Implementation and Analysis of a Repetitive Controller for an Electro-Hydraulic Engine Valve System

Variable valve actuation plays an important role in modern engine design. Fuel economy, emissions, and power output can be improved through appropriately varying valve lift and timing. One means of independently and continuously adjusting these valve profile parameters is with an electro-hydraulic v...

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Bibliographic Details
Published in:IEEE transactions on control systems technology 2011-09, Vol.19 (5), p.1102-1113
Main Authors: Liao, H., Roelle, M. J., Jyh-Shin Chen, Sungbae Park, Gerdes, J. C.
Format: Article
Language:English
Subjects:
Actuators
Adaptive control
Applied sciences
Computer science
control theory
systems
Control system analysis
Control systems
Control theory. Systems
Controllers
Drives
Dynamical systems
Electro-hydraulic system
Electrohydraulics
Engines and turbines
Exact sciences and technology
Feedback
Internal combustion engines
Internal combustion engines: gazoline engine, diesel engines, etc
linear quadratic tracking controller
Mathematical models
Mechanical engineering. Machine design
Modelling and identification
Nonlinear dynamics
repetitive control
Speed variators, torque converters. Hydraulic drives and controls, pneumatic drives and controls, fluids and components, hydraulic motors, pneumatic motors
Studies
System identification
time-delayed system
Tracking errors
Valves
variable valve actuation (VVA) system
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Summary:Variable valve actuation plays an important role in modern engine design. Fuel economy, emissions, and power output can be improved through appropriately varying valve lift and timing. One means of independently and continuously adjusting these valve profile parameters is with an electro-hydraulic valve system (EHVS). However, with an EHVS, it is very difficult to achieve the same level of accurate position control that a mechanical cam provides. In particular, the response time delay and the nonlinear dynamics of the hydraulic system can lead to error in valve position control. The paper first describes the identification method used to obtain a mathematical model of the EHVS. Based on the model, two linear feedback controllers are developed and compared. To further improve the tracking performance, a repetitive feed-forward controller is added to augment the feedback controller and the root mean square tracking error is improved to under 40 μ m. Stability and steady-state tracking error variance analyses complete the mathematical framework of this work.
ISSN:1063-6536
1558-0865
DOI:10.1109/TCST.2010.2076387