Patent ID: 6340007
Filing Date: 2002-01-22
Classification: F01L

Abstract:
A method for estimating the end-of-stroke positions of moving members of electromagnetic actuators for the actuation of intake and exhaust valves in internal combustion engines, in which an actuator (1) is coupled to a respective intake or exhaust valve (2) and comprises a moving member (3) actuated magnetically in order to control the movement of the valve (2), a sensor (11) supplying a position signal (VZ) representative of a current position (Z) of this moving member (3) and a first and a second electromagnet (6a, 6b) disposed on opposite sides of this moving member (3), wherein this moving member (3) can move between a first end-of-stroke position (ZSUP) in which it is disposed in contact with the first electromagnet (6a) and a second end-of-stroke position (ZINF) in which it is disposed in contact with the second electromagnet (6b), which method is characterised in that it comprises the stages of:a) checking whether a condition of stationary contact of the moving member (3) exists (110, 120); and b) determining a value (ZM) correlated with this current position (Z) (130, 140), if the condition of stationary contact is verified.