Control device and control method for a vehicle AC generator
First Claim
1. A control device for a vehicle AC generator, the control device comprising:
- a power transistor for controlling conduction/non-conduction of a field coil in accordance with an output voltage of an AC generator mounted on a vehicle;
an RPM detection section for detecting an RPM of the AC generator;
a drive duty setting section for determining whether or not the RPM detected by the RPM detection section is equal to or higher than a predetermined threshold, and reducing a conduction ratio of the field coil when determining that the RPM is equal to or higher than the predetermined threshold; and
a driver for driving the power transistor based on the conduction ratio of the field coil output from the drive duty setting section.
1 Assignment
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Accused Products
Abstract
The control device including: a power transistor (502) for controlling conduction/non-conduction of a field coil (3) in accordance with an output voltage of an AC generator (1) mounted on a vehicle; an RPM detection section (511) for detecting an RPM of the AC generator (1); a drive duty setting section (510) for determining whether or not the RPM detected by the RPM detection section (511) is equal to or higher than a predetermined threshold, and reducing a conduction ratio of the field coil (3) when determining that the RPM is equal to or higher than the predetermined threshold; and a driver (504) for driving the power transistor (502) based on the conduction ratio. In this manner, the conduction ratio of the field coil (3) is reduced to suppress the drive torque.
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Citations
6 Claims
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1. A control device for a vehicle AC generator, the control device comprising:
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a power transistor for controlling conduction/non-conduction of a field coil in accordance with an output voltage of an AC generator mounted on a vehicle; an RPM detection section for detecting an RPM of the AC generator; a drive duty setting section for determining whether or not the RPM detected by the RPM detection section is equal to or higher than a predetermined threshold, and reducing a conduction ratio of the field coil when determining that the RPM is equal to or higher than the predetermined threshold; and a driver for driving the power transistor based on the conduction ratio of the field coil output from the drive duty setting section. - View Dependent Claims (2, 3, 4, 5)
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6. A control method for a vehicle AC generator, comprising:
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an RPM detection step of detecting an RPM of an AC generator mounted on a vehicle; a determination step of determining whether or not the RPM detected in the RPM detection step is equal to or higher than a predetermined threshold; a conduction ratio setting step of reducing a conduction ratio of a field coil when it is determined in the determination step that the RPM is equal to or higher than the predetermined threshold; and a step of controlling conduction/non-conduction of the field coil based on the conduction ratio set in the conduction ratio setting step.
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Specification