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Acceleration of Left Turning Heavy Trucks

Kineticorp LLC-David Danaher, Andrew Donaldson, Sean McDonough
  • Technical Paper
  • 2020-01-0882
To be published on 2020-04-14 by SAE International in United States
Accidents involving heavy trucks turning left across travel lanes of a roadway are common subjects of investigation in the field of accident reconstruction. The distance traversed during a turn and acceleration of the left turning heavy truck can be used to model its motion and determine timing as it relates to a collision. As a follow up to the 2019 SAE Accident Reconstruction section paper by the authors (2019-01-0411), this paper will investigate the longitudinal and lateral accelerations of heavy trucks during small, medium, and large radius turns and analyze peak and average lateral accelerations as they relate to turn radius and vehicle speeds.
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Impact of Mixed Traffic on the Energy Savings of a Truck Platoon

Auburn University-Patrick Smith, Mark Hoffman, David Bevly
National Renewable Energy Laboratory-Michael Lammert
  • Technical Paper
  • 2020-01-0679
To be published on 2020-04-14 by SAE International in United States
A two-truck platooning system was tested on a closed test track in a variety of realistic traffic and transient operating scenarios - conditions that truck platoons are likely to face on real highways. The fuel consumption for both trucks in the platoon was measured using the SAE J1321 gravimetric procedure as well as calibrated J1939 instantaneous fuel rate, serving as proxies to evaluate the impact of aerodynamic drag-reduction under constant-speed conditions. These measurements demonstrate the effects of: cut-in and cut-out maneuvers by other vehicles, transient traffic, the use of mismatched platooned vehicles (van trailer mixed with flatbed trailer), platoon following another truck with adaptive cruise control (ACC) and the presence of a multiple-passenger-vehicle pattern ahead of and adjacent to the platoon. These scenarios are intended to address the possibility of “background aerodynamic platooning” impacting realized savings on public roads. Using calibrated J1939 fuel rate analysis, fuel savings for curved track sections vs straight track sections was also evaluated for these scenarios. The presence of passenger-vehicle traffic patterns had a measurable impact on platoon performance, but…
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Primary and Auxiliary Seven Conductor Electrical Connector for Truck-Trailer Jumper Cable

Truck and Bus Electrical Systems Committee
  • Ground Vehicle Standard
  • J560_202002
  • Current
Published 2020-02-25 by SAE International in United States

This SAE Standard provides the minimum requirements for primary and auxiliary jumper cable plug and receptacle for the truck-trailer and converter dolly jumper cable systems for 12 VDC nominal applications. It includes the test procedures, design, and performance requirements.

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Self-driving trucks cut fuel consumption by 10%

SAE Truck & Off-Highway Engineering: February 2020

Ryan Gehm
  • Magazine Article
  • 20TOFHP02_12
Published 2020-02-01 by SAE International in United States

Enhancing safety and helping combat driver shortages are two benefits that heavy-duty autonomous-truck proponents have preached during development. You can now add significant fuel savings to the list.

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Modeling and Experiment of a Heavy-Duty Truck with an Improved Maxwell-Slip Model and IIRS Method

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Hefei University of Technology, China-Minyi Zheng
Hunan University, China-Bohuan Tan, Qingxi Xie, Bangji Zhang, Shaohua Wang
  • Journal Article
  • 10-04-01-0002
Published 2020-01-27 by SAE International in United States
Since vehicle structural flexibility and suspension nonlinearity are usually not considered, many existing vehicle models have difficulty in accurately describing the dynamic characteristics of the actual vehicle, which limits their practical applications. This article presents a rigid-flexible coupled system to investigate the dynamic behavior of a heavy-duty truck. An improved Maxwell-slip (IMS) model is proposed to describe the hysteresis nonlinearity of a leaf spring. In the coupled system, the axles and powertrain are simplified to be rigid, and the cab and frame are modeled using finite element method (FEM) considering their flexibility. During the solution process, the application of the FEM leads to a significant increase in the computer burden. Therefore, the iterated improved reduction system (IIRS) method is adopted to reduce the size of the large-size finite-element (FE) models to achieve the purpose of improving the calculation efficiency. Furthermore, the actual leaf spring and vehicle experiments are conducted to verify the accuracy of the proposed IMS model and full-vehicle model. Numerical simulations and experimental results show that the proposed IMS model can accurately describe…
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Power System for Hybrid Heavy-Duty Trucks

  • Magazine Article
  • TBMG-35804
Published 2020-01-01 by Tech Briefs Media Group in United States

Heavy-duty trucks such as 18-wheelers are virtually all powered by diesel engines. They account for a significant portion of worldwide greenhouse gas emissions but little has been done to curb their climate-change-inducing exhaust.

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Heavy-Duty Wiring Systems for On-Highway Trucks

Truck and Bus Electrical Systems Committee
  • Ground Vehicle Standard
  • J2202_201912
  • Current
Published 2019-12-03 by SAE International in United States
This SAE Recommended Practice provides general guidelines on the material selection, construction, and qualification of components and wiring systems used to construct nominal 12 VDC and/or 24 VDC electrical wiring systems for heavy-duty vehicles The guidelines are limited to nominal 12 VDC and/or 24 VDC primary wiring systems and includes cable sizes American Wire Gage 20 to AWG 4 on heavy-duty on-highway trucks. The document identifies appropriate operating performances requirements. This document excludes the male-to-female connection of the SAE J560 connectors.
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Heavy Dump Truck

  • Magazine Article
  • TBMG-35675
Published 2019-12-01 by Tech Briefs Media Group in United States

Mack Defense Allentown, PA 1 (800) 866-1177

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Countering the Destabilizing Effects of Shifted Loads through Pneumatic Suspension Design

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Virginia Tech, USA-Yang Chen, Mehdi Ahmadian
  • Journal Article
  • 10-04-01-0001
Published 2019-11-08 by SAE International in United States
This article proposes a novel approach to reduce the destabilizing impacts of the shifted loads of heavy trucks (due to improper loading or liquid slosh) by pneumatic suspension design. In this regard, the pneumatically balanced suspension with dual leveling valves is introduced, and its potential for the improvement of the body imbalance due to the shifted load is determined. The analysis is based on a multi-domain model that couples the suspension fluid dynamics, shifted-load impacts, and tractor-semitrailer dynamics. Truck dynamics is simulated using TruckSim, which is integrated with the pneumatic suspension model developed in AMESim. This yields a reasonable prediction of the effect of the suspension airflow dynamics on vehicle dynamics. Moreover, the ability of the pneumatic suspension to counteract the effects of two general shifted loads - static (rigid cargo) and dynamic (liquid) - is studied. The simulation results indicate that the dual-leveling-valve suspension results in a reduction in roll angle and roll rate of the vehicle body for both static and dynamic load-shifting cases, as compared to the conventional single-leveling-valve suspension. Suppression of…
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Divergence of Thickness Loss vs. Weight Loss, Friction and Wear Behavior of Heavy Truck Brake Blocks: Development of a New Test Procedure for the Chase Tester

Ask Automotive Pvt, Ltd.-Aman Rathee, Devendra Kumar Sharma, Shivraj Singh
SKR Consulting LLC-Seong Kwan Rhee
Published 2019-09-15 by SAE International in United States
Heavy truck brake blocks are found to swell (or expand) permanently during testing or usage, especially so at high temperatures, thus leading to longer durability as measured by thickness loss, similar to light vehicle disc pads. This swelling phenomenon occurs continuously in the layer adjacent to the friction surface during testing or usage; not a one time event. The thickness loss estimated from the weight loss is always greater than measured thickness loss. Brake block wear does not increase linearly with increasing normal load, and the load-sensitivity of block wear is very much dependent on the products. A new test procedure has been developed for generating friction-vs.-temperature and wear-vs.-temperature data at a constant temperature employing intermittent braking on the Chase Brake Lining Quality Tester (SAE J661) and friction material wear can be compared on equivalent-work basis.
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