ElectroMagnetic Valve Actuation System e-Valve: Convergence Point between Requirements of Fuel Economy and Cost Reduction

2010 ◽  
Author(s):  
Alain Frederic ◽  
Vanessa Picron ◽  
Julien Hobraiche ◽  
Nicolas Gelez ◽  
Sylvain Gouiran
Keyword(s):  
Fuel Economy ◽  
Cost Reduction ◽  
Electromagnetic Valve ◽  
Actuation System ◽  
Convergence Point ◽  
Valve Actuation

Electromagnetic Valve Actuation System With Two Configurations

2009 ◽  
Author(s):  
Rudolf Seethaler ◽  
Konrad Duerr
Keyword(s):  
High Speed ◽  
Digital Simulation ◽  
Valve Train ◽  
Electromagnetic Valve ◽  
High Speed Engine ◽  
Actuation System ◽  
Control Scheme ◽  
Cam Profile ◽  
Actuation Devices ◽  
Valve Actuation

Electromagnetic valve actuation systems for automotive combustion engines must provide extremely fast valve motion when the engine speed is high, but they also need to ensure low valve seating velocities during engine idle. These two constraints are difficult to combine in conventional spring assisted electromagnetic valve actuation devices that operate at a fixed resonance frequency. This paper focuses on a mechanism with two distinct configurations for low and high speed engine operations respectively. The mechanism is based on two pivoting cams. The synthesis of the cam profile ultimately determines the performance of the actuation system. An algorithm is presented that provides a time optimum cam profile for the high speed cam. The low speed cam is designed to allow for servo control of the valve system. A control scheme that aims to minimize electric losses in the drive system is also introduced. Both the cam synthesis algorithms and the control algorithm are applied to a typical automotive valve train and a digital simulation is used to validate the effectiveness of the mechanical cam design and control scheme.

Effects of design and operating parameters on the static and dynamic performance of an electromagnetic valve actuator

2003 ◽  
Vol 217 (3) ◽  
pp. 193-201 ◽  
Author(s):  
S-H Park ◽  
J Lee ◽  
J Yoo ◽  
D Kim ◽  
K Park
Keyword(s):  
Simulation Model ◽  
New Technology ◽  
Dynamic Performance ◽  
Operating Parameters ◽  
Computer Simulation Model ◽  
Neutral Position ◽  
Electromagnetic Valve ◽  
Actuation System ◽  
Si Engines ◽  
Actuation Devices

The electromagnetic valve (EMV) actuation system is a new technology for improvement in fuel effciency and reduction in emissions in spark ignition (SI) engines. It can provide more flexibility in valve event control compared with conventional variable valve actuation devices. However, a more powerful and effcient actuator design is needed for this technology to be applied in mass production engines. This paper presents the effects of design and operating parameters on the static and dynamic performances of the actuator. Employing the finite element method (FEM), the flow pattern of the magnetic flux is analysed and the resultant magnetic forces of several cases of core and armature designs are calculated. A computer simulation model has been set up to identify the dynamic behaviour of the EMV system. The effects of external disturbances such as cylinder pressure, armature neutral position and current supply time are also analysed. To verify the accuracy of the simulation model, an experimental study is also carried out on a prototype actuator. It is found that there is relatively good agreement between the experimental data and the results from the simulation model. The newly designed actuator is successfully operated on the test bench up to about 6000 r/min, which is the range of rated speed of most production SI engines. Through the whole speed range, the actuator maintains good performance in valve timing and event control.

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