Design and Performance Evaluation of an Electro-Hydraulic Camless Engine Valve Actuator for Future Vehicle Applications

Abstract

This paper details the new design and dynamic simulation of an electro-hydraulic camless engine valve actuator (EH-CEVA) and experimental verification with lift position sensors. In general, camless engine technologies have been known for improving fuel efficiency, enhancing power output, and reducing emissions of internal combustion engines. Electro-hydraulic valve actuators are used to eliminate the camshaft of an existing internal combustion engines and used to control the valve timing and valve duration independently. This paper presents novel electro-hydraulic actuator design, dynamic simulations, and analysis based on design specifications required to satisfy the operation performances. An EH-CEVA has initially been designed and modeled by means of a powerful hydraulic simulation software, AMESim, which is useful for the dynamic simulations and analysis of hydraulic systems. Fundamental functions and performances of the EH-CEVA have been validated through comparisons with experimental results obtained in a prototype test bench.

Modeling of Magnetic Field and Transients in a Novel Permanent Magnet Valve Actuator

“…Contrary to the electro-hydraulic valve actuators, our construction does not need the hydraulic block and, despite this, it achieves low switching times (5 ms). The obtained values of the runner stroke times are similar to those obtained in [2] and [3]. The presented paper is a substantial extended version of the conference ISEF 2019 presentation [12], and gives more details about the described actuator design.…”

“…Otherwise, in most other constructions the current exists permanently [5][6][7][8]. To obtain high force values (above 400 N), electro-hydraulic construction is used [2][3][4]. Thanks to this, their switching times are relatively short (3-5 ms).…”

“…To perform the analysis, our field-circuit model is characterized by a relatively small execution time-we executed our analysis in a few seconds. There are faster models based on the circuit theory, but they can be applied only for relatively simple geometries [2,3,6].…”

“…There are two main ways to do this. The first one is the use of hydraulic or electro-hydraulic actuators [2][3][4], and the second one can be the application of fully electromagnetic ones [5][6][7][8][9][10][11].…”

Novel Design and Modeling of Shutter Valves for Camless Engines

“…Current research in the field of camless engines is focused upon poppet valves. They have controlled either through electro-hydraulic (Nam, Cho, Park, & Choi, 2017), electro-pneumatic or electro-magnetic circuits (Chen, Chang & Fan, 2019). The authors Tai, Stubbs and Tsao (2001) have developed electromagnetic valves by using grey box approach through which system identification and mathematical modelling was performed.…”