Flatness-Based Tracking of an Electromechanical Variable Valve Timing Actuator With Disturbance Observer Feedforward Compensation

Chladny, R.R.; Koch, Charles Robert

doi:10.1109/tcst.2007.912121

Cited by 75 publications

(61 citation statements)

References 25 publications

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“…Mercorelli suggests a two-stage sliding-mode observer using Kalman filters to implement the sensorless control system of the electromagnetic engine valve [5][6][7]. Chlandy and Koch designed a closed-loop controller near the valve stroke bounds for the soft landing using a model which identifies combustion gas force variation [8]. Although they offered the highest flexibility in valve timing control, the solenoid-driven electromagnetic engine valve actuator suffers from an inherent problem of high-energy consumption for the operation of this system [4].…”

Section: Introductionmentioning

confidence: 99%

Genetic Algorithm-Based Design Optimization of Electromagnetic Valve Actuators in Combustion Engines

Lee

Han

et al. 2015

Energies

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Abstract:In this research, the design of a new electromagnetic engine valve in the limited space of combustion engine is optimized by multidisciplinary simulation using MATLAB and Maxwell. An electromagnetic engine valve actuator using a permanent magnet is a new actuator concept for overcoming the inherent drawbacks of the conventional solenoid-driven electromagnetic engine valve actuator, such as high power consumption and so on. This study aims to maximize the vibration frequency of the armature to reduce the transition time of the engine valve. The higher performance of the new actuator is demonstrated by dynamic finite element analysis.

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Section: Introductionmentioning

confidence: 99%

Genetic Algorithm-Based Design Optimization of Electromagnetic Valve Actuators in Combustion Engines

Lee

Han

et al. 2015

Energies

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“…A mass-spring-damper is use to represent the mechanical subsystem of the camless system as shown in figure 2 (b) [15]. The mass m [kg] in figure 2(b) is the combined masses of the armature and the valve.…”

Section: Camless Sub-systemsmentioning

confidence: 99%

Comparative Analysis Between <i>Cam</i> and <i>Cam-less</i> Valve Actuating for Automotive System

Kisabo¹

2017

EAS

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Abstract:A promising alternative of the conventional camshaft in internal combustion engines is one that replaces the camshaft with electromagnetic actuators. This so-called camless system provides great opportunities for the automotive industry. To investigate the advantage of the system against the cam system firstly, we modelled the lift profiles of both systems with novel mathematical expressions. For the camless system we modelled an Electromagnetic Valve Actuating (EMVA) system that captures a plant transfer function and a PID controller with a set-point tracking scheme. Simulation result in MATLAB/Simulink of the theoretical camless lift profile was imported into Curve Fitting (CF) Toolbox of MATLAB and the novel mathematical model was realized. Experimentally measured data for the camless lift profile were then fitted with this model and a tuned experimental model was realized. While for the cam system, the mathematical model was developed directly from experimental data via Curve Fitting Toolbox of MATLAB. Secondly, we computed volumetric efficiencies of both systems using the novel mathematical lift profiles at different engine speeds. The camless system was observed to outperform the cam system.

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“…This situation could be more severe in the presence of a high gas force, as will occur with an exhaust valve. In recent literature, soft landing has been first achieved by a complicated nonlinear control scheme without considering gas force [11], and most recently improved algorithms have been reported which show better performance in terms of soft valve landing even in the presence of combustion forces [14] [15].…”

Section: Background and Motivationmentioning

confidence: 99%

“…The fundamental contribution of the proposed EMV system is the capability of inherent soft landings at the ends of transitions and zero power consumption between valve transitions owing to a deliberately nonlinear mechanical transformer (NMT). Conceptual feasibility has been demonstrated previously [14] [15]. However, to demonstrate the practicality of the proposed system for real engines, several significant technical barriers need to be overcome, including lowering power consumption, reducing actuator size, and providing transition times fast enough for engine speed over 6000 rpm.…”

Section: Introductionmentioning

confidence: 96%

Nonlinear System Modeling, Optimal Cam Design, and Advanced System Control for an Electromechanical Engine Valve Drive

Qiu

Perreault

Keim

et al. 2012

IEEE/ASME Trans. Mechatron.

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Abstract-A cam-based, shear force actuated electromechanical valve drive system offering variable valve timing in internal combustion engines was previously proposed and demonstrated. To transform this concept into a competitive commercial product, several major challenges need to addressed, including the reduction of power consumption, transition time, and size. As shown in this paper, by using nonlinear system modeling, optimizing cam design, and exploring different control strategies, the power consumption has been reduced from 140 W to 49 W (65%), the transition time has been decreased from 3.3 ms to 2.7 ms (18%), and the actuator torque requirement has been cut from 1.33 N-m to 0.30 N-m (77%).Index Terms-Open-loop control, optimal cam design, nonlinear friction model, variable valve timing.

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Flatness-Based Tracking of an Electromechanical Variable Valve Timing Actuator With Disturbance Observer Feedforward Compensation

Cited by 75 publications

References 25 publications

Genetic Algorithm-Based Design Optimization of Electromagnetic Valve Actuators in Combustion Engines

Genetic Algorithm-Based Design Optimization of Electromagnetic Valve Actuators in Combustion Engines

Comparative Analysis Between <i>Cam</i> and <i>Cam-less</i> Valve Actuating for Automotive System

Nonlinear System Modeling, Optimal Cam Design, and Advanced System Control for an Electromechanical Engine Valve Drive

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Flatness-Based Tracking of an Electromechanical Variable Valve Timing Actuator With Disturbance Observer Feedforward Compensation

Cited by 75 publications

References 25 publications

Genetic Algorithm-Based Design Optimization of Electromagnetic Valve Actuators in Combustion Engines

Genetic Algorithm-Based Design Optimization of Electromagnetic Valve Actuators in Combustion Engines

Comparative Analysis Between &lt;i&gt;Cam&lt;/i&gt; and &lt;i&gt;Cam-less&lt;/i&gt; Valve Actuating for Automotive System

Nonlinear System Modeling, Optimal Cam Design, and Advanced System Control for an Electromechanical Engine Valve Drive

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Product

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Comparative Analysis Between <i>Cam</i> and <i>Cam-less</i> Valve Actuating for Automotive System