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Viewing 1 to 30 of 91
2011-04-12
Journal Article
2011-01-0338
Asim Iqbal, Ahmet Selamet, Ronald Reese, Roger Vick
An ignition delay correlation was developed for a toluene reference fuel (TRF) blend that is representative of automotive gasoline fuels exhibiting two-stage ignition. Ignition delay times for the autoignition of a TRF 91 blend with an antiknock index of 91 were predicted through extensive chemical kinetic modeling in CHEMKIN for a constant volume reactor. The development of the correlation involved determining nonlinear least squares curve fits for these ignition delay predictions corresponding to different inlet pressures and temperatures, a number of fuel-air equivalence ratios, and a range of exhaust gas recirculation (EGR) rates. In addition to NO control, EGR is increasingly being utilized for managing combustion phasing in spark ignition (SI) engines to mitigate knock. Therefore, along with other operating parameters, the effects of EGR on autoignition have been incorporated in the correlation to address the need for predicting ignition delay in SI engines operating with EGR.
2011-04-12
Journal Article
2011-01-0228
Anthony George Konstantino, Mark A. Levine
This paper summarizes the Fast Fourier Transform (FFT) methodology, special equipment, set-up and testing that is recommended to properly characterize the surface of bearing journals that will not result in objectionable noise or vibration. Traditional surface profiles and finish callouts do not capture some of the key characteristics for addressing what is often the customer's greatest complaint, noise. Noise can vary based on the sensitivity of the vehicle but understanding how to accurately describe (design, test, and measure) a surface for a given vehicle can result in an optimized design and reduce process time during manufacturing. Furthermore, this paper will recommend techniques for determining the proper limits of the FFT callouts.
2011-04-12
Technical Paper
2011-01-1060
Jody Hall, Tareena Mulholland, Darryl Young, J.P. McGuire
Advanced High-Strength Steels (AHSS) have become an essential part of the lightweighting strategy for automotive body structures. The ability to fully realize the benefits of AHSS depends upon the ability to aggressively form, trim, and pierce these steels into challenging parts. Tooling wear has been a roadblock to stamping these materials. Traditional die materials and designs have shown significant problems with accelerated wear, galling and die pickup, and premature wear and breakage of pierce punches. [1] This paper identifies and discusses the tribological factors that contribute to the successful stamping of AHSS. This includes minimizing tool wear and galling/die pick-up; identifying the most effective pierce clearance (wear vs. burr height) when piercing AHSS; and determining optimal die material and coating performance for tooling stamping AHSS.
2011-04-12
Technical Paper
2011-01-1091
Jiman Han, Gary Barber, Qian Zou, Xichen Sun, Philip Seaton
Scuffing is one of the major problems that influence the life cycle and reliability of several auto components, including engine cylinder kits, flywheels, camshafts, crankshafts, and gears. Ferrous casting materials, such as gray cast iron, ductile cast iron and austempered ductile cast iron (ADI) are widely applied in these components due to their self-lubricating characteristics. The purpose of this research is to determine the scuffing behavior of these three types of cast iron materials and compare them with 1050 steel. Rotational ball-on-disc tests were conducted with white mineral oil as the lubricant under variable sliding speeds and loads. The results indicate that the scuffing initiation is due to either crack propagation or plastic deformation. It is found that ADI exhibits the highest scuffing resistance among these materials.
2008-04-14
Technical Paper
2008-01-0714
Bala Rajagopalan, Caleb Walters, Norm Parker, James Desautelle, Shannon Fehlberg
The double linear damage model developed by Manson and Halford helps to determine the knee point, which is the intersection between the two straight lines. The damage to the component is then calculated based on this knee point. The new approach mentioned in this paper helps to evaluate the damage on the component in a slightly different way. It uses the knee points as mentioned by Manson and Halford and decomposes the damage to the component for Phase I & Phase II. It then uses the equivalent damage approach and establishes the damage to the component. This will be explained with an example.
1997-02-24
Technical Paper
970157
Paul Bucklin, George Bollas, Peter LeBlanc, Zlatko Simanovic
In an effort to improve the dent resistance of exterior body panels at reduced steel thicknesses, some automobile manufacturers have pursued the application of bake hardenable steels. Unfortunately, bake hardenable steels have only been available as cold rolled or with electro-zinc or electro zinc/iron coatings. This situation has been a deterrent for those automobile manufacturers that prefer the use of hot dip galvanneal coatings. Recently, the interest in hot dip galvanneal bake hardenable steels has led to the investigation and development of this more advanced steel grade. This paper presents the results of a stamping trial and dent testing on three exposed hot dip galvannealed materials; i) Regular Ultra Low Carbon (ULC), ii) Rephosphorized ULC, and iii) Rephosphorized Bake Hardenable ULC steel.
1997-02-24
Technical Paper
970010
H. Didandeh, C. Toksoy, F. Cutler, A. Ecer, H. Fromm, P. Tejero, J. Fitzsimons, W. Robertz
The development process of a water pump impeller used on a sport utility vehicle engine is described. A review of the design process is presented in this paper including the computer-aided flow analysis together with testing procedures. By computer modeling, one can estimate the coolant flow characteristics of a given impeller blade shape for providing increased cooling performance and improved efficiency on the engine. It also provides directions for the improved design. The test data are used specifically to confirm the analysis results.
2008-03-31
Article
Three variations on a theme, the theme being environmentally responsible cars propelled by advanced powertrain systems. In a nutshell, that describes Chrysler’s intent with the three very different-looking—but technology-wise, somewhat similar—concept vehicles it revealed in January at the NAIAS.
2008-05-13
Article
The standard has seen a slow start, but it looks as if momentum for the interface between hardware and software is starting to grow. A number of electronics suppliers and their tool providers are ramping up, and automakers continue to show support.
2008-05-13
Article
The expansion of electronics and software continues almost unabated, bringing both benefits and challenges for automakers and their suppliers. As engineers develop new safety, infotainment, and powertrain systems, they are looking at a variety of techniques to manage hardware and software development.
2008-03-31
Article
Chrysler’s traditional approach to vehicle development has taken a detour as engineers recently started using bio-mimetic topology optimization and an advanced engineering process as a means of designing safer, lighter automobiles. The new process helps to identify which body-in-white zones have the highest strain as well as prime locations for the various critical load paths on the vehicle.
2012-01-09
Article
Adapted from Alfa Romeo Giulietta platform, the Dart's body and aero package is designed for class-leading Cd. Three four-cylinder engines are offered, a 1.4-L Fiat turbo Multi-Air, and two naturally aspirated Tiger Shark engines, which are versions of the Chrysler “world” engine modified for lower NVH and more torque at low rpm.
2012-03-21
Article
The drawings done by collegiate students for a steel wheel design competition had industry professionals thinking about future production possibilities.
2012-04-25
Article
OEMs need to prepare their customers’ expectations for new fuel-efficiency technologies aimed at meeting the 2017-25 CAFE standards, stressed an expert panel of engineers at the SAE 2012 World Congress. And the attribute-based standards could adversely impact sales of the smaller vehicle segments, the experts noted.
2012-04-25
Article
A worldwide shortage of engineers is threatening the auto industry’s advanced technology development, concurred a panel of powertrain executive engineers at the SAE 2012 World Congress.
2012-04-26
Article
The looming LEV III standards, which include a potential drop of particulate matter emissions to an almost imperceptible 1 mg/mi by 2025—loom like dark clouds over powertrain engineers working on gasoline direct injection (GDI) and diluted/lean-burn combustion technologies, as well as advanced diesels.
2012-09-20
Article
GM and Ford will again collaborate on transmission development, building on their great success with the GMF (6T70/75) and 6F 6-speed automatics.
2012-08-22
Article
The change to OAT is across the board for 2013 and is accompanied by increasing coolant service interval to 10 years/150,000 mi (240,000 km). The formula is different from that used by parent Fiat.
2012-08-07
Article
Using a powerful new 3-D modeling package, Chrysler Powertrain engineers and manufacturing experts are reconfiguring the Kokomo transmission plant to build the 845RFE eight-speed automatic for rear-drive vehicles beginning 4Q12 and the 948TE nine-speed fwd transaxle due to launch in 2Q13, in addition to other new powertrain programs.
2012-09-27
Article
Highlights include oil change intervals doubled to 15,000 mi (24,000 km), introduction of urea injection with selective catalyst reduction NOx controls, and class-leading diesel torque. A dual radiator configuration and two transmission oil heat exchangers are in new front-end cooling module.
2012-11-28
Article
The new compact, B-segment MPV was up-engineered by Chrysler to meet U.S. safety, emissions, and customer requirements. Powered by a 1.4-L Multiair turbocharged engine, the MY2014 model debuted at the L.A. Auto Show.
2012-11-28
Article
The battery-electric Fiat 500e features a 24-kW·h NiMgCo lithium-ion battery sourced from SB LiMotive and an 83-kW traction motor. The car is not aimed at traditional EV customers, according to Fiat's North American marketing boss.
2012-11-13
Article
SEMA VP Waraniak explains the five-step “hype cycle” for such emerging technologies as plug-in electric vehicles. Chrysler VP Gradu sees diesel as the most cost-effective choice for car performance. In the background is “Goodwin Assist,” a prototype concept to provide electric-drive assist in large vehicles, but at obviously higher cost.
2012-08-31
Article
Planning and close supplier collaboration were keys, said Chrysler VP Mircea Gradu.
2012-08-24
Article
2013 Ram truck's HFE (high fuel efficiency) model delivers 18 mpg city/25 mpg highway with help from thermal management of engine and transmission oil temperatures, featuring integration with active grille shutters.
2012-08-30
Article
Reducing a vehicle's mass opens the door for a downsized engine and transmission, a lighter cradle and body structure, smaller wheels and brakes, as well as a weight-slimmed suspension. The start point for this ripple effect is materials.
2009-12-14
Article
The industry's product plans are brimming with 1.4-L engines as a solution for meeting the new U.S. 35.5-mpg fuel efficiency standards.
2009-11-25
Article
FIRE engines and Multiair valvetrains from Italy are keys to boosting Chrysler’s fleet fuel efficiency by 2014, says new Powertrain boss Paolo Ferrero.
2009-12-16
Article
You know the price of a component, but do you know its cost? A new company provides costing details for clean-sheet designs and competitor teardowns.
2011-03-21
Article
The company drops the low-speed 83.3-kb/s bus in favor of two 125-kb/s buses, one for interior function and the other for telematics. A large center stack touch-screen display and new hands-free module are among the highlights.
Viewing 1 to 30 of 91

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