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Analysis of advantages and of problems of electromechanical valve actuators (Articolo in rivista)

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Analysis of advantages and of problems of electromechanical valve actuators (Articolo in rivista) (literal)

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Alternative label

Veniero Giglio; Biagio Iorio; Giuseppe Police; Alessandro di Gaeta (2003)
Analysis of advantages and of problems of electromechanical valve actuators
in SAE Transactions Journal of Engines; SAE International, Warrendale (Stati Uniti d'America)
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ISBN 0-7680-1287-2. * Paper was originally published as: \"SAE Technical Papers\", no. 2002-01-1105, ISSN 0148-7191. **Paper was also reprinted for: \"Variable Valve Actuation 2002\", SP-1692, SAE International, 2002, ISBN 0-7680-0960-X. (literal)

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Rivista

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The paper is divided into three parts. First, the working principle and design requirements of a fixed lift EVA actuator are examined. Then some details on the electromechanical design are given. Moreover, the effect on efficiency and pollutants of the strategies employed to vary the load is evaluated. Finally, some advantages and problems of this type of actuator are discussed. The calculations were performed by a commercial one-dimensional code (Wave produced by Ricardo). This tool was also used to give inputs to the design of the electromechanical actuator. The electromechanical design of the actuator was carried out with the aid of the code Flux2D produced by Cedrat. This code allows the complete simulation of transients and of the electrical losses of the actuator. The system requirements of performing the first lift at engine start up and catching in normal operation were analyzed. In this way a fairly realistic picture of the main advantages and of the typical problems of Electromechanical Valve Actuators was outlined. The paper refers to an in progress work being carried out at Istituto Motori. The activity aims to study a prototype of an Electromagnetic Valve Actuator to be employed on a DISI engine with reduced CO2 emission. (literal)

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Istituto Motori - CNR; Istituto Motori - CNR; Istituto Motori - CNR; Dipartimento di Informatica e Sistemistica, Università degli Studi Napoli Federico II (literal)

Titolo

Analysis of advantages and of problems of electromechanical valve actuators (literal)

Abstract

The electromechanical devices proposed in technical literature are very flexible. However, their working principle (fixed lift, fixed lifting time and variable valve events) imposes the use of different strategies, such as cylinder or port deactivation to enable work at partial loads. This happens in particular at low loads. The present paper aims to evaluate the effect of the design and of the strategies adopted to vary the load (cylinder or port deactivation etc) on performance and on pollutant formation of a stoichiometric DISI engine. The calculations were performed by a commercial one-dimensional code (Wave produced by Ricardo). This tool was also used to give inputs to the design of the electromechanical actuator. The electromechanical design of the actuator was carried out with the aid of the code Flux2D produced by Cedrat. This code allows the complete simulation of transients and of the electrical losses of the actuator. The system requirements of performing the first lift at engine start up and catching in normal operation were analyzed. In this way a fairly realistic picture of the main advantages and of the typical problems of Electromechanical Valve Actuators was outlined. (literal)

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