This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Flexible valve timing strategies for boosting a small four-stroke spark ignition engine performance
Technical Paper
2019-32-0591
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Variable valve timing (VVT) technology has been successful in enhancing internal combustion (IC) engine performance. VVT offers an additional control on engine breathing so that the engine operating conditions may be tailored more precisely hence, output and performance are amplified. In this paper, an approach of boosting IC engine performance through flexible valve timing (FVT) is presented. A numerical baseline model was developed using onedimensional numerical simulation tool based on a 65cc four-stroke gasoline engine. The flow coefficient values of intake and exhaust ports were obtained from flow bench experiments. The baseline model was validated against specification from manufacturer and results from previous research. This model undergone performance tuning to obtain the power and torque curves for the whole engine speed range. Next, performance optimization was conducted through design of experiments (DoE) with the target of boosting the torque and power of the baseline model between 5 to 10% for the engine speed from 1,500 until 6,000rpm. This was obtained through the variation of intake and exhaust valves timing as well as maximum lift using a full factorial experiment with three levels. The DoE experiments have identified several optimum FVT profiles. The result has shown an increase of up to 13% in brake power than the baseline. Volumetric efficiency is improved resulting in corresponding BMEP amplification. Finally, the potential of FVT system implementation is illustrated through laboratory prototype linear motor direct actuation system. The linear motor motion control preliminary testing has shown 4 to 11% difference between the demand and actual positions of the valve closing position. In conclusion, this study has shown high potential of FVT strategies which can improve engine performance over the whole range of engine speeds.
Recommended Content
Technical Paper | Development of a New Multi-Mode Variable Valve Timing Engine |
Technical Paper | Simulation and Evaluation of a Variable Valve Timing Single Cylinder Spark Ignition Engine |
Technical Paper | Turbocharged Spark Ignition Engine Simulation |
Authors
Topic
Citation
Hanipah, M., Rosli, M., and Razali, A., "Flexible valve timing strategies for boosting a small four-stroke spark ignition engine performance," SAE Technical Paper 2019-32-0591, 2020.Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Unnamed Dataset 2 | ||
Unnamed Dataset 3 | ||
Unnamed Dataset 4 | ||
Unnamed Dataset 5 |
Also In
References
- Ma , T.H. Effect of Variable Engine Valve Timing on Fuel Economy . 1988 SAE International.
- Lee , J. and H.-J. Chang Multi-parametric model predictive control for variable valve timing 2017 17th International Conference on Control, Automation and Systems ( ICCAS ) 2017 IEEE
- Turner , J. , S. Kenchington , and D. Stretch Production AVT development Lotus and Eaton’s electrohydraulic closed-loop fully variable valve train system 25th Vienna Motor Symposium, 2004 2004 University of Bath
- Halderman , J.D. and C.D. Mitchell Automotive technology 2014 Pearson
- Rosli , M.H.A. , M.R. Hanipah , and M. Kettner The tuning of a small four-stroke spark ignition engine for flexible valve timings through numerical approach. 2019 255 04004
- Zahidi , M.K. , et al. The two-stroke poppet valve engine. Part 1: Intake and exhaust ports flow experimental assessments . in IOP Conference Series : 2017 IOP Publishing
- Ismail , A.R. , R.A. Bakar , and Semin An Investigation of Valve Lift Effect on Air Flow and CD of Four Stroke Engines Based on Experiment American Journal of Applied Sciences 2008 5 8
- Hanipah , M.R. Development of a spark ignition free-piston engine generator , in School of Mechanical and Systems Engineering 2015 Newcastle University Newcastle upon Tyne, United Kingdom
- Hanipah , M.R. and R. Akhtar Razul The numerical assessment of motion strategies for integrated linear motor during starting of a free-piston engine generator IOP Conference Series: Materials Science and Engineering 2017 257 1 012054