Patent ID: 7804386

Claim:
A motor vehicle engine valve assembly comprising a valve connected to an electromagnetic control device for the opening and closing of the valve, wherein the control device comprises: an actuation plate containing a magnetic material and controlling the position of the valve between an open position of the valve and a closed position of the valve, at least one coil actuating the plate, the positioning of the valve in at least one of the open and closed positions being obtained by the action of the at least one coil a first and a second gap of variable thickness, wherein the thickness of each of said first and second gaps varies between a maximum thickness in a maximal opening position of said plate and a zero thickness in a closing position of said plate, and wherein said first and second gaps are closed by the plate upon the positioning of the valve in the closed position, a third and a fourth gap of variable thickness, wherein the thickness of each of said third and fourth gaps varies between a maximum thickness in the closing position of said plate and a zero thickness in the maximal opening position of said plate, and wherein said third and fourth gaps are closed by the plate upon the positioning of the valve in the open position, the plate being mounted to rotate such that the axis of rotation of the plate passes between the first, second, third and fourth gaps, wherein a main magnetic flux generated by the coil passes through the plate by being channeled across at least one of the first and second gaps of variable thickness during the whole rotation travel of the plate from the maximal opening position of the plate to the closing position of the plate, and a single permanent magnet which polarises the device so as to hold the plate in each of the maximal opening position of said plate and the closing position of said plate in the absence of current in the coil, wherein a magnetic circuit of the magnetic flux generated by the coil does not contain the permanent magnet.