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Modeling of Exhaust Valve Opening in a Camless Engine
Technical Paper
2002-01-0376
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
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.
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Authors
- C. Schernus - FEV Motorentechnik GmbH
- F. van der Staay - FEV Motorentechnik GmbH
- H. Janssen - FEV Motorentechnik GmbH
- J. Neumeister - FEV Motorentechnik GmbH
- L. Donce - Johnson Controls Automotive Electronics SA
- I. Estlimbaum - Johnson Controls Automotive Electronics SA
- E. Nicole - Johnson Controls Automotive Electronics SA
- C. Maerky - Johnson Controls Automotive Electronics SA
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.Also In
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