US5140253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for vehicle a.c. generator
Assignee: Mitsubishi Electric Corp
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Filing: 1990-01-08
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Granted: 1992-08-18
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Expires: 2010-01-08
Abstract
Abstract A control device for a motor vehicle alternating current generator for controlling a field current of the generator with use of voltage control circuitry and field current limiting circuitry, wherein a field current limiting value is varied successively based on the detected output voltage of the generator and the field current is increased smoothly upon an increased demand.
Inventors
- 👤 Kenji Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:40
CPC Classifications
H; H02; H02P; H02P9/00; H02P9/14; H02P9/26; H02P9/30; H02P9/305
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
161 words
A control device for a motor vehicle engine driven alternating current generator, comprising: voltage detecting means for detecting an output voltage of said generator, voltage control means for ON and OFF controlling a switching element which performs field current switching of said generator based on a detected signal obtained by comparing an output of the voltage detecting means with a standard voltage, field current detecting means for detecting the field current; field curent limiting means for controlling the switching element based on a detected signal obtained by comparing an output of the field current detecting means with a predetermined field current limiting value; and field current limiting value control means for successively varying the field current limiting value based on the output of the voltage detecting means, wherein said field current limiting value control means includes a D/A converter and an UP/DOWN counter the counting direction of which is controlled by the state of the output of the voltage detecting means.
Claim 2
Dependent Claim
161 words
A control device for a motor vehicle engine driven alternating current generator, comprising: voltage detecting means for detecting an output voltage of said generator, voltage control means for ON and OFF controlling a switching element which performs field current switching of said generator based on a detected signal obtained by comparing an output of the voltage detecting means with a standard voltage, field current detecting means for detecting the field current; field curent limiting means for controlling the switching element based on a detected signal obtained by comparing an output of the field current detecting means with a predetermined field current limiting value; and field current limiting value control means for successively varying the field current limiting value based on the output of the voltage detecting means, wherein said field current limiting value control means includes a D/A converter and an UP/DOWN counter the counting direction of which is controlled by the state of the output of the voltage detecting means.
Claim 3
Dependent Claim
38 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 1, wherein said field current detecting means includes a resistor connected in series with a field coil of the alternating current generator.
Claim 4
Dependent Claim
41 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 1, wherein said field current limiting means includes a comparator and a flip-flop circuit to provide a pulse duration control signal to the switching element.
Claim 5
Dependent Claim
38 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 1, wherein said switching element is switched alternatively by the outputs of the voltage control means and the field current limiting means.
Claim 6
Dependent Claim
25 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 1, wherein said switching element is a power transistor.
Claim 7
Dependent Claim
43 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 2, wherein a voltage across the detecting resistor is fed to a non-inverting amplifier for deriving an output therefrom to compare with the field current limiting value.
Claim 8
Dependent Claim
147 words
A control device for a motor vehicle engine driven alternating current generator, comprising: voltage detecting means for detecting an output voltage of said generator, voltage control means for ON and OFF controlling a switching element which performs field current switching of said generator based on a detected signal obtained by comparing an output of the voltage detecting means with a standard voltage, field current detecting means for detecting the field current; field current limiting means for controlling the switching element based on a detected signal obtained by comparing an output of the field current detecting means with a predetermined field current limiting value; and field current limiting value control means for successively varying the field current limiting value based on the output of the voltage detecting means, wherein said switching element is switched alternately by outputs of the voltage control means and the field current limiting means.
Claim 9
Dependent Claim
147 words
A control device for a motor vehicle engine driven alternating current generator, comprising: voltage detecting means for detecting an output voltage of said generator, voltage control means for ON and OFF controlling a switching element which performs field current switching of said generator based on a detected signal obtained by comparing an output of the voltage detecting means with a standard voltage, field current detecting means for detecting the field current; field current limiting means for controlling the switching element based on a detected signal obtained by comparing an output of the field current detecting means with a predetermined field current limiting value; and field current limiting value control means for successively varying the field current limiting value based on the output of the voltage detecting means, wherein said switching element is switched alternately by outputs of the voltage control means and the field current limiting means.
Claim 10
Dependent Claim
38 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 1, wherein said field current detecting means includes a resistor connected in series with a field coil of the alternating current generator.
Claim 11
Dependent Claim
41 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 7, wherein said field current limiting means includes a comparator and a flip-flop circuit to provide a pulse duration control signal to the switching element.
Claim 12
Dependent Claim
25 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 7, wherein said switching element is a power transistor.
Claim 13
Dependent Claim
43 words
A control device for a motor vehicle engine driven alternating current generator as defined in claim 8, wherein a voltage across the detecting resistor is fed to a non-inverting amplifier for deriving an output therefrom to compare with the field current limiting value.
Claim 14
Dependent Claim
209 words
A control device for a motor vehicle engine driven alternating current generator, comprising: voltage detecting means for detecting an output voltage of said generator, voltage control means for ON and OFF controlling a switching element which performs field current switching of said generator based on a detected signal obtained by comparing an output of the voltage detecting means with a standard voltage, field current detecting means for detecting the field current; field current limiting means for controlling the switching element based on a detected signal obtained by comparing an output of the field current detecting means with a predetermined field current limiting value; and field current limiting value control means for successively varying the field current limiting value based on the output of the voltage detecting means, wherein said field current limiting value control means includes a D/A converter and an UP/DOWN counter the counting direction of which is controlled by the state of the output of the voltage detecting means, wherein said field current detecting means includes a resistor connected in series with a field coil of the alternating current generator, and wherein a voltage across the detecting resistor is fed to a non-inverting amplifier for deriving an output therefrom to compare with the field current limiting value.
Claim 15
Dependent Claim
209 words
A control device for a motor vehicle engine driven alternating current generator, comprising: voltage detecting means for detecting an output voltage of said generator, voltage control means for ON and OFF controlling a switching element which performs field current switching of said generator based on a detected signal obtained by comparing an output of the voltage detecting means with a standard voltage, field current detecting means for detecting the field current; field current limiting means for controlling the switching element based on a detected signal obtained by comparing an output of the field current detecting means with a predetermined field current limiting value; and field current limiting value control means for successively varying the field current limiting value based on the output of the voltage detecting means, wherein said field current limiting value control means includes a D/A converter and an UP/DOWN counter the counting direction of which is controlled by the state of the output of the voltage detecting means, wherein said field current detecting means includes a resistor connected in series with a field coil of the alternating current generator, and wherein a voltage across the detecting resistor is fed to a non-inverting amplifier for deriving an output therefrom to compare with the field current limiting value.
Claim 16
Dependent Claim
40 words
A control device for a motor vehicle engine alternating current generator as defined in claim 13, wherein said field current limiting means includes a comparator and a flip-flop circuit to provide a pulse duration control signal to the switching element.
Claim 17
Dependent Claim
24 words
A control device for a motor vehicle engine alternating current generator as defined in claim 12, wherein said switching element is a power transistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-18 | 1996-02-17 | 1996-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-18 | 2000-02-17 | 2000-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-18 | 2004-02-17 | 2004-08-18 | $7700.00 | Window Closed / Lapsed |