Modeling of piston trajectory-based HCCI combustion enabled by a free piston engine

Zhang, Chen; Li, Ké; Sun, Zongxuan

doi:10.1016/j.apenergy.2014.11.007

Cited by 63 publications

(40 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1). The effectiveness of this method is demonstrated by the simulation of a comprehensive physicalbased model with detailed reaction mechanisms of the utilized fuel [10].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A control-oriented model for piston trajectory-based HCCI combustion

Zhang

Sun

2015

2015 American Control Conference (ACC)

Self Cite

View full text Add to dashboard Cite

previously, the authors have proposed the concept of piston trajectory-based homogeneous charge compression ignition (HCCI) combustion control enabled by a free piston engine and shown the effects of variable piston trajectories on the start of combustion timing, heat loss amount and indicated output work. In order to realize this new control in practical applications, a control-oriented model with reduced chemical kinetics has to be developed. In this paper, such a model is presented and is compared to two existing models: a simplified model using a global reaction and a complex model including detailed chemical reaction mechanisms. A cycle separation method is employed in the proposed model to significantly reduce the computational time and guarantee the prediction accuracy simultaneously. A feedback controller is also implemented on the control-oriented model to control the HCCI combustion phasing by varying the trajectories. The simulation results show that the combustion phasing can be adjusted as desired, which demonstrates the effectiveness of the piston trajectory-based combustion control.

show abstract

“…1). The effectiveness of this method is demonstrated by the simulation of a comprehensive physicalbased model with detailed reaction mechanisms of the utilized fuel [10].…”

Section: Introductionmentioning

confidence: 99%

“…Previously, a novel control method named trajectorybased combustion control, was proposed by the authors [10]. This method is enabled by free piston engines (FPE), Chen whose piston motion is not constrained by the crankshaft mechanism [11,12].…”

Section: Introductionmentioning

confidence: 99%

A control-oriented model for piston trajectory-based HCCI combustion

Zhang

Sun

2015

2015 American Control Conference (ACC)

Self Cite

View full text Add to dashboard Cite

show abstract

“…On the other hand, the operation of the intake and exhaust valves are highly dependent on the pre-judgement of the piston motion states such as the displacement, velocity and acceleration. Moreover, the piston motion states have significant effects on the system performances like the power and efficiency [13,25].…”

Section: Motion States Monitoringmentioning

confidence: 99%

“…The configurations of the FPLG prototypes can be generally classified into single-cylinder, dual-piston and the opposed-piston types [4], which have been widely studied by many groups worldwide [6][7][8][9][10][11][12][13]. The development status of these prototypes indicates that the single-cylinder FPLG has advantages of a simple structure and easy system control, and thereby is intensively studied [14,15].…”

Section: Introductionmentioning

confidence: 99%

Hybrid System Modeling and Full Cycle Operation Analysis of a Two-Stroke Free-Piston Linear Generator

et al. 2017

View full text Add to dashboard Cite

Free-piston linear generators (FPLGs) have attractive application prospects for hybrid electric vehicles (HEVs) owing to their high-efficiency, low-emissions and multi-fuel flexibility. In order to achieve long-term stable operation, the hybrid system design and full-cycle operation strategy are essential factors that should be considered. A 25 kW FPLG consisting of an internal combustion engine (ICE), a linear electric machine (LEM) and a gas spring (GS) is designed. To improve the power density and generating efficiency, the LEM is assembled with two modular flat-type double-sided PM LEM units, which sandwich a common moving-magnet plate supported by a middle keel beam and bilateral slide guide rails to enhance the stiffness of the moving plate. For the convenience of operation processes analysis, the coupling hybrid system is modeled mathematically and a full cycle simulation model is established. Top-level systemic control strategies including the starting, stable operating, fault recovering and stopping strategies are analyzed and discussed. The analysis results validate that the system can run stably and robustly with the proposed full cycle operation strategy. The effective electric output power can reach 26.36 kW with an overall system efficiency of 36.32%.

show abstract

“…The first one is trajectory tracking control, which means the piston motion is controlled to follow along with a specified reference trajectory [12][13][14][15][16][17]. The second one is specifying a reference current profile to generate an appropriate electromagnetic force for stable operation [5,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A Free-Piston Linear Generator Control Strategy for Improving Output Power

Zhang

Chen

et al. 2018

Energies

View full text Add to dashboard Cite

This paper presents a control strategy to improve the output power for a single-cylinder two-stroke free-piston linear generator (FPLG). The comprehensive simulation model of this FPLG is established and the operation principle is introduced. The factors that affect the output power are analyzed theoretically. The characteristics of the piston motion are studied. Considering the different features of the piston motion respectively in acceleration and deceleration phases, a ladder-like electromagnetic force control strategy is proposed. According to the status of the linear electric machine, the reference profile of the electromagnetic force is divided into four ladder-like stages during one motion cycle. The piston motions, especially the dead center errors, are controlled by regulating the profile of the electromagnetic force. The feasibility and advantage of the proposed control strategy are verified through comparison analyses with two conventional control strategies via MatLab/Simulink. The results state that the proposed control strategy can improve the output power by around 7-10% with the same fuel cycle mass.

show abstract

Modeling of piston trajectory-based HCCI combustion enabled by a free piston engine

Cited by 63 publications

References 36 publications

A control-oriented model for piston trajectory-based HCCI combustion

A control-oriented model for piston trajectory-based HCCI combustion

Hybrid System Modeling and Full Cycle Operation Analysis of a Two-Stroke Free-Piston Linear Generator

A Free-Piston Linear Generator Control Strategy for Improving Output Power

Contact Info

Product

Resources

About