scholarly journals A Reciprocating Motion Control Strategy of Single-Cylinder Free-Piston Engine Generator

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 245 ◽  
Author(s):  
Hao Yan ◽  
Zhaoping Xu ◽  
Jinkang Lu ◽  
Dong Liu ◽  
Xiaohui Jiang
Keyword(s):  
Motion Control ◽  
Control Strategy ◽  
Electrical Power ◽  
Reciprocating Motion ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Finite State ◽  
Turning Center ◽  
Combined Simulation

Free-piston engine generator is a novel electrical power generating system developed for electric vehicles, and it is labeled as a more efficient power system than conventional engines. This paper proposes a reciprocating motion control strategy of free piston to enable the stable running of the system. The control problem was decomposed to the stroke control, the top turning center (TTC) control, and the bottom turning center (BTC) control for reducing unnecessary energy consumption during the control. An iterative learning controller (ILC) was designed for the TTC control, the BTC control was based on the combustion states estimation, and the stroke control was based on finite-state machine (FSM). The turning centers of the previous stroke and the maximum cylinder pressure of the current stroke were taken for feedback. A combined simulation model including the combustion cycle fluctuation was presented and validated by the prototype, and the performance of the control strategy was analyzed. The results showed that the system obtained the stable running and the reciprocating motion of the free piston was well controlled.

A Starting Control Strategy of Single-Cylinder Two-Stroke Free-Piston Engine Generator

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Jinkang Lu ◽  
Zhaoping Xu ◽  
Dong Liu ◽  
Liang Liu
Keyword(s):  
Control Strategy ◽  
Cold Start ◽  
Combustion Model ◽  
Piston Engine ◽  
Free Piston ◽  
Single Cylinder ◽  
Free Piston Engine ◽  
Start Up ◽  
Turning Center ◽  
Starting Process

Abstract Free-piston engine generator is a novel energy conversion system, which is known to have advantages of variable compression ratio and variable fuel. The free-piston must be controlled to overcome challenges like misfire, after-combustion, and other abnormal combustion in the starting process, as well as to prevent the piston from colliding with the cylinder head. This article proposes a control strategy based on the combustion state for the cold start-up process of single-cylinder two-stroke free-piston engine generator. The combustion state is judged based on in-cylinder pressure at the early beginning of expansion stroke, and the duration and direction of coil current are adjusted to ensure the aimed bottom turning center of the stroke. A control-oriented model including the cold start-up combustion model of the prototype is presented, and the control strategy is verified by the experiment of the prototype. The results show that the free-piston engine generator can start successfully and overcome abnormal combustion during the cold start-up process.

scholarly journals Piston motion control of a free-piston engine generator: A new approach using cascade control

2016 ◽  
Vol 179 ◽  
pp. 1166-1175 ◽  
Author(s):  
Boru Jia ◽  
Rikard Mikalsen ◽  
Andrew Smallbone ◽  
Zhengxing Zuo ◽  
Huihua Feng ◽  
...  
Keyword(s):  
Motion Control ◽  
Cascade Control ◽  
Piston Engine ◽  
Piston Motion ◽  
Free Piston ◽  
New Approach ◽  
Free Piston Engine
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