Abstract
Electromagnetic linear actuators, as key executive components, have a vital impact on the performance of fully flexible variable valve trains. Considering that the conventional moving coil electromagnetic linear actuator (MCELA) has the disadvantages of low force density and a lack of end-passive self-holding ability, a novel composited electromagnetic linear actuator (CELA) is proposed by combining the performance advantages of MCELA and moving iron electromagnetic linear actuator (MIELA) in this work. Firstly, the structure and magnetic circuit design scheme of the proposed actuator are introduced and the finite element simulation model is established. The magnetic field distribution and force characteristics of the actuators are assessed by finite element simulation. Secondly, the construction of the prototype of the actuator is outlined, based on which the feasibility of the design scheme and the steady-state performance of the actuator are verified. Finally, the coordinated control strategy is proposed to realize the multi motion coordination control of the actuator. The research results show that the maximum starting force of the CELA with the end-passive self-holding ability is 574.92 N while the holding force can approach 229.25 N. Moreover, the CELA is proven to have excellent dynamic characteristics and control precision under different motion modes and to have an improved adaptability to the complex working conditions of internal combustion engines.
Highlights
After more than 100 years of development, internal combustion engines are widely used in various fields such as the automobile, ship, energy and national defense sectors, and play an important role in national economic development and national defense construction owing to its incomparable advantages in energy density, thermal efficiency, fuel flexibility and reliability [1,2,3,4]
The electromagnetic valve train is a typical representative of fully flexible variable valve technology, and the electromagnetic linear actuator is the core of the electromagnetic valve train [7,8,9,10]
MIElA is an auxiliary driving component based on the principle of minimum reluctance, and it is connected with the coil bracket of moving coil electromagnetic linear actuator (MCELA) to follow its movement
Summary
After more than 100 years of development, internal combustion engines are widely used in various fields such as the automobile, ship, energy and national defense sectors, and play an important role in national economic development and national defense construction owing to its incomparable advantages in energy density, thermal efficiency, fuel flexibility and reliability [1,2,3,4]. MCELA has a low force density, and its dynamic performance needs to be improved when facing high-pressure exhaust gas in the cylinder of internal combustion engines [24,25], and it lacks end-passive self-holding capacity, which will lead to increased energy consumption. To this end, a composited electromagnetic linear actuator with fast response, high efficiency and energy saving features (CELA) is proposed in this paper. The coordinated control strategy is proposed, and the dynamic performance test is carried out to verify the feasibility of the composited structure
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