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Snowmobile Brake Control Systems

Snowmobile Technical Committee
  • Ground Vehicle Standard
  • J1282_201902
  • Current
Published 2019-02-27 by SAE International in United States
This SAE Recommended Practice is intended to provide the minimum acceptable criteria for snowmobile hand brake control systems. This recommendation is not intended to cover competition vehicles, nor is it intended to limit development of new and/or improved technology in controls. Although these recommendations are primarily addressed to hand control systems using an outer flexible conduit with a multiple strand inner cable or hydraulic type brake control system, the basic requirements of freedom of movement, strength, material, etc., will apply to any system.
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A Braking Force Distribution Strategy in Integrated Braking System Based on Wear Control and Hitch Force Control

China FAW Group Corp.-Linlin Wang
Jilin University-Hongyu Zheng, Chen Liu
Published 2018-04-03 by SAE International in United States
A braking force distribution strategy in integrated braking system composed of the main braking system and the auxiliary braking system based on braking pad wear control and hitch force control under non-emergency braking condition is proposed based on the Electronically Controlled Braking System (EBS) to reduce the difference in braking pad wear between different axles and to decrease hitch force between tractors and trailers. The proposed strategy distributes the braking force based on the desired braking intensity, the degree of the braking pad wear and the limits of certain braking regulations to solve the coupling problems between braking safety, economical efficiency of braking and the comfort of drivers. Computer co-simulations of the proposed strategy are performed. The braking force distribution strategy is verified under condition of equal wear of braking pad, condition of greater wear on the front axle of tractor and condition of greater wear on the rear axle of the tractor. The simulation results show that the proposed strategy balanced the braking pad wear by regulating the braking cylinder pressure of each axle…
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Hydraulic Pressure Control and Parameter Optimization of Integrated Electro-Hydraulic Brake System

APG Group-Hui Miao, Zheng Tang Shi
Jilin University-Xiong Yang, Jing Li
Published 2017-09-17 by SAE International in United States
A general principle scheme of IEHB (Integrated Electro-Hydraulic Brake system) is proposed, and the working principle of the system is simply introduced in this paper. Considering the structure characteristics of the hydraulic control unit of the system, a kind of time-sharing control strategy is adopted to realize the purpose of independent and precise hydraulic pressure regulation of each wheel brake cylinder in various brake conditions of a vehicle. Because of the strong nonlinear and time varying characteristics of the dynamic brake pressure regulation processes of IEHB, its comprehensive brake performance is mainly affected by temperature, humidity, load change, the structure and control parameters of IEHB, and so on. Under certain temperature, humidity and load conditions, whether the matching of the structure and the control parameters of IEHB is appropriate or not, the brake performance of a vehicle would be affected directly and severely, and then the safe driving of a vehicle could not be guaranteed effectively. In order to enhance the adaptability of the pressure regulating performance of IEHB to external influence factors and improve…
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Service Maintenance of SAE J1703 and J1704 Brake Fluids in Motor Vehicle Brake Systems

Brake Fluids Standards Committee
  • Ground Vehicle Standard
  • J1707_201609
  • Current
Published 2016-09-13 by SAE International in United States
This SAE Recommended Practice provides basic recommendations for dispensing and handling of SAE J1703 and SAE J1704 Brake Fluids by Service Maintenance Personnel to assure their safe and effective performance when installed in or added to motor vehicle hydraulic brake actuating systems. This document is concerned only with brake fluid and those system parts in contact with it. It describes general maintenance procedures that constitute good practice and that should be employed to help assure a properly functioning brake system. Recommendations that promote safety are emphasized. Specific step-by-step service instructions for brake maintenance on individual makes or models are neither intended nor implied. For these, one should consult the vehicle manufacturer’s service brake maintenance procedures for the particular vehicle. Vehicle manufacturer’s recommendations should always be followed.
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Mechanical Systems Physics-of-Failure Analysis Experimental Validation

Ground Vehicle Reliability Committee
  • Ground Vehicle Standard
  • J2869_201608
  • Current
Published 2016-08-04 by SAE International in United States
This report details continuing work examining the fatigue life durability of a US Army Trailer. This report describes, through example, a process to evaluate and reduce the experimental data needed for a Mechanical Systems Physics-of-Failure analysis. In addition the report describes the process used to validate the computer simulation models.
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Rubber Boots for Drum-Type Hydraulic Brake Wheel Cylinders

Hydraulic Brake Components Standards Committee
  • Ground Vehicle Standard
  • J1604_201512
  • Current
Published 2015-12-17 by SAE International in United States
This SAE Standard covers molded rubber boots used as end closures on drum-type wheel brake actuating cylinders to prevent the entrance of dirt and moisture, which could cause corrosion and otherwise impair wheel brake operation. The document includes performance tests of brake cylinder boots of both plain and insert types under specified conditions and does not include requirements relating to chemical composition, tensile strength, or elongation of the rubber compound. Further, it does not cover the strength of the adhesion of rubber to the insert material where an insert is used. The rubber material used in these boots is classified as suitable for operation in a temperature range of −40 to +120 °C ± 2 °C (−40 to + 248 °F ± 3.6 °F).
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RISE OF THE UNDERDOGS

Mobility Engineering: June 2015

  • Magazine Feature Article
  • 15MEIP06_03
Published 2015-06-01 by SAE International in United States

Problem-plagued effort last year spurs Baja SAE team from VIT University of India to overhaul itself and its car.

This article isn't a thrilling discourse about engineering innovation and game-changing technology. It most definitely isn't a dramatic rags to riches story. Neither is it a satirical piece on the often erroneous experiments that make Baja SAE a fantastic platform for students to learn and thrive in the automotive industry.

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RISE OF THE UNDERDOGS

Momentum: April 2015

  • Magazine Feature Article
  • 15MOMP04_02
Published 2015-04-01 by SAE International in United States

Problem-plagued effort last year spurs Baja SAE team from VIT University of India to overhaul itself and its car.

THIS ARTICLE ISN'T A THRILLING DISCOURSE ABOUT ENGINEERING INNOVATION and game-changing technology. It most definitely isn't a dramatic rags to riches story. Neither is it a satirical piece on the often erroneous experiments that make Baja SAE a fantastic platform for students to learn and thrive in the automotive industry.

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Laser Surface Hardening of Ductile Irons

College of Engineering, Pune-M. J. Rathod, H. A. Deore
Published 2014-04-28 by The Automotive Research Association of India in India
Desired mechanical properties including wear resistance at affordable price are the key parameters for which ductile cast irons are widely selected. Particularly, in many automobile applications like brake cylinders, camshafts, connecting rods, gears, pistons and yokes ductile iron is used. Traditionally surface heat treatments like induction hardening and in recent times electron beam and laser hardening are used to improve wear and fatigue resistance of ductile irons. However, the laser surface hardening has a lot of advantages over others such as low distortion due to high power density, flexibility, accuracy, lack of quenching medium and limited grain growth.In this work, laser surface hardening of Ferrito pearlitic ductile iron grade has been carried out. Hardening was performed with a 400W continuous wave fiber laser with the objective to investigate the effect of local tempering in continuous laser multi-pass laser surface hardening on hardness profile of the specimen. Experiments were conducted by varying four process parameters namely power density, scanning speed, scan length and beam overlap. These process parameters were optimized. Surface characterizations of laser hardened samples…
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Mass Estimation and Axle Load Distribution Algorithm for EBS of Large Bus

Jilin Univ-Zhigen Nie, Changfu Zong, Ying Wan
Published 2013-04-08 by SAE International in United States
The paper describes an algorithm, which estimates the mass of large buses and axle load distribution using pedal position, wheel speed and the wheel cylinder pressure sensors. This algorithm is allowed to achieve the purpose without additional sensors by using the rotational speed sensors from ABS system and air pressure sensors in brake cylinders form ESP system.The axle load distribution algorithm mainly consists of three steps. Firstly, deceleration of the bus is estimated and then the mass of the bus is estimated. After that, the position of the mass centre is estimated. Taking account of the tire nonlinear characteristics under longitudinal forces and vertical forces, mass estimation, deceleration and the position of the mass centre of buses is corrected by the coefficient, which is determined by the wheel cylinder pressure, the wheel speed and mass estimation.When the deceleration, mass of the large bus and the mass center of the whole bus are completely estimated, load of each axle can be obtained through the formula, and also the optimal braking force of each axle for Electronically…
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