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Vehicle and Fuel Emissions Testing

Test Data for Light-duty Greenhouse Gas (GHG) Technology

Overview of Light-duty GHG Technology Test Data

Starting in 2012, National Vehicle and Fuel Emissions Laboratory's (NVFEL's) National Center for Advanced Technology (NCAT) developed a special test program to deepen EPA’s technical assessment of key light-duty vehicle technologies, such as small boosted engines, high compression ratio naturally-aspirated engines, 8/9/10-speed transmissions, and hybrids. Data from these tests are integrated into the Advanced Light-Duty Powertrain and Hybrid Analysis (ALPHA) Tool, used to predict the GHG reductions possible from various combinations of vehicle technologies.

Both test data and ALPHA outputs are used to inform the Midterm Evaluation (MTE) of Light-Duty Vehicle GHG Emissions Standards for Model Years 2022-2025. The MTE will be conducted through a collaborative, data-driven, and transparent process. The documentation of the test data on this page is part of EPA’s commitment to transparency in the MTE process.

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Overview of Testing and Integration with Modeling

NCAT has integrated benchmarking and modeling activities to ensure robust data.

The following presentation highlights the benchmarking and modeling activities relating to light-duty GHG emissions.

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Test Data

NCAT has put together a series of data packets describing test procedures and providing results for various advanced technology components. Additional data will be posted here as the data packets are released.

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Engine Mapping Process Documents

Integrating test data and modeling results for engines into the ALPHA model requires a process for translating test results into a full map representing all phases of engine operation. The following documents explain the process for creating ALPHA engine maps for key engine packages.

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Publications concerning Test Data

Throughout the MTE process, EPA’s goal is to publish as much of our research as possible in peer-reviewed technical papers and journals. The following publications present the test articles, test procedures, and test results from the EPA benchmarking activities in more detail.

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