JPS6033717Y2 - Charging generator control device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to, for example, a control device for a charging motor that controls the output voltage of an alternator driven by an internal combustion engine or the like to a predetermined value.

First, a conventional device of this type will be explained with reference to FIG.

In FIG. 1, 1 is an alternating current generator driven by an engine (not shown) installed in a vehicle (not shown), and has an armature coil 101 and a field coil 102 connected in a three-phase star shape. are doing.

2 is a full-wave rectifier that performs full-wave rectification of the AC output of the generator 1, 201 is a first rectified output end on the (+) side, and 202 is a (+) side first rectified output end.
) side second rectified output end, 203 is a (-) side rectified output end.

Reference numeral 3 denotes a voltage regulator that controls the output voltage of the generator 1 to a predetermined value by controlling the field current flowing through the field coil 102 of the generator 1, and is composed of the following parts.

That is, 301 is a surge absorbing diode connected to both ends of the field coil 102, 302 is an NPN power transistor that is connected in series to the field coil 102 and is a switching element that cuts off the field current. 303 is a resistor provided in the base circuit of the transistor 302;
4 is an NP that controls on/off of the transistor 302;
The N-type detection transistor 305 is a Zener diode 30 which is a voltage detection element that detects the output voltage of the generator 1 and becomes conductive when the output voltage reaches a predetermined value or more.
6, 307 is a resistor connected in series between the rectified output terminals 202, 203 and constitutes a voltage dividing circuit; 4 is a storage battery;
5 is a key switch, 6 is an initial excitation resistor, 7 is a charge indicator light, 8 is a switch, and 9 is a short-time electric load used at the time of cold start.

Next, the operation of the conventional device configured as above will be explained.

First, when the key switch 5 is closed when starting the engine, a base current is supplied from the storage battery 4 to the transistor 302 via the key switch 5, the initial excitation resistor 6, the charging indicator light 7, and the resistor 303, and the transistor 302 Conduct.

When the transistor 302 becomes conductive, a field current is supplied from the storage battery 4 to the field coil 102 via the key switch 5, the resistor 6, the indicator light 7, the field coil 101, and the transistor 302, and a field magnetomotive force is generated. .

Next, in this state, when the engine is started and the generator 1 is driven, the armature coil 101 generates an AC output.

When this output voltage exceeds a predetermined value, the potential at the connection point of resistors 306 and 307 forming the voltage divider circuit changes to the Zener diode 3.
It becomes more than the sum of the zener voltage of 05 and the base-emitter voltage of the transistor 304, and the zener diode 305
A base current is supplied to the conductive transistor 304, and the transistor 304 becomes conductive.

When the transistor 304 conducts, the transistor 302
is cut off, the field current of the field coil 102 decreases, and the output voltage of the generator 1 decreases.

When this output voltage drops below a predetermined value, the Zener diode 305 and transistor 304 are cut off again, and the transistor 302 is turned on to supply field current to the field coil 102, so that the output voltage of the generator 1 is rise again.

The above-described operation is repeated to control the output voltage of the generator 1 to a predetermined value, and the storage battery 4 is charged to the predetermined value using this controlled voltage.

On the other hand, when the key switch 5 is closed while the engine is stopped, the charging indicator light 7 lights up to indicate the non-charging state of the generator 1 because the field current flows through the charging indicator light 7, and then the engine is stopped. When the generator 1 starts to generate electricity and the terminal voltages of the second rectified output terminal 202 and the storage battery 4 become approximately equal, the charging indicator lamp 7 turns off due to a decrease in potential difference, indicating the state of charge of the storage battery 4. indicate.

However, in the conventional device described above, when supplying power for a short time (several minutes to more than ten minutes) to a high-power, short-time electrical load (such as a hot wire defogger for rear window glass) that is inserted during a cold start, the Although it is related to the number of revolutions, the generator 1 has an insufficient output, the storage battery 4 is in a discharged state, and the terminal voltage of the storage battery 4 decreases, which has the disadvantage that the effect of the hot wire defogger is reduced.

This invention provides an excellent charging motor control device that eliminates the above-mentioned drawbacks.

In other words, this invention uses the resistance of the voltage dividing resistor for detecting the voltage of the voltage regulator only when both the choke activation switch, which operates at cold start, and the timer, which operates for a predetermined period of time after the generator starts generating electricity, are operating. By changing the ratio and increasing the output voltage of the generator, it is possible to prevent the terminal voltage of the storage battery from decreasing even when power is supplied to a high-voltage load for a short time during a cold start.

An embodiment of this invention shown in FIG. 2 will be described below.

In FIG. 2, 103 is the neutral point of the star-connected armature coil 101 of the generator 1, 308 and 309 are connected in series with the voltage dividing resistor 306, and the output terminals 202 and 20 are connected in series.
A voltage dividing resistor 310 divides the voltage between the voltage regulators 3 and 310, and a voltage dividing resistor 310 is an NP that switches a predetermined value of the voltage regulator 3 by being conductive.
an N-type changeover switch transistor; 311 is a resistor provided in the base circuit of the transistor 310; 10 is a choke activation switch that closes when a choke (not shown) is activated when the engine is started cold; Reference numeral 11 denotes a protection device for failure to return the choke switch and malfunction, which includes a normally open contact 111, a drive coil 112 that drives the contact 111, and a drive coil 112 that connects the coil 112 when voltage is generated at the neutral point 103 of the generator 1. Timer 1 that starts timing as soon as the device is turned on and shuts off after a predetermined period of time (several minutes to more than ten minutes)
Consists of 13.

Next, the operation of the device constructed as described above will be explained.

First, when the choke is activated during a cold start of the engine, the choke activation switch 10 is closed.

When the key switch 5 is closed in this state, a base current flows from the storage battery 4 to the transistor 302 via the key switch 5, the resistor 6, the indicator light 7, and the resistor 303, and the transistor 302 becomes conductive.

Therefore, the field current is supplied to the field coil 102,
Generates field magnetomotive force.

On the other hand, at this time, since no voltage is generated at the neutral point 103, the timer 113 is in a cut-off state, and the coil 11 is in a cut-off state.
2 is deenergized, the normally open contact 111 remains open, and the transistor 310 is cut off. In this state, the lower resistance of the voltage divider circuit is the sum of the resistors 308 and 309, and the voltage regulator 3 The predetermined value is set to a first predetermined value (approximately 140 to 150 V) that is optimal for charging the storage battery 4.

When the engine starts in this state, an alternating current output is induced in the armature coil 101 and is full-wave rectified by the full-wave rectifier 2.

At this time, a voltage is also generated at the neutral point 103, and this voltage starts the timer 113, energizes the coil 112, and closes the contact 111.

Then, a base current flows from the storage battery 4 to the transistor 310 via the key switch 5, the choke activation switch 10, the contact 111, and the resistor 311, and the transistor 310 becomes conductive.

When the transistor 310 becomes conductive, the resistor 309 is short-circuited via the transistor 310, and the lower resistor of the voltage divider circuit becomes
This is equivalent to using only the resistor 308, and the predetermined value of the voltage regulator is set to a second predetermined value (15 to 16) higher than the first predetermined value.

At this time, when the switch 8 of the short-time electric load (for example, a hot wire defogger, etc.) 9, which is generally used at cold start, is closed, the load 9 is supplied with power at the second predetermined value, and the storage battery 4 is charged. It is.

At this time, the second predetermined value is 1 compared to the normal state as described above.
Since the value is set to a high value of about 2 V, the charging of the storage battery 4 discharged at the time of startup is enhanced, and the defogger effect of the load 9 is also enhanced.

Next, if operation is continued in this state, the engine will complete warm-up operation and the choke will stop operating.

Then, the choke activation switch 10 is opened and the transistor 310 is also cut off, so that the predetermined value of the voltage regulator 3 becomes the first predetermined value again, and the charging of the storage battery 4 becomes the optimum value.

At this time, if the choke is manual, it may be forgotten to return it, but in this case as well, the timer 113 is activated and after the above-mentioned predetermined time has elapsed, the coil 112 is deenergized and the contact 111 is opened, ensuring that the first predetermined value is reached. Therefore, even during steady operation, the second
will not reach the predetermined value and the storage battery 4 will not be overcharged.

In this embodiment, the voltage regulator 3 is of a semiconductor type, but a contact type may have the same effect.

Further, although the voltage at the neutral point 103 of the generator 1 is used to start the timer, the same effect can be obtained at the second rectified output end 202.

As described above, this invention enhances the charging of the storage battery during a cold start by setting the second predetermined value higher than the first predetermined value that is optimal for charging the storage battery only during a cold start. It has the effect of increasing the effects of defogger and the like by supplying power to large electrical loads for a short period of time.

In addition, to prevent forgetting to return the choke, a timer is inserted to ensure that the first predetermined value is reached after several minutes to 10-odd minutes, so the storage battery will not be overcharged or the generator will overheat. It has a non-destructive effect.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram showing a conventional device, and FIG. 2 is an electric circuit diagram showing an embodiment of this invention. In the figure, 1 is a charging generator, 101 is an armature coil, 102
is a field coil, 103 is a neutral point, 2 is a full-wave rectifier, 3
4 is a voltage regulator, 4 is a storage battery, 5 is a key switch, 9 is a short-time electric load, 10 is a choke activation switch, and 11 is a choke-return protection device. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] an alternator driven by an engine and having a field coil;
A storage battery that is charged by the rectified output of the generator, a short-time electric load that is supplied with power from the storage battery when the engine is cold started, a choke activation switch that detects the operation of a choke that is activated when the engine is cold started, and the generator. The timer starts counting when it detects that the generator has generated electricity, and then operates for a predetermined time.The rectified output of the generator is divided into voltages using a voltage dividing resistor, and when this detected value exceeds a predetermined level, the field is activated. a voltage regulator that controls the rectified output voltage of the generator to a predetermined value by opening a switching element connected in series with the coil; and a voltage regulator that is operated only when both the choke activation switch and the timer are in operation; A charging engine equipped with a switch means for changing the partial voltage resistance ratio of the voltage regulator so that the rectified output voltage of the generator becomes a second predetermined value that is higher than the first predetermined value that is optimal for charging the storage battery. Control device.