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Research Papers

Integrated System ID and Control Design for an IC Engine Variable Valve Timing System

[+] Author and Article Information
Zhen Ren

Department of Mechanical Engineering, Michigan State University, MI 48824renzhen@msu.edu

Guoming G. Zhu

Department of Mechanical Engineering, Michigan State University, MI 48824zhug@egr.msu.edu

J. Dyn. Sys., Meas., Control 133(2), 021012 (Mar 09, 2011) (10 pages) doi:10.1115/1.4003263 History: Received April 16, 2010; Revised August 11, 2010; Published March 09, 2011; Online March 09, 2011

This paper applies integrated system modeling and control design process to a continuously variable valve timing (VVT) actuator system that has different control input and cam position feedback sample rates. Due to high cam shaft torque disturbance and high actuator open-loop gain, it is also difficult to maintain the cam phase at the desired constant level with an open-loop controller for system identification. As a result, multirate closed-loop system identification becomes necessary. For this study, a multirate closed-loop system identification method, pseudo-random binary signal q-Markov Cover, was used for obtaining linearized system models of the nonlinear physical system at different engine operational conditions; and output covariance constraint (OCC) controller, an H2 controller, was designed based upon the identified nominal model and evaluated on the VVT test bench. Performance of the designed OCC controller was compared with that of the well-tuned baseline proportional-integral (PI) controller on the test bench. Results show that the OCC controller uses less control effort and has significant lower overshoot than those of PI ones.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Closed-loop identification framework

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Figure 2

VVT phase actuator test bench

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Figure 3

VVT system diagram

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Figure 4

Cam phase actuator open-loop step response

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Figure 5

Cam phase actuator open-loop steady-state responses

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Identified and physical responses

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Identified model order selection

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Bode diagram of open-loop plant at 1500 rpm

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Figure 9

Root locus of the identified fourth order plant at 1000 rpm

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Figure 10

Bode diagram of open-loop plant at 1000 rpm

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Figure 11

Closed-loop step response comparison at 1000 rpm

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Closed-loop step response comparison at 1500 rpm

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Figure 13

Family of identified models

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Step response for OCC controllers

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OCC design framework with an integrator

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Multi-input OCC design framework

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Step response comparison

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Figure 18

Control effort comparison at 900 rpm with 45 psi oil pressure

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