JPH0333199Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling the power generation state of a vehicle generator.

Conventional generators charge the battery by supplying the generated voltage to the battery when the generated voltage is within a predetermined voltage range (for example, 12V to 14V). In the above cases, the generated voltage is not supplied to the battery. However, conventional generators generate power regardless of changes in operating conditions (for example, acceleration conditions and load conditions), and generate power when the vehicle accelerates, or do not generate power when the vehicle decelerates. I'm doing it.

Therefore, not only is it not possible to bring out the full operating performance, but also the conversion from mechanical energy to electrical energy is not carried out properly, resulting in a waste of energy and a problem of poor energy efficiency.

Therefore, it is conceivable to generate power only when the vehicle is not accelerating, or only when the vehicle is decelerating, but with the former method, power is generated all the time during steady driving, so the total amount of power generated is There is a problem in that the time becomes longer, which causes a deterioration in fuel efficiency due to an increase in load, and the latter method has the problem that the power generation stop time becomes too long, thereby causing an overdischarge state.

The present invention attempts to solve these problems by controlling power generation to be stopped for a predetermined period of time when switching from an idle state to a non-idle state, thereby preventing over-discharge and reducing fuel consumption. It is an object of the present invention to provide a generator control device for a vehicle that is improved.

Therefore, the vehicle generator control device of the present invention is
A generator having an armature and a field coil and driven by a vehicle engine, a battery electrically connected to the armature to be charged, and connected to an electrical connection point between the armature and the battery. A voltage dividing circuit section in which a voltage dividing point is formed in the middle by a voltage dividing resistor, a determination section that determines whether the voltage at the voltage dividing point exceeds the set value, and a determination section that determines whether the voltage at the voltage dividing point exceeds the set value. a regulator having an energization control unit that limits energization to the field coil when the determination unit determines that the field coil has been exceeded; a detection unit that detects switching between an idle state and a non-idle state of the engine; a timer means for outputting a control signal for a predetermined period of time after the switching from the idle state to the non-idle state is detected by the above; The device is characterized in that it is provided with a switching means that switches depending on the presence or absence, and is configured such that the voltage at the voltage dividing point increases when the control signal is generated.

Hereinafter, a vehicle generator control device as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is an electric circuit diagram thereof, and FIG. 2 is an electric circuit diagram showing a main part of a modification thereof.

As shown in FIG. 1, a generator 26 equipped with an armature 1 is provided to be driven by an engine of a vehicle (not shown), and the generated voltage is supplied to a battery 3 via a commutator 2. It's becoming like that.

The power generation state (on/off in this case) of the generator 26 is controlled by the field coil 4.

The positive end of the field coil 4 is connected to the battery 3 via a key switch 5 and a charge lamp 6, and is also connected to the armature 1 via a commutator 7, while its negative end is connected to ground via a regulator 8. has been done.

The regulator 8 is a voltage dividing circuit that is interposed between the electrical contact between the armature 1 and the battery 3 and the earth E, and has a voltage dividing point C formed in the middle by voltage dividing resistors 14 to 17. , Zener diode 1 that turns ON when the voltage at voltage dividing point C exceeds the set value
8, a transistor 19 for restricting energization to the field coil 4 when the voltage at the voltage dividing point C exceeds the set value (when the voltage at the voltage dividing point exceeds the set value), 20 and 21, and this regulator 8
receives a determination voltage (in this case, two different voltages) from a determination voltage supply circuit 9, as will be described later.

Additionally, this vehicle is equipped with a throttle idle opening detection switch (hereinafter referred to as "idle switch") DE that is turned on when the throttle opening is at idle and turned off at other times. , this allows this idle switch
By switching DE on and off, it is possible to detect switching between an idle state and a non-idle state of the engine.

Furthermore, the detection signal from the idle switch DE is supplied to a timer circuit 11, and this timer circuit 11 is connected to the idle switch DE.
After receiving a detection signal indicating switching from an idle state to a non-idle state (specifically, a signal switching from an on state to an off state) from the DE, the on signal is output for a predetermined period of time (for example, 10 to 30 seconds). This is what is output.

The timer circuit 11 is connected with a transistor 12 that also constitutes the determination voltage control circuit 10. Therefore, the timer circuit 11
When an on signal is output from transistor 1, transistor 1
2 becomes conductive, and terminal A is grounded.

When terminal A is grounded, the base of transistor 13 constituting judgment voltage supply circuit 9 is grounded, transistor 13 becomes non-conductive, and terminal b becomes open (that is, not connected to anything). .

By opening terminal B, resistors 14 to
17 (respectively resistance values R ₁ to R ₄ )
is divided, and the following voltage Vc (voltage
Vc is the voltage at terminal C when terminal B is grounded
Higher than Vc′ (described in detail later) is applied.

Vc=Va・{(R ₃ +R ₄ )/(R ₁ +R ₂ +R ₃ +R ₄ )} Voltage Vc (14>Vc>12 [V]) is set larger than the breakdown voltage Vz of the Zener diode 18 Therefore, transistor 19 becomes conductive (turned on) due to the Zener effect, thereby turning off transistors 20 and 21.

By turning off the transistors 20 and 21, the terminals D and E are opened, and the negative terminal of the armature 1 becomes the voltage Va, so no field is generated.
As a result, power generation is not performed.

In this way, power generation is stopped for a predetermined period of time immediately after the idle switch DE is turned off. Note that after a predetermined period of time has elapsed, an off signal is output from the timer circuit 11, and the transistor 12 is turned off.
becomes non-conductive, terminal A is opened, transistor 13 is turned on, and by being turned on, terminal B is grounded and the following voltage Vc' is applied to terminal C.

Vc′=Va・{R ₃ /(R ₁ +R ₂ +R ₃ )} Since voltage Vc′ is smaller than voltage Vc, the Zener effect does not occur, transistor 19 is turned off, transistors 20 and 21 are turned on, and the terminal D and terminal E are short-circuited, current flows through field coil 4, and power generation is thereby performed.

Breakdown voltage Vz is set to an appropriate value between voltages Vc and Vc'.

By the way, when the throttle opening becomes the idle opening again and the idle switch DE turns on, the clock measurement action by the timer circuit 11 is canceled, so an off signal is output from the timer circuit 11, which stops the power generation. It is done.

In addition, as shown in FIG. 2, the vehicle speed sensor 22,
A comparator 24, an AND circuit 25, etc. are attached, and when the vehicle speed detected by the vehicle speed sensor 22 is less than a certain low speed value (set to a small value), the idle switch DE is turned off. However, it is also possible to generate electricity, thereby preventing overdischarge. That is, a vehicle speed signal is input from the vehicle speed sensor 22 to the comparator 24, and a reference signal corresponding to the low speed value is input from the reference signal source 23. Outputs an off signal (low level signal) when the signal is off, otherwise outputs an on signal (high level signal)
is now output. Therefore, the second
As can be seen from the figure, when the vehicle speed is below the above-mentioned low speed value, regardless of the signal from the timer circuit 11, the AND circuit 25 outputs an off signal, so power generation is always performed.

On the other hand, when the vehicle speed increases, the AND circuit 25 is turned on and off depending on the signal from the timer circuit 11.

Note that instead of using the throttle switch DE, it is also possible to detect switching between the idle state and the non-idle state of the engine from the state of the accelerator pedal.

Further, the time measured by the timer circuit 11 can be automatically adjusted to the optimum time depending on the discharge state of the battery and the operating state. Of course, the time measured by the timer circuit 11 can also be changed manually.

As described in detail above, according to the vehicle generator control device of the present invention, the following effects and advantages can be obtained with a simple configuration using a detector and a timer circuit.

(1) When driving in urban areas where there is a lot of acceleration and deceleration, power generation is stopped for most of the time except when decelerating or idling, which significantly reduces fuel consumption.

(2) After switching from the idle state to the non-idle state, power generation is stopped for a predetermined period of time, but after that, power generation continues, so there is no risk of overdischarge.

[Brief explanation of drawings]

The figure shows a vehicle generator control device as an embodiment of the present invention, and FIG. 1 is its electrical circuit diagram;
FIG. 2 is an electrical circuit diagram showing the main parts of the modified example. 1... Armature, 2... Commutator, 3... Battery, 4... Field coil, 5... Key switch, 6... Charge lamp, 7... Commutator, 8...
...Regulator, 9...Judgment voltage supply circuit, 10
... Judgment voltage control circuit, 11 ... Timer circuit, 1
2, 13... Transistor, 14-17... Resistor, 18... Zener diode, 19-21...
...Transistor, 22...Vehicle speed sensor, 23...
Reference signal source, 24... comparator, 25... AND circuit, 26... generator, DE... idle switch as a detector.

Claims (1)

[Scope of utility model registration request] A generator 26 that has an armature 1 and a field coil 4 and is driven by the vehicle engine, a battery 3 that is electrically connected to the armature and is charged, and an electrical connection point between the armature and the battery. A voltage dividing circuit section connected to the voltage dividing circuit section in which a voltage dividing point C is formed in the middle by voltage dividing resistors 14, 15, 16, and 17 and a judgment to determine whether the voltage at the voltage dividing point exceeds a set value. A regulator 8 having a section X and an energization control section Y that limits energization to the field coil when the determination section determines that the voltage at the voltage dividing point exceeds a set value; Detection means for detecting switching to and from non-idle state
DE, timer means 11 for outputting a control signal for a predetermined period of time after the detection means detects the switching from the idle state to the non-idle state; A switching means 13 is provided which switches depending on the presence or absence of a control signal from the means 11,
A generator control device for a vehicle, characterized in that the voltage at the voltage dividing point increases when the control signal is generated.