Patent US5686819A successfully refreshed from Google Patents.
US5686819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus for AC generator of motor vehicle
Assignee: Mitsubishi Electric Corp
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Filing: 1995-12-08
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Granted: 1997-11-11
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Expires: 2015-12-08
Abstract
Abstract A control apparatus for an AC generator of a motor vehicle of high reliability having substantially no adverse influence to an onboard battery and an onboard high-voltage load by suppressing to a passible minimum variation of a regulating voltage which may occur as contacts of a detection voltage change-over switch are degraded. An AC generator of a motor vehicle includes a rectifier circuit for rectifying an output of the AC generator including a field coil, an output change-over switch for changing over an output of the rectifier circuit to either one of a battery and a high-voltage electric load mounted on the motor vehicle, and a voltage regulator for regulating an exciting current supplied to the field coil in dependence on a terminal voltage of the battery as detected on a charging line connected to the battery by way of the output change-over switch upon charging of the battery from the output of the rectifier circuit, to thereby regulate the output voltage of the AC generator.
Inventors
- 👤 Shiro Iwatani
- 👤 Kyoji Matsumura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:34
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/1438
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
168 words
A control apparatus for an AC generator of a motor vehicle, comprising: a rectifier circuit for rectifying an output of said AC generator including a field coil; output change-over means for changing over said output of said rectifier circuit to one of a battery and a high-voltage load mounted on said motor vehicle; voltage regulating means for regulating an exciting current supplied to said field coil in dependence on a terminal voltage of said battery as detected on a charging line connected to said battery by way of said output change-over means upon charging of said battery from the output of said rectifier circuit, to thereby regulate the output voltage of said AC generator; and means for preventing damage to contacts of the change-over means when switching from the battery to the high-voltage load, said damage prevention means comprising: high-voltage control means including time delay means for interrupting the exciting current flowing through the field coil for a brief, predetermined time interval during change-over to said high-voltage load.
Claim 2
Dependent Claim
168 words
A control apparatus for an AC generator of a motor vehicle, comprising: a rectifier circuit for rectifying an output of said AC generator including a field coil; output change-over means for changing over said output of said rectifier circuit to one of a battery and a high-voltage load mounted on said motor vehicle; voltage regulating means for regulating an exciting current supplied to said field coil in dependence on a terminal voltage of said battery as detected on a charging line connected to said battery by way of said output change-over means upon charging of said battery from the output of said rectifier circuit, to thereby regulate the output voltage of said AC generator; and means for preventing damage to contacts of the change-over means when switching from the battery to the high-voltage load, said damage prevention means comprising: high-voltage control means including time delay means for interrupting the exciting current flowing through the field coil for a brief, predetermined time interval during change-over to said high-voltage load.
Claim 3
Dependent Claim
189 words
A control apparatus for an AC generator of a motor vehicle, comprising: a rectifier circuit for rectifying an output of said AC generator including a field coil; output change-over means for changing over said output of said rectifier circuit to one of a battery and a high-voltage load mounted on said motor vehicle; voltage regulating means for regulating an exciting current supplied to said field coil in dependence on a terminal voltage of said battery as detected on a charging line connected to said battery by way of said output change-over means upon charging of said battery from the output of said rectifier circuit, to thereby regulate the output voltage of said AC generator; and high-voltage control means for detecting a terminal voltage of a said high-voltage load upon switching of said output change-over means to said high-voltage load to thereby output a drive signal for controlling operation of said voltage regulating means upon detecting one of said terminal voltage of said high-voltage load below a first reference voltage and said terminal voltage of said high-voltage load above a second reference voltage, wherein said detection constitutes an abnormality detection.
Claim 4
Dependent Claim
189 words
A control apparatus for an AC generator of a motor vehicle, comprising: a rectifier circuit for rectifying an output of said AC generator including a field coil; output change-over means for changing over said output of said rectifier circuit to one of a battery and a high-voltage load mounted on said motor vehicle; voltage regulating means for regulating an exciting current supplied to said field coil in dependence on a terminal voltage of said battery as detected on a charging line connected to said battery by way of said output change-over means upon charging of said battery from the output of said rectifier circuit, to thereby regulate the output voltage of said AC generator; and high-voltage control means for detecting a terminal voltage of a said high-voltage load upon switching of said output change-over means to said high-voltage load to thereby output a drive signal for controlling operation of said voltage regulating means upon detecting one of said terminal voltage of said high-voltage load below a first reference voltage and said terminal voltage of said high-voltage load above a second reference voltage, wherein said detection constitutes an abnormality detection.
Claim 5
Dependent Claim
75 words
A control apparatus for an AC generator of a motor vehicle according to claim 2, wherein said high-voltage control means interrupts the detecting operation of said voltage regulator for detecting the terminal voltage of said battery upon switching of said output change-over means to said high-voltage load and outputs a drive signal for driving/controlling said voltage regulating means in dependence on the result of abnormality detection of the terminal voltage of said abnormality high-voltage load.
Claim 6
Dependent Claim
53 words
A control apparatus for an AC generator of a motor vehicle according to claim 2, wherein said high-voltage control means includes exciting current interrupting means for interrupting temporarily the supply of said exciting current to said field coil from said voltage regulator when said output change-over means are switched to said high-voltage load.
Claim 7
Dependent Claim
49 words
A control apparatus for an AC generator of a motor vehicle according to claim 2, wherein said high-voltage control means includes alarming means for outputting an alarm signal in response to an abnormality detection signal indicating that the output of said AC generator is below a generator reference level.
Claim 8
Dependent Claim
44 words
A control apparatus for an AC generator of a motor vehicle according to claim 5, wherein said abnormality detection signal is derived from an output voltage of said AC generator rectified by a rectifier circuit and outputted from an additional rectifier output terminal thereof.
Claim 9
Dependent Claim
39 words
A control apparatus for an AC generator of a motor vehicle according to claim 5, wherein said abnormality detection signal is derived from a smoothed voltage generated by rectifying and smoothing one phase output voltage of said AC generator.
Claim 10
Dependent Claim
62 words
A control apparatus for an AC generator of a motor vehicle according to claim 6, wherein said abnormality detection signal is applied to an input terminal of the voltage regulator to which a drive signal is inputted through a connecting line extending from said high-voltage control means and at the same time applied to alarming means by way of said connecting line.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-10 | 2001-05-12 | 2001-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-10 | 2005-05-12 | 2005-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-10 | 2009-05-12 | 2009-11-11 | $7700.00 | Window Closed / Lapsed |