Your Selections

Brake drums
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Committees

Events

 

Downhill Safety Assistant Driving System for Battery Electric Vehicles on Mountain Roads

Wuhan University of Technology-Feng Jia'ao
  • Technical Paper
  • 2019-01-2129
To be published on 2019-09-15 by SAE International in United States
When driving in mountainous areas, vehicles often encounter downhill conditions. To ensure safe driving, it is necessary to control the speed of vehicles. For internal combustion engine vehicles, auxiliary brake such as engine brake can be used to alleviate the thermal load caused by the continuous braking of the friction brake. For battery electric vehicles (BEVs), regenerative braking can be used as auxiliary braking to improve brake safety. And through regenerative braking, energy can be partly converted into electrical energy and stored in accumulators (such as power batteries and supercapacitors), thus extending the mileage. However, the driver's line of sight in the mountains is limited, resulting in a certain degree of blindness in driving, so it is impossible to fully guarantee the safety and energy saving of downhill driving. Therefore, taking a battery electric light truck as an example, the system proposed in this paper first analyzes the driver's driving intention, proposes the system startup and exit strategy, and then combines the geographic information system (GIS) mountain road information, downslope speed limit and vehicle parameters,…
 
new

Speed Planning and Prompting System for Commercial Vehicle Based on Real-Time Calculation of Resistance

SAE International Journal of Commercial Vehicles

Wuhan University of Technology, China-Zhaocong Sun, Zhimin Li, Jinyi Xia, Gangfeng Tan
  • Journal Article
  • 02-12-03-0013
Published 2019-06-25 by SAE International in United States
When commercial vehicles drive in a mountainous area, the complex road condition and long slopes cause frequent acceleration and braking, which will use 25% more fuel. And the brake temperature rises rapidly due to continuous braking on the long-distance downslopes, which will make the brake drum fail with the brake temperature exceeding 308°C [1]. Meanwhile, the kinetic energy is wasted during the driving progress on the slopes when the vehicle rolls up and down. Our laboratory built a model that could calculate the distance from the top of the slope, where the driver could release the accelerator pedal. Thus, on the slope, the vehicle uses less fuel when it rolls up and less brakes when down. What we do in this article is use this model in a real vehicle and measure how well it works. Thus, to improve the safety and economy of commercial vehicles on mountainous areas, the Vehicle Speed Planning and Prompting System based on real-time calculation of resistance is established. The system consists of four parts: Hardware on Vehicle, Microcontroller Unit…
Datasets icon
Annotation icon
 

Braking Performance - Rubber-Tired, Self-Propelled Cranes

Cranes and Lifting Devices Committee
  • Ground Vehicle Standard
  • J1977_201902
  • Current
Published 2019-02-27 by SAE International in United States
This SAE Standard applies to machines as defined in Appendix A. Some of these machines can travel on-highway, but function primarily off-highway.
Datasets icon
Annotation icon
 

Off-Vehicle Brake Testing for Service Brakes Over 10000 Pounds GVW Air, Hydraulic, and Mechanical Actuation

Truck and Bus Brake Systems Committee
  • Ground Vehicle Standard
  • J2806_201901
  • Current
Published 2019-01-14 by SAE International in United States
Subject document is specifically intended for service brakes and service brakes when used for parking and/or emergency brakes (only) that are commonly used for automotive-type, ground-wheeled vehicles exceeding 4536 kg (10000 pounds) gross vehicle weight rating (GVWR). Subject specification provides the off-vehicle procedures, methods, and processes used to objectively determine suitability of tactical and combat ground-wheeled vehicle brake systems and selected secondary-item brake components (aka, aftermarket or spare parts), including brake “block” for commercial applications only, specifically identified within subject document. Subject specification is primarily based on known industry and military test standards utilizing brake inertia dynamometers. Targeted vehicles and components include, but may not be limited to, the following: a Civilian, commercial, military, and militarized-commercial ground-wheeled vehicles such cargo trucks, vocational vehicles, truck tractors, trailers, and specialized support and engineering equipment under the generic heading of ground vehicle “dry” brake systems (GVDBS). b Hydraulic, air, and mechanical “dry” disc brake and drum brake systems, when used as service brakes, including service brakes (only), when used as emergency and/or parking brakes. c Hydraulic, air, and…
Datasets icon
Annotation icon
 

Brake Pads, Lining, Disc, and Drum Wear Measurements

Brake Dynamometer Standards Committee
  • Ground Vehicle Standard
  • J2986_201901
  • Current
Published 2019-01-07 by SAE International in United States
This Recommended Practice provides a common method to measure wear of friction materials (brake pad assemblies and brake shoes) and their mating parts (brake disc or brake drum). These wear measurements apply to brakes fitted on passenger cars and light trucks up to 4536 kg of Gross Vehicle Weight Rating under the Federal Motor Vehicle Safety Standard (FMVSS), or vehicles category M1 (passenger cars up to nine occupants, including the driver) under the European Community’s ECE Regulations.
Datasets icon
Annotation icon
 

FMVSS 105 Inertia Brake Dynamometer Test Procedure for Vehicles Above 4540 kg GVWR

Truck and Bus Hydraulic Brake Committee
  • Ground Vehicle Standard
  • J2684_201812
  • Current
Published 2018-12-05 by SAE International in United States
This Recommended Practice is derived from the FMVSS 105 vehicle test and applies to two-axle multipurpose passenger vehicles, trucks, and buses with a GVWR above 4540 kg (10000 pounds) equipped with hydraulic service brakes. There are two main test sequences: Development Test Sequence for generic test conditions when not all information is available or when an assessment of brake output at different inputs are required, and FMVSS Test Sequence when vehicle parameters for brake pressure as a function of brake pedal input force and vehicle-specific loading and brake distribution are available. The test sequences are derived from the Federal Motor Vehicle Safety Standard 105 (and 121 for optional sections) as single-ended inertia-dynamometer test procedures when using the appropriate brake hardware and test parameters. This recommended practice provides Original Equipment Manufacturers (OEMs), brake and component manufacturers, as well as aftermarket suppliers, results related to brake output, friction material effectiveness, and corner performance in a laboratory-controlled test environment. The test sequences include different dynamic conditions (braking speeds, temperature, and braking history as outlined in the FMVSS 105);…
Datasets icon
Annotation icon
 

Physical and Virtual Simulation of Lightweight Brake Drum Design for Heavy Duty Commercial Vehicles Using Alternate Material Technologies

VE Commercial Vehicles Ltd.-Suresh Kumar Kandreegula, Himanshu Deshmukh, Shivdayal Prasad, Sonu Paroche, Ashesh Anil Shah
Published 2018-10-05 by SAE International in United States
Brake drum in commercial vehicles is very important aggregate contributing towards major weight in brake system module. The main function of brake drum is to dissipate kinetic energy of vehicle into thermal energy, as a results in braking operation major load comes on brake drum. Hence this is very critical component for vehicle safety and stability [1].Objective of this paper is to increase the pay load, which is utmost important parameter for commercial vehicle end customers. To achieve the light weighing target, alternate materials such as Spheroidal graphite iron (SGI) has been evaluated for development of brake drum. Many critical parameters in terms of reliability, safety and durability, thickness of hub, wheel loading, heat generation on drum, manufacturing and assembly process are taken into consideration. The sensitivity of these parameters is studied for optimum design, could be chosen complying each other’s values.Digital thermal performance evaluated in house, fine-tuned and verified by correlating with test data available for existing cast iron design and then applied for new design with alternate materials. In two different designs around…
Datasets icon
Annotation icon
 

Brake Fade Reduction in a Brake Drum System for Motorcycles

Hero Motocorp Ltd, India-Ramakanta Routaray
Published 2018-07-10 by SAE International in United States
In developing countries, motorcycles have become the most economically efficient choice for commuting. A variety of braking systems in motorcycles like Brake drum and Disk brake have once again become the deciding criteria for wise economic selection of a motorcycle. Due to the low cost of a brake drum compared with a disk brake, a median income group customer segment commonly prefers to buy the brake drum versions rather than disk brake. However the performance of the brake drum is inferior to the disk brake. One major inferior performance feature is brake fade.For a target customer segment, it always becomes a challenge for OEMs to provide the desired braking at sufficiently low costs for customers of that segment, while with the drum braking system, usually the user ends up with loss of brake effectiveness due to overheating, which in turn is produced by repeated braking actions.In this paper, a methodology to minimize brake fade was devised. By redesigning the brake drum (BD) for enhanced cooling effect, brake fade has been minimized.We have verified the results…
Datasets icon
Annotation icon
 

Automotive Gray Iron Castings

Metals Technical Executive Steering Committee
  • Ground Vehicle Standard
  • J431_201801
  • Current
Published 2018-01-09 by SAE International in United States
This SAE Standard covers the hardness, tensile strength, and microstructure and special requirements of gray iron sand molded castings used in the automotive and allied industries. Specific requirements are provided for hardness of castings. Test bar tensile strength/Brinell hardness (t/h) ratio requirements are provided to establish a consistent tensile strength-hardness relationship for each grade to facilitate prediction and control of tensile strength in castings. Provision is made for specification of special additional requirements of gray iron automotive castings where needed for particular applications and service conditions. NOTE—This document was revised in 1993 to provide grade specific t/h control. In 1999 the document was revised to make SI metric units primary. To better align the grading system with long established production methods and grades produced, the previous system of grading by fixed combinations of tensile strength and hardness was changed in 1999 to a system of grading by variable combinations of test bar t/h ratio and casting hardness grades. The number of hardness grades was increased relative to the number of previously available ranges to facilitate…
Datasets icon
Annotation icon
 

Brake Drum Qualification Recommended Practice

Truck and Bus Foundation Brake Committee
  • Ground Vehicle Standard
  • J2686_201710
  • Current
Published 2017-10-30 by SAE International in United States
This SAE Recommended Practice is intended for qualification testing for brake drums used on highway commercial vehicles with air brakes using an inertia-dynamometer procedure. This Recommended Practice consists of two distinct tests: Part A - durability and speed maintenance test, and Part B - heat check drag sequence test. Each test can be considered to be an independent evaluation of the brake drum which tests different properties.
Datasets icon
Annotation icon