Investigations on Ventilation Strategies for SI Cylinder Deactivation Based on a Variable Valve Train

2016 ◽  
Author(s):  
Wolfram Gottschalk ◽  
Rene Fink ◽  
Matthias Schultalbers
Keyword(s):  
Valve Train ◽  
Cylinder Deactivation ◽  
Variable Valve Train ◽  
Ventilation Strategies ◽  
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

scholarly journals Study on Valve Strategy of Variable Cylinder Deactivation Based on Electromagnetic Intake Valve Train

2018 ◽  
Vol 8 (11) ◽  
pp. 2096 ◽  
Author(s):  
Maoyang Hu ◽  
Siqin Chang ◽  
Yaxuan Xu ◽  
Liang Liu
Keyword(s):  
Gasoline Engine ◽  
Transition Period ◽  
Valve Train ◽  
Exhaust Pipe ◽  
Intake Valve ◽  
Cylinder Deactivation ◽  
Engine Model ◽  
Brake Mean Effective Pressure ◽  
Variable Valve Train ◽  
Variable Valve

The camless electromagnetic valve train (EMVT), as a fully flexible variable valve train, has enormous potential for improving engine performances. In this paper, a new valve strategy based on the electromagnetic intake valve train (EMIV) is proposed to achieve variable cylinder deactivation (VCD) on a four-cylinder gasoline engine. The 1D engine model was constructed in GT-Power according to test data. In order to analyze the VCD operation with the proposed valve strategy, the 1D model was validated using a 3D code. The effects of the proposed valve strategy were investigated from the perspective of energy loss of the transition period, the mass fraction of oxygen in the exhaust pipe, and the minimum in-cylinder pressure of the active cycle. On the premise of avoiding high exhaust oxygen and oil suction, the intake valve timing can be determined with the variation features of energy losses. It was found that at 1200 and 1600 rpm, fuel economy was improved by 12.5–16.6% and 9.7–14.6%, respectively, under VCD in conjunction with the early intake valve closing (EIVC) strategy when the brake mean effective pressure (BMEP) ranged from 0.3 MPa to 0.2 MPa.

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

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

Variable Intake Valve Train to Optimize the Performance of a Large Bore Gas Engine

2016 ◽  
Author(s):  
Jan Zelenka ◽  
Claudio Hoff ◽  
Andreas Wimmer ◽  
Roland Berger ◽  
Josef Thalhauser
Keyword(s):  
Valve Train ◽  
Experimental Investigations ◽  
Intake Valve ◽  
Valve Timing ◽  
Current Standard ◽  
Gas Engine ◽  
Engine Efficiency ◽  
Variable Valve Train ◽  
Operating Strategies ◽  
Variable Valve

The present paper describes the investigations made using the electro-hydraulic intake valve timing system VCM® on a large bore gas engine. The first section explains what challenges have to be faced when developing concepts for present and future applications of large bore gas engines. Following an introduction to the VCM® system, an outline is presented of expected opportunities for using variable intake valve timing in combination with modern turbocharging concepts. The second section describes 0D/1D engine cycle simulations that were carried out to assess the influence of variable valve timing on the intake side compared to a fixed intake valve profile, which is the current standard for large bore gas engines. As a result, first predictions can be made about the gain in engine efficiency achieved with different operating strategies. In order to assess the performance potentials of the variable valve train, extensive experimental investigations were carried out on a single cylinder research engine based on GE’s Type 6 gas engine. The investigations consisted of varying engine parameters including varying the geometric compression ratio as well as the engine boundary conditions. It will be shown how intake valve timing can be used to optimize engine efficiency by improving gas exchange. Furthermore, variable intake valve timing affects the overall system behavior, e.g. distances to the engine’s operating limits. Special attention was paid to analyzing combustion itself, which is necessary due to the strong influence that intake valve timing has on the thermodynamic states of the cylinder charge.

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