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Viewing 1 to 30 of 89
2014-09-22
Article
Internal combustion engines are poised for dramatic breakthroughs in improving efficiency with lower emissions, due in part to low-temperature combustion regimes. Such regimes show great efficiency and emissions potential, but they present optimization and control challenges.
2014-09-22
Article
For the M318F and M320F, customers specified quality and reliability, low operating costs, durability, and operator comfort and safety.
2014-06-18
Article
Motivated by the untapped potential of high-performance computing tools for engine simulations, personnel from Convergent Science, Caterpillar Inc., and Argonne National Laboratory combined forces to carry out a series of engine simulations including a simulation of nearly 34 million cells that is believed to be the largest-ever diesel engine simulation.
2014-06-16
Article
The 990K features a redesigned cab that delivers an enhanced operator interface and a quiet environment, and several new features to promote operator and maintenance technician safety and performance.
2014-04-17
Article
Caterpillar has selected from a portfolio of engine and aftertreatment technologies to meet the latest emissions standards, while providing optimum value in each power range.
2014-04-01
Technical Paper
2014-01-1431
Kenth Svensson, Chad Koci
Abstract The characterization of fuel injector orifices is important for engine performance engineers, combustion engineers, and as input into 3-D spray and combustion simulations. Typical steady flow measurements done by fuel injector manufacturers are not indicative of their flow at engine injection pressures. Orifice characterization is commonly done on a rate bench or for further detail by using momentum rate measurements. The common Bernoulli equation assumptions made for momentum rate measurements are not always proper. This work compares the common approach with a more detailed approach for calculating the nozzle flow coefficients and sac pressure. The detailed approach includes friction and contraction pressure losses. A discussion on sac velocity is included. A non-iterative calculation of the Darcy friction factor is reviewed and an uncertainty analysis is also provided.
2014-04-01
Technical Paper
2014-01-1533
Zakwan Skaf, Timur Aliyev, Leo Shead, Thomas Steffen
Abstract Selective Catalytic Reduction (SCR) is a leading aftertreatment technology for the removal of nitrogen oxide (NOx) from exhaust gases (DeNOx). It presents an interesting control challenge, especially at high conversion, because both reagents (NOx and ammonia) are toxic, and therefore an excess of either is highly undesirable. Numerous system layouts and control methods have been developed for SCR systems, driven by the need to meet future emission standards. This paper summarizes the current state-of-the-art control methods for the SCR aftertreatment systems, and provides a structured and comprehensive overview of the research on SCR control. The existing control techniques fall into three main categories: traditional SCR control methods, model-based SCR control methods, and advanced SCR control methods. For each category, the basic control technique is defined. Further techniques in the same category are then explained and appreciated for their relative advantages and disadvantages.
2014-04-01
Technical Paper
2014-01-1246
D. Ryan Williams, Chad Koci, Scott Fiveland
Driven by the desire to implement low-cost, high-efficiency NOx aftertreatment systems, such as Three Way Catalysts (TWC) or Lean NOx Traps (LNT), a novel 6-Stroke engine cycle was explored to determine the feasibility of implementing such a cycle on a compression ignition engine while continuing to deliver fuel efficiency. Fundamental questions regarding the abilities and trade-offs of a 6-stroke engine cycle were investigated for near-stoichiometric and lean operation. Experiments were performed on a single-cylinder 15-liter (equivalent) research engine equipped with flexible valvetrain and fuel injection systems to allow direct comparison between 4-stroke and 6-stroke performance across multiple hardware configurations. 1-D engine simulations with predictive combustion models were used to support, iterate on, and explore the 6-stroke operation in conjunction with the experiments. Output from the experiments and simulations were then used to perform Availability and Energy balances for a thermodynamic comparison of the two cycles.
2013-12-06
Article
The company says its Cat Connect Solutions is a new framework for construction technologies and services that will help customers monitor, manage, and enhance operations and gain more control of the job site.
2013-09-24
Technical Paper
2013-01-2439
Eldon Brasche
Since 1992, Caterpillar has invested millions of dollars to purchase CAD software, and spends nearly $2M per year keeping its engineers up-to-date, via instructor lead training (ILT), as new enhancements are introduced. Periodic upgrades to the software also require huge resource (people, costs) commitments for the planning and execution of the training requirements required for a large global workforce. This paper will examine gaps uncovered in the efficiency and effectiveness of the current training process, and the cultural change required as a result of switching from an instructor led environment to a completely web-based solution, which, once deployed, had promised to change the way Caterpillar approached training for the future. The proposed change promised to improve human resource capability by utilizing new technological capabilities, and resulted in improvements in organizational capabilities as well. Topics reviewed include: Reasons for initiating the change, including perceptions of the as-is process (voice of the customer), and pros/cons of the current state.
2013-09-24
Technical Paper
2013-01-2434
Keshav Sud, Sabri Cetinkunt, Scott Fiveland
This paper uses a one-dimensional (1-D) simulation based approach to compare the steady state and transient performance of a Split Cycle Clean Combustion (SCCC) diesel engine to a similarly sized conventional diesel engine. Caterpillar Inc's one-dimensional modeling tool “Dynasty” is used to convert the simulation model of Caterpillar's current production turbocharged diesel engine Cat® C4.4 (used in their Hydraulic Excavator 316) to operate on the SCCC cycle. Steady state and transient engine performance is compared between the two engine variants. This study is focused only on the performance aspects of engine and relies on the other independently published papers for emissions prediction. This paper also demonstrates the use of Caterpillar's proprietary modeling software Dynasty to replicate the two cylinder SCCC engine model presented by University of Pisa in their paper [2]. We compare the results from our 1-D model to their Computational Fluid Dynamics (CFD) model to ensure accuracy of results and validate our modeling methodology.
2013-07-17
Article
Caterpillar's new waste handler configuration optimizes the M318D MH for high productivity in confined work areas.
2013-06-28
Article
The consulting company demonstrated a highly engineered, high-tech upgrade to an energy storage system that is thousands of years old.
2013-05-17
Article
Caterpillar chooses hydraulic hybrid technology rather than electric hybrid technology for its 336E H.
2013-04-09
Article
Caterpillar Inc. recently opened its 23,000-m2 (247,570-ft2) powertrain facility in Wuxi to produce axles, transmissions, and final drives for use in a range of Caterpillar earthmoving and mining machinery.
2013-04-08
Technical Paper
2013-01-0156
Haotian Wu, Haiyan Zhang, Vahid Motevalli, Yili Qian, Alexander Wolfe
It is a time and cost consuming way to physically develop Hybrid Electric Vehicle (HEV) supervisor controller due to the increasing complexity of powertrain system. This study aims to investigate the HEV supervisor controller development process using dSPACE midsize Hardware in the Loop simulation system (HIL) for HEV powertrain control. The prototyping controller was developed on basis of MircoAutoBox II, and an HIL test bench was built on midsize HIL machine for the purpose of verification. The feasibility and capability of HIL were attested by the prototyping control strategy and fault modes simulation. The proposed approach was demonstrated its effectiveness and applicability to HEV supervisor controller development.
2013-02-11
Article
The 450F is said to include more horsepower, efficient electronic control of the hydraulic system, serviceability improvements, and added operator comfort and convenience.
2012-12-28
Article
The hybrid technology used in the 336E H was developed by Caterpillar in-house and is used to move the machine's upper structure.
2012-12-20
Article
To better tailor compactor designs to individual environments, Caterpillar has been using Abaqus FEA from Simulia, the Dassault Systèmes application for realistic simulation.
2012-12-06
Article
OEMs and their suppliers are creating new hydraulic systems and components, using new fluids and remanufacturing to save energy and reduce the environmental impact of off-highway equipment.
2012-11-26
Article
With a broad product range and competitive pressures, Caterpillar is increasingly relying on CAE simulation to enhance product development. One of its simulation managers is seeing the advent of stochastic simulation to further enhance that development.
2012-10-02
Article
Government/industry team to study parasitic losses derived from waste energy expended in the agitation of the lubricating oil and surface-to-surface component friction, which together can account for more than a tenth of overall vehicle energy losses.
2012-10-01
Article
New track-type tractor includes improvements in blade control, fuel economy, productivity, and emissions control.
2012-04-13
Article
Functionality cannot be compromised inside heavy trucks, but their cabs increasingly mesh practicality with passenger-car sensibilities for comfort and ambience.
2012-03-19
Article
Horiba Automotive Test Systems (ATS) has been contracted by Caterpillar Inc. to provide three heavy-duty test cells and one generator test system for the company’s new production base in Tianjin, China, by the start of production in January 2013.
2012-03-16
Article
The rapid evolution of sensors, processors, and software is making unmanned ground vehicles viable in applications as diverse as mining and battlefields.
2012-02-21
Article
New Tier 4 engines, hydrostatic drive systems, and Z-bar loader linkages are some of the features that Caterpillar has designed into its next-generation wheel loaders.
2012-02-14
Article
As Chief Technology Officer and Vice President with responsibility for the Product Development & Global Technology Division, Tana L. Utley has been focused on solving the technical challenges of reducing diesel engine emissions in accordance with U.S. EPA and equivalent global regulations.
2012-01-09
Article
Long-term operation with B20 at the current specification limits for alkali and alkaline earth metal impurities can adversely impact the performance of DOC, DPF, and SCR systems.
2011-12-16
Article
Caterpillar Inc. plans to build a new, $150 million engine manufacturing facility in India that will produce Perkins-branded 4000 Series engines. A company spokesman told SAE Off-Highway Engineering that Caterpillar is “still not in a position to publically announce the location of the new facility,” and he declined to share the plant’s expected production volume.
Viewing 1 to 30 of 89

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