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Viewing 1 to 30 of 354
2015-06-25
Article
GM's best-selling global product, the new Cruze shifts to the D2XX compact platform--a move helps create a roomier vehicle while weighing less than the outgoing model.
2015-05-18
Article
Using the benchmark Alpha mixed-materials architecture that it pioneered on Cadillac ATS, GM takes over 200 lb out of the admittedly overweight 2015 Camaro and adds its first turbocharged four-cylinder powertrain.
2015-04-24
Article
Initial focus is on battery, starter, and fuel pump to provide early warnings of impending issues with starting a car, as discussed in a 2015 SAE World Congress panel. The 4G connection in 2016 Chevrolets obtains data, cloud server holds the analysis algorithms.
2015-04-21
Article
Although 30% of traffic fatalities are alcohol-related, and electronic Driver Alcohol Detection System for Safety has appeal, more targeted approaches to reducing them are being taken by car makers. Programs aimed at reducing teen driver accidents and death were described at the 25th annual World Traffic Safety Symposium during the New York Auto Show.
2015-04-14
Technical Paper
2015-01-0944
Maryam Moulai, Ronald Grover, Scott Parrish, David Schmidt
Abstract A computational and experimental study was performed to characterize the flow within a gasoline injector and the ensuing sprays. The computations included the effects of turbulence, cavitation, flash-boiling, compressibility, and the presence of non-condensible gases. The flow domain corresponded to the Engine Combustion Network's Spray G, an eight-hole counterbore injector operating in a variety of conditions. First, a rate tube method was used to measure the rate of injection, which was then used to define inlet boundary conditions for simulation. Correspondingly, injection under submerged conditions was simulated for direct comparison with experimental measurements 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
Journal Article
2015-01-1570
Daniel Vilela, Rubens Pinati, Scott Larsen, Erick Rodrigues, Renato Serrati
Abstract This study presents the comparison of vehicle handling performance results obtained using physical test tire data and a tire model 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
Journal Article
2015-01-0194
Hua Zeng, Isao Hoda, William Ivan, Andrew Baker, Syed Kadry, Hiroki Funato, Jia Li, Masayoshi Takahashi, Hideyuki Sakamoto, Ryuichi Saito
Abstract Electromagnetic compatibility (EMC) is becoming more important in power converters and motor drives as seen in hybrid electric vehicles (HEV) to achieve higher reliability of the vehicle and its components. Electromagnetic interference (EMI) of the electronic components for a vehicle are evaluated and validated at a component-level test bench; however, it is sometimes observed that the EMI level of the components can be changed in a vehicle-level test due to differences in the vehicle's configuration (cable routing, connecting location etc.). In this presentation, a vehicle-level EMC simulation methodology is introduced to estimate radiated emissions from a vehicle. The comparison between the simulation and measurement results is also presented and discussed.
2015-04-14
Journal Article
2015-01-1152
Brendan M. Conlon, Trevor Blohm, Michael Harpster, Alan Holmes, Margaret Palardy, Steven Tarnowsky, Leon Zhou
Abstract The Chevrolet Volt is an electric vehicle (EV) with extended-range (ER) that is capable of operation on battery power alone, and on power generated by an on-board gasoline engine after depletion of the battery charge. For 2016, GM has developed the next generation of the Volt vehicle and “Voltec” propulsion system. Building on the experience of the first generation Volt, the second generation targeted improved all-electric range, improved charge sustaining fuel economy, and improved performance. All of this was to be accomplished while maintaining the EV character of the first generation Volt which customers clearly valued. This paper describes the next generation “Voltec” system and the realized improvements in efficiency and performance. 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.
2015-04-14
Technical Paper
2015-01-1357
James A. Crowley
Abstract 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. The mathematics behind the creation of both one sided and two sided loss functions is based on Binary Logistic Regression [1,2,3] Analysis Techniques.
2015-04-14
Journal Article
2015-01-0680
Rong Zhang, Qian Zou, Gary Barber, Ben Zhou, Yucong Wang
Abstract In practice, the piston wrist pin is either fixed to the connecting rod or floats between the connecting rod and the piston. The tribological behavior of fixed wrist pins have been studied by several researchers, however there have been few studies done on the floating wrist pin. A new bench rig has been designed and constructed to investigate the tribological behavior between floating pins and pin bore bearings. The experiments were run using both fixed pins and floating pins under the same working conditions. It was found that for fixed pins there was severe damage on the pin bore in a very short time (5 minutes) and material transfer occurs between the wrist pin and pin bore; however, for the floating pin, even after a long testing time (60 minutes) there was minimal surface damage on either the pin bore or wrist pin.
2015-04-09
Article
Cadillac vs. Lincoln is one of the world's great automotive rivalries. In this episode of SAE Eye on Engineering, Senior Editor Lindsay Brooke looks at the new Cadillac CT6 and Lincoln Continental. SAE Eye on Engineering can be viewed at https://youtu.be/KzKcvY8wiKg.
2015-04-08
Article
Rear- and forward-facing cameras have made big inroads, but cameras that monitor interiors haven’t seen much acceptance. That may change, driven partially by the shift to semi-autonomous driving.
2015-04-01
Article
To equip its flagship sedan for the challenge, Cadillac designers and engineers have built the CT6 on a unique vehicle architecture, an aluminum-intensive body structure that is fully one-third steel. Twenty-one patents are pending for the new full-size, rear-wheel-drive, transverse-engine configuration, a variation of GM’s Omega II platform.
2015-04-01
Article
GM's all-new premium flagship sedan is about 200 lb (91 kg) lighter than the BMW 5 Series but offers the interior volume of the short-wheelbase 7 Series, thanks to what is arguably the industry’s most aggressive combination of lightweight materials, forming technologies, and new joining methods in a non-exotic sedan.
2015-03-27
Article
Sales of diesel-powered light vehicles are up 70% and the latest engines are cleaner than ever. But the diesel industry still faces significant headwinds to greater penetration.
2015-03-23
Article
While many automakers are adding more and more gears to their transmissions, others are going gearless. In this episode of SAE Eye on Engineering, Senior Editor Lindsay Brooke looks at the gearless CVT (Continuously Variable Transmission).
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.
Viewing 1 to 30 of 354

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