Abstract:
An electromechanical actuator comprises at least one electromagnet with a coil and an armature with an armature plate which can be displaced between a first contact surface on the electromagnet and a second contact surface. The position (s) of the armature is determined in accordance with the magnetic flow ( PHI ) and current (Is) flowing through the coil.
Abstract:
A method of controlling velocity of an armature of an electromagnetic actuator as the armature moves from a first position towards a second position is provided. The electromagnetic actuator includes a coil and a core at the second position. The coil generates a magnetic force to cause the armature to move towards and land at the second position. A control method is provided to ensure a near zero velocity landing of the armature in the second position while compensating for non-ideal external influences on the system.
Abstract:
The invention relates to a regulator comprising a gas shuttle valve and an electromagnetic actuator (11) including at least one electromagnet having a coil (113), in addition to an armature whose plate (116) can move between a first bearing surface (115a) on the electromagnet and a second bearing surface (115b). A device for controlling the regulator comprises an output stage (32) designed to control the coil (113). The output stage (32) has an electric energy storage that is charged by the coil (113) in a predetermined operating state. The control unit (31) controls the output stage (32) in a rapid current (SB) operating mode (BZ1) when a given condition is met indicating the presence of the armature plate (116) on the first bearing surface (115a) or the imminent fall back of the armature plate (116) to a rest position (R), wherein the energy stored in the electric energy storage is fed to the coil (113) in the rapid current (SB) operating mode (BZ1).
Abstract:
In order to ensure continuously variable control of cam spread in an internal-combustion engine, the invention calls for the instantaneous position of the camshaft (measured value) to be determined by a sensor. Subsequently, the target value is determined from a characteristic curve stored in a computer, as well as the direction of the necessary adjustment. Depending on the size of the difference between the measured and target values, an actuator element is actuated with a variable duty cycle, the sensing being executed with a fixed time pattern. The actuator is subsequently actuated for a given length of time with a neutral value in order to permit the current camshaft position to be analysed, and the procedure for the determination of the difference is then started again from the beginning.
Abstract:
A control system (140) for an internal combustion engine (100) having a plurality of cylinders (C1-Cn) and a rotatable crankshaft (110). Each cylinder (C1-Cn) has an electronically actuatable intake valve, exhaust valve (120, 125) and fuel injector (130). The control system includes a sensor (155) which monitors the rotation of the crankshaft (110) and responsively produces a crankshaft pulsetrain. A computer (216) produces operator parameter signals. The operator parameter signals including one of a plurality of operating modes of the engine (100). A first microprocessor (226) receives the crankshaft pulsetrain, responsively determines the speed of the engine (100) and produces a signal representative of the determined engine speed. A second microprocessor (222) receives the operator parameter signals and the engine speed signal, responsively determines valve and injection events for each cylinder (C1-Cn) to responsively achieve the one engine operating mode. The second microprocessor (222) produces signals representative of the determined valve and injection events.
Abstract:
Autocalibration of the camshaft phasing sensor of a closed-loop variable valve timing system of an internal combustion engine. The camshaft phasing adjustment mechanism comprises a cam that changes the camshaft phasing. This cam is provided with a dwell that occurs at a known true phasing of the camshaft. The cam is commanded to operate to the dwell, and the lack of change in the sensor output indicates when the dwell is reached. At this time the sensor output should exactly indicate the known camshaft phasing that is produced by the adjustment cam dwell. If it does not, the difference is calculated and forms an offset that is algebraically applied to the sensor output thereby calibrating the sensor.
Abstract:
Eine Stelleinheit (1) einer Brennkraftmaschine umfasst einen Elektromotor (2) und ein mit diesem zusammenwirkendes Getriebe (11), wobei eine Verstellwelle (6) des Getriebes (11) mit dem Rotor (8) des Elektromotors (2) gekoppelt ist. Eine Abtriebswelle (3) des Getriebes (11) ist mit der zu verstellenden Welle (5) gekoppelt. Zur Ansteuerung des Elektromotors (2) ist eine außerhalb eines den Stator (9) des Elektromotors (2) umschließenden Gehäuses (10) des Elektromotors (2) angeordnete, sensorlose Ansteuereinheit (12) vorgesehen.
Abstract:
A valvetrain for an internal combustion engine of the type that has a combustion chamber, a moveable valve having a seat formed in the combustion chamber, and a camshaft includes a rocker arm assembly, a pivot providing a fulcrum for a rocker arm of the rocker arm assembly, and a latch assembly. An electrical device mounted to the rocker arm assembly receives power or communicates through a circuit that includes an electrical connection formed by abutment between surfaces of two distinct parts. The rocker arm assembly is operative to move one of the two abutting surfaces relative to the other in response to actuation of the cam follower. Forming an electrical connection through abutting surfaces that are free to undergo relative motion may reduce or eliminate the need to run wires to a mobile portion of the rocker arm assembly.
Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Einstellen eines Stellglieds (200) für eine Nockenwelle (201) einer Brennkraftmaschine. Das Stellglied (200) ist derart mit der Nockenwelle (201) gekoppelt, dass eine Nockenwellenstellung einstellbar ist. Gemäß dem Verfahren wird ein Moment bestimmt, welches eine Komponente der Brennkraftmaschine auf die Nockenwelle (201) überträgt, wobei das Moment basierend auf zumindest einem Betriebsparameter der Komponente bestimmt wird. Das Moment wird von der Nockenwelle (201) auf das Stellglied (200) übertragen, so dass das Moment eine Verstellung (202) des Stellglieds (201) und der Nockenwellenstellung verursachen kann. Die Größe der Verstellung (202) ist indikativ zu dem Moment der Komponente. Gemäß dem Verfahren wird ein Verstellers (300) des Stellglieds (200) basierend auf dem Moment derart gesteuert, dass dem Moment entgegengewirkt wird und die Verstellung (202) des Stellglieds (200) und der Nockenwellenstellung unterbunden wird.
Abstract:
A method of controlling idle speed of a reciprocating piston gasoline engine having inlet poppet valves and active tappets therefor. The method allows the volume of inlet air to be varied so that idle speed can be confined within upper and lower limits with efficient combustion. The active tappets may be electro-hydraulic.