Research Papers: Internal Combustion Engines

Simulation Study of Advanced Variable Displacement Engine Coupled to Power-Split Hydraulic Hybrid Powertrain

[+] Author and Article Information
Fernando Tavares, Rajit Johri

Zoran Filipi1

Mechanical Engineering,  University of Michigan, Ann Arbor, MI 48109filipi@umich.edu


Corresponding author.

J. Eng. Gas Turbines Power 133(12), 122803 (Aug 31, 2011) (12 pages) doi:10.1115/1.4004073 History: Received May 04, 2010; Revised March 17, 2011; Published August 31, 2011

The simulation based investigation of the variable displacement engine is motivated by a desire to enable unthrottled operation at part load, and hence eliminate pumping losses. The mechanism modeled in this work is derived from a Hefley engine concept. Other salient features of the proposed engine are turbocharging and cylinder deactivation. The cylinder deactivation combined with variable displacement further expands the range of unthrottled operation, whereas turbocharging increases the power density of the engine and allows downsizing without the loss of performance. Although the proposed variable displacement turbocharged engine (VDTCE) concept enables operations in a very wide range, running near idle is impractical. Therefore, the VDTCE is integrated with a hybrid powertrain to mitigate issues with engine transients and mode transitions. The engine model is developed in AMESim using physics based models, such as thermodynamic cycle simulation, filling and emptying of manifolds, and turbulent flame entrainment combustion. A predictive model of the power-split hydraulic hybrid driveline is created in SIMULINK , thus facilitating integration with the engine. The integrated simulation tool is utilized to address design and control issues, before determining the fuel economy potential of the powertrain comprising a VDTCE engine and a hydraulic hybrid driveline.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Hefley Engine Concept [15]

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Figure 2

AMESim Model of the Variable Displacement Turbocharged Engine System

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Figure 3

Cylinder volume (cm3 ) history after a command change from “full” to “minimum”

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Figure 4

Waste gate control with feedforward and feedback

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Figure 5

Intake pressure build up from “zero” boost. Engine condition: 3000 rpm and 50% displacement.

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Figure 6

Knock intensity variation for boost pressure history shown in Fig. 5

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Figure 7

Intake manifold pressure map (bar)

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Figure 8

Fuel controller block diagram

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Figure 9

Cylinder deactivation–avgerage engine torque (Nm)

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Figure 10

Break specific fuel consumption map of the VDTC engine and best BSFC trajectory

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Figure 11

Modified power-split architecture with hydraulic components, and a lever diagram of the proposed PS-HHV system

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Figure 12

Engine power demand versus state-of-charge predicted over the FTP75 driving schedule

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Figure 13

Power-split HHV results over a segment of the FTP 75 driving schedule: vehicle and powertrain component speed histories (top), engine and wheel speed histories, SOC (middle), and pump and motor power histories (bottom)

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Figure 14

Powersplit vehicle engine operating points for an FTP75 driving cycle

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Figure 15

AMESim model of the 3.6 L V6 engine

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Figure 16

Operating points of a 3.6 l naturally aspirated engine in a conventional vehicle, simulated over an FTP75 driving cycle

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Figure 17

Conventional versus power-split results over a segment of the FTP 75 driving schedule: engine speed (top), engine torque (middle), and fuel consumption (bottom)

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Figure 18

Instantaneous engine efficiency over a segment of the FTP75 driving cycle

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Figure 19

Crankshaft diagram showing the input and output variables




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