ELECTROMAGNETIC ACTUATOR FOR A CAM LESS ENGINE

ELECTRONICS & COMMUNICATION ENGINEERING

Internal combustion engine require cam to open and close inlet and exhaust valve with the help of cam shaft using engine power. At high speed cam have its limitations. Since the valve use power of the engine it reduces the engine break power and its rpm. With the increased electrifications of the vehicles, variable valve train based on electricity driven actuators presents interest for investigation for gasoline engines for vehicular application. Actuators can be used to both open and close valves, or to open valves closed by springs or other means. Camshafts normally have one lobe per valve, with a fixed valve duration and lift. The camshaft rotates at half the rate of the crankshaft. Although many modern engines use camshaft phasing, adjusting the lift and valve duration in a working engine is more difficult. Some manufacturers use systems with more than one cam lobe, but this is still a compromise as only a few profiles can be in operation at once. This is not the case with the cam less engine, where lift and valve timing can be adjusted freely from valve to valve and from cycle to cycle. It also allows multiple lift events per cycle and, indeed, no events per cycle.

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