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Dynamic braking

About: Dynamic braking is a research topic. Over the lifetime, 3472 publications have been published within this topic receiving 34897 citations. The topic is also known as: Rheostatic brake.


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Patent
16 Apr 1990
TL;DR: A vehicle braking indicator system that provides continuous lighting of the vehicle stop light under normal braking conditions but causes the stop light to be intermittently lighted at a relatively high frequency when the anti-lock braking system is activated is described in this paper.
Abstract: A vehicle braking indicator system that provides a continuous lighting of the vehicle stop light under normal braking conditions but causes the stop light to be intermittently lighted at a relatively high frequency when the anti-lock braking system of the vehicle is activated.

24 citations

Patent
01 Apr 2010
TL;DR: In this paper, a locomotive and a plurality of freight cars are attached to the locomotive for movement along a railroad track, and the load units may be tanker cars, box cars, and/or flatbed cars.
Abstract: A rail vehicle system includes a locomotive and a plurality of load units (freight cars) attached to the locomotive for movement along a railroad track. The load units may be tanker cars, box cars, and/or flatbed cars. Each load unit includes a traction motor (connected to one or more wheels of the load unit), an electrical energy storage system onboard the load unit for providing electrical power to the load unit traction motor; and a load unit engine onboard the load unit that provides charging electric energy to the electrical energy storage system. (Alternatively or in addition, the electrical energy storage system may be charged through dynamic braking.) In a train formed of only the locomotive(s) and load units, all rail vehicles of the train, even freight cars, provide tractive effort.

24 citations

01 Jan 2013
TL;DR: In this article, a braking system for pneumatically braked heavy goods vehicles is introduced, which uses a wheel slip regulator based on sliding mode control to reduce stopping distances on smooth and rough, high friction (μ"="0.9") surfaces by 10% and 27% respectively.
Abstract: Heavy goods vehicles exhibit poor braking performance in emergency situations when compared to other vehicles. Part of the problem is caused by sluggish pneumatic brake actuators, which limit the control bandwidth of their antilock braking systems. In addition, heuristic control algorithms are used that do not achieve the maximum braking force throughout the stop. In this article, a novel braking system is introduced for pneumatically braked heavy goods vehicles. The conventional brake actuators are improved by placing high-bandwidth, binary-actuated valves directly on the brake chambers. A made-for-purpose valve is described. It achieves a switching delay of 3–4 ms in tests, which is an order of magnitude faster than solenoids in conventional anti-lock braking systems. The heuristic braking control algorithms are replaced with a wheel slip regulator based on sliding mode control. The combined actuator and slip controller are shown to reduce stopping distances on smooth and rough, high friction (μ = 0.9) surfaces by 10% and 27% respectively in hardware-in-the-loop tests compared with conventional ABS. On smooth and rough, low friction (μ = 0.2) surfaces, stopping distances are reduced by 23% and 25%, respectively. Moreover, the overall air reservoir size required on a heavy goods vehicle is governed by its air usage during an anti-lock braking stop on a low friction, smooth surface. The 37% reduction in air usage observed in hardware-in-the-loop tests on this surface therefore represents the potential reduction in reservoir size that could be achieved by the new system.

24 citations

Journal ArticleDOI
TL;DR: A " Train Following Theory " is put forward and it is one of the key mathematical theories to be established for MBS before RDBM is implemented and the two strategies are compared in terms of train operation efficiency.
Abstract: With development of modern telecommunication, computer and control techniques, train operation control system, particularly for high speed trains, will be transited from Fixed Block Systems (FBS) to Moving Block Systems (MBS). MBS is an intelligent, comprehensive and modern train operation control system and its development reflects the trend of train operation control and management system in the future. There are two train operation control modes in MBS: Absolute Distance Braking Mode(ADBM) and Relative Distance Braking Mode (RDBM). The two different control modes are with the different efficiency and the different risk. At present, the concepts for RDBM has been widely applied in the control systems for road traffic. However, it is the first time that the idea is tried to be implemented in train control systems. The definitions for ADBM and RDBM and their relevant concepts are given and explained firstly in the paper. The mathematics model for " Car Following Theory (CFT)" is applied to describe the performance of MBS for ADBM and RDBM with different conditions. A " Train Following Theory " is put forward and it is one of the key mathematical theories to be established for MBS before RDBM is implemented. Under the conditions of train operation safety, the two strategies are compared in terms of train operation efficiency. The factors to affect safety and efficiency of train operation for RDBM in MBS are analyzed. Transactions on the Built Environment vol 34, © 1998 WIT Press, www.witpress.com, ISSN 1743-3509

24 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202376
2022156
20216
202018
201925
201834