Topic
Air brake
About: Air brake is a research topic. Over the lifetime, 6550 publications have been published within this topic receiving 45223 citations.
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Book•
01 Oct 1992
TL;DR: This book is a single source of information on all essential concepts, guidelines and design checks required for designing safer brakes.
Abstract: The objectives of this third edition of an SAE classic title are to provide readers with the basic theoretical fundamentals and analytical tools necessary to design braking systems for passenger vehicles and trucks that comply with safety standards, minimize consumer complaints, and perform safely and efficiently before and while electronic brake controls become active. This book, written for students, engineers, forensic experts, and brake technicians, provides readers with theoretical knowledge of braking physics, and offers numerous illustrations and equations that make the information easy to understand and apply. New to this edition are expanded chapters on: • Thermal analysis of automotive brakes • Analysis of hydraulic brake systems • Single vehicle braking dynamics
296 citations
Patent•
25 Aug 2011
TL;DR: In this article, the holding piston is represented as a differential differential piston, and the second ring surface of the differential piston is defined as a blockable hydraulic chamber, and a piston effect in the second chamber corresponds to a force that acts counter to the direction of actuation on the hold piston.
Abstract: A brake system includes a main brake cylinder and a pedal decoupling unit provided with a holding piston, the first ring surface thereof together with a first primary brake cylinder piston defining a first hydraulic chamber that is hydraulically pressurized with an electrically controllable pressure supply device. In order to improve the pedal characteristics of the brake system, in particular in a brake-by-wire brake system, the holding piston is embodied as a differential piston, the second ring surface thereof defining a second, blockable hydraulic chamber, and a piston effect in the second chamber corresponds to a force that acts counter to the direction of actuation on the holding piston.
240 citations
Patent•
07 Mar 1997
TL;DR: In this article, an improved electro-hydraulic brake system has been proposed for improving the pedal feel of the system, while further having design features which contribute to the economy of manufacture of certain components of the brake system.
Abstract: An improved electro-hydraulic brake system having features for improving the pedal feel of the system, while further having design features which contribute to the economy of manufacture of certain components of the system. The system provides for an electrically powered normal source of pressurized hydraulic brake fluid, and a manually powered backup source of pressurized hydraulic brake fluid to the vehicle brakes in the event of failure of the normal source. During normal braking, fluid from the backup source is redirected from the vehicle brakes to a pedal simulator. The pedal simulator preferably includes arrangements of spring loaded pistons, expansion volumes, and damping orifices, together with valves selectively controlling the flow of fluid to and from the pedal simulator which provides for an improved pedal feel during vehicle braking. The brake system of the invention further includes a relatively low cost fluid separator unit which is provided which prevents intermixing of pressurized fluid between the backup source and the normal source. The fluid separator unit acts to permit the normal source to act upon the hydraulic brake fluid of the backup source to operate the vehicle brakes. The fluid separator unit is preferably embodied as a piston having two working faces, each of the same diameter.
141 citations
Patent•
[...]
TL;DR: In this paper, the authors describe a brake control valve for a train of cars with fluid pressure brakes. But they do not discuss the operation of the triple valve devices or other brake controlling valve devices for facilitating the application and release of the brakes.
Abstract: This invention relates to fluid pressure brakes and particularly to apparatus for controlling the operation of the triple valve devices or other brake controlling valve devices for facilitating the application and release of the brakes on a train of cars. It is well known that the brake controlling...
139 citations
TL;DR: In this article, a longitudinal dynamical model is proposed for heavy-haul trains equipped with electronically controlled pneumatic brake systems, which is validated against experimental data collected on a train with 200 wagons operated by Spoornet on its COALlink.
Abstract: In this paper, a longitudinal dynamical model is proposed for heavy-haul trains equipped with electronically controlled pneumatic brake systems. It is validated against experimental data collected on a train with 200 wagons operated by Spoornet on its COALlink. Various data sets from actual trial runs, handwritten and electronic, off-line and on-line, are gathered and reconciled into a validation data set. Most system parameters are set in accordance with the experimental train setup, while certain parameters, such as damping coefficients, are estimated. The model is subjected to recorded input data for particular track sections. The resultant simulation outputs are compared to real-life data. From this study one may conclude that the longitudinal model is a justified choice for considering factors such as speed regulation, in-train force handling and energy consumption management of heavy-haul trains equipped with electronically controlled pneumatic brake systems.
133 citations