Potential Fuel Economy Improvements from the Implementation of cEGR and CDA on an Atkinson Cycle Engine

Paper #:
  • 2017-01-1016

Published:
  • 2017-03-28
Abstract:
For the upcoming Midterm Evaluation of EPA’s 2017-2025 Light-Duty Vehicle greenhouse gas emissions regulation, EPA has been benchmarking engines and transmissions to generate inputs for use in its technology assessment. As part of the technology assessment, cooled external exhaust gas recirculation (cEGR) and cylinder deactivation (CDA) were evaluated on an engine capable of running the Atkinson cycle. The base engine was a production 2.0L four cylinder engine with 75 degrees of intake phase authority and a 14:1 geometric compression ratio. An open ECU and cEGR hardware were installed on the engine so that the technology effectiveness could be evaluated. Once a steady state calibration was complete, two-cycle fuel economy estimates were made using fuel weighted modes and ALPHA (EPA’s full vehicle simulation model). Additionally, two cylinders were deactivated to determine what two-cycle fuel economy benefits could be achieved. This paper presents the implementation of cEGR and CDA on an Atkinson engine. Steady state fuel consumption maps are used to estimate the technologies’ potential fuel economy improvements over the FTP and Highway tests. Fuel weighted modes were used to determine possible fuel economy improvement of a current vehicle. The fuel map was used in ALPHA to evaluate potential fuel economy benefits of the technology in a future vehicle.
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