Impact of Dynamic Exhaust Valve Modelling 2019-01-2346
A method developed in SAE 2019-01-0058 to correct for deviations from quasi-steady exhaust valve flow is implemented on a single-cylinder GT-Power model and the effects on pumping work and blowdown pulse characteristics are investigated. The valve flow area is always reduced compared to the reference quasi-steady case. It decreases with higher pressure ratios over the valve and increases with higher engines speeds. The reduced flow area increases pumping work with load and engine speed, though primarily with engine speed. The magnitude of the blowdown pulse is reduced and the peak is shifted to a later crank angle.
Citation: Holmberg, T., Cronhjort, A., and Stenlåås, O., "Impact of Dynamic Exhaust Valve Modelling," SAE Technical Paper 2019-01-2346, 2019. Download Citation
Ted Holmberg, Andreas Cronhjort, Ola Stenlåås
KTH Royal Institute of Technology, Scania CV AB
2019 JSAE/SAE Powertrains, Fuels and Lubricants