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Collision avoidance system

About: Collision avoidance system is a research topic. Over the lifetime, 1788 publications have been published within this topic receiving 23667 citations.


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Patent
10 Apr 2013
TL;DR: In this paper, the brake device of an automobile collision avoidance system is designed to brake in time, prevent rear-end collision and avoid traffic accidents, but it is difficult to install and use.
Abstract: The utility model relates to a brake device of an automobile collision avoidance system. The brake device of the automobile collision avoidance system can effectively brake in time, prevent rear-end collision and avoid traffic accidents. The technical scheme is that the brake device comprises a guide wheel assembly, steel wire ropes and a brake device. A reel assembly and the guide wheel assembly are arranged inside a shell body, the reel assembly is connected with the guide wheel assembly through the steel wire rope, the steel wire rope on the guide wheel assembly penetrates through a clamping plate hole of a clamping plate, the steel wire rope stretching out of the clamping plate hole is provided with a lock buckle, and the brake device is arranged on the clamping plate. The brake device of the automobile collision avoidance system is simple in structure, novel and unique, convenient to install and use and good in effect, and can effectively brake in time, prevent the rear-end collision of automobiles and avoid the traffic accidents.

5 citations

01 Apr 1977
TL;DR: This document describes a set of baseline collision avoidance algorithms which can be used as a point of departure for the development of final algorithms for the FAA's Beacon-based Collision Avoidance System (BCAS).
Abstract: This document describes a set of baseline collision avoidance algorithms which can be used as a point of departure for the development of final algorithms for the FAA's Beacon-based Collision Avoidance System (BCAS). The algorithms were structured to permit great flexibility in an experimental environment such as NAFEC. They incorporate a number of selectable options in the collision avoidance logic and in the display output. One option permits the selection of either a passive mode logic or an active mode logic. When the passive mode is selected, other options allow horizontal positive or negative commands to be used. In addition, the display of positive or negative commands can be selected or suppressed, and limit vertical rate commands can be selected for display independently of positive or negative commands. Two types of Intruder Position Data (IPD)-flashing IPD's and ordinary IPD's-can also be selected for display. The logic can drive three types of cockpit displays namely, an ACAS display, a baseline IPC display, and a general purpose Plan View Display (PVD). (Author)

5 citations

09 Sep 2014
TL;DR: In this paper, the authors provided an updated efficiency analysis of the LightForce space debris collision avoidance scheme, which aims to prevent collisions on warning by utilizing photon pressure from ground-based, commercial off-the-shelf lasers.
Abstract: This paper provides an updated efficiency analysis of the LightForce space debris collision avoidance scheme LightForce aims to prevent collisions on warning by utilizing photon pressure from ground based, commercial off the shelf lasers Past research has shown that a few ground-based systems consisting of 10 kilowatt class lasers directed by 15 meter telescopes with adaptive optics could lower the expected number of collisions in Low Earth Orbit (LEO) by an order of magnitude Our simulation approach utilizes the entire Two Line Element (TLE) catalogue in LEO for a given day as initial input Least-squares fitting of a TLE time series is used for an improved orbit estimate We then calculate the probability of collision for all LEO objects in the catalogue for a time step of the simulation The conjunctions that exceed a threshold probability of collision are then engaged by a simulated network of laser ground stations After those engagements, the perturbed orbits are used to re-assess the probability of collision and evaluate the efficiency of the system This paper describes new simulations with three updated aspects: 1) By utilizing a highly parallel simulation approach employing hundreds of processors, we have extended our analysis to a much broader dataset The simulation time is extended to one year 2) We analyze not only the efficiency of LightForce on conjunctions that naturally occur, but also take into account conjunctions caused by orbit perturbations due to LightForce engagements 3) We use a new simulation approach that is regularly updating the LightForce engagement strategy, as it would be during actual operations In this paper we present our simulation approach to parallelize the efficiency analysis, its computational performance and the resulting expected efficiency of the LightForce collision avoidance system Results indicate that utilizing a network of four LightForce stations with 20 kilowatt lasers, 85% of all conjunctions with a probability of collision Pc > 10 (sup -6) can be mitigated

5 citations

Dissertation
01 Jan 2008
TL;DR: In this paper, an automatic obstacle avoidance controller that integrates steering and braking action was developed to perform an ISO 3888-2 emergency obstacle avoidance manoeuvre in an industrial environment using a two-track vehicle model.
Abstract: As roads become busier and automotive technology improves, there is considerable potential for driver assistance systems to improve the safety of road users. Longitudinal collision warning and collision avoidance systems are starting to appear on production cars to assist drivers when required to stop in an emergency. Many luxury cars are also equipped with stability augmentation systems that prevent the car from spinning out of control during aggressive lateral manoeuvres. Combining these concepts, there is a natural progression to systems that could assist in aiding or performing lateral collision avoidance manoeuvres. A successful automatic lateral collision avoidance system would require convergent development of many fields of technology, from sensors and instrumentation to aid environmental awareness through to improvements in driver vehicle interfaces so that a degree of control can be smoothly and safely transferred between the driver and vehicle computer. A fundamental requirement of any collision avoidance system is determination of a feasible path that avoids obstacles and a means of causing the vehicle to follow that trajectory. This research focuses on feasible trajectory generation and development of an automatic obstacle avoidance controller that integrates steering and braking action. A controller is developed to cause a specially modified car (a Mercedes `S' class with steer-by-wire and brake-by-wire capability) to perform an ISO 3888-2 emergency obstacle avoidance manoeuvre. A nonlinear two-track vehicle model is developed and used to derive optimal controller parameters using a series of simulations. Feedforward and feedback control is used to track a feasible reference trajectory. The feedforward control loops use inverse models of the vehicle dynamics. The feedback control loops are implemented as linear proportional controllers with a force allocation matrix used to apportion braking effort between redundant actuators. Two trajectory generation routines are developed: a geometric method, for steering a vehicle at its physical limits; and an optimal method, which integrates steering and braking action to make full use of available traction. The optimal trajectory is obtained using a multi-stage convex optimisation procedure. The overall controller performance is validated by simulation using a complex proprietary model of the vehicle that is reported to have been validated and calibrated against experimental data over several years of use in an industrial environment.

5 citations

Journal ArticleDOI
TL;DR: By solving the MDP with the value iteration method, sequential decisions on whether to wait can be made and an optimal waiting strategy can be obtained, which can be used to improve the human pilot’s user experience while ensuring safety.

5 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202316
202225
202156
202081
2019128
2018118