Improvement of engine performance using an adaptive valve lift and timing (AVLT) mechanism at high engine speeds

A. F. Abdul Rasid, T. I. Mohamad, Mariyam Jameelah Ghazali, Wan Mohd Faizal Wan Mahmood

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper explains about an improvement of high end performance using an adaptive valve lift and timing mechanism (AVLT). This system is developed with an aim to produce a more powerful engine through a variable valve timing technique. The preliminary design of this system adjusts the valve lift via control lever positioned by the rotation of an electric motor and has the potential to be actuated by a hydraulic cylinder that utilises engine fluids pressure difference with respect to the engine speed which made the valve lifts higher in higher engine speed and loads. The mechanism actuation is determined by a feedback signal of the engine electronic control unit that interacted in relation with the present engine speed and load. Therefore, a continuously dynamic valve lift profile with respect to the engine speed can be achieved thus varies the output performance of an engine. As a result of applying the AVLT on a simulated engine model with the actual parameters, the power and torque were increased in high engine speed (above 4000 rpm). The AVLT is able to increase the default valve lift by up to 35.96%. In high end speed of 7000 rpm, maximum lift of AVLT improved engine power by 4.26%, brake torque by 4.25% and reduced the brake specific fuel consumption by 1.14%. Maximum lift of AVLT increased the engine peak power at 6000 rpm by 2.38%. The product of this research will be useful to optimise the height of the valve lift during operation thus improves the engine performance, fuel economy and emission levels of spark ignition engine.

Original languageEnglish
Title of host publicationApplied Mechanics and Materials
PublisherTrans Tech Publications Ltd
Pages359-365
Number of pages7
Volume663
ISBN (Print)9783038352617
DOIs
Publication statusPublished - 2014
Event2nd International Conference on Recent Advances in Automotive Engineering and Mobility Research, ReCAR 2013 - Kuala Lumpur
Duration: 16 Dec 201318 Dec 2013

Publication series

NameApplied Mechanics and Materials
Volume663
ISSN (Print)16609336
ISSN (Electronic)16627482

Other

Other2nd International Conference on Recent Advances in Automotive Engineering and Mobility Research, ReCAR 2013
CityKuala Lumpur
Period16/12/1318/12/13

Fingerprint

Engines
Brakes
Torque
Electric motors
Fuel economy
Engine cylinders
Internal combustion engines
Fuel consumption
Hydraulics
Feedback
Fluids

Keywords

  • AVLT
  • BSFC
  • Engine Power
  • Engine Torque
  • High speed performance

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Abdul Rasid, A. F., Mohamad, T. I., Ghazali, M. J., & Wan Mahmood, W. M. F. (2014). Improvement of engine performance using an adaptive valve lift and timing (AVLT) mechanism at high engine speeds. In Applied Mechanics and Materials (Vol. 663, pp. 359-365). (Applied Mechanics and Materials; Vol. 663). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/AMM.663.359

Improvement of engine performance using an adaptive valve lift and timing (AVLT) mechanism at high engine speeds. / Abdul Rasid, A. F.; Mohamad, T. I.; Ghazali, Mariyam Jameelah; Wan Mahmood, Wan Mohd Faizal.

Applied Mechanics and Materials. Vol. 663 Trans Tech Publications Ltd, 2014. p. 359-365 (Applied Mechanics and Materials; Vol. 663).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abdul Rasid, AF, Mohamad, TI, Ghazali, MJ & Wan Mahmood, WMF 2014, Improvement of engine performance using an adaptive valve lift and timing (AVLT) mechanism at high engine speeds. in Applied Mechanics and Materials. vol. 663, Applied Mechanics and Materials, vol. 663, Trans Tech Publications Ltd, pp. 359-365, 2nd International Conference on Recent Advances in Automotive Engineering and Mobility Research, ReCAR 2013, Kuala Lumpur, 16/12/13. https://doi.org/10.4028/www.scientific.net/AMM.663.359
Abdul Rasid AF, Mohamad TI, Ghazali MJ, Wan Mahmood WMF. Improvement of engine performance using an adaptive valve lift and timing (AVLT) mechanism at high engine speeds. In Applied Mechanics and Materials. Vol. 663. Trans Tech Publications Ltd. 2014. p. 359-365. (Applied Mechanics and Materials). https://doi.org/10.4028/www.scientific.net/AMM.663.359
Abdul Rasid, A. F. ; Mohamad, T. I. ; Ghazali, Mariyam Jameelah ; Wan Mahmood, Wan Mohd Faizal. / Improvement of engine performance using an adaptive valve lift and timing (AVLT) mechanism at high engine speeds. Applied Mechanics and Materials. Vol. 663 Trans Tech Publications Ltd, 2014. pp. 359-365 (Applied Mechanics and Materials).
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