Research Papers

Dynamic Modeling of a Piezoelectric Actuated Fuel Injector

[+] Author and Article Information
Chris A. Satkoski

Gregory M. Shaver, Ranjit More, Peter Meckl, Douglas Memering, Shankar Venkataraman, Jalal Syed, Jesus Carmona-Valdes

Energy Center, Ray W. Herrick Laboratories,  School of Mechanical Engineering, Purdue University, 140 South Martin Jischke Drive, West Lafayette, IN 47906

J. Dyn. Sys., Meas., Control 133(5), 051011 (Aug 05, 2011) (8 pages) doi:10.1115/1.4003095 History: Received August 26, 2009; Revised May 25, 2010; Published August 05, 2011; Online August 05, 2011

As engine designers look for ways to improve efficiency and reduce emissions, piezoelectric actuated fuel injectors for common rail diesel engines have shown to have improved response characteristics over solenoid actuated injectors and may allow for enhanced control of combustion through multipulse, closely spaced injections or rate shaping. This paper outlines the development of an 11 state simulation model for a piezoelectric fuel injector and associated driver that can be used for injector design and control system verification. Nonmeasureable states of the model are plotted and analyzed, while measurable quantities including injection rate, piezo stack voltage, and piezo stack current are validated against experimental injector rig data for two different rail pressures.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Operating principle of a prototype piezoelectric fuel injector. (Note: specific design details suppressed due to confidentiality.)

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Figure 2

Injector free body diagrams

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Figure 3

Injector needle flow resistance

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Figure 4

Upper body free body diagrams

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Figure 5

Bosch type flow measurement rig

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Figure 6

Driver voltage input, Vin

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Figure 7

Comparison of injector flow rate

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Figure 8

Comparison of piezo stack voltage

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Figure 9

Comparison of iezo current

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Figure 10

Displacements of piezo stack and bottom link

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Figure 11

Needle lower volume pressure

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Figure 13

Needle upper volume pressure

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Figure 14

Body volume pressure



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