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Technical Paper
Jennifer Durfy, Sang-Bum Hong, Bibhu Mahanta
As fuel prices continue to be unstable the drive towards more fuel efficient powertrains is increasing. For engine original equipment manufacturers (OEMs) this means engine downsizing coupled with alternative forms of power to create hybrid systems. Understanding the effect of engine downsizing on vehicle interior NVH is critical in the development of such systems. The objective of this work was to develop a vehicle model that could be used with analytical engine mount force data to predict the vehicle interior noise and vibration response. The approach used was based on the assumption that the largest contributor to interior noise and vibration below 200 Hz is dominated by engine mount forces. An experimental transfer path analysis on a Dodge Ram 2500 equipped with a Cummins ISB 6.7L engine was used to create the vehicle model. The vehicle model consisted of the engine mount forces and vehicle paths that define the interior noise and vibration.
Technical Paper
Jeffrey P. Seger
This paper presents an overview of the process Cummins uses to integrate the engine and aftertreatment systems with the vehicle. This is a system integration process which assembles various subsystems such as the engine, aftertreatment, drivetrain, electronics, and cooling systems into one vehicular end product. It requires close collaboration with vehicle manufacturers and their suppliers. Given the wide range of vehicle types and applications, a robust process is needed. A synopsis of this vehicle integration process is included.
Journal Article
Carl Justin Kamp, Shawn Zhang, Sujay Bagi, Victor Wong, Greg Monahan, Alexander Sappok, Yujun Wang
Abstract Diesel engine exhaust aftertreatment components, especially the diesel particulate filter (DPF), are subject to various modes of degradation over their lifetimes. One particular adverse effect on the DPF is the significant rise in pressure drop due to the accumulation of engine lubricant-derived ash which coats the inlet channel walls effectively decreasing the permeability of the filter. The decreased permeability due to ash in the DPF can result in increased filter pressure drop and decreased fuel economy. A unique two-step approach, consisting of experimental measurements and direct numerical simulations using ultra-high resolution 3D imaging data, has been utilized in this study to better understand the effects of ash accumulation on engine aftertreatment component functionality.
After a frustrating and delay-ridden 10-year development, Nissan has unveiled its second-generation Titan--the first light-duty pickup that combines diesel V8 muscle with heavy-duty GVWR.
The Energy Department recently awarded Cummins, the nation’s only independent diesel engine maker, a two-year, $4.5-million grant to boost its previous mark by 5 percentage points to 55% brake thermal efficiency.
Cummins Emission Solutions and Cummins Turbo Technologies took advantage of the crowd at Intermat to unveil a couple of next-generation component innovations.
The off-highway equipment industry is on a clear path to introduce machines with near-zero emissions, made possible using advanced engine technologies and integrated exhaust aftertreatment. As Cummins looks ahead, perhaps an even greater challenge for the engine manufacturer is to also achieve higher fuel efficiency for the next generation of clean diesel engines.
The heavy-duty QSX engine from Cummins has been revamped to displace 16 L, and will be available with a fully integrated air intake to exhaust aftertreatment system to meet EPA Tier 4 Interim and European Stage IIIB off-highway emissions regulations in January 2011.
To optimize the fan-shroud shape to maximize cooling air mass flow rates through the heat exchangers of heavy-duty trucks, researchers from Argonne National Lab, Cummins and CD-Adapco used the Adjoint approach to optimization.
Eaton and Cummins announced a new joint venture, Eaton Cummins Automated Transmission Technologies, to design, develop, manufacture and service next-generation automated manual transmissions for heavy- and medium-duty commercial vehicles. The JV also includes current Eaton AMTs.
Cummins Inc. has acquired the emissions control assets of Hilite International in Marktheidenfeld, Germany, and made them part of Cummins Emission Solution (CES), positioning the company to serve all major market applications with a Cummins doser.
The U.S. Department of Energy recently awarded $187 million for nine projects aimed at improving vehicle efficiency. Most of the grant money, $115 million, is targeted at advances that will increase the fuel efficiency of Class 8 long-haul freight trucks 50% by 2015. Among the technologies to be investigated are engine combustion, engine waste heat recovery, powertrain hybridization, idle reduction, and aerodynamics.
The rising price of energy is expected to further increase the demand for more fuel-efficient diesel engines and also for natural gas engines—a key focus of Cummins' high-horsepower engine development programs.
At this year’s Intermat, Cummins is introducing its next-generation QSL9 engine platform, which it says will be ready to meet U.S. EPA Tier 4 Interim and EU Stage IIIB emissions regulations and do so with better performance and a lower cost of operation.
Looking beyond Tier 4 Final regulations, Cummins predicts technologies such as onboard diagnostics, telematics, various hybrid systems, and waste heat recovery methods will become more common as the industry looks toward the future of more efficient diesel power.
The rapidly growing importance of energy efficiency in almost all engine markets has presented a variety of opportunities to develop technologies to recover waste energy from engines and vehicles.
Semiconductors are tiny compared to the off-highway vehicles that carry them, but their thermal issues aren’t small. Keeping the sub-micron elements of a chip cool is a major challenge for the developers of electronic controls.
Using advanced supercomputers and the largest X-ray imaging system in the western hemisphere, the team of researchers developed and validated software models for fuel injectors. One the most difficult to understand engine phenomenon, these validated models are useful for simulating fuel injectors and are now available to engine developers.
A confident Nikola Motors CEO confirms the promising Nikola One electric Class 8 truck remains on schedule and on target in the mission to eliminate emissions from over-the-road haulers.
With its new-generation X Series modular diesel engines, Cummins promises new levels of fuel-efficiency and power, compliance with 2017 EPA greenhouse-gas emissions standards and sophisticated OTA capabilities.
Cummins Inc. has concluded its joint ventures with CNH Global N.V. and Iveco N.V. Under the new agreement, Cummins will purchase CNH’s equity stake in Consolidated Diesel Co. (CDC) and will sell its interest in the European Engine Alliance (EEA).
While the European Union’s upcoming Stage V standards will not be applicable in North America, product improvements made to meet the regulations are expected to be made available for the North American market, explains Cummins' Vice President Engineering – Engine Business, Jim Fier.
The impact of Tier 4 interim regulations goes well beyond engines, stretching to the infrastructure needed for new aftertreatment techniques and to human-machine-interface issues.
Cummins recently announced trials of future driveline concepts for off-highway equipment. Its focus is on energy diversity, providing a range of powertrain solutions for customers: clean diesel, renewables, natural gas, gasoline, hybrids and electric power, notes Shelley Knust, Executive Director - Off-Highway Engineering.
The first Cummins 9.3-L engine recently rolled off the production line at Guangxi Cummins Engine Co. Ltd., the 50:50 joint venture (JV) between Cummins Inc. and LiuGong Machinery, marking the official start of operations in Liuzhou, southern China.
Cummins Inc. claimed in a Sept. 21 announcement that it had achieved an industry milestone by commencing production and supply of the first EPA Tier 4 Interim and EU Stage IIIB certified engines and aftertreatment for early installation by off-highway equipment customers.
The EcoFit Single Module takes advantage of innovations in catalyst and urea dosing technologies unique to Cummins Emissions Solutions.
Cummins offers a next-generation QSB6.7 engine, featuring a fully integrated air intake to exhaust aftertreatment system and poised to meet EPA Tier 4 Interim and European Stage IIIB off-highway emissions regulations in January 2011.
Neil Pattison, Cummins' Director of On-Highway Engine Business for EMEA & CIS, discusses Euro 6, natural gas, and hybridization at the recent IAA Commercial Vehicles Show in Hanover.
Cummins' Jim Trueblood says the company's Tier 4 Final program was driven by the core philosophy to utilize new or improved technologies, systems, and components that would meet the durability and reliability levels demanded for tough high horsepower applications.
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