Vehicle alternator control device and method
AssigneeDenso Corporation
InventorsMakoto Taniguchi, Toshiyo Ogino, Koji Tanaka
Life of this patent
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Abstract
A vehicle alternator control device has a power transistor, a flywheel diode, a voltage control circuit, a primary power supply circuit, and a secondary power supply circuit. When the alternator starts rotation, the secondary power supply circuit drives the primary power supply circuit when the alternator speed reaches a frequency equivalent to a speed higher than an engine idling speed. When the engine stops and the speed of the alternator drops, the secondary power supply circuit stops the primary power supply circuit when the alternator speed reaches a frequency equivalent to a speed below the engine idling speed.
Claims9
A vehicle alternator control device comprising:
- voltage control means for controlling an output voltage of a vehicle alternator by turning on and off a first switching means connected in series with a field coil of the alternator;
- and
- power supply means for supplying the operating voltage of the voltage control means;
- and
- power supply control means for starting an operating voltage generating operation of the power supply means when a frequency of a phase voltage of an armature coil of the alternator exceeds a first reference frequency, and stopping the operating voltage generating operation of the power supply means when the phase voltage frequency drops below a second reference frequency that is lower than the first reference frequency.
A vehicle alternator control method for an alternator having an armature coil and a field coil, and switching means for controlling a field current supply to the field coil thereby to regulate an output voltage of the armature coil, the method comprising steps of:
- detecting a frequency of the output voltage of the armature coil;
- starting the field current supply to the field coil after the detected frequency rises to a first reference frequency;
- and
- stopping the field current supply to the field coil after the detected frequency drops below a second reference frequency which is lower than the first reference frequency.
Dependencies are inferred from the claim text.