Perspectives of the fully variable valve train univalve on the basis of a 2.0 l spark-ignition engine

MTZ worldwide ◽  
2006 ◽  
Vol 67 (7-8) ◽  
pp. 25-28
Author(s):  
Rudolf Flierl ◽  
Daniel Gollasch ◽  
Andreas Knecht ◽  
Dirk Pohl ◽  
Wilhelm Hannibal
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Valve Train ◽  
Variable Valve Train ◽  
Variable Valve

Cylinder Deactivation with Mechanically Fully Variable Valve Train

2012 ◽  
Vol 5 (2) ◽  
pp. 207-215 ◽  
Author(s):  
Rudolf Flierl ◽  
Frederic Lauer ◽  
Michael Breuer ◽  
Wilhelm Hannibal
Keyword(s):  
Valve Train ◽  
Cylinder Deactivation ◽  
Variable Valve Train ◽  
Variable Valve

Variable Valve Train Concept for Compliance with Future Diesel Emission Standards

MTZ worldwide ◽  
2021 ◽  
Vol 82 (2) ◽  
pp. 36-41
Author(s):  
Michael Elicker ◽  
Wolfgang Christgen ◽  
Jahaazeb Kiyanni ◽  
Maximilian Brauer
Keyword(s):  
Valve Train ◽  
Emission Standards ◽  
Variable Valve Train ◽  
Diesel Emission ◽  
Variable Valve

Experimental research on pumping losses and combustion performance in an unthrottled spark ignition engine

2018 ◽  
Vol 232 (7) ◽  
pp. 888-897 ◽  
Author(s):  
Tingting Sun ◽  
Yingjie Chang ◽  
Zongfa Xie ◽  
Kaiyu Zhang ◽  
Fei Chen ◽  
...  
Keyword(s):  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Valve Lift ◽  
Combustion Characteristic ◽  
Spark Ignition Engines ◽  
Intake Valve ◽  
Valve System ◽  
Combustion Performance ◽  
Intake Swirl ◽  
Variable Valve

A novel fully hydraulic variable valve system is described in this paper, which achieves continuous variations in maximum valve lift, valve opening duration, and the timing of valve closing. The load of the unthrottled spark ignition engine with fully hydraulic variable valve system is controlled by using an early intake valve closing rather than the conventional throttle valve. The experiments were carried out on BJ486EQ spark ignition engine with fully hydraulic variable valve system. Pumping losses of the throttled and unthrottled spark ignition engines at low-to-medium loads are compared and the reason of it decreasing significantly in the unthrottled spark igntion engine is analyzed. The combustion characteristic parameters, such as cyclic variation, CA50, and heat release rate, were analyzed. The primary reasons for the lower combustion rate in the unthrottled spark ignition engines are discussed. In order to improve the evaporation of fuel and mix with air in an unthrottled spark ignition engine, the in-cylinder swirl is organized with a helical intake valve, which can generate a strong intake swirl at low intake valve lifts. The effects of the intake swirl on combustion performance are investigated. Compared with the throttled spark ignition engine, the brake specific fuel consumption of the improved unthrottled spark ignition engine is reduced by 4.1% to 11.2%.

3- Cylinder SI Engine with fully variable Valve Train – UpValve on Intake and Exhaust Side

2017 ◽  
pp. 27-44
Author(s):  
M. Breuer ◽  
G. Bartsch ◽  
R. Friedfeldt ◽  
U. Heiter ◽  
U. Kramer ◽  
...  
Keyword(s):  
Valve Train ◽  
Si Engine ◽  
Variable Valve Train ◽  
Variable Valve

Frictional Performance of the fully variable Valve Train UpValve

2019 ◽  
pp. 45-62
Author(s):  
M. Breuer ◽  
D. Furtado ◽  
K. Grimm ◽  
S. Moormann ◽  
S. Schmitt ◽  
...  
Keyword(s):  
Valve Train ◽  
Frictional Performance ◽  
Variable Valve Train ◽  
Variable Valve
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