Valve seating control for an electromagnetic fully variable valve train
摘要
The electromagnetic fully variable valve is considered a technological solution for improving engine performance, emissions, and fuel efficiency. This paper proposed a new type of electromagnetic fully variable valve train, which can enable better engine performance and also improve the valve soft landing performance. In order to realize the control objectives and system coordination in different stages of electromagnetic fully variable valve train, a sectional control strategy was proposed. The valve motion control process is divided into transition process and seating process, and the 10 % of stroke is taken as the switching point in this paper. The inverse system control method was used in the valve transition process, and a double-layer controller was used in the valve seating process. The external controller is a linear quadratic controller, and the multi-state control algorithm of the internal controller was designed in the inner controller because it is difficult to achieve continuous control of the magnetorheological buffer. The results show that this method can keep the valve transition time within 4 ms and can effectively suppress the valve seating velocity in experimental conditions.