Device and method for measuring vehicle roll angle and ground clearance of anti-roll bracket

Abstract

The application provides a device and method for measuring the side inclination angle and the ground clearance of a rollover prevention support, comprising a rollover prevention support; the rollover prevention support is in a long rectangular shape, the rollover prevention support is fixed on the bumper of a vehicle, the length of the rollover prevention support is longer than the length of the bumper of the vehicle, and the rollover prevention support is parallel to the ground; a first laser range finder and a second laser range finder are arranged at the two ends of the rollover prevention support, respectively. The device for measuring the side inclination angle and the ground clearance of the rollover prevention support can be used to dynamically and real-timely measure the ground clearance of the rollover prevention support and the side inclination angle of the vehicle without being restricted by the type of the vehicle under the road condition, and has the characteristics of accurate test effect and high automation degree.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of road test of whole vehicle, and particularly relates to a device and method for measuring vehicle roll angle and anti-rollover bracket ground clearance. BACKGROUND

[0002] With the rapid development of China's automobile market, the driving speed of vehicles and the density of vehicles on roads are continuously increasing, and the traffic accidents caused by out-of-control vehicles are showing an increasing trend year by year. According to the statistics of the US NHTSA, although only 3% of traffic accidents are related to rollover, the fatality rate is as high as 33%, and the stability of passenger vehicles has attracted widespread attention from consumers and government departments. At present, GTR8, EU ECE R140, US FMVSS126 and China GB / T 30677-2014 have all formulated test methods and evaluation indexes for testing the electronic stability system (ESC) of vehicles. The most dangerous situation of vehicles in an unstable state is that the vehicle rolls seriously due to severe vehicle roll, and therefore the US US-CNAP formulates a more stringent fishhook test to evaluate the anti-rollover ability of vehicles. The most important index for evaluating the anti-rollover stability of vehicles in the test is whether the height of the wheel from the ground exceeds 50.8mm under the specified test speed and steering wheel input. However, in the test process, the anti-rollover bracket acts as a protective device, and when it touches the ground and the height of the wheel from the ground does not reach 50.8mm, it needs to be raised to the specified height. The judgment of whether the anti-rollover bracket touches the ground is based on human senses such as visual observation and impact feeling, and lacks accurate data support for judgment.

[0003] In the prior art, a patent with publication number CN204575049U proposes a new vehicle body roll angle measuring device. When the vehicle body rolls, the height difference between the first bracket and the third bracket is obtained by a first pull wire sensor, the height difference between the second bracket and the fourth bracket is obtained by a second pull wire sensor, and the tangent value of the roll angle is obtained by dividing the difference between the two obtained height differences by the lateral distance between the pull wire connection position of the first bracket and the pull wire connection position of the second bracket. The technical solution disclosed in this patent is only for the roll angle of the vehicle when the wheel is not off the ground, and cannot measure the roll angle of the vehicle when the wheel is off the ground. It cannot meet the real-time road test requirements of the roll angle of the vehicle when the wheel is off the ground, and cannot satisfy the implementation of the fishhook test and the quantitative judgment of the stability of the vehicle in an unstable state. SUMMARY

[0004] Therefore, the present application aims to provide a device and method for measuring vehicle roll angle and anti-rollover bracket ground clearance, which can dynamically and real-timely measure the anti-rollover bracket ground clearance and the vehicle roll angle in a road state without being restricted by the type of vehicle, and has the characteristics of accurate test effect and high automation degree.

[0005] To achieve the above object, the technical scheme of the present application is as follows:

[0006] The device for measuring the vehicle roll angle and the anti-rollover support ground clearance comprises an anti-rollover support. The anti-rollover support is in a long rectangular shape, is fixed on the automobile bumper, has a length longer than that of the automobile bumper, and is parallel to the ground. First and second laser range finders are arranged at the two ends of the anti-rollover support respectively. The laser light path directions of the first and second laser range finders are both perpendicular to the anti-rollover support. The signal output ends of the first and second laser range finders are connected with a data acquisition instrument, and the data acquisition instrument is connected with a mobile computer.

[0007] Further, the data acquisition instrument is a DEWE-43 type data acquisition instrument.

[0008] Further, the first and second laser range finders are both Banner LE550 type range finders.

[0009] Further, the anti-rollover support is a 6AL-4V titanium processing support.

[0010] The method for measuring the vehicle roll angle and the anti-rollover support ground clearance uses the above device for measuring the vehicle roll angle and the anti-rollover support ground clearance, and comprises the following steps.

[0011] Step 1: After the vehicle is parked for 1 hour, inflate all the tires of the vehicle to the recommended tire pressure P corresponding to the test load.

[0012] Step 2: Drive the vehicle into the test site for testing. The automatic steering robot SR60 is used to realize the automatic steering operation of the steering wheel. The test is carried out at a specified vehicle speed. The first laser range finder is fixed at the position E of the anti-rollover support, the second laser range finder is fixed at the position C of the anti-rollover support, the midpoint of the line connecting the points E and C is the point D, the grounding point of the anti-rollover support on the side of the first laser range finder is the point F, and the grounding point of the anti-rollover support on the side of the second laser range finder is the point B. The points F, E, D, C and B are on the same straight line. The distance o between the points F and E, the distance k between the points E and D, the distance j between the points D and C, and the distance i between the points C and B are determined.

[0013] Step 3: Based on the values obtained in step 2, the vehicle roll angle β and the anti-rollover support ground clearance value, including the anti-rollover support F point ground clearance L1 and the anti-rollover support B point ground clearance L2, are calculated.

[0014]

[0015]

[0016]

[0017] H1+H2=H, wherein, H1 is the collection data of the first laser range finder; H2 is the collection data of the second laser range finder.

[0018] Compared with the prior art, the device and method for measuring the vehicle roll angle and the ground clearance of the anti-rollover support have the following advantages:

[0019] First, the ground clearance of the anti-rollover support and the vehicle roll angle can be monitored in real time during vehicle driving, and accurate data can be provided for judgment.

[0020] Second, it is not constrained by whether the wheels are off the ground, and is suitable for measuring the ground clearance of the anti-rollover support and the vehicle roll angle when the wheels are off the ground and when the wheels are not off the ground, and has strong universality.

[0021] Third, the vehicle driving state is not changed, and no unconventional operation is required. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of these drawings illustrate the embodiments of this application and, together with their description, serve to explain the application without imposing undue limitation thereto.

[0023] In the drawings:

[0024] Figure 1 The device and method for measuring the vehicle roll angle and the ground clearance of the anti-rollover support according to the embodiments of the application are shown in the accompanying drawings.

[0025] Explanation of reference signs:

[0026] 1 - first laser range finder; 2 - second laser range finder; 3 - anti-rollover support; 4 - data acquisition instrument; 5 - mobile computer. DETAILED DESCRIPTION

[0027] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict.

[0028] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and not indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation of the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0029] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0030] The present application will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0031] As shown in Figure 1 The device for measuring the roll angle of the vehicle and the ground clearance of the anti-rollover support includes an anti-rollover support 3. The anti-rollover support 3 is long rectangular in shape, the anti-rollover support 3 is fixed on the bumper of the car, the length of the anti-rollover support 3 is longer than the length of the bumper of the car, and the anti-rollover support 3 is parallel to the ground. A first laser range finder 1 and a second laser range finder 2 are arranged at both ends of the anti-rollover support 3, respectively. The laser light path direction of the first laser range finder 1 and the laser light path direction of the second laser range finder 2 are both perpendicular to the anti-rollover support 3. The signal output end of the first laser range finder 1 and the signal output end of the second laser range finder 2 are both connected with a data acquisition instrument 4, and the data acquisition instrument 4 is connected with a mobile computer 5.

[0032] As shown in Figure 1 The data acquisition instrument 4 is a DEWE-43 type data acquisition instrument.

[0033] As shown in Figure 1 The first laser range finder 1 and the second laser range finder 2 are both Banner LE550 type range finders.

[0034] As shown in Figure 1As shown, the anti-rollover bracket 3 is a 6AL-4V titanium processing bracket.

[0035] The method for measuring the vehicle roll angle and the anti-rollover bracket ground clearance uses the above-mentioned device for measuring the vehicle roll angle and the anti-rollover bracket ground clearance, and comprises the following steps:

[0036] Step 1: After the vehicle is parked for 1 hour, inflate all the tires of the vehicle to the recommended tire pressure P corresponding to the test load;

[0037] Step 2: Drive the vehicle into the test site for testing, realize automatic steering operation of the steering wheel through the automatic steering robot SR60, test at a specified vehicle speed, set the first laser range finder 1 fixed at the position E of the anti-rollover bracket 3, the second laser range finder 2 fixed at the position C of the anti-rollover bracket 3, the midpoint of the line connecting the E point and the C point is the D point, set the touch point of the anti-rollover bracket 3 on one side of the first laser range finder 1 as the F point, and set the touch point of the anti-rollover bracket 3 on one side of the second laser range finder 2 as the B point; the F point, the E point, the D point, the C point and the B point are on the same straight line, determine the distance o between the F point and the E point, the distance k between the E point and the D point, the distance j between the D point and the C point, and the distance i between the C point and the B point;

[0038] Step 3: Based on the values obtained in step 2, calculate the vehicle roll angle β and the anti-rollover bracket ground clearance value, including the F point of the anti-rollover bracket 3 ground clearance L1 and the B point of the anti-rollover bracket 3 ground clearance L2:

[0039]

[0040]

[0041]

[0042] H1 is the collection data of the first laser range finder 1; H2 is the collection data of the second laser range finder 2.

[0043] The above is only a preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for measuring the vehicle roll angle and the ground clearance of the anti-rollover bracket, characterized in that: A device for measuring the vehicle roll angle and the height of the anti-rollover bracket from the ground is used. The device includes an anti-rollover bracket (3). The anti-rollover bracket (3) is rectangular in shape and is fixed to the car bumper. The length of the anti-rollover bracket (3) is longer than the length of the car bumper. The anti-rollover bracket (3) is parallel to the ground. A first laser rangefinder (1) and a second laser rangefinder (2) are respectively installed at both ends of the anti-rollover bracket (3). The laser beam direction of the first laser rangefinder (1) and the laser beam direction of the second laser rangefinder (2) are both perpendicular to the anti-rollover bracket (3). The signal output terminals of the first laser rangefinder (1) and the second laser rangefinder (2) are both connected to a data acquisition device (4). The data acquisition device (4) is connected to a mobile computer (5). The device for measuring the vehicle roll angle and the height of the anti-rollover bracket from the ground is applicable to measuring the height of the anti-rollover bracket from the ground and the vehicle roll angle when the wheels are off the ground and when the wheels are not off the ground. The methods include: Step 1: After the vehicle has been stationary for 1 hour, inflate all tires to the recommended tire pressure P corresponding to the test load. Step 2: Drive the vehicle into the test site for testing. The automatic steering operation of the steering wheel is realized by the automatic steering robot SR60. The test is carried out at the specified vehicle speed. The position of the first laser rangefinder (1) fixed on the anti-rollover bracket (3) is set as point E, the position of the second laser rangefinder (2) fixed on the anti-rollover bracket (3) is set as point C, the midpoint of the line connecting point E and point C is set as point D, the contact point of the anti-rollover bracket (3) on the side of the first laser rangefinder (1) is set as point F, and the contact point of the anti-rollover bracket (3) on the side of the second laser rangefinder (2) is set as point B. Points F, E, D, C and B are on the same straight line. Determine the distance o between point F and point E, the distance k between point E and point D, the distance j between point D and point C, and the distance i between point C and point B. Step 3: Based on the values ​​obtained in Step 2, calculate the vehicle roll angle β; the ground clearance value of the anti-rollover bracket, including the ground clearance L1 of point F of the anti-rollover bracket (3) and the ground clearance L2 of point B of the anti-rollover bracket (3): H1 is the data collected by the first laser rangefinder (1); H2 is the data collected by the second laser rangefinder (2).

2. The method for measuring the vehicle roll angle and the ground clearance of the anti-rollover bracket according to claim 1, characterized in that: The data acquisition instrument (4) is a DEWE-43 data acquisition instrument, and the first laser rangefinder (1) and the second laser rangefinder (2) are both Banner LE550 rangefinders; the anti-rollover bracket (3) is a 6AL-4V titanium processing bracket.

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