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Viewing 1 to 30 of 344
2015-04-14
Technical Paper
2015-01-1152
Brendan M. Conlon, Alan Holmes, Margaret Palardy, Trevor Blohm, Leon Zhou, Steven Tarnowsky, Michael Harpster
The Chevrolet Volt is an electric vehicle with extended-range that is capable of operation on battery power alone, and on engine power after depletion of the battery charge. Since its introduction in 2011, Chevrolet Volts have been driven over half a billion miles: 63% as electric vehicles and 37% in extended range driving. For 2016, GM has developed the next generation of the Volt vehicle and “Voltec” propulsion system. This paper describes the second-generation “Voltec”. The features of the propulsion system components, including energy storage, transaxle, electric motors and power electronics, on-board charging, and engine, are described and compared with the previous generation. Next, the transaxle powerflow is discussed and operation under typical driving conditions is explained. Finally, system efficiency and performance data, based on component tests, is presented and compared with the previous generation.
2015-04-14
Technical Paper
2015-01-0480
Santosh Tiwari, Don Jones, Simon Xu
Response Surface Models are often used as a surrogate for expensive black-box functions during optimization to reduce computational cost. Often, the CAE analysis models (e.g. Crash, NVH, etc.) are highly non-linear and multi-modal. A response surface approximation of such analysis as a result is highly multi-modal; i.e. it contains multiple local optima. A gradient-based optimizer working with such a response surface will often converge to the nearest local optimum. There does not exist any method to find/guarantee a global optima for non-convex multi-modal functions. For such problems, we propose an efficient algorithm to find as many distinct local optima as possible. The proposed method is specifically designed to work in large dimensions (about 100~1000 design variables) and can identify most of the locally optimal solutions in a reasonable amount of time.
2015-04-14
Technical Paper
2015-01-1570
Daniel Vilela, Rubens Pinati, Scott Larsen, Erick Rodrigues, Renato Serrati
This study presents the comparison of vehicle level handling performance results obtained using physical test tire data and a tire developed by means of Finite Element Method. Real tires have been measured in laboratory to obtain the tire force and moment curves in terms of lateral force and align torque as function of tire slip angle and vertical force. The same tire construction has been modeled with Finite Element Method and explicit formulation to generate the force and moment response curves. Pacejka Magic Formula tire response models were then created to represent these curves from both physical and virtual tires. In the sequence, these tire response models were integrated into a virtual multibody vehicle model developed to assess handling maneuvers.
2015-04-14
Technical Paper
2015-01-0194
Hua Zeng, Isao Hoda, William Ivan, Andrew Baker, Syed Kadry, Hiroki Funato, Jia Li, Masayoshi Takahashi, Hideyuki Sakamoto, Ryuichi Saito
Electromagnetic compatibility (EMC) is getting more important in power converters and motor drives as seen in hybrid electric vehicle (HEV) to achieve higher reliability of vehicle and its components. Electromagnetic interference (EMI) of all the electric components for vehicle is evaluated and validated at component-level test bench. However, it is sometimes observed that the EMI level of components is changed due to the difference of configuration (cable routing, connecting location etc.) because the component-level test is not always identical with vehicle-level test. In this presentation, a vehicle-level EMC simulation methodology is introduced to estimate radiated emissions from a vehicle. Also, the comparison between the simulation and measurement results is presented and discussed.
2015-04-14
Technical Paper
2015-01-0944
Maryam Moulai, Ronald Grover, Scott Parrish, David Schmidt
A computational and experimental study was performed to characterize the flow within a gasoline injector and the ensuing sprays. The computations used an in-house code that captures the effects of turbulence, cavitation, flash-boiling, and the presence of non-condensible gases. The flow conditions corresponded to the Spray G target conditions of the Engine Combustion Network. First, the rate of injection was measured using a Bosch-style flow meter. The nozzle was then simulated under submerged conditions for direct comparison of discharge coefficient. Next, the internal flow and external spray into pressurized nitrogen were simulated under the base spray G conditions. Finally, injection under flashing conditions was simulated, where the ambient pressure was below the vapor pressure of the fuel.
2015-04-14
Technical Paper
2015-01-1357
James A. Crowley
In the area of Human Factors and Usability research a desired output of many studies is identification of what value a specific Design Parameter should be set at to minimize customer dissatisfaction. A Customer Loss Function is a simple way to graphically display the probability customers will be dissatisfied at different levels of a given design parameter, due to a given failure mode. Many design parameters however, have two distinct but related Failure Modes (customer disatisfiers), typically representing two ends of the parameter (i.e. too much/too little; too hot/too cold; too fast/too slow). Each of these Failure modes is represented by its own unique Customer Loss Function. This paper will introduce a technique to combine these two One-Sided Loss Functions into a comprehensive Two-Sided Loss Function.
2015-01-15
Article
The GT will be produced as a production street car and will also serve as a new GT-class racecar platform for Ford's 2016 return to the 24 Hours of LeMans. The automaker also debuted new editions of the Raptor high-performance pickup and an R version of the recently introduced Shelby Mustang GT350.
2015-01-05
Article
Current products from 3M can be used to repair aluminum- and carbon fiber-intensive vehicles, but the company is working with OEMs such as General Motors to develop optimized solutions for multi-material structural applications.
2015-01-04
Article
Streaming video in a car? In this episode of SAE Eye on Engineering, Senior Editor Lindsay Brooke examines GM's offering of HD streaming video to the function of a traditional inside rearview mirror. SAE Eye on Engineering can be viewed at http://youtu.be/YF8iURNAPng.
2014-12-29
Article
There's a vehicle revolution going on in North America that's been long overdue. And that's the transformation of the humble light van. In this episode of SAE Eye on Engineering, Senior Editor Lindsay Brooke looks at the new wave of vans that are changing this important vehicle segment. 
2014-12-29
Article
Packing a 640-hp supercharged LT4 V8 under its muscular, CFD-designed hood, Cadillac's new performance flagship strikes many developmental balances, said Chief Engineer Tony Roma.
2014-12-16
Article
The gradual path to semi or fully autonomous drive is seen for connectivity and electromechanical hardware, with improvements to data bandwidth for maximum connectivity, enhanced GPS for greater accuracy, and mining "Big Data" needed for traffic management.
2014-12-03
Article
Although in-vehicle vulnerabilities have been identified, others exist in cloud-based systems. Public facilities, from traffic-light-controlling central computers to non-automotive infrastructure, may have little or no protection, speakers asserted.
2014-11-21
Article
General Motors on Nov. 20 announced four major personnel changes with the goal of improving customer satisfaction. The moves are effective immediately. All of the people involved have held engineering positions with the company. • Alicia Boler-Davis, currently Senior Vice President, Global Quality and Customer Experience, is named Senior Vice President, Global Connected Customer Experience. • Grace Lieblein, currently Vice President, Global Purchasing and Supply Chain, is named Vice President, Global Quality. • Steve Kiefer, currently Vice President, Global Powertrain, is named Vice President, Global Purchasing and Supply Chain. • Dan Nicholson (SAE Member, 1988), currently Executive Director of Powertrain Embedded Controls, is promoted to Global Powertrain Vice President, assuming Kiefer’s responsibility. • Mary Chan, Vice President, Global Connected Consumer, has elected to leave GM to pursue other opportunities.
2014-11-04
Article
The basic architecture of General Motors' small block V8 has remained the same since 1955, but now a new crate engine with modern-day advanced technologies is available on the aftermarket.
2014-10-29
Article
Think you know about motor oils and the latest technologies within them? Read this article.
2014-10-21
Article
General Motors claims that its 2015 Chevrolet Bi-fuel Impala running on gasoline or CNG (compressed natural gas) will be the only bi-fuel-capable sedan on the market to offer a factory warranty. It is slated to go on sale later this year at a starting price of $38,210.
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.
2014-10-06
Article
In this week's SAE Eye on Engineering, Senior Editor Lindsay Brooke takes a look at GM's new mid-size pickups, the 2015 Chevrolet Colorado and GMC Canyon. SAE Eye on Engineering can be viewed at http://youtu.be/BIrD4_0gSC4.
2014-09-16
Article
Steel, aluminum, and plastics are vying for additional assignments as automakers look for ways to lightweight vehicles to meet the U.S. government's 2025-mandated 54.5-mpg fleet average.
2014-07-15
Article
Opel recently broke ground on a €210 million expansion of its Rüsselsheim International Technical Development center (ITDC) that will be used to develop and test engines. The 36,000-m² (400,000-ft²) expansion will be completed in 2017.
2014-07-09
Article
Sixteen university teams from the U.S. and Canada will revamp a Chevrolet Camaro into an energy-efficient, eco-smart muscle car without compromise to the vehicle's performance, utility, and safety.
2014-06-24
Article
General Motors announced Tuesday several personnel changes in leadership. Cathy Clegg was appointed Vice President of North America Manufacturing, effective July 1. Clegg will lead more than 74,000 employees and will be responsible for 55 facilities, including assembly, stamping, powertrain, and component operations in the U.S., Canada, and Mexico.
2014-04-30
Article
In a move to centralize resources for better collaboration between racing and production engineers, General Motors is building the GM Performance and Racing Center (GMPRC) at its Powertrain World Headquarters in Pontiac, MI.
2014-04-22
Article
In part to improve safety performance of its vehicles and to enhance cross-system integration, General Motors is restructuring its global vehicle-engineering organization. It will now consist of two units: Global Product Integrity and Global Vehicle Components and Subsystems.
2014-04-16
Article
In the wake of its ignition switch recall, General Motors CEO Mary Barra has announced creation of a Global Product Integrity organization. Housed within the Global Production Development group, it will "build on the formula and specific actions we have taken in recent years to lead the industry in vehicle dynamics," Barra said at the 2014 New York International Auto Show.
2014-04-14
Article
Adding data buses allows new electronic features, but increases costs from wiring and modules. SAE Congress speakers suggest taking advantage of opportunities to transfer functions and merge modules; and they propose algorithms to give engineers greater choice in circuit routing through harnesses, to replace trial-and-error techniques.
2014-04-09
Article
Misfire detection is most difficult, SAE Congress panel tells attendees, and overall emissions diagnosis is harder than with passenger cars and light-duty trucks.
2014-04-01
Article
Engineering boss Pierpaolo Antonini noted several technology developments that will help maintain the diesel's viability in the face of increasingly stringent global emission regulations.
2014-04-01
Article
IMSA Tudor United SportsCar Championship promotes a variety of green technologies to link racing to the road.
Viewing 1 to 30 of 344

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