The tuning of a small four-stroke spark ignition engine for flexible valve timings through numerical approach

• Main Authors: Mohd Razali, Hanipah, M. Haziq Adham, Rosli, M., Kettner
• Format: Conference or Workshop Item
• Language: English; English
• Published: EDP Sciences 2019
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://umpir.ump.edu.my/id/eprint/24108/1/47.%20The%20tuning%20of%20a%20small%20four-stroke%20spark%20ignition.pdf; http://umpir.ump.edu.my/id/eprint/24108/2/47.1%20The%20tuning%20of%20a%20small%20four-stroke%20spark%20ignition.pdf; http://umpir.ump.edu.my/id/eprint/24108/; https://doi.org/10.1051/matecconf/201925504004
• Institution: Universiti Malaysia Pahang

Variable valve timing has been implemented by various manufacturers to improve internal combustion engine performance while operating at wide speed and load ranges. A novel flexible valve timing system for a small four-stroke engine is currently under development by Automotive Engineering Research Group (AERG) in Universiti Malaysia Pahang (UMP). In this paper, a compherenhensive intake and exhaust tuning for th flexible variable valve timing is presented. A numerical assessment has been conducted to the engine in a one dimensional engine simulation using validated simulation model. There are eight valve timing configurations investigated for the tuning for three speed regions. The simulation shows a positive and significant impact to the engine performance in three approaches; namely late intake valve closing, early intake valve closing and late exhaust valve closing. These approaches sufficiently covered the whole range of engine speeds.