JPH057960B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for keeping the generated voltage of a vehicle charging generator constant.

This type of control device (hereinafter referred to as regulator)
By controlling the rotor coil current of the generator connected to the engine and rotating, the generated voltage of the generator is maintained at a predetermined regulated voltage regardless of the engine speed or increase or decrease of the electrical load, The use of electronics has made the entire device more compact, and it is usually attached to the generator.

Incidentally, in recent years, attempts have been made to control the power generation amount of the charging generator according to the engine load state and battery charging state. A regulator has been proposed that allows the set voltage of the generator to be selected. Here, when increasing the amount of power generation, the set voltage is increased, and when decreasing the amount of power generation, the set voltage is lowered.

In such a regulator, if the number of external signals is increased in order to finely control the amount of power generation,
Correspondingly, signal input terminals must be added, which increases the size of the regulator and also increases the trouble of wiring.

In particular, since the central computer that detects the engine load status etc. is installed on the vehicle body side, it is necessary to lay a signal line over a relatively long distance from the vehicle body side to the regulator in the engine room, which reduces the labor of wiring. desired.

The present invention has been made in view of these problems, and provides a regulator in which the set voltage can be selected by an external signal, and in which the number of wiring for inputting external signals is significantly reduced, thereby reducing the trouble of wiring. It is intended to.

That is, the regulator of the present invention generates a selection signal with a different voltage level depending on the input status of the signal indicating whether the key switch is turned on or off, as well as the input status of other external signals, and the selection signal provided on the vehicle body side. a generation circuit; and a control circuit provided in a charging generator that inputs the selection signal from the selection signal generation circuit and charges a battery, and the control circuit adjusts the generated voltage of the charging generator to a predetermined value. A power generation voltage control circuit that controls according to the voltage;
When the voltage level of the selection signal indicates that the key switch is turned on, power is allowed to be supplied to the power generation voltage control circuit, and when the voltage level of the selection signal indicates that the key switch is not turned on, power is supplied to the power generation voltage control circuit. a power switch circuit that cuts off the supply; and an adjustment voltage selection circuit that changes the adjustment voltage of the power generation voltage control circuit in accordance with the voltage level when the voltage level of the selection signal indicates the input status of the other external signal. It is equipped with.

According to the above configuration, only one selection signal line needs to be wired between the selection signal generation circuit on the vehicle body side and the control circuit on the charging generator installed in the engine room, so the wiring man-hours are significantly reduced. be done. In particular, since the power supply wiring from the key switch can also be omitted and concentrated on the selection signal wiring, the wiring reduction effect is significant.

The present invention will be explained below with reference to illustrated embodiments.

In FIG. 1, 1 is a charging generator, and 2 is a regulator unit as a control circuit provided integrally with the generator, and is composed of a generated voltage control circuit 21 and an adjustment voltage selection circuit 22. Reference numeral 3 designates a selection signal generation circuit provided at the output interface of a computer mounted on the vehicle body separately from the regulator section 2. Further, 4 is a battery, 5 is a key switch, and 6 is an electric load.

In the power generation voltage control circuit 21, the current i is the current flowing through the resistor 211, the voltage V _A is the divided voltage of the resistors 211 and 212 connected in series between the power supplies, and the voltage V _A is the Zener voltage of the Zener diode 213. The generated voltage V _B is controlled so as to be maintained constant at the sum of the base-emitter forward voltage of the transistor 214 and the base-emitter forward voltage of the transistor 214 . In other words, the generated voltage
When V _B decreases and the voltage V _A becomes lower than the Zener voltage, the transistor 215 is made conductive via the transistor 214, the rotor coil 11 of the generator 1 is excited, and the voltage V _B increases. On the other hand, when the generated voltage V _B increases and the voltage V _A becomes higher than the Zener voltage, the transistor 215 becomes non-conductive, and the energization to the rotor coil 11 is stopped and the voltage decreases.
V _B decreases. In this way, the voltage V _A is kept constant, and the generated voltage V _B is controlled to match the constant regulated voltage V _R shown in the following equation ( ₁ ), where the resistance value of the resistor 211 is R1. Ru.

V _R =V _A +i・R ₁ ...(1) The adjustment voltage selection circuit 22 includes a comparator 221
is provided. A constant voltage V _C is input to the negative input terminal of the comparator 221, and a selection signal generated from the selection signal generation circuit 3 is input to the positive input terminal.
O ₁ is entered. When the voltage of the signal O ₁ is lower than the voltage V _C , the output of the comparator 221 is “0”
level, current flows into the comparator 221 from the connection point between the resistors 211 and 212, and as a result, the current i increases and the adjusted voltage V _R
becomes higher. When the voltage of the signal O ₁ is higher than the voltage V _C , the output of the comparator 221 becomes “1” level, the flow of current to the comparator 221 is stopped, and the regulated voltage V _R becomes low.

The selection signal generating circuit 3 receives external signals such as a key switch on/off signal _S1 and a signal _S2 generated from a computer (not shown). The signal _S2 becomes, for example, an "O" level or a "1" level depending on the engine load condition.

The operation of the regulator having the above configuration will be explained below. When the key switch 5 is not turned on, the signal _S1 is at the "O" level, and therefore the voltage of the selection signal _O1 is OV (region x in FIG. 2). As a result, the transistor 222 constituting the power switch circuit 222 in the selection circuit 22
a, 222b and the transistor 215 of the voltage control circuit 21 are all rendered non-conductive, no excitation current is supplied to the rotor coil 11, and power generation by the generator 1 is stopped.

When the key switch 5 is turned on and the signal _S2 is at the "0" level, the transistors 31 and 3
2 is non-conductive, so the voltage of selection signal 0 ₁ is the voltage obtained by dividing the battery voltage by resistors 33 and 34.
V ₁ (y area in Figure 2). As a result, the transistors 222a and 222b become conductive, and the transistor 215 of the voltage control circuit 21 becomes conductive. When the engine starts and the rotation of the generator begins to increase, power generation begins. And the above voltage
Since V ₁ is set lower than the voltage V _C , the output of the comparator 221 is at the "0" level, and as described above, the generated voltage V _B is controlled to the high regulation voltage _VR .

On the other hand, when the engine load increases rapidly, such as when the vehicle suddenly accelerates, the signal _S2 becomes "1" level. In this case, transistors 31 and 32
is conductive, and the resistor 35 is connected in parallel to the resistor 33. As a result, the voltage of the selection signal ₀₁ becomes a voltage _V2 higher than the voltage _V1 . The voltage V ₂ is set higher than the voltage V _C , so the comparator 22
The output of 1 becomes the "1" level, and as mentioned above,
The generated voltage V _B is now controlled to a lower regulation voltage _VR . As a result, the amount of power generated by the generator 1 connected to the engine is reduced, the load on the engine is reduced, and smooth acceleration is possible.

As described above, the regulator of the present invention is provided with a selection signal generation circuit on the vehicle body side that generates selection signals with different voltage levels, and on the other hand, the regulator part integrated with the generator has a selection signal generation circuit that generates selection signals with different voltage levels. A regulating voltage selection circuit that selects a predetermined regulating voltage according to the voltage is provided, making it possible to select multiple regulating voltages with a single selection signal, thereby greatly reducing the wiring effort. It is.

Furthermore, in this embodiment, power generation is stopped via the selection signal when the key switch is turned off, so that wiring can be further reduced.

Note that the adjustment voltage selection circuit 22 may have a configuration as shown in FIG. That is, instead of the comparator 221 in FIG.
3,224, a Zener diode 225 and a resistor 226 are provided, and the base of the transistor 224 is
Emitter forward voltage and Zener diode 225
The sum of the Zener voltages is defined as the voltage V _C.

As a result, when the voltage of the selection signal 0 ₁ is lower than the voltage V _C , the transistor 224 is in a non-conducting state;
The transistor 223 becomes conductive, and the regulated voltage V _R becomes high as in the above embodiment. Conversely, when the voltage of the selection signal ₀₁ becomes higher than V _C , the transistor 224 becomes conductive, the transistor 223 becomes non-conductive, and the adjustment voltage V _R becomes low.

As described above, the vehicle charging generator control device of the present invention can appropriately control the amount of power generated by the generator, is compact, and requires less wiring.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the control device, FIG. 2 is a diagram showing the voltage level of a selection signal, and FIG. 3 is a circuit diagram showing another embodiment of the adjustment voltage selection circuit. 1... Charging generator, 2... Regulator section (control circuit), 21... Generation voltage control circuit, 22...
Adjustment voltage selection circuit, 222...Power switch circuit, 3...Selection signal generation circuit, 4...Battery, 5
...Key switch, 6...Electric load.

Claims (1)

[Claims] 1 Generate a selection signal with a different voltage level depending on the input status of a signal indicating whether the key switch is turned on or off, as well as the input status of other external signals,
It has a selection signal generation circuit provided on the vehicle body side, and a control circuit provided in a charging generator that inputs the selection signal from the selection signal generation circuit and charges the battery, and the control circuit is configured to control the charging generator. a power generation voltage control circuit that controls the power generation voltage according to a predetermined adjustment voltage; and a power generation voltage control circuit that allows power supply to the power generation voltage control circuit when the voltage level of the selection signal indicates that the key switch is turned on; a power switch circuit that cuts off the power supply to the power generation voltage control circuit when the voltage level indicates that the key switch is not turned on; and a voltage level of the selection signal when the voltage level of the selection signal indicates that the other external signal is input. A control device for a vehicle charging generator, comprising: an regulated voltage selection circuit that changes the regulated voltage of the generated voltage control circuit in accordance with the regulated voltage of the generated voltage control circuit.