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Viewing 1 to 30 of 4547
2017-01-10
Technical Paper
2017-26-0349
Rushil Batra, Sahil Nanda, Shubham Singhal, Ranganath Singari
This study is an attempt to develop a decision support and control structure based on fuzzy logic for deployment of automotive airbags. Airbags, though an additional safety feature in vehicles, have proven to be fatal in various instances. Most of these casualties could have been avoided by using seat belts in the intended manner that is, as a primary restraint system. Fatalities can be prevented by induction of smart systems which can sense the presence and differentiate between passengers and conditions prevailing at a particular instant. Fuzzy based decision making has found widespread use due to its ability to accept non-binary or grey data and compute a reliable output. Smart airbags also allow the Airbag Control Unit to control inflation speed depending on instantaneous conditions.
2017-01-10
Technical Paper
2017-26-0051
Praveen Babu Kandavalli, Ramanathan Karthi, Suresh Suresh Kumar, M Anand
Lubrication system is a critical factor for engine health. But it creates parasitic load and increased fuel consumption of the engine. The oil demand of an engine depends on engine speed, load, bearing clearances, operating temperature and engine's state of wear. Ideally, the oil pump should adapt the delivery volume flow to actual engine oil demand and should avoid unnecessary pumping of oil which causes increased power and fuel consumption. However in a conventional mechanical oil pump, there is no control on the oil flow and it is purely a function of operating speed. A variable discharge oil pump (VDOP) is an approach to reduce the parasitic losses wherein the oil flow is regulated based on the mechanical needs of the engine. This study is based on the results of a two stage VDOP installed on a 1.2L 3 cylinder MPFI engine. The oil supply is regulated by a solenoid control which receives command from Engine control Unit (ECU). The study was done in two stages.
2017-01-10
Technical Paper
2017-26-0101
Jakob Howard, Mike Savage
Mild-hybridisation of conventional powertrains is set to become commonplace over the next 5 years, providing a proportion of the on-cycle and real-world CO2 benefits of a high-voltage hybrid at a far lower cost. However, the majority of this focus is around engine-related systems such as belt starter-generators and electric-superchargers. Design studies and simulations have shown that hybridising elements of the transmission system can extend the efficiency gains of engine based mild-hybrid and stop-start systems. Equally important, is the potential for a transmission integrated electrical system to support value-adding features such as electric creep, engine-off coasting or electric torque support for manual or automated manual transmissions, which can either further justify or partially offset the additional cost of the hybrid system.
CURRENT
2016-12-01
Standard
J1939/14_201612
CAN controllers are now available which support the Flexible Data Rate Frame Format. These controllers, when used on SAE J1939-14 networks, must be restricted to use only the Classical Frame Format compliant to ISO 11898-1:2015. This SAE Recommended Practice is intended for light- and heavy-duty vehicles on- or off-road as well as appropriate stationary applications which use vehicle derived components (e.g., generator sets). Vehicles of interest include but are not limited to: on- and off-highway trucks and their trailers; construction equipment; and agricultural equipment and implements.
CURRENT
2016-11-29
Standard
J2284/3_201611
This SAE Recommended Practice will define the Physical Layer and portions of the Data Link Layer of the Open Systems Interconnection model (ISO 7498) for a 500 kbps High-Speed CAN (HSC) protocol implementation. Both ECU and media design requirements for networks will be specified. Requirements will primarily address the CAN physical layer implementation. Requirements will focus on a minimum standard level of performance from the HSC implementation. All ECUs and media shall be designed to meet certain component level requirements in order to ensure the HSC implementation system level performance at 500 kbps. The minimum performance level shall be specified by system level performance requirements or characteristics described in detail in Section 5 of this document. This document is designed such that if the Electronic Control Unit (ECU) requirements defined in Section 6 are met, then the system level attributes should be obtainable.
2016-11-08
Technical Paper
2016-32-0084
Shinichi Okunishi, Ken Ogawa
Abstract The accurate measurement of air volume is one of the critical issues in an LPL-EGR system, which has a large intake volume from the EGR valve to the combustion chamber compared to an HPL-EGR system. This includes the difficulty of measuring the flow rate of the LPL-EGR accurately. In this study, we investigated the EGR rate estimation logic with the cylinder pressure for an LPL-EGR system. This methodology is characterized by an EGR rate estimation, which uses the polytrophic change during the compression stroke, depending on the mixture and EGR rate. The polytrophic index is mainly changed by the EGR rate and the airflow rate. The EGR rate is estimated by the difference between measured pressure with sensors, and referenced pressure, which is calculated by measured parameters before compression with the assumption that the EGR rate is zero. To calculate the exact EGR rate, the influence of the air fuel ratio on the cylinder pressure was also taken into account.
2016-11-08
Technical Paper
2016-32-0083
Michael Zisser, Hans-Juergen Schacht, Reinhard Stelzl, Bernhard Schweighofer, Hannes Wegleiter, Stephan Schmidt, Jakob Trentini, Jan-Philipp Banzhaf, Tim Gegg
Abstract In order to fulfill future regulations regarding emissions and CO2 reduction, the small engine market inclines to migrate from carburetor systems to cleaner, more efficient electronic ignition controls and electronic fuel injection systems. When implementing such mechatronic systems in small engine applications, one has to consider specific boundary conditions like the lack of relevant sensors, limited possibilities in terms of space and of course the necessity to keep the costs as low as possible. Especially in the non-road mobile machinery (NRMM) segment, the absence of sensors makes it difficult to apply standard electronic control systems, which are based on engine related input signals provided by sensors. One engine related signal, which is even provided by the simplest engine setup, is some form of the crankshaft speed since it is essential for the functionality of the engine.
2016-11-08
Technical Paper
2016-32-0086
Tobias Gutjahr
Abstract Data-driven plant models are well established in engine base calibration to cope with the ever increasing complexity of today’s electronic control units (ECUs). The engine, drive train, or entire vehicle is replaced with a behavioral model learned from a provided training data set. The model is used for offline simulations and virtual calibration of ECU control parameters, but its application is often limited beyond these use cases. Depending on the underlying regression algorithm, limiting factors include computationally expensive calculations and a high memory demand. However, development and testing of new control strategies would benefit from the ability to execute such high fidelity plant models directly in real-time environments. For instance, map-based ECU functions could be replaced or enhanced by more accurate behavioral models, with the implementation of virtual sensors or online monitoring functions.
CURRENT
2016-10-16
Standard
AS20708/36B
Scope is unavailable.
CURRENT
2016-10-16
Standard
AS20708/35B
Scope is unavailable.
CURRENT
2016-10-16
Standard
AS20708/33B
Scope is unavailable.
CURRENT
2016-10-16
Standard
AS20708/30B
Scope is unavailable.
CURRENT
2016-10-13
Standard
AS20708/34B
Scope is unavailable.
CURRENT
2016-10-13
Standard
AS20708/45B
Scope is unavailable.
CURRENT
2016-10-13
Standard
AS20708/32B
Scope is unavailable.
CURRENT
2016-10-13
Standard
AS20708/29B
Scope is unavailable.
2016-10-06
WIP Standard
ARP4005C
This SAE Aerospace Recommended Practice (ARP) provides information to guide in the selection of electromechanical relays to be used in electrical/electronic circuits for application in aerospace, ground, and shipboard systems to achieve proper performance.
CURRENT
2016-09-29
Standard
J1171_201609
This SAE Recommended Practice covers all electrical devices suitable for use in marine engine compartments and fuel tank spaces.
2016-09-28
WIP Standard
ARP4102/13B
This document recommends criteria for a system designed to manage and communicate information via data link to support flight operations.
2016-09-27
Technical Paper
2016-01-8080
Yanwu Ge, Ying Huang
Abstract The ever-growing number of interacting electronic vehicle control systems requires new control algorithms to manage the increasing system complexity. As a result, torque-based control architecture has been popular for its easy extension as the torque demand variable is the only interface between the engine control algorithms and other vehicle control systems. Under the torque-based control architecture, the engine and AT coordinated control for upshift process is investigated. Based on the dynamics analysis, quantitative relationship between the turbine torque of HTC and output shaft torque of AT has been obtained. Then the coordinated control strategy has been developed to smooth the torque trajectory of AT output shaft. The designed control strategy is tested on a powertrain simulation model in MATLAB/Simulink and a test bench. Through simulation, the shift time range in which the engine coordinated control strategy is effective is acquired.
2016-09-27
Technical Paper
2016-01-8033
Guoying Chen
Abstract According to the vehicle’s driving conditions, electronically controlled air suspension (ECAS) systems can actively adjust the height of vehicle body, so that better ride comfort and handling stability will be achieved, which can’t be realized by traditional passive suspension. This paper presents a design and implementation of ECAS controller for vehicle. The controller is aimed at adjusting the static and dynamic height of the vehicle. To exactly track the height of the vehicle and satisfy the control demand of air suspension, a height sensor decoding circuit based on the inductance sensor is designed. Based on it, a new height control algorithm is adopted to achieve rapid and precise control of vehicle height. To verify the function of the designed controller and the proposed height control algorithm, an air spring loading test bench and an ECU-in-loop simulation test bench are respectively established.
2016-09-27
Journal Article
2016-01-8142
Jeremy Daily, Rose Gamble, Stephen Moffitt, Connor Raines, Paul Harris, Jannah Miran, Indrakshi Ray, Subhojeet Mukherjee, Hossein Shirazi, James Johnson
Abstract Cyber assurance of heavy trucks is a major concern with new designs as well as with supporting legacy systems. Many cyber security experts and analysts are used to working with traditional information technology (IT) networks and are familiar with a set of technologies that may not be directly useful in the commercial vehicle sector. To help connect security researchers to heavy trucks, a remotely accessible testbed has been prototyped for experimentation with security methodologies and techniques to evaluate and improve on existing technologies, as well as developing domain-specific technologies. The testbed relies on embedded Linux-based node controllers that can simulate the sensor inputs to various heavy vehicle electronic control units (ECUs). The node controller also monitors and affects the flow of network information between the ECUs and the vehicle communications backbone.
2016-09-20
Journal Article
2016-01-1982
Michelle Bash, Steven Pekarek, Jon Zumberge
Abstract The cost and complexity of aircraft power systems limit the number of integrated system evaluations that can be performed in hardware. As a result, evaluations are often performed using emulators to mimic components or subsystems. As an example, aircraft generation systems are often tested using an emulator that consists of a bank of resistors that are switched to represent the power draw of one or more actuators. In this research, consideration is given to modern wide bandwidth emulators (WBEs) that use power electronics and digital controls to obtain wide bandwidth control of power, current, or voltage. Specifically, this paper first looks at how well a WBE can emulate the impedance of a load when coupled to a real-time model. Capturing the impedance of loads and sources is important for accurately assessing the small-signal stability of a system.
2016-09-20
Technical Paper
2016-01-1985
Fei Gao, Serhiy Bozhko, Patrick Wheeler
Abstract The paper will deal with the problem of establishing a desirable power sharing in multi-feed electric power system for future more-electric aircraft (MEA) platforms. The MEA is one of the major trends in modern aerospace engineering aiming for reduction of the overall aircraft weight, operation cost and environmental impact. Electrical systems are employed to replace existing hydraulic, pneumatic and mechanical loads. Hence the onboard installed electrical power increases significantly and this results in challenges in the design of electrical power systems (EPS). One of the key paradigms for future MEA EPS architectures assumes high-voltage dc distribution with multiple sources, possibly of different physical nature, feeding the same bus(es). In our study we investigate control approaches to guarantee that the total electric load is shared between the sources in a desirable manner. A novel communication channel based secondary control method is proposed in this paper.
2016-09-20
Technical Paper
2016-01-1986
Qian Li, Balakrishnan Devarajan, Xuning Zhang, Rolando Burgos, Dushan Boroyevich, Pradeep Raj
Abstract The more electric aircraft (MEA) concept has gained popularity in recent years. As the main building blocks of advanced aircraft power systems, multi-converter power electronic systems have advantages in reliability, efficiency and weight reduction. The pulsed power load has been increasingly adopted--especially in military applications--and has demonstrated highly nonlinear characteristics. Consequently, more design effort needs to be placed on power conversion units and energy storage systems dealing with this challenging mission profile: when the load is on, a large amount of power is fed from the power supply system, and this is followed by periods of low power consumption, during which time the energy storage devices get charged.
2016-09-20
Journal Article
2016-01-1987
Mingming Yin, Serhiy Bozhko, Seang Shen Yeoh
Abstract The future aircraft electrical power system is expected to be more efficient, safer, simpler in servicing and easier in maintenance. As a result, many existing hydraulic and pneumatic power driven systems are being replaced by their electrical counterparts. This trend is known as a move towards the More-Electric Aircraft (MEA). As a result, a large number of new electrical loads have been introduced in order to power many primary functions including actuation, de-icing, cabin air-conditioning, and engine start. Therefore electric power generation systems have a key role in supporting this technological trend. Advances in modern power electronics allow the concept of starter/generator (S/G) which enables electrical engine start and power generation using the same electrical machine. This results in substantial improvements in power density and reduced overall weight.
2016-09-20
Journal Article
2016-01-1990
Nisha Kondrath, Nathaniel Smith
Abstract In aerospace applications, it is important to have efficient, small, affordable, and reliable power conversion units with high power density to supply a wide range of loads. Use of wide-band gap devices, such as Silicon Carbide (SiC) and Gallium Nitride (GaN) devices, in power electronic converters is expected to reduce the device losses and need for extensive thermal management systems in power converters, as well as facilitate high-frequency operation, thereby reducing the passive component sizes and increasing the power density. A performance comparison of state-of-the art power devices in a 10 kW full-bridge dc-dc buck converter operating in continuous conduction mode (CCM) and at switching frequencies above 100 kHz will be presented in this manuscript. Power devices under consideration are silicon (Si) IGBT with Si antiparallel diodes, Si IGBT with SiC antiparallel diodes, Si MOSFETs, SiC MOSFETs, and enhancement-mode GaN transistors.
2016-09-20
Technical Paper
2016-01-1991
Syed J. Khalid
Abstract Aircraft subsystems essential for flight safety and airworthiness, including flight controls, environmental control system (ECS), anti-icing, electricity generation, and starting, require engine bleed and power extraction. Predictions of the resulting impacts on maximum altitude net thrust(>8%), range, and fuel burn, and quantification of turbofan performance sensitivities with compressor bleed, and with both high pressure(HP) rotor power extraction and low pressure(LP) rotor power extraction were obtained from simulation. These sensitivities indicated the judicious extraction options which would result in the least impact. The “No Bleed” system in Boeing 787 was a major step forward toward More Electric Aircraft (MEA) and analysis in this paper substantiates the claimed benefits.
2016-09-20
Journal Article
2016-01-2023
Timothy Deppen, Brian Raczkowski, Marco Amrhein, Jason Wells, Eric Walters, Mark Bodie, Soumya Patnaik
Abstract Future aircraft systems are projected to have order of magnitude greater power and thermal demands, along with tighter constraints on the performance of the power and thermal management subsystems. This trend has led to the need for a fully integrated design process where power and thermal systems, and their interactions, are considered simultaneously. To support this new design paradigm, a general framework for codifying and checking specifications and requirements is presented. This framework is domain independent and can be used to translate requirement language into a structured definition that can be quickly queried and applied to simulation and measurement data. It is constructed by generalizing a previously developed power quality analysis framework. The application of this framework is demonstrated through the translation of thermal specifications for airborne electrical equipment, into the SPecification And Requirement Evaluation (SPARE) Tool.
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