CN113884313B - Test evaluation method for trailer sway - Google Patents
Test evaluation method for trailer sway Download PDFInfo
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- CN113884313B CN113884313B CN202111166671.1A CN202111166671A CN113884313B CN 113884313 B CN113884313 B CN 113884313B CN 202111166671 A CN202111166671 A CN 202111166671A CN 113884313 B CN113884313 B CN 113884313B
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000011156 evaluation Methods 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000010998 test method Methods 0.000 claims abstract description 7
- 230000001133 acceleration Effects 0.000 claims description 20
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000011056 performance test Methods 0.000 claims description 3
- 230000000881 depressing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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Abstract
The invention relates to a test and evaluation method for trailer sway, which comprises the following steps: s1, connecting a trailer to a tractor, and respectively performing subsequent tests when the trailer is in a state that the mass center is forward, the mass center is center and the mass center is backward; s2, testing critical vehicle speed of straight running working conditions; s3, performing a linear driving condition TSC intervention vehicle speed test; s4, testing the steering pulse working condition; s5, testing the working condition of the brake-before-steering pulse; s6, testing the working conditions of steering pulse and braking; s7, testing the TSC performance of the curve driving working condition; s8, judging the easy swinging degree of the trailer when the center of mass is located in front, the center of mass is located in the back, and determining the highest stable vehicle speed. The invention can find out the critical working condition of the vehicle after the trailer is carried, can determine the relation between the barycenter position of the trailer and the easy swinging degree, can determine the highest stable vehicle speed, can provide a reference for the highest safe running vehicle speed of a user in the actual use process, and avoids accidents.
Description
Technical Field
The invention relates to a trailer, in particular to a test and evaluation method for trailer sway.
Background
When a car with a trailer (such as a pickup truck drags a motor home) runs at a high speed on a road, the trailer swings left and right due to factors such as steering, braking and uneven road surface, and the main car swings after the swing amplitude is increased, so that the car is out of control and accidents occur; at present, no corresponding evaluation method exists, and full and effective evaluation on the vehicle type with the trailer is not allowed in the design stage of the vehicle.
Disclosure of Invention
The invention aims to provide a test and evaluation method for trailer sway, which is used for fully and effectively evaluating the vehicle type with the trailer.
The invention relates to a test and evaluation method for trailer sway, which comprises the following steps:
s1, preparing a trailer and a tractor with a TSC function at a test site, connecting the trailer to the tractor, and respectively carrying out subsequent tests in a state that the trailer is positioned in front of the center of mass, in the center of mass and in the rear of the center of mass, and detecting and recording the vehicle speed, the steering wheel angle, the lateral acceleration of the center of mass of the trailer and the swing condition of the trailer in the test process;
s2, testing critical vehicle speed of straight running working conditions: accelerating the tractor to 60km/h, keeping the speed of the vehicle for 10 seconds, checking whether the trailer swings, if the trailer does not swing, increasing the speed of the tractor by 10km/h, then testing again, and repeating the test until the trailer swings, and recording that the speed of the vehicle is V when the trailer swings 1 ；
S3, performing intervention vehicle speed test on TSC under straight running working condition, and accelerating the tractor to V 1 The above 5km/h stably runs, whether the TSC intervenes in work is checked, if the TSC does not intervene in work, the speed of the tractor is increased by 5km/h, the test is performed again, and the test is repeated until the TSC intervenes in work, and the speed of the TSC during the intervention work is recorded as V 2 ；
S4, testing the steering pulse working condition, wherein the tractor accelerates to 60km/h and stably runs, gradually inputting steering wheel rotation angle until the vehicle generates pulse steering of 0.4g lateral acceleration, if the TSC does not intervene in work, the speed of the tractor increases by 15km/h, testing again, and reciprocating in this way until the TSC intervenes in work, and recording that the speed of the TSC in the intervention work is V 3 If the speed of the tractor increases to 105km/h and 0.9 x v 1 If the TSC remains unintermittent at the smaller value of (2) then recording 105km/h and 0.9 v 1 The smaller value of V 3 ；
S5, testing the working condition of the pulse of braking and steering, namely, increasing the speed of the tractor to 10km/h above the tested speed and rapidly pressing a brake pedal to enable the tractor and the trailer to generate 0.25g of deceleration, gradually inputting steering pulse to enable the trailer to generate 0.4g of lateral acceleration, and testing the speed of the vehicle to be V 1 And V 3 Is a smaller value of (2);
s6, working conditions of steering pulse and brakingTesting, namely after the speed of the tractor is increased to the tested speed, stabilizing the speed, gradually inputting steering pulse to enable the trailer to generate pulse steering of 0.4g lateral acceleration, and then rapidly depressing a brake pedal to enable the vehicle to generate 0.25 or 0.35g braking deceleration, wherein the tested speed is V 1 And V 3 Is a smaller value of (2);
s7, performing performance test on a curve running condition TSC, after the speed of the tractor is increased to the test speed, stabilizing the speed, gradually inputting steering pulse to enable the trailer to generate 0.4g lateral acceleration, and after TSC intervention work, smoothly inputting steering to enable the trailer to generate 0.4g lateral acceleration; the test vehicle speed is V 1 And V 3 Is a smaller value of (2);
s8, comparing test results under various working conditions when the trailer is positioned in front of the mass center, in the center of the mass center and in the rear of the mass center, and judging the easy swinging degree when the trailer is positioned in front of the mass center, in the center of the mass center and in the rear of the mass center.
Further, the minimum speed of the trailer, which is not out of control and folded in swing under various working conditions when the trailer is positioned in front of the center of mass, in the center of mass and behind the center of mass, is compared to be the highest safe vehicle speed.
Further, in S1, when the trailer is positioned with the centroid thereof being forward as viewed in the front-rear direction, the centroid of the trailer is positioned on the front side of the trailer axle; when the trailer is positioned near the center of mass, the mass center of the trailer is positioned at the axle of the trailer; when the trailer is positioned with the center of mass rearward, the center of mass of the trailer is positioned rearward of the trailer axle.
The invention can find the critical working condition of the vehicle after the trailer is carried, can determine the relation between the barycenter position of the trailer and the easy swinging degree, can determine the highest stable vehicle speed, can provide reference for the highest safe running vehicle speed of a user in the actual use process, and avoids accidents.
Drawings
FIG. 1 is a schematic illustration of a test trailer loading center of mass location;
FIG. 2 is a pulse steering input strategy diagram;
fig. 3 shows the test results of a vehicle type towing a 1.5t trailer.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention provides a test and evaluation method for trailer sway, which comprises the following steps:
s1, preparing a trailer and a tractor with a TSC function at a test site, connecting the trailer to the tractor, and respectively carrying out subsequent tests in a state that the trailer is positioned in front of the center of mass, in the center of mass and in the rear of the center of mass, and detecting and recording the vehicle speed, the steering wheel angle, the lateral acceleration of the center of mass of the trailer and the swing condition of the trailer in the test process;
s2, testing critical vehicle speed of straight running working conditions: accelerating the tractor to 60km/h, keeping the speed of the vehicle for 10 seconds, checking whether the trailer swings, if the trailer does not swing, increasing the speed of the tractor by 10km/h, then testing again, and repeating the test until the trailer swings, and recording that the speed of the vehicle is V when the trailer swings 1 ；
S3, performing intervention vehicle speed test on TSC under straight running working condition, and accelerating the tractor to V 1 The above 5km/h stably runs, whether the TSC intervenes in work is checked, if the TSC does not intervene in work, the speed of the tractor is increased by 5km/h, the test is performed again, and the test is repeated until the TSC intervenes in work, and the speed of the TSC during the intervention work is recorded as V 2 The method comprises the steps of carrying out a first treatment on the surface of the In S3, the judgment requires that the TSC should intervene in three periods of trailer sway; after the TSC is activated, trailer swing converges in time; the tractor and trailer should not deviate from one lane; the tractors and trailers cannot be out of control or folded;
s4, testing the steering pulse working condition, wherein the tractor accelerates to 60km/h and stably runs, gradually inputting steering wheel rotation angle until the vehicle generates pulse steering of 0.4g lateral acceleration, if the TSC does not intervene in work, the speed of the tractor increases by 15km/h, testing again, and reciprocating in this way until the TSC intervenes in work, and recording that the speed of the TSC in the intervention work is V 3 If the speed of the tractor increases to 105km/h and 0.9 x v 1 If the TSC remains unintermittent at the smaller value of (2) then recording 105km/h and 0.9 v 1 The smaller value of V 3 The method comprises the steps of carrying out a first treatment on the surface of the In S4, the judgment requires that the TSC should intervene in three periods of trailer sway; after the TSC is activated, trailer swing converges in time; tractor and trailer should not be biasedLeaving one lane; the tractors and trailers cannot be out of control or folded;
s5, testing the working condition of the pulse of braking and steering, namely, increasing the speed of the tractor to 10km/h above the tested speed and rapidly pressing a brake pedal to enable the tractor and the trailer to generate 0.25g of deceleration, gradually inputting steering pulse to enable the trailer to generate 0.4g of lateral acceleration, and testing the speed of the vehicle to be V 1 And V 3 Is a smaller value of (2); in S5, the judgment requires that the TSC should intervene in three periods of trailer sway; after the TSC is activated, trailer swing converges in time; the tractor and trailer should not deviate from one lane; the tractors and trailers cannot be out of control or folded;
s6, testing the working condition of steering pulse and braking, wherein the speed of the tractor is increased to the tested speed, then the tractor is stabilized, the tractor is driven at the speed, the steering pulse is gradually input, the trailer generates a pulse steering with 0.4g of lateral acceleration, the brake pedal is rapidly pressed down, the vehicle generates 0.25g or 0.35g of braking deceleration, and the tested speed is V 1 And V 3 Is a smaller value of (2); in S6, the judgment requires that the TSC should intervene in three periods of trailer sway; after the TSC is activated, trailer swing converges in time; the tractor and the trailer should not deviate from one lane, and the tractor and the trailer cannot be out of control or folded;
s7, performing performance test on a curve running condition TSC, after the speed of the tractor is increased to the test speed, stabilizing the speed, gradually inputting steering pulse to enable the trailer to generate 0.4g lateral acceleration, and after TSC intervention work, smoothly inputting steering to enable the trailer to generate 0.4g lateral acceleration; the test vehicle speed is V 1 And V 3 Is a smaller value of (2); in S7, judging that TSC control is required to be insensitive to intervention; the tractors and trailers cannot be out of control or folded;
s8, comparing test results under various working conditions when the trailer is positioned in front of the mass center, in the center of the mass center and in the rear of the mass center, and judging the easy swinging degree when the trailer is positioned in front of the mass center, in the center of the mass center and in the rear of the mass center.
In this embodiment, the minimum speed at which the trailer does not swing out of control and fold under each operating condition is compared to the highest safe vehicle speed when the trailer is forward of the center of mass, centered on the center of mass, and rearward of the center of mass.
In this embodiment, in S1, the center of mass of the trailer is on the front side of the trailer axle when the trailer is positioned in front of the center of mass as viewed in the front-rear direction; when the trailer is positioned near the center of mass, the mass center of the trailer is positioned at the axle of the trailer; when the trailer is positioned with the center of mass rearward, the center of mass of the trailer is positioned rearward of the trailer axle. It should be noted that when loading a tractor to place the center of mass of the trailer, the trailer load cannot exceed a specified maximum load, the weight change at the junction of the tractor and trailer cannot exceed 10%, otherwise the tractor, trailer axle are vulnerable.
In this embodiment, during testing of each condition, it should be ensured that the tractor and trailer do not deviate from the lane, the tractor and trailer cannot run away or fold due to sway, and the trailer sway record should include whether the trailer sway, whether the trailer converges after sway, whether the TSC is involved in operation, and whether the TSC is involved in operation sway.
In the present embodiment, the process of gradually inputting the steering wheel angle until the vehicle makes a pulse turn of 0.4g lateral acceleration is shown in fig. 2, in which δmax: the steering pulse input should produce a trailer lateral acceleration of 0.4 + -0.05 g steering wheel angle; t is t 0 : after the steering input is started, the steering wheel angle increase is firstly increased to 10% of the pulse angle amplitude; t is t 1 : the steering wheel angle is reduced to 10% of the pulse angle amplitude for the first time; t is t 2 Time when the steering wheel angle remains within a tolerance of + -4 deg; t is t 1 -t 0 ≤0.5s；t 2 -t 1 ≤1s。
As shown in fig. 3, test results of a certain vehicle type (with TSC function) traction 1.5T trailer under different mass center distribution under different working conditions respectively show that the results indicate that the trailer is easy to swing and ordered: the centroid is back > centroid is center > centroid is front; and the highest stable vehicle speed allowed by the vehicle type for towing the 1.5t trailer is 100km/h.
Claims (3)
1. The test and evaluation method for trailer sway is characterized by comprising the following steps of:
s1, preparing a trailer and a tractor with a TSC function at a test site, connecting the trailer to the tractor, and respectively carrying out subsequent tests in a state that the trailer is positioned in front of the center of mass, in the center of mass and in the rear of the center of mass, and detecting and recording the vehicle speed, the steering wheel angle, the lateral acceleration of the center of mass of the trailer and the swing condition of the trailer in the test process; trailer sway conditions include whether the trailer is swayed, whether the trailer is converged after swaying, whether the TSC intervenes in work, and whether the TSC intervenes in work and sways;
s2, testing critical vehicle speed of straight running working conditions: accelerating the tractor to 60km/h, keeping the speed of the vehicle for 10 seconds, checking whether the trailer swings, if the trailer does not swing, increasing the speed of the tractor by 10km/h, then testing again, and repeating the test until the trailer swings, and recording the speed of the trailer as V1 when the trailer swings;
s3, testing the intervention speed of the TSC under the straight running working condition, accelerating the tractor to 5km/h above V1 to stably run, checking whether the TSC is in intervention work or not, if the TSC is not in intervention work, testing again by increasing the speed of the tractor by 5km/h, and reciprocating in this way until the TSC is in intervention work, and recording the speed of the TSC when the TSC is in intervention work as V2;
s4, testing a steering pulse working condition, wherein the tractor accelerates to 60km/h and stably runs, gradually inputting steering wheel rotation angle until the vehicle generates pulse steering of 0.4g lateral acceleration, if TSC does not intervene in work, the speed of the tractor increases by 15km/h, testing again, and reciprocating in this way until the TSC intervenes in work, recording the speed of the TSC in work as V3, and if the speed of the tractor increases to 105km/h and a smaller value of 0.9 x V1, recording the TSC in work as V3, wherein the smaller value of 105km/h and 0.9 x V1 is still not intervened;
s5, testing the working condition of a brake-before-steering pulse, wherein the speed of the tractor is increased to 10km/h above the tested speed and the brake pedal is quickly stepped down, so that the tractor and the trailer generate 0.25g of deceleration, steering pulse is gradually input, the trailer generates 0.4g of lateral acceleration, and the tested speed is smaller than the V1 and V3;
s6, testing the working condition of steering pulse and braking, wherein the speed of the tractor is increased to the tested speed, then the tractor runs at a stable speed, the steering pulse is gradually input, the trailer generates a pulse steering of 0.4g lateral acceleration, then the brake pedal is rapidly stepped down, the vehicle generates 0.25 or 0.35g braking deceleration, and the tested speed is smaller than the V1 and V3;
s7, performing performance test on a curve running condition TSC, after the speed of the tractor is increased to the test speed, stabilizing the speed, gradually inputting steering pulse to enable the trailer to generate 0.4g lateral acceleration, and after TSC intervention work, smoothly inputting steering to enable the trailer to generate 0.4g lateral acceleration; the test vehicle speed is smaller values of V1 and V3;
s8, comparing test results under various working conditions when the trailer is positioned in front of the mass center, in the center of the mass center and in the rear of the mass center, and judging the easy swinging degree when the trailer is positioned in front of the mass center, in the center of the mass center and in the rear of the mass center.
2. The method of claim 1, wherein the minimum speed at which the trailer does not swing out of control and collapse under each condition is the highest safe vehicle speed when the trailer is positioned forward of the center of mass, centered on the center of mass, and rearward of the center of mass.
3. The test and evaluation method of trailer sway according to claim 1, wherein in S1, when the trailer is positioned forward of the centroid as viewed in the front-rear direction, the centroid of the trailer is positioned on the front side of the trailer axle; when the trailer is positioned near the center of mass, the mass center of the trailer is positioned at the axle of the trailer; when the trailer is positioned with the center of mass rearward, the center of mass of the trailer is positioned rearward of the trailer axle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111166671.1A CN113884313B (en) | 2021-09-30 | 2021-09-30 | Test evaluation method for trailer sway |
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| CN202111166671.1A CN113884313B (en) | 2021-09-30 | 2021-09-30 | Test evaluation method for trailer sway |
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| CN113884313B true CN113884313B (en) | 2024-02-13 |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114970257B (en) * | 2022-05-20 | 2024-06-25 | 大连理工大学 | Method for estimating centroid safety domain of trailer |
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| US10818106B2 (en) * | 2018-10-15 | 2020-10-27 | Bendix Commercial Vehicle Systems Llc | System and method for pre-trip inspection of a tractor-trailer |
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| CN101402363A (en) * | 2007-10-05 | 2009-04-08 | 福特全球技术公司 | Trailer oscillation detection and compensation method for a vehicle and trailer combination |
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