Electromagnetic system to control the valves of an engine

Abstract

Electromagnetic system to control the valves of an engine and having a control unit and for each valve a respective electromagnetic actuator provided with a pair of electromagnets; each electromagnet has a winding which is provided with a power bobbin and an auxiliary measurement bobbin, and a flexible connection cable, which is directly integrated in the respective winding in order to connect the winding itself to the control unit electrically without further interpositions.

1 . Electromagnetic system to control the valves ( 2 ) of an engine and comprising a control unit ( 11 ) and for each valve ( 2 ) a respective electromagnetic actuator ( 1 ) provided with a pair of electromagnets ( 8 ), with an actuator body ( 4 ), which is connected mechanically to the respective valve ( 2 ) and is fitted such as to be mobile between the two electromagnets ( 8 ) in order to be displaced under the action of the electromagnets ( 8 ) themselves, and with at least one resilient body ( 9 ), which is connected to the actuator body ( 4 ) in order to maintain the actuator body ( 4 ) itself in an intermediate position of rest between the two electromagnets ( 8 ); each electromagnet ( 8 ) comprising a magnetic core ( 12 ), a winding ( 17 ), which is connected to the magnetic core ( 12 ) and is provided with a power bobbin ( 13 ) and an auxiliary measurement bobbin ( 16 ), and a connection cable ( 18 ), which can connect the winding ( 17 ) electrically to the control unit ( 11 ); the electromagnetic system being characterised in that each said electromagnet ( 8 ) comprises a respective flexible connection cable ( 18 ), which is integrated directly in the respective winding ( 17 ) in order to connect the winding ( 17 ) itself to the control unit ( 11 ) electrically without further interpositions:  
     
     
         2 . System according to  claim 1 , wherein each said connection cable ( 18 ) comprises four electrical conductors ( 19 ) inserted in a single isolating sheath ( 21 ) in order to connect both the respective power bobbin ( 13 ) and the respective auxiliary measurement bobbin ( 16 ) electrically to the said control unit ( 11 ).  
     
     
         3 . System according to  claim 2 , wherein the said four electrical conductors ( 19 ) of a single connection cable ( 18 ) are the same electrical conductors as those used for production of the power bobbin ( 13 ) and of the auxiliary bobbin ( 16 ) of the respective winding ( 17 ).  
     
     
         4 . System according to  claim 3 , wherein each said connection cable ( 18 ) comprises further electrical isolations which are accommodated inside the respective sheath ( 21 ).  
     
     
         5 . System according to  claim 1 , and comprising a box-type body ( 20 ) which can accommodate a pair of said electromagnetic actuators ( 1 ) for the control of two respective said valves ( 2 ); the said box-type body ( 20 ) having four through holes for passage of the corresponding said connection cables ( 18 ).  
     
     
         6 . Electromagnetic actuator to control the valve ( 2 ) of an engine; the electromagnetic actuator ( 1 ) comprising a pair of electromagnets ( 8 ), an actuator body ( 4 ), which is connected mechanically to the valve ( 2 ) and is fitted such as to be mobile between the two electromagnets ( 8 ) in order to be displaced under the action of the electromagnets ( 8 ) themselves, and at least one resilient body ( 9 ), which is connected to the actuator body ( 4 ) in order to maintain the actuator body ( 4 ) itself in an intermediate position of rest between the two electromagnets ( 8 ); each electromagnet ( 8 ) comprising a magnetic core ( 12 ), a winding ( 17 ), which is connected to the magnetic core ( 12 ) and is provided with a power bobbin ( 13 ) and an auxiliary measurement bobbin ( 16 ), and a connection cable ( 18 ), which can connect the winding ( 17 ) electrically to the control unit ( 11 ); the electromagnetic actuator ( 1 ) being characterised in that each said electromagnet ( 8 ) comprises a respective flexible connection cable ( 18 ), which is integrated directly in the respective winding ( 17 ) in order to connect the winding ( 17 ) itself electrically to the control unit ( 11 ) without further interpositions.