Generation-stop detection system of alternator
First Claim
1. A system for detecting when an alternator stops generating, said alternator having a rotor and a field coil, said system comprising:
- a reference level setting unit for providing a reference voltage level, said reference voltage level being lower than a normal output voltage of said alternator and higher than the output voltage of said alternator generated when said field coil is not excited;
a condition detection unit providing a generation-stop condition signal when the output voltage of said alternator becomes lower than said reference level;
a speed detection unit detecting a rotation speed of said alternator; and
a correction unit for correcting said generation-stop condition signal according to said rotation speed of said alternator.
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Accused Products
Abstract
A generation-stop detection system of an alternator is provided. A unit provides a generation-stop condition signal when an output voltage of the alternator is lower than a reference voltage. A rotation speed detection unit detects a rotation speed. A reference voltage changing unit changes the reference voltage proportionally to the rotation speed of the alternator. A warning signal unit provides a warning signal if the generation-stop condition signal is provided at a rotation speed lower than a predetermined speed. The warning signal is maintained even when the rotation speed of the alternator becomes higher than the predetermined speed. The warning signal is interrupted when the output voltage of the alternator is higher than the voltage of the battery.
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Citations
71 Claims
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1. A system for detecting when an alternator stops generating, said alternator having a rotor and a field coil, said system comprising:
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a reference level setting unit for providing a reference voltage level, said reference voltage level being lower than a normal output voltage of said alternator and higher than the output voltage of said alternator generated when said field coil is not excited; a condition detection unit providing a generation-stop condition signal when the output voltage of said alternator becomes lower than said reference level; a speed detection unit detecting a rotation speed of said alternator; and a correction unit for correcting said generation-stop condition signal according to said rotation speed of said alternator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A system for detecting when an alternator stops generating, said alternator charging a vehicle battery by supplying field current to a field coil, said system comprising:
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first means for providing a generation-stop condition signal when an output voltage of said alternator is lower than a reference voltage; second means for detecting a rotation speed of said alternator; third means for changing said reference voltage proportionally to the rotation speed of said alternator; fourth means for providing a warning signal if said generation-stop condition signal is provided at a rotation speed lower than a predetermined speed; and fifth means for maintaining said warning signal even when the rotation speed of said alternator becomes higher than said predetermined speed. - View Dependent Claims (16, 17)
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18. A system for detecting when an alternator stops generating, said alternator charging a vehicle battery by supplying a field current to a field coil, said system comprising:
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first means for detecting a rotation speed of said alternator; a reference signal generating circuit connected to said alternator and said first means, said reference signal generating circuit generating a reference signal having a voltage increasing as the rotational speed of said alternator increases, said reference signal generating circuit comprising a counter providing numbers corresponding to said rotation speed; a generation-stop signal circuit providing a generation-stop signal when an output voltage of said alternator is lower than said reference voltage; and second means for providing a warning signal if said generation-stop condition is provided at a rotation speed lower than a predetermined speed. - View Dependent Claims (19, 20, 21)
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22. A system for detecting when an alternator stops generating, said alternator comprising a rotor and a field coil, said system comprising:
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a generation condition detection unit providing a generation-stop condition signal when signals respectively indicating a generation voltage of said generator and a reference level are compared and said generation voltage is found to be lower than said reference level; a speed detection unit detecting a rotation speed of said alternator; and a correction unit for correcting said signals according to said rotation speed to prevent an undesired stoppage of said generation-stop condition signal due to an increase in said generation voltage not caused by an increase in electric current supplied to said field coil and caused by an increase in said rotation speed. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A system for detecting when an alternator stops generating, said alternator having a rotor including a field coil and a permanent magnet, said system comprising:
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a generation condition detection unit providing a generation-stop condition signal when an output voltage of said alternator becomes lower than a reference voltage level; a speed detection unit detecting a rotation speed of said alternator; and a correction unit for changing said reference voltage level according to said rotation speed so that said reference voltage level is always lower than said output voltage while said alternator is in a normal condition and so that said reference voltage level is always higher than said output voltage when said field coil is not excited. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. A system for detecting when an alternator stops generating, said alternator comprising a stator including a stator winding and a rotor including a field coil and a permanent magnet, said system comprising:
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means for providing a generation-stop signal when an output voltage of said stator winding becomes lower than a reference voltage level; means for detecting a rotation speed of said alternator; and means for changing said reference voltage level according to said rotation speed so that said reference voltage level is always lower than said output voltage when said alternator is in a normal condition and so that said reference voltage level is always higher than said output voltage generated when said field coil is not excited. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. A system for detecting when an alternator stops generating, said alternator comprising a stator including an output winding and a rotor including a field coil and a permanent magnet, said system comprising:
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first means for providing a reference voltage level which is lower than a normal output voltage of said output winding and higher than an output of said output winding generated when said field coil is not energized in a predetermined speed range; second means for providing a generation-stop signal when the output voltage of said alternator becomes lower than said reference voltage level; and third means for thereafter maintaining said generation-stop signal when said output voltage of said alternator becomes higher than said reference voltage. - View Dependent Claims (61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71)
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Specification