CN112345271B - Vehicle dynamic rollover test device and method - Google Patents

Abstract

The invention discloses a vehicle dynamic rolling test device and a method thereof. The equipment comprises a rolling test device, wherein the rolling test device comprises a test surface, the test surface is one or more of a silt surface, an upper slope surface and a lower slope surface, and the test surface is used for providing different rolling speeds and rolling angles for the vehicle to be tested so as to enable the lateral acceleration of the vehicle to be tested to reach critical acceleration; the critical acceleration is the lateral acceleration to which the vehicle to be tested is subjected calculated according to the vehicle rollover model. After the traction system accelerates the vehicle to be tested to a preset test speed, the vehicle to be tested passes through the test surface, so that the data acquisition device acquires working condition test data of the vehicle to be tested in the running and rolling process in real time, and the working condition test data are used for calibrating the vehicle design. According to the invention, through different working condition simulation, relevant working condition test data can be accumulated and used for calibrating vehicle design, the safety performance development capability of the whole vehicle is improved, and hidden danger to personnel after a side-turning accident of the vehicle is reduced.

Description

Vehicle dynamic rollover test device and method

Technical Field

The present invention relates to the field of vehicle entertainment technology, and in particular to a vehicle dynamic rollover test device and a method thereof.

Background technique

Airbags are a very important part of the passive safety system of automobiles, and their reliability is an extremely critical indicator in the airbag design process. If a missed explosion, delayed explosion, or misfire occurs, it will cause great harm to the occupants. The draft for comments on the existing mandatory standards and regulations, "Methods and Requirements for Misoperation Tests of Automobile Airbag Systems", mainly includes three types of testing methods: static tests, roadblock tests, and rough road tests. The tests for automobile side airbags are mainly basketball impact tests, bicycle simulation impact tests, and side shoulder impact tests, all of which are conducted by impacting the side of the vehicle with a collision object to check the misoperation safety of the side airbags. The remaining dynamic tests are impact tests with the vehicle in normal posture.

However, during normal vehicle driving, many types of rollover conditions may occur. For example, rollover conditions are more common on mountain roads, sandy roads, rainy days or in the north. Since rollover conditions exist in many different degrees, the side airbags implement different functions according to different conditions. However, the current airbag ECU verification test cannot achieve functional verification of the vehicle under dynamic rollover conditions. Vehicles designed according to the existing vehicle design and calibration standards still pose a great risk to personnel after a car rollover accident.

Summary of the invention

The purpose of the present invention is to provide a vehicle dynamic rollover test device and method, which can solve the problem that the current airbag ECU verification test cannot achieve functional verification of the vehicle under dynamic rollover conditions, and the vehicle designed according to the existing vehicle design and calibration standards still has great hidden dangers to people after the car rollover accident.

An embodiment of the present invention provides a vehicle dynamic rollover test device, comprising a rollover test device, wherein the rollover test device comprises a test surface, wherein the test surface is one or more of a muddy surface, an upper slope surface, and a lower slope surface, and the test surface is used to provide different rollover speeds and rollover angles for the vehicle to be tested, so that the lateral acceleration of the vehicle to be tested reaches a critical acceleration; wherein the critical acceleration is the lateral acceleration of the vehicle to be tested that is calculated according to a vehicle rollover model.

After the traction system accelerates the vehicle to be tested to a predetermined test speed, the vehicle to be tested passes through the test surface so that the data acquisition device collects the operating condition test data of the vehicle to be tested during driving and rolling in real time; wherein the operating condition test data is used for calibration of vehicle design.

The embodiment of the present invention further provides a vehicle dynamic rollover test method, which is applied to the vehicle dynamic rollover test device in the above embodiment, and the method includes:

Establishing a vehicle rollover model, and calculating the critical acceleration of the vehicle to be tested when it rolls over according to the vehicle rollover model; wherein the critical acceleration is the lateral acceleration to which the vehicle to be tested is subjected when it rolls over;

Accelerating the vehicle to be tested to a predetermined test speed through a traction system, and making the vehicle to be tested pass through the test surface; wherein the test surface is used to provide different rolling speeds and rolling angles for the vehicle to be tested, so that the lateral acceleration of the vehicle to be tested reaches the critical acceleration;

The working condition test data of the vehicle to be tested during driving and rolling are collected in real time by a data collection device; wherein the working condition test data is used for calibration of vehicle design.

Compared with the prior art, the vehicle dynamic rollover test equipment in the embodiment of the present invention can simulate various rollover conditions in actual road conditions, and add a test verification method for the whole vehicle in the airbag ECU development process. Through the simulation of different working conditions, relevant dynamic rollover condition test data can be accumulated and used for vehicle design calibration, thereby improving the whole vehicle safety performance development capability, reducing the hidden dangers to personnel after a car rollover accident, and improving the independent ability of new technology research and development.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic structural diagram of a vehicle dynamic rollover test device provided by an embodiment of the present invention;

FIG2 is a schematic flow chart of a vehicle dynamic rollover test method in an embodiment of the present invention;

FIG3 is a schematic diagram of a vehicle rollover model provided by an embodiment of the present invention;

4 is a schematic structural diagram of a mud and sand rollover test device in a vehicle dynamic rollover test device provided by an embodiment of the present invention;

5 is a schematic structural diagram of a ramp rollover test device in a vehicle dynamic rollover test device provided by an embodiment of the present invention;

FIG6 is a schematic structural diagram of a ditch rollover test device in a vehicle dynamic rollover test device provided in an embodiment of the present invention.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

It should be understood that the step numbers used in this article are only for the convenience of description and are not intended to limit the order in which the steps are executed.

It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and/or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or combinations thereof.

The term "and/or" means and includes any and all possible combinations of one or more of the associated listed items.

Please refer to FIG1 . The embodiment of the present invention provides a vehicle dynamic rollover test device 100, including a rollover test device 10. The rollover test device 10 includes a test surface 101. The test surface 101 is one or more of a muddy surface, an upper slope surface, and a lower slope surface. The test surface 101 is used to provide different rollover speeds and rollover angles for the vehicle 300 to be tested, so that the vehicle 300 to be tested reaches a critical acceleration; wherein the critical acceleration is the lateral acceleration of the vehicle 300 to be tested calculated according to the vehicle rollover model. After the traction system 200 accelerates the vehicle 300 to a predetermined test speed, the vehicle 300 to be tested passes through the test surface 101, so that the data acquisition device collects the working condition test data of the vehicle 300 to be tested during driving and rolling in real time; wherein the working condition test data is used for the calibration of the vehicle design.

Correspondingly, referring to FIG. 2 , an embodiment of the present invention further provides a vehicle dynamic rollover test method, which is applied to the above-mentioned vehicle dynamic rollover test device 100. The method comprises the following steps:

S10, establishing a vehicle rollover model, and calculating the critical acceleration of the test vehicle 300 when it rolls over according to the vehicle rollover model; wherein the critical acceleration is the lateral acceleration to which the test vehicle 300 is subjected when it rolls over;

S20, accelerating the vehicle 300 to a predetermined test speed through the traction system 200, so that the vehicle 300 passes through the test surface 101; wherein the test surface 101 is used to provide different rolling speeds and rolling angles for the vehicle 300 to make the vehicle 300 reach a critical acceleration;

S30, collecting the working condition test data of the vehicle 300 to be tested in real time during the driving and rolling process through the data acquisition device; wherein the working condition test data is used for calibration of vehicle design.

It should be noted that the data acquisition device includes a vehicle-mounted data acquisition device, a high-speed camera and a speed tester. The vehicle dynamic rollover test device 100 in the embodiment of the present invention can include a data acquisition device itself, or it can be equipped with a data acquisition device in other devices to collect the working condition test data of the vehicle 300 to be tested in real time during driving and rolling. The working condition test data includes but is not limited to the vehicle speed during rollover, rollover acceleration, and the action time of the side air curtain and side airbag, etc., which are not specifically limited here.

In the embodiment of the present invention, the premise of designing the vehicle dynamic rollover test equipment 100 and the entire test is to determine the whole vehicle rollover test conditions, and to analyze the real traffic accident data. According to the three types of rollover causes obtained after the analysis of NHTSA statistical data: (1) When the car is driving at high speed, the wheels are affected by ground obstacles, causing the body inclination angle to change rapidly, resulting in rollover; (2) The car is on a road with poor road conditions, and the road slope changes cause the vehicle to slide. When the lateral acceleration of the vehicle body exceeds the limit, the vertical reverse force of the inner wheel of the car is zero, resulting in rollover; (3) The car slides on a road with poor adhesion and is hit or not hit by side obstacles, causing the vehicle to roll over. After the above three rollover conditions are selected, the actual test speed of the vehicle rollover condition can be obtained by calculating the design parameters of the vehicle and the actual rollover conditions.

To this end, the present invention first establishes a vehicle rollover model. According to theoretical knowledge, when the vertical force on one side of the vehicle is zero, the vehicle rolls over. Ignoring the variability of the vehicle and solidifying the vehicle, the vehicle is mainly subjected to gravity, centrifugal force, road support force and lateral force under normal force conditions, forming the following schematic diagram as shown in Figure 3.

According to the vehicle's stable state, the sum of the moments at the contact point between the wheels on one side of the vehicle and the ground is taken as zero, and the following formula can be obtained:

After transformation through formula (1), we can get:

Among them, A is the wheelbase of the car, m is the mass of the car, _hg is the mass height of the car, _ay is the lateral acceleration, α is the road inclination slope, _Fyi is the reverse force supported by the inner tire, and _Fyo is the reverse force supported by the outer tire.

Formula (2) shows that as the lateral acceleration _ay increases, the reverse force _Fyi supported by the inner tire of the car decreases accordingly. When the reverse force _Fyi of the inner tire decreases to zero, the car cannot maintain balance in the roll plane and begins to roll over. At this time, the lateral acceleration _ay that the vehicle is subjected to is the critical acceleration The critical acceleration _ay is related to the wheelbase A of the vehicle 300 to be tested, the vehicle mass height _hg , and the road inclination gradient α. When the road inclination gradient α is constant, different parameters of the vehicle 300 to be tested correspond to different critical acceleration _ay , which can be calculated in actual testing.

Then, the critical acceleration value of the vehicle rollover is simulated by the above model, and the speed range of the test vehicle under the corresponding working condition is calculated by simulation, and then reproduced in the vehicle dynamic rollover test equipment 100 to verify the performance of the airbag ECU under the dynamic rollover working condition, thereby verifying whether the vehicle test data meets the design requirements of the vehicle safety, and the obtained working condition test data is used for the calibration of the vehicle design to further develop the safety performance of the vehicle. By enriching the calibration of the vehicle design, the ECU can more accurately control the side air curtain and side airbag action to protect the occupants while reducing maintenance costs.

To better understand the concept of the present invention, the vehicle dynamic rollover test device 100 and the vehicle dynamic rollover test method in the embodiments of the present invention are described in detail with reference to the accompanying drawings and specific embodiments.

Please refer to FIG. 4 . In one embodiment, the rollover test device 10 includes a mud and sand rollover test device 110 . The test surface 101 is a mud and sand surface. The mud and sand rollover test device 110 includes a first vehicle driving platform 1 , a vehicle rolling mud and sand area 2 , a damping device and a first control console. The first vehicle driving platform 1 is arranged opposite to the vehicle rolling mud and sand area 2 , and is used to carry the vehicle 300 to be tested. It is fixedly connected to the traction system 200 , and the first control console is electrically connected to the traction system 200 . The damping device includes a first damper and a second damper, and the first damper and the second damper are respectively fixed to the horizontal ground, and are respectively used to decelerate the vehicle 300 to be tested; wherein the buffering degree of the first damper is greater than the buffering degree of the second damper.

Please continue to refer to Fig. 4, in a certain embodiment, the first damper includes a spring damper 4, and the second damper includes a springless damper 3. The springless damper 3 is adjustable in length, while the spring damper 4 is not adjustable in length, so that the damping degrees of the two are different.

The mud and sand rolling test device 110 in the embodiment of the present invention is also called a Soil test device. The Soil test device includes two test structures: one includes a vehicle tire baffle 5, and the other does not include a vehicle tire baffle 5. The vehicle tire baffle 5 can be used to adjust the rolling posture of the vehicle 300 to be tested during the movement, and the rolling posture includes a rolling speed and a rolling angle. The two test structures provide different rolling speeds and rolling angles for the vehicle 300 to be tested, so that the vehicle 300 to be tested can reach the critical acceleration respectively, so as to obtain the working condition test data of the vehicle 300 to be tested during the driving and rolling process, so as to be used for the calibration of the vehicle design.

Specifically, the Soil test device without the vehicle tire baffle 5 simulates the working condition of the vehicle sliding into the beach or a pile of dirt. Two different dampers are used: an adjustable length non-spring damper 3 and a non-adjustable length spring damper 4 to achieve the deceleration curve required by the test to achieve the working condition of the vehicle rolling into the beach in different postures.

The device with the vehicle tire baffle 5 in the soil test simulates the working condition that the vehicle rolls over onto the beach or a pile of earth after hitting the shoulder of the road after skidding. The vehicle 300 to be tested is carried on the first vehicle driving platform 1, and the traction mechanism of the traction system 200 is controlled by the first control console to accelerate the vehicle 300 to the predetermined test speed. Two different dampers are also used: a springless damper 3 and a spring damper 4 to achieve the deceleration curve required by the test to achieve the working condition of the vehicle rolling over into the beach in different postures. The vehicle 300 to be tested is placed on the first vehicle driving platform 1, and the vehicle tire baffle 5 is fixed to the driving platform mounting seat 6 by bolts, and the vehicle posture is controlled by the vehicle tire baffle 5. The springless damper 3 and the spring damper 4 are fixed to the ground anchor by bolts, and the damping change after the damper is extended and shortened can achieve the test requirements of different deceleration curves.

The specific structure is as follows: the Soil test device includes a first vehicle driving platform 1, a vehicle rolling mud and sand area 2, a springless damper 3, a spring damper 4, a vehicle tire baffle 5, a driving platform mounting seat 6, a driving platform deceleration baffle 7 and a first control console. The first vehicle driving platform 1 is fixed by a traction system 200, the vehicle rolling mud and sand area 2 is fixed by a fence, the springless damper 3 and the spring damper 4 are fixed to the driving runway anchor by bolts, and the vehicle tire baffle 5 is fixed to the driving platform mounting seat 6 of the first vehicle driving platform 1 by bolts.

Please continue to refer to Figure 4. In a certain embodiment, the mud and sand rolling test device 110 also includes a vehicle tire baffle 5 and a driving platform mounting seat 6. The driving platform mounting seat 6 is fixed to the side area of the first vehicle driving platform 1 and is used to adjust the posture of the vehicle 300 to be tested during movement. The vehicle tire baffle 5 is fixed to the driving platform mounting seat 6.

In the embodiment of the present invention, the vehicle tire baffle 5 is fixed to the traveling platform mounting seat 6 of the first vehicle traveling platform 1 by means of bolts.

Please continue to refer to FIG. 4 . In one embodiment, the mud and sand rolling test device 110 further includes a driving platform deceleration baffle 7 . The driving platform deceleration baffle 7 is fixed on both sides of the first vehicle driving platform 1 and is used to decelerate the vehicle 300 to be tested.

In the embodiment of the present invention, the travel platform deceleration baffle 7 is fixed on the first vehicle travel platform 1 by bolts.

Therefore, when the rollover test device 10 is a mud and sand rollover test device 110 and the test surface 101 is a mud and sand surface, the corresponding vehicle dynamic rollover test method is specifically as follows:

In one embodiment, step S20 accelerates the vehicle 300 to a predetermined test speed through the traction system 200 and makes the vehicle 300 pass through the test surface 101, including the following steps:

S21, accelerating the first vehicle driving platform 1 on which the vehicle to be tested 300 is placed on the mud and sand rolling test device 110 to a predetermined test speed through the traction system 200;

S22, decelerating the vehicle 300 to be tested according to a predetermined deceleration curve by means of the first damper and the second damper of the mud and sand rolling test device 110 respectively, so that the vehicle 300 to be tested passes through the vehicle rolling mud and sand area 2 from the first vehicle driving platform 1, and the lateral acceleration of the vehicle 300 to be tested reaches a critical acceleration.

In one embodiment, after the first vehicle driving platform 1 on which the vehicle to be tested 300 is placed on the mud and sand rolling test device 110 is accelerated to a predetermined test speed by the traction system 200, the method further includes the following steps:

S23, controlling the vehicle 300 to be tested to pass through the vehicle tire baffle 5 on the first vehicle driving platform 1, so that the vehicle tire baffle 5 of the mud and sand rolling test device 110 adjusts the rolling posture of the vehicle 300 to be tested during the movement, and the rolling posture includes the rolling speed and the rolling angle.

Before the Soil test begins, the following preparation steps are also included:

(I) Vehicle preparation

a) Vehicle mass. After the fuel and other liquids are removed from the vehicle, the mass is compensated to the curb mass, and the tire pressure is determined to be the design value (first weighing). After the on-board test equipment is installed, an H3-50 dummy is placed in the driver's seat (different dummies can be placed in the other seats according to R&D needs). This mass is the test mass (second weighing).

b) Vehicle preparation: Stop the vehicle steering wheel to prevent the vehicle from driving in a straight line, which helps maintain test consistency.

c) Seat adjustment: the driver's seat is in the middle of the front-to-back position, the up-down position is the lowest, the backrest is in the normal driving position, and the seat belt is in the highest position.

d) Equipment installation: install vehicle brakes, batteries, data loggers, high-speed cameras, and various sensors such as vehicle acceleration, angular velocity, and door pressure according to test requirements.

e) Test speed: set the test traction speed through the test speed calculated by simulation, make the test vehicle reach the predetermined test speed through the traction system 200, and use the speedometer to record the actual rolling speed.

(II) Preparation of Soil Test Device

a) The Soil test device without the vehicle tire baffle 5 simulates the working condition of the vehicle sliding into the beach or a pile of earth. Two different dampers are also used, the springless damper 3 and the spring damper 4, to achieve the deceleration curve required by the test, thereby realizing the working condition of the vehicle rolling into the beach or a pile of earth in different postures.

b) The Soil test device with a vehicle tire baffle 5 simulates the working condition of a vehicle rolling over onto a beach or a pile of earth after hitting the shoulder of the road after skidding. The first vehicle driving platform 1 carries the vehicle 300 to be tested, and the first control console controls the traction mechanism of the traction system 200 to accelerate the vehicle 300 to a predetermined test speed. Two different dampers are also used: a springless damper 3 and a spring damper 4 to achieve the deceleration curve required by the test to achieve the working condition of the vehicle rolling over into the beach or a pile of earth in different postures. The vehicle 300 to be tested is placed on the first vehicle driving platform 1, and the vehicle tire baffle 5 is bolted to the driving platform mounting seat 6, and the vehicle posture is controlled by the vehicle tire baffle 5. The springless damper 3 and the spring damper 4 are bolted to the ground anchor, and the damping change after the damper is extended and shortened can achieve the test requirements of different deceleration curves.

(III) Test preparation

a) Positioning of the test vehicle and tooling: The test vehicle is placed longitudinally centered on the first vehicle driving platform 1. In the working condition with a baffle, the vehicle's main driver side tire is close to the vehicle tire baffle 5. In the working condition without a baffle, the vehicle's main driver side tire is 200±10 (mm) away from the edge of the driving platform.

b) The sand in the sand pit needs to be leveled before testing to maintain test consistency.

c) The test vehicle is confirmed to be ready for departure, the on-board data acquisition instrument is set up normally, the high-speed camera is set up normally, the speed tester is set up normally, and the traction system 200 and the damper are confirmed to be normal.

d) The test matrix is based on the following Table 1 and may be adjusted as needed to meet special operating conditions for reproducing a real traffic accident.

Table 1

Test No. Test speed (km/h) Damper Type With or without baffle 1 30 With spring none 2 30 With spring have 3 30 No spring none 4 30 No spring have

In summary, the mud and sand rollover test device 11 and the test method thereof in the embodiment of the present invention realize the verification of the vehicle rollover condition caused by the vehicle sliding sideways on a road surface with poor adhesion (such as a beach or a mound) with or without being hit by a side obstacle. The test device is simple in design, and the expected test effect and consistency are good. At the same time, the dynamic rollover condition test data is accumulated for use in the calibration of vehicle design, thereby improving the safety performance development capability of the entire vehicle, reducing the hidden dangers to personnel after a car rollover accident, and improving the independent capability of new technology research and development.

Please refer to Figure 5. In a certain embodiment, the rollover test device 10 also includes a ramp rollover test device 120. The test surface 101 is an upper slope surface. The ramp rollover test device 120 includes a first-level guide platform fixing seat 8, a first-level guide platform surface 9, a first-level guide platform hydraulic lifting frame 22, a first-level guide platform telescopic bracket 11, a second-level rollover platform fixing seat 12, a second-level rollover platform hydraulic lifting frame 13, a second-level rollover platform telescopic bracket 14, a second-level rollover table surface telescopic platform 15 and a second control console.

The first-level guide platform fixed seat 8 is connected to the first-level guide platform table 9 through the first-level guide platform hydraulic lifting frame 22 and the first-level guide platform telescopic bracket 11, and the end surface of the first-level guide platform fixed seat 8 is movably connected to the end surface of the first-level guide platform table 9. The second-level rolling platform fixed seat 12 is movably connected to the first-level guide platform table 9, and the second-level rolling platform hydraulic lifting frame 13 and the second-level rolling platform telescopic bracket 14 are respectively fixed to the second-level rolling platform fixed seat 12. The second-level rolling platform telescopic platform 15 is connected to the second-level rolling platform fixed seat 12 and fixed to the second-level rolling platform telescopic bracket 14 by a diagonal brace structure. The second control console is electrically connected to the first-level guide platform hydraulic lifting frame 22 and the second-level rolling platform hydraulic lifting frame 13 respectively.

The ramp rollover test device 120 in the embodiment of the present invention is also called a ramp test device. The ramp test device simulates the working condition of a vehicle rolling sideways after the vehicle runs out of control by rushing up a slope on one side. The relative angle between the first-level guide table 9 and the second-level rollover table telescopic table 15 is adjusted by the second control console to provide different rollover speeds and rollover angles for the vehicle 300 to be tested, so that the vehicle 300 to be tested reaches the critical acceleration, so as to obtain the working condition test data of the vehicle 300 to be tested during driving and rolling, and meet the test requirements for different vehicle postures.

Its specific structure is: the ramp test device includes a first-level guide platform fixed seat 8, a first-level guide platform table 9, a first-level guide platform hydraulic lifting frame 22, a first-level guide platform telescopic bracket 11, a second-level rolling platform fixed seat 12, a second-level rolling platform hydraulic lifting frame 13, a second-level rolling platform telescopic bracket 14, a second-level rolling platform telescopic platform 15 and a second control console.

The first-level guide platform fixed seat 8 is connected to the first-level guide platform table 9 through the first-level guide platform hydraulic lifting frame 22 and the first-level guide platform telescopic bracket 11. The angle of the table is electrically controlled by the second control console to adjust the height of the first-level guide platform hydraulic lifting frame 22 to achieve the angle between the first-level guide platform table 9 and the test ground. After reaching the angle required by the test, the first-level guide platform table 9 is fixed on the first-level guide platform fixed seat 8 by the first-level guide platform telescopic bracket 11 through the moving hole. The second-level tumbling platform fixed seat 12 is connected to the first-level guide platform table 9 through a rotating hinge, and the second-level tumbling platform hydraulic lifting frame 13 and the second-level tumbling platform telescopic bracket 14 are fixed by bolts. The second control console electrically controls and adjusts the height of the second-level tumbling platform hydraulic lifting frame 13 to achieve the angle adjustment between the second-level tumbling platform fixed seat 12 and the first-level guide platform table 9. After reaching the angle required by the test, it is fixed by the second-level tumbling platform telescopic bracket 14. The secondary rolling table telescopic platform 15 is connected to the secondary rolling table fixing seat 12 through a telescopic frame, and the length of the secondary rolling table telescopic platform 15 is changed by telescoping to meet the requirements of the vehicles 300 to be tested with different wheelbases.

Therefore, when the rollover test device 10 is a ramp rollover test device 120 and the test surface 101 is an upward slope surface, the corresponding vehicle dynamic rollover test method is specifically as follows, and the method further includes the following steps:

S40. According to a predetermined ramp working condition table, set the angle between the first-level guide platform surface 9 of the ramp rollover test device 120 and the horizontal ground, set the angle between the first-level guide platform surface 9 and the second-level rollover platform fixing seat 12, and set the length of the second-level rollover platform telescopic platform 15.

In a specific embodiment, the predetermined ramp working conditions are shown in Table 2.

Then step S20 accelerates the vehicle 300 to a predetermined test speed through the traction system 200 and makes the vehicle 300 pass through the test surface 101, and further includes the following steps:

S24, accelerating the vehicle 300 to a predetermined test speed through the traction system 200, so that the vehicle 300 passes through the first-level guide platform surface 9, the surface of the second-level rolling platform fixing seat 12 and the second-level rolling platform telescopic platform 15 in sequence, and the lateral acceleration of the vehicle 300 reaches a critical acceleration.

Before the ramp test begins, the following preparation steps are also included:

(I) Vehicle preparation

The whole vehicle preparation refers to the entire process of Soil test.

(II) Ramp test equipment preparation

The ramp test device simulates the condition where the vehicle rolls sideways after it loses control when it rushes up a slope unilaterally. The relative angle between the primary guide table and the secondary rolling table is adjusted by the control console to meet the test requirements for different vehicle postures. The primary guide table fixed seat 8 is connected to the primary guide table surface 9 through the primary guide table hydraulic lifting frame 22 and the primary guide table telescopic bracket 11. The angle of the table surface is electrically controlled by the second control console to control the height adjustment of the primary guide table hydraulic lifting frame 22 to achieve the angle between the primary guide table surface 9 and the test ground. After reaching the angle required by the test, the primary guide table surface 9 is fixed to the primary guide table fixed seat 8 by the primary guide table telescopic bracket 11 through the movable hole. The secondary rolling table fixed seat 12 is connected to the primary guide table surface 9 through a rotating hinge, and the secondary rolling table hydraulic lifting frame 13 and the secondary rolling table telescopic bracket 14 are fixed by bolts. The second control console electrically controls and adjusts the height of the secondary tumbling platform hydraulic lifting frame 13 to achieve angle adjustment between the secondary tumbling platform fixing seat 12 and the primary guide platform table 9. After reaching the test required angle, the secondary tumbling platform is fixed by the secondary tumbling platform telescopic bracket 14. The secondary tumbling platform telescopic platform 15 is connected to the secondary tumbling platform fixing seat 12 through the telescopic bracket, and the length of the secondary tumbling platform telescopic platform 15 is changed by telescoping to meet the requirements of the vehicles 300 with different wheelbases to be tested.

(III) Test preparation

a) Positioning of the test vehicle and tooling: When fixing the ramp test device by the wheelbase A of the vehicle, the distance between the center line of the device and the center of the track must be 1/2A±10 (mm).

b) The test vehicle is confirmed to be dispatched, the on-board data acquisition instrument is set up normally, the high-speed camera is set up normally, the speed tester is set up normally, and the traction system 200 is confirmed to be normal.

c) The test matrix is based on Table 2 below and may be adjusted as needed to meet special operating conditions for reproducing a real traffic accident.

Table 2

Test No. Test speed (km/h) Guide platform angle Relative angle of tumbling table 1 50 15° 0° 2 50 30° 0° 3 50 45° 0° 4 50 15° 15° 5 50 15° 30° 6 50 15° 45°

In summary, the ramp rollover test device 120 and the test method thereof in the embodiment of the present invention realize the verification of the vehicle rollover condition caused by the rapid change of the vehicle body inclination angle after the wheels are affected by ground obstacles (for example, rushing up a slope unilaterally) when the car is traveling at high speed. The test device is simple in design, and the expected test effect and consistency are good. At the same time, the dynamic rollover condition test data is accumulated and used for the calibration of vehicle design, which improves the safety performance development capability of the whole vehicle, reduces the hidden dangers to personnel after a car rollover accident, and improves the independent capability of new technology research and development.

Please refer to Figure 6. In a certain embodiment, the rollover test device 10 also includes a ditch rollover test device 130. The test surface 101 is a downward slope surface. The ditch rollover test device 130 includes a second vehicle driving platform 16, a first-level sideslip table 17, a first-level sideslip table lifting frame 18, a second-level rollover table lifting frame 19, a second-level rollover table 20, a vehicle driving traction track and a third control console; wherein the horizontal level height of the second vehicle driving platform 16, the horizontal level height of the first-level sideslip table 17 and the horizontal level height of the second rollover table 20 decrease in sequence.

The second vehicle driving platform 16 is movably connected to the primary side sliding table 17, the primary side sliding table 17 is supported and fixed by the primary side sliding table lifting frame 18, the secondary rolling table 20 is movably connected to the primary side sliding table 17, and is supported and fixed by the secondary rolling table lifting frame 19. The third control console is electrically connected to the primary side sliding table lifting frame 18 and the secondary rolling table lifting frame 19 respectively.

The ditch rollover test device 130 in the embodiment of the present invention is also called a Ditch test device. The Ditch test device simulates the condition where the vehicle rolls sideways after losing control while rushing down a slope on one side. The angle between the primary side sliding table 17 and the secondary rollover table 20 is adjusted by the control console to meet the requirements of the test for different vehicle postures. The vehicle driving platform can use the existing separate heightening platform to increase the utilization rate of the test site.

The specific structure is as follows: the Ditch test device includes a second vehicle driving platform 16, a first-level sliding table 17, a first-level sliding table lifting frame 18, a second-level rolling table lifting frame 19, a second-level rolling table 20 and a third control console.

The primary side sliding table 17 is connected to the second vehicle driving platform 16 through a hinge, and the angle between the primary side sliding table 17 and the driving platform is changed by electrically controlling the height adjustment of the primary side rolling table lifting frame 18. The secondary rolling table 20 is connected to the primary side sliding table 17 through a hinge, and the angle between the secondary rolling table 20 and the primary side sliding table 17 is changed by electrically controlling the height adjustment of the secondary rolling table lifting frame 19, thereby providing different rolling speeds and rolling angles for the vehicle 300 to be tested, so that the vehicle 300 to be tested reaches a critical acceleration, so as to obtain the working condition test data of the vehicle 300 to be tested during driving and rolling, and meet the requirements of the test for different vehicle postures.

Therefore, when the rollover test device 10 is a ditch rollover test device 130 and the test surface 101 is a downward slope surface, the corresponding vehicle dynamic rollover test method is specifically as follows, and the method further includes the following steps:

S50 , according to a predetermined ditch working condition table, setting the angle between the second vehicle driving platform 16 and the primary side sliding surface 17 of the ditch rollover test device 130 , and setting the angle between the primary side sliding surface 17 and the secondary rollover surface 20 .

In a specific embodiment, the predetermined ditch working conditions are shown in Table 2.

Then step S20, accelerating the vehicle 300 to a predetermined test speed by the traction system 200 so that the vehicle 300 passes through the test surface 101, further includes the following steps:

S25. Accelerate the vehicle 300 to be tested, which is arranged on the vehicle driving traction track 21 of the ditch rollover test device 130, to a predetermined test speed through the traction system 200, so that the vehicle 300 to be tested passes through the primary side sliding surface 17 and the secondary rollover surface 20 in sequence along the vehicle driving traction track 21, and the lateral acceleration of the vehicle 300 to be tested reaches a critical acceleration.

Before the Ditch test begins, the following preparation steps are also included:

(I) Vehicle preparation

The whole vehicle preparation refers to the entire process of Soil test.

(II) Ditch test equipment preparation

The Ditch test device simulates the condition where the vehicle rolls sideways after losing control while rushing down a slope unilaterally. The angle between the primary sliding table 17 and the secondary rolling table 20 is adjusted by the control console to meet the test requirements for different vehicle postures. The second vehicle driving platform 16 can use the existing separate heightening platform to increase the utilization rate of the test site. The primary sliding table 17 is connected to the first vehicle driving platform 1 through a hinge, and the height adjustment of the primary rolling table lifting frame 18 is electrically controlled by the third control console to change the angle between the primary sliding table 17 and the second vehicle driving platform 16. The secondary rolling table 20 is connected to the primary sliding table 17 through a hinge, and the height adjustment of the secondary rolling table lifting frame 19 is electrically controlled by the third control console to achieve the angle change between the secondary rolling table 20 and the primary sliding table 17.

(III) Test preparation

a) Positioning of the test vehicle and tooling. The device is embedded in the test site. The runway in the test area is elevated. The angle between the vehicle driving traction track 21 and the side sliding table of the device is 15 degrees (to prevent the vehicle from directly rushing down the test device).

b) The test vehicle is confirmed to be dispatched, the on-board data acquisition instrument is set up normally, the high-speed camera is set up normally, the speed tester is set up normally, and the traction system 200 is confirmed to be normal.

c) The test matrix is based on Table 3 below and may be adjusted as needed to meet special operating conditions for reproducing a real traffic accident.

table 3

Test No. Test speed (km/h) Side sliding platform angle Relative angle of tumbling table 1 30 15° 35° 2 30 15° 40° 3 30 15° 45° 4 30 15° 50° 5 30 15° 55° 6 30 30° 35° 7 30 30° 40° 8 30 30° 45° 9 30 30° 50° 10 30 30° 55°

In summary, the ditch rollover test device 130 and the test method thereof in the embodiment of the present invention realize the verification of the vehicle rollover condition when the vehicle skids on a road with poor road conditions due to changes in the road slope (for example, rushing down a slope on one side). When the lateral acceleration of the vehicle body exceeds the limit, the vertical reverse force of the inner wheel of the vehicle is zero. The test device is simple in design, and the expected test effect and consistency are good. At the same time, the dynamic rollover condition test data is accumulated for use in the calibration of vehicle design, thereby improving the safety performance development capability of the entire vehicle, reducing the hidden dangers to personnel after a vehicle rollover accident, and improving the independent capability of new technology research and development.

Compared with the prior art, the vehicle dynamic rollover test equipment 100 in the embodiment of the present invention can simulate various rollover conditions in actual road conditions, and add a test verification method for the whole vehicle in the airbag ECU development process. Through the simulation of different working conditions, the relevant dynamic rollover working condition test data can be accumulated and used for the calibration of vehicle design, thereby improving the safety performance development capability of the whole vehicle, reducing the hidden dangers to personnel after a car rollover accident, and improving the independent ability of new technology research and development.

The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims (11)

1. A vehicle dynamic rollover test device, characterized in that it comprises a rollover test device, the rollover test device comprises a test surface, the test surface is one or more of a muddy surface, an upper slope surface and a lower slope surface, the test surface is used to provide different rollover speeds and rollover angles for the vehicle to be tested, so that the lateral acceleration of the vehicle to be tested reaches a critical acceleration; wherein the critical acceleration is the lateral acceleration of the vehicle to be tested calculated according to a vehicle rollover model; After the traction system accelerates the vehicle to be tested to a predetermined test speed, the vehicle to be tested passes through the test surface, so that the data acquisition device collects the working condition test data of the vehicle to be tested in real time during the driving and rolling process; wherein the working condition test data is used for the calibration of the vehicle design; Wherein, the vehicle rollover model includes: According to the vehicle's stable state, the sum of the torques at the contact points between the wheels on one side of the vehicle and the ground is taken as zero, and the following formula is obtained: After transformation through formula (1), we get: Where A is the wheelbase of the car, m is the mass of the car, _hg is the height of the car mass, _ay is the lateral acceleration, α is the road inclination slope, and _Fyi is the reverse force of the inner tire support; Formula (2) shows that as the lateral acceleration _ay increases, the reverse force _Fyi supported by the inner tire of the vehicle decreases accordingly. When the reverse force _Fyi supported by the inner tire decreases to zero, the vehicle cannot maintain balance in the roll plane and begins to roll over. The lateral acceleration _ay to which the vehicle is subjected is the critical acceleration When the rollover test device includes a mud and sand rollover test device and the test surface is a mud and sand surface, the mud and sand rollover test device includes a first vehicle driving platform, a vehicle rolling mud and sand area, a damping device, a first control console, a vehicle tire baffle and a driving platform mounting seat. The driving platform mounting seat is fixed to the side area of the first vehicle driving platform and is used to adjust the posture of the vehicle to be tested during movement. The vehicle tire baffle is fixed to the driving platform mounting seat. 2. The vehicle dynamic rollover test equipment according to claim 1, characterized in that the first vehicle driving platform is arranged opposite to the vehicle rollover mud and sand area, is used to carry the vehicle to be tested, and is fixedly connected to the traction system, and the first console is electrically connected to the traction system; The damping device includes a first damper and a second damper, wherein the first damper and the second damper are respectively fixed to a horizontal ground and are respectively used to decelerate the vehicle to be tested; wherein the buffering degree of the first damper is greater than the buffering degree of the second damper. 3 . The vehicle dynamic rollover test device according to claim 2 , wherein the first damper comprises a spring damper, and the second damper comprises a springless damper. 4. The vehicle dynamic rollover test equipment according to claim 2 is characterized in that the mud and sand rollover test device also includes a driving platform deceleration baffle, which is fixed on both sides of the first vehicle driving platform and is used to decelerate the vehicle to be tested. 5. The vehicle dynamic rollover test equipment according to any one of claims 1 to 4, characterized in that when the rollover test device includes a ramp rollover test device and the test surface is an upper slope surface, the ramp rollover test device includes a primary guide platform fixing seat, a primary guide platform surface, a primary guide platform hydraulic lifting frame, a primary guide platform telescopic bracket, a secondary rollover platform fixing seat, a secondary rollover platform hydraulic lifting frame, a secondary rollover platform telescopic bracket, a secondary rollover platform surface telescopic platform and a second control console; The first-level guide platform fixing seat is connected to the first-level guide platform table through the first-level guide platform hydraulic lifting frame and the first-level guide platform telescopic bracket, and the end surface of the first-level guide platform fixing seat is movably connected to the end surface of the first-level guide platform table; The secondary rolling platform fixing seat is movably connected to the primary guide platform surface, and the secondary rolling platform hydraulic lifting frame and the secondary rolling platform telescopic bracket are respectively fixed to the secondary rolling platform fixing seat; The secondary tumbling table telescopic platform is connected to the secondary tumbling table fixed seat and is fixed to the secondary tumbling table telescopic bracket by a diagonal brace structure; The second control console is electrically connected to the first-level guide platform hydraulic lifting frame and the second-level tumbling platform hydraulic lifting frame respectively. 6. The vehicle dynamic rollover test equipment according to any one of claims 1 to 4, characterized in that when the rollover test device includes a ditch rollover test device and the test surface is a downward slope surface, the ditch rollover test device includes a second vehicle driving platform, a first-level sideslip table, a first-level sideslip table lifting frame, a second-level rollover table lifting frame, a second-level rollover table, a vehicle driving traction track and a third control console; wherein the horizontal level height of the second vehicle driving platform, the horizontal level height of the first-level sideslip table and the horizontal level height of the second-level rollover table decrease in sequence; The second vehicle driving platform is movably connected to the first-level sideslip table, the first-level sideslip table is supported and fixed by the first-level sideslip table lifting frame, and the second-level rolling table is movably connected to the first-level sideslip table and supported and fixed by the second-level rolling table lifting frame; The third control console is electrically connected to the first-level sliding table lifting frame and the second-level rolling table lifting frame respectively. 7. A vehicle dynamic rollover test method, characterized in that it is applied to the vehicle dynamic rollover test equipment according to any one of claims 1 to 6, and the method comprises: Establishing a vehicle rollover model, and calculating the critical acceleration of the vehicle to be tested when it rolls over according to the vehicle rollover model; wherein the critical acceleration is the lateral acceleration to which the vehicle to be tested is subjected when it rolls over; Accelerating the vehicle to be tested to a predetermined test speed through a traction system, and making the vehicle to be tested pass through the test surface; wherein the test surface is used to provide different rolling speeds and rolling angles for the vehicle to be tested, so that the lateral acceleration of the vehicle to be tested reaches the critical acceleration; The working condition test data of the vehicle to be tested during driving and rolling are collected in real time by a data collection device; wherein the working condition test data is used for calibration of vehicle design; Wherein, the vehicle rollover model includes: According to the vehicle's stable state, the sum of the torques at the contact points between the wheels on one side of the vehicle and the ground is taken as zero, and the following formula is obtained: After transformation through formula (1), we get: Where A is the wheelbase of the car, m is the mass of the car, _hg is the height of the car mass, _ay is the lateral acceleration, α is the road inclination slope, and _Fyi is the reverse force of the inner tire support; Formula (2) shows that as the lateral acceleration _ay increases, the reverse force _Fyi supported by the inner tire of the vehicle decreases accordingly. When the reverse force _Fyi supported by the inner tire decreases to zero, the vehicle cannot maintain balance in the roll plane and begins to roll over. The lateral acceleration _ay to which the vehicle is subjected is the critical acceleration 8. The vehicle dynamic rollover test method according to claim 7 is characterized in that, when the rollover test device includes a mud and sand rollover test device and the test surface is a mud and sand surface, the mud and sand rollover test device includes a first vehicle driving platform, a vehicle rolling mud and sand area, a damping device and a first control console; the first vehicle driving platform is arranged opposite to the vehicle rolling mud and sand area, is used to carry the vehicle to be tested, and is fixedly connected to the traction system; the damping device includes a first damper and a second damper, the first damper and the second damper are respectively fixed to the horizontal ground, and are respectively used to decelerate the vehicle to be tested; wherein the buffering degree of the first damper is greater than the buffering degree of the second damper; the method of accelerating the vehicle to be tested to a predetermined test speed through the traction system and making the vehicle to be tested pass through the test surface includes: Accelerating the first vehicle driving platform on which the vehicle to be tested is placed on the mud and sand rolling test device to a predetermined test speed through a traction system; The vehicle to be tested is decelerated according to a predetermined deceleration curve by the first damper and the second damper of the mud and sand rolling test device respectively, so that the vehicle to be tested passes through the vehicle rolling mud and sand area from the first vehicle driving platform, and the lateral acceleration of the vehicle to be tested reaches the critical acceleration. 9. The vehicle dynamic rollover test method according to claim 8, characterized in that after the first vehicle driving platform on which the vehicle to be tested is placed on the mud and sand rollover test device is accelerated to a predetermined test speed by the traction system, the method further comprises: The vehicle to be tested is controlled to pass through the vehicle tire baffle on the first vehicle driving platform, so that the vehicle tire baffle of the mud and sand rolling test device adjusts the rolling posture of the vehicle to be tested during movement, and the rolling posture includes a rolling speed and a rolling angle. 10. The vehicle dynamic rollover test method according to claim 7 is characterized in that when the rollover test device includes a ramp rollover test device and the test surface is an upward slope surface, the ramp rollover test device includes a primary guide platform fixing seat, a primary guide platform surface, a primary guide platform hydraulic lifting frame, a primary guide platform telescopic bracket, a secondary rollover platform fixing seat, a secondary rollover platform hydraulic lifting frame, a secondary rollover platform telescopic bracket, a secondary rollover platform telescopic platform and a second control console; the primary guide platform fixing seat is connected to the primary guide platform through the primary guide platform hydraulic lifting frame and the primary guide platform telescopic bracket The guide table is connected to the table top, and the end surface of the first-level guide table fixing seat is movably connected to the end surface of the first-level guide table table top; the second-level rolling table fixing seat is movably connected to the first-level guide table table top, and the second-level rolling table hydraulic lifting frame and the second-level rolling table telescopic bracket are respectively fixed to the second-level rolling table fixing seat; the second-level rolling table telescopic platform is connected to the second-level rolling table fixing seat, and is fixed to the second-level rolling table telescopic bracket by a diagonal brace structure; the second control console is electrically connected to the first-level guide table hydraulic lifting frame and the second-level rolling table hydraulic lifting frame respectively; the method also includes: According to a predetermined ramp working condition table, the angle between the first-level guide table surface of the ramp tumbling test device and the horizontal ground is set, the angle between the first-level guide table surface and the second-level tumbling table fixing seat is set, and the length of the telescopic table of the second-level tumbling table surface is set; Then the method of accelerating the vehicle to be tested to a predetermined test speed through the traction system and making the vehicle to be tested pass through the test surface further includes: The vehicle to be tested is accelerated to a predetermined test speed by a traction system, so that the vehicle to be tested passes through the first-level guide platform, the platform of the second-level rolling platform fixing seat and the second-level rolling platform telescopic platform in sequence, and the lateral acceleration of the vehicle to be tested reaches the critical acceleration. 11. The vehicle dynamic rollover test method according to claim 7 is characterized in that when the rollover test device includes a ditch rollover test device and the test surface is a downward slope surface, the ditch rollover test device includes a second vehicle driving platform, a first-level sideslip table, a first-level sideslip table lifting frame, a second-level rollover table lifting frame, a second-level rollover table, a vehicle driving traction track and a third control console; the horizontal level height of the second vehicle driving platform, the horizontal level height of the first-level sideslip table and the horizontal level height of the second-level rollover table decrease in sequence; the second vehicle driving platform is movably connected to the first-level sideslip table, the first-level sideslip table is supported and fixed by the first-level sideslip table lifting frame, the second-level rollover table is movably connected to the first-level sideslip table and supported and fixed by the second-level rollover table lifting frame; the third control console is electrically connected to the first-level sideslip table lifting frame and the second-level rollover table lifting frame respectively; the method further includes: According to a predetermined ditch working condition table, setting the angle between the second vehicle driving platform and the primary side sliding surface of the ditch rollover test device, and setting the angle between the primary side sliding surface and the secondary rollover surface; Then the method of accelerating the vehicle to be tested to a predetermined test speed through a traction system and making the vehicle to be tested pass through the test surface further includes: The vehicle to be tested, which is arranged on the vehicle driving traction track of the ditch rollover test device, is accelerated to a predetermined test speed through a traction system, so that the vehicle to be tested passes through the primary side sliding surface and the secondary rollover surface in sequence along the vehicle driving traction track, and the lateral acceleration of the vehicle to be tested reaches the critical acceleration.