Industry Resources // Tier 4 Emissions Resources // Tier 4 Emissions Acronyms
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TIER 4 EMISSIONS ACRONYMS

On this page, you'll find a list of the commonly used terms and acronyms that you are likely to encounter when discussing or reading about Tier 4 emissions requirements and technologies. Use the comment form at the bottom of the page to ask questions or make suggestions for this list.
Tier 4 Emissions Acronyms
 Here is a list of the commonly used acronyms related to Tier 4 emissions requirements and technologies. Some of the terms are linked to non-technical explanations and additional information.
    ACERT    ACERT Technology
    ATAAC    Air-To-Air Aftercooler
    ATCM    Airborne Toxic Control Measures
    CCB    Closed-circuit Breather
    CDPF    Catalyzed Diesel Particulate Filter
    CEM    Clean Emissions Module
    CO    Carbon Monoxide
    CRS    Caterpillar Regeneration System
    CRT    Continuously Regenerating Trap
    CCRT    Catalyzed CRT – giving a wider operating range
    DEF    Diesel Exhaust Fluid (i.e., Urea)
    DFA    Delegated Final Assembly
    DOC    Diesel Oxidation Catalyst
    DPF    Diesel Particulate Filter
    ECU    Electronic Control Unit
    EGR    Exhaust Gas Recirculation
    EPA    Environmental Protection Agency
    EU    European Union
    HC    Hydrocarbons
    HCCI    Homogeneous-Charge Compression Ignition
    iEGR    Internal Exhaust Gas Recirculation
    JWAC    Jacket Water Aftercooling
    MEUI    Mechanical Electronic Unit Injection
    NOx    Oxides of Nitrogen
    NO2    Nitrogen Dioxide
    NSPS    New Source Performance Standards
    NRS    NOx Reduction System
    NTE    Not To Exceed (emissions limits)
    OCV    Open Crankcase Ventilation
    PM    Particulate Matter
    ppm    Parts Per Million
    RF    Radio Frequency
    SCAC    Separate Circuit Aftercooling
    SCR    Selective Catalytic Reduction
    SO2    Sulphur Dioxide
    SOF    Soluble Organic Fraction
    ULSD    Ultra-Low Sulphur Diesel
    VGT    Variable Geometry Turbocharger



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