Modeling of Exhaust Valve Opening in a Camless Engine

2002-01-0376

03/04/2002

Event
SAE 2002 World Congress & Exhibition
Authors Abstract
Content
Electromechanical valve trains in camless engines enable virtually fully variable valve timing that offers large potential for both part load fuel economy and high low end torque. Based upon the principle of a spring-mass-oscillator, the actuator stores the energy to open and close the valves in springs. However, the motion of the valves and the electromechanical actuation suffers from parasitic losses, such as friction and ohmic resistance. Besides eddy current losses, gas forces obviously play a further important role in the control of exhaust valve opening especially at high engine speeds and loads. Based on engine test bench data, computational simulations (3D CFD, gas exchange process and electromechanical system) are carried out to analyze the effects of exhaust valve gas forces on the dynamic motion of valve and actuator. The modeling approach and results of this investigation are discussed in this paper.
Meta TagsDetails
DOI
https://doi.org/10.4271/2002-01-0376
Pages
15
Citation
Schernus, C., van der Staay, F., Janssen, H., Neumeister, J. et al., "Modeling of Exhaust Valve Opening in a Camless Engine," SAE Technical Paper 2002-01-0376, 2002, https://doi.org/10.4271/2002-01-0376.
Additional Details
Publisher
Published
Mar 4, 2002
Product Code
2002-01-0376
Content Type
Technical Paper
Language
English