JP2002238295A - Control apparatus of generator for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the control apparatus of a generator for vehicles that can adjust a field current limitation value to an arbitrary value, and can improve accuracy. SOLUTION: A field current detector 9 has a current detection section 308 for detecting a field current in the generator 1 for vehicles, and outputs detection output according to the output of the current detection section 308. A current-limitation means 3 has a switching element 305 for intermittently controlling the field current in the generator 1 for vehicles, and controls the ratio of switching time in the switching element 305 based on the detection output of the field current detector 9, thus limiting the field current so that the field current does not exceed a specific limiting value, and inhibiting the load torque of an engine so that the load torque does not become excessive. Also, the current limitation means has limitation value changing means 910, 911, 912, 913, Sa, and Sb for changing the specific limitation value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular generator control device, and more particularly to a vehicular generator control device that adjusts an output voltage of a generator by controlling a field current of the generator. It is.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram showing a conventional control device for a vehicle generator disclosed in Japanese Patent No. 2127889. In FIG. 3, reference numeral 1 denotes a vehicle generator (hereinafter simply referred to as a generator) driven by an engine (not shown), and includes an armature coil 101 and a field coil 102. A rectifier 2 for full-wave rectification of the AC output of the generator 1 has output terminals 201, 202, and 203.
The output terminal 201 is an output terminal that outputs a main output,
The output terminal 202 is an output terminal for exciting the field coil 102 and detecting a voltage of the voltage regulator 3 described later.
Is an output terminal for grounding.

[0005] Reference numeral 3 denotes a voltage regulator for adjusting the output voltage of the generator 1 to a predetermined value, and is composed of components described later. 301 and 302 are voltage dividing resistors for dividing the output voltage of the output terminal 202 of the rectifier 2, and 303 is the voltage dividing resistor 30.
A zener diode which detects the divided potential of the first and second potentials 302 and conducts when a predetermined value or more is reached, a transistor 304 which conducts when the zener diode 303 conducts, and a switching element 305 which interrupts the current of the field coil 102 of the generator 1 And the transistor 304
Open / close control.

Further, reference numeral 306 denotes a base resistor of the transistor 305, and reference numeral 307 denotes a diode which is connected in parallel to the field coil 102 of the generator 1 and absorbs an intermittent surge of the field coil.

[0005] Reference numeral 4 denotes a battery mounted on the vehicle;
Denotes various electric loads of the vehicle, 6 denotes a key switch, 7 denotes a resistance for initial excitation for initially exciting the field coil 102 of the generator 1, and 8 denotes a backflow prevention diode.

Further, reference numeral 308 in the voltage regulator 3 is a field current detecting resistor as a current detecting section connected in series with the field coil 102, and is formed of a very small resistance of several tens of milliohms. . Reference numeral 309 denotes a backflow prevention diode. The voltage regulator 3 functions as current limiting means, and the field current detection resistor 308 and the field current detector 9 described below constitute a field current detector.

Reference numeral 9 denotes a field current detector, which is constituted by each unit described later. A1 and A2 are output terminals of a constant voltage power supply (not shown), which output simultaneously with closing of the key switch 6. Reference numeral 901 denotes a comparator, which becomes operable at the same time when the key switch 6 is closed. 902,903
Is a voltage dividing resistor for dividing the constant voltage power supply A1, and the voltage dividing point is connected to the minus input of the comparator 901, and is used as a reference voltage of the comparator. 904 is a capacitor, 9
05 is a resistor that determines the charging time constant of the capacitor 904;
Reference numeral 906 denotes a current limiting resistor connected to the constant voltage source A2 and the output terminal of the comparator 901, 907 denotes a base resistance of the transistor 304 of the voltage regulator 3, and 908 denotes a backflow prevention diode.

In the control device for a vehicle generator having such a configuration, the field current detector 9 controls the voltage regulator 3 when the generator 1 is cold and the maximum value of the field current is large. To control the average value of the field current by interrupting the current of the field coil 102. If the generator is hot and the maximum value of the field current is a steady value, the intermittent operation is stopped. Voltage regulator 3
The voltage regulator 3 controls the output voltage of the normal generator without any influence on the output voltage of the generator.

The voltage regulator 3 limits the field current so as not to exceed a predetermined limit value by controlling the switching time ratio of the switching element 305 for intermittently controlling the field current of the generator 1. The output and the driving torque of the generator 1 when it is cold are suppressed so as not to be excessive. Since the load on the engine is reduced by suppressing the cold drive torque of the generator 1 from becoming excessive, the idle speed is stabilized,
Fuel efficiency is also improved.

In addition, since the voltage regulator 3 limits the field current by controlling the switching time ratio of the switching element 305 for intermittently controlling the field current, the power loss due to the limitation of the field current is reduced. Almost never invited.

Further, since the predetermined limit value is selected to be equal to or greater than the field current to be passed to obtain a predetermined output when the temperature of the generator 1 rises to the predetermined value, the voltage regulator 3 This does not impair the nominal output of the generator.

[0012]

However, in the control device for a vehicle generator having such a structure, the field current limit value, that is, the above-mentioned predetermined limit value varies greatly due to a manufacturing error in the production of the product. However, there is a problem that the detection accuracy of the field current is not good.

Further, since the field current limit value is constituted by only a single value set in the control device of the vehicle generator, various current limit settings are made in accordance with the specifications of the field coil of the generator. There is a problem that it is necessary to manufacture a control device for a vehicle generator having a value.

The present invention has been made to solve the above-described problems, and can adjust a field current limit value to an arbitrary value, and can improve accuracy.
Further, it is another object of the present invention to provide a control device for a vehicular generator which can be a control device corresponding to a generator having a plurality of different field coils with one type of control device.

[0015]

A control device for a vehicle generator according to the present invention has a field current detector and current limiting means, and is provided in a vehicle generator mounted on a vehicle and driven by an engine. A control device for an AC generator for a vehicle for intermittently controlling a field current, wherein the field current detector has a current detection unit for detecting a field current of the generator for a vehicle, and an output of the current detection unit. The current limiting means has an opening / closing element for intermittently controlling the field current of the vehicle generator, and opens / closes the switching element based on the detection output of the field current detector. Limiting the field current so as not to exceed a predetermined limit value by controlling the time ratio so as to prevent the load torque of the engine from becoming excessive, and changing the predetermined limit value. Means are provided.

The limit value changing means is connected to the field current detector, and selects one of a plurality of voltage dividing resistors for dividing the voltage of the constant voltage power supply and a plurality of voltage dividing resistors to make them valid. It has an external output terminal.

Further, a plurality of voltage dividing resistors and external output terminals are provided, and a predetermined limit value is adjusted to an arbitrary value by a combination of the voltage dividing resistors.

Further, the external output terminal is grounded, and the predetermined limit value is adjusted to an arbitrary value.

Further, the external output terminal is grounded, and the predetermined limit value is adjusted to an arbitrary value.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a circuit diagram showing an embodiment of a control device for a vehicle generator according to the present invention. In FIG. 1, reference numeral 1 denotes a generator driven by an engine (not shown), and includes an armature coil 101 and a field coil 10.
Two. A rectifier 2 for full-wave rectification of the AC output of the generator 1 has output terminals 201, 202, and 203. The output terminal 201 is an output terminal that outputs a main output, and the output terminal 202 is an output terminal for exciting the field coil 102 and detecting a voltage of the voltage regulator 3 described below.
The output terminal 203 is an output terminal for grounding.

Reference numeral 3 denotes a voltage regulator for adjusting the output voltage of the generator 1 to a predetermined value, and is composed of components described later. 301 and 302 are voltage dividing resistors for dividing the output voltage of the output terminal 202 of the rectifier 2, and 303 is the voltage dividing resistor 30.
A zener diode which detects the divided potential of the first and second potentials 302 and conducts when a predetermined value or more is reached, a transistor 304 which conducts when the zener diode 303 conducts, and a switching element 305 which interrupts the current of the field coil 102 of the generator 1 And the transistor 304
Open / close control.

Reference numeral 306 denotes a base resistor of the transistor 305, and reference numeral 307 denotes a diode which is connected in parallel to the field coil 102 of the generator 1 and absorbs an intermittent surge of the field coil.

Reference numeral 4 denotes a battery mounted on the vehicle;
Denotes various electric loads of the vehicle, 6 denotes a key switch, 7 denotes a resistance for initial excitation for initially exciting the field coil 102 of the generator 1, and 8 denotes a backflow prevention diode.

Further, reference numeral 308 in the voltage regulator 3 is a field current detecting resistor connected in series with the field coil 102 and serving as a current detecting unit, and is formed of a minimum resistance of several tens of milliohms. . Reference numeral 309 denotes a backflow prevention diode. The voltage regulator 3 functions as current limiting means, and the field current detection resistor 308 and the field current detector 9 described below constitute a field current detector.

Reference numeral 9 denotes a field current detector, which is constituted by each unit described later. A1 and A2 are output terminals of a constant voltage power supply (not shown), which output simultaneously with closing of the key switch 6. Reference numeral 901 denotes a comparator, which becomes operable at the same time when the key switch 6 is closed. 902,903
Is a voltage dividing resistor for dividing the constant voltage power supply A1, and the voltage dividing point is connected to the minus input of the comparator 901, and is used as a reference voltage of the comparator. 904 is a capacitor, 9
05 is a resistor that determines the charging time constant of the capacitor 904;
Reference numeral 906 denotes a current limiting resistor connected to the constant voltage source A2 and the output terminal of the comparator 901, 907 denotes a base resistance of the transistor 304 of the voltage regulator 3, and 908 denotes a backflow prevention diode.

Reference numerals 910, 911 and 912, 913 are voltage dividing resistors connected in parallel with the resistor 903. Resistance 91
0, 911, 912, and 913 are each set to a predetermined resistance value. Also, the resistance value of each resistor is
The difference is made small so that fine adjustment can be made by selection. 9a and 9b are resistors 910,
These are external output terminals drawn from voltage division points 911, 912, and 913. Sa and Sb are external output terminals 9a,
9b and a switch provided between the ground. The switches Sa and Sb are actually provided on a circuit, and are formed by a pattern that is short-circuited by, for example, solder. Note that the resistors 910, 911, 912, and 913 and the switches Sa and Sb constitute limit value changing means for changing a predetermined limit value of the field current (field current limit value).

In the control device for a vehicle generator having such a configuration, when one or both of the switches Sa and Sb are closed, the reference voltage input to the negative input of the comparator 901 becomes equal to the resistance 910, 911 and 91
It depends on the partial pressure ratio of 2,913. That is, when the external output terminal 9a is grounded by the switch Sa, the reference voltage of the comparator 901 decreases, and the field current limit value is set low. When the external output terminal 9b is further grounded by the switch Sb, the field current limit value is set lower. The vehicle generator control device of the present invention includes:
By performing the grounding process of the external output terminals 9a and 9b as described above, the setting of the field current limit value can be adjusted,
It is possible to cope with a plurality of field current limit values.

From the above, in the control device for a vehicle generator according to the present embodiment, the field current detectors 9, 3
08 and a current limiting means 3 for controlling the field current of the vehicle generator 1 mounted on the vehicle and driven by the engine intermittently. Reference numerals 9 and 308 each include a current detection unit 308 that detects a field current of the vehicle generator 1, and outputs a detection output in accordance with the output of the current detection unit 308. A switching element 305 for intermittently controlling the field current of the vehicle generator 1 is provided, and the field current is controlled by controlling the switching time ratio of the switching element 305 based on the detection outputs of the field current detectors 9 and 308. A limit value changing means 910, 911, 912, 913, Sa, which limits the load torque of the engine so as not to become excessive by limiting the load torque so as not to exceed a predetermined limit value. Sb is provided. Therefore, the field current limit value can be changed to an arbitrary value, and the accuracy of the field current limit value can be improved.

The limiting value changing means is connected to the field current detector 9 and divides the voltage of the constant voltage power supply A1 into a plurality of voltage dividing resistors 910, 911, 912 and 913, and a plurality of voltage dividing resistors. External output terminal 9 to select and enable one
a, 9b. Therefore, it is possible to configure a field current limiting function corresponding to a generator having a plurality of different field coils with a single type of vehicle generator control device.

The voltage dividing resistors 910, 911, 912,
913 and a plurality of external output terminals 9a and 9b are provided, and a predetermined limit value is adjusted to an arbitrary value by a combination of the voltage dividing resistors 910, 911, 912 and 913. for that reason,
The field current limit value can be adjusted to an arbitrary value.

The external output terminals 9a and 9b are grounded, and the predetermined limit value is adjusted to an arbitrary value. for that reason,
Since the ground portion exists in many portions on the circuit, it is easy to configure the circuit.

In the above-described embodiment, although there are two sets of voltage dividing resistors for changing the reference voltage inputted to the comparator 901 and the external output terminals derived from the voltage dividing points, more sets are provided. It may be finely changeable.

Embodiment 2 FIG. FIG. 2 is a circuit diagram showing another example of the embodiment of the control device for the vehicle generator of the present invention. In FIG. 2, switches Sa and Sb are connected to an output terminal 9z of a constant voltage power supply. Other configurations are the same as those of the first embodiment.

In the vehicle generator control device having such a configuration, the reference voltage input to the comparator 901 can be changed by closing one or both of the switches Sa and Sb. That is, when the external output terminal 9a is connected to the output terminal 9z, the reference voltage of the comparator 901 increases, and the field current limit value is set high. Further, the external output terminal 9b is connected to the output terminal 9z.
, The field current limit value is further increased, and by connecting the external output terminals 9a and 9b to the power supply terminal,
The setting of the field current limit value can be adjusted, and it is possible to cope with a plurality of field current limit values.

From the above, in the control device for a vehicle generator according to the present embodiment, the external output terminals 9a, 9
b is grounded, and the predetermined limit value is adjusted to an arbitrary value. Therefore, the operation is assured and the reliability is improved.

[0036]

The control device for a vehicle generator according to the present invention has a field current detector and current limiting means, and controls the field current of the vehicle generator mounted on the vehicle and driven by the engine. A control device for a vehicle alternator for intermittent control,
The field current detector has a current detection unit that detects a field current of the vehicle generator, and outputs a detection output in accordance with an output of the current detection unit. A switching element for intermittently controlling the field current of the generator, and controlling a switching time ratio of the switching element based on a detection output of the field current detector so that the field current does not exceed a predetermined limit value. And a limit value changing means for changing a predetermined limit value is provided. Therefore, the field current limit value can be changed to an arbitrary value, and the accuracy of the field current limit value can be improved.

The limit value changing means is connected to the field current detector and selects one of a plurality of voltage dividing resistors for dividing the voltage of the constant voltage power supply and a plurality of voltage dividing resistors to make them effective. It has an external output terminal. Therefore, it is possible to configure a field current limiting function corresponding to a generator having a plurality of different field coils with a single type of vehicle generator control device.

A plurality of voltage dividing resistors and external output terminals are provided, and a predetermined limit value is adjusted to an arbitrary value by a combination of the voltage dividing resistors. Therefore, the field current limit value can be adjusted to an arbitrary value.

Further, the external output terminal is grounded, and the predetermined limit value is adjusted to an arbitrary value. Therefore, since the ground portion exists in many portions on the circuit, it is easy to configure the circuit.

Further, the external output terminal is grounded, and the predetermined limit value is adjusted to an arbitrary value. Therefore, the operation is assured and the reliability is improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a control device for a vehicle generator according to the present invention.

FIG. 2 is a circuit diagram showing another example of the embodiment of the control device for the vehicle generator of the present invention.

FIG. 3 is a circuit diagram showing a conventional control device for a vehicle generator.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 vehicle generator, 101 armature coil, 102 field coil, 2 rectifier, 3 voltage regulator (current limiting means), 305 transistor (switching element), 308 resistor for detecting field current (field current detector) , Current detector),
9. Field current detector, 910, 911, 912, 913
Resistance (limit value changing means), Sa and Sb switches (limit value changing means), A1 constant voltage power supply.

Continued on the front page (72) Inventor Katsuhiro Sasaki 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Seiji Hanuki 3-6-3 Kitano 3-chome, Niiza-shi, Saitama Sanken Within Electric Co., Ltd. (72) Inventor Hideharu Takano 3-6-3 Kitano, Niiza-shi, Saitama F-term within Sanken Electric Co., Ltd. 5H590 AA02 AA08 AB07 BB05 CA23 CC01 CD01 CE03 DD16 DD17 EA10 EA13 EB13 EB18 FA06 FB01 FC12 FC17 FC21 GA03 GB01 HA05 HB03 JB07 JB08

Claims (5)

[Claims] 1. A control device for an automotive alternator having a field current detector and current limiting means for intermittently controlling a field current of a vehicle generator mounted on a vehicle and driven by an engine. The field current detector has a current detection unit for detecting a field current of the vehicle generator, and outputs a detection output in accordance with the output of the current detection unit. Has a switching element for intermittently controlling the field current of the vehicle generator, and controls the opening / closing time ratio of the switching element based on the detection output of the field current detector to limit the field current to a predetermined value. A limit value changing means for changing the predetermined limit value, wherein the load torque of the engine is suppressed so as not to exceed a predetermined value. Machine control device. 2. The limiting value changing means is connected to the field current detector and selects a plurality of voltage dividing resistors for dividing a voltage of a constant voltage power supply, and selects one of the plurality of voltage dividing resistors. The control device for a vehicle generator according to claim 1, further comprising an external output terminal for enabling. 3. The apparatus according to claim 2, wherein a plurality of said voltage dividing resistors and said external output terminals are provided, and said predetermined limit value is adjusted to an arbitrary value by a combination of said voltage dividing resistors.
4. The control device for a vehicle generator according to claim 1. 4. The control device according to claim 2, wherein the external output terminal is grounded, and the predetermined limit value is adjusted to an arbitrary value. 5. The vehicle generator according to claim 2, wherein the external output terminal is connected to a high potential side of the constant voltage power supply, and the predetermined limit value is adjusted. Control device.