Research Papers

First Principle Based Control Oriented Gasoline Engine Model Including Lumped Cylinder Dynamics

[+] Author and Article Information
Ahmed Yar

Department of Electrical Engineering,
Capital University of Science & Technology,
Islamabad 44000, Pakistan
e-mails: ahmedyar@gmail.com;

A. I. Bhatti

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

Qadeer Ahmed

Center for Automotive Research,
The Ohio State University,
Columbus, OH 43210
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 May 9, 2017; final manuscript received January 12, 2018; published online March 13, 2018. Assoc. Editor: Beshah Ayalew.

J. Dyn. Sys., Meas., Control 140(8), 081011 (Mar 13, 2018) (7 pages) Paper No: DS-17-1244; doi: 10.1115/1.4039195 History: Received May 09, 2017; Revised January 12, 2018

A novel first principle based control oriented model of a gasoline engine is proposed which also carries diagnostic capabilities. Unlike existing control oriented models, the formulated model reflects dynamics of the faultless as well as faulty engine with high fidelity. In the proposed model, the torque production subsystem is obtained by integration of further two subsystems that is model of a single cylinder torque producing mechanism and an analytical gasoline engine cylinder pressure model. Model of a single cylinder torque producing mechanism is derived using constrained equation of motion (EOM) in Lagrangian mechanics. While cylinder pressure is evaluated using a closed form parametric analytical gasoline engine cylinder pressure model. Novel attributes of the proposed model include minimal usage of empirical relations and relatively wider region of model validity. Additionally, the model provides model based description of crankshaft angular speed fluctuations and tension in the rigid bodies. Capacity of the model to describe the system dynamics under fault conditions is elaborated with case study of an intermittent misfire condition. Model attains new capabilities based on the said novel attributes. The model is successfully validated against experimental data.

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Fig. 1

Structure of the proposed engine model

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Fig. 2

Mechanism producing the torque

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Fig. 3

Cylinder pressure model inputs and outputs

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Fig. 4

Piston free body diagram

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Fig. 5

Structure of brake torque evaluation in conventional control oriented engine models

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Fig. 6

Architecture of the torque production system

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Fig. 8

Intake manifold pressure

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Fig. 9

Crankshaft angular speed

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Fig. 10

Model response for the second dataset: (a) input throttle and (b) crankshaft angular speed (solid line is model output, while engine output is shown as dashed line)

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Fig. 11

Engine model outputs: (a) crankshaft angular position: (A) SOC and (B) top dead center; (b) crankshaft angular speed; (c) piston position; and (d) translational tension in connecting rod

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Fig. 12

Simulated pattern of crankshaft angular speed fluctuation (intermittent misfire condition)




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