Abstract
The increasing demands on safety, emission and fuel consumption require more accurate control models of micro internal combustion swing engine (MICSE). The objective of this paper is to investigate the constant speed control models of four-stroke MICSE. The operation principle of the four-stroke MICSE is presented based on the description of MICSE prototype. A two-level Petri net based hybrid model is proposed to model the four-stroke MICSE engine cycle. The Petri net subsystem at the upper level controls and synchronizes the four Petri net subsystems at the lower level. The continuous sub-models, including breathing dynamics of intake manifold, thermodynamics of the chamber and dynamics of the torque generation, are investigated and integrated with the discrete model in MATLAB Simulink. Through the comparison of experimental data and simulated DC voltage output, it is demonstrated that the hybrid model is valid for the four-stroke MICSE system. A nonlinear model is obtained from the cycle average data via the regression method, and it is linearized around a given nominal equilibrium point for the controller design. The feedback controller of the spark timing and valve duration timing is designed with a sequential loop closing design approach. The simulation of the sequential loop closure control design applied to the hybrid model is implemented in MATLAB. The simulation results show that the system is able to reach its desired operating point within 0.2 s, and the designed controller shows good MICSE engine performance with a constant speed. This paper presents the constant speed control models of four-stroke MICSE and carries out the simulation tests, the models and the simulation results can be used for further study on the precision control of four-stroke MICSE.
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Supported by National Natural Science Foundation of China (Grant No. 51475422), and Science Fund for Creative Research Groups of National Natural Science Foundation of China (Grant No. 51221004)
GAO Dedong, born in 1980, is currently a PhD candidate at State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China. He is a lecturer at School of Mechanical Engineering, Qinghai University, China. He received his master degree from Tsinghua University, China, in 2007. His research interests are computer simulation and bio-manufacturing.
LEI Yong, born in 1976, is currently an associate professor at State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China. He received his PhD degree from University of Michigan, USA, in 2007. His research interests include fault analysis, intelligent maintenance and precision control.
ZHU Honghai, born in 1977, received his PhD degree from The University of Michigan, Ann Arbor, USA, in 2006. His research interests include Modeling and control of combustion engines
NI Jun, is currently a professor in University of Michigan, USA. He received his PhD degree from the University of Wisconsin-Madison, USA, in 1987. His research interests include precision machining, micro/meso systems and manufacturing processes, manufacturing process modeling and control, statistical quality design and improvement, etc.
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Gao, D., Lei, Y., Zhu, H. et al. Constant speed control of four-stroke micro internal combustion swing engine. Chin. J. Mech. Eng. 28, 971–982 (2015). https://doi.org/10.3901/CJME.2015.0512.070
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DOI: https://doi.org/10.3901/CJME.2015.0512.070