Caterpillar's ACERT Technology Offers Enhanced Performance & Reduced Emissions

  • December 19, 2005
  • Caterpillar Inc.
  • News
(Peoria, Ill.) -- Caterpillar announces the availability of a new line of engines for stationary diesel-fueled generator sets with breakthrough ACERT(TM) Technology. The generator sets provide a complete range of power - from 225kW to 1,000kW - 60 Hz; 250kVA - 1,100kVA - 50 Hz for standby, prime and load management applications.Addressing current and pending environmental regulations, ACERT Technology used in Cat(R) generator sets meet U.S. EPA Tier 2 and Tier 3 stationary emissions standards, and will serve as the foundation for meeting U.S. EPA Tier 4/EU Stage IIIB emission levels in 2011. "With $500 million invested in research and more than 250 patents behind it, ACERT Technology is another example of why Caterpillar continues as a world leader in power generation," said Mark W. Craig, division manager, Caterpillar Inc. Global Engine Development. "ACERT Technology is the result of a stringent new product introduction and testing process and years of investment in numerous technologies. It affords customers the ability to meet emissions standards today and in the future, without sacrificing durability, reliability and fuel economy that customers require." ACERT Technology is a synergistic approach utilizing a suite of complementary building block technologies that can be individually adapted to accommodate a specific application. Proven first with on-highway engines, the building blocks of ACERT Technology have been tailored to meet the emissions requirements for stationary diesel generator sets in a variety of applications. ACERT Technology used on a stationary Cat diesel generator set offers the advantage of a smaller footprint and increased power density, which results in lowered installation costs and more flexible installation options. For electric power generation applications, the three building blocks of ACERT Technology include integrated electronics, advanced air management and precise fuel delivery. Electronic ControlElectronics play an important role in ACERT Technology, not only in lowering emissions, but also in optimizing power and fuel economy. The ADEM(TM) A4 electronic control module sends out signals that fuel injectors convert into mechanical responses, resulting in precise fuel delivery and better response. While the software is newly developed for ACERT Technology, the engine's Electronic Control Module is also used on current Cat products. "Like the human brain sending messages to the body, the electronics ensure that all systems of ACERT Technology work together to manage the engine efficiently," explained Craig. Air SystemsAir management is the second key component of ACERT Technology, delivering cool, clean air into the combustion chamber instead of recycled heat. This results in a reduction of oxides of nitrogen, and provides better fuel economy, improved response and emissions reduction. "The system automatically adjusts to the airflow requirements on the engine, allowing for higher boost levels and increased airflow. This ultimately means better engine performance, as well as maintained fuel economy", explains Craig. Fuel DeliveryThe third and final building block of ACERT Technology is fuel delivery. In this system, fuel is introduced into the combustion chamber in a number of controlled injections to precisely regulate the combustion process. Unlike single-injection fuel delivery, this method offers the advantages of lowered peak cylinder temperatures, which allows fuel to burn more completely while simultaneously lowering NOx emissions. Additional benefits of the fuel delivery system include reduced sound and vibration. Engines with ACERT Technology in the 225 ekW to 300 ekW power range feature Caterpillar's proven electronic fuel system. The flexible HEUI fuel system provides multiple injections for low emissions with complete combustion and maximum fuel economy. Determined by the engine's electronic control module, small amounts of fuel are injected at the appropriate times to achieve fuel economy and lower emissions. Larger engines, with ranges above 300 ekW, use the Mechanically Actuated Electronically Controlled Unit Injector MEUI) fuel system that uses a multiple injection technology similar to the HEUI fuel system. "In all, ACERT Technology is a series of building blocks that provide a breakthrough engine technology built on systems and components that have been developed by Caterpillar with proven reliability," concludes Craig. Caterpillar is leading the power generation marketplace with power systems engineered to deliver flexible, expandable, reliable and cost-effective solutions. Caterpillar offers worldwide product support, with parts and service available globally through the Cat dealer network. Cat Dealer service technicians are trained to service every aspect of Cat equipment. For more than 80 years, Caterpillar Inc. has been building the world's infrastructure and, in partnership with its worldwide dealer network, is driving positive and sustainable change on every continent. With 2004 sales and revenues of $30.25 billion, Caterpillar is a technology leader and the world's leading manufacturer of construction and mining equipment, clean diesel and natural gas engines and industrial gas turbines. For more information on Cat generator sets and power systems, or to find the local Cat dealer nearest you, please visit us on the web at or email For more information on Cat Engines with ACERT Technology, please visit us on the web at

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