Device for controlling a coupling electromagnet for starting an internal combustion engine, in particular for a motor vehicle
First Claim
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1. A device for controlling the speed of a coupling electromagnet operable to cause meshing of a first gear wheel with a second gear wheel by a translation of said first gear wheel comprising:
- detector means operable to generate a signal indicative of the effective speed of translation of the electromagnet on the basis of detected electric parameters of said electromagnet,processor means receiving at its input said signal indicative of said effective speed of translation, and a reference signal indicative of a predetermined reference speed of translation,switch means controlled by said processor means, operable to control the flow of current in said electromagnet,said processor means being configured to control the supply current to said electromagnet in such a way as to render said effective speed of translation substantially equal to said predetermined reference speed, generator means being provided to generate said reference signal indicate of the predetermined reference speed of translation, configured in such a way as to generate a reference signal which gradually increases in time,wherein said detector means comprise an estimator operable to generate a voltage signal indicative of the effective speed of translation of a movable core of said electromagnet,wherein said estimator operates on the basis of said electrical parameters, said electrical parameters comprising the supply voltage of a winding of said electromagnet and a current flowing in said winding, andwherein said estimator is configured in such a way as to detect a kinetic component of said supply voltage, indicative of said effective speed of translation.
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Abstract
A control device for a coupling electromagnet in particular for a starter motor for a motor vehicle, operable to regulate the speed of engagement of the pinion of the ring gear in such a way as to avoid stresses wear and noise due to excessive speed of engagement in the initial phase of the starting operation. The device operates in a closed loop with a feedback signal generated by an estimator.
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Citations
19 Claims
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1. A device for controlling the speed of a coupling electromagnet operable to cause meshing of a first gear wheel with a second gear wheel by a translation of said first gear wheel comprising:
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detector means operable to generate a signal indicative of the effective speed of translation of the electromagnet on the basis of detected electric parameters of said electromagnet, processor means receiving at its input said signal indicative of said effective speed of translation, and a reference signal indicative of a predetermined reference speed of translation, switch means controlled by said processor means, operable to control the flow of current in said electromagnet, said processor means being configured to control the supply current to said electromagnet in such a way as to render said effective speed of translation substantially equal to said predetermined reference speed, generator means being provided to generate said reference signal indicate of the predetermined reference speed of translation, configured in such a way as to generate a reference signal which gradually increases in time, wherein said detector means comprise an estimator operable to generate a voltage signal indicative of the effective speed of translation of a movable core of said electromagnet, wherein said estimator operates on the basis of said electrical parameters, said electrical parameters comprising the supply voltage of a winding of said electromagnet and a current flowing in said winding, and wherein said estimator is configured in such a way as to detect a kinetic component of said supply voltage, indicative of said effective speed of translation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification