The analysis of dynamics for actuator - valve assembly in camless engine

• Autorzy: Siczek K.
• Języki publikacji: EN

Abstrakty

EN

Nowadays camless inner combustion engines have become an interesting alternative for classic engines with valve timing included the camshafts. The operating conditions for such valve timing differ from analogous conditions for classic valve timing. Some of manufactures provide intensive research on different prototypes of camless engine, i.e. BMW, Valeo. The academic institutions have researched such camless engine either. There are different solutions for actuators of valves in camless engine. They could be electromagnetic, electrohydraulic or even electropneumatic actuators. One of the important problems in such valve timing is controlling of valve actuators. The actuators are controlled by electronic system, which use the signal of actual position of valve from i.e. hallotronic sensors to control the currents in actuator coils. It is critical to know relation between the actual position of valve and the actual position of coil for proper controlling values of current in coil. Values of the electrodynamic forces generated in the actuator are practically linearly proportional to current values in actuator coil. These forces decide of dynamic parameters of valve motion. One of the prototypes of camless engine have been investigated by K. Zbierski in Technical University of Lodz in Poland. The assembly of electromagnetic actuator and valve, used in the mentioned prototype, has been the research object, which has been analysed in this paper. The influence of modification of material for the coil form in actuator upon dynamic parameters, such as: displacement, velocity and acceleration, for elements of assembly has been analysed. The influence of such modification upon stresses and strains in the coil form has been analysed, either. The calculations have been made using the model elaborated with Finite Element Method. The obtained results have shown that influence of elasticity of assembly elements upon relative displacement, velocity and acceleration of valve and coil can be very important for control algorithm for actuator — valve assembly. The resulted stress and strain gradients and the courses of dynamic parameters have been presented in the paper.

Słowa kluczowe

EN

camless combustion engine; valve timing; electromagnetic actuator; dynamic parameters; stress; strain

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2008
• Tom: Vol. 15, No. 4
• Strony: 501--508
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Siczek K.

• Technical University of Lodz Chair of Precise Design Stefanowskiego Street 1/15, 94-924 Lodz, Poland tel:. [phone], fax:[phone],

Bibliografia

• [1] Zbierski, K., Bezkrzywkowy magnetoelektryczny rozrząd czterosuwowego silnika spalinowego, Monografie Politechniki Łódzkiej, Wydawnictwo Politechniki Łódzkiej, Łódź 2007.
• [2] Tai, C., Tsao, T. C., Control of an electromechanical camless valve actuator, Proceedings of the American Control Conference, Anchorage, May 2002.
• [3] Zbierski, K., Siczek, K., Calculation and veryfication of forces driving outlet valves in magnetoelectrical valve timing of combustion engine, Journal of KONES, 2006, Vol. 13, No. 3, pp. 455-462.
• [4] ANSYS v.11.0 Documentation.
• [5] http://www.tekstolit.com/kontakt/index.html.