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Viewing 1 to 30 of 104
2016-11-04
Article
The 3500E, the latest iteration of Caterpillar’s venerable 3500 engine family, also provides enhanced durability and longer life before overhauls, and it maintains existing form factors, so rebuilds and replacements can be utilized with minimal infrastructure changes.
2016-04-14
Article
Manufacturing and service teams are discovering ways to use AR technology to handle complex systems like wire harnesses.
2016-04-05
Technical Paper
2016-01-0571
Guillaume Bernard, Mark Scaife, Amit Bhave, David Ooi, Julian Dizy
Abstract Internal combustion (IC) engines that meet Tier 4 Final emissions standards comprise of multiple engine operation and control parameters that are essential to achieve the low levels of NOx and soot emissions. Given the numerous degrees of freedom and the tight cost/time constraints related to the test bench, application of virtual engineering to IC engine development and emissions reduction programmes is increasingly gaining interest. In particular, system level simulations that account for multiple cycle simulations, incylinder turbulence, and chemical kinetics enable the analysis of combustion characteristics and emissions, i.e. beyond the conventional scope of focusing on engine performance only. Such a physico-chemical model can then be used to develop Electronic Control Unit in order to optimise the powertrain control strategy and/or the engine design parameters.
2016-04-04
Article
This past November Caterpillar opened its new Additive Manufacturing (AM) Factory at its Tech Center in Mossville, IL, to consolidate and expand its 3D printing activities. AM engineer Brittany Hancock recently gave Off-Highway Engineering a tour of the new facility and discussed the company’s current and future plans regarding the use of 3D printing technology.
2016-01-08
Article
Most electric off-highway vehicles are relatively small vehicles that have small power requirements compared to some construction and agriculture behemoths. Hybrids fit more use cases.
2015-12-08
Article
Fuel-efficiency gains result primarily from the D6N's new transmission with a lock-up clutch torque converter that seamlessly selects the drive mode best suited to the application.
2015-09-29
Technical Paper
2015-01-2851
Aleksandar Egelja, Darren Allan Blum, Kalpesh N. Patel
Abstract Many off-highway machines, including hydraulic excavators, perform cyclical motion in their everyday activities where there is significant acceleration, deceleration, load lifting and hydraulic implement lowering. During that time in conventional off-highway machinery, most of the potential or kinetic energy is dissipated as heat instead of being captured and reused. When these opportunities are well understood and consequently machine systems are designed and integrated properly, fuel efficiency improvements could reach double digit values. It should be noted that the mentioned machine efficiency improvements will still vary depending on the machine size, its application and the characteristics of machine system(s) being applied. An approach for excavator energy flow analysis, coupled with rapid machine control design changes directed to minimization of energy losses is discussed.
2015-08-06
Article
New PL72, PL83, and PL87 pipelayers feature differential steering and an electronically controlled hydraulic system that places total control of lifting functions into a single joystick. A dash-mounted LCD display provides onboard diagnostic information for the operator.
2015-06-30
Article
Off-highway machine mounting systems, especially the cab mounting system, significantly affect the operator comfort in the cab by providing enough damping for a good ride and isolating the structure-borne forces from traveling into the cab.
2015-06-15
Article
Caterpillar's grown-up 336F L XE Hybrid features an integrated design that conserves fuel, optimizes performance, and captures and reuses energy, while holding the operator comfortable.
2015-04-24
Article
As connectivity expands throughout the transportation industry, it’s transforming security from door locks to firewalls and antivirus programs. Aircraft and ground vehicle representatives discussed the topic during the “Technical Expert Panel Discussion: With connectivity, comes risks - cybersecurity and safety” at the 2015 SAE World Congress.
2015-04-14
Technical Paper
2015-01-1693
Mark Allen, Graham Hargrave, Petros Efthymiou, Viv Page, Jean-Yves Tillier, Chris Holt
Abstract It is an engineering requirement that gases entrained in the coolant flow of an engine must be removed to retain cooling performance, while retaining a volume of gas in the header tank for thermal expansion and pressure control. The main gases present are air from filling the system, exhaust emissions from leakage across the head gasket, and also coolant vapour. These gases reduce the performance of the coolant pump and lower the heat transfer coefficient of the fluid. This is due to the reduction in the mass fraction of liquid coolant and the change in fluid turbulence. The aim of the research work contained within this paper was to analyse an existing phase separator using CFD and physical testing to assist in the design of an efficient phase separator.
2015-01-30
Article
Performance and technology improvements are key benefits of the new F-Series pavers.
2014-12-15
Article
After first appearing on jobsites in 2009, Caterpillar’s latest D7E dozers feature three new “productivity boosting” dozing features for optimized performance during grading work.
2014-12-09
Article
When vehicles start handling multiple aspects of driving, electronic controls won’t always rely solely on input from onboard sensors. Often, antennas will point skyward to bring in information from GPS satellites and telematic systems.
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
2014-01-1533
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.
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
Journal Article
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.
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.
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].
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.
Viewing 1 to 30 of 104

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