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Research Papers

Modeling the Vacuum Circuit of a Pneumatic Valve System

[+] Author and Article Information
J. Galindo

CMT-Motores Térmicos, Universidad Politécnica de Valencia, Camino de Vera s/n., 46022 Valencia, Spaingalindo@mot.upv.es

H. Climent, C. Guardiola, J. Doménech

CMT-Motores Térmicos, Universidad Politécnica de Valencia, Camino de Vera s/n., 46022 Valencia, Spain

J. Dyn. Sys., Meas., Control 131(3), 031011 (Mar 23, 2009) (11 pages) doi:10.1115/1.3089562 History: Received September 22, 2005; Revised September 25, 2008; Published March 23, 2009

The aim of this article is to present the theoretical and experimental work related to the vacuum system used for controlling the actuation of pneumatic valves in internal combustion engines in order to obtain a physical model of this system. In this context, these valves control the turbocharger operation in a two-stage sequential turbocharged diesel engine. With the purpose of providing the model with information, several characterization tests of the elements that integrate the vacuum system were performed. Related to the theoretical contents, two models of the vacuum system were developed and compared, either by using a 1D or a 0D approach. Within the experimental section the obtained instantaneous pressure in the actuator chamber of four air valves and two storage reservoirs of the circuit are measured and compared with the modeling results. Since the simulations show good agreement when comparing the instantaneous pressure evolutions and valve movement with the experimental data, the model can be used to predict the behavior of the vacuum system. Finally, the model is used to optimize the transient turbocharger sequential operation under real engine running conditions. The simulation results predict with accuracy the measurements acquired in an engine test bench. Therefore a consistent methodology has been established in order to reproduce the vacuum system behavior and can be used as a designing tool for complex applications devoted to engine controlling tasks.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

System layout and valve configuration for the two main operative modes (top: 1T; bottom: 2T) in a parallel sequential turbocharged engine

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Figure 2

Schematic layout of a vacuum system controlling four valves

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Figure 3

Experimental characterization test of the vacuum pump

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Figure 4

Vacuum pump characterization test results

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Figure 5

Experimental characterization test of the duct restriction

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Figure 6

Duct restriction characterization test results

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Figure 7

Air valve actuator subsystem schematic

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Figure 8

Experimental characterization test of the air valve

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Figure 9

Air valve characterization test results

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Figure 10

Structure of the electropneumatic pressure converter

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Figure 11

Experimental characterization test of the EPC

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Figure 12

Magnetic force determination in the EPC

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Figure 13

Two physical models of the vacuum system: 1D (left) and 0D (right)

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Figure 14

Adjusted effective sections depending on the core position

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Figure 15

Validation of the discharge coefficients of the EPC

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Figure 16

Comparison of two physical models of the vacuum system

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Figure 17

Comparison of modeled and measured results for the actuator chamber pressure

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Figure 18

Experimental and modeled results of the vacuum system

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Figure 19

Actuator chambers and storage reservoir instantaneous pressure and valve position time evolutions during engine operation (dotted lines: measured; solid lines: calculated)

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Figure 20

Engine performance during a transition with different AV No. 1 synchronization timings (dotted line: early closing; solid line: correct closing)

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