measurement cannot be tested for the next test item. After each test item, a new bolt to be tested needs to be replaced. The test workload is large, which affects the efficiency of the test. Summary of the invention

[0003] To at least partially solve the above-mentioned problems, an embodiment of the present application provides a method for conducting an actual vehicle abuse test on the bolts of a vehicle chassis, the method comprising: setting an axial force sensor on the bolt to be tested on the chassis of the vehicle, the axial force sensor being used to measure the axial force of the bolt to be tested; driving the vehicle to continuously perform multiple test items of the actual vehicle abuse test; when the vehicle performs the test items, collecting the axial force of the bolt to be tested in real time through the axial force sensor; based on the axial force, obtaining the performance of the bolt to be tested under the abuse test conditions.

[0004] In some embodiments, driving a vehicle to continuously perform multiple test items of real vehicle abuse tests includes: driving the vehicle to sequentially perform a brake road test, a square test, a reinforced road test, a threshold groove road test, and a curb stone test.

[0005] In some embodiments, the braking road test includes: on the braking road, driving the vehicle forward, accelerating the vehicle speed from 0 kph to 120 kph, maintaining the speed, and braking the vehicle to 0 kph with full force, triggering ABS; on the braking road, driving the vehicle in reverse, accelerating the vehicle speed from 0 kph to 40 kph, maintaining the speed, and braking the vehicle to 0 kph with full force, triggering ABS.

[0006] In some embodiments, the square test includes: in a fixed circle test field, maintaining the maximum vehicle speed that can stabilize the circle, driving around a fixed circle with a diameter of 69 to 71 meters, 4 circles counterclockwise, and then 4 circles clockwise; in a slalom test road, driving around a total of 11 pile cylinders consisting of 5 18-meter pile spacings and 5 25-meter pile spacings at the maximum vehicle speed at the maximum vehicle speed.

[0007] In some embodiments, the enhanced road test includes: driving at a speed of 40 kph through 199 to 201 meters of washboard road; driving at a speed of 40 kph through 59 to 61 meters of beam road; driving at a speed of 40 kph through 199 to 201 meters of billy stone road; driving at a speed of 40 kph through 59 to 61 meters of discus road; driving at a speed of 45 kph through 499 to 501 meters of uneven concrete road; the enhanced road test is repeated twice.

[0008] In some embodiments, the threshold groove road test includes: driving on the threshold road at a speed of 55 kph, passing a threshold of 79-81 mm high, repeated twice; driving on the groove road at a speed of 55 kph, passing a groove of 119-121 mm deep, repeated twice.

[0009] In some embodiments, the curb test includes: driving at a speed of 15 kph, reversing at an angle of 45 degrees, and hitting a curb with a height of 198 to 202 mm on a curb test field; driving at a speed of 15 kph, driving forward at an angle of 45 degrees, and hitting a curb with a height of 148 to 152 mm on a curb test field.

[0010] In some embodiments, a first difference between the axial force collected after the current test item is completed and the axial force collected after the previous test item of the current test item is completed is obtained, and the performance of the bolt to be tested is determined based on the proportion of the first difference to the axial force collected before the actual vehicle abuse test begins; and a second difference between the axial force collected after each test item is completed and the axial force before the actual vehicle abuse test begins is obtained, and the performance of the bolt to be tested is determined based on the proportion of the second difference to the axial force collected before the actual vehicle abuse test begins.

[0011] In some embodiments, the axial force collected in real time is compared with a predetermined threshold value. When the axial force collected in real time is less than the predetermined threshold value, the actual vehicle abuse test is terminated. The predetermined threshold value is determined based on an empirical value.

[0012] In some embodiments, setting an axial force sensor on a bolt to be tested on a chassis of a vehicle includes: milling the end face of the bolt to be tested so that it reaches the surface roughness required by the ultrasonic patch axial force sensor; setting an ultrasonic patch axial force sensor on the end face of the bolt to be tested; and calibrating the bolt to be tested on which the ultrasonic patch axial force sensor is set.

[0013] The embodiment of the present application provides a method for performing real vehicle abuse tests on the bolts of a vehicle chassis, which reduces the test workload and improves the test efficiency by combining an axial force sensor to continuously perform multiple test items of the real vehicle abuse test. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a flow chart of a method for performing real vehicle abuse testing on bolts of a vehicle chassis provided in an embodiment of the present application. DETAILED DESCRIPTION

[0016] The technical scheme of the preferred embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection claimed in the present application.

[0017] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] Combination Figure 1 An embodiment of the present application provides a method for performing an actual vehicle abuse test on bolts of a vehicle chassis, the method comprising: setting an axial force sensor on the bolt to be tested on the chassis of the vehicle, the axial force sensor being used to measure the axial force of the bolt to be tested; driving the vehicle to continuously perform multiple test items of the actual vehicle abuse test; when the vehicle performs the test items, collecting the axial force of the bolt to be tested in real time through the axial force sensor; based on the axial force, obtaining the performance of the bolt to be tested under the abuse test conditions.

[0019] In some embodiments, the axial force sensor is set on the bolt to be tested on the chassis of the vehicle, including: milling the end face of the bolt to be tested to achieve the surface roughness required by the ultrasonic patch axial force sensor; setting the ultrasonic patch axial force sensor on the end face of the bolt to be tested; calibrating the bolt to be tested with the ultrasonic patch axial force sensor. Specifically, the pre-processing operations of the bolt to be tested mainly include the following three items: using CNC machining equipment to mill the end face of the bolt to be tested to achieve the surface roughness required by the ultrasonic patch axial force sensor; installing the ultrasonic patch axial force sensor on the end face of the bolt, using timers, bolt clamping fixtures, sensor patches and catalysts and other auxiliary accessories, sticking the ultrasonic patch axial force sensor to the processed end face of the bolt to be tested, and waiting for subsequent test measurements; before testing, calibrating the bolt, installing the patch bolt in the corresponding vehicle model for field testing, and using the ultrasonic axial force measuring instrument and the auxiliary PC terminal to calibrate, collect and post-process the torque of the patch bolt that has been tested. In this embodiment, before the vehicle is tested, the vehicle with the heaviest axle load can be used and the largest tire size can be selected. Then check the status of the parts on the vehicle and determine the replacement of the supporting parts. Then replace the parts according to the drawings, tighten the bolts to be tested, calibrate and measure, adjust the four-wheel alignment, turn off the airbag, measure the wheel arch height and door clearance, load according to the maximum load, and adjust the tire pressure according to the standard.

[0020] The embodiment of the present application provides a method for performing real vehicle abuse tests on the bolts of a vehicle chassis, which reduces the test workload and improves the test efficiency by combining an axial force sensor to continuously perform multiple test items of the real vehicle abuse test.

[0021] In some embodiments, the test items of driving a vehicle to continuously perform multiple real vehicle abuse tests include: driving the vehicle to sequentially perform a brake road test, a square test, a reinforced road test, a threshold groove road test, and a curbstone test. In this embodiment, the above test items are arranged and tested in order of the degree of damage to the bolts to be tested from small to large, which can avoid the bolts to be tested from being damaged before all the test items are completed, affecting the test efficiency, and ensuring that the test can be completed smoothly.

[0022] Combined with Table 1, in some embodiments, the braking road test includes: on the braking road, driving the vehicle forward, accelerating the vehicle speed from 0 kph to 120 kph, maintaining the speed, braking to 0 kph, and triggering the ABS; on the braking road, driving the vehicle backward, accelerating the vehicle speed from 0 kph to 40 kph, maintaining the speed, braking to 0 kph, and triggering the ABS. In this embodiment, this test method can test the axial force of the bolt to be tested when the vehicle is fully accelerated and fully braked in both forward and reverse situations, so as to obtain the performance of the bolt to be tested under this working condition.

[0023] In some embodiments, the square test includes: in the fixed circle test field, maintaining the maximum speed that can stabilize the circle (providing the maximum lateral acceleration), driving around a fixed circle with a diameter of 69 to 71 meters (preferably 70 meters), 4 laps counterclockwise, and then 4 laps clockwise; in the slalom test road, driving around 11 piles consisting of 5 18-meter piles and 5 25-meter piles at the highest speed. In this embodiment, this test method can obtain the axial force of the bolts to be tested on the chassis of the vehicle under large lateral acceleration, thereby obtaining the performance of the bolts to be tested under this working condition.

[0024] In some embodiments, the reinforced road test includes: driving at a speed of 40kph, passing 199 to 201 meters (preferably 200 meters) of washboard road; driving at a speed of 40kph, passing 59 to 61 meters (preferably 60 meters) of beam road; driving at a speed of 40kph, passing 199 to 201 meters (preferably 200 meters) of billy stone road; driving at a speed of 40kph, passing 59 to 61 meters (preferably 60 meters) of discus road; driving at a speed of 45kph, passing 499 to 501 meters (preferably 500 meters) of uneven cement road; the reinforced road test is repeated twice. In this embodiment, this test method can obtain the axial force of the bolt to be tested of the chassis when the vehicle is driving on a bumpy road, thereby obtaining the performance of the bolt to be tested under this working condition. By performing two reinforced road tests, the strength of the reinforced road test can be ensured.

[0025] In some embodiments, the threshold groove road test includes: driving at a speed of 55 kph on the threshold road, passing through a threshold with a height of 79 to 81 mm (preferably 80 mm), and repeating twice; driving at a speed of 55 kph on the groove road, passing through a groove with a depth of 119 to 121 mm (preferably 120 mm), and repeating twice. In this embodiment, this test method can obtain the axial force of the bolt to be tested of the chassis when the vehicle encounters a large bump, thereby obtaining the performance of the bolt to be tested under this working condition.

[0026] In some embodiments, the curbstone test includes: driving at a speed of 15 kph, reversing at an angle of 45°, and hitting a curbstone 198 to 202 mm (preferably 200 mm) high at a curbstone test site; driving at a speed of 15 kph, driving forward at an angle of 45°, and hitting a curbstone 148 to 152 mm (preferably 150 mm) high at a curbstone test site. In this embodiment, this test method can obtain the axial force of the bolt to be tested of the chassis when the vehicle is subjected to a large impact, thereby obtaining the performance of the bolt to be tested under this working condition.

[0027] The above tests may include five types of sites, the implementation of a total of 18 test plans, and a total of 10 bolt force test points.

[0028] During the test, pay attention to changes in vehicle status and unusual noises. When measuring the tightening force, also observe whether the parts have cracks. For test items where the tightening force decays significantly during the test or is on the edge of the qualified critical value, special retests can be carried out later, and the number of measurement points can be increased to twice the original number of measurement points during the test, and then the qualification can be determined based on the test results.

[0029] As shown in Table 1, after some test items are completed, measure the wheel arch height and record it. Take photos of the test parts. Unload, measure the wheel alignment parameters and record them. At the end of the test, disassemble and inspect the test parts, perform flaw detection and size comparison, etc.

[0030] Table 1

[0031]

[0032] In some embodiments, the real-time collected axial force is compared with a predetermined threshold value. When the real-time collected axial force is less than the predetermined threshold value, the real vehicle abuse test is terminated. The predetermined threshold value is determined based on an empirical value. In this embodiment, by real-time monitoring of the axial force, safety is improved, and tracking is used to determine whether the test can continue, to prevent safety risks caused by the force value being attenuated without knowing it. At the same time, it can also avoid meaningless damage to the vehicle and possible danger to people caused by continuing the test when the test piece has failed due to human inability to know.

[0033] Combined with Table 2, in some embodiments, the first difference between the axial force collected after the test of the current test item is completed and the axial force collected after the test of the previous test item of the current test item is completed is obtained, and the performance of the bolt to be tested is determined based on the proportion of the first difference to the axial force collected before the actual vehicle abuse test begins; and the second difference between the axial force collected after each test item is completed and the axial force collected before the actual vehicle abuse test begins is obtained, and the performance of the bolt to be tested is determined based on the proportion of the second difference to the axial force collected before the actual vehicle abuse test begins. In this embodiment, the influence of the current test item on the axial force of the bolt to be tested can be obtained by the proportion of the first difference to the axial force collected before the actual vehicle abuse test begins, and the cumulative influence of the completed test items on the axial force of the bolt to be tested can be obtained by the proportion of the second difference to the axial force collected before the actual vehicle abuse test begins, thereby achieving overall control of the bolt performance and preventing the situation where the bolt to be tested barely meets the standard in multiple test items but does not actually meet the requirements. It should be noted that the test items in this embodiment are not limited to the brake road test, the square test, the reinforced road test, the threshold groove road test and the curb stone test, but also include the sub-items contained in these tests, as shown in the serial numbers 1-18 in Table 2.

[0034] Table 2

[0035]

[0036] As shown in Table 2, in a preferred embodiment, after the brake road test, the first difference and the second difference account for less than 10% and 10% of the axial force collected before the actual vehicle abuse test, respectively; after the square test, the first difference and the second difference account for less than 5% and 15% of the axial force collected before the actual vehicle abuse test, respectively; after the first enhanced road test, the first difference and the second difference account for less than 5% and 20% of the axial force collected before the actual vehicle abuse test, respectively; after the second enhanced road test, the first difference and the second difference account for less than 5% and 23% of the axial force collected before the actual vehicle abuse test, respectively; in the threshold ditch road test, after the first threshold road test, the first difference and the second difference account for less than 5% and 23% of the axial force collected before the actual vehicle abuse test, respectively. After crossing the threshold road for the second time, the first difference and the second difference shall account for less than 10% and 28% of the axial force collected before the actual vehicle abuse test. After crossing the ditch road for the first time, the first difference and the second difference shall account for less than 10% and 32% of the axial force collected before the actual vehicle abuse test. After crossing the ditch road for the second time, the first difference and the second difference shall account for less than 10% and 32% of the axial force collected before the actual vehicle abuse test. In the curb stone test item, after the oblique rear collision test, the first difference and the second difference shall account for less than 5% and 35% of the axial force collected before the actual vehicle abuse test. After the oblique front collision test, the first difference and the second difference shall account for less than 5% and 35% of the axial force collected before the actual vehicle abuse test.

[0037] The method for performing a real vehicle abuse test on the bolts of a vehicle chassis provided by the embodiment of the present application has at least the following beneficial effects:

[0038] 1. The present invention can achieve precise measurement of each test link with high accuracy. It is a direct measurement method rather than an indirect measurement method using torque. The axial force is inferred by measuring the propagation speed of ultrasonic waves in the bolt, avoiding the influence of torque coefficient dispersion and greatly improving the measurement accuracy.

[0039] 2. The traditional method is interruptive, while the present invention is non-interruptive. The measurement adopts a contact non-destructive form, which does not affect the state of the bolts and related parts, and the test and measurement can continue.

[0040] 3. The process can be recorded, and the force attenuation of each working condition, each threshold or groove impact, and the force attenuation of each round of reinforcement road can be measured. In theory, the tightening force of any section during the test can be measured to obtain the changing law of the bolt axial force.

[0041] 4. Based on this test, we can add the force attenuation measurement after special driving behavior to understand the relationship between bolt loosening and driving dynamics. We can also understand which special driving forms have a more obvious impact on bolt force attenuation and their influencing factors.

[0042] 5. The test process can be monitored to improve safety and track whether the test can continue to prevent safety risks caused by the force value being attenuated without knowing it. It can also avoid meaningless damage to the vehicle and possible danger to people caused by continuing the test when the test piece has failed due to human failure.

[0043] 6. The original measurement usually requires at least 2 people, one person tightens the torque wrench, and the other stares at the digital display and records at any time. However, this method only requires one person to use the ultrasonic instrument to measure, saving manpower. At the same time, the ultrasonic axial force measuring instrument is easy to carry and has strong mobility.

[0044] Based on the above-mentioned embodiments of the present application, in the absence of explicit negation or conflict, the technical features of one embodiment may be beneficially combined with one or more other embodiments.

[0045] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are only for illustration and not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A method for performing a real vehicle abuse test on a bolt of a vehicle chassis, characterized in that: include: An axial force sensor is arranged on the bolt to be tested of the chassis of the vehicle, and the axial force sensor is used to measure the axial force of the bolt to be tested; A test item in which the vehicle is driven to conduct multiple consecutive real vehicle abuse tests; When the vehicle performs the test item, the axial force of the bolt to be tested is collected in real time by the axial force sensor; Based on the axial force, the performance of the bolt to be tested under abuse test conditions is obtained.

2. The method according to claim 1, characterized in that The vehicle is driven continuously to conduct multiple real vehicle abuse test items, including: The vehicle is driven to sequentially perform a brake road test, a square test, a reinforced road test, a threshold ditch road test, and a curbstone test.

3. The method according to claim 2, characterized in that The brake circuit test includes: On the braking road, the vehicle is driven forward, the vehicle speed is accelerated from 0 kph to 120 kph, and then the vehicle speed is maintained and the vehicle speed is braked to 0 kph, triggering the ABS; On the braking road, the vehicle is driven in reverse, the vehicle speed is accelerated from 0 kph to 40 kph, and then the vehicle speed is braked to 0 kph with full force, triggering the ABS.

4. The method according to claim 2, characterized in that: The square test includes: At the fixed circle test site, maintain the maximum speed that can keep the circle steady, and drive around a fixed circle with a diameter of 69 to 71 meters, 4 times counterclockwise, and then 4 times clockwise; On the slalom test course, the vehicle is driven at maximum speed around a total of 11 slalom cylinders, consisting of 5 18-meter-distance slalom cylinders and 5 25-meter-distance slalom cylinders.

5. The method according to claim 2, characterized in that: The enhanced road test includes: Drive at a speed of 40 kph and pass 199 to 201 meters of washboard road; Drive at a speed of 40kph and pass the 59-61m beam road; Drive at a speed of 40 kph and pass the 199-201-meter Billy Stone Road; Drive at a speed of 40kph and pass the 59-61m discus road; Drive at a speed of 45kph and pass 499-501 meters of uneven concrete road; The intensive road test was repeated twice.

6. The method according to claim 2, characterized in that The threshold trench test includes: On the threshold road, drive at a speed of 55kph and pass a threshold 79-81mm high. Repeat twice. On a ditch road, drive at a speed of 55kph through a ditch 119 to 121mm deep, and repeat twice.

7. The method according to claim 2, characterized in that The kerb test includes: At the kerb test site, drive at a speed of 15kph, reverse at a 45° angle, and hit a 198-202mm high kerb. At the curbstone test site, the vehicle was driven at a speed of 15 kph, moving forward at a 45° angle, and hitting a 148 to 152 mm high curbstone.

8. The method according to claim 1, characterized in that Obtaining a first difference between the axial force collected after the current test item is finished and the axial force collected after the test item before the current test item is finished, and determining the performance of the bolt to be tested based on the proportion of the first difference to the axial force collected before the actual vehicle abuse test begins; as well as Obtain a second difference between the axial force collected after each test item is completed and the axial force before the actual vehicle abuse test begins, and determine the performance of the bolt to be tested based on the proportion of the second difference to the axial force collected before the actual vehicle abuse test begins.

9. The method according to claim 1, characterized in that: The axial force collected in real time is compared with a predetermined threshold value. When the axial force collected in real time is less than the predetermined threshold value, the actual vehicle abuse test is terminated. The predetermined threshold value is determined based on an empirical value.

10. The method according to claim 1, characterized in that An axial force sensor is arranged on a bolt to be tested on the chassis of the vehicle, comprising: Milling the end face of the bolt to be tested to achieve the surface roughness required by the ultrasonic patch axial force sensor; The ultrasonic patch axial force sensor is arranged on the end surface of the bolt to be tested; The bolt to be tested provided with the ultrasonic patch axial force sensor is calibrated.

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