Rear-end collision

About: Rear-end collision is a research topic. Over the lifetime, 618 publications have been published within this topic receiving 5666 citations. The topic is also known as: shunt.

Testing method for rear-end collision of running vehicle and testing apparatus for collision of vehicle

Abstract: PROBLEM TO BE SOLVED: To provide a testing method in which a test of making a succeeding vehicle collide with a preceding running test vehicle can be made. SOLUTION: Two test vehicles T1 , T2 are installed at a prescribed interval in the running direction of a running road Ra, two traction wire ropes Wa, Wi arranged on the running road Ra are engaged with respective skaters S1 , S2 used to connect the two test vehicles T1 , T2 , and the wire ropes Wa, Wi are driven and run at different speeds and independently. In a state that the running speed V2 of the test vehicle T2 on the rear side is made larger than the running speed V1 of the test vehicle T1 on the front side, the test vehicles T1 , T2 are pulled and run, and they are made to collide from behind in a collision point P to be set on a pit 1.

An algorithm for rear-end collision avoidance warning systems

Abstract: The National Highway Traffic Safety Administration (NHTSA), supported by The Johns Hopkins University Applied Physics Laboratory (JHU/APL), has developed an algorithm for use with rear-end collision avoidance systems that alerts drivers to potentially dangerous driving situations and the need to take evasive action. This algorithm is to be integrated into a General Motors (GM) developed collision warning system for use during the Automotive Collision Avoidance System (ACAS) Field Operational Test (FOT). The NHTSA algorithm uses the host vehicle velocity and acceleration along with the collision warning system-supplied values for range, range rate, and relative acceleration of the lead vehicle to calculate a miss-distance between the host and lead vehicles at 0.1-second intervals. The miss-distance is the closest distance that occurs between the two vehicles if the driver of the host vehicle were to initiate braking after a delay time at a designated host vehicle maximum braking capability. This calculated distance is compared to a miss-distance threshold and if it is less, a warning is provided to the driver. The algorithm accounts for a driver sensitivity setting and includes a look-ahead calculation to determine if the threshold would be passed before the next time interval. The performance of the algorithm has been examined against designated operational scenarios. These scenarios include cases of a constant speed host vehicle encountering a stopped lead vehicle, a constant speed host vehicle encountering a constant but slower speed lead vehicle, and a constant speed host vehicle encountering a lead vehicle braking from the same initial speed. For the covering abstract see ITRD E111577.

Method for identifying rear end collision-critical situations in lines of traffic

Abstract: The invention relates to a method for identifying rear end collision-critical situations in lines of traffic during which at least the distance (xrel) from an object (2) located, in the direction of travel, in the area in front of a vehicle (1) and the proper speed (vego) of the vehicle (1) are detected and monitored in order to determine if the vehicle (1) is located in a line of traffic susceptible to rear end collisions. The time interval (TH) from the object (2) is determined as the quotient consisting of the distance (xrel) of the object (2) from the vehicle (1), and of the proper speed (vego) of the vehicle. It is verified whether the determined time interval (TH) during a predeterminable time span is located within a predeterminable range. This makes it possible to reliably identify when the vehicle is traveling in a line of traffic. Also monitored is the braking acceleration of the object that significantly influences the risk of a rear-end collision.

Drive assist device of vehicle

Abstract: PROBLEM TO BE SOLVED: To improve a driving feeling by properly recognizing the traveling states of a preceding vehicle, one's own vehicle and a following vehicle and supporting the own vehicle position against the preceding vehicle and the following vehicle to be an optimum position matched to actual traveling in consideration of the driving states of the preceding vehicle and the own vehicle and the driving states of the own vehicle and the following vehicle. SOLUTION: A control unit 7 carries out braking control and alarming control in correspondence with a rear end collision risk Rf with the preceding vehicle and a rear end collided risk Rr by the following vehicle by setting the rear end collision risk Rf with the preceding vehicle of the own vehicle 1 in correspondence with vehicle-to-vehicle time THWf of the own vehicle 1 and collision surplus time TTCf of the own vehicle and setting the rear end collided risk Rr by the following vehicle of the own vehicle 1 in correspondence with vehicle-to-vehicle time THWr of the following vehicle and collided surplus time TTCr of the own vehicle 1 weighted larger than weight of the collision surplus time TTCf at the rear end collision risk Rf with the preceding vehicle. COPYRIGHT: (C)2010,JPO&INPIT

Rear-end collision preventing system using a camera

Abstract: PURPOSE: A rear-end collision prevention system using camera is provided to prevent a rear-end collision due to this object by filming the front and/or rearward of a vehicle through a camera and grasping the access speed of an object approaching a vehicle through a photographed image. CONSTITUTION: A rear-end collision prevention system using camera(1) comprises a front camera(3), a car speed detecting unit(5), an image processor(7), a braking unit(9), and a control unit(11). A front camera films the front of a driving vehicle. A car speed detecting unit senses the car speed of a vehicle. An image processor measures the access speed at the critical location of an object approaching vehicle by analyzing the image of a front of a vehicle which is filmed with a front camera. A braking unit puts the brake on a vehicle by operating when the access speed of an object measured at an image processor is over the setting value. A control unit controls a front camera, a car speed detecting unit, an image processor, and a braking unit according to the data received from an image processor and a car speed detecting unit.