Resonant Combustion Start Considering Potential Energy of Free-Piston Engine Generator

Sato, Masaru; Goto, Takumi; Zheng, Jianming; Irie, Shoma

doi:10.3390/en13215754

Cited by 7 publications

(4 citation statements)

References 38 publications

(59 reference statements)

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“…Powering converts electrical power in a short period of time, so electrical loss increases more than when operating only by regeneration. Therefore, FPEG should reduce power running as much as possible and operate with regeneration only [25,26]. The switching of the Pulse-width-modulation inverter adjusts the current value of the coil, allowing the braking thrust of the linear generator to be controlled [27].…”

Section: B Energy Flowmentioning

confidence: 99%

Operation Range of Intermittent Velocity Control for Improving Top-Dead-Center Accuracy in Dual-Sided Free-Piston Engine Linear Generator

Sato,

Irie,

Mizuno

et al. 2023

IEEE Access

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A free-piston engine linear generator (FPEG) is constructed by combining a reciprocating internal combustion engine and a linear generator. FPEG is required to improve both the accuracy of the top-dead-center (TDC) positioning considering frequent combustion fluctuations and the reduction of power consumption. This paper confirms the influence of intermittent velocity control on power running suppression and TDC position deviation in a dual-cylinder FPEG. Intermittent velocity control is a simple method, which consists of repeatedly turning the speed control on and off. The experimental results of the glow engine indicate that this control suppresses power consumption and enables continuous combustion. The setting range for intermittent speed control, which continues operation only through regenerative operation, must be determined by considering the gain value. In addition, this paper explains the effects of the control range of intermittent velocity control on power generation efficiency, piston motion frequency, and TDC position deviation in the dual-cylinder FPEG. Increasing the range ratio of intermittent speed control improves power generation efficiency, but it also increases the standard deviation of TDC position.INDEX TERMS Free-piston engine, linear generator, generation control, speed control, and top-deadcenter

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Section: B Energy Flowmentioning

confidence: 99%

Operation Range of Intermittent Velocity Control for Improving Top-Dead-Center Accuracy in Dual-Sided Free-Piston Engine Linear Generator

Sato,

Irie,

Mizuno

et al. 2023

IEEE Access

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“…Energy flow is determined by solving the block diagram of Figure 3, which links three software. The mover action is obtained by solving Equation (1) using MATLAB-Simulink (The MathWorks, Inc., Natick, MA, USA), which contains the speci fications of the linear generator designed by JMAG-Designer (JSOL Corporation, Tokyo, Japan) and vector control [15,24]. The combustion thrust, considering the engine loss, is simulated using GT-SUITE (Gamma Technologies, LLC, Westmont, IL, USA).…”

Section: Energy Flow Of Fpegmentioning

confidence: 99%

“…FPEG is a power generation system without the crank mechanism, meaning the piston of the engine and the mover of the linear generator are connected. The operation of the piston (movable element) is adjusted using a power generation control with the inverter [23,24]. Setting the proper mover motion improves the thermal efficiency of the engine and the power generation efficiency of the linear generator.…”

Section: Introductionmentioning

confidence: 99%

Generator Design Considering Mover Action to Improve Energy Conversion Efficiency in a Free-Piston Engine Generator

et al. 2021

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In a free-piston engine generator (FPEG), the power of the engine can be directly regenerated by linear generators without a crank. The mover motion of this system is interrelated with engine and power generation efficiencies due to the direct connection between the mover of the generator and the piston of the engine. The generator should be designed to improve the overall energy conversion efficiency. The dimensions and mass of the mover limit its operating stroke and drive frequency. Herein, we propose a method for designing linear generators and constructing FPEG systems, considering the mover operation to improve engine efficiency. We evaluated the effect of mover operation on the engine and generation efficiencies using thermal and electromagnetic field analysis software. The proposed design method improves the overall energy conversion efficiency compared with a generator that considers only the maximization of generation efficiency. Setting the mover operation for higher engine efficiency and designing a linear generator to realize the operation can effectively improve the energy conversion efficiency of FPEGs.

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“…The reciprocating motion of the piston, driven by the power of the internal combustion engine, creates electricity for FPEGs [7]. In FPEGs without a crank mechanism, the piston motion can be changed.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nonlinear Spring Characteristics on the Efficiency of Free-Piston Engine Generator

et al. 2022

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Piston motion is an important factor in improving the energy conversion efficiency of free-piston engine generators (FPEGs), and an air cylinder is an important component affecting piston motion. In this study, the effect of the air cylinder specifications on the piston drive frequency and energy conversion efficiency is clarified. By considering that the repulsion force of an air cylinder is nonlinear, the main factors that change the piston drive frequency were investigated by simulation. In addition, a piston drive frequency diagram was drawn based on the top surface area of the air cylinder and the compression ratio to discuss the effect of the air cylinder specifications on the piston drive frequency. The results indicate that the air cylinder specifications affect the piston drive frequency and generation force of a linear machine. Moreover, the structure of the air cylinder and the constraints on the maximum generation force of the linear machine narrow the possible operating range in the piston drive frequency. The air cylinder specifications based on the piston drive frequency diagram improved the FPEG energy conversion efficiency by 0.5%.

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Resonant Combustion Start Considering Potential Energy of Free-Piston Engine Generator

Cited by 7 publications

References 38 publications

Operation Range of Intermittent Velocity Control for Improving Top-Dead-Center Accuracy in Dual-Sided Free-Piston Engine Linear Generator

Operation Range of Intermittent Velocity Control for Improving Top-Dead-Center Accuracy in Dual-Sided Free-Piston Engine Linear Generator

Generator Design Considering Mover Action to Improve Energy Conversion Efficiency in a Free-Piston Engine Generator

Effect of Nonlinear Spring Characteristics on the Efficiency of Free-Piston Engine Generator

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