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Viewing 31 to 60 of 21089
2015-01-14
Technical Paper
2015-26-0109
Prashant Kumar Sharma, Suryanarayanan V, Pradeep Paulraj, Vasudeo Ganesh Halbe, Senthur Pandian
As the number of vehicles and environment pollution is increasing day by day, the emission regulation gets more stringent by the emission regulation authorities. Oxides of Nitrogen gases are one of the most harmful emissions from the IC Engines. In EURO 5 regulation NOx emission value is 0.18g/km for passenger cars which is further reduced to 0.08 g/km in EURO 6 regulation for CI engines. In order to achieve these NOx limits SCR (Selective Catalytic Reduction) technology is used for CI engines. In SCR technology the reduction of NOx is done through aqueous urea solution injected in exhaust stream. The composition of aqueous urea solution is 62.5% water and 32.5% is urea. After injection, this aqueous urea solution disintegrated into Ammonia and carbon dioxide by Thermolysis and Hydrolysis.
2015-01-14
Technical Paper
2015-26-0101
Arun Sivasubrahmaniyan, Abhishek Kumar Jaishwal, Girish R Warrier, Sriram T, Kalyan Hatti
A methodology for design and development of On-Board Diagnostic system II (OBD II) is derived with an objective to improve current reliability process in order to ensure design & quality of the system as per the requirement of commercial vehicle technology. This paper will give an overview of approach to the development of OBD II design concept / strategy as per requirement for variants of vehicles & engines keeping India specific design critique with regulatory requirements, compilation of design & development plan with supplier as a partner using a reliability tool DFMEA, DVVP & On road trials or vehicle level test. Paper will include, format of DFMEA, DVVP and vehicle level test results used during the development of OBD II.
2015-01-14
Technical Paper
2015-26-0102
Dhaval Dhruv, Sribathy Thirumavalavan, Manoj Kumar Thangamaniraj, Vinodhkumar Vellaichamy
To meet OBD norms for oxygen sensor component in exhaust path, there are various methods developed to monitor health of the same in engine management system. Here a new diagnosis strategy for oxygen sensor response is proposed, mainly applicable for start-stop vehicles. This diagnosis strategy is executed during the change in engine running state to engine stop state of vehicle due to start-stop feature. In general, before the engine stop is triggered, the lambda in the engine can be rich or lean; then when engine is stopped, fuel injection is cut-off and lambda in the engine becomes “infinitely lean” or only air passes through. Due to inertia of engine rotation after fuel cut-off, this air is still passed across oxygen sensor in exhaust path. So here are two transitions of lambda changes can be realized by oxygen sensor signal during engine running to engine stop, i.e. rich to infinitely lean and lean to infinitely lean.
2015-01-14
Technical Paper
2015-26-0103
Anders Widd, Magnus Lewander
The Euro IV legislation for heavy-duty on-road vehicles enforces emissions limits on the tailpipe NOx levels during both transient and modal testing, typically paired with additional limitations on, for example, ammonia emissions. There are several possible strategies for complying with the legislation, including engine management measures as well as after-treatment in the form of catalytic removal of NOx with ammonia as the reducing agent. A range of important aspects are presented and discussed, with both overall system performance and the installation and operational costs in mind. Factors relevant for future legislations, in the form of EU V and beyond, are also discussed. Operating the engine with high levels of EGR is a possible path to EU IV compliance with no or little catalytic NOx reducing after-treatment. Here, it is contrasted against an SCR-only solution based on a non-EGR engine calibration.
2015-01-14
Technical Paper
2015-26-0104
Santhoji Katare, Carolyn Hubbard, Seha Son
Aftertreatment system design involves multiple trade-offs between engine performance, fuel economy, regulatory emission levels, packaging, and cost. Selection of the best design solution (or “architecture”) is often based on an assumption that inherent catalyst activity is unaffected by location within the system. However, this study acknowledges that catalyst activity can be significantly impacted by location in the system as a result of varying thermal exposure, and this in turn can impact the selection of an optimum system architecture. Vehicle experiments with catalysts aged over a range of mild to moderate to severe thermal conditions that accurately reflect select locations on a vehicle were conducted on a chassis dynamometer. The vehicle test data indicated CO and NOx could be minimized with a catalyst placed in an intermediate location.
2015-01-14
Technical Paper
2015-26-0105
Prakash Kamat, Yogesh Aghav, Nitin Gokhale, M N Kumar
An innovative Diffusive Air Jet (DAJ) Combustion Chamber concept has been introduced in the present work. The DAJ Combustion Chamber design is based on the study of rate of heat release (ROHR) curve and its correlation with emission generation. The objective is to lower trade-off between NOx and soot without sacrificing fuel economy of Direct Injection (DI) diesel engine. DAJ Combustion Chamber modifies ROHR curve to the desired one so that it lowers engine out emissions. To study its effect a large bore, six cylinder engine with mechanical fuel injection system has been used. Three dimensional simulation software is used for the model calibration of basic reentrant cavity. Local emissions and ROHR curve have been studied using reentrant cavity shape. It has been modified to DAJ Combustion Chamber using Air Jet Chambers (AJCs). AJCs are positioned in the three dimensional model in such a way that it attacks local in-cylinder emissions.
2015-01-14
Technical Paper
2015-26-0106
Amartya Ghosh, Vasudevan C, Senthur Pandian, Sachin gogia
With the implementation of stringent PM emission norms in various countries for diesel vehicles, the legislation demands a PM mass limit as low as 5mg/km in the NEDC cycle starting from Euro5. This makes the usage of Diesel particulate filters (DPF) mandatory. The same is going to be mandated for upcoming BSV emission norms in India. Now, the major challenges for DPF technology adaptation are: 1) Soot mass estimation and loading for the DPF 2) DPF Regeneration - Process involving soot mass burning inside a DPF(temperature based/ under fuel post injection) This paper deals with the most important aspect of the regeneration of DPF – Regeneration Interval and factors affecting the same. Regeneration interval: kilometers of driving a vehicle after which the DPF will reach the maximum limit of soot mass present inside it.
2015-01-14
Technical Paper
2015-26-0107
Moqtik Ashok Bawase, Amita Baikerikar, M R Saraf
Airborne particulate matter (PM) in an urban atmosphere is a result of contribution from diverse range of source including domestic, industry and vehicles. PM emission is a matter a concern due to its multiple impacts on public health, air quality, and global climate. Ever increasing number of vehicles plying on the road is considered to be one of the major sources of PM. Particles in gasoline and diesel vehicle exhaust carry distinctive combinations of certain chemical compounds. Prominence of their chemical signature in ambient particulate matter can be considered as a direct indication of their relative importance as sources of emissions. In this study, Chemical speciation data of vehicle exhaust PM is analyzed and vehicle category wise distribution of carbon fractions is presented for different engine technologies and fuel types.
2015-01-14
Technical Paper
2015-26-0108
Vijay Narkhede, Dinesh Kumar, R M Cursetji, Touquire A Sidiquie
Diesel engines are becoming increasingly popular because they are inherently more fuel efficient. While the CO and HC impurities are significantly lower than in gasoline engines, the design strategy for reduction of Particulate Matter and Nitogen Oxides remains a major challenge for environmental catalysis. The catalyst system of choice with BS 3 fuel with 350 ppm of S available in most parts of the country, is the Vanadia Tungsten Titania (VWT) system which is resistant to poisoning by the S in the fuel.However under urban driving conditions on Indian roads, the major obstacle is the low engine out temperatures which are below the normal operating window (250 to 400 C) for VWT – SCR. The objective of the present investigation is to develop low temperature SCR catalyst systems that outperform the existing commercial catalytic systems during the cold start and low load conditions.
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.
2014-11-20
Standard
ARP739A
This ARP is intended to promote better understanding of gas system characteristics and operation in order to aid in system selection and design. Various gas systems are classified in a broad sense, component operation is described in moderate detail, pertinent design parameters are discussed, and possible modes for system operation are listed.
2014-11-20
Standard
EIA649_1
This document applies to hardware and software and provides CM requirements to be placed on contracts after being tailored by the Acquirer. The requirements have been organized by the following five CM functions: a. Configuration Planning and Management b. Configuration Identification c. Configuration Change Management d. Configuration Status Accounting e. Configuration Verification and Audit
2014-11-19
Article
Technology developed by Tech Mahindra for vehicle-to-infrastructure and vehicle-to-vehicle communication provides a blueprint for creating a gateway that will help achieve seamless V2X mobility.
2014-11-18
Article
Scientists at Fraunhofer have developed a high-resolution magnetic line camera to measure magnetic fields in real time, which is particularly useful for quality assurance during the manufacture of magnets.
2014-11-18
Article
Potential exists for more efficient re-use of rare earth elements, Purdue professor asserts. Regardless of choice, original component design should be engineered for dismantling to enhance end-of-life recovery, he tells Automotive Aftermarket Industry Week forum in Las Vegas.
2014-11-18
WIP Standard
J1779
The marine environment differs greatly from other environments in which hydraulics are used. This Recommended Practice provides hydraulic design considerations and criteria for the marine environment and is applicable to commercial vessels, military ships, and submersible vehicles. This document may be used for manned and un-manned vehicles.
2014-11-18
Magazine
Oil debris monitoring in aero engines In a gas turbine engine, small particles or "chips" are generated at the point of wear, serving as an advanced warning that catastrophic failure will occur if the wear is not addressed. Health monitoring systems, such as oil debris monitoring, are used to find these small particles so that the wear can be resolved before it's too late. Indigenous powertrain development Customer needs and expectations on drivability, fuel economy, and safety has pushed Indian and multinational OEMs to think about the development of powertrains and gearboxes for local needs with global standards. The next wave of crash simulation As computing speed has improved and software itself has made significant speed and performance gains with each release, modeling tools are now quick enough to build high-quality, large, high-detail vehicle models in a very efficient manner.
2014-11-17
Article
Among the many premium interior features in the 2015 Hyundai Genesis is a “world-first” safety technology—an in-cabin CO2 sensor control system, located under the glove box, that combats occupant drowsiness.
2014-11-17
Article
The Association of Global Automakers and its 12 member companies have unveiled auto industry consumer privacy protection principles (http://www.globalautomakers.org/topic/privacy) for vehicle technologies and services.
2014-11-14
WIP Standard
J1113/13
This SAE Standard specifies the test methods and procedures necessary to evaluate electrical components intended for automotive use to the threat of Electrostatic Discharges (ESDs). It describes test procedures for evaluating electrical components on the bench in the powered mode and for the packaging and handling non-powered mode. A procedure for calibrating the simulator that is used for electrostatic discharges is given in Appendix A. An example of how to calculate the RC Time Constant is given in Appendix B Functional Performance Status Classifications for immunity to ESD and Sensitivity classificatins for ESD sensitive devices are given in Appendix C.

Sensitivity classifications for ESD sensitive devices are given in Appendix B.

2014-11-13
Article
Having two gear ratios rather than the single ratio that is typical of EVs enables the eAxle to boost the i8's all-wheel-drive performance across its entire speed range.
2014-11-13
WIP Standard
AIR5358A
This SAE Aerospace Information Report (AIR) was prepared by a panel of the SAE A-5 Committee. This document establishes the specifications for fluids used in landing gear shock struts with extreme pressure and antiwear additives that have been added for improved lubrication.
2014-11-12
Article
The AD2410 transceiver from Analog Devices, Inc.(ADI) is the first in a family of devices that enables ADI’s new automotive audio bus, which significantly reduces the weight of existing cable harnesses, resulting in improved vehicle fuel efficiency while delivering high fidelity audio.
2014-11-12
Article
A Level 2 electric vehicle charger that can dispense power based on the available grid supply is undergoing its first field test in Detroit.
2014-11-12
Article
When a pedestrian appears on the road ahead of your car, it's a potentially dangerous situation. In this episode of SAE Eye on Engineering, Senior Editor Lindsay Brooke looks at Honda's new driver-assist feature called "Honda Sensing."
Viewing 31 to 60 of 21089

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