摘要:
An electromagnetically driven valve (10) includes a drive valve (14) that is provided with a stem (12) serving as a valve stem and that reciprocates in a direction in which the stem (12) extends; a lower disk (21) serving as a first oscillating member and an upper disk (31) serving as a second oscillating member, each of which can oscillate by using a predetermined point in a disk base (51) as a supporting point, each of which is movably connected to the stem (12) at a first end (22, 32) and is movably supported by the disk base (51) at a second end (23, 33), and which are provided at a predetermined distance from each other; an electromagnet (60) which includes an open/close coil (62), and which is provided between the lower disk (21) and the upper disk (31); and a detector coil (501) which detects a position of at least one of the drive valve (14), the lower disk (21), and the upper disk (31). The electromagnetic force is applied to the lower disk (21) and the upper disk (31) when an electric current passes through the open/close coil (62). An amount of electric current that passes through the open/close coil (62) is determined based on the position of the drive valve (14) detected by the detector coil (501).
摘要:
Die Erfindung geht aus von einer Vorrichtung zur Betätigung mindestens eines Gaswechselventils einer Brennkraftmaschine, umfassend mindestens einen Schwenkanker, der mit dem Gaswechselventil in Wirkverbindung steht, sowie mindestens eine erste und mindestens eine zweite elektromagnetische Einheit, welche zur Betätigung des Schwenkankers dienen. Es wird vorgeschlagen, daß der Schwenkanker einer ersten Funktionsgruppe mit einem Ankergehäuse zugeordnet ist, das über Verbindungsmittel zumindest mit einer zweiten Funktionsgruppe verbunden ist, welcher eine der beiden elektromagnetischen Einheiten zugeordnet ist.
摘要:
Method for estimating the magnetisation curve (C) of an electromagnetic actuator (1) for controlling an engine valve (2), according to which a solenoid (8) is activated by a current (i) determined in order to attract an actuator body (4) and place the actuator body (4) in contact with the solenoid (8); the current (i) is gradually reduced until the actuator body (4) detaches from the solenoid (8) and the corresponding values assumed by the magnetic flow (φ) crossing a magnetic circuit (18) consisting of the solenoid (8) and the actuator body (4) are determined for at least some of the current (i) values.
摘要:
A control method for an electromagnetic actuator (1) for the control of an engine valve (2) in which at least one electromagnet (8) displaces an actuator body (4) under the action of the force of magnetic attraction generated by the electromagnet (8), the electrical supply (i, v) of the electromagnet (8) being controlled as a function of an objective value (φ c ) of the magnetic flux (φ) circulating in the magnetic circuit (18) formed by the electromagnet (8) and the actuator body (4).
摘要:
A method of estimating the effect of the parasitic currents (i par ) in an electromagnetic actuator (1) for the control of an engine valve (2), the parasitic currents (i par ) being modelled by means of an equivalent parasitic current (i p ) which circulates in an equivalent turn (p) which is short-circuited and magnetically coupled to a magnetic circuit (18) formed by an electromagnet (8) and an actuator body (4) and the value of the equivalent parasitic current (i p ) being estimated by resolving the differential equation obtained by applying the generalised Ohm's law to the equivalent turn (p).
摘要:
A method and device for estimating magnetic flux (ϕ) in an electromagnetic actuator (1) for controlling an engine valve (2), whereby the actuating body (4), made at least partly of ferromagnetic material, is moved towards at least one electromagnet (8) by the force of magnetic attraction generated by the electromagnet (8); and the value of the magnetic flux (ϕ) through a magnetic circuit (18) defined by the electromagnet (8) and by the actuating body (4) is estimated by measuring the values assumed by various electric quantities (i, v; v a ) of an electric circuit (17; 22) connected to the magnetic circuit (18), calculating the time derivative of the magnetic flux (ϕ) as a linear combination of the values of the electric quantities (i, v; v a ), and integrating in time the derivative of the magnetic flux (ϕ).