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Research Papers

Modeling and Control of an Electric Variable Valve Timing System

[+] Author and Article Information
Zhen Ren

Mem. ASME
Mechanical Engineering,
Michigan State University,
East Lansing, MI 48824
e-mail: renzhen@msu.edu and
zhen.ren@delphi.com

Guoming G. Zhu

Fellow ASME
Department of Mechanical Engineering,
Department of Electrical and
Computer Engineering, break/>Michigan State University,
1497 Engineering Research Court,
Room E148,
East Lansing, MI 48824
e-mail: zhug@egr.msu.edu

1Present address: Delphi Powertrain Systems, Auburn Hills, MI 48326.

2Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received September 10, 2012; final manuscript received October 24, 2013; published online December 16, 2013. Assoc. Editor: Xubin Song.

J. Dyn. Sys., Meas., Control 136(2), 021015 (Dec 16, 2013) (11 pages) Paper No: DS-12-1297; doi: 10.1115/1.4025914 History: Received September 10, 2012; Revised October 24, 2013

This paper presents a model of an electric variable valve timing (EVVT) system and its closed-loop control design with experimental validation. The studied EVVT uses a planetary gear system to control the engine cam timing. The main motivation of utilizing the EVVT system is its fast response time and the accurate timing control capability. This is critical for the combustion mode transition control between the spark ignition (SI) and homogeneous charge compression ignition (HCCI) combustion, where the engine cam timing needs to follow a desired trajectory to accurately control the engine charge and recompression process. A physics-based model was developed to study the characteristics of the EVVT system, and a control oriented EVVT model, with the same structure as the physics-based one, was obtained using closed-loop system identification. The closed-loop control strategies were developed to control the EVVT to follow a desired trajectory. Both simulation and bench test results are included.

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Figures

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Fig. 1

Electric planetary gear VVT system

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Fig. 2

Free body diagrams of planetary gear components

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Fig. 3

Block diagram of an electric motor with the planetary gear system

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Fig. 4

EVVT control system architecture

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Fig. 5

Torque load for single cylinder

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Fig. 6

Simulated cam phase responses at 1500 rpm

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Fig. 7

Cam phase output comparison at 2000 rpm

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Fig. 8

EVVT system test bench diagram

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Fig. 10

Closed-loop identification framework

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Fig. 11

EVVT bench step response comparison

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Fig. 12

EVVT phase tracking comparison

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Fig. 13

Sinusoidal responses of the closed-loop EVVT system at 0.01 and 1.00 Hz

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Fig. 14

Measured and identified EVVT frequency responses at 1000 rpm

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Fig. 15

Impact of engine oil viscosity on EVVT response

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