Experimental verification of the model of electrohydraulic drive for internal combustion engine valves

The paper presents experimental electrohydraulic valve drive for internal combustion engine. The design is asingle-acting hydraulic actuator with spring return controlled by servovalve. Such solution shouldgive free control of valve lift, valve open and valve close time. In the article the principles of the operation of the drive are described. The paper focuses on exploring the dynamic of experimental electrohydraulic engine valve actuation system working in open-loop. For investigations the mathematical and simulation models were elaborated. The values of unknown coefficients of the models were intercepted on two test stands. First of them served to servovalve research. Second was built on the basis of the prototype drive and let on the research of the dynamics of the all drive. Chosen results of these investigations are placed in the article. The drive was explored for different oil supply pressures, control signals and spring mounting lifts. Experimental dates let to verified dynamic mathematical model. Comparisons of valve lift proceedings obtained from experiments and simulations are presented in the article. Verified model let to execute the analysis of the features of such drive and point necessary modifications for the correct realization of the process of the gas exchange in internal combustion engine.