JPH0713402Y2 - Engine generator controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a generator control device for an engine, which adjusts a generated voltage of a generator driven by an engine so as to have a desired value.

(Prior Art) A generator mounted on an automobile or the like is driven by an engine mounted on the automobile or the like to perform a power generating operation, and the generated electric power obtained by the generator is mounted on the automobile or the like. The battery is charged, and further, electric power is supplied to lamps and various auxiliary devices in an automobile or the like. For such a generator driven by the engine, a voltage regulator is usually provided so that a substantially constant generated voltage value is maintained regardless of the operating state of the engine.

In a conventionally proposed electric machine control device including a voltage regulator attached to a generator driven by an engine, for example, as shown in Japanese Utility Model Laid-Open No. 58-175000, the generated voltage of the generator is A generator voltage detection unit that detects the value is provided, and the power generation operation control of the generator is performed based on the detected output voltage obtained by the generator voltage detection unit so that the generated voltage value is maintained within a predetermined range. However, in the case where the power generation operation control of the power generator is performed by such a power generator control device, for example, a conductor wire that connects the battery output terminal of the power generator and the battery, which normally has a relatively long path, If the characteristic deteriorates and its resistance value increases, causing a large voltage drop compared to the normal state, keep the generated voltage value of the generator within the specified range. Is controlled,
The value of the voltage actually applied to the battery from the battery output terminal becomes lower than the normal voltage value, and as a result, inconvenience such as shortage of battery charge may occur.

Therefore, in order to avoid such an inconvenience, in addition to the generator voltage detection unit that detects the generated voltage value of the generator, the terminal voltage value of the battery that is connected to the battery output terminal of the generator via a lead wire is detected. A battery voltage detection unit is provided, and the power generation operation control of the generator is performed by using both the detection output voltage obtained from the generator voltage detection unit and the detection output voltage obtained from the battery voltage detection unit. Machine control devices are being considered.

A configuration including a generator provided with such a generator control device is represented by, for example, the circuit shown in FIG. This circuit has a normal structure having a rotor and a stator, and has a battery 60 at its battery output terminal 52 for a generator 50 driven by an engine.
Is connected through the conductor 62, and its line output terminal
A voltage regulator 70 is connected to 54 and the field terminal 56. The voltage regulator 70 is formed by a series connection of a resistor 72 and a variable resistor 74 connected to the line output terminal 54 of the generator 50, and a generator voltage detector 76 that detects the generated voltage value of the generator 50. And a resistor 78 and a variable resistor connected at one end of the battery 60 through a conductor 66 with a switch 64.
A battery voltage detection unit 82 that is formed by serial connection with 80 and detects the terminal voltage value of the battery 60 is provided. The connection point P between the resistor 72 and the variable resistor 74 in the generator voltage / voltage detector 76 is connected via the diode 83, and
Resistor 78 and variable resistor 80 in the battery voltage detector 82
A connection point Q between the excitation current control unit 88 and the cathode of the Zener diode 86 are commonly connected via the diode 84, and the anode of the Zener diode 86 has the output end connected to the field terminal 56 of the generator 50. Is connected to the input end of.

Based on such a configuration, at the input end of the excitation current control unit 88,
Detection output voltage of the generator voltage detection unit 76 obtained at the connection point P
From the higher one of Vp and the detection output voltage Vq of the battery voltage detection unit 82 obtained at the connection point Q when the switch 64 is turned on, the forward voltage across the diode 83 or 84 and the Zener diode 86 A voltage lower by a voltage corresponding to the sum of the voltages at both ends of is applied. Then, when the detected output voltage Vp or Vq exceeds the predetermined value Vx, the voltage supplied to the input end of the exciting current control unit 88 also exceeds the predetermined value Vxi, and the exciting current control unit 88 is wound around the rotor of the generator 50. The exciting current flowing through the generated field coil is limited, and the generated voltage value of the generator 50, and thus the voltage value obtained at the line output terminal 54, is reduced. As a result, the generated voltage value of the generator 50 is the specified value.
Undesired rise above Vn is prevented.

In such a circuit, the battery output terminal of the generator 50
When the conductor wire 62 connecting the battery 52 and the battery 60 has not deteriorated in characteristics, when the voltage value of the line output terminal 54 of the generator 50 is the predetermined value Vn, the terminal voltage value of the battery 60 is also substantially the predetermined value Vn. Becomes Then, under such circumstances, the generator voltage detection unit
When the variable resistor 74 of 76 and the variable resistor 80 of the battery voltage detection unit 82 are adjusted to set the detection output voltage Vp to be lower than the detection output voltage Vq, the line output terminal 54 of the generator 50 The voltage value and the terminal voltage value of the battery 60 are the predetermined value Vn
When the voltage exceeds Vx, the detected output voltage Vq exceeds the predetermined value Vx, but the detected output voltage Vp does not exceed the predetermined value Vx. Under such a condition, the exciting current controller
88 controls the excitation current flowing through the field coil wound around the rotor of the generator 50 to lower the generated voltage value of the generator 50 because the detected output voltage Vq is a predetermined value Vx.
Therefore, the control for maintaining the generated voltage value of the generator 50 at the predetermined value Vn is performed based on the detected output voltage Vq.

On the other hand, when the conductor 62 connecting the battery output terminal 52 of the generator 50 and the battery 60 is deteriorated in characteristics and its resistance value increases, the voltage value of the line output terminal 54 of the generator 50 is set to a predetermined value. When the value is Vn, the terminal voltage value of the battery 60 becomes lower than the predetermined value Vn. In such a case, under the condition that the variable resistor 74 of the generator voltage detection unit 76 and the variable resistor 80 of the battery voltage detection unit 82 are adjusted as described above, the exciting current control unit 88 causes the rotor of the generator 50 to operate. The control of limiting the exciting current flowing through the wound field coil to lower the power generation voltage value of the generator 50 is performed by increasing the power generation voltage value of the generator 50 beyond a predetermined value Vn and increasing the battery 60. When the terminal voltage value of V exceeds the specified value Vn, the detected output voltage Vq
Exceeds the specified value Vx, or when the terminal voltage value of the battery 60 is close to the specified value Vn, the detected output voltage
Vq does not exceed the predetermined value Vx, but the detected output voltage Vp exceeds the predetermined value Vx. Therefore, in this case, the generated voltage value of the generator 50 is the predetermined value Vx.
The control to set a certain higher value is the detected output voltage.
It is performed based on Vp or the detected output voltage Vq, which depends on the degree of the voltage drop caused by the deterioration of the characteristics of the conductor 62.

As a result, the terminal voltage value of the battery 60 is set to the predetermined value Vn or a value close to the predetermined value Vn despite the characteristic deterioration of the conductor 62, and the problem of insufficient charging is solved or reduced. Become.

(Problems to be Solved by the Invention) However, as described above, the conductor wire 62 connecting the battery output terminal 52 of the generator 50 and the battery 60 causes characteristic deterioration, which causes an increase in its resistance value. In the circuit configuration that is designed to eliminate or reduce the problem of insufficient charging of the battery 60 due to the disconnection, the conductor 66 that connects one end of the battery 60 and the battery voltage detection unit 82 of the voltage regulator 70 is disconnected. Alternatively, the connection end portion is loosened or disconnected, and the voltage of the battery 60 is not properly applied to the battery voltage detection unit 82.
A problem occurs when the proper detection output voltage Vq cannot be obtained from 82.

That is, the battery voltage detection unit 82 outputs an appropriate detection output voltage Vq.
If is not obtained, the power generation voltage value of the generator 50 is controlled based on the detected output voltage Vp obtained from the generator voltage detection unit 76. At that time, the generator voltage detection unit 76, the detection output voltage Vp, even if the voltage value at the line output terminal 54 of the generator 50 exceeds the predetermined value Vn, does not exceed the predetermined value Vx, the voltage at the line output terminal 54. Since the value is set to exceed the predetermined value Vx when the value exceeds a certain value higher than the predetermined value Vn, the exciting current control unit 88 limits the exciting current of the generator 50 to generate a voltage value of the generator 50. The control for lowering the value is performed when the power generation voltage value of the generator 50 exceeds a certain value higher than the predetermined value Vn. Therefore, in such a case,
The generated voltage value of the generator 50 is controlled so as to be maintained at a certain value higher than the predetermined value Vn, and therefore,
When the conductor 62 connecting the battery output terminal 52 of the generator 50 and the battery 60 has not deteriorated in characteristics, or even if the deterioration is slight, the predetermined value Vn
A higher voltage is applied and the battery
Overcharging of 60 or other inconvenience may occur.

In view of such a point, the present invention provides a generated voltage value of a generator driven by an engine, a detected output voltage obtained from a generator voltage detection unit that detects a voltage value of an output terminal of the generator,
It is assumed that control is performed based on the detected output voltage obtained from the battery voltage detection unit that detects the terminal voltage value of the battery charged by the generator, and the conductor connecting the generator and the battery deteriorates in characteristics and resistance. When the value increases, a situation such as insufficient charging of the battery may occur, and disconnection of the conductor connecting the battery and the battery voltage detection unit or loosening or disconnection of the connection end may cause battery voltage detection. It is an object of the present invention to provide a generator control device for an engine capable of avoiding any situation in which an inconvenience such as overcharging of a battery occurs when an appropriate detection output voltage cannot be obtained from the engine section. And

(Means for Solving Problems) In order to achieve the above-mentioned object, an engine generator control device according to the present invention determines a terminal voltage value of a battery charged by generated power of a generator driven by the engine. The battery voltage detection unit that detects and obtains the battery voltage detection output voltage, and the generation voltage value of the generator is detected, and the terminal voltage value of the battery and the generation voltage value of the generator are equal. A first generator voltage detector that obtains a first detected output voltage that is set to be low and a generator voltage value of the generator are detected, and the terminal voltage value of the battery is equal to the generator voltage value of the generator. A second generator voltage detection unit that obtains a second detection output voltage that is originally set to be equal to the battery voltage detection output voltage, and a battery voltage detection output voltage or a first detection output voltage or a second And a generator voltage adjusting unit that controls the generated voltage of the generator based on the detected output voltage of the generator, and the generator voltage adjusting unit detects the battery voltage when the battery voltage detection output voltage is normally obtained. The power generation operation control of the generator is performed based on one of the output voltage and the first detected output voltage, and the battery is caused by a disconnection in a conductor connecting the battery and the battery voltage detection unit or a looseness or disconnection of the connection end. When the voltage detection output voltage is not normally obtained, the generation voltage control of the generator is performed based on the second detection output voltage.

(Operation) In the engine generator control device according to the present invention having such a configuration, from the battery voltage detection unit, for example,
When the battery voltage detection output voltage formed by dividing the terminal voltage value of the battery is normally obtained,
From the generator voltage detection unit of, for example, a first detection output voltage formed by dividing the output terminal voltage of the generator is obtained, and the generated voltage of the generator is determined by the generator voltage adjustment unit to the battery voltage. One of the detected output voltage and the first detected output voltage is controlled based on, for example, the one having a higher value, and the wire connecting the battery and the battery voltage detection unit is disconnected or loosened at the connection end. When the battery voltage detection output voltage cannot be normally obtained due to disconnection, the second detection output voltage formed by dividing the output terminal voltage of the generator from the second generator voltage detection unit, for example. Then, the power generation voltage of the generator is controlled by the generator voltage adjusting unit based on the second detected output voltage.

Therefore, in the case where the conductor connecting the generator and the battery deteriorates in characteristics and causes an increase in resistance value, for example, the battery voltage detection output obtained from the battery voltage detection unit having the higher value. The generated voltage control of the generator is performed based on the voltage or the first detected output voltage obtained from the first generator voltage detection unit, and the generated voltage value of the generator is the predetermined value or the terminal voltage value of the battery. The values are adjusted so that the values are close to each other, so that a situation in which an inconvenience such as insufficient charging of the battery occurs is avoided. Further, for example, in the case where the battery voltage detection output voltage cannot be normally obtained from the battery voltage detection unit due to disconnection or loosening or disconnection of the connection end in the conductor connecting the battery and the battery voltage detection unit, The generator voltage control is performed based on the second detected output voltage obtained from the second generator voltage detector to adjust the generator voltage value to a predetermined value. A situation in which an inconvenience such as overcharging occurs is avoided.

(Embodiment) FIG. 1 shows an example of a generator control device for an engine according to the present invention, together with a generator to which the control device is applied and its peripheral portion.

In FIG. 1, a generator 10 has a known structure including a rotor and a stator, a field coil 11 is wound around the rotor, and three stator coils 12 connected in Y to the stator. Is wrapped around. The rotor is rotated by a rotational force of a crankshaft of an engine (not shown) at, for example, twice the rotational speed of the crankshaft. Then, the three-phase AC voltage induced in each of the stator coils 12 in accordance with the rotation of the rotor under the excitation current flowing in the field coil 11, the diode groups 13a, 13b and 1 connected to each of the stator coil 12
Of the 3c, the generated voltage Vo obtained by rectifying by the full-wave rectifying circuit formed by the diode values 13a and 13b is obtained at the battery output terminal 14, and the diode groups 13a and 13c are also provided.
The generated voltage Vo obtained by being rectified by the full-wave rectifying circuit formed at is obtained at the line output terminal 15. The line output terminal 15 is connected to the ignition terminal 16 inside the generator 10, and also the line output terminal 15
Both ends of the field coil 13 are connected to the ignition terminal 16 and the field terminal 17, respectively.

A battery 20 is connected to the battery output terminal 14 of the generator 10.
Are connected through a conductor 21. Further, an ignition switch 22, a charge lamp, a lamp relay 24, and a backflow prevention diode 25 are connected between the ignition terminal 16 and the battery 20, and the line output terminal 15 and the field terminal 17 are connected to each other. A voltage regulator 30 forming an example of a generator control device for an engine according to the present invention
Are connected.

The voltage regulator 30 is a conductor with a switch 26 that interlocks with the ignition switch 22 at one end of the battery 20.
A resistor 31 and a variable resistor 32 are connected in series to form a battery voltage detector 33 for detecting the terminal voltage value of the battery 20, and a line output terminal 15 of the generator 10. Resistor 34, NPN transistor connected to
35 collector-emitter paths, resistor 36 and variable resistor
A resistor connected to a line output terminal 15 of the generator 10 and a first generator voltage detector 38 formed of a series connection circuit including 37 to detect the value of the generated voltage Vo of the generator 10. 3
9. A second generator voltage detector 43 formed of a series connection circuit including an emitter-collector passage of the PNP transistor 40, a resistor 41 and a variable resistor 42 to detect the value of the generated voltage Vo of the generator 10. Is equipped with. First generator voltage detector 38
The base of the NPN transistor 35 in is connected to the one end of the lead wire 27 via the resistor 44 in the battery voltage detection unit 33.
The base of the PNP transistor 40 in the second generator voltage detector 43 is connected to the emitter of the NPN transistor 35 in the first generator voltage detector 38.

The connection point R between the resistor 31 and the variable resistor 32 in the battery voltage detector 33 is connected to the resistor 36 and the variable resistor in the first generator voltage detector 38 via the diode 45.
The connection point S between 37 and the diode 46,
The connection point T between the resistor 41 and the variable resistor 42 in the second generator voltage detection unit 43 is commonly connected to the cathode of the Zener diode 48 via the diode 47. The output terminal of the anode of the Zener diode 48 is the generator 10
Is connected to the input terminal of the exciting current control unit 49 connected to the field terminal 17 of the.

In the voltage regulator 30 having such a specific configuration, the battery voltage detection output voltage Vr obtained by dividing the terminal voltage of the battery 20 at the connection point R in the battery voltage detection unit 33 while the switch 26 is turned on. The detection output voltage Vs obtained by dividing the power generation voltage Vo of the generator 10 at the connection point S in the first generator voltage detection unit 38, and
At the connection point T in the second generator voltage detector 43, the generator
Detection output voltage Vt obtained by dividing the generated voltage Vo of 10
Is adjusted so that the value of the terminal voltage of the battery 20 is adjusted by the variable resistors 32, 37 and 42, respectively.
The detection output voltage Vs is set to be lower than the battery voltage detection output voltage Vr, and the detection output voltage Vt is set to be equal to the detection output voltage Vr.

Based on such a configuration, when the ignition switch 22 and the switch 26 are turned on, the exciting current supplied from the battery 20 to the field coil 11 of the generator 10 via the lamp relay 24 and the diode 25 is changed. , Flows through the excitation current control unit 49 of the voltage regulator 30, the generator 10 is in a power generation state, and the lamp relay 24 is turned on,
The charge lamp 23 is turned on. And generator
At the battery output terminal 14 of 10, the generated voltage Vo having a predetermined value Vn
Then, the battery 20 is charged by the electric power from the battery output terminal 14 of the generator 10. In such a state, the supply of the exciting current to the field coil 11 of the generator 10 is performed through the diode group 13c in the generator 10, and the voltage of the ignition terminal 16 rises, so that the battery 20 for the lamp is supplied. The electric current does not flow through the relay 24, the lamp relay 24 is turned off, and the charge lamp 23 is turned off.

In such a state, the battery output terminal of the generator 10
The conductor wire 21 that connects the battery 14 and the battery 20 is not deteriorated in characteristics, and the conductor wire 27 that connects the battery 20 and the battery voltage detection unit 33 of the voltage regulator 30 is disconnected or loosened or disconnected at the connection end. When not, the terminal voltage of the battery 20 becomes substantially equal to the power generation voltage Vo of the generator 10. The resistor 4 is connected to the base of the NPN transistor 35 in the first generator voltage detector 38 of the voltage regulator 30.
The terminal voltage of the battery 20 is applied through 4 and the NPN transistor 35 is turned on. As a result, the base of the PNP transistor 40 in the second generator voltage detector 43 is placed in the high potential state, and the NPN transistor 35 is turned off. Therefore, at this time, the second generator voltage detector 43 The detection output voltage Vt of is not obtained. On the other hand, at the connection point R in the battery voltage detection unit 33, the battery voltage detection output voltage Vr formed by dividing the terminal voltage of the battery 20 that is substantially equal to the generated voltage Vo of the generator 10 is the first generator. The detected output voltage Vs obtained by dividing the power generation voltage Vo at the connection point S in the voltage detection unit 38 is normally obtained with a higher value.

Therefore, at the input terminal of the exciting current control unit 49, the sum of the voltage across the forward direction of the diode 45 and the voltage across the Zener diode 48 is calculated from the battery voltage detection output voltage Vr obtained at the connection point R in the battery voltage detection unit 33. A voltage lower by a corresponding voltage is applied. Then, the generated voltage Vo of the generator 10 exceeds the predetermined value Vn, and accordingly, the battery
The terminal voltage of 20 rises and the battery voltage detection output voltage Vr
Exceeds a predetermined value Vx, the voltage supplied to the input terminal of the exciting current control unit 49 also exceeds the predetermined value Vxi, and the exciting current control unit 49 limits the exciting current flowing through the field coil 11 of the generator 10 to generate power. The value of the power generation voltage Vo of the machine 10 is reduced. As a result, it is possible to prevent the value of the generated voltage Vo of the generator from exceeding the predetermined value Vn and undesirably rising. That is, the control for maintaining the value of the power generation voltage Vo of the generator 10 at the predetermined value Vn is performed based on the battery voltage detection output voltage Vr.

In contrast, the battery output terminal 14 of the generator 10 and the battery
When the conductive wire 21 connecting with 20 deteriorates in characteristics and increases in resistance value, the terminal voltage of the battery 20 becomes lower than the generated voltage Vo of the generator 10 due to the accompanying voltage drop. Therefore, even if the value of the generated voltage Vo of the generator 10 exceeds the predetermined value Vn, the normally obtained battery voltage detection output voltage Vr does not exceed the predetermined value Vx,
The excitation current control unit 49 controls the excitation current flowing through the field coil 11 of the generator 10 to reduce the value of the generation voltage Vo of the generator 10 by controlling the value of the generation voltage Vo of the generator 10. Rises above a predetermined value Vn and the terminal voltage value of the battery 20 exceeds a predetermined value Vn, and the battery voltage detection output voltage Vr exceeds a predetermined value Vx, or
Although the battery voltage detection output voltage Vr does not exceed the predetermined value Vx when the value of the terminal voltage of 20 is close to the predetermined value Vn, it is obtained at the connection point S in the first generator voltage detection unit 38. This is the time when the detected output voltage Vs exceeds the predetermined value Vx. Therefore, in this case, control so that the value of the power generation voltage Vo of the generator 10 becomes a certain value higher than the predetermined value Vn is performed based on the battery voltage detection output voltage Vr or the detection output voltage Vs. Which is based on the degree of the voltage drop caused by the deterioration of the characteristics of the conductor 27.

As a result, the value of the terminal voltage of the battery 20 is set to the predetermined value Vn or a value close to the predetermined value Vn despite the deterioration of the characteristics of the conductor 27, thereby avoiding a situation in which an inconvenience such as insufficient charging of the battery 20 occurs. It

In addition, the conductor 27 connecting the battery 20 and the battery voltage detector 33 of the voltage regulator 30 is broken or loosened or disconnected at the connection end, and the battery voltage detector
When the terminal voltage of the battery 20 is not applied to 33, the battery voltage detection output voltage Vr from the battery voltage detection unit 33 cannot be obtained normally. At this time, the terminal voltage of the battery 20 is not applied to the base of the NPN transistor 35 in the first generator voltage detection unit 38, and the NPN transistor 35 is turned off. As a result, the base of the PNP transistor 40 in the second generator voltage detector 43 is placed in the low potential state, and the PNP transistor 40 is turned on. Therefore, at this time, the detected output voltage Vs from the first generator voltage detector 38 is not obtained, and only the detected output voltage Vt is obtained at the connection point T in the second generator voltage detector 43. Therefore, at the input end of the exciting current control unit 49, the forward voltage across the diode 47 and the voltage across the Zener diode 48 are detected from the detected output voltage Vt obtained at the connection point T in the second generator voltage detection unit 43. A voltage lower by a voltage corresponding to the sum is applied. Then, the value of the generated voltage Vo obtained at the line output terminal 15 of the generator 10 is the predetermined value Vn.
When the output voltage Vt exceeds the predetermined value Vx, the detected output voltage Vt exceeds the predetermined value Vx, and accordingly, the voltage supplied to the input terminal of the excitation current control unit 49 also exceeds the predetermined value Vxi, and the excitation current control unit 49 causes the generator 10 to operate. Limits the exciting current flowing through the field coil 11 of
The value of the generated voltage Vo of the generator 10 is reduced. As a result, the value of the generated voltage Vo of the generator 10 is prevented from undesirably rising beyond the predetermined value Vn. That is, the generated voltage Vo of the generator 10
The control for maintaining the value of Vn at the predetermined value Vn is performed based on the detected output voltage Vt.
The situation that inconvenience such as overcharging occurs is avoided.

In this way, according to the above-mentioned example, the conductor 21 that connects the battery output terminal 14 of the generator 10 and the battery 20 does not deteriorate in characteristics, and the battery 20 and the voltage regulator
The value of the generated voltage Vo of the generator 10 is maintained at the predetermined value Vn when the conductor wire 27 connecting the battery voltage detection unit 33 in 30 does not have a disconnection, a loose connection end, or the like. Not only is the control properly performed, but when the conductor 21 connecting the battery output terminal 14 of the generator 10 and the battery 20 has deteriorated in characteristics and causes an increase in resistance, the terminal voltage of the battery 20 The situation where the value is set to a predetermined value Vn or a value close to the predetermined value Vn to avoid inconvenience such as insufficient charging of the battery 20 is further avoided.
When the terminal voltage of the battery 20 is no longer applied to the battery voltage detection unit 33 due to disconnection or loosening or disconnection of the lead wire 27 connecting the battery voltage detection unit 33 of the voltage regulator 30 The control for maintaining the value of the power generation voltage Vo of the machine 10 at the predetermined value Vn is performed based on the detected output voltage Vt, and a situation in which a problem such as overcharging of the battery 20 occurs can be avoided.

(Effect of the Invention) As is clear from the above description, according to the generator control device for an engine of the present invention, the generated voltage value of the generator driven by the engine is detected, and the voltage value of the output terminal of the generator is detected. When performing control based on the detection output voltage obtained from the generator voltage detection unit and the battery voltage detection output voltage obtained from the battery voltage detection unit detecting the terminal voltage value of the battery charged by the generator, the generator When the conductor connecting the battery and the battery has not deteriorated in characteristics, and the conductor connecting the battery and the battery voltage detector is not broken or the connection end is loose or disconnected, under normal conditions. , Of course, it is possible to properly perform the control so that the generated voltage value of the generator is maintained at a predetermined value, and the conductor connecting the generator and the battery causes characteristic deterioration. When the resistance value increases due to the increase of the resistance value, it is possible to control the value of the terminal voltage of the battery to be a proper value or a value close to the proper value, and avoid a situation such as insufficient charging of the battery. In addition, even in the case where an appropriate battery voltage detection output voltage cannot be obtained from the battery voltage detection unit due to disconnection in the conductor connecting the battery and the battery voltage detection unit or loosening or disconnection of the connection end, etc. It is possible to perform control so that the generated voltage value of the generator is maintained at a predetermined value, and it is possible to avoid a situation in which inconvenience such as overcharging of the battery occurs.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing an example of a generator control device for an engine according to the present invention together with an engine to which the engine is applied and its peripheral parts, and FIG. 2 is provided with a conventionally considered generator control device. It is a circuit block diagram which shows the structure containing a generator. In the figure, 10 is a generator, 11 is a field coil, 14 is a battery output terminal, 15 is a line output terminal, 17 is a field terminal, 20 is a battery, 21 and 27 are lead wires, 30 is a voltage regulator, 33 is a battery voltage detection. Reference numeral 38 is a first generator voltage detector, 43 is a second generator voltage detector, and 49 is an exciting current controller.

Claims (1)

[Scope of utility model registration request] 1. A terminal voltage value of a battery charged by generated power of a generator driven by an engine is detected,
A battery voltage detection unit that obtains a battery voltage detection output voltage, detects the power generation voltage value of the generator, and the battery voltage detection output voltage when the terminal voltage value of the battery is equal to the power generation voltage value of the generator. A first generator voltage detector that obtains a first detected output voltage that is set to be lower, and a generator voltage value of the generator is detected, and a terminal voltage value of the battery and a generator voltage of the generator are detected. A second generator voltage detector that obtains a second detection output voltage that is set to be equal to the battery voltage detection output voltage under the same value, and the battery voltage detection output voltage is normally obtained. When
A power generation voltage control of the generator is performed based on one of the battery voltage detection output voltage and the first detection output voltage, and a disconnection or loosening of a connection end in a conductor connecting the battery and the battery voltage detection unit. When the battery voltage detection output voltage is not normally obtained due to disconnection or disconnection, a generator voltage adjustment unit that controls the generation voltage of the generator based on the second detection output voltage, and Generator control device for the engine.