Method for controlling an actuator, using a retaining mark space ratio
AssigneeSiemens Aktiengesellshaft
InventorFranz Kunz
Life of this patent
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Abstract
The invention relates to a method for controlling an actuator which can be displaced between two end positions, said actuator being impinged in one end position and being capable of displacement to the other end position by an electromagnetic part. The actuator is first supplied with an electromagnetic current using a pulse-duration modulation in a retaining mark space ratio. Once the application of current has ended, an oversaturation of the electromagnet is taken into consideration, either by influencing the application of current in the mark space ratio in an appropriate manner, or the oversaturation is completely prevented by a suitable configuration of the application of current.
Claims8
A method for controlling an actuator which is moveable between two end positions, is acted on in one end position and can be moved toward the other end position by an electromagnetic part, in which method
- a) the actuator is held in a desired position between the end positions by energizing the electromagnetic part with a pulse width modulation in a holding duty ratio,
- b) in order to alter the position of the actuator toward the other end position, the electromagnetic part is permanently energized for a specific time duration dependent on the change in position, and
- c) after the end of the specific time duration, the energization with a holding duty ratio commences in a delayed manner and, in between, the electromagnetic part is not energized.
A method for controlling an actuator which is moveable between two end positions, is acted on in one end position and can be moved toward the other end position by an electromagnetic part, the electro-magnetic part being energized in a pulsed-width-modulated manner in a fundamental frequency, in which method
- a) the actuator is held in a desired position between the end positions by energizing the electromagnetic part with a pulse width modulation in a holding duty ratio,
- b) in order to alter the position of the actuator toward the other end position, the electromagnetic part is energized with a frequency above the fundamental frequency for a specific time duration dependent on the change in position.
A method for controlling an actuator which is moveable between two end positions, is acted on in one end position and can be moved toward the other end position by an electromagnetic part, in which method
- a) the actuator is held in a desired position between the end positions by energizing the electromagnetic part with a pulse width modulation in a holding duty ratio,
- b) in order to alter the position of the actuator toward the other end position, the electromagnetic part is permanently energized for a specific time duration dependent on the change in position, in which case
- c) the energizing in step b) is begun at the level of the pulse width modulation of the holding duty ratio that is opposite to the energization and/or is continued after the energization with the level of the pulse width modulation of the holding duty ratio that is opposite to the energization.
The method as claimed in one of the preceding claims,
- characterized in that the actuator is an adjusting mechanism for a gas-exchange-valve-actuating camshaft of an internal combustion engine, which is moved between the end positions by fluid pressure, the electromagnetic part being a valve which controls the fluid pressure.
Dependencies are inferred from the claim text.