Showing papers on "Rear-end collision published in 2020"

A new strategy for rear-end collision avoidance via autonomous steering and differential braking in highway driving

Abstract: This paper proposes a new safety system named emergency steering assist (ESA), which consists of the autonomous steering subsystem and differential braking subsystem. The control system is develope...

Study and Simulation Analysis of Vehicle Rear-End Collision Model considering Driver Types

Abstract: The reasonable distance between adjacent cars is very crucial for roadway traffic safety. For different types of drivers or different driving environments, the required safety distance is different. However, most of the existing rear-end collision models do not fully consider the subjective factor such as the driver. Firstly, the factors affecting driving drivers’ characteristics, such as driver age, gender, and driving experience are analyzed. Then, on the basis of this, drivers are classified according to reaction time. Secondly, three main factors affecting driving safety are analyzed by using fuzzy theory, and the new calculation method of the reaction time is obtained. Finally, the improved car-following safety model is established based on different reaction time. The experimental results have shown that our proposed model obtained more accurate vehicle safety distance with varied traffic kinematic conditions (i.e., different traffic states, varied driver types, etc.). The findings can help traffic regulation departments issue early warnings to avoid potential traffic accidents on roads.

Using a multi-user driving simulator system to explore the patterns of vehicle fleet rear-end collisions occurrence under different foggy conditions and speed limits

Abstract: Vehicle fleet rear-end collisions (FRECs) are an extremely fatal type of traffic collisions on freeway and they usually occur in foggy weather. This study aimed to explore the patterns of vehicle fleet rear-end collisions occurrence under different foggy conditions and speed limits on freeway. A multi-user driving simulator system was used to conduct the experiment and the driving behavior data were collected from eight participants. The experimental results showed that as the fog density increased, the length of vehicle fleet decreased significantly, and drivers tended to keep a more stable car-following distance. The fog weather and short vehicle gap prompted drivers to react faster and brake harder in respond to the leading vehicle's brake. In spite of the compensational behaviors, more FRECs were observed under heavy fog condition. Lowering speed limit can significantly reduce the FRECs under foggy conditions. As the speed limits reduced, drivers’ brake response time and speed variance significantly reduced. The study also found that drivers’ brake response time was negatively correlated with their positions in the fleet. Drivers in the front positions of the fleet had a longer response time than drivers in the back positions and thus were more likely to encounter collisions. The study generated a better understanding of drivers’ behavioral pattern in a vehicle fleet and the patterns of vehicle fleet rear-end collisions occurrence. The findings also shed lights on the design of driver assistance system for complex driving situations such as freeway driving under adverse weather.

Research of Vehicle Rear-End Collision Model considering Multiple Factors

Abstract: The accuracy of the rear-end collision models is crucial for the early warning of potential traffic accident identification, and thus analyzes of the main factors influencing the rear-end collision relevant models is an active topic in the field. The previous studies have tried to determine the single factor influence on the rear-end collision model performance. Less attention was paid to exploit mutual influences on the model performance. To bridge the gap, we proposed an improved vehicle rear-end collision model by integrating varied factors which influence two parameters (i.e., response time and road adhesion coefficient). The two parameters were solved with the integrated weighting and neural network models, respectively. After that we analyzed the relationship between varied factors and the minimum car-following distance. The research findings support both the theoretical and practical guidance for transportation regulations to release more reasonable minimum headway distance to enhance the roadway traffic safety.

Relationship between truck driver fatigue and rear-end collision risk

Abstract: The fatigue of truck, bus, and taxi drivers has been a causal trigger for road accidents. However, the relationship between collision risk and the extent of objective fatigue has yet to be confirmed. In this study, we aimed to identify the relationship between autonomic nerve function as an objective parameter of fatigue and the extent of rear-end collision risk, which includes not only objectively risky events but also situations in which truck drivers require safety guidance from safety transport managers. Data of 33 truck driver participants (2 females, 31 males, 46.0 ± 9.1 years old, min-max: 24-65 years old) were analyzed. Drive recorder and automotive sensor data were collected over an eight-month period, and the autonomic nerve function during resting state in drivers was evaluated daily, pre- and post-shift, using pulse waves and electrocardiographic waveform measurement. The rear-end collision risk Index was developed using decision tree analysis of the audiovisual drive recorder data and distance data from the front automotive sensors. The rear-end collision risk index of shift-day was positively correlated with the sympathetic nerve activity index of post-shift condition on the previous day. This suggests that fatigue-related sympathetic nerve overactivity of post-shift condition increases the rear-end collision risk in the following day. Measures, such as actively seeking rest and undertaking fatigue recovery according to the degree of sympathetic nerve activity of post-shift condition, are necessary in order to prevent truck drivers' rear-end collisions.

Assessing the Effectiveness of Augmented Reality Cues in Preventing Rear-End Collisions: A Driving Simulator Study

Abstract: Rear-end collisions are one of the most common types of road accidents, often caused by the sudden deceleration of the leading vehicle during a car-following situation. In-vehicle applications based on Augmented Reality (AR) technology could optimize the driver’s visual attention, providing new and additional visual feedback to improve the driving experience. This study has focused on a new AR application aimed at improving the safety of rear-end driving conditions, by means of different AR video and audio warnings. A driving simulator study was carried out to test the effectiveness of the proposed AR system and assess the ability of drivers to avoid rear-end collisions, with and without the AR warnings, in an urban road scenario. Significant positive effects of the AR warnings on driving speeds and road safety were observed, mainly consisting in lower speeds, decelerations and reaction times and improved surrogate measures of safety.

Rear-end collision sensing system for telegraph pole of wayside

Abstract: The present invention relates to a collision monitoring system for a roadside telephone pole for power distribution. The system monitors in real time whether there is a vehicle, which is suspected to drive towards a corresponding telephone pole while going from its driving road into a sidewalk where the corresponding telephone pole is installed, by using a vehicle sensor and sensing parts based on light detection sensors in a predetermined area preset with respect to roadside telephone poles for power distribution, and then, automatically expands a ring-shaped air guard of the telephone pole in accordance with a result of the monitoring, thus significantly reducing damage caused by a collision between the telephone pole and the vehicle while more safely protecting the vehicle and passengers in the vehicle. According to the present invention, the collision monitoring system for a roadside telephone pole for power distribution includes a housing, an air compressor, a ring-shaped air guard, a first sensing part, a second sensing part, a vehicle sensor and a control part.

Rear-end collision early warning method based on VARMA model short-time prediction

Abstract: The invention discloses a rear-end collision early warning method based on VARMA model short-time prediction. The method includes: firstly, obtaining vehicle state data based on the Internet of Vehicles and a vehicle-mounted measuring instrument; judging whether the vehicle state data is unit root non-stationary or not according to the position, speed and acceleration information of the vehicle and the leading vehicle and the weather conditions of the located road section, and respectively constructing a VARMA model, an ECM-VAR model and an estimation coefficient matrix for stationary and non-stationary data; calculating a vehicle state prediction value from t to t + h, and obtaining a prediction value of the relative distance between the two vehicles on the premise of supposing the deceleration of the front vehicle; judging the size relationship between the relative distance prediction value and the safe following distance, and sending a rear-end collision early warning report when the relative distance is smaller than the safe following distance; the method has high prediction precision, predicts the future vehicle state by means of the VARMA model, improves the rear-end collision early warning precision, and extends the early warning time span; and the method can be applied to an auxiliary driving system of the Internet of Vehicles.

Vehicle rear-end collision early warning system and method based on double-flashing-lamp recognition

Abstract: The invention belongs to the field of traffic safety and discloses a vehicle rear-end collision early warning system and method based on double-flashing-lamp recognition. According to the vehicle rear-end collision early warning system and early warning method based on double-flashing-lamp recognition, traffic accidents happening on a road can be detected in time, accurate accident information such as accident positions and driver consciousness state information is obtained, and the accident information is transmitted to a control center through an LED displayer so that workers can take measures conveniently; and meanwhile, the accident information is used for providing early warning for rear vehicles through a roadside LED information board and a tweeter, so that casualties are reduced, and meanwhile, secondary accidents are avoided.

Rear-end collision prevention early warning and control method and system based on vehicle-mounted communication

Abstract: The invention discloses a rear-end collision prevention early warning and control method based on vehicle-mounted communication, and the method comprises the following steps: 1, all vehicles broadcasting the detailed driving state information of the vehicles through the vehicle-mounted communication in a driving process; 2, the vehicle receiving driving state information of a rear vehicle; 3, if the risk of rear-end collision does not exist, the vehicle keeping the original driving state, otherwise, conducting secondary judgment according to the driving state information of the rear vehicle, and therefore corresponding early warning and/or collision avoidance strategy control are/is conducted on the vehicle and the rear vehicle; and 4, after the collision danger is avoided, the whole system quiting work. According to the rear-end collision prevention early warning and control method based on vehicle-mounted communication, through the arrangement of the first step, the second step, thethird step and the fourth step, judgment can be effectively achieved in combination with the specific state of the vehicle, and the collision avoidance performance is greatly improved.

Active protection method for preventing rear-end collision of electric truck in unmanned driving mode

Abstract: The invention particularly relates to an active protection method for preventing rear-end collision of an electric truck in an unmanned driving mode. The active protection method sequentially comprises the following steps: a driving monitoring step, a judging step and an execution step. When the truck is braked under a certain condition, a control unit sends a signal to an execution unit, and theexecution unit lowers an anti-drilling device on the rear lower portion of the electric truck by delta H to make the distance H between the anti-drilling device and the ground consistent with the height H0 between the anti-drilling device and the ground when the truck stops or runs at a constant speed; and the upwarping height of the rear end of the truck during braking is compensated, so that a rear-end collision vehicle behind the electric truck can collide with the anti-drilling device at the rear lower part of the electric truck at a correct position during emergency braking of the electric truck, the due effect of the anti-drilling device is exerted, and the protection of the electric truck to the rear-end collision vehicle in a rear-end collision accident is greatly improved.

Highway tunnel rear-end collision prevention early warning method based on video technology

Abstract: The invention discloses a highway tunnel rear-end collision prevention early warning method based on a video technology. The method comprises the steps of installing a roadside camera and an electronic display screen; processing acquired video data by adopting an ST-MRF vehicle tracking technology to obtain vehicle position information and a speed, acceleration/braking deceleration and acceleration time/braking time; based on a camera calibration coordinate conversion method, performing mutual conversion on distances from front and rear vehicles to a lens center point in an actual traffic scene and the distance on an image plane to calculate the distance S between the front and rear vehicles; establishing a theoretical calculation model of an early-warning longitudinal safety distance of the rear vehicle, and calculating the early-warning longitudinal distance L of the rear vehicle in real time; and if the distance S between the front vehicle and the rear vehicle is less than the earlywarning longitudinal safety distance L of the rear vehicle, displaying early warning information on an electronic display screen to remind a driver. In the invention, occurrence of tunnel rear-end collision accidents can be effectively avoided, a traffic capacity of roads in a tunnel is increased, and tunnel driving safety is ensured.

Expressway automobile rear-end collision prevention system and working method thereof

Abstract: The invention discloses an expressway automobile rear-end collision prevention system and a working method thereof. According to the system, a non-contact radio frequency identification mode based onRFID is adopted to realize vehicle positioning and vehicle speed identification, and early warning of vehicle tailgating is realized, so that the problem of failure of rear-end collision early warningwhen encountering curve obstacles in a rear-end collision prevention system based on laser and radar technologies is solved, the problem of poor real-time performance of rear-end collision early warning in the rear-end collision prevention system based on an image recognition technology is solved, and the problem that lanes cannot be distinguished in the rear-end collision prevention system basedon a global positioning technology is solved. The system is simple in structure; the position of a vehicle Cj is obtained by reading RFID non-contact radio frequency identification electronic tags placed at equal intervals PL on the center line of the traffic lane; and the system has 100% acquisition accuracy and shortest position acquisition time, is not influenced by weather factors and curve obstacles, and ensures the real-time performance of early warning of the vehicle rear-end collision prevention system.

Backward rear-end collision active avoidance method and system, and storage medium

Abstract: The invention relates to a backward rear-end collision active avoidance method and system, and a computer storage medium for implementing the backward rear-end collision active avoidance method. The backward rear-end collision active avoidance method comprises the following steps an information acquisition step acquiring driving information of a vehicle, a front vehicle and a rear vehicle, and acquiring the driving information of vehicles on adjacent lanes of the vehicle; a first collision time calculation step calculating first collision time TTC1 of the rear vehicle relative to the vehicle on the basis of the driving information of the rear vehicle and the vehicle; a control command generating step when the first collision time TTC1 is smaller than or equal to a preset first threshold value, generating a control command according to the following modes, wherein the modes include that if a distance between the vehicle and the front vehicle is larger than a preset distance, an acceleration command is generated; if the distance between the vehicle and the front vehicle is smaller than or equal to the preset distance, whether lane changing to the adjacent lane is allowed or not is judged, and a lane changing command is generated under the condition that the lane is changed to the adjacent lane; and a control step controlling the vehicle on the basis of the generated control command.

System and method for rear-end collision prevention based on states of vehicles ahead

Abstract: The invention relates to a system for rear-end collision prevention based on the states of vehicles ahead. The system for rear-end collision prevention based on the states of vehicles ahead comprises:a receiving unit for receiving front vehicle driving information of N vehicles head, wherein the N vehicles ahead and a vehicle are located in the same lane, and N is larger than or equal to 2; a vehicle information acquisition unit for acquiring the driving information of the vehicle; a processing unit used for calculating the collision time between every two adjacent vehicles according to the front vehicle driving information of the N vehicles ahead and the driving information of the vehicle and judging whether the vehicle needs to be braked or not based on the collision time between everytwo adjacent vehicles; and a braking unit used for braking based on the judgment result of the processing unit. The invention further relates to a method for rear-end collision prevention based on thestates of the vehicles ahead. The occurrence of multi-vehicle rear-end collision accidents can be avoided to a great extent.

Safe Following Distances for Motorcycle to Prevent Rear-end Collision

Abstract: Rear-end collision is one of the top accidents for the motorcycle in ASEAN countries because the motorcyclists always keep their following distances too short. There are no specific safe distances suggested for motorcycle especially in an emergency braking situation. This study proposed a model based on the piecewise linear model of motorcycle braking deceleration profile and kinematic equations for calculating the stopping distances in a worst-case scenario. The calculated results were compared to the braking experiment and test results from other studies. The information from this study can be useful to relevant authorities such as driving institutes and enforcement agencies in order to setup a safety measure for the motorcyclists.

Rear-end collision prevention method in yellow light passing period of vehicle

Abstract: The invention discloses a rear-end collision prevention method in a yellow light passing period of a vehicle. The method comprises the steps of firstly judging whether a signal lamp in front of the vehicle is in a yellow light state or has a green light-to-yellow light conversion interval; judging whether a vehicle exists in a threshold range of the distance in front of the vehicle or not; acquiring speed information of the front vehicle and the own vehicle, judging whether the front vehicle and the own vehicle have acceleration and deceleration conditions or not, and judging acceleration anddeceleration states of the front vehicle and the own vehicle; and finally, judging whether an unsafe motion state of the front vehicle and the rear vehicle exists or not according to a preset safety distance threshold value of the front vehicle and the rear vehicle and acceleration and deceleration states of the front vehicle and the vehicle; if yes, controlling the AEB system of the vehicle to enter different braking modes according to different states of unsafe movement of the front vehicle and the rear vehicle. The method is suitable for vehicles provided with AEB systems, the safety of thevehicles passing through the intersection during the yellow light period is effectively improved, and rear-end collision accidents are prevented.

Automobile high-speed working condition anti-collision rear-end collision device and method

Abstract: The invention relates to an automobile high-speed working condition anti-collision rear-end collision device and method, and the method comprises the following steps: 1), the state information of a vehicle running in front of the same lane, the information of a vehicle running behind the same lane and the information of a vehicle running on an adjacent lane during the high-speed running of an automobile are detected; 2) when the vehicle running in front of the same lane is braked suddenly, the vehicle decelerates and keeps a safe distance from the front vehicle, and when the vehicle decelerates to a lower limit value, the vehicle runs according to the following method: when no vehicle runs behind the same lane, the automatic driving module controls the vehicle to decelerate continuously and keep a safe distance from the front vehicle on the same lane; when there is a driving vehicle behind the same lane and there is no driving vehicle in front of and behind the adjacent lane, the pathplanning module plans a lane changing track, and the automatic driving module controls the vehicle to drive according to the lane changing track and change the lane to the adjacent lane. The device and the method are beneficial to avoiding collision and rear-end collision between the automobile and surrounding driving vehicles during high-speed driving, and the driving safety is improved.

Backward rear-end collision prevention control method and device

Abstract: The invention provides a backward rear-end collision prevention control method and device, and the method comprises the steps: obtaining surrounding environment information of a vehicle, and enablingthe surrounding environment information to at least comprise information of a front obstacle and information of a rear obstacle; if the rear obstacle is a preset risk obstacle, calculating a rear-endcollision risk level according to the information of the rear obstacle; when the backward rear-end collision danger level meets the preset level condition and a backward rear-end collision preventionactivation signal is obtained, judging whether there is a front bufferable path or not according to the information of the front obstacle; if YES, judging whether the vehicle state information meets apreset forward movement condition or not; and if the vehicle state information meets the preset forward motion condition, executing a preset active protection operation. Based on the method disclosedby the invention, the potential dangerous target behind the vehicle can be actively avoided, so that the risk of rear-end collision of the vehicle is reduced.

Real-time system and method for warning rear-end collision

Abstract: A real-time collision warning system according to an embodiment of the present invention includes: a vehicle module installed in a vehicle and measuring vehicle operation information on the vehicle; a roadside device installed in a partition section of a road, receiving the vehicle operation information from the vehicle module in a case where the vehicle module operates in the partition section, and calculating a representative value by section by using the received vehicle operation information; and a control server calculating an accident risk by section by using the vehicle operation information and the representative value by section and transmitting the accident risk by section to the roadside device. The roadside device transmits the accident risk by section to the vehicle module. The vehicle module outputs the accident risk by section of the partition section. According to the present invention, the real-time collision warning system is capable of providing accident risk warning for every vehicle in a road section as well as a vehicle directly ahead. With the present invention, traffic accidents can be reduced based on calculation of accident risk for each vehicle by section and accident risk for each section of the road.

Active protection method and device for front bumper during rear-end collision of electric car

Abstract: The invention particularly relates to an active protection method and device for a front bumper during rear-end collision of an electric car. The protection method comprises a driving monitoring step,a judgment step and an execution step. When the running speed V of the car is greater than a certain speed and the braking acceleration signal a is greater than a certain value, a control unit sendsa signal to an execution unit, and the execution unit raises the front bumper by delta H, so that the distance H between the front bumper and the ground is consistent with the height H0 of the front bumper when the vehicle stops or runs at a constant speed; and when the electric car is braked emergently at a certain speed, the front bumper ascends by a certain height to overcome the defect that the height of the front bumper of the car descends during emergency braking, so the front bumper of the car is located at the correct height during rear-end collision of the car and a front car, the energy absorption effect of the bumper is achieved, and the safety of the car in a rear-end collision accident is greatly improved.

A device for absorbing shock of a rear end collision for a High Weight vehicle

Abstract: The present invention relates to a rear shock absorber of a heavy vehicle. The objective of the present invention is to provide the rear shock absorber of a heavy vehicle, wherein multiple plates having space portions are overlapped to effectively absorb impact force generated by a rear colliding vehicle to prevent the impact force from returning to the rear colliding vehicle, thereby absorbing and dispersing the impact force by sequential distortion of the multiple plates during a rear collision.

Motor vehicle rear-end collision prevention prompting method, motor vehicle rear-end collision prevention prompting system and motor vehicle

Abstract: The invention discloses a motor vehicle rear-end collision prevention prompting method The method comprises the following steps: obtaining the speed of a vehicle; obtaining the surrounding environment of the vehicle; outputting an early warning control signal according to the vehicle speed and the surrounding environment; and outputting a rear-end collision early warning prompt according to the early warning control signal The vehicle speed and the surrounding environment information are acquired, and the rear-end collision early warning prompt is output according to the vehicle speed and the surrounding environment information, so that the vehicle can acquire the rear-end collision early warning prompt through a front vehicle stop lamp and can also acquire the rear-end collision early warning prompt from the vehicle to perform rear-end collision early warning, and the rear-end collision prevention effect of the early warning prompt is further improved The invention further discloses a motor vehicle rear-end collision prevention prompting system and a motor vehicle