JPH0463639B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a vehicle charging generator that controls the voltage generated by the vehicle charging generator to a predetermined voltage.

Since the vehicle charging generator is connected to the engine and its rotational speed varies over a wide range, a control device (hereinafter referred to as a regulator) is provided to control the generated voltage to a predetermined value.

This type of regulator normally controls the generated voltage by turning on and off the field winding current of the charging generator, causing the generator to generate electricity intermittently. The power generation time is increased in order to maintain the generated voltage constant.

Incidentally, in recent years, the number of electrical components in vehicles has increased rapidly, and along with this, charging generators have also become larger. Furthermore, a large-capacity charging generator places a large burden on the engine during power generation, impairing the vehicle's acceleration performance.

On the other hand, when the vehicle is decelerating, it is preferable to actively generate electricity to promote engine braking and to regenerate wasted energy into the battery.

However, the usage status of electrical components changes depending on the day and night or season, and if the power generation time is forcibly shortened for acceleration, it will be difficult to reduce the power generation time under conditions where the load on the generator, which uses many electrical components, is heavy. This may cause over-discharge of the battery or flickering of the lamp.
On the other hand, if the power generation time is forcibly extended during deceleration when no electrical equipment is used and the load on the generator is light, the battery may overcharge or the lamp may burn out.

Therefore, it is desirable to realize a regulator that can shorten the power generation time only when the vehicle is accelerating and the load on the generator is small, and lengthen the power generation time only when the vehicle is decelerating and the generator load is large. It is rare.

In view of the above requirements, the present invention aims to provide a regulator that appropriately controls the power generation time during power generation according to the load of the generator.

To explain the configuration of the present invention, the regulator is:
A switching means 41 that controls the field winding current of the vehicle charging generator 2 to maintain the output voltage of the charging generator 2 at the set voltage 5a, detects the conductivity of the switching means 41, and controls the switching means 41 according to the conductivity. a conductivity detection means 6 that generates an output signal, a vehicle running state detection means 7 that receives a pulsed voltage having a frequency proportional to the engine rotational speed, and detects at least one of acceleration and deceleration of the vehicle; Means 5 for generating a first set voltage as a reference set voltage in a constant speed state
1, 52, and generates a second set voltage lower than the first set voltage when the conductivity of the switching means 41 is below a first predetermined value and the vehicle is in an acceleration state. Means 54,
55, 57, 59, 61 and the conductivity is the second
set voltage generating means having at least one of means 53, 56, 58, and 60 for generating a third set voltage higher than the first set voltage when the voltage is at least a predetermined value and the vehicle is in a decelerating state. 5, comparing the magnitude of the set voltage 5a and the magnitude of the output voltage of the charging generator 2, and turning off the switching means 41 when the output voltage of the charging generator 2 is higher than the set voltage 5a; A conduction rate control means 42 is provided for turning on when the power is small and controlling the conduction rate of the switching means 41.

In the above configuration, when the conductivity of the switching means 41 is equal to or lower than the first predetermined value when the vehicle accelerates, it is determined that the load on the charging generator 2 is small, and the set voltage 5a of the charging generator 2 is set to the first predetermined value. The first set voltage is changed to a second set voltage lower than the first set voltage, and the power generation time becomes shorter. As a result, the load on the engine is reduced, so that the acceleration performance of the vehicle is not impaired, and since the load on the charging generator 2 at this time is small, there is no risk of over-discharge of the battery.

On the other hand, when the vehicle decelerates, the switching means 41
If the conductivity of is equal to or higher than the second predetermined value, it is determined that the load on the charging generator 2 is large, and the set voltage 5a of the charging generator 2 is set to a third set voltage higher than the first set voltage. The power generation time will be extended. In this way, active power generation is carried out to promote engine braking, and energy that would otherwise be wasted can be regenerated into a battery.
Since the load on the charging generator 2 at this time is large, overcharging of the battery does not occur.

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

In the figure, 1 is a battery, 2 is a charging generator, 3 is an electric load symbolically representing various electrical components, 4 is a voltage control circuit, 5 is a set voltage generation circuit, 6 is a conductivity detection circuit, and 7 is a rotation speed change 8 is a rotation speed detection circuit. The regulator is each circuit 4 above,
Consists of 5, 6, 7, and 8.

The charging generator 2 has an armature winding 21 and a field winding 2
2. Consists of a three-phase full-wave rectifier 23 and a field winding 22
When the armature winding 21 is excited, an electromotive force is generated in the armature winding 21, and power generation is performed. That is, the field winding 22
A rotor (not shown) around which the engine is wound is connected to the engine and rotates, and an alternating current voltage having a frequency proportional to the engine speed is generated in the armature winding 21. This AC voltage is rectified into DC by a rectifier 23 and applied to the battery 1 and load 3.

The voltage control circuit 4 includes a transistor 41 as a switching means, a comparator 42, and resistors 43 and 44.
The transistor 41
By controlling ON-OFF, the generator 2 is made to generate electricity intermittently, and the average generated voltage is set to the set voltage 5.
Keep it at a.

Terminal c of the conductivity detection circuit 6 is the transistor 41
The conduction state of the transistor 41 is detected by the level change of the collector voltage. Then, the average conductivity of the transistor 41 is calculated, and when the conductivity is below a predetermined lower limit value, a "1" level output is issued from terminal a, and when the conductivity is above a predetermined upper limit value, a "1" level output is issued from terminal b. Generates a "1" level output.

A terminal f of the rotational speed change detection circuit 7 is connected to one of the armature windings 21, and receives a pulsed voltage having a frequency proportional to the generator rotational speed, that is, the engine rotational speed. The change amount detection circuit 7 calculates the amount of change in the frequency, that is, the amount of change in the engine rotation speed,
If the amount of change is greater than a certain positive value, a "1" level output is generated from the terminal e, and if the amount of change is greater than a certain negative value, a "1" level output is generated from the terminal d.

The pulsed voltage proportional to the engine speed is similarly input to the rotation speed detection circuit 8, and the rotation detection circuit 8 outputs a "1" level when the rotation speed remains below a predetermined value for a predetermined period of time or more. emanate. The predetermined value is set to be slightly lower than the engine rotation speed when the vehicle is normally running.

The set voltage generation circuit 5 includes resistors 51, 52, 53,
54, delay circuit 55, AND gates 56, 57,
It consists of inverters 58, 59 and diodes 60, 61. The resistors 51 and 52 are connected in series between the power supply Vcc and the ground, and the voltage at the connection point becomes the set voltage 5a of the generating circuit 5. The output voltage of AND gate 56 and inverter 59 is "1" level and voltage Vcc
Therefore, it becomes 0V at the "0" level. Therefore,
When the output of the AND gate 56 is at the "0" level and the output of the inverter 59 is at the "1" level, the diodes 60 and 61 are both non-conductive, and the set voltage 5a is the voltage obtained by dividing the power supply Vcc by the resistors 51 and 52 ( (first set voltage). Inverter 59
When the output of the resistor 54 becomes "0" level, the diode 61 side of the resistor 54 is grounded and the output of the AND gate 56 also becomes "0" level, and the resistor 54 is connected in parallel to the resistor 52, and the set voltage 5a decreases (second set voltage). When the output of the AND gate 56 becomes "1" level, the resistor 53
The diode 60 side of the inverter 59 is connected to the voltage Vcc, and the output of the inverter 59 becomes "1" level, the resistor 53 is connected in parallel to the resistor 51, and the set voltage 5a increases (third set voltage). .

The delay circuit 55 changes the input level from "1" level to "0"
Even if the level is reached, a "1" level output is generated for a certain period of time.

The operation of the regulator having the above configuration will be explained below.

Since the engine speed hardly changes when the vehicle is running at a constant speed, the outputs of terminals d and e of the speed change detection circuit 7 are both at the "0" level.
The output of the AND gate 56 becomes "0" level.
In addition, the output of the AND gate 57 is "0" level,
The output of the inverter 59 becomes "1" level, and the set voltage 5a becomes the first set voltage (for example, 14.5 V) obtained by dividing the voltage Vcc by the resistors 51 and 52. The power generation interval of the generator 2 is controlled by the transistor 41 so that the generated voltage maintains the first set voltage.

When sudden acceleration is performed at the time of starting, the engine speed increases rapidly, and the terminal e of the rotation speed change detection circuit 7
The output becomes "1" level. In this state where the vehicle is not running normally, the output of the rotation speed detection circuit 8 is at the "1" level. At this time, when the load on the generator 2 is small and the average conductivity of the transistor 41 is small, the output of the terminal a of the conductivity detection circuit 6 becomes "1" level, and as a result, the output of the AND gate 57 becomes "1". level, and the output of the inverter 59 becomes "0" level. At this time, the outputs of terminals b and d are at the "0" level, and the output of the AND gate 56 is at the "0" level. As a result, the set voltage 5a
becomes a second set voltage (for example, 12V) lower than the first set voltage. If this second set voltage is set near the rated voltage of the battery 1, the generator 2 will hardly generate electricity, so there will be no load on the engine, and smooth acceleration will be achieved. Furthermore, since the load on the generator 2 is small, there is no adverse effect even if power generation is stopped during acceleration.

Note that if the load on the generator 2 is large during this acceleration, the output of the terminal a of the conductivity detection circuit 6 will be "0".
level, the outputs of AND gates 56 and 57 become "0" level, the output of inverter 59 becomes "1" level, and the first set voltage is maintained.

During deceleration, the engine speed rapidly decreases, and the output of the terminal d of the rotation speed change detection circuit 7 goes to the "1" level. At this time, if the load on the generator 2 is large and the average conductivity of the transistor 41 is large, the output of the terminal b of the conductivity detection circuit 6 will be at the "1" level, and the output of the AND gate 56 will be at the "1" level. The set voltage 5a is the third set voltage (for example, 15V) higher than the first set voltage. This lengthens the power generation time of the generator 2 and increases the braking force for the engine, while charging the battery 1 efficiently during heavy loads.

Note that if the load on the generator 2 is small during this deceleration, the output of the terminal b of the conductivity detection circuit 6 will be "0".
level, the outputs of AND gates 56 and 57 become "0" level, the output of inverter 59 becomes "1" level, and the first set voltage is maintained.

When the acceleration and deceleration are completed and the engine speed becomes constant, the set voltage 5a becomes the first set voltage again.

When the engine brake is applied during normal driving, the engine speed temporarily increases, but the output of the rotation speed detection circuit 8 is not at the "1" level, which is distinguished from the actual acceleration state.

Further, although the engine speed temporarily decreases due to gear change during acceleration, the set voltage 5a during acceleration is maintained by the delay circuit 55, so that acceleration performance is not impaired.

In the above embodiments, it is also possible to perform only one of stopping power generation during acceleration and charging the battery during deceleration. If the engine brake is sufficiently effective, the rotation speed detection circuit 8 is not necessary, and if there is no possibility that the acceleration performance will be significantly reduced, the delay circuit 55 is not necessary.

As described above, the charging generator control device of the present invention not only detects acceleration and deceleration of the vehicle, but also detects the load state of the generator from the conductivity of the switching element that controls power generation, and appropriately controls the power generation state. This improves acceleration performance and regenerates reactive energy during deceleration without adversely affecting the load, and the structure is simple.

[Brief explanation of the drawing]

The figure is a circuit diagram of the control device. 1... battery, 2... charging generator, 21...
Armature winding, 22... Field winding, 3... Electric load, 4... Voltage control circuit, 41... Switching transistor, 5... Setting voltage generation circuit, 6...
. . . conductivity detection circuit, 7 . . . rotation speed change amount detection circuit, 8 . . . rotation speed detection circuit.

Claims (1)

[Claims] 1 Switching means 41 for controlling the field winding current of the vehicle charging generator 2 to maintain the output voltage of the charging generator 2 at the set voltage 5a;
a conductivity detection means 6 which detects a conductivity of 1 and generates an output signal according to the conductivity; and a conductivity detecting means 6 which receives a pulsed voltage having a frequency proportional to the engine speed and detects at least one of acceleration and deceleration states of the vehicle. and means 51 and 52 for generating a first set voltage as a reference set voltage when the vehicle is in a constant speed state, and the conductivity of the switching means 41 is set to the first set voltage. means 5 for generating a second set voltage lower than the first set voltage when the voltage is below a predetermined value and the vehicle is in an acceleration state;
4, 55, 57, 59, 61, and means for generating a third set voltage higher than the first set voltage when the conductivity is at least a second predetermined value and the vehicle is in a deceleration state. 53, 56, 58, 60
A set voltage generating means 5 having at least one of
The magnitude of the set voltage 5a is compared with the magnitude of the output voltage of the charging generator 2, and the switching means 41 is turned off when the output voltage of the charging generator 2 is larger than the set voltage 5a, and when it is smaller than the set voltage 5a, the switching means 41 is turned off. A control device for a vehicle charging generator, comprising a conductivity control means 42 for turning on the switch means 41 and controlling the conductivity of the switch means 41.