Design and Analysis of a Fully Variable Valve Actuation System

Longxin Jiang, Liang Liu, Xiaowei Peng and Zhaoping Xu
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Longxin Jiang: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Liang Liu: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Xiaowei Peng: Shanghai Space Control Technology Research Institute, Shanghai 201109, China
Zhaoping Xu: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Energies, 2020, vol. 13, issue 23, 1-16

Abstract: With the problem of environmental pollution and energy shortage becoming more and more serious, the fuel efficiency of automobile engines has attracted much attention, and variable valve technology is one of the important technologies to solve this problem. A novel fully variable valve actuation (FVVA) system based on a brushless direct current motor (BLDCM) is designed to achieve fully variable valve adjustment. The system uses a crank-moving guide rod mechanism to convert the rotary motion of the BLDCM into the linear motion of the valve. The fully variable valve system can realize real-time continuous adjustment of valve operating parameters through the motion control of BLDCM, including variable valve timing, variable valve opening duration, and variable lift. A BLDCM and a transmission mechanism for the FVVA system is designed in this paper. In order to better analyze the performance of the system, a dynamic model is established. Then, a three closed-loop control method is adopted to realize position control of the valve. Finally, a complete system model is established to verify the theory conclusions. The results show that the system can realize fully variable valve adjustment.

Keywords: fully variable valve actuation; BLDCM; crank-moving guide rod mechanism; motion control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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