scholarly journals Research on starting process and control strategy of opposed-piston free-piston engine generator _ Simulation and test results

2021 ◽  
Vol 7 ◽  
pp. 4977-4987
Author(s):  
Limin Wu ◽  
Huihua Feng ◽  
Ziwei Zhang ◽  
Zhifeng Tang ◽  
Boru Jia ◽  
...  
Keyword(s):  
Control Strategy ◽  
Test Results ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Starting Process ◽  
And Control

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 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.

scholarly journals Investigation of the Starting Process of Free-piston Engine Generator by Mechanical Resonance

2014 ◽  
Vol 61 ◽  
pp. 572-577 ◽  
Author(s):  
Boru Jia ◽  
Zhengxing Zuo ◽  
Huihua Feng ◽  
Guohong Tian ◽  
A.P. Roskilly
Keyword(s):  
Piston Engine ◽  
Mechanical Resonance ◽  
Free Piston ◽  
Free Piston Engine ◽  
Starting Process

An experimental investigation into the starting process of free-piston engine generator

2015 ◽  
Vol 157 ◽  
pp. 798-804 ◽  
Author(s):  
Boru Jia ◽  
Guohong Tian ◽  
Huihua Feng ◽  
Zhengxing Zuo ◽  
A.P. Roskilly
Keyword(s):  
Experimental Investigation ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine ◽  
Starting Process

Effect of closed-loop controlled resonance based mechanism to start free piston engine generator: Simulation and test results

2016 ◽  
Vol 164 ◽  
pp. 532-539 ◽  
Author(s):  
Boru Jia ◽  
Zhengxing Zuo ◽  
Huihua Feng ◽  
Guohong Tian ◽  
Andrew Smallbone ◽  
...  
Keyword(s):  
Closed Loop ◽  
Test Results ◽  
Piston Engine ◽  
Free Piston ◽  
Free Piston Engine

Study on the Starting Process Driven by Accumulator of a Hydraulic Free Piston Engine

2011 ◽  
Vol 121-126 ◽  
pp. 3092-3096
Author(s):  
Bi Zhong Xia ◽  
Gang Su ◽  
Hai Bo Xie ◽  
Hua Yong Yang
Keyword(s):  
Mathematical Model ◽  
Control Valve ◽  
Piston Engine ◽  
Free Piston ◽  
Directional Control ◽  
Free Piston Engine ◽  
Hydraulic Accumulator ◽  
Starting Process ◽  
The Mathematical Model ◽  
Directional Control Valve

Starting system plays an important role in a hydraulic free piston engine (HFPE) and hydraulic accumulator/directional control valve combination is often employed. In this paper, the starting process of a typical starting system composed of a hydraulic bladder accumulator is firstly described, and then the mathematical model of the starting system is established and analyzed as well as some special situations are discussed.

Design of Electronic Control System for Free-Piston Engine Generator

2014 ◽  
Vol 538 ◽  
pp. 417-420
Author(s):  
Dao Jing Wang ◽  
Yi Tong Jiang ◽  
Fu Shui Liu
Keyword(s):  
Control System ◽  
Modular Design ◽  
Electronic Control ◽  
Single Chip ◽  
Piston Engine ◽  
Free Piston ◽  
Differential Signal ◽  
Electronic Control System ◽  
Free Piston Engine ◽  
And Control

Based on Infineon XC167, an electronic control system was designed for internal combustion free piston engine generator (FPEG). The displacement was output in form of 4 channel differential signal by Coaxial magnetic grid, so the signal processing circuit was designed, and the displacement signal can be trapped by single-chip micro-controller; according to the current displacement, the ignition pulse width and ignition position was calculated by the single-chip micro-controller, ignition pulse was output; the operation parameter was monitored and control parameter was adjusted by PC. The test results show that: modular design was introduced in the design of electric control system, and it monitors and controls the FPEG accurately, the control objectives are achieved.

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