University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Dual-injection as a knock mitigation strategy using pure ethanol and methanol

Daniel, R, Wang, C, Xu, H, Tian, G and Richardson, D (2012) Dual-injection as a knock mitigation strategy using pure ethanol and methanol

Full text not available from this repository.

Abstract

For spark ignition (SI) engines, the optimum spark timing is crucial for maximum efficiency. However, as the spark timing is advanced, so the propensity to knock increases, thus compromising efficiency. One method to suppress knock is to use high octane fuel additives. However, the blend ratio of these additives cannot be varied on demand. Therefore, with the advent of aggressive downsizing, new knock mitigation techniques are required. Fortuitously, there are two well-known lower alcohols which exhibit attractive knock mitigation properties: ethanol and methanol. Both not only have high octane ratings, but also result in greater charge-cooling than with gasoline. In the current work, the authors have exploited these attractive properties with the dual-injection, or the dual-fuel concept (gasoline in PFI and fuel additive in DI) using pure ethanol and methanol. The single cylinder engine results at 1500 rpm (λ=1) show benefits to indicated efficiency and emissions (HC, CO and CO2) at almost every load (4.5 bar to 8.5 bar IMEP) compared to GDI. This is because the spark timing can be significantly advanced despite the use of relatively low blends (≤50%, by volume), which lowers the combustion duration and improves the conversion of fuel energy into useful work. Overall, these results reinforce the potential of the dual-injection concept to provide a platform for aggressive downsizing, whilst contributing to a renewable energy economy. Copyright © 2012 SAE International.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Authors :
NameEmailORCID
Daniel, RUNSPECIFIEDUNSPECIFIED
Wang, CUNSPECIFIEDUNSPECIFIED
Xu, HUNSPECIFIEDUNSPECIFIED
Tian, Gg.tian@surrey.ac.ukUNSPECIFIED
Richardson, DUNSPECIFIEDUNSPECIFIED
Date : 10 September 2012
Identification Number : 10.4271/2012-01-1152
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:39
Last Modified : 17 May 2017 15:12
URI: http://epubs.surrey.ac.uk/id/eprint/840005

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800