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Viewing 1 to 30 of 410
2017-10-08
Technical Paper
2017-01-2241
Xin Yu, Vincent Costanzo, Elana Chapman, Richard Davis
In this work, an experimental method was developed to induce and rate preignition tendency in a single cylinder research SI engine. By observing and quantifying the statistical behavior of some key combustion parameter, a single valued ranking was defined. The sensitivity of this induced preignition ranking method was then explored by varying different engine operating conditions. Finally, different hydrocarbon fuels were found to have relatively large variations on the ranking.
2017-09-04
Journal Article
2017-24-0072
Gabriele Di Blasio, Carlo Beatrice, Giacomo Belgiorno, Francesco Concetto Pesce, Alberto Vassallo
Abstract The paper describes the challenges and results achieved in developing a new high-speed Diesel combustion system capable of exceeding the imaginative threshold of 100 kW/l. High-performance, state-of-art prototype components from automotive diesel technology were provided in order to set-up a single-cylinder research engine demonstrator. Key design parameters were identified in terms boost, engine speed, fuel injection pressure and injector nozzle flow rates. In this regard, an advanced piezo injection system capable of 3000 bar of maximum injection pressure was selected, coupled to a robust base engine featuring ω-shaped combustion bowl and low swirl intake ports. The matching among the above-described elements has been thoroughly examined and experimentally parameterized.
2017-08-08
Article
IBM created the AutoLAB to integrate Watson, IoT and Blockchain technologies into the automotive experience.
2017-07-17
Article
Virtual-reality innovations are emerging as crucial new weapons to enhance - and abbreviate - the automotive product-development process.
2017-07-10
Article
Reconfigurable aerodynamic aids are stretching performance-car envelopes in every direction.
2017-06-16
Article
Soon, new vehicles will be able to communicate back and forth with each other and with traffic signals.
2017-06-07
Article
Without a properly educated engineering workforce, the road to automated vehicles could be a rocky one. Helping take the bumps out is SAE International and General Motors with AutoDrive ChallengeTM, SAE's newest Collegiate Design Series competition now being rolled out.
2017-06-05
Technical Paper
2017-01-1893
Douglas Moore
Abstract This paper will examine the regulatory development process, discuss the technical principles of the Economic Commission for Europe (ECE), R51.03 test, and discuss the overall objectives of the ECE R51.03 noise emission regulation. The development of this global noise emission regulation was a multi-stakeholder process which has resulted in new test procedures and new noise emission regulation principles. New test procedures based on ISO 362-1:2015 move the test basis to representative in-use noise emission, independent of vehicle propulsion technology. As part of the regulatory development, a monitoring program was conducted by the European Union to assess the applicability of the proposed test to provide representative vehicle noise emission results. The monitoring results also provided the basis to determine equivalent stringency between the test procedures of ECE R51.02 and R51.03.
2017-06-05
Technical Paper
2017-01-1823
Dennis J. Kinchen
Abstract Powertrain mounting systems design and development involves creating and optimizing a solution using specific mount rates and evaluation over multiple operating conditions. These mount rates become the recommended “nominal” rates in the specifications. The powertrain mounts typically contain natural materials. These properties have variation, resulting in a tolerance around the nominal specification and lead to differences in noise and vibration performance. A powertrain mounting system that is robust to this variation is desired. The design and development process requires evaluation of these mounts, within tolerance, to ensure that the noise and vibration performance is consistently met. During the hardware development of the powertrain mounting system, a library of mounts that include the range of production variation is studied. However, this is time consuming.
2017-06-05
Journal Article
2017-01-1770
Wallace Hill, Dennis Kinchen, Mark A. Gehringer
Abstract This paper describes the development of an analytical method to assess and optimize halfshaft joint angles to avoid excessive 3rd halfshaft order vibrations during wide-open-throttle (WOT) and light drive-away events. The objective was to develop a test-correlated analytical model to assess and optimize driveline working angles during the virtual design phase of a vehicle program when packaging tradeoffs are decided. A twelve degree-of-freedom (12DOF) system model was constructed that comprehends halfshaft dynamic angle change, axle torque, powertrain (P/T) mount rate progression and axial forces generated by tripot type constant velocity (CV) joints. Note: “tripot” and “tripod” are alternate nomenclatures for the same type of joint. Simple lumped parameter models have historically been used for P/T mount optimization; however, this paper describes a method for using a lumped parameter model to also optimize driveline working angles.
2017-06-05
Technical Paper
2017-01-1775
Mark A. Gehringer, Robert Considine, David Schankin
Abstract This paper describes recently developed test methods and instrumentation to address the specific noise and vibration measurement challenges posed by large-diameter single-piece tubular aluminum propeller (prop) shafts with high modal density. The prop shaft application described in this paper is a light duty truck, although the methods described are applicable to any rotating shaft with similar dynamic properties. To provide a practical example of the newly developed methods and instrumentation, impact FRF data were acquired in-situ for two typical prop shafts of significantly different diameter, in both rotating and stationary conditions. The example data exhibit features that are uniquely characteristic of large diameter single-piece tubular shafts with high modal density, including the particular effect of shaft rotation on the measurements.
2017-03-28
Technical Paper
2017-01-1112
Jian yao, Li Chen, Ding Zhao Jr, Chunhao Lee, Ying Huang, Yin Chengliang
Abstract The wedge clutch takes advantages of small actuation force/torque, space-saving and energy-saving. However, big challenge arises from the varying self-reinforced ratio due to the varying friction coefficient inevitably affected by temperature and wear. In order to improve the smoothness and synchronization time of the slipping process of the wedge clutch, this paper proposes a self-tuning PID controller based on Lyapunov principle. A new Lyapunov function is developed for the wedge clutch system. Simulation results show that the self-tuning PID obtains much less error than the conventional PID with fixed gains. Moreover, the self-tuning PID is more adaptable to the variation of the friction coefficient for the error is about 1/5 of the conventional PID.
2017-03-28
Journal Article
2017-01-1623
Tim Felke, Steven Holland, Sachin Raviram
Abstract Suppliers and integrators are working with SAE’s HM-1 standards team to develop a mechanism to allow “Health Ready Components” to be integrated into larger systems to enable broader IVHM functionality (reference SAE JA6268). This paper will discuss how the design data provided by the supplier of a component/subsystem can be integrated into a vehicle reference model with emphasis on how each aspect of the model is transmitted to minimize ambiguity. The intent is to enhance support for the analytics, diagnostics and prognostics for the embedded component. In addition, we describe functionality being delegated to other system components and that provided by the supplier via syndicated web services. As a specific example, the paper will describe the JA6268 data submittal for a typical automotive turbocharger and other engine air system components to clarify the data modeling and integration processes.
2017-03-28
Journal Article
2017-01-0801
Keith Vertin, Brent Schuchmann, William Studzinski, Richard S. Davis, Thomas G. Leone, James E. Anderson, Asim Iqbal
Abstract Automakers are designing smaller displacement engines with higher power densities to improve vehicle fuel economy, while continuing to meet customer expectations for power and drivability. The specific power produced by the spark-ignited engine is constrained by knock and fuel octane. Whereas the lowest octane rating is 87 AKI (antiknock index) for regular gasoline at most service stations throughout the U.S., 85 AKI fuel is widely available at higher altitudes especially in the mountain west states. The objective of this study was to explore the effect of gasoline octane rating on the net power produced by modern light duty vehicles at high altitude (1660 m elevation). A chassis dynamometer test procedure was developed to measure absorbed wheel power at transient and stabilized full power operation. Five vehicles were tested using 85 and 87 AKI fuels.
2017-03-21
Article
Steady technology development and committed infrastructure investment combine to bring fuel-cell vehicles (FCVs) to the brink of mainstream applicability.
2017-02-14
Article
The high cost of developing new technologies such as fuel cells is making partners out of competitors.
2017-01-30
Article
After three years of co-developing a new-generation fuel cell stack aimed at light vehicles, military, aerospace and other applications, Honda and GM have announced the establishment of Fuel Cell System Manufacturing LLC—the industry’s first joint venture for fuel-cell production.
2017-01-10
Technical Paper
2017-26-0108
MM Hashim
Abstract Interior permanent magnet machines are being widely used in hybrid vehicles owing to their compact size and high power density. Vehicle level application requires the motor to operate at high speed beyond the base speed of the motor. This is accomplished through flux weakening control. Nonfunctioning of inverter switches and/or gate driver circuit during flux weakening could give rise to a potential fault scenario called Un-Controlled Generation (UCG). This paper gives a detailed background of UCG and its impact on the high voltage and propulsion systems. In further sections the details related to modelling and analysis of UCG will be discussed. Finally, the paper will conclude with simulation results and comparison of the results with motor dynamometer test data.
2016-12-01
Article
Delphi rolls out its next-gen automated-driving technology platform, called CSLP, due for production by 2019.
2016-11-29
Article
While Donald Trump was blasting China for allegedly taking U.S. jobs, GM was quietly importing new China-made vehicles into the U.S.
2016-11-15
Article
At least for this moment, all is right with the world as Mercedes-Benz reinstates a new-age version of its iconic inline six-cylinder engine.
2016-11-07
Article
The Administration recently announced details of the expanded network of EV charging stations across nearly 25,000 mi (40,233 km) of highways in 35 U.S. states and the District of Columbia.
2016-10-25
Technical Paper
2016-36-0360
Lucas Pintol Nishikawa, André Caetano Melado, Hélio Goldenstein, Luiz Felipe Bauri, Dinecio dos Santos Filho, Eduardo Nunes
Abstract The Austempering heat treatment is a well-known solution to improve the mechanical properties of ductile cast irons, therefore being referred as 'ADI' (Austempered Ductile Iron). The improved mechanical properties of ADI's with respect to conventional ductile iron is attributed to its resulting microstructure, which contains mainly carbide-free bainite with stabilized retained austenite. More recently, ductile cast irons were submitted to another heat treatment, known as 'Quenching and Partitioning' (Q&P). In this case, the ductile cast iron is austenitized, quenched to a temperature between Mf and Ms temperatures and subsequently heated to a temperature above Ms in order to partition the carbon from the martensite to the remaining austenite. The resulting microstructure comprises mainly low carbon martensite, austenite (stabilized by the carbon partition) and carbide-free bainite. Such microstructure resulted in equal or better properties than ADI.
2016-10-24
Article
The key to engineering greatness is the willingness to take intelligent risks—both reputational and risks with the product, says one of the industry's greatest "product guys."
2016-09-22
Article
GM has taken a lesson from Tesla's Autopilot driver engagement problems and its new Super Cruise driving system will be different.
2016-09-16
Article
Advanced tire-simulation modeling allows tire development to keep pace with accelerated vehicle development cycles.
2016-08-01
Article
For 2016, the fourth year of its annual Enlighten Awards that acknowledge the best innovations in vehicle weight reduction, Altair named GM’s 2016 Cadillac CT6 as the winner in the Full-Vehicle category and ContiTech’s polyamide rear-axle transmission crossbeam is the winner in the Enlighten Awards’ Module category.
2016-07-17
Article
In concert with partner AK Steel, NanoSteel has finally brought its new sheet steel to the production threshold as the industry gobbles high-strength, lighter weight alloys at an increasing rate.
2016-06-30
Article
Vehicle-to-vehicle, or V2V communication could be the biggest safety boon since seatbelts.
2016-06-21
Article
Disruption is one thing, but another Tesla controversy helps explain why many tech companies know better than to try to take over the auto business.
Viewing 1 to 30 of 410

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