Benefits of spark-ignition engine fuel-saving technologies under transient part load operations

W.S.I.W. Salim; A.A.M.  Mahdi; M.I. Salim; M.A. Abas; R.F. Martinez-Botas; S. Rajoo

doi:10.15282/jmes.11.4.2017.6.0272

Authors

W.S.I.W. Salim Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400, Parit Raja, Johor, Malaysia
A.A.M. Mahdi Faculty of Mechanical & Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400, Parit Raja, Johor, Malaysia
M.I. Salim Imperial College London, South Kensington, London, SW7 2AZ
M.A. Abas Low Carbon Transport Research Centre, Universiti Teknologi Malaysia 81310 Johor Bahru, Johor, Malaysia
R.F. Martinez-Botas Imperial College London, South Kensington, London, SW7 2AZ
S. Rajoo Low Carbon Transport Research Centre, Universiti Teknologi Malaysia 81310 Johor Bahru, Johor, Malaysia

DOI:

https://doi.org/10.15282/jmes.11.4.2017.6.0272

Keywords:

Fuel economy; cylinder deactivation; stop-start system; engine downsizing; transient part-load operations.

Abstract

This paper presents a simulation-based study to evaluate three potential benefits of fuelsaving technologies implemented in spark-ignition (SI) engines for a passenger car over actual urban driving cycles. These technologies include cylinder deactivation (CDA), stop-start system, and engine downsizing (≈20% degree of downsizing). The aim of the work is to evaluate individual benefits of each system in terms of fuel consumption. GTPower engine simulation tool is utilised to model engines which employ each of the mentioned technologies; each of the engines has identical full-load torque characteristics. Each engine model is instructed to run over a transient, part-load, torque driven operations based on actual road test measurements, and the cycle-averaged fuel consumption was evaluated. From the analysis, the contribution of each technology in terms of fuel economy can be assessed based on an actual part-load transient operation, which can be beneficial to developers to optimise the operation of SI engines. The results revealed stopstart system to be the most promising technology for the driving cycle at hand with 27.5% fuel consumption improvement over the baseline engine. CDA engine allows for 12.6% fuel economy improvement. On the other hand, the downsized turbocharged engine has caused increasing cycle fuel consumption by 7.5%. These findings are expected to be valid for typical urban driving cycles as far as they conform to the operating load residency points over the transient torque profile.

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