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Cable Impedance Calculations Employed in Designing Aerospace Electrical Power Systems

Astronics AES-Jon Fifield
  • Technical Paper
  • 2020-01-0037
To be published on 2020-03-10 by SAE International in United States
This paper presents design considerations in utilizing cable impedance calculations in the design of an aerospace electrical power system. (EPS) Past wiring design guidelines featured a tabular constructed single-point design reference. This results in a cable selection which adds unnecessary weight and under-utilized the wire’s performance ability when considering a vehicle’s design requirements. Present wiring design guidelines have lagged behind the growing movement to achieve an optimized wire selection. Understanding the shortfalls with past and present wiring design methods will improve future methods to comply with increasingly restrictive vehicle performance requirements. This paper will discuss two of the most important design requirements for future aerospace electrical power and distribution feeders, which are weight and thermal limits assigned to an EPS design.
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Sensor Fusion Concept for Improved Rotational Speed Measurement in Small Engines

Institute of Electrical Measurement and Measurement Signal P-Markus Neumayer, Thomas Bretterklieber, Thomas Suppan
  • Technical Paper
  • 2019-32-0519
To be published on 2020-01-24 by Society of Automotive Engineers of Japan in Japan
Future developments for small engines, e.g. engines for handheld working tools, like chain saws require the integration of ECU-systems for engine control. For small engines often only a rotational speed senor is available. The application of additional engine sensors is in many cases unwanted, e.g. due to cost aspects and additional wiring. The lack of sensor data requires tailored control strategies and signal processing techniques to infer information about the engine from the sensor data. E.g. for rotational speed sensors the Δω method has been proposed, where the load is estimated from the temporal variation of the rotational speed. This approach requires a rotational speed sensor with sufficient angular resolution. In this paper we present a simulation study for a sensor fusion concept to improve the temporal resolution of engine speed measurements for low cost engines by means of an additional vibration sensor. The rotational sensor of the engine is assumed to have insufficient resolution to determine variations of the rotational speed over an engine revolution. However, variations of the rotational speed of the engine…
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Marking of Electrical Insulating Materials

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • AS5942
  • Current
Published 2019-12-27 by SAE International in United States
This specification establishes the performance requirements for the identification of wire and cable by indirect markings that have been applied to electrical insulating materials including heat shrink sleeving, wrap around labels and “tie-on” tags as well as any other types of materials used for indirect marking. This specification covers the processes used to mark these materials, including impact ink marking, thermal transfer, hot stamp, and lasers, etc. This specification does not cover the direct marking on insulated electrical wires and cables.
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Wire, Electrical, Polyvinyl Chloride Insulated, Nylon Jacket, Tin-Coated Copper Conductor, Medium Weight, 600-Volt, 105 °C

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS50861/7A
  • Current
Published 2019-12-05 by SAE International in United States

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WIRE, ELECTRICAL, POLYVINYL CHLORIDE INSULATED, PVC-GLASS-POLYAMIDE, TIN-COATED COPPER CONDUCTOR, 600-VOLT, 105 °C

AE-8D Wire and Cable Committee
  • Aerospace Standard
  • AS50861/2A
  • Current
Published 2019-12-05 by SAE International in United States

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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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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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Electrical Connectors and Wiring, Compatibility of

AE-8C1 Connectors Committee
  • Aerospace Standard
  • AIR1329C
  • Current
Published 2019-11-12 by SAE International in United States
This SAE Aerospace Information Report (AIR) defines the areas where incompatibility may exist between the selected wire and the electrical connector in which it is terminated and how to design for compatibility. Refer to ARP914 for a glossary of connection terms.
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Q&A

Automotive Engineering: November/December 2019

  • Magazine Article
  • 19AUTP11_17
Published 2019-11-01 by SAE International in United States

Valeo is an industry leader in technologies essential to vehicle electrification and connected/automated driving. The French Tier 1 pioneered 48V mild-hybrid systems and is a major producer of e-hardware and software including belt-starter generators, power electronics, electric superchargers and traction motors. Valeo recently entered a collaboration with Dana Inc. to develop and supply electrified AWD systems featuring 48-V hybrid power. The first of these is scheduled to launch in volume in early 2020 with a major European OEM.

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SAE J2450 Supplemental Training Document

Vehicle E E System Diagnostic Standards Committee
  • Ground Vehicle Standard
  • J2450/1_201910
  • Current
Published 2019-10-31 by SAE International in United States
This supplement, which is a living document, is meant to provide both clients and translation suppliers with some suggestions for integrating SAE J2450 into their business practices. It is intended for the use of clients, trainers who wish to develop new evaluators, and those who wish to self-train.
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