Comparison of Promising Sustainable C1-Fuels Methanol, Dimethyl Carbonate, and Methyl Formate in a DISI Single-Cylinder Light Vehicle Gasoline Engine
- Delivery
- Provide download link
- Format
- Price
- Non-members (tax incl.)：￥6,600 Members (tax incl.)：￥5,280
- Paper/Info type
- SAE Paper
No.2021-01-1204
- Pages
- 1-22(Total 22 p)
- Date of publication
- Sep 2021
- Publisher
- SAE International
- Language
- English
- Event
- SAE Powertrains, Fuels & Lubricants Digital Summit
Detailed Information
| Author(E) | 1) Sebastian Blochum, 2) Felix Fellner, 3) Markus Mühlthaler, 4) Martin Härtl, 5) Georg Wachtmeister, 6) Naoki Yoneya, 7) Henning Sauerland |
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| Affiliation(E) | 1) Technical University of Munich, 2) Technical University of Munich, 3) Technical University of Munich, 4) Technical University of Munich, 5) Technical University of Munich, 6) Hitachi Ltd, 7) Hitachi Europe GmbH |
| Abstract(E) | On the way to a climate-neutral mobility, synthetic fuels with their potential of CO2-neutral production are currently in the focus of internal combustion research. In this study, the C1-fuels methanol (MeOH), dimethyl carbonate (DMC), and methyl formate (MeFo) are tested as pure fuel mixtures and as blend components for gasoline. The study was performed on a single-cylinder engine in two configurations, thermodynamic and optical. As pure C1-fuels, the previously investigated DMC/MeFo mixture is compared with a mixture of MeOH/MeFo. DMC is replaced by MeOH because of its benefits regarding laminar flame speed, ignition limits and production costs. MeOH/MeFo offers favorable particle number (PN) emissions at a cooling water temperature of 40 °C and in high load operating points. However, a slight increase of NOx emissions related to DMC/MeFo was observed. Both mixtures show no sensitivity in PN emissions for rich combustions. This was also verified with help of the optical engine. DMC was also used as a blend component for gasoline. Advantages in PN emissions, knock resistance and injector tip coking were observed. Furthermore, to evaluate resistance against abnormal combustions of pure C1-fuels, two knock resistant fuels, toluene and pure MeOH were used as reference. Resistance against abnormal combustions was investigated at the operating point at 1500 rpm / 17 bar IMEP / ε = 14.91 with the Tintake increased until initial abnormal combustions were detected. Finally, DMC/MeFo was used in a scavenged pre-chamber to determine the potential of the ultra-low soot combustion inside the pre-chamber. Therefore, the lean limit of DMC/MeFo was extended to λ = 2.2 and an indicated efficiency of more than 41 % was achieved at 7 bar IMEP. |
