Challenges facing future high performance combustion engines using Porsche Boxer engines as an example

2017 ◽  
pp. 29-42
Author(s):  
Thomas Wasserbäch ◽  
Jörg Kerner ◽  
Markus Baumann
Keyword(s):  
High Performance ◽  
Combustion Engines

A Novel Electromechanical Solution for Cam-Switching in High Performance Internal Combustion Engines

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Andrea De Martin ◽  
Giovanni Jacazio ◽  
Massimo Sorli
Keyword(s):  
High Performance ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Valve Lift ◽  
Combustion Engines ◽  
Critical Aspect ◽  
Conceptual Design Phase ◽  
Common Strategy ◽  
Switch System

Abstract The variation of the valve lift is a fairly common strategy currently adopted in several in-service internal combustion engines to optimize their performance depending on the operating conditions of the vehicle. The most critical aspect to consider during the conceptual design phase of a cam switch system is the extremely narrow window of opportunity to perform the cam change, which duration is defined by the time during which the corresponding valve lift is null. To meet this requirement and ensure safe, repeatable movements, a novel architecture based on the combination of a new electromechanical actuator and its dedicated control system is presented. The architecture is at first introduced with reference to the numerous examples available in the literature, and hence mathematically described. The dynamic model of the system derived from the presented equation is then used to study the performance of the presented solution and define its control strategy. Results are finally presented and discussed.

scholarly journals Review of Modern Vehicle Powertrains and Their Modelling and Simulation in MATLAB/Simulink

2020 ◽  
Vol 5 (2) ◽  
pp. 232-250
Author(s):  
Attila Szántó ◽  
Gusztáv Áron Szíki
Keyword(s):  
High Performance ◽  
Internal Combustion Engines ◽  
Road Transport ◽  
Combustion Engines ◽  
Environmental Standards ◽  
Matlab Simulink ◽  
Technological Advances ◽  
Usage Patterns ◽  
Drive Systems ◽  
Dynamics Simulations

Thanks to technological advances and environmental standards, as well as changing usage patterns, road vehicles are constantly developing. Electric and hybrid vehicles are playing an increasingly important role in today’s road transport. The most significant changes are probably in the powertrain of vehicles. The efficiency of internal combustion engines increases while their emissions continue to decline. In addition, high performance electric motors, batteries and even fuel cells play an increasingly important role in hybrid and electric vehicles. In this publication, we review the drive systems of current modern vehicles and the types and characteristics of their major components. We also review the available models and computer programs for their simulation, focusing mainly on MATLAB/Simulink applications. Based on this, we can develop our own models and simulation programs which will help us to perform different driving dynamics simulations and to compare the performance, dynamic and energetic characteristics of these powertrains and their components to each other.

Application of High Performance Computing for Simulating Cycle-to-Cycle Variation in Dual-Fuel Combustion Engines

2016 ◽  
Author(s):  
Ravichandra S. Jupudi ◽  
Charles E.A. Finney ◽  
Roy Primus ◽  
Sameera Wijeyakulasuriya ◽  
Adam E. Klingbeil ◽  
...  
Keyword(s):  
High Performance Computing ◽  
High Performance ◽  
Fuel Combustion ◽  
Dual Fuel ◽  
Combustion Engines ◽  
Cycle Variation ◽  
Dual Fuel Combustion ◽  
Performance Computing

A study of heat flux in a constant-volume combustion chamber

2003 ◽  
Vol 217 (9) ◽  
pp. 825-832 ◽  
Author(s):  
Chi-Woo Lee ◽  
Chi-Won Kim ◽  
Si-Pom Kim
Keyword(s):  
Heat Flux ◽  
Combustion Chamber ◽  
High Performance ◽  
Internal Combustion Engines ◽  
Constant Volume ◽  
Cylinder Wall ◽  
Combustion Engines ◽  
Constant Volume Combustion ◽  
Constant Volume Combustion Chamber ◽  
Instantaneous Temperature

In the production of internal combustion engines, there has been a move towards the development of high-performance engines with fuel economy, lighter weights and smaller sizes. These trends help to answer problems related to thermal load and abnormal combustion, etc., in these engines. In order to clarify these problems, a thin film-type probe for instantaneous measurement of surface temperatures has been suggested. A method for manufacturing such a probe was established in this study. The instantaneous surface temperature of a constant-volume combustion chamber was measured by this probe, and heat flux was calculated and analysed with a Fourier series. For a thorough understanding of the characteristics of combustion, the authors measured the wall temperature of the combustion chamber and computed heat flux through a cylinder wall while varying the protrusion height of the probe. To achieve the above goals, an instantaneous temperature probe was developed, thereby making possible the analysis of the instantaneous temperature of the wall surface and unsteady heat flux in the constant-volume combustion chamber.

Progress in high performance, low emissions, and exergy recovery in internal combustion engines

2016 ◽  
Vol 41 (9) ◽  
pp. 1229-1241 ◽  
Author(s):  
Plamen Punov ◽  
Teodossi Evtimov ◽  
Radu Chiriac ◽  
Adrian Clenci ◽  
Quentin Danel ◽  
...  
Keyword(s):  
High Performance ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines

scholarly journals Simulation of Dynamic Stresses on High Performance Engine Valve Spring System Considering Coil Clashing Effect

2021 ◽  
pp. 108-113
Author(s):  
Michele Calabretta ◽  
Alessandro Sitta ◽  
Salvatore Massimo Oliveri ◽  
Gaetano Sequenzia
Keyword(s):  
High Performance ◽  
Engine Speed ◽  
Combustion Process ◽  
Contact Forces ◽  
Valve Train ◽  
Combustion Engines ◽  
Dynamic Stresses ◽  
Durability Analysis ◽  
Spring Force ◽  
High Engine Speed

AbstractThe valve train plays a major role in the performance of internal combustion engines by controlling the combustion process and it is therefore one of the key aspects for increasing the efficiency of combustion engines. Considering the dynamics, the spring force must be high enough to reliably close the valve preventing from seating bouncing due to surge modes after the valve closure. On the other side, the spring force should be kept as low as possible in order to reduce the engine friction losses and consequently the fuel consumption. In the high-performance engines, the valve springs have to be designed and optimized for sustaining higher stresses with compact dimensions leading to critical material and manufacturing processes. This requires a reduction of moving masses and a strong focus on design and process optimization of the coil springs for reducing the mechanical load and the friction losses at low engine speed. At the same time, valve train should be reliable at high engine speed. The calculation of stresses and contact forces for moving parts under dynamic load is essential for durability analysis. A method to calculate the contact of moving masses is described and proposed to justify valve motions experimental results. To fully understand the failure mechanism of test bed reliability trials, the dynamic stresses have been calculated modeling the real springs’ shape. The contact forces have been reproduced considering the coil clash effects and the dynamic behavior of the flexible spring.

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