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Viewing 91 to 120 of 21013
2014-10-13
Technical Paper
2014-01-2860
Ramdas Ugale
Abstract Emerging markets like India is very cost sensitive for small engines like motorcycle. Capacitive discharge Ignition (CDI) with carburetor is popular low cost solution with good engine performance. CDI system accumulates charge inside the ignition capacitor, until a point at which a signal allows to release discharge of the stored charge to the spark plug through high tension coil. This paper will focus on single spark digital two teeth DC CDI solution and below design challenges with two sparks. 1 Higher power dissipation in step up fly back converter2 Need higher CPU speed, flash size and restrictions on engine map profile for advance angles This paper will elaborate above problems and their solutions with test results for optimizing solution cost and achieve performance. Solutions include, exploring 8 bit microcontroller peripherals usage and smart software to boost MCU performance for engine dynamic conditions and to achieve lower losses in flyback converter.
2014-10-13
Technical Paper
2014-01-2899
Lukasz Grabowski, Konrad Pietrykowski, Michal Geca, Grzegorz Baranski
Abstract City buses are equipped with an increasing number of electrical devices that are designed to improve the driver work and increase passengers' comfort. The alternator must therefore meet the requirements of increased levels of electric energy demand. In this paper, the focus is set on the amount of chemical energy in the fuel transformed into electric energy by the alternator, especially in the case of urban transport. The article presents the results of operating states of the alternator in the city bus while driving. During the study waveforms of rotational speed and load current of power generation system were recorded. The results of measurements made it possible to draw histograms showing the share of working time in different points of the alternator work. Only about 43% of the total working time corresponds to the bus stop and the operation of the idle speed of the alternator 2250 rpm. The remaining time corresponds to the average speed about 4200 rpm and does not exceed 6600 rpm.
2014-10-13
Technical Paper
2014-01-2896
Krzysztof Jan Siczek
Abstract Conditions of the bacterial battery have been presented in the article. The models of different design configurations of bacterial battery and its assembly with electric circuit has been elaborated. The obtained values of voltage and currents obtained in such models has been compared with the case of similar circuit using lithium-ion battery and presented in the paper.
2014-10-13
Technical Paper
2014-01-2894
Boru Jia, Zhengxing Zuo, Huihua Feng, Guohong Tian, A. P. Roskilly
Abstract The free-piston engine generator (FPEG) is a novel type of energy conversion device; it integrates a two stroke combustion engine and a linear electric machine into a single unit. As an alternative to conventional engines, the FPEG is a promising power generation system due to its simplicity and high thermal efficiency and has attracted considerable research interests recently. This paper presents the development for a spark-ignited free-piston engine generator prototype, and the design of major sub-systems is introduced. The electrical linear machine is operated as a motor to start the engine and switched to a generator after successful ignition. Ignition is one of the most crucial problems for the generating process, thus a unique control sub-system to generate ignition signals at the correct ignition timing based on the piston position was completed. Then experiments of the starting process were carried out with the prototype. The results indicate that with a fixed motor force of 110N, the maximum in-cylinder gas pressure can reach 12 bar and the compression ratio can reach 8:1.
2014-10-13
Technical Paper
2014-01-2901
Albert Albers, Kevin Matros, Matthias Behrendt, Johannes Henschel, Heidelinde Holzer, Wolfram Bohne
The requirement of the start of the internal combustion engine (ICE) not only at vehicle standstill is new for full hybrid electric vehicles in comparison to conventional vehicles. However, the customer will not accept any deterioration with respect to dynamics and comfort. ICE-starting-systems and -strategies have to be designed to meet those demands. Within this research, a method was developed which allows a reproducible maneuver-based analysis of ICE-starts. In the first step, a maneuver catalogue including a customer-oriented maneuver program with appropriate analysis criteria was defined. Afterwards, the maneuvers were implemented and verified in a special test bench environment. Based on the method, two sample hybrid vehicles were benchmarked according to the maneuver catalogue. The benchmarking results demonstrate important dependencies between the criteria-based assessment of ICE-starts and the embedded ICE-starting-system and -strategy. Those findings led to recommendations regarding the selection of suitable starting-systems and the design of the starting-strategy.
2014-10-13
Technical Paper
2014-01-2748
Dehao Ju, Tingting Zhang, Jin Xiao, Zhen Huang
Abstract In order to quantitatively investigate the macroscopic characteristics of flash-boiling atomization, the spray injected through a plain-orifice nozzle under atmospheric conditions was directly imaged and analyzed by the multi-threshold algorithm. The spray images were acquired at various times after the start of actuation using a high-speed visualization system. The light intensity level of images implies the local relative mass concentration of droplets in the spray. Transient contour plots of spray images at various thresholds were analyzed and compared with turbulent round jets of diesel. A new term, transient continuous cone angle, was defined to characterize the flash-boiling spray. The relative mass concentration distributions and continuous cone angles of the sprays during the start, development and end periods of the atomization were discussed for two different sprays. The grayscale levels of sprays in the outer and end regions of the sprays were lower compared to those in the center regions, because the droplets at the outer and end regions were well-atomized by the volatile nature of the material and the friction between the injected droplets and the surrounding gas.
2014-10-13
Standard
AMSQQA200/11A
This specification covers the specific requirements for aluminum alloy 7075 bar, rod, shapes, tube, and wire produced by extrusion. AMS-QQ-A-200/11A has been declared "STABILIZED" by AMS Committee D. This document will no longer be updated and may no longer represent standard industry practice. This document was stabilized because it contains requirements that are no longer state of the art and are also contained in alternate documents that contain equivalent requirements. Previously this document was reaffirmed. AMS Committee D has never performed a technical update of this document. Users of this document should refer to the cognizant engineering organization for disposition of any issues with reports/certifications to this specification; including exceptions listed on the certification. NOTE: In many cases, the purchaser may represent a sub tier supplier and not the cognizant engineering organization.
2014-10-13
Technical Paper
2014-01-2711
Nicolas Arnault, Guy Monsallier
Abstract Cold weather is a challenge for compression ignition engines. As Diesel fuel creates wax crystals when temperature goes down enough, it comes to plug the fuel filter and the fuel injection system, leading to undesirable effects like loss of power, engine stall after start or even the engine not starting at all. Moreover, it has been shown that FAME Biodiesel has additional negative impacts on vehicle cold flow operability. Despite fuel additives which can support cold conditions, the whole fuel injection system has to be designed to support engine operability in variable environments, meaning also in very cold conditions, with variable fuel qualities. The Diesel Fuel Filter is a key element of the fuel injection system, as it could become to get plugged by wax and deposit formed at cold temperatures. This can generate fuel shortage on the common rail and high pressure fuel injectors. Addressing this filter plugging effect, can be crucial for vehicle operability. In order to understand and quantify the cold fuel flow impact on the Diesel fuel filter, a design of experiment has been set-up and achieved.
2014-10-10
WIP Standard
J1939DA
The J1939 Digital Annex The J1939 Digital Annex, introduced in August 2013, offers key J1939 technical data in an Electronic Spreadsheet that can be easily searched, sorted, and adapted to other formats. J1939DA contains all of the SPNs (parameters), PGNs (messages), and other J1939 data previously published in the SAE J1939 top level document. J1939DA also contains all of the SLOTs, Manufacturer ID Codes, NAME Functions, and Preferred Addresses previously published in the SAE J1939 top level and the J1939-71 document. J1939DA contains the complete technical details for all of the SPNs and PGNs previously published in the SAE J1939-71 document. For all other SPNs and PGNs which are published in a document other than SAE J1939-71, J1939DA lists only basic details along with a reference to the document that contains the complete technical details. J1939DA replaces, and expands upon, the 1939 Companion Spreadsheet (CS1939), which was last published through November 2012. The data fields included in J1939DA for PGNs are: PGN Parameter Group Label Acronyn EDP DP PF PGN Length PS PGN Description Multipacket Transmission Rate PGN Data Length Default Priority PGN Reference PGN Document The data fields included in J1939DA for SPNs are: SPN SPN Name SPN Description SPN Length Resolution Offset Data Range Operational Range Units SLOT Identifier SPN Type SPN Reference SPN Document The J1939 Digital Annex is current through Second Quarter 2014 and can be purchased separately or as part of the SAE J1939 Standards Collection on the Web.
2014-10-09
Article
Not all hands-free technologies are alike, and poorly designed ones can increase driver distraction. That was one of the findings of an AAA Foundation for Traffic Safety study, the results of which it released Oct. 7.
2014-10-09
Standard
ARP4103A
This document recommends design and performance criteria for aircraft lighting systems used to illuminate flight deck controls, luminous visual displays used for transfer of information, and flight deck background and instrument surfaces that form the flight deck visual environment. This document is for commercial transport aircraft except for applications requiring night vision compatibility.
2014-10-08
Article
As populations in sprawling urban areas rise, commuting will become a bigger challenge. Connected cars are likely to leverage connectivity to help commuters reach destinations using different modes of transportation, further driving development teams to collaborate more extensively within their companies and with outsiders from many fields.
2014-10-08
WIP Standard
ARP6336
This SAE Aerospace Recommended Practice (ARP) provides technical recommendations for the application, design and development of lighting for Unmanned Aircraft (UA). The recommendations set forth in this document are to aid in the design of UA lighting for the type or size of aircraft and the operation in the National Aerospace System for which the aircraft is intended.
2014-10-08
Standard
AIR6226
Most of the Trimmable Horizontal Stabilizer Actuators (THSA) feature a dual structural load path, the primary load path being loaded, the secondary load path being normally unloaded, or both load paths sharing in parallel the Horizontal Stabilizer load. This document describes existing methods for detecting rupture or disconnection of loaded load paths as an overview for those specifying or designing Horizontal Stabilizer Trim Actuators in order to compare existing solutions as reference for implementation in new aircraft programs.
2014-10-07
Magazine
Outlook for autonomous driving includes cloud Connectivity with off-board data and services and among vehicles will be crucial in maintaining safety and security in future autonomous vehicles. 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. SAE 2014 Convergence preview Interest in advanced driver-assistance technologies is surging, with automotive engineers and decision makers at OEMs and suppliers working feverishly on the convenience vs. safety trade-off and other electronics-related challenges. Cooled EGR shows benefits for gasoline engines Exhaust gas recirculation systems now in use on diesel engines are used mainly to meet emissions regulations. In gasoline engines, they are an appealing way to meet ever more stringent fuel-economy standards
2014-10-06
Article
Under a long-term partnership announced Oct. 3, AKKA Technologies Group engineers will work with the company's 3DEXPERIENCE platform to develop the next generation of its autonomously driving Link&Go concept car using Dassault Systèmes applications to ideate, design, simulate, and validate on a single collaborative platform hosted on the Cloud.
2014-10-06
Standard
AS24001A
No scope available.
2014-10-03
WIP Standard
AS8472
This document defines methods to exchange data about the health of a fiber optic network.
2014-10-02
Article
Earlier this year, SAE International published an Information Report categorizing and defining various levels of automated driving. Now it is offering a handy and free two-page document at http://www.sae.org/misc/pdfs/automated_driving.pdf to illustrate and summarize the categories.
2014-10-02
WIP Standard
AS23053/1
This detail specification establishes the requirements for a range of similar electrical insulating sleevings that will shrink to a predetermined size upon the application of heat.
2014-10-02
WIP Standard
AS23053/11
This detail specification establishes the requirements for a range of similar electrical insulating sleevings that will shrink to a predetermined size upon the application of heat.
2014-10-02
WIP Standard
AS23053/10
This detail specification establishes the requirements for a type of electrical insulating sleeving that will shrink to a predetermined size upon the application of heat.
2014-10-02
WIP Standard
AS23053/12
This detail specification establishes the requirements for a range of similar electrical insulating sleevings that will shrink to a predetermined size upon the application of heat.
2014-10-02
WIP Standard
AS23053/13
This detail specification establishes the requirements for a type of electrical insulating sleeving that will shrink to a predetermined size upon the application of heat.
2014-10-02
WIP Standard
AS23053/15
This detail specification establishes the requirements for a range of similar electrical insulating sleevings that will shrink to a predetermined size upon the application of heat.
2014-10-02
WIP Standard
AS23053/18
This detail specification establishes the requirements for a range of similar electrical insulating sleevings that will shrink to a predetermined size upon the application of heat.
2014-10-02
WIP Standard
AS23053/14
This detail specification establishes the requirements for a type of electrical insulating sleeving that will shrink to a predetermined size upon the application of heat.
2014-10-02
WIP Standard
AS23053/16
This detail specification establishes the requirements for a type of electrical insulating sleeving that will shrink to a predetermined size upon the application of heat.
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