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2015-01-14
Technical Paper
2015-26-0042
Suresh kumar Gurusamy, Chandrasekar Rajagopalan, Sateesh Kumar r, Ashok B
In present commercial vehicles, the cranking torque required for a heavy duty compression ignition engine is very high. This results in higher durability and reliability requirement of cranking system components and also makes it cumbersome to implement start-stop micro hybrid feature which requires more number of cranking cycles in lifetime. Hence higher capacity starter motor and battery is being used for implementing start-stop feature. However this would result in cost and packaging issues. In order to implement start-stop feature maintaining the same starter motor and battery capacity, the cranking energy demand of the engine needs to be reduced. Studies conducted shows that the major source of breakaway torque is the work done in compression stroke during a starting cycle.
2015-01-14
Technical Paper
2015-26-0137
Himanshu Agrawal, Abhishek Arun Kakade, Arun Kumar Singh, Sandeep N Shetty
Fan is generally used for cooling of alternator and an undesirable side effect of these fans is generation of flow induced noise. With stricter regulations and growing importance on acoustic comfort in present day market, its very important for companies to address flow induced noise problems early in product development stage. With physical testing, it would not be possible to get information on source strengths thus, limiting its usage. Whereas simulation on the other hand would be able to provide source strengths, directivity pattern and source ranking. This paper focuses on numerical simulation of alternator’s fan for prediction of air- borne noise. For this purpose, Computational Fluid Dynamics (CFD) based transient analysis is performed with high fidelity turbulence model using commercial software package, ANSYS Fluent. Ffowcs Williams and Hawkings (FW-H) model is used for modeling sound propagation.
2015-01-14
Technical Paper
2015-26-0012
Torben Mielke, Mircea Negrean, Wei Lu, Jonas Rox, Jan Gacnik
Modern distributed electronic vehicle systems like advanced driver assistance systems are unique selling points for modern cars. These systems integrate different vehicle domains and existing components. When implementing such new billable features, it is the key to change the existing E/E-architecture only where it is mandatory, to avoid unnecessary additional cost per unit. To minimize the required changes to the existing hardware platform when integrating new functionality, vehicle manufacturers need to have in-depth knowledge of their E/E-architecture. This knowledge allows designing distributed systems which can be integrated cost-effectively (i.e. with the least amount of changes) into the existing E/E-architecture. With modern vehicle architectures featuring several bus technologies (e.g. CAN, LIN, FlexRay, Ethernet) and several dozens of E/E-components, the required in-depth knowledge of such architectures can only be achieved using model-based analysis and design techniques.
2014-11-25
WIP Standard
AIR5464A
Over the past decade several metal clad fibers and fabrics have been developed to provide aerospace vehicle designers with a conductive, lighter weight alternative to coated copper or steel for shielding and harness overbraids of electrical cables. Several of these candidates have been unable to provide the strength or thermal stability necessary for the aerospace environment. However, the aramid-based products have shown remarkable resistance to the rigorous environment of aerospace vehicles. Concurrent with these fiber developments, there have been changes in the structures of aerospace vehicles involving greater use of nonmetallic outer surfaces. This has resulted in a need for increased shielding of electrical cables which adds substantial weight to the vehicle. Thus, a lighter weight shielding material has become more critical to meet the performance requirements of the vehicle.
2014-11-24
Standard
J2698_201411
1.1 This SAE Recommended Practice covers the design and application of primary on-board wiring distribution system harnessing for surface vehicles. This document is intended for single phase nominal 120 VAC circuits that provide power to truck sleeper cab hotel loads so that they may operate with the main propulsion engine turned off. The power supply comes from alternative sources such as land-based grid power, DC-AC inverters and auxiliary power generators. The circuits may also provide power to improve vehicle performance through charging batteries or operating cold-weather starting aids. 1.2 This document is not intended to provide guidance for electric or hybrid electric vehicle wiring circuits. Refer to SAE J1673 for high voltage automotive wiring assembly design. 1.3 Engine block heaters are 120 VAC devices that are used on a multitude of vehicle platforms in addition to trucks with sleeper cabs. Generally, the engine block heater circuit is wired independent of hotel loads.
2014-11-20
Standard
ARP1308D
The intent of this ARP is to identify electrical connectors maintained by the AE-8C1 Committee, to provide their general application characteristics, associated configuration options, and recommendations for new design (see 6.1.1), repair, and retrofit purposes (see 6.1). It is acknowledged the connectors listed herein will not completely satisfy all mobility vehicle and equipment requirements, but optimization of the use of these components will facilitate standardization in the form of maximum utilization of a minimum variety of connectors. This ARP only pertains to AS connector standards. See MIL-STD-1353 for U.S. military specification connector information.
2014-11-12
Magazine
Harley-Davidson's e-bike shocker (video) Is the motorcycle market ready for a Harley-Davidson EV? Project LiveWire was designed to provide answers, said Chief Engineer Jeff Richlen. Airbus has its eye on the future of cleaner flight CleanSky 2 targets are to increase aircraft fuel efficiency enough to reduce CO2 emissions by 20-30% and reduce aircraft NOx and noise emissions by 20-30% compared to newly designed aircraft entering into service in 2014-or essentially halve 2005 CO2 emissions levels by 2050. Soul EV extends the range frontier (video) Specially formulated NCM battery cells are key in giving the vehicle class-leading EV range while enabling engineers to fit a high-energy-density battery pack underfloor with little sacrifice of passenger cabin space.
2014-11-11
Technical Paper
2014-32-0027
T Manikandan, S Sarmadh Ameer, A Sivakumar, Samaraj Dhinagar
Abstract The proposed paper is on electrical energy conservation in a two wheeler. Electrical energy generation adds a 12% load torque on an engine and hence saving electrical energy would ultimately reduce the consumption of fuel. Load Control Module (LCM) is a single intelligent device which is placed in between electrical energy generation and consumption. The module controls and distributes energy to the corresponding loads depending on parameters like battery voltage, engine RPM, overhead light illumination levels and load usage time. The module prioritizes battery charging for prolonging the life of the battery. The Module has a microcontroller and load drivers and it is programmed with a novel algorithm for prioritization and energy distribution with respect to input conditions.
2014-11-11
Standard
AS22520/31
Scope is unavailable
2014-11-11
Journal Article
2014-32-0107
Takahiro Masuda, Kouji Sakai, Yuki Yamaguchi, Jun-ichi Kaku, Hirobumi Nagasaka
Abstract This paper proposes a novel engine starter system composed of a small-power electric motor and a simple mechanical valve train. The system makes it possible to design more efficient starters than conventional systems, and it is especially effective to restart engines equipped with idling stop systems. Recently, several idling stop systems, having intelligent start-up functions and highly-efficient generate capabilities have been proposed for motorcycles. One of challenges of the idling stop systems is the downsizing of electric motors for starting-up. However, there are many limitations to downsize the electric motors in the conventional idling stop systems, since the systems utilize the forward-rotational torque of the electric motors to compress the air-fuel mixture gas in the cylinders.
2014-11-10
WIP Standard
AS28937A
No scope available.
2014-11-10
WIP Standard
AS28938A
No scope available.
2014-11-05
WIP Standard
AIR5601A
This SAE Aerospace Information Report (AIR) is devoted to the challenges of applying optics to new advanced RF analog systems only; digital data link applications are covered elsewhere in protocol/architecture specific documents like Fibre Channel, ATM, Ethernet, Sonet, etc.
2014-11-03
WIP Standard
AS53731A
This specification covers fuse holders for use in aircraft electric circuits in conjunction with MIL-F-5372 current limiter type fuses. These fuse holders are suitable for operation at -54 to 125C.
2014-10-30
Standard
AS90387C
Scope is unavailable.
2014-10-27
Standard
AS22759C
AS22759 specification covers fluoropolymer-insulated single conductor electrical wires made with tin-coated, silver-coated, or nickel-coated conductors of copper or copper alloy as specified in the applicable detail specification. The fluoropolymer insulation may be polytetrafluoroethylene (PTFE), fluorinated ethylene propylene (FEP), polyvinylidene fluoride (PVF2), ethylene-tetrafluoroethylene copolymer (ETFE), or other Fluoropolymer resin. The fluoropolymer may be used alone or in combination with other insulation materials. These abbreviations shall be used herein. When a wire is referenced herein, it means an insulated conductor (see 7.7).
2014-10-27
Standard
AS24000A
Scope is unavailable.
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