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Brake System Thermal Performance for Brazil Market Battery Electric Vehicles

General Motors, LLC-David Antanaitis
  • Technical Paper
  • 2019-36-0019
Published 2020-01-13 by SAE International in United States
The discussion in the braking industry that has been ongoing for over a decade now on how to specify brake systems for regenerative-brake intensive vehicle applications has intensified considerably in the past few years as the automotive industry ponders a future where electric vehicles become predominant. Major automotive manufactures have announced plans to create dedicated electric-only vehicle architectures, from which to offer a full range of electric vehicle configurations. The time to really figure out the translation of Voice of the Electric Vehicle Customer to technical requirements and brake system content is approaching very rapidly. One of the major design decisions in the brake system is the sizing of foundation brake components for thermal performance. There is no question that regenerative brakes can significantly reduce the demand on the friction brakes in normal usage, sometimes by a full order of magnitude or more. Brakes no longer need to be sized for everyday use, rather, the sizing is driven by “limit cases” such as failure of the regen system, a full state of charge in the…
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CASE STUDY: RELATION BETWEEN LOADS AND ENGINE MOUNTS STIFFNESS VARIATION APPLIED ON MID SIZE TRUCK

General Motors Mercosul-Marcos Rogério Sanches Barbetti, Fernando Braga, Luiz Carlos Sá, Rafael Tedim Terra
  • Technical Paper
  • 2019-36-0094
Published 2020-01-13 by SAE International in United States
This Paper has as objective to present a study about how the stiffness variation can affect the powertrain mounts system loading. The initial driver for this research is to find enablers to improve the durability performance through loads reduction without noise and vibration degradation.In this study, we will review a summary about powertrain mounts main characteristics to help the understanding how to establish the static and dynamic characteristics, with the external excitations originated from durability track as well the engine torque applied over the system.We used the mid-size truck as physical hardware and the required load data were collected through load cells installed on the powertrain mount system.The load data were analyzed individually per mount and split over the three axles (X, Y and Z). As control factor, we applied different stiffness or “tunings” on the mount rubber body and as result, we established the relation between stiffness and powertrain mounts system loading.The presented graphic results show the load behavior along the durability tracks, it is possible to understand and establish the relation between loads…
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CONTACTS, ELECTRICAL CONNECTOR, PIN, CRIMP REMOVABLE, THERMOCOUPLE (FOR MIL-DTL-38999 SERIES I, II, III, AND IV, MIL-DTL-24308, AND MIL-DTL-83733)

AE-8C1 Connectors Committee
  • Aerospace Standard
  • AS39029/87A
  • Current
Published 2020-01-07 by SAE International in United States
No Abstract Available.
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CONTACTS, ELECTRICAL CONNECTOR SOCKET, CRIMP REMOVABLE, THERMOCOUPLE (FOR MIL-DTL-38999 SERIES I, III, IV CONNECTORS)

AE-8C1 Connectors Committee
  • Aerospace Standard
  • AS39029/88A
  • Current
Published 2020-01-07 by SAE International in United States
No Abstract Available.
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ACCESSORY, F ADAPTER, ROTATABLE, CONNECTOR, ELECTRICAL, CIRCULAR, HIGH DENSITY, QUICK DISCONNECT, ENVIRONMENT RESISTING, TYPE 1, (SERIES 1 OR 2)

AE-8C1 Connectors Committee
  • Aerospace Standard
  • AS81511/13
  • Current
Published 2019-12-26 by SAE International in United States
No Abstract Available.
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Lubricant Impact on Friction by Engine Component: A Motored Friction Tear Down Assessment of a Production 3.6L Engine

Ricardo Inc.-Stephen Cakebread
Ricardo UK Ltd-Phil Carden, Andrew de Vries
  • Technical Paper
  • 2019-01-2239
Published 2019-12-19 by SAE International in United States
Worldwide, Fuel Economy (FE) legislation increasingly influences vehicle and engine design, and drives friction reduction. The link between lubricant formulation and mechanical friction is complex and depends on engine component design and test cycle. This Motored Friction Tear Down (MFTD) study characterizes the friction within a 3.6L V6 engine under operating conditions and lubricant choices relevant to the legislated FE cycles. The high-fidelity MFTD results presented indicate that the engine is a low-friction engine tolerant of low viscosity oils. Experiments spanned four groups of engine hardware (reciprocating, crankshaft, valvetrain, oil pump), five lubricants (four candidates referenced against an SAE 0W-20) and five temperature regimes. The candidate lubricants explored the impact of base oil viscosity, viscosity modifier (VM) and friction modifier (FM) content. The results indicate that (i) a prototype SAE 0W-8 fluid generated the largest overall reduction in friction, (ii) the valvetrain group responded well to FM content, and (iii) an SAE 0W-20 with alternative VM performed remarkably well at low temperatures (-7°C to 30°C). In order to understand the significance of that engine friction…
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New CO2 / Fuel Consumption Certification Cycles and Design Implications for Fuel Efficient Lubricants

Nissan Motor Co., Ltd.-Takumaru Sagawa, Sachiko Okuda
TOTAL Marketing & Services-Gautier Burette, Khalid Ait Hammou, Mickaël Debord, Loïc Marlière
  • Technical Paper
  • 2019-01-2367
Published 2019-12-19 by SAE International in United States
During this decade, the constant increase and globalization of passenger car sales has led countries to adopt a common language for the treatment of CO2 and other pollutant emissions. In this regard, the WLTC - World-wide harmonized Light duty Test Cycle - stands as the new global reference cycle for fuel consumption, CO2 and pollutant emissions across the globe.Regulations keep a constant pressure on CO2 emission reduction leading vehicle manufacturers and component suppliers to modify hardware to ensure compliance. Within this balance, lubricants remain worthwhile contributors to lowering CO2 emission and fuel consumption. Yet with WTLC, new additional lubricant designs are likely to be required to ensure optimized friction due to its new cycle operating conditions, associated powertrain hardware and worldwide product use.Through friction torque and vehicle test campaigns, NISSAN and TOTAL have conducted a complete study to assess particularly how the Fuel Economy (FE) lubricants originally designed for JC08 (official Japanese driving cycle) or NEDC (New European Driving Cycle) will perform on the new WTLC.Beyond this initial state of art, the study was designed…
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Streamlining Post-Processing in Additive Manufacturing

  • Magazine Article
  • TBMG-35666
Published 2019-12-01 by Tech Briefs Media Group in United States

Undoubtedly there are many benefits associated with the use of additive manufacturing (AM) as a production technology. On a pan-industrial basis, manufacturers exploit the fact that through the use of AM they can not only build complex parts, in one piece, which were previously impossible, but they can also build stronger, lighter-weight parts, reduce material consumption, and benefit from assembly component consolidation across a range of applications. These advantages have all been well documented during the last 10-20 years as AM has emerged as a truly disruptive technology for prototyping and production, and are invariably seen as being enabled by the additive hardware that builds the parts. In reality, however, this is a partial picture, particularly for serial production applications of AM. AM hardware systems are actually just one part – albeit a vital part – of an extensive ecosystem of technologies that enable AM, both pre- and post-build.

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Streamlining Post-Processing in Additive Manufacturing

Aerospace & Defense Technology: December 2019

  • Magazine Article
  • 19AERP12_04
Published 2019-12-01 by SAE International in United States

Undoubtedly there are many benefits associated with the use of additive manufacturing (AM) as a production technology. On a pan-industrial basis, manufacturers exploit the fact that through the use of AM they can not only build complex parts, in one piece, which were previously impossible, but they can also build stronger, lighter-weight parts, reduce material consumption, and benefit from assembly component consolidation across a range of applications. These advantages have all been well documented during the last 10-20 years as AM has emerged as a truly disruptive technology for prototyping and production, and are invariably seen as being enabled by the additive hardware that builds the parts. In reality, however, this is a partial picture, particularly for serial production applications of AM. AM hardware systems are actually just one part - albeit a vital part - of an extensive ecosystem of technologies that enable AM, both pre- and post-build.

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Self-Expressive & Self-Healing Closures Hardwares for Autonomous & Shared Mobility

General Motors Technical Center India-Vijayasarathy Subramanian, Biju Kumar, Masani Sivakrishna, Anandakumar Marappan
  • Technical Paper
  • 2019-28-2525
Published 2019-11-21 by SAE International in United States
Shared Mobility is changing mobility trends of Automotive Industry and its one of the Disruptions. The current vehicle customer usage and life of components are designed majorly for personal vehicle and with factors that comprehend usage of shared vehicles. The usage pattern for customer differ between personal vehicle, shared vehicle & Taxi. In the era of Autonomous and Shared mobility systems, the customer usage and expectation of vehicle condition on each & every ride of vehicle will be a vehicle in good condition on each ride. The vehicle needs systems that will guide or fix the issues on its own, to improve customer satisfaction. We also need a transformation in customer behavior pattern to use shared mobility vehicle as their personal vehicle to improve the life of vehicle hardwares & reduce warranty cost. We will be focusing on Vehicle Closure hardware & mechanisms as that will be the first and major interaction point for customers in vehicle. This gives us an opportunity to improve product life and customer experience in ride share and shared mobility…
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