Development of Free Piston Engine Linear Generator System Part 2 - Investigation of Control System for Generator

2014 ◽  
Author(s):  
Shigeaki Goto ◽  
Kaznunari Moriya ◽  
Hidemasa Kosaka ◽  
Tomoyuki Akita ◽  
Yoshihiro Hotta ◽  
...  
Keyword(s):  
Control System ◽  
Piston Engine ◽  
Generator System ◽  
Free Piston ◽  
Linear Generator ◽  
Free Piston Engine ◽  
System Part

Development of Free Piston Engine Linear Generator System Part 1 - Investigation of Fundamental Characteristics

2014 ◽  
Author(s):  
Hidemasa Kosaka ◽  
Tomoyuki Akita ◽  
Kazunari Moriya ◽  
Shigeaki Goto ◽  
Yoshihiro Hotta ◽  
...  
Keyword(s):  
Piston Engine ◽  
Generator System ◽  
Free Piston ◽  
Linear Generator ◽  
Free Piston Engine ◽  
System Part

Development of free piston engine linear generator system and a resonant pendulum type control method

2020 ◽  
pp. 146808742093124
Author(s):  
Hidemasa Kosaka ◽  
Tomoyuki Akita ◽  
Shigeaki Goto ◽  
Yoshihiro Hotta
Keyword(s):  
Control Method ◽  
Experimental Result ◽  
Piston Engine ◽  
Piston Motion ◽  
Generator System ◽  
Free Piston ◽  
Linear Generator ◽  
Reference Profile ◽  
Cycle Simulation ◽  
Free Piston Engine

A free piston engine linear generator, which has the potential of the compact physique, high brake efficiency and high flexibility for fuel, has been developed. The developed free piston engine linear generator consists of a two-stroke combustion unit, an air-bounce chamber and a linear generator. The key technologies to realize the continuous operation are the control method and lubricating and cooling strategies. The proposed structure is featured as a piston shape with two different diameters coaxially, called a “W-shape” piston, which has an empty space inside for the oil cooling path. The performance of the structure is evaluated by a one-dimensional cycle simulation. The result indicates the possible output power of 10 kW and thermal efficiency of 42% using premixed charge compression ignition combustion strategy. The control method is another challenge of the free piston engine linear generator. This work proposes two strategies of the position feedback control method and the resonant pendulum type control method. The first method has the function of the feedback loops for the piston position and velocity so that the piston motion follows the reference profile calculated in advance. The experimental results show the limited range of operation because the fixed profile does not absorb the deviation of the piston motion due to the combustion deviation. The second method is based on the speed control without a fixed reference profile of the piston motion. The experimental result shows the robustness to the change in operating parameters such as ignition position, amount of fuel and desired power output.

scholarly journals Operation Range of Generation Braking Force to Achieve High Efficiency Considering Combustion in a Free-Piston Engine Linear Generator System

2018 ◽  
Vol 7 (4) ◽  
pp. 343-350 ◽  
Author(s):  
Mitsuhide Sato ◽  
Masami Nirei ◽  
Yuichiro Yamanaka ◽  
Hironobu Murata ◽  
Yinggang Bu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Piston Engine ◽  
Generator System ◽  
Free Piston ◽  
Linear Generator ◽  
Free Piston Engine ◽  
Braking Force

Effect of Copper Loss Reduction with Output Dispersion in a Free-Piston Engine Linear Generator System

2019 ◽  
Vol 139 (1) ◽  
pp. 69-75 ◽  
Author(s):  
Mitsuhide Sato ◽  
Masami Nirei ◽  
Yuichiro Yamanaka ◽  
Tatsuki Suzuki ◽  
Takumi Goto ◽  
...  
Keyword(s):  
Loss Reduction ◽  
Piston Engine ◽  
Generator System ◽  
Free Piston ◽  
Linear Generator ◽  
Copper Loss ◽  
Free Piston Engine ◽  
Effect Of Copper

Improving the constant‐volume degree of combustion considering generatable range at low speed in a free‐piston engine linear generator system

2019 ◽  
Vol 14 (11) ◽  
pp. 1703-1710 ◽  
Author(s):  
Mitsuhide Sato ◽  
Kaname Naganuma ◽  
Masami Nirei ◽  
Yuichiro Yamanaka ◽  
Tatsuki Suzuki ◽  
...  
Keyword(s):  
Constant Volume ◽  
Piston Engine ◽  
Generator System ◽  
Free Piston ◽  
Low Speed ◽  
Linear Generator ◽  
Free Piston Engine
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