A new practical feed-forward cascade analyze for close loop identification of combustion control loop system through RANFIS and NARX

2018 ◽  
Vol 133 ◽  
pp. 381-395 ◽  
Author(s):  
Ehsan Aghadavoodi ◽  
Ghazanfar Shahgholian
Keyword(s):  
Loop System ◽  
Combustion Control ◽  
Control Loop ◽  
Feed Forward

Heat Release Experimental Analysis for RCCI Combustion Optimization

2018 ◽  
Author(s):  
V. Ravaglioli ◽  
F. Ponti ◽  
F. Carra ◽  
M. De Cesare
Keyword(s):  
Low Temperature ◽  
Experimental Analysis ◽  
Closed Loop ◽  
Combustion Stability ◽  
Closed Loop Control ◽  
Combustion Control ◽  
Transient Conditions ◽  
Feed Forward ◽  
Loop Control ◽  
Injection Parameters

Over the past years, the increasingly stringent emission regulations for Internal Combustion Engines (ICE) spawned a great amount of research in the field of combustion control optimization. Nowadays, optimal combustion control has become crucial, especially to properly manage innovative Low Temperature Combustion (LTC) strategies, usually characterized by high instability, cycle-to-cycle variability and sensitivity to slight variations of injection parameters and thermal conditions. Many works demonstrate that stability and maximum efficiency of LTC strategies can be guaranteed using closed-loop control strategies that vary the standard injection parameters (mapped during the base calibration activity) to keep engine torque and center of combustion (CA50) approximately equal to their target values. However, the combination of standard base calibration and closed-loop control is usually not sufficient to accurately control Low Temperature Combustions in transient conditions. As a matter of fact, to properly manage LTC strategies in transient conditions it is usually necessary to investigate the combustion methodology of interest and implement specific functions that provide an accurate feed-forward contribution to the closed-loop controller. This work presents the experimental analysis performed running a light-duty compression ignited engine in dual-fuel RCCI mode, the goal being to highlight the way injection parameters and charge temperature affect combustion stability and ignition delay. Finally, the paper describes how the obtained results can be used to define the optimal injections strategy in the analyzed operating points, i.e. the combination of injection parameters to be used as a feed-forward for a closed-loop combustion control strategy.

scholarly journals Pso-based Mppt Technique Applied To A Grid-tied Pv System With Active Power Line Conditioning Using A Feed-forward Dc-bus Control Loop

2016 ◽  
Vol 21 (2) ◽  
pp. 105-116
Author(s):  
Sergio Silva ◽  
Leonardo Sampaio ◽  
Fernando Oliveira ◽  
Fábio Durand
Keyword(s):  
Power Line ◽  
Active Power ◽  
Control Loop ◽  
Pv System ◽  
Feed Forward ◽  
Dc Bus

Feed‐forward DC‐bus control loop applied to a single‐phase grid‐connected PV system operating with PSO‐based MPPT technique and active power‐line conditioning

2016 ◽  
Vol 11 (1) ◽  
pp. 183-193 ◽  
Author(s):  
Sérgio Augusto OLiveira da Silva ◽  
Leonardo Poltronieri Sampaio ◽  
Fernando Marcos de Oliveira ◽  
Fábio Renan Durand
Keyword(s):  
Single Phase ◽  
Power Line ◽  
Active Power ◽  
Control Loop ◽  
Pv System ◽  
Feed Forward ◽  
Dc Bus ◽  
System Operating

Series Analysis of a Closed-Loop System Containing a Loaded Hydraulic Relay

1964 ◽  
Vol 179 (1) ◽  
pp. 847-855 ◽  
Author(s):  
A. E. Cook ◽  
H. S. Heaps
Keyword(s):  
Linear System ◽  
Infinite Series ◽  
Closed Loop ◽  
Loop System ◽  
Error Signal ◽  
Closed Loop System ◽  
Velocity Feedback ◽  
Feed Forward ◽  
Signal Velocity ◽  
Forcing Function

Analysis is made of a closed-loop system that contains a hydraulic relay. It is shown that the ramp response of a system with an error signal, velocity feed-forward, and velocity feedback, may be expressed as a rapidly convergent infinite series whose terms may each be determined as the response of a linear system in the presence of a forcing function. Inclusion of a small number of terms in the series is sufficient to provide excellent prediction of the error signal. Similar analysis and results are presented for the system subject to a Coulomb load.

Optimal Linear-Quadratic Integral Feedback Controller Design With Disturbance Rejection for Proton Exchange Membrane Fuel Cell

2018 ◽  
Author(s):  
Milos Milanovic ◽  
Verica Radisavljevic-Gajic
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Controller Design ◽  
Proton Exchange ◽  
Control Loop ◽  
Feed Forward ◽  
Feed Forward Control ◽  
Augmented System ◽  
Exchange Membrane ◽  
The Impact

This paper presents, a novel controller design technique that can be used for the Proton Exchange Membrane Fuel Cell to tackle the impact of the sudden stack current disturbances. The proposed controller design consists of three components: a full-state feedback control loop, an integral of error control loop and a feed-forward control loop. The feed-forward control loop is designed to ease the impact of the piecewise continuous current disturbance on the stack voltage. Linearized system matrices are set up in such a way that a new augmented system is formed. Controller gains are calculated by using a quadratic performance criterion which is minimized along the trajectories of the augmented system. Simulation results are presented and discussed.

Dynamic Performance Improvement of a Grid-Tied PV System Using a Feed-Forward Control Loop Acting on the NPC Inverter Currents

2017 ◽  
Vol 64 (3) ◽  
pp. 2092-2101 ◽  
Author(s):  
Leonardo Bruno Garcia Campanhol ◽  
Sergio Augusto Oliveira da Silva ◽  
Azauri Albano de Oliveira ◽  
Vinicius Dario Bacon
Keyword(s):  
Performance Improvement ◽  
Dynamic Performance ◽  
Control Loop ◽  
Pv System ◽  
Feed Forward ◽  
Feed Forward Control

The effect of zinc orthophosphate and pH-alkalinity adjustment on metal levels leached into drinking water

2000 ◽  
Vol 27 (1) ◽  
pp. 33-43 ◽  
Author(s):  
D M Churchill ◽  
D S Mavinic ◽  
D G Neden ◽  
D M MacQuarrie
Keyword(s):  
Drinking Water ◽  
Treatment Options ◽  
Loop System ◽  
Metal Leaching ◽  
Control Loop ◽  
Free Standing ◽  
Standing Time ◽  
Copper And Zinc ◽  
Metal Levels ◽  
Zinc Levels

A 12-month pilot plant study was conducted to evaluate a number of corrosion control treatments to reduce metal leaching from typical household plumbing materials. A pipe loop system was used to test six treatment options, with a control loop of the characteristically soft, acidic, Greater Vancouver Water District (GVWD) water. Four pH- alkalinity combinations and two concentrations of zinc orthophosphate (0.37 mg/L and 1.0 mg/L as Zn) were studied. at regular intervals, the flowing, treated, and control waters were allowed to stagnate in the pipe loop system for 8- and 16-h periods. Following the designated standing time, water samples taken from the lead/tin solder jointed, soft copper plumbing coils, the submerged, free standing coils of 50/50 lead/tin solder, and the brass faucets, were measured for lead, copper, and zinc levels. Overall, when compared to the control loop, the pH-alkalinity treatments appeared to exacerbate metal leaching in standing samples. The zinc orthophosphate treated loops were both effective at reducing lead and copper leaching to below control levels. In general, the two standing times showed little difference in the levels of leached metals. The exception to this occurred in the higher dose zinc orthophosphate loop, which had higher copper and zinc levels at the longer standing time. Key words: copper, corrosion, drinking water, lead, zinc orthophosphate.

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