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Performance Based Brake Testers Round Robin Study
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Book Synopsis Performance-based brake testers-round robin study by :
Download or read book Performance-based brake testers-round robin study written by and published by . This book was released on 2000 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Federal Highway Administration. Office of Motor Carriers Publisher : ISBN 13 : Total Pages : pages Book Rating :4.:/5 (459 download)
Book Synopsis Performance-based Brake Testers by : United States. Federal Highway Administration. Office of Motor Carriers
Download or read book Performance-based Brake Testers written by United States. Federal Highway Administration. Office of Motor Carriers and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the results of a series of tests in which several different types of performance-based brake testers (PBBTs) were compared side-by-side (i.e. a round robin test) in their ability to accurately measure brake forces (BFs) and wheel loads (WLs) of commercial vehicles (CVs), and to then predict the vehicle deceleration capability for a 32.2 km/hr on-road stopping test. The PBBTs consisted of five roller dynamometers (RD), two flat plate (FP) testers, and one breakaway torque tester (BTT). A PBBT that can also meet a set of functional specifications could be used for law enforcement by safety inspectors once performance-based criteria are codified. In the test program, specific ratios of BF to WL were imposed on both a 5-axle combination tractor semi-trailer and a two-axle straight truck, in both the fully laden and unladen conditions. In each loading condition, the overall vehicle braking capability was set to achieve a proposed minimum requirement of 0.4g, where g is the acceleration due to gravity. In addition, the brakes on specific individual wheels were set to provide a BF/WL of 0.25 and 0.35, for a steer and a non-steer wheel, respectively. The vehicles were also instrumented to record stopping distances and decelerations from on-road stopping tests performed from 32.2 km/hr. In general, nearly all of the PBBTs were able to accurately measure the CVs' brake forces. Only one of the FP-type testers experienced erratic performance during the round robin. In contrast several of the PBBTs had difficulty in reporting the accurate gross vehicle weight. In some cases, particularly with the portable PBBTs the reported wheel loads for axles 2 and 4 (the lead axle on the tandem set) of the 5-axle vehicle were very high, leading to an under-prediction of the vehicle deceleration capability. Calibration checks of the PBBT weighing mechanisms indicated that all could meet the functional specifications. As such, it was concluded that accounting for the redistribution of axle loads due to the vehicle suspension and the geometry of the PBBT ramp would require special test procedures or remote entry of vehicle or axle weights for use in law enforcement. The repeatability of all the PBBTs was good, meeting the acceptability criteria in more than 93 percent of the test cases.
Book Synopsis Performance-based Brake Testers: Round Robin Final Report by : Steven J. Shaffer
Download or read book Performance-based Brake Testers: Round Robin Final Report written by Steven J. Shaffer and published by . This book was released on 2000 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development, Evaluation, and Application of Performance-based Brake Testing Technologies by :
Download or read book Development, Evaluation, and Application of Performance-based Brake Testing Technologies written by and published by . This book was released on 1998 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Federal Register written by and published by . This book was released on 1993 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Technical Conference on Experimental Safety Vehicles. Thirteenth. Proceedings. Volume I. by :
Download or read book International Technical Conference on Experimental Safety Vehicles. Thirteenth. Proceedings. Volume I. written by and published by . This book was released on 1993 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis MVMA/NHTSA/SAE Heavy Truck Round Robin Brake Test by : R. C. Kempf
Download or read book MVMA/NHTSA/SAE Heavy Truck Round Robin Brake Test written by R. C. Kempf and published by . This book was released on 1992 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vehicle Dynamics, Braking, Steering, and Suspensions by :
Download or read book Vehicle Dynamics, Braking, Steering, and Suspensions written by and published by . This book was released on 2003 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Real-Time Dynamic Brake Assessment Proof of Concept Final Report by :
Download or read book Real-Time Dynamic Brake Assessment Proof of Concept Final Report written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This proof-of-concept research was performed to explore the feasibility of using real-world braking data from commercial motor vehicles to make a diagnosis of brake condition similar to that of the performance-based brake tester (PBBT). This was done by determining the relationship between pressure and brake force (P-BF), compensating for the gross vehicle weight (GVW). The nature of this P-BF relationship (e.g., low braking force for a given brake application pressure) may indicate brake system problems. In order to determine the relationship between brake force and brake application pressure, a few key parameters of duty cycle information were collected. Because braking events are often brief, spanning only a few seconds, a sample rate of 10 Hz was needed. The algorithm under development required brake application pressure and speed (from which deceleration was calculated). Accurate weight estimation was also needed to properly derive the braking force from the deceleration. In order to ensure that braking force was the predominant factor in deceleration for the segments of data used in analysis, the data was screened for grade as well. Also, the analysis needed to be based on pressures above the crack pressure. The crack pressure is the pressure below which the individual brakes are not applied due the nature of the mechanical system. This value, which may vary somewhat from one wheel end to another, is approximately 10 psi. Therefore, only pressures 15 psi and above were used in the analysis. The Department of Energy s Medium Truck Duty Cycle research has indicated that under the real-world circumstances of the test vehicle brake pressures of up to approximately 30 psi can be expected. Several different types of data were collected during the testing task of this project. Constant-pressure stopping tests were conducted at several combinations of brake application pressure (15, 20, 25, and 30 psi), load conditions (moderately and fully laden), and speeds (20 and 30 mph). Data was collected at 10 Hz. Standard and stepped-pressure performance-based brake tests with brake pressure transducers were performed for each loading condition. The stepped-pressure test included the constant-pressure intervals of brake application at 15, 20, 25, and 30 psi. The PBBT data files included 10 Hz streaming data collected during the testing of each axle. Two weeks of real-world duty cycle (driving and braking) data was also collected at 10 Hz. Initial analysis of the data revealed that the data collected in the field (i.e., day-to-day operations) provided the same information as that obtained from the controlled tests. Analysis of the data collected revealed a strong linear relationship between brake application pressure and deceleration for given GVWs. As anticipated, initial speed was not found to be a significant factor in the deceleration-pressure relationship, unlike GVW. The positive results obtained from this proof of concept test point to the need for further research to expand this concept. A second phase should include testing over a wider range of speeds and include medium brake application pressures in addition to the low pressures tested in this research. Testing on multiple vehicles would also be of value. This future phase should involve testing to determine how degradation of braking performance affects the pressure-deceleration relationship.
Book Synopsis Development, Evaluation, and Application of Performance-based Brake Testing Technologies by :
Download or read book Development, Evaluation, and Application of Performance-based Brake Testing Technologies written by and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of the field test portion of the Development, Evaluation, and Application of Performance Based Brake Testing Technologies (PBBT) Project sponsored by the U.S. Department of Transportation's Federal Highway Administration. A PBBT is a device that can assess the braking capabilities of a vehicle through a quantitative measure of either individual brake and/or overall braking performance in a controlled test. Various first and second generation PBBTs designed for use with commercial motor vehicles were evaluated at roadside commercial vehicle inspection stations. The results were collect and analyzed and recommendations for the use of PBBTs was reported.
Book Synopsis Annual Index/abstracts of SAE Technical Papers by :
Download or read book Annual Index/abstracts of SAE Technical Papers written by and published by . This book was released on 2006 with total page 1000 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Highway Safety Literature written by and published by . This book was released on 1977 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Report on Activities Under the National Traffic and Motor Vehicle Safety Act of 1966 and the Motor Vehicle Information and Cost Savings Act of 1972 by :
Download or read book A Report on Activities Under the National Traffic and Motor Vehicle Safety Act of 1966 and the Motor Vehicle Information and Cost Savings Act of 1972 written by and published by . This book was released on with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Object Detection, Collision Warning, and Avoidance Systems by : Ronald K. Jurgen
Download or read book Object Detection, Collision Warning, and Avoidance Systems written by Ronald K. Jurgen and published by SAE International. This book was released on 2007 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains 51 papers covering eight years of research on object detection, collision warning, and collision avoidance. Topics covered include: Parking aids; Target tracking with cameras; Sensor combinations; Blind spot detection; Imager chips; Lane tracking; Lane and road departure warning; Sensor fusion; Intersection collision warning; Front- and rear-end crash avoidance; Automatic collision avoidance systems; Braking systems for collision avoidance; and Driver-vehicle interface requirements.
Download or read book Highway Safety Literature written by and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations Publisher : ISBN 13 : Total Pages :1636 pages Book Rating :4.F/5 ( download)
Book Synopsis Department of Transportation and Related Agencies Appropriations for 1983 by : United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations
Download or read book Department of Transportation and Related Agencies Appropriations for 1983 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Transportation and Related Agencies Appropriations and published by . This book was released on 1982 with total page 1636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Literature Abstracts by : Society of Automotive Engineers
Download or read book Technical Literature Abstracts written by Society of Automotive Engineers and published by . This book was released on 2000 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: