Abstract
In this paper, an electromagnetic variable valve train with a magnetorheological buffer (EMVT with MR buffer) is proposed. This system is mainly composed of an electromagnetic linear actuator (EMLA) and a magnetorheological buffer (MR buffer). The valves of an internal combustion engine are driven by the EMLA directly to open and close, which can adjust the valve lift and phase angle of the engine. At the same time, MR buffer can reduce the seat velocity of the valve and realize the seat buffer of the electromagnetic variable valve. In this paper, the overall design scheme of the system is proposed and the structure design, finite element simulation of the EMLA, and the MR buffer are carried out. The electromagnetic force characteristics of the EMLA and buffer force of the MR buffer are measured, and the seat buffering performance is verified as well. Experiments and simulation results show that the electromagnetic force of the EMLA can reach 320.3 N when the maximum coil current is 40 A. When the current of the buffer coil is 2.5 A and the piston’s motion frequency is 5 Hz, the buffering force can reach 35 N. At the same time, a soft landing can be realized when the valve is seated.
Highlights
With global environmental issues being increasingly serious, the development of internal combustion engines is mainly focused on hybrid electric vehicles, electric vehicles, and alternative fuel vehicles
The main feature of the system is that a buffer is set between the electromagnetic linear actuator (EMLA) and the valve, which can change the cushioning force according to the valve seat velocity, and the damping coefficient of the system is adjusted in real-time by the MR buffer in actual operation
When the position of the coil changes, current intensity in the coil is 40 A, the maximum electromagnetic force that the EMLA can achieve the magnitude of the electromagnetic force fluctuates about 23 N, about 7% of the electromagnetic is 320.3 N
Summary
With global environmental issues being increasingly serious, the development of internal combustion engines is mainly focused on hybrid electric vehicles, electric vehicles, and alternative fuel vehicles. Added a mechanical buffer between the electromagnetic linear actuator and the valve to reduce the valve velocity and system energy consumption. The main feature of the system is that a buffer is set between the EMLA and the valve, which can change the cushioning force according to the valve seat velocity, and the damping coefficient of the system is adjusted in real-time by the MR buffer in actual operation. According to the above description, the valve opening lift and phase angle of an internal combustion engine can be adjusted by using EMVT instead of the traditional cam mechanism. The valve state can be changed in real time according to the operating conditions of the internal combustion engine, so that the internal combustion engine can achieve the best power output and fuel consumption under all operating conditions This is obvious for the preservation of internal combustion energy
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