JPS6223398A - Controller of vehicle generator - Google Patents

Abstract

PURPOSE:To stabilize the rotation of a machine and to save the fuel consumption of an engine by limiting a field current in response to the temperature detected value of a generator. CONSTITUTION:The transistor 304 of a voltage regulator 3 is turned ON or OFF by the compared result of a generator output voltage with a Zener diode 303 to control the field current of a field winding 102. A variable conductivity oscillator 8 outputs a pulse signal shortened in time of H level in response to the temperature rise of a generator 1. The transistor 304 is turned ON during the period of H level of this signal to forcibly limit a field current. A temperature detector 9 outputs a signal of H level when the temperature of the generator 1 is the set temperature or lower to limit the field current. Thus, the rotation of an engine can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a vehicle generator.

[Conventional technology]

FIG. 8 shows an embodiment of a conventional control device. In the figure, (1) is a four-generator driven by an engine E (not shown), an armature coil (10t), a field coil (1
02). (2) is a rectifier that performs full-wave rectification of the AC output of the generator, and the output end (201) (
202) and (208), (201) is an output terminal that outputs the main output, and (202) is used for excitation of the field coil (102) and voltage detection of the voltage regulator (3), which will be described later. (2o a) is the output end for grounding. (3) is a voltage regulator that adjusts the output voltage of the generator (1) to a predetermined value, and is composed of various parts described later. (1301) (802) is a voltage dividing resistor that divides the output voltage of the rectifier (2) @ (202), (+0
8) is a Zeme diode that detects the divided potential of the voltage dividing resistors (801) and (802) and is activated when it exceeds a predetermined value, and (804) is a Zeme diode that is activated when the Zeme diode (aOa) is activated. This is a conductive transistor, and controls the on/off of the transistor ω05), which will be described later. (s 05) is the transistor that controls the field coil (10) of the generator (1) intermittently, (a 06) is the base resistance of the transistor (805), (to 7) is the field coil of the generator (1) (102
) is a diode connected in parallel to absorb the intermittent surge of the field coil. (4) is the battery installed in the vehicle;
(5) is the vehicle's various electrical negative fronts, (6) is the key switch,
(7) is the field coil of the generator (1) (100 is the resistance for initial excitation. Figure 4 is a characteristic curve showing the output current and drive torque at full load of the generator by the conventional device. The broken line represents the cold time and the solid line represents the hot time.

Next, the operation will be explained. Starting engine Cζ (not shown)
When the key switch (6) is closed, the field coil (102) of the generator (1) is initially energized via the key switch (6) and the initial excitation resistor (7). Current flows and the generator (1) becomes ready to generate electricity.

Next, when the engine is started, the generator (1) starts generating electricity, and the voltage regulator (3) receives the output voltage from the output terminal (202) of the rectifier (2), and the output voltage is adjusted by the voltage dividing resistor (a). 01)
(a O2) and the Zemeder f-ode (808) exceed a predetermined value set in advance, the Zemeder diode (80B') is energized and the transistor (800) becomes conductive.Also, when the output voltage falls below the predetermined value, When the diode (a Oa) becomes non-conductive, the transistor (804) becomes non-conductive.This transistor (a o
4), the transistor (805) is controlled to be on/off, and the field coil (102) of the generator (1) is on/off to adjust the output voltage of the generator to a predetermined value Cζ. Like this 1
The ζ voltage regulator (3) repeats the above-mentioned operation no matter what state the generator is in, and the generator outputs the adjusted output voltage from the output terminal (2o t) of the rectifier (2) to the vehicle battery +41, Various electrical loads (5) are supplied with 1ζ tonne of power.

Figure 4 shows the characteristic curve of the output current and drive torque during cold and hot conditions of power generation (1) of the conventional device controlled as described above.In other words, the output current is The generator's self-heating peaks at 100 hrs, then gradually decreases as the ambient temperature rises, creating a hot curve.In addition, the generator's nominal output is determined by its interhour durability, and its cold characteristics are , it is only a margin for guaranteeing the characteristics when hot, and the ideal characteristics are best if the characteristics when cold and hot are the same.

The driving torque 1ζ of the -5 generator gradually decreases with a decrease in output current, peaking at a cold time, resulting in a curve at a hot time. The driving torque of this generator acts as a load on the vehicle's engine.

[Problem that the invention seeks to solve]

Since the conventional device operates as described above, as is clear from the above explanation, the difference between the cold drive torque and the hot drive torque creates an extra load on the engine, causing the engine to suddenly start running! 1
! Immediately after l, the torque generated by the engine is unstable,
Since the cold driving torque of the generator also has a large value, the influence of the driving torque is high and the engine rotation becomes unstable and lacks smoothness, and the fuel consumption of the engine is also high. Sara〔
ζ At extremely low temperatures, the above-mentioned degree of influence becomes even higher.

This invention was made to solve the above-mentioned problems, and provides a control system d for a vehicle generator that can suppress the cold driving torque of the generator without impairing the nominal output of the generator. The purpose is to obtain.

[Means for solving problems]

The control device for a vehicle generator according to the present invention detects the temperature of the destination Wt machine from the temperature detection wind ζ, and corrects and limits the field current using a variable conductivity oscillator according to the output of the temperature detector. be.

[Effect]

The variable conductivity oscillator in this invention Cζ corrects and limits the field current of the generator as the temperature of the generator increases according to the output of the temperature detector, and sequentially suppresses the output current of the generator.
This suppresses the driving torque of the generator.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, A1 of the voltage regulator (3) is the power supply, (808
) is the base resistance of the transistor (804), (809)
(810) is a backflow prevention diode, and (8) is a variable conduction rate oscillator, which is composed of various parts described later.
801) (SO is an inverter, (SOS) is a capacitor, (8o0 is a thermistor whose resistance value decreases as the temperature rises, and is attached to the heat generating part inside the generator or the generator together with the temperature detection element uO, which will be described later. Voltage regulator (3)
, a variable conductivity oscillator (8), and a temperature detector (9) to be described later.
It is attached to the control device including the generator and detects the temperature of the generator.

(s 05) (s 06) are resistors and capacitors (
s 08) and constitutes a differential circuit, (807) (
808) is a backflow prevention diode, (s09) is an inverter (80Ω input protection resistor, (s10) is a backflow prevention diode, and (9) is a temperature detector, which is composed of various parts described later. .

A2 is a power supply, (901> is a comparator, (902)
(9o a) is connected in series and the connection point is connected to the (→input of the comparator (901). By dividing the power supply voltage of A2, the voltage dividing resistor is used as the reference voltage of the comparator (901). has one end connected to the power supply A2, and the other end connected to a temperature detection element q and a comparator (9), which will be described later.
Temperature detection element connected to (g) input of 01);
This is a bias resistor.

ut'n is a temperature detection element, and in this embodiment, a negative temperature coefficient of one pressure in the forward direction of a diode is utilized.

Fig. 2 is a characteristic curve showing the output current and driving torque of the generator according to the present invention at full load. This represents the output current when the temperature is half-heated.

Next, the operation will be explained. The variable conductivity oscillator (8) utilizes a known unstable multivibrator using an inverter, and its operation is controlled by the voltage regulator (3)'s Zeme diode (aOS) being non-conducting and the temperature detector ( The following explanation will be made assuming that the output of the comparator (901) in 9) is at the 'H' level. First, if the output of the inverter (801) is at the 'H' level, the inverter (802)
The output is 1L level, and the capacitor (80B') is connected to the output terminal of the inverter (801)
), backflow prevention diode (s O7), thermistor (8
A differential circuit is constructed with the resistor (805) and the output terminal of the inverter (a02), and the potential at point a, that is, the inverter (
The input potential of 80) gradually decreases, and finally the input of the inverter (s O2) becomes the 'L level detection potential, the inverter (s O2) outputs the 'H level, and the inverter (s O2) outputs the 'H level'.
801) outputs 'L level. When the output is reversed, the capacitor (808) is connected to the output terminal of the inverter (802), the resistor (s O6), the backflow prevention diode (808),
The capacitor (808) and the output terminal of the inverter (s o 1) form a differentiating circuit in the opposite direction to the initial one, and at the same time as the reversal, the potential at point a is further lowered to ensure the input 'L level of the inverter (802). Stabilize operation. Next, the potential at point a gradually increases by the above-mentioned differentiating circuit, and finally,
When the input of the inverter (802) detects the 1H'' level, the inverter (80) outputs the 'L' level, the inverter (801) outputs the 'H' level and returns to the initial state. 01) is inverted from the initial state (ζ), and at the same time, the differentiating circuit of the capacitor (SOa) reverses to the initial circuit, and as a result, the potential at point a further increases, ensuring the input 1H'' level of the inverter (s02). Stabilizes the movement.

As is clear from the above explanation, the time for the output of the inverter (sol) to reach the ``H'' level is determined by the charging time constant of the capacitor (S Oa), thermistor (804), and resistor (s O5), and the time for the output of the inverter (sol) to reach the ``L'' level The time is the capacitor (80B
) and the charging time constant of the resistor (806).
ILL" time has different values, 1 in cold weather
The ratio of the 1H level to the cycle, that is, the conductivity, is set to a certain constant value, and as the temperature of the generator increases, the resistance value of the thermistor (804) decreases, so the time at the 1H level is gradually shortened. , the conductivity gradually decreases, and the above operation is repeated at the same time as the key switch (6) is closed.

Next, the operation of the variable conductivity oscillator (8) and the voltage regulator (3) will be explained assuming that the output of the temperature detector (9) is at the 'H' level.

First, when the Zeme diode (808) of the voltage regulator (3) is non-conducting and the output of the variable conduction rate oscillator (8), that is, the output of the inverter (SO1) is at 1H level, the transistor (804) From power supply A1 to base resistor (
a OS), a base current is supplied through the reverse current prevention diode (1310') and becomes conductive. Next, when the output of the variable conductivity oscillator (8) becomes 1L level, the base resistor (808) is grounded to the output terminal of the inverter (801) via the reverse current prevention diode (S10), and the transistor (804) is turned off. It becomes conductive. As described above, the output of the variable conduction rate oscillator (8) causes the transistor (804) to
is forcibly controlled intermittently regardless of the output voltage of the generator Sl@(11).In other words, the field coil (102
) is intermittent, and the field current is forcibly limited (ζ.On the other hand, the output of the generator is determined by the field magnetomotive force by the field coil 1ζ, so if the field current is limited, the output of the generator is limited. As a result, when the generator is in a cold state, as shown in the output current curve in Figure 2, the cold output stray current can be suppressed to the same level as the hot output current.However, when the generator starts generating electricity, When the temperature of the optoelectronic machine increases due to self-heating or a rise in ambient temperature, the coil resistance of the field coil (102) increases with temperature, and the field current decreases, resulting in the half-heating of the output current shown in Figure 2. As shown in the curve of However, since the conduction time of the transistor (80◇) of the voltage regulator (3), that is, the non-conduction time of the transistor (a O5) is shortened, the conductivity of the field coil (102) increases, and the field coil (102 ) increases, the drop in field current is suppressed, and as a result, the drop in output current of the machine is suppressed and corrected.

Also, if the electrical load on the vehicle is smaller than the limited output of the generator, the generator has sufficient power generation capacity and the output voltage increases, causing the voltage regulator (3) to exceed the predetermined regulated voltage. and the Zeme diode (808) conduct, and when the output of the variable conduction rate oscillator +81 is at the 'L' level, the transistor (a o 4) is made conductive and the output voltage of the generator (1) is adjusted to a predetermined value.Next The operation of the 1ζ temperature detector (9) and the temperature detection element (1■) will be explained. First, the temperature detection element opening (■) will be explained.
As mentioned above, the forward voltage generated by Cζ is output by flowing a small forward current by utilizing the negative temperature coefficient of the forward voltage of the diode. In other words, it utilizes the characteristic that the output voltage is high when the temperature is low and the output voltage is low when the temperature is high. The temperature detector (9) is a level detector of the temperature detection element σ■ using a comparator, and its operation is performed by connecting the voltage of the power supply A2 to the resistor (902
) and (908), the output voltage of the temperature detection element Gα is compared using the ninth partial voltage as a reference voltage.

In other words, when the temperature detection element (1 When the output voltage is lower than the reference voltage, that is, when the generator (1) is hot, the comparator (90
1) is configured to output L level. When the output of the comparator (901) is at the 1H level, the potential at the connection point between the base resistor (SOS) of the voltage regulator (3) and the backflow prevention diode (S10) is increased,
Transistor (80 yen intermittent is zeme diode (a
Oa) and the oscillation of the variable conductivity oscillator (8), %[
, /F level, the voltage regulator (3)'s base resistance (aOS>) and the reverse current prevention diode (810) connection point are lowered, and the transistor (a04) is disconnected only by the Zener diode (808). The operation is similar to that of a conventional voltage regulator.As is clear from the above explanation, the
During cold or semi-hot standby before the machine reaches a hot state, the output current of the generator is sequentially extracted and suppressed.
As shown by the characteristic curve ic in FIG. 2, the cold driving torque can be suppressed while properly guaranteeing the hot output, which is the nominal output of the generator.

In the above embodiment, the cold output current of the power generation 4, that is, the cold drive torque, is suppressed to match the hot output current, but the invention is not limited to this. It may be set to a value between hours. Further, in the above embodiment, a specific configuration example is shown in FIG. 1, but the present invention is not necessarily limited to this, and any means may be used as long as the same effect can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, when the temperature of the generator is below a certain level, the field current is corrected and limited as the temperature rises Cζ of the generator, so the cold output current of the generator is suppressed.
The cold driving torque can be suppressed and the load on the engine can be reduced without impairing the effective output of the photoelectric machine, which has the excellent effect of stabilizing the rotation of the ζ1 engine and saving the engine's fuel consumption. can get.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a control device according to an embodiment of the present invention, FIG. 2 is a characteristic curve of a generator according to the present invention, and FIG.
The figure is a circuit diagram showing a conventional control device, and FIG. 4 is a characteristic curve of a generator using the conventional control device. In the figure, (
1) is a generator, (3) is a voltage regulator, (8) is a variable conductivity oscillator, (9) is a temperature detector, and uo is a temperature detection element. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A control device that adjusts the output voltage of the generator by controlling the field current of the generator mounted on a vehicle includes a temperature detector that detects the temperature of the generator, and a temperature detector that detects the temperature of the generator. It also has a variable conductivity oscillator that limits the field current of the generator, and the variable conductivity oscillator corrects and limits the field current according to the output of the temperature detector. A control device for a vehicle generator.