JPS59106900A - Controller for automotive charging generator - Google Patents

Abstract

PURPOSE:To enable to suitably control a generating time by altering the set value of the output voltage of a generator in response to the running state of a vehicle and the load state of a generator. CONSTITUTION:A conduction rate detector 6 sets the terminal (a) to ''1'' level when the average conduction rate of a transistor 41 is lower limit value or lower and the terminal (b) to ''1'' level when it is the upper limit value or higher. A rotating speed variation amount detector 7 sets the terminal (e) to ''1'' level when the variation in the rotating speed of an engine is the prescribed positive value or higher and the terminal (d) to ''1'' level when it is the prescribed negative value or higher. A rotating speed detector 8 oututs a ''1'' level output when the rotating speed becomes the value slightly lower than the rotating speed at the normal running time for the prescribed period or longer. A set voltage generator 5 applies the first set voltage at the normal running time, the second set voltage lower than the first set voltage when the load of the generator 2 is smaller at the abrupt acceleration starting time, and the third set voltage higher than the first set voltage when the load of the generator 2 is large at the decelerating time to a voltage controller 4.

Description

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

The charging generator for J4L is connected to the engine, and the rotation speed is convenient over a wide range, so the teacher voltage is 131i.
A control device M (hereinafter referred to as a regulator) is provided to control to a constant value.

This Yuzu regulator usually controls the generated voltage by turning off the field winding current of the charging generator and causing the generator to energize intermittently.
As the load on the generator increases, the generation time is lengthened in order to maintain the generated rotational pressure constant.

Incidentally, the number of electrical components in vehicles has increased rapidly in recent years, and Chungtun & JL trains have also grown in size accordingly. and,
Large-capacity charging generators place a large burden on the engine during power generation, impairing vehicle 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 wasteful energy into the battery.

However, the usage status of electrical components changes depending on the night or season, and if the power generation time is forcibly shortened to avoid one acceleration, the battery capacity will decrease under conditions where the load on the so-called generator, which uses many electrical components, is heavy. On the other hand, if you are not using tJL accessories and the load on the generator is light, forcibly lengthening the generation time during deceleration may cause overcharging of the battery or burnout of the lamp. occurs.

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 load on the generator is large. It is rare.

The present invention has been made in view of the above-mentioned requirements, and includes detecting the acceleration/deceleration state of the vehicle by the amount of change in the rotational speed of the generator, and controlling the load state of the generator by controlling the field winding current. The present invention aims to provide a regulator that appropriately controls the power generation time by detecting the power generation rate and generating a set value of the generator output voltage according to the running condition of the vehicle and the load condition of the generator.

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

] is the battery, 2 is the charging/distributing branch, 3 is the electrical load symbolically representing each building's electrical equipment, 4 is the direct pressure control circuit, 5 is the setting chamber, pressure generation circuit, 6 is the conductivity detection circuit , 7 is a rotation speed change detection circuit, and 8 is a rotation speed detection circuit. The regulator is composed of each of the circuits 4.5.6.7.8 described above.

The charging generator 2 has an armature winding 21. When the field winding 22 and the three-phase full-wave rectifier 23 are formed and the field winding 22 is excited,
An electromotive force is generated in the armature winding 21, and power generation is performed. That is, a field (not shown) around the field winding 22 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 the load 3.

The voltage control circuit 4 includes a transistor 4 as a switching means.
1. A comparator 42 and a resistor 43.44 compare the pressure with the feedback 'of the generator generated voltage appearing between the set voltage 5a of the set voltage generation circuit 5 and the resistor 43.44, and set the transistor 41 to (T)N-OF. 'F
By performing 1tII control, the generator 2 is caused to generate power intermittently, and the average generated voltage is maintained at the set voltage 5a.

Terminal C of the conductivity detection circuit 6 is connected to the collector of the transistor 41, and detects the conduction state of the transistor 41 based on a change in the level of the collector voltage. Then, the average conductivity of the transistor 41 is calculated, and if the conductivity is less than a predetermined lower limit value, an "L" level output is generated from the terminal a,
If the conductivity is higher than the specified upper limit, the terminal is set to “1”.
Emit level output.

The terminal f of the gigantic 1 transshipment change detection circuit 7 is connected to one of the "Gikikomaki h' springs 21, and inputs a pulsed voltage with a frequency proportional to the generator rotation speed, that is, the engine 101 rotation speed. Change amount. The detection circuit 7 calculates the amount of change in the frequency, that is, the value of change in the number of revolutions per engine rotation, and if the amount of change is greater than a positive constant value, a terminal θ to υ "1" level output is output, and if the amount of change is negative, If it is above a certain value, A^1 child d! 1) rl
jL' generates a bell output.

Similarly, the pulsed voltage proportional to the engine 1f11 rotation speed is input to the rotation speed detection circuit 8.
emits a "K" level output when the rotational speed remains below a predetermined value for a predetermined period of time or longer.

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 path 55, A N D gate 56, 57, inverter 58, 59, and diode 60, 61. resistance 5
1.52 is 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. A N
The output voltage of the D gate 56 and the inverter 59 is
At the "1" level, the pressure becomes Vcc, and at the "O" level, the pressure becomes oV.
becomes.

Therefore, the output of the AND gate 56 is at rOJ level,
In addition, when the output of the inverter 59 is at the "1" level, both the diodes 60 and 61 become non-conductive, and the set voltage 5 is lowered.
a is the voltage obtained by dividing the power supply Vcc by the resistor 51.52 (the first
(set voltage). When the output of the inverter 59 reaches the "O" level, the resistor 52 and the resistor 54 are connected in parallel, and the set voltage 5a drops (second set voltage). When the output of the AND gate 56 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 outputs a "1" level output for a certain period of time even if the input changes from a "1" level to a "0" level.

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 cl and e of the speed change detection circuit 7 are both at the "0" level υ, A N D gate 5
The output of inverter 59 is at "0" level, and the output of inverter 59 is at "1" level.
'' level, and the setting voltage 5a becomes the first setting voltage (for example, 14.5V). The generator 2 then uses the transistor 41 to maintain the generated voltage at the first set voltage.
The power generation interval is controlled by

When a sudden acceleration is performed at the time of starting, the engine speed increases rapidly, and the output of the terminal e of the rotation speed change detection circuit 7 becomes rlJ.
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 of 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 inverter 59 becomes “
0'' level, and the set voltage 5a becomes a second set voltage (for example, 12■) lower than the first set voltage. This second
If the set voltage of is set near the rated voltage of battery 1,
Since the generator 2 generates almost no power, it does not place any load on the engine, and smooth acceleration is achieved. Furthermore, since the load on the generator 2 is small, there is no adverse effect even if power generation is stopped during acceleration.

During deceleration, the engine speed rapidly decreases, and the output of the terminal d of the speed change amount detection circuit 7 becomes "1" level. At this time, if the load of the generator 2 is large and the average conductivity of the transistor 41 is large, the output of the terminal of the conductivity detection circuit 6 becomes "1" V bell, and the output of the AND gate 56 becomes "1".
level, and the set voltage 5a becomes a third set voltage (for example, 15 cm) 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 efficiently charging the battery 1 during heavy loads.

When the acceleration and deceleration described above are completed and the number of engine rotations becomes constant, the set voltage 5a becomes the first set voltage again.

When engine braking is applied during normal driving, the engine speed increases temporarily, but the output of the rotation speed detection circuit 8 is
1" level, and is distinguished from the actual acceleration state.

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

As described above, the charging generator control device of the present invention detects the acceleration/deceleration of the vehicle based on the rotational speed of the generator, and also detects the load state of the generator based on the conductivity of the switching element that controls power generation, and determines the power generation state. By appropriately controlling the is also easy.

[Brief explanation of drawings]

The figure is a circuit diagram of the control device. l...Battery 2...Charging generator 21...Military armature winding 22...Field winding 3...Electrical load 4 ... Voltage control circuit 41 ... Nuwitching transistor 5 ...
... Setting voltage generation circuit 6 ... Continuity detection circuit 7 ... Rotation speed change detection circuit

Claims (2)

[Claims] (1) A switching means that controls the field winding current of the vehicle charging generator to maintain the output voltage of the generator at a set voltage, and detects the conductivity of the switching means and outputs an output signal according to the conductivity. The set voltage of the generator is set according to the output signals of the conductivity detection circuit that generates the electricity, the rotation speed change amount detection circuit that detects the rotation speed change amount of the charging generator, and the conductivity detection and rotation speed change amount detection circuit. A control device for a vehicle charging generator, comprising a set voltage generating circuit. (2) The set voltage generation circuit generates a voltage when the conductivity of the switching means is smaller than a predetermined range at the first set voltage, which is the reference set voltage, and the amount of change in the rotational speed of the charging generator is larger than a positive predetermined amount. A second set voltage lower than the first set voltage is generated, and the first set voltage is generated when f11* is larger than a predetermined range and the rotation speed adjustment is larger than a negative predetermined amount. The control device for a vehicle charging generator according to item 1 above, which generates a third set voltage that is higher than the specified voltage.