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Research Papers

Control-Oriented Model of Atkinson Cycle Engine With Variable Intake Valve Actuation

[+] Author and Article Information
G. Murtaza

Department of Electrical Engineering,
Control and Signal Processing Research Group,
Capital University of Science & Technology,
Islamabad 44000, Pakistan
e-mail: gmurtazza@gmail.com

A. I. Bhatti

Department of Electrical Engineering,
Capital University of Science & Technology,
Islamabad 44000, Pakistan
e-mail: aib@cust.edu.com

Q. Ahmed

Center for Automotive Research,
The Ohio State University,
Columbus, OH 43212
e-mail: ahmed.358@osu.edu

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received July 26, 2015; final manuscript received January 28, 2016; published online March 17, 2016. Assoc. Editor: Ryozo Nagamune.

J. Dyn. Sys., Meas., Control 138(6), 061001 (Mar 17, 2016) (9 pages) Paper No: DS-15-1344; doi: 10.1115/1.4032746 History: Received July 26, 2015; Revised January 28, 2016

With the advancement in the innovated technologies, optimum efficiency of spark ignition (SI) engine can be accomplished during the entire engine operating range, particularly at part load. In this research, a novel control-oriented extended mean value engine model (EMVEM) of the Atkinson cycle engine is proposed, wherein the Atkinson cycle, variable valve timing (VVT), overexpansion, and variable compression ratio (VCR) characteristics are incorporated. For this purpose, an intake valve timing (IVT) parameter is introduced, which has a vital role in modeling the inclusive dynamics of the system and to deal with engine performance degrading aspects. The proposed model is validated with the experimental data of a VVT engine, obtained from literature, to ensure that the proposed model has the capability to capture the dynamics of the Atkinson cycle engine, and engine load can be controlled by IVT parameter, instead of the conventional throttle. The potential benefits of late intake valve closing (LIVC) tactic and copious integrated characteristics are appreciated as well. Furthermore, simulation results of the developed model primarily indicate the reduction in the engine part load losses and enhancement in thermal efficiency due to overexpansion, which has a great significance in the enhancement of the performance, fuel economy, and emissions reduction. Besides, the constraints on LIVC and overexpansion become evident.

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Figures

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Fig. 1

The PV diagram of an ideal Atkinson cycle engine [6]

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Fig. 2

Camshaft profiles used for LIVC strategy

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Fig. 3

Volumetric efficiency against speed at various dwelling angles

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Fig. 4

Comparison of the EMVEM simulation and experimental torques at different LIVC timings

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Fig. 5

Comparison of pumping losses versus brake mean effective pressure of the EMVEM and conventional model at 3000 rpm

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Fig. 6

Constraints on the IVT parameter of the EMVEM against load

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Fig. 7

Comparison of the thermal efficiencies of the proposed EMVEM and conventional Otto cycle MVEM as a function of load

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Fig. 8

Thermal efficiency of EMVEM versus IVT parameter for various values of CR

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