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research-article

Design, Development and Evaluation of a Control Framework for an Atkinson Cycle Engine

[+] Author and Article Information
Ghulam Murtaza

Visiting Scholar, Center for Automotive Research, The Ohio State University, Columbus, OH 43212, USA
gmurtazza@gmail.com

Aamer Iqbal Bhatti

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

Qadeer Ahmed

Center for Automotive Research, The Ohio State University, Columbus, OH 43212, USA
ahmed.358@osu.edu

1Corresponding author.

ASME doi:10.1115/1.4038299 History: Received December 20, 2016; Revised October 21, 2017

Abstract

The efficiency of the spark ignition (SI) engine degrades while working at part loads. It can be optimally dealt with a slightly different thermodynamic cycle termed as an Atkinson cycle. It can be implemented in the conventional SI engines by incorporating advanced mechanisms as variable valve timing (VVT) and variable compression ratio (VCR). In this research, a control framework for the Atkinson cycle engine with flexible intake valve load control strategy is designed and developed. The control framework based on extended mean value engine model (EMVEM) of the Atkinson cycle engine is evaluated in the view of fuel economy for the standard NEDC, FUDS and FHDS driving cycles. In this context, the authors have already proposed a controloriented EMVEM model of the Atkinson cycle engine with variable intake valve actuation. To demonstrate, the potential benefits of the VCR Atkinson cycle VVT engine, for the various driving cycles, in the presence of auxiliary loads and uncertain road loads, its EMVEM model is simulated by using a precisely tuned controller having similar specifications as that of the conventional gasoline engine. The simulation results point towards the significant reduction in engine part load losses and improvement in the thermal efficiency over the wide operating range. Consequently, considerable enhancement in the fuel economy of the VCR Atkinson cycle VVT engine is achieved over conventional Otto cycle engine during the NEDC, FUDS and FHDS driving cycles.

Copyright (c) 2017 by ASME
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