Truck cargo stability identification method based on AEB system

Abstract

The application discloses a truck cargo stability identification method based on an AEB system, obtains deceleration data by braking and decelerating under two conditions of tight cargo bundling and loose cargo of a test truck, and then draws deceleration curves under the two conditions, compares the two deceleration curves, finds out the change law of the deceleration curves, the deceleration frequency and the amplitude under the two conditions, and then compares the deceleration curve of the truck in the braking process in the transportation process with the deceleration curve obtained through the test to determine whether the cargo in the truck compartment in the transportation process is tightly bundled or loose. When the identified cargo of the truck is loose, the AEB system installed on the vehicle automatically reduces the deceleration of the vehicle to reduce the emergency braking intensity, so that the damage degree of the cargo is reduced and the driving safety of the truck is improved.

Description

Technical Field

[0001] This invention belongs to the field of freight truck operation technology, specifically relating to a freight truck cargo stability identification method based on an AEB system. Background Technology

[0002] Automatic Emergency Braking (AEB) is an electronic braking system and a type of active safety technology in automobiles. AEB assists the driver in emergency braking, meaning that when the vehicle is driving normally without adaptive cruise control, it will automatically brake when encountering a sudden dangerous situation or when the distance to the vehicle in front or pedestrians is less than a safe distance, thus avoiding or reducing the occurrence of rear-end collisions and other accidents, thereby improving driving safety. Starting May 1, 2021, relevant active safety regulations for commercial freight vehicles in China continued to be upgraded. Specifically, freight vehicles with a gross vehicle weight of 12,000 kg or more and a maximum speed of 90 km / h, tractor-trailers with a maximum speed of 90 km / h or more, and dangerous goods transport freight vehicles with a gross vehicle weight of 12,000 kg or more must be equipped with AEB systems. Equipping freight vehicles with AEB greatly improves the safety of freight vehicle operation, but it also introduces some other safety hazards. When trucks transport goods on the road, because the goods carried by the trucks are mostly heavy objects with great inertia, if the goods in the truck bed are not securely tied, once the emergency braking force of the AEB system is too great, the goods in the truck bed will move due to inertia, which will cause damage to the transported goods and pose a danger to the people in the vehicle. Furthermore, the goods may also shift or even fall off during the journey, affecting the safe passage of other vehicles. Summary of the Invention

[0003] To address the problems in existing technologies, this invention provides a truck cargo stability identification method based on an AEB (Autonomous Emergency Braking) system, comprising the following steps:

[0004] S1. Test the same type of cargo truck by braking under two conditions: when the cargo is securely secured and when the cargo is loose.

[0005] S2. The deceleration data of the vehicle is collected by installing a vehicle speed sensor and a brake deceleration meter on the test truck, and the deceleration curves of the truck with the cargo securely tied and the truck with the cargo loosely tied are plotted based on the collected deceleration data.

[0006] S3. By comparing and analyzing the deceleration curves of trucks with securely tied cargo and trucks with loose cargo, the deceleration variation pattern is derived:

[0007] When the cargo is securely fastened, the deceleration curve of the truck is smooth during braking, with no significant fluctuations in deceleration frequency and amplitude.

[0008] When the cargo in the truck is loose, the deceleration curve is steep when the truck brakes, and the deceleration frequency and amplitude fluctuate significantly.

[0009] S4. Automatically identify the deceleration curve of any truck during braking during transportation. Compare the identified deceleration curve of any transport truck with the deceleration curve of a test truck when the cargo is securely strapped. By setting thresholds for changes in deceleration frequency and amplitude, determine whether the cargo of any transport truck is securely strapped.

[0010] If the deceleration frequency and amplitude in the deceleration curve of any identified transport truck do not exceed the change threshold, then the cargo of the transport truck is securely secured, and braking should proceed at normal braking speed.

[0011] If the deceleration frequency and amplitude of any identified transport truck exceed the change threshold, the cargo in that transport truck is not securely tied, and the AEB system will automatically reduce the braking deceleration of the transport truck to brake it.

[0012] Furthermore, in step S1, the cargo truck is equipped with a load sensor, and the load sensor should detect a load of more than 50% on the truck.

[0013] Furthermore, in step S1, the freight trucks transporting goods travel at a constant speed on the designated transport route and brake with approximately the same braking force.

[0014] Furthermore, setting threshold values ​​for deceleration frequency and amplitude involves comparing the deceleration curve identified by any cargo truck with the deceleration curve of the test truck when the cargo is securely tied, and setting the deceleration frequency threshold and deceleration amplitude threshold based on the magnitude of the difference between the two.

[0015] Furthermore, the threshold for the change in deceleration frequency is set to 20%.

[0016] Furthermore, the threshold for the change in deceleration amplitude is set to 30%.

[0017] Furthermore, the braking deceleration automatically reduced by the AEB system is 40% lower than the normal braking deceleration, which is the braking deceleration when the cargo in the transport truck is not securely fastened.

[0018] Furthermore, the braking deceleration meter consists of two parts: a display and a sensor. During braking detection, the display shapes, amplifies, and analyzes the signal transmitted from the sensor to obtain the braking deceleration and braking time.

[0019] Compared with existing technologies, this invention proposes a truck cargo stability identification method based on an AEB system to analyze whether the cargo in the truck bed is securely fastened. By comparing the truck's deceleration curve with a pre-calibrated deceleration curve, if the deceleration curve is relatively steep and the deceleration frequency change threshold exceeds 20%, or the deceleration amplitude change threshold exceeds 30%, it proves that the cargo in the truck bed is not securely fastened. The truck's AEB system then automatically reduces the braking deceleration, thereby reducing the damage to the cargo in the truck bed and improving truck driving safety. Attached Figure Description

[0020] Figure 1 This is a flowchart of a truck cargo stability identification method based on the AEB system. Detailed Implementation

[0021] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] This invention provides a method for identifying cargo stability in trucks based on an AEB (Autonomous Emergency Braking) system, with specific steps detailed in the appendix. Figure 1 .

[0023] Step 1: Test the same type of cargo truck by applying the brakes in two scenarios: when the cargo is securely secured and when the cargo is loose.

[0024] Specifically, a certain model of freight truck was used as the test truck. When the load sensor installed on the truck detected that the truck's load exceeded 50%, the truck driver drove the vehicle at the same speed on a prescribed transport route and applied the same braking force under two conditions: the cargo was securely fastened and the cargo was somewhat loose. The deceleration curves of the truck under these two conditions were obtained. The purpose was to calibrate the deceleration curves during comparative analysis, thereby obtaining the law of deceleration curve change to infer the stability of the cargo.

[0025] According to an embodiment of the present invention, the load sensor is installed on the frame directly below the chassis of the truck, with the installation position close to the middle part of the axle.

[0026] According to an embodiment of the present invention, when the goods inside the carriage are securely secured, the driver drives the truck at a constant speed under a certain load on a designated transport route and brakes the vehicle normally with a certain amount of power.

[0027] According to an embodiment of the present invention, when the cargo inside the truck is somewhat loose, the driver drives the truck under the same conditions as described above and uses a fixed power to drive the vehicle for normal braking.

[0028] According to an embodiment of the present invention, when braking and decelerating with a certain braking force, the braking force is relatively similar for trucks with securely tied cargo and trucks with loose cargo.

[0029] Step 2: Collect vehicle deceleration data by installing speed sensors and brake deceleration meters on the test truck, and plot the deceleration curves of the truck with securely tied cargo and the truck with loose cargo based on the collected deceleration data.

[0030] Specifically, the vehicle speed sensor directly utilizes the vehicle speed sensor mounted on the transmission of the truck to collect the vehicle's speed. The braking deceleration meter consists of a display and a sensor. During truck braking detection, the display is placed on the floor of the cab or cargo box, facing upwards with its front end aligned with the direction of travel and close to a fixed component. The display shapes, amplifies, analyzes, and processes the signal from the sensor, ultimately displaying the braking deceleration and braking time. Further processing of the obtained deceleration data allows for the plotting of deceleration curves for both cases of no cargo loosening and cases of some cargo loosening. These two deceleration curves are used for subsequent curve calibration.

[0031] Step 3: By comparing and analyzing the deceleration curves of trucks with securely tied cargo and trucks with loose cargo, the deceleration variation pattern can be derived.

[0032] Specifically, by comparing the deceleration curves under the two scenarios described above, we can identify the changing patterns of deceleration frequency and amplitude in the braking deceleration curve when the cargo is loose. Clearly, when the cargo is loose within the truck bed, the characteristics of the deceleration frequency and amplitude changes in the deceleration curve obtained during truck braking differ from those when the cargo is not loose. The specific differences are as follows:

[0033] 1. Overall variation pattern of the deceleration curve:

[0034] (1) When the cargo in the truck is not loose, the deceleration curve of the truck during braking is relatively flat. This is because the weight of the cargo increases the inertia of the truck, making it take longer for the truck to decelerate. In addition, the cargo in the truck will provide additional resistance and stabilizing effect. Therefore, the deceleration curve drawn based on the deceleration data is relatively smooth.

[0035] (2) When the cargo in the truck is somewhat loose, the deceleration curve of the truck during braking is relatively steeper. Loose cargo means that the cargo can move back and forth or roll in the truck, which will make the center of gravity of the truck unstable. This will reduce the frictional resistance when the truck brakes, making the vehicle more likely to slide or slip, which will require greater braking force to decelerate. Therefore, the deceleration curve drawn based on the deceleration data will be steeper.

[0036] 2. The variation pattern of deceleration frequency in the deceleration curve:

[0037] (1) When the cargo in the truck is not loose, the deceleration frequency in the obtained deceleration curve will gradually increase steadily until the truck stops.

[0038] (2) When the cargo in the truck is loose, the deceleration frequency in the deceleration curve obtained when the truck brakes changes by about 20% compared to the deceleration frequency obtained when the cargo is not loose, and the overall deceleration frequency also gradually increases until the truck stops.

[0039] 3. The variation pattern of deceleration amplitude in the deceleration curve:

[0040] (1) When the cargo in the truck is not loose, the deceleration amplitude in the deceleration curve obtained when the truck brakes will gradually decrease until the truck stops. The magnitude of the deceleration is related to the vehicle speed and the magnitude of the braking force, but the vehicle speed and braking force of the truck are constant in the test.

[0041] (2) When the cargo in the truck is loose, the deceleration amplitude of the deceleration curve obtained when the truck brakes is about 30% different from the deceleration amplitude of the deceleration curve obtained when the cargo is not loose. The overall trend of the deceleration amplitude is to gradually decrease until the truck stops. The magnitude of the deceleration is related to the vehicle speed, braking force and the degree of cargo looseness.

[0042] Step 4: Automatically identify the deceleration curve of any truck during braking during transportation. Compare the identified deceleration curve of any transport truck with the deceleration curve of the test truck when the cargo is securely tied. By setting change thresholds for deceleration frequency and amplitude, determine whether the cargo of any transport truck is securely tied.

[0043] Based on the obtained deceleration curve variation pattern, the stability of the cargo in the truck is inferred. Thresholds are set for the changes in deceleration frequency and deceleration amplitude in the deceleration curve when the cargo becomes loose, specifically, a deceleration frequency change threshold of 20% and a deceleration amplitude change threshold of 30%. When the changes in deceleration frequency and deceleration amplitude in the deceleration curve detected during a certain cargo transportation process exceed the set thresholds, it is considered that the cargo in the truck compartment is loose, and the AEB system will automatically reduce the truck's deceleration by 40% to brake and decelerate.

[0044] Specifically, during a cargo transport operation, if the deceleration curve of the identified vehicle during braking becomes steeper instead of gentle, and the deceleration curve of the identified vehicle is compared with the deceleration curve of the test vehicle when the cargo is not loose, and the frequency variation range of the deceleration curve exceeds 20%, or the amplitude variation range of the deceleration curve exceeds 30%, it is considered that the cargo in the truck bed has become loose. At this point, the AEB system installed on the vehicle automatically reduces the vehicle's deceleration by 40% to brake and slow down, thereby reducing the emergency braking force and minimizing the damage to the cargo.

[0045] According to an embodiment of the present invention, in order to apply the truck cargo stability identification method of the present invention more accurately, corresponding deceleration curves for securely secured cargo and deceleration curves for loose cargo should be obtained for different models of trucks as test trucks as calibration curves. These are then compared and identified with trucks of the same model during actual transportation. Finally, it is determined whether the cargo in the truck bed is securely secured and not loose. If loose cargo is detected, the truck should be automatically decelerated by 40% and braked via the AEB system. Before deceleration detection during braking, the load capacity of the truck is measured using a load sensor. When the load capacity of the truck exceeds 50%, the identification method of the present invention is more accurate.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for identifying cargo stability in trucks based on an AEB (Autonomous Emergency Braking) system, characterized in that, Includes the following steps: S1. Conduct a test on a cargo truck of the same model, applying braking under two conditions: with the cargo securely fastened and with the cargo loose. The cargo truck is equipped with a load sensor, and the load detected by the load sensor should be greater than 50%. S2. The deceleration data of the vehicle is collected by installing a vehicle speed sensor and a brake deceleration meter on the test truck, and the deceleration curves of the truck with the cargo securely tied and the truck with the cargo loosely tied are plotted based on the collected deceleration data. S3. By comparing and analyzing the deceleration curves of trucks with securely tied cargo and trucks with loose cargo, the deceleration variation pattern is derived: When the cargo is securely fastened, the deceleration curve of the truck is smooth during braking, with no significant fluctuations in deceleration frequency and amplitude. When the cargo in the truck is loose, the deceleration curve is steep when the truck brakes, and the deceleration frequency and amplitude fluctuate significantly. S4. Automatically identify the deceleration curve of any truck during braking during transportation. Compare the identified deceleration curve of any transport truck with the deceleration curve of a test truck when the cargo is securely strapped. By setting thresholds for changes in deceleration frequency and amplitude, determine whether the cargo of any transport truck is securely strapped. If the deceleration frequency and amplitude in the deceleration curve of any identified transport truck do not exceed the change threshold, then the cargo of the transport truck is securely secured, and braking is performed at normal braking speed. If the deceleration frequency and amplitude of any identified transport truck exceed the change threshold, the cargo in that transport truck is not securely tied, and the AEB system will automatically reduce the braking speed of the transport truck to brake it. The braking deceleration automatically reduced by the AEB system is 40% lower than the normal braking deceleration, which is the braking deceleration when the cargo in the transport truck is not securely fastened.

2. The truck cargo stability identification method based on the AEB system according to claim 1, characterized in that, In step S1, the freight trucks transporting goods travel at a constant speed on the designated transport route and brake with approximately the same braking force.

3. The truck cargo stability identification method based on the AEB system according to claim 1, characterized in that, Setting threshold values ​​for deceleration frequency and amplitude involves comparing the deceleration curve identified by any cargo truck with the deceleration curve of a test truck when the cargo is securely bundled, and setting the deceleration frequency and amplitude threshold values ​​based on the magnitude of the changes between the two.

4. The truck cargo stability identification method based on the AEB system according to claim 3, characterized in that, The threshold for the change in deceleration frequency is set to 20%.

5. The truck cargo stability identification method based on the AEB system according to claim 3, characterized in that, The threshold for the change in deceleration amplitude is set to 30%.

6. The truck cargo stability identification method based on the AEB system according to claim 1, characterized in that, The braking deceleration meter consists of a display and a sensor. During braking detection, the display shapes, amplifies, and analyzes the signal transmitted from the sensor to obtain the braking deceleration and braking time.

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