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The effects of contamination on commercial trucks rear suspension springs durability

Ford Motor Company-Milton Monteverde Belli, Amilcar Tyrrell Tavares
Suspensys-Eugenio Noro, Graebin Matheus
  • Technical Paper
  • 2019-36-0083
Published 2020-01-13 by SAE International in United States
On current competitive scenario for road load transportation in Brazilian market, the operational costs should be reduced as much as possible. The suspension system commonly used on road commercial trucks is based on leaf spring use and Hotchkiss concept for axle locating devices. The use of leaf springs without bolt attachment eyelets are still common for rear suspension systems. When using the leaf spring with direct contact to the brackets, wear plates are placed between them to work as wear elements due to the friction between the parts. The friction will cause wear on the parts, and the wear plate is designed to suffer the damages of this friction instead of the leaf spring, being the cheapest element and can be easily replaced. When the system works on a severe contamination environment with high levels of grit and dirt, the degradation of the parts are accelerated. With a considerable amount of grit between the wear plate and the leaf spring, the damage caused on the leaf surface is increased and lead to a spring failure…
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Development challenges of hydraulic brakes for commercial vehicles

Volkswagen Truck & Bus-Narã Vieira Vetter, Antonio Carlos de Oliveira, Eduardo Henrique Souza Fontes, Felipe Nogueira, Guilherme Henrique Fonseca, Luis Fernando Nuss de Souza, Rodrigo de Oliveira dos Reis, Vangelo Cardoso Manenti
  • Technical Paper
  • 2019-36-0013
Published 2020-01-13 by SAE International in United States
The automotive research and development environment is increasingly challenging and complex, full of new technologies, regulations and customized customer needs. In addition, the cargo transportation market is very dynamic and competitive, becoming complex the strategies for companies in this segment. According to Anfavea (2018), this trend, especially in large urban centers, has driven the intention to use light commercial vehicles to capillize deliveries in destinations with a high demographic concentration and traffic limited to medium and heavy vehicles. In this scenario, the demand for diversified products is increasing in order to overcome the main tradeoff: “minimizing the size of the trucks and maximize the load capacity”. It brings the number of complex projects. The brake system is greatly impacted in these developments mainly because light commercial vehicles are situated in a weight range that we can call "identity crisis" if on the one hand they need an upgrade compared to a conventional car and use the hydraulic brake on the other one need a downgrade of a medium or heavy truck that brings robustness and…
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Truck Trailer Aerodynamic Design Optimization Through CFD Simulations

GM North America-Leonardo José Della Volpe
Imperial College London / NDF-USP-Filipe Fabian Buscariolo
  • Technical Paper
  • 2019-36-0103
Published 2020-01-13 by SAE International in United States
Cargo trucks are one of the most important and flexible ways of moving cargo within inlands. In some countries, such as Brazil, the economy relies on them to transport all kinds of products, from field and factory to consumer. In order to reduce freight prices, beside route optimization, truck manufactures started to focus on the aerodynamics development of those vehicles, in order to improve the efficiency, reducing fuel consumption and emissions. Although the truck aerodynamics development is important, most vehicles are not manufactured or don’t consider the truck trailer, which plays a key role in the full aerodynamics performance of the truck, once it might increase the front area and also change the overall aero performance.Considering the fact that only few Wind Tunnel facilities in the world are capable of testing a full truck with trailer, the use of Computational Fluid Dynamics (CFD) simulations for the evaluation of the full truck system became the best solution in order to improve the aerodynamic performance of those vehicles. The study here presented proposes the CFD evaluation of…
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Truck Tractor Power Outlet for Trailer ABS

Truck and Bus Electrical Systems Committee
  • Ground Vehicle Standard
  • J2247_201912
  • Current
Published 2019-12-17 by SAE International in United States

This SAE Recommended Practice identifies the minimum truck tractor electrical power output of the stop lamp and ABS (antilock brake system) circuits measured at the primary SAE J560 tractor trailer interface connector(s).

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Rolling Resistance Measurement Procedure for Passenger Car, Light Truck, and Highway Truck and Bus Tires

Highway Tire Committee
  • Ground Vehicle Standard
  • J1269_201912
  • Current
Published 2019-12-10 by SAE International in United States
This SAE Recommended Practice applies to the laboratory measurement of rolling resistance of pneumatic passenger car, light truck, and highway truck and bus tires. The procedure applies only to the steady-state operation of free-rolling tires at zero slip and inclination angles; it includes the following three basic methods:
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SAE Truck & Off-Highway Engineering: December 2019

  • Magazine Issue
  • 19TOFHP12
Published 2019-12-05 by SAE International in United States
Heavy-duty engine design What are the most significant factors influencing the way engine developers approach near-term design and development cycles? Two experts provide their insights from recent programs.Reducing winter range loss for electric trucks Researchers at the Austrian Institute of Technology have developed an air exchange system that's capable of reducing heat load by 37% in real-world tests.Narrower focus, bigger payoff Design teams are targeting focused markets for their commercial electric-vehicle programs to combat challenges like range and infrastructure.Removing complexity for autonomous trucks Narrowing the operating domains for driverless commercial vehicles reduces the requirements of autonomous technology and speeds time to market.Plastics innovations 2019 The 49th annual SPE Automotive Awards highlight the ongoing benefits of lightweight polymers and composites.Editorial Hop on the hydrogen highwayLeak testing of commercial-vehicle AC systems critical as move to HFO refrigerants loomsAkasol packs industry-leading energy density into new battery designMahle and partners develop super-efficient natural-gas engine for stationary powerHow battery technology will drive truck electrificationPlatinum nanoparticles for fuel-cell catalysts may cut costCaterpillar launches next-gen mini hydraulic excavator, skid steer and compact…
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Platinum nanoparticles for fuel-cell catalysts may cut cost

SAE Truck & Off-Highway Engineering: December 2019

Stuart Birch
  • Magazine Article
  • 19TOFHP12_11
Published 2019-12-01 by SAE International in United States

Fuel-cell technology is a big subject with some very small but vital aspects, one of which is the size of platinum atoms. Reduce these and the cost of platinum-one of the major drawbacks of current fuel-cell systems-would also fall. So, establishing and creating the optimum size for platinum fuel-cell catalysis for cars and heavy-duty trucks is one of the ongoing research areas for future alternative energy solutions.

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Q&A

SAE Truck & Off-Highway Engineering: December 2019

Ryan Gehm
  • Magazine Article
  • 19TOFHP12_13
Published 2019-12-01 by SAE International in United States

Together with its many partners, ZF supplies camera and radar technology and advanced components for both the passenger car and commercial truck markets, the latter being especially suited for the move to more complex driver-assistance systems, according to Dan Williams, director of ADAS & Autonomy at ZF. “The business case in commercial vehicle for reduction in driver hours of service, fuel cost reduction and safety have strong economic incentives to adopt ADAS/automated driving technology. Additionally, the regulations placed on the industry will require our customers to utilize certain solutions,” he said.

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Reducing winter range loss for electric trucks

SAE Truck & Off-Highway Engineering: December 2019

Paul Weissler
  • Magazine Article
  • 19TOFHP12_02
Published 2019-12-01 by SAE International in United States

Researchers at the Austrian Institute of Technology have developed an air exchange system that's capable of reducing heat load by 37% in real-world tests.

Battery-electric vehicle (BEV) range loss from winter use of PTC (positive temperature coefficient) heating has become a source of major concern as the industry works to make EVs a mainstream choice. Addressing this particular problem area with an economically viable solution was deemed a worthwhile effort by the Austrian Institute of Technology (AIT), which is jointly owned by the Austrian government and the Federation of Austrian Industries. A fleet test of electric delivery trucks is underway on European roads.

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Removing complexity for AUTONOMOUS TRUCKS

SAE Truck & Off-Highway Engineering: December 2019

Terry Costlow
  • Magazine Article
  • 19TOFHP12_04
Published 2019-12-01 by SAE International in United States

Narrowing the operating domains for driverless commercial vehicles reduces the requirements of autonomous technology and speeds time to market.

Developers of driverless trucks are eliminating some of the complexity of automated driving in hope of hastening time to market. They are limiting the nearly immeasurable scope of circumstances - the operating design domain (ODD) - that face driverless vehicles by deploying a variant of platooning, or narrowing the operational parameters for transporting goods. Driver shortages, growth in shipments of online purchases and the never-ending push to trim costs are among the factors that have led many to predict that commercial trucking will be an early adopter of autonomy.

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