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As the constraint on vehicle consumption tightens, variable valve lift strategies are used to increase engines efficiency. This thesis focuses on issues related to the design of a three-stage electromagnetic valve tappet. First of all, the tappet has to fit inside the engine and has to offer three different valve lifts: a full lift for high speed a...
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In this article, a new fatigue life analysis method based on six sigma robust optimization is proposed, which considers the random effects of material properties, external loads, and dimensions on the fatigue life of a pantograph collector head support. Some main random factors are identified through fatigue reliability sensitivity analysis, which...
Citations
... A typical lift profile for the mechanical valve train system is presented in Fig. 2 . [11] . ...
... Example of electromagnetic actuators, passive types[11] . ...
The increase of the effective efficiency of the internal combustion engines is important for the fuel consumption reduction and the CO2 emission reduction. The variable engine valve trains are important for the gas exchanges and influence directly the effective efficiency of the internal combustion engine. With the increased electrifications of the vehicles, variable valve train based on electricity driven actuators presents interest for investigation for gasoline engines for vehicular application.
This article presents an innovative application of an electromagnetic actuator for a future variable engine valve train. The actuators are designed for small gasoline engine. The design of a high performing and dynamic electromechanical system leads to a nonlinear behavior of the actuator. The nonlinearities that have to be faced come from the magnetic laws and the mechanical friction. In the final control strategy, it is proposed to compensate them both with nonlinear feedforward actions and with a linear robust feedback controller, which is able to reject all what cannot be predicted. An experimental test bench is built for the correlation of the control model with experimental measures. Control strategies are developed and the performance indicators of the actuators are evaluated. The robust controller method uses CRONE system control methodology. The investigations show that very good dynamic performances of the controller are obtained.
... A typical lift profile for the mechanical valve train system is presented in Fig. 2 . [11] . ...
... Example of electromagnetic actuators, passive types[11] . ...
This paper presents an innovative application of an electromagnetic actuator for a future camless engine valvetrain. The actuators are designed for small gasoline engine. The design method is inversed to create a control-oriented model. The control architecture is designed for a robust control of the actuator. An experimental test bench is built for the correlation of the control model with experimental measures. Control strategies are developed and the performance indicators of the actuators are evaluated. The robust controller method uses CRONE system design methodology. The investigations show that the design of the innovative actuator and of its controller provide very good dynamic performances.
