Precise piston trajectory control for a free piston engine |
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| Affiliation: | 1. Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle upon Tyne NE1 7RU, UK;2. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;1. Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom;2. Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia;1. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China;2. College of Traffic & Transportation, Chongqing Jiaotong University, Chongqing 400074, China;3. Sir Joseph Swan Centre for Energy Research, Newcastle University, Newcastle upon Tyne NE1 7RU, UK;1. Graduate School of Mechanical and Automotive Engineering, University of Ulsan, San 29, Mugeo2-dong, Nam-gu, Ulsan 680-749, Republic of Korea;2. Department of Mechanical and Automotive Engineering, University of Ulsan, San 29, Mugeo2-dong, Nam-gu, Ulsan 680-749, Republic of Korea;3. Department of System Design Engineering, Keio University, Tokyo, Japan;1. College of Traffic & Transportation, Chongqing Jiaotong University, Chongqing 400074, China;2. School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | A free piston engine removes the mechanical constraint on the piston motion by eliminating the crankshaft. The extra degree of freedom offers many advantages for reducing fuel consumption and emissions. Nevertheless, stability and robustness of the engine operation has been affected in the meantime. To ensure smooth engine operation, an active motion controller, which utilizes robust repetitive control, was developed previously to regulate the piston motion of a hydraulic free piston engine to track pre-defined trajectories. However, the long piston stroke length, high operating frequency and system nonlinearity impose challenges to precise piston motion control. Therefore, feedforward controllers are investigated in this paper to complement the repetitive control to further improve the tracking performance. The first feedforward design involves the inversion of a linear plant model that describes the dynamics of the engine operation, and the second design is based on the flatness approach, which involves the inversion of a nonlinear model of the system. The two feedforward controllers are designed and implemented on the free piston engine. The experimental and simulation results demonstrate the effectiveness of the proposed control under various operating conditions and reference piston trajectories. |
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| Keywords: | Free piston engine Feedforward control Repetitive control Tracking Hydraulic actuators |
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