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

• Main Authors: Salim, W. S. I. W., Mahdi, A. A. M., Ismail, M. I., Abas, M. A., Martinez-Botas, R. F., Rajoo, S.
• Format: Article
• Language: English
• Published: Universiti Malaysia Pahang 2017
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://eprints.utm.my/id/eprint/76489/1/SRajoo2017_BenefitsofSparkIgnitionEngineFuelSaving.pdf; http://eprints.utm.my/id/eprint/76489/; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85042734521&doi=10.15282%2fjmes.11.4.2017.6.0272&partnerID=40&md5=ecc75d8887ebae9ac8604aad713ea515

This paper presents a simulation-based study to evaluate three potential benefits of fuel-saving 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. GT-Power 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 stop-start 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.