JPS604657B2 - Automotive generator automatic control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, an automobile generator is controlled according to the amount of charge of a battery connected as a load to reduce the load applied to the engine.

A generator installed in an automobile is driven by an engine and generates an output voltage to charge a battery and also supplies power to each load.

Therefore, even if the battery is fully charged, it is always in a power generation state and becomes a load on the engine. This invention differs from conventional methods of this type in that it is limited to cases where the terminal voltage of the battery drops below the set value, or even if it is within the set value, during deceleration when the vehicle is running due to inertia and charging does not become a load on the engine. The idea is to control the generator so that it can be charged, thereby reducing the load on the engine.

For this purpose, the present invention includes a first voltage comparator circuit that is turned on and generates an output when the terminal voltage of a battery to be charged by obtaining the output of a generator falls below a first set level; A second voltage comparator circuit that turns on and generates an output when the voltage drops below a second set level that is higher than the set level, and a second voltage comparator circuit that turns on and generates an output when the output of the second voltage comparator circuit and the stop lamp that lights up when the brake is operated are on a logic circuit that turns on and generates an output when a deceleration signal is obtained, and a logic circuit that is driven when an output of the first voltage comparison circuit or logic circuit is obtained and acts to energize the excitation coil of the generator. According to this switching circuit, the generator's excitation coil is energized only when the battery voltage drops below a set level or when deceleration occurs, and as a result, the engine This makes it possible to significantly reduce the load on the operator.

Next, the illustrated embodiment will be described.

FIG. 1 shows a block diagram of this invention device.
1 is a generator mounted on a wheel, 2 is a battery that is charged by obtaining the output of the generator 1, and 3 is a load such as a lighting lamp connected to the battery 2.

4 is a first voltage comparator circuit, which constantly detects the terminal voltage of the battery 2, and calculates this voltage as the voltage e when the battery voltage e when fully charged decreases (for example, the battery voltage when fully charged). This circuit operates to turn on when the voltage drops further below 60 to 70% of e.

5 is a second voltage comparison circuit, and this circuit is turned on when the battery voltage e falls further below the voltage e2 (for example, about 90% or less of the battery voltage e when fully charged) when the battery voltage e slightly drops. This is a circuit that works as follows. Furthermore, e. <e2. 7 is a switching circuit, which is operated by the input from the voltage comparison circuit, and although not shown in the figure, acts to energize the excitation coil of the generator 1, increasing the amount of charge to the battery 2. It turns out.

This operation is performed immediately when the voltage comparator circuit 4 operates, but since the output of the voltage comparator circuit 5 is connected to the switching circuit 7 via the logic circuit 6 constituted by an AND circuit, other inputs of the logic circuit 6 may be used. Then, only when a deceleration signal is applied, the power generation action of the generator 1 increases and the battery 2 is sufficiently charged. As shown in FIG. 2, the operating conditions of the voltage comparison circuits 4 and 5 were set to a voltage e2 that is slightly lower than the battery voltage e when fully charged, and a voltage e that is even lower than this voltage e2. If the battery voltage is less than e, the voltage comparator 4 operates to charge the battery 2, and if the battery voltage is higher than e and less than e2, the logic circuit 6 operates. Only when a deceleration signal is input at , the amount of power generated by the generator 1 increases and charging is performed. FIG. 3 shows a specific example of the circuit of the device of this invention. In this embodiment, the voltage comparator circuit 4
A preset reference voltage is set and applied to the voltage comparison circuit 5 as follows. That is, Zener diode Z
After making the voltage constant at D, the voltage X2 divided by resistors R3 and R4 is applied as a reference voltage to the voltage comparator circuit 4, while the voltage X2 divided by resistors R5 and R6 is applied to the voltage comparator circuit 5. The voltage X3 thus obtained is applied as a reference voltage. In this case, the conditions are that It is equal to the partial pressure value X when the voltage drops to . Next, the terminal for detecting the voltage drop of the battery 2 of each voltage comparator circuit is connected to a resistor R, . It supplies a voltage X divided by R2, and when the voltage of the battery 2 is e, this voltage X has a relationship with the reference voltage X3 of the voltage comparison circuit 5 such that X,>X3. It is set to . Therefore, the voltage comparator circuit 4 does not operate when the terminal voltage of the battery is e and X2<×, e2 and X2<×, and e.
When the vehicle descends further, X2>×, and the operation is performed.

In the voltage comparator circuit 5, the battery voltage is e and X3<
If it descends from x, , e2, then X3>x, and the operation will occur. Therefore, when the voltage of the battery 2 is e, neither of the voltage comparison circuits 4 and 5 operates.
However, if the voltage falls below e, the voltage X divided by the resistors R, , R2 will be reduced to
, R4, the voltage comparator circuit 4 operates, and the transistors 7a and 7 forming the switching circuit operate.
b and 7c are turned on, causing current to flow through the excitation coil la of the generator 1 and acting to increase the amount of power generation. As a result,
Battery 2 is charged. Naturally, the voltage comparator circuit 5 also operates. The terminal voltage of battery 2 increases,
If e exceeds (but is lower than e2), the voltage comparator circuit 4
The operation of resistors R5 and R6 of voltage comparator circuit 5 stops.
Since the reference voltage X3 still satisfies X3>×, this voltage comparison circuit 5 is in an operating state. However, diodes 6a and 6b are connected between the voltage comparator circuit 5 and the switching circuit 7.
Since there is a logic circuit 6 composed of
The switching circuit 7 operates only when a deceleration signal is applied to the other input terminal 62 while the operating signal of the voltage comparator circuit 5 is applied to one input terminal 6 of the switching circuit 7.
The generator 1 acts to increase the amount of power generated by the generator 1 by driving the generator 1 .
Note that the deceleration signal applied to the other input terminal 62 of the logic circuit 6 configured as an AND circuit is the stop lamp 3 that is part of the load.
' is a high-level potential at the connection point A between the stop lamp 3' and the stop switch (brake switch) 8 when it lights up, and the brake operation that causes deceleration is performed.
When the stop switch 8 is closed, the stop lamp is energized, causing a voltage drop that becomes a deceleration signal, and the deceleration signal is applied to the other input terminal 62 of the logic circuit 6. Therefore, as already explained, when the terminal voltage of the battery 2 is e, there is no effect of increasing the power generation amount of the generator 1, and if the load applied to the engine is reduced and the voltage drops beyond e2, the normal Charging is attempted only when the vehicle is decelerated by braking while the vehicle is running.

In this charging operation, the wheels are running due to inertia, so even if the power generation amount of the generator 1 is increased, it does not substantially impose a load on the engine. Next, when the voltage drops beyond e, the amount of power generation is increased even without the deceleration signal, and the charging operation continues until a predetermined voltage value is reached. As is clear from the above explanation, this invention controls the amount of power generated by the generator according to the terminal voltage of the battery, so the generator does not always serve as a load on the engine, and therefore It is possible to reduce the load on the engine and also to reduce fuel consumption.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the device according to the invention, FIG. 2 is a graph showing the terminal voltage characteristics of the battery with respect to the amount of charge, and FIG. 3 is a diagram showing a specific circuit example of the device according to the invention. 1... Generator, la... Excitation coil,
2... Battery, 3... Load, 3'... Stop lamp, 4, 5... Voltage comparison circuit, 6...
...Logic circuit, 7...Switching circuit, 8...Stop switch. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 A first voltage comparator circuit that turns on and generates an output when the terminal voltage of the battery that is charged by obtaining the output of the generator falls below a first set level, and a second voltage comparator circuit that is set higher than the first set level. A second voltage comparator circuit that turns on and generates an output when the voltage drops below a set level, and a second voltage comparator circuit that turns on when the output of the second voltage comparator circuit and the deceleration signal that occurs when the stop lamp that lights up when the brake is operated are received. It is characterized by comprising a logic circuit that generates an output, and a switching circuit that is driven when the output of the first voltage comparison circuit or the logic circuit is obtained and acts to energize the excitation coil of the generator. Automatic control device for automotive generators.