Abstract: A control apparatus of electromagnetic valve includes a valve body functioning as an intake valve or an exhaust valve of an internal combustion engine and an electromagnet for affecting an electromagnetic force relative to an armature provided on the valve body for actuating the valve body. The control apparatus of the electromagnetic valve further includes a controller for determining a target value regarding a force affecting the valve body when displacing the valve body from one displacement end to the other displacement end or a state quantity of the valve body varied in accordance with the force and for controlling the electromagnetic force of the electromagnet for attracting the armature to the one displacement side based on a deviation between the force or the state quantity and the target value so that the force or the state quantity conforms to the determined target value when displacing the valve body from the one displacement end to the other displacement end.

Abstract: A drive control apparatus and a control method are provided for controlling driving of an engine valve of an internal combustion engine, utilizing an electromagnetic force generated by an electromagnet or electromagnets. A magnitude of an external force applied to the engine valve is estimated, and a target operating state of the engine valve is set in view of the estimated magnitude of the external force. Then, a current applied to the electromagnet(s) is controlled in accordance with an actual operating state and the target operating state of the engine valve, so that the actual operating state substantially coincides with the target operating state.

Abstract: A drive control apparatus and method control driving of an engine valve of an internal combustion engine based on electromagnetic force generated by a certain electromagnet. A controller of the apparatus sets a target drive velocity in accordance with a displacement of the engine valve, such that the target drive velocity corresponds to a velocity of the engine valve when there is no engine load. The controller then controls a magnitude of the electromagnetic force by controlling current applied to the electromagnet, depending upon a degree of separation between an actual drive velocity of the engine valve and the target drive velocity, so that the actual drive velocity is made substantially equal to the target drive velocity.

Abstract: A drive control apparatus and method control driving of an engine valve of an internal combustion engine based on electromagnetic force generated by a certain electromagnet. A controller of the apparatus sets a target drive velocity in accordance with a displacement of the engine valve, such that the target drive velocity corresponds to a velocity of the engine valve when there is no engine load. The controller then controls a magnitude of the electromagnetic force by controlling current applied to the electromagnet, depending upon a degree of separation between an actual drive velocity of the engine valve and the target drive velocity, so that the actual drive velocity is made substantially equal to the target drive velocity.

Abstract: A solenoid valve actuating apparatus wherein an actuating circuit for controlling exciting currents to electromagnets for actuating a plurality of engine valves so that the engine valves will be opened and closed can be formed by a small number of switching means is provided. Two of the engine valves form one engine valve group, and the actuating circuit is provided for each of the engine valve groups. The actuating circuit includes three series circuits each having three switching means connected in series between a first line terminal on a high voltage side and a second line terminal on a low voltage side. Four of the electromagnets each corresponding to each of the engine valve groups connect connecting-in-series portions between the switching means between different series circuits.

Abstract: The present invention relates to an electromagnetically driven valve suited for use in an internal combustion engine and aims at achieving appropriate operating characteristics in accordance with operating conditions of the internal combustion engine at the time of opening or closing a valve body. An armature moving together with the valve body is provided and upper and lower cores are disposed on opposed sides of the armature. The upper core and the lower core accommodate upper and lower coils, respectively. An annular protrusion, formed not on the upper core but on the lower core only, has an inner diameter slightly larger than an outer diameter of the armature.

Abstract: The present invention relates to an electromagnetically driven valve suited for use in an internal combustion engine and aims at achieving appropriate operating characteristics in accordance with operating conditions of the internal combustion engine at the time of opening or closing a valve body. An armature moving together with the valve body is provided and upper and lower cores are disposed on opposed sides of the armature. The upper core and the lower core accommodate upper and lower coils, respectively. An annular protrusion, formed not on the upper core but on the lower core only, has an inner diameter slightly larger than an outer diameter of the armature.

Abstract: A control apparatus for a valve of an internal combustion engine electrically opens and closes an intake or exhaust valve of the internal combustion engine with reduced power consumption while securing stable operating characteristics. The electromagnetically driven valve is opened and closed by combining an electromagnetic force produced by upper and lower electromagnets and an elastic force produced by upper and lower springs. At a timing at which one of the upper and lower electromagnets is to attract the valve, a predetermined attracting current is supplied to the respective one of the upper and lower electromagnets, and it is detected whether there is a step out of the valve. If a step out is detected, the attracting current applied to the respective one of the upper and lower electromagnets in the next cycle is increased. If the step out is not detected, the attracting current used in the next cycle is decreased.