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SAE International Journal of Commercial Vehicles
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Electric Vehicle Energy Consumption Simulation by Modeling the Efficiency of Driveline Components

SAE International Journal of Commercial Vehicles

Lappeenranta University of Technology-Mohammad Gerami Tehrani, Jussi Sopanen, Aki Mikkola, Kimmo Kerkkänen
Valmet Automotive Inc-Juuso Kelkka
  • Journal Article
  • 2016-01-9016
Published 2016-04-11 by SAE International in United States
The feasibility of improving the energy efficiency of Electric Vehicles (EV) by manipulating operation points by means of a variable transmission is investigated with an efficient mathematical model of power losses in all driveline components. Introduced model can be solved in real-time making it possible to embed it to a control scheme of EV. Empirical test results are employed to derive the efficiency of the power electronics and electric motor at operation points while the mechanical power losses are predicted by a comprehensive and generic formulation for efficiency analysis. The simulation model used comprises electrical component efficiency, drivetrain inertias, gearbox efficiency, regenerative braking, and gear ratio selection. Three different transmission types are studied in this work; a single reduction gear, a five-step gearbox and an Infinitely Variable Transmission.
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Evaluation of the Seat Index Point Tool for Military Seats

SAE International Journal of Commercial Vehicles

UMTRI-Sheila Ebert-Hamilton
University of Michigan-Matthew Reed
  • Journal Article
  • 2016-01-0309
Published 2016-04-05 by SAE International in United States
This study evaluated the ISO 5353 Seat Index Point Tool (SIPT) as an alternative to the SAE J826 H-point manikin for measuring military seats. A tool was fabricated based on the ISO specification and a custom back-angle measurement probe was designed and fitted to the SIPT. Comparisons between the two tools in a wide range of seating conditions showed that the mean SIP location was 5 mm aft of the H-point, with a standard deviation of 7.8 mm. Vertical location was not significantly different between the two tools (mean - 0.7 mm, sd 4.0 mm). A high correlation (r=0.9) was observed between the back angle measurements from the two tools. The SIPT was slightly more repeatable across installations and installers than the J826 manikin, with most of the discrepancy arising from situations with flat seat cushion angles and either unusually upright or reclined back angles that caused the J826 manikin to be unstable. The investigators who performed the measurements indicated that the SIPT was easier to use. The data show that the SIPT is a…
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Development of a 1kW Exhaust Waste Heat Thermoelectric Generator

SAE International Journal of Commercial Vehicles

Martin Cleary
Boise State University-Yanliang Zhang
  • Journal Article
  • 2016-01-1273
Published 2016-04-05 by SAE International in United States
Although the technology of combustion engines is reasonably well developed, the degree of efficiency is considerably low. Considerable amount of the energy of around 35 % is lost as exhaust waste heat, and up to 30 % is dissipated in the cooling circuits. Due to this, thermal recuperation has a great potential for raising the efficiency of combustion engines. In order to meet the ever-increasing consumer demand for higher fuel economy, and to conform to more stringent governmental regulations, auto manufacturers have increasingly looked at thermoelectric materials as a potential method to recover some of that waste heat and improve the overall efficiency of their vehicle fleets. Seeking new possibilities to make vehicles greener and more efficient, the industry wants to use the waste heat which passes through the exhaust system almost completely unused in the past. The combination of heat exchanger and thermoelectric material integrated into the vehicle environment results in high demands on design, size & dimensioning of the thermoelectric generator system. As a company specializing in the manufacture of exhaust systems for…
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Towards a Cyber Assurance Testbed for Heavy Vehicle Electronic Controls

SAE International Journal of Commercial Vehicles

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SAE International Journal of Transportation Cybersecurity and Privacy

Colorado State University-Indrakshi Ray, Subhojeet Mukherjee, Hossein Shirazi
Synercon Technologies-James Johnson
  • Journal Article
  • 2016-01-8142
Published 2016-09-27 by SAE International in United States
Cyber assurance of heavy trucks is a major concern with new designs as well as with supporting legacy systems. Many cyber security experts and analysts are used to working with traditional information technology (IT) networks and are familiar with a set of technologies that may not be directly useful in the commercial vehicle sector. To help connect security researchers to heavy trucks, a remotely accessible testbed has been prototyped for experimentation with security methodologies and techniques to evaluate and improve on existing technologies, as well as developing domain-specific technologies. The testbed relies on embedded Linux-based node controllers that can simulate the sensor inputs to various heavy vehicle electronic control units (ECUs). The node controller also monitors and affects the flow of network information between the ECUs and the vehicle communications backbone. For example, a node controller acts as a clone that generates analog wheel speed sensor data while at the same time monitors or controls the network traffic on the J1939 and J1708 networks. The architecture and functions of the node controllers are detailed. Sample…
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Enhancement of Vehicle Handling Based on Rear Suspension Geometry Using Taguchi Method

SAE International Journal of Commercial Vehicles

Anadolu Isuzu Automotive Industry.-Emre Sert
Istanbul Technical University.-Pinar Boyraz
  • Journal Article
  • 2015-01-9020
Published 2016-04-15 by SAE International in United States
Studies have shown that the number of road accidents caused by rollover both in Europe and in Turkey is increasing [1]. Therefore, rollover related accidents became the new target of the studies in the field of vehicle dynamics research aiming for both active and passive safety systems.This paper presents a method for optimizing the rear suspension geometry using design of experiment and multibody simulation in order to reduce the risk of rollover. One of the major differences of this study from previous work is that it includes statistical Taguchi method in order to increase the safety margin. Other difference of this study from literature is that it includes all design tools such as model validation, optimization and full vehicle handling and ride comfort tests.Rollover angle of the vehicle was selected as the cost function in the optimization algorithm that also contains roll stiffness and height of the roll center. In order to form the cost function, five different geometrical factors have been selected as design variables. The ultimate aim is to minimize the cost function…
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