Abstract
Multimode engine operation uses two or more combustion modes to maximize engine efficiency across the operational range of a vehicle to achieve higher overall vehicle fuel economy than is possible with a single combustion mode. More specifically for this study, multimode solutions are explored that make use of boosted SI under high load operation and other advanced combustion modes such as advanced compression ignition (ACI) under part-load conditions to enable additional engine efficiency improvements across a broader range of the engine operating map. ACI combustion has well-documented potential to improve efficiency and emissions under part-load operation but poses challenges that limit full engine speed-load range. This study investigates the potential impact of ACI operational range on simulated fuel economy to help focus research on areas with the most opportunity for improving fuel economy. These simulations make use of a vehicle model, discretized engine data, and employ a systematic exploration of ACI operational range to estimate multimode fuel economy for a mid-size passenger vehicle over U.S. Environmental Protection Agency's Urban Dynamometer Driving Schedule. The results of this study highlight operational ranges with the highest potential fuel economy and correspondingly areas of focus for multimode research and ACI engine operation1.
| Original language | English |
|---|---|
| Journal | SAE Technical Papers |
| Volume | 2020-April |
| Issue number | April |
| DOIs | |
| State | Published - Apr 14 2020 |
| Event | SAE 2020 World Congress Experience, WCX 2020 - Detroit, United States Duration: Apr 21 2020 → Apr 23 2020 |
Funding
This research was supported by the U.S. DOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office and used resources at the National Transportation Research Center, a DOE-EERE User Facility at Oak Ridge National Laboratory. The authors would gratefully like to thank the U.S. DOE Co-Optima Program Managers Kevin Stork and Alicia Lindauer for the support and guidance for this work. In addition, the Co-Optima Leadership and Extended Leadership teams provided valuable feedback on the scope, direction and presentation of the results. There was additional feedback on the overall impact of this work by the Co-Optima External Advisory Board and the Industry Stakeholder group. Thanks to Jaret Zuboy for providing additional input into the content of the work. 1 An industry-led example of the use of multimode was the Bosch Advanced Combustion Controls Enabling Systems and Solutions (ACCESS) program which was supported by the U.S. Department of Energy (DOE) [, ]. shows an example of the Bosch ACCESS multimode strategy that uses a base SI platform with an HCCI multimode strategy and a SACI regime. A demonstration vehicle was also completed for that project.
| Funders | Funder number |
|---|---|
| DOE-EERE | |
| U.S. Department of Energy | |
| Office of Energy Efficiency and Renewable Energy | |
| Oak Ridge National Laboratory |
