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Next Generation Power Distribution Unit in Wiring Harness

Mahindra & Mahindra, Ltd.-Boobala Krishnan D, Himanshi Dua, T Vijayan, Apurbo Kirty
  • Technical Paper
  • 2019-28-2571
Published 2019-11-21 by SAE International in United States
With the exponential advancement in technological features of automobile’s EE architecture, designing of power distribution unit becomes complex and challenging. Due to the increase in the number of features, the overall weight of power distribution unit increases and thereby affecting the overall system cost and fuel economy. The scope of this document is to scale down the weight and space of the power distribution unit without compromising with the current performance.The concept of next generation power distribution unit in automobiles is achieved using miniaturization of its sub-components which involves replacing the mini fuses and JCASE fuses with LP mini and LP JCASE fuses respectively. The transition doesn’t involve any tooling modification and hence saves the tooling cost. Furthermore, to address stringent weight and space targets, LP mini fuses and LP JCASE fuses were further replaced with micro-2 fuse and M-case fuse respectively. Similarly, Micro relay and Mini relay were replaced with Ultra micro and high current micro relay respectively.We took MPV segment vehicle for our initial testing and validation and it has been observed to…
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Performance Gains of Load Sensing Brake Force Distribution in Motorcycles

Force Motors-Apurva Chakraborty
  • Technical Paper
  • 2019-28-2426
Published 2019-11-21 by SAE International in United States
Commercial motorcycles and scooters incorporate independent circuits for front and rear brake actuation, thus precluding load-dependent brake force distribution. In all cases of manual brake force modulation between the front and rear wheels, there is poor compensation for the changes in wheel loads on the account of longitudinal weight transfer, thus making it challenging to provide an adequate braking force to each wheel.The ratio in which the braking force should be distributed between the front and the rear wheels is dependent on the motorcycle’s geometry, weight distribution, mechanical sizing of braking system components, and is a variable based on the instantaneous deceleration. This connotes that a fixed bias of front and rear braking forces can be optimized only for a narrow range of motorcycle’s deceleration.Maximum braking performance occurs just prior to wheel lock-up, as a sliding tire provides less grip than a rolling tire. This is also the scenario when both the tires are doing the maximum work in decelerating the motorcycle. Therefore an optimal brake force distribution is one that locks both the wheels…
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Development of Low Cost Lifesaving System for Automotive Vehicles during Road Accidents

Tata Technologies, Ltd.-Sachin Madhukarrao Pajgade, Aashish Bhargava
  • Technical Paper
  • 2019-28-2460
Published 2019-11-21 by SAE International in United States
Vehicular accidents are life-threatening and result in fatal casualties in developing country such as India. According to estimates, traffic accidents kill more people in India than diseases like Cancer and AIDS. More than 150,000 people are killed every year in traffic accidents in India, which works out to 400 fatalities a day, far higher than developed auto markets like the U.S., which had logged about 40,000 deaths in 2016. The World Health Organization estimates road accidents cost most countries about 3 per cent of their gross domestic product.India being the fastest growing economy will be the world’s third-largest car market after China and the U.S. by 2020, according to automobile researchers.According to research study most of death cause due to not getting help on time to the injured person. Research has proven that if injured person is not found any option of help then they also lose the power to fight such critical situation due to psychological effect. When vehicle met accident, people are not getting on time support, this delay is the major cause…
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Cooperative Distribution Strategy of Regenerative Braking and Pneumatic Braking of an Electric Commercial Vehicle

Nanjing University of Science and Technology-Qing Cheng, Dawei Pi, Boyuan Xie, Hongliang Wang, Xianhui Wang
Published 2019-11-04 by SAE International in United States
This paper mainly proposes one type control strategy of the regenerative braking system of an electric commercial vehicle under normal braking condition. With the main goal of recovering as much energy as possible, the braking force distribution strategy based on maximum regenerative braking optimization is studied under the restriction of ECE regulation and state of charge (SOC) of battery. Firstly, the related models of the regenerative braking system and the target vehicle are separately established in MATLAB/Simulink. Then, the distribution strategy of braking force is developed and optimized considering the influence of SOC and vehicle speed respectively. Finally, the braking effects of this control strategy in the typical deceleration process are numerical simulated and analyzed. Simulation results depict that this control strategy can recover more braking energy under the premise of ensuring braking safety and great braking performance compared with the common braking strategies with traditional strategy and without regenerative braking.
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Polyurethane Foam Performances’ Influence on Body Pressure Distribution on an Automotive Seat

Changchun Faway Adient Automotive System Co., Ltd. Technical-Yanfei Wang, Li-Feng Xing, Yu-Qiang Huang
Published 2019-11-04 by SAE International in United States
From the microstructure point of view, the relationship of car seat comforts, including the static and dynamic comfort, and the polyurethane foam performance of its cushion has been analyzed. In this paper, polyurethane cushion performances associated with the seat static comfort have been mainly discussed. And their quantizing relation is obtained. How to apply the pressure gradient, one of body pressure distribution parameters, to optimize automobile seat comfort has been analyzed in detail. The findings suggest maximum and mean values of body pressures increase by 0.09 KPa and 0.04 KPa with the cushion foam hardness (Ph) increasing 1 KPa, respectively. The pressure gradient is little dependent on the cushion foam hardness within the range of Ph=4 ~ 5 KPa. Furthermore, the foam thickness under the hip should be greater 80 mm in order to reduce subcutaneous stresses under conditions of Ph= 6.2 KPa.
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Braking Control Strategy Based on Electronically Controlled Braking System and Intelligent Network Technology

China-Hongyu Zheng
Jilin University-Rui Li
Published 2019-11-04 by SAE International in United States
In order to solve the coupling problems between braking safety, economical efficiency of braking and the comfort of drivers, a braking control strategy based on Electronically Controlled Braking System (EBS) and intelligent network technology under non-emergency braking conditions is proposed. The controller utilizes the intelligent network technology’s characteristics of the workshop communication to obtain the driving environment information of the current vehicle firstly, and then calculate the optimal braking deceleration of the vehicle based on optimal control method. The strategy will distribute the braking force according to the ideal braking force distribution condition based on the EBS according to the braking deceleration; the braking force will be converted to braking pressure according to brake characteristics. Computer co-simulations of the proposed strategy are performed, the strategy is verified under different initial speeds. The results show that the strategy enables the vehicle to stop within a safe distance, keeps the brake deceleration as smooth as possible for better braking comfort while at the same time obtaining better braking economy by increasing braking efficiency under different initial speeds.
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CLAMP, LOOP, PLASTIC, WIRE SUPPORT

AE-8C2 Terminating Devices and Tooling Committee
  • Aerospace Standard
  • AS25281D
  • Current
Published 2019-10-29 by SAE International in United States
No Abstract Available.
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Uniform Reference and Dimensional Guidelines for Collision Repair

Motor Vehicle Council
  • Ground Vehicle Standard
  • J1828_201910
  • Current
Published 2019-10-28 by SAE International in United States
This SAE Recommended Practice defines, for vehicle manufacturers and collision information and equipment providers, the types of vehicle dimensional data needed by the collision repair industry and aftermarket equipment modifiers to properly perform high-quality repairs to damaged vehicles. Both bodyframe and unitized vehicles, including passenger cars and light trucks, are addressed.
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Paint and Trim Code Location

Motor Vehicle Council
  • Ground Vehicle Standard
  • J2235_201910
  • Current
Published 2019-10-24 by SAE International in United States
This SAE Recommended Practice is designed to provide readily accessible paint and trim code information on all passenger vehicles, lightweight trucks, and vans in a way that minimizes the time and effort required to locate and effectively use that information for body repair, parts ordering, vehicle maintenance, and information systems.
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Elastomer: Phenyl Methyl Vinyl Silicone (PVMQ) Low Temperature/Engine Oil Resistant High Strength/High Tear 55 to 65 Type “A” Hardness For Products in Aircraft Piston Engine Oil/Low Temperature Environments

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3346H
  • Current
Published 2019-10-24 by SAE International in United States
This specification covers a phenyl vinyl silicone rubber material that can be used to manufacture product in the form of sheet, strip, tubing, molded shapes, and extrusions. This specification should not be used for molded rings, compression seals, O-ring cord, and molded in place gaskets for aeronautical and aerospace applications without complete consideration of the end use prior to the selection of this material.
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