Modelling and validation of a fast switching valve intended for combustion engine valve trains

Abstract

In recent years much research has been done in the area of variable-valve actuation in order to improve the eYciency of combustion engines. Currently, a number of diVerent concepts for variable-valve actuation are under development or at a prototype stage. Hydraulic actuation has been an obvious candidate, but the lack of suYciently fast switching valves with appropriate owrates has been the major shortcoming. Design of such highly dynamic systems requires accurate models of the actual included components.In this paper a model of a fast 2/2 switching valve is presented, where both the magnetic path as well as the spool assembly are modelled. The model presented here is primarily aimed at system simulations; therefore it has to be kept simple with the number of parameters low.Some of the parameters are often hard to obtain, especially when it comes to magnetic material properties. In this study, an optimization strategy has been utilized in order to parameterize the model against measured data. However, even for major deviations from the operational point used for the model adaptation, the model predicts the valve response suYciently accurately.

Tracking control for a hydraulic drive with a pressure compensator

“…В то же время нелинейные модели гидрораспределителя, в основном, представлены в работах, по-священных моделированию гидросистем, к примеру [9][10][11][12]. В [13] представлена сложная нелинейная модель тяжелой гидрофицированной машины с электрогидравлическим краном-манипулятором, однако управление с прямыми связями в этой работе используется только для проверки модели.…”

Position control of an industrial hydraulic system with a pressure compensator

“…Nonlinear models of a valve are generally presented in modeling and simulation papers, see [15], [16], [17]; also a Fig. 1: The scheme of a single-ended hydraulic cylinder with a double-acting valve.…”

Nonlinear Dynamic Model-Based Adaptive Control of a Solenoid-Valve System

“…Hydrodynamic torque of a butterfly valve comprises the core knowledge of fluid valve system design [5], and it is known that most of the valves in real systems have strongly nonlinear characteristics between the force and displacement [6,7]. The use of an intelligent approach [8,9] such as adaptive, robust, optimal, or nonlinear control of the actuator-valve machinery systems will benefit a wide spectrum of nonlinear systems, compensating for nonlinearities [10] and dynamic characteristics. This approach will not only decrease the amount of cost and casualties but also improve the performance of the mechatronic system.…”