Benchmarking a 2018 Toyota Camry 2.5-liter Atkinson Cycle Engine with Cooled-EGR 2019-01-0249
As part of the U.S. Environmental Protection Agency’s (EPA’s) continuing assessment of advanced light-duty automotive technologies in support of regulatory and compliance programs, a conventional 2018 Toyota Camry with a 4-cylinder 2.5-liter naturally aspirated Atkinson engine with cooled-EGR was benchmarked. The engine was tested on an engine dynamometer with and without its 8-speed transmission with the engine wiring harness tethered to its vehicle parked outside the test cell. Engine and transmission torque, fuel flow, key engine temperatures and pressures, and onboard diagnostics (OBD)/epid CAN bus data were recorded. This paper documents the test results under idle, low, medium and high load engine operation, as well as motoring torque, wide-open throttle torque and fuel consumption during transient operation using both EPA Tier 2 and Tier 3 test fuels. The design and performance of this 2018 2.5-liter engine is described and compared to Toyota’s published data and to EPA’s previous projections of the efficiency of an Atkinson engine with cooled-EGR.
John Kargul, Mark Stuhldreher, Daniel Barba, Charles Schenk, Stanislav Bohac, Josh Alden, Joseph McDonald, Paul Dekraker
US Environmental Protection Agency, US Government, Southwest Research Institute