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2015-01-14
Technical Paper
2015-26-0117
Deepak Sharma, Sreenath K Reghunath, Ashwini Athreya
In the era of increasing the emission standards, hybrid technology is emerging to be the future mobility due to its reduced emissions and also for its fuel economy benefits. In Hybrid Vehicles, IC Engine sometimes operates in inferior efficiency points due to non-availability of secondary power unit support during low torque requirement. This happens due to lack of sufficient energy in the secondary energy storage system. The paper presents the concept of intelligent Stored Energy Control in Hybrid vehicles, utilizing the route information from the vehicle navigation system. Route terrain information is processed to analyze the future energy consumption pattern of the secondary unit. Based on the secondary power unit characteristics, a dynamic equivalent energy reserve calculation is done. The activation and deactivation of the secondary power unit is decided based on continuous monitoring of the level of stored energy and the reserve calculation.
2015-01-14
Technical Paper
2015-26-0042
Suresh Kumar Gurusamy, Chandrasekar Rajagopalan, R Sateesh Kumar, B Ashok
Abstract 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
Abstract 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, it's very important 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
Abstract This paper sketches a model based E/E-architecture analysis and design process for the development of distributed in-vehicle systems. Together with a model based system development, the sketched analysis and design process results in a cost-effective E/E-architecture which fulfills all the requirements for the developed in-vehicle system. As an example scenario, the integration of a new feature into a car, which requires integrating a new distributed function into the existing E/E-architecture of the car, is shown.
2015-01-14
Technical Paper
2015-26-0088
Prashant Daggolu, Anthony Joseph, Dinesh Kumar, R M Cursetji
Abstract Diesel exhaust is typically at lower temperature compared to gasoline exhaust and would need a catalyst that has activity in low temperature range to be effective. Hence considerable research has been directed to improve low temperature activity of catalysts used in diesel application. One of the aspects that has been widely reported in literature is that small Pt clusters have a positive effect on reducing the CO light off temperature (LOT). To examine this phenomenon closely, the present work was taken up to correlate Pt cluster size with performance. Catalysts were prepared on various supports - Alumina, Siliceous clay, ceria-zirconia, etc with different metal loadings and the calcinations conditions were varied both in time and temperature as well as calcinations atmosphere. The cluster sizes were ascertained using Phillips Tecnai 20 Transmission Electron Microscope.
2014-12-15
Standard
AS31021B
SCOPE IS UNAVAILABLE.
2014-12-12
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 125°C.
2014-12-11
Standard
AMS5629/H1000
This specification covers a corrosion-resistant steel in the form of bars, wire, forgings, flash welded rings, and extrusions in the solution and precipitation heat treated (H1000) condition. These products have been used typically for parts requiring corrosion resistance, stress-corrosion resistance, high strength up to 600 °F (316 °C), and good ductility and strength in the transverse direction in large section sizes, but usage is not limited to such applications.
2014-12-11
Standard
AMS5675H
This specification covers a corrosion and heat resistant nickel alloy in the form of welding wire.
2014-12-08
WIP Standard
AS12500
Establish minimum requirements for procedures, materials and systems for protecting electronic components and assemblies from adverse environments in commercial and government applications.
2014-12-08
Standard
AIR6112
This document provides an overview of EB technology as it applies to the aerospace fiber optic industry. Applicable personnel include: Managers, Engineers, Technicians, Logisticians, Trainers/Instructors, Third Party Maintenance Agencies, Quality Assurance
2014-12-05
Standard
AIR5444A
This SAE Aerospace Information Report (AIR) shall be limited to general information about tin whisker formation on tin plated conductors. It summarizes the mechanisms of metal whisker formation and describes possible conclusions as related to tin plated conductors. It also provides a number of reference documents that describes research and observations of the whisker phenomena, recommendations to prevent its formation and conclusions. The investigation by this task group of AE-8D was initiated by a request of the Naval Air Warfare Center, Indianapolis, Indiana, to determine if the phenomenon of tine whiskers is a problem in aerospace wire and cable.
2014-12-03
Standard
J2685_201412
This SAE Recommended Practice defines the test conditions, procedures, and performance requirements for PTC (positive temperature coefficient of resistance) overcurrent protection devices. PTCs are typically either polymeric (PPTC) or ceramic (CPTC). It is important to note battery voltages versus powernets/system voltage versus max battery voltages: (12 V/14 V/16 V, 24 V/28 V/32 V, and 36 V/42 V/58 V). All voltages are DC. These devices are typically rated with a maximum operating voltage, which for vehicular systems need to be 16 V (for 12 V batteries), 32 V (for 24 V batteries), and 58 V (for 36 V batteries/42 V powernets). PTC devices are considered to be self-resetting after responding to overcurrent conditions and after such condition has been removed from the affected circuit containing the PTC.
2014-12-01
Standard
AS5756/4B
SCOPE IS UNAVAILABLE.
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.
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