JPS5843146A - Device for protecting automotive battery - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle battery protection device that prevents undercharging or overcharging of a vehicle battery that is charged by a generator that generates electricity by being rotated by an engine.

Generally, when a battery is overcharged, its lifespan is significantly shortened, and the battery fluid decomposes into water, resulting in an extreme increase in the number of fluid replacements.

Therefore, in order to prevent overcharging of a battery installed in a vehicle such as a car, it is possible to lower the charging voltage by lowering the regulating voltage of the regulator. I'm afraid of triggering it.

Conventionally, such battery overcharging and battery v
An example of a vehicle battery protection device that completely prevents damage is disclosed in Japanese Patent Laid-Open No. 127618/1983.

This system measures the internal impedance of the battery using a full charge detection circuit, and if it detects that the battery is fully charged, lowers the regulation voltage of the regulation circuit that regulates the voltage generated by the alternator. If the battery is insufficiently charged, the adjustment is increased to prevent overcharging and battery drain.

However, in such conventional vehicle battery protection devices, the regulated voltage is simply lowered only when the battery is fully charged, and conversely, the regulated voltage is simply raised when the battery is insufficiently charged. The charging voltage, that is, the amount of power generated by the alternator, is determined by the state of charge of the alternator, but an increase in the amount of power generated naturally means an increase in the load on the engine, especially in the idle state, when the engine speed becomes lower than the rated value. In this case, the generated voltage does not increase and the initial objective of increasing the amount of charge cannot be achieved.

Additionally, during overcharging, the generator operates to lower the generated voltage, resulting in a reduction in the power generation load and an increase in the idle rotation speed, resulting in a problem of poor fuel efficiency during idle operation.

This invention has been made in view of the above points, and detects the full state of charge of the battery, and when the battery is undercharged, the amount of power generated by the generator for charging the battery increases, and conversely, when it is overcharged, the amount of power generated is increased. In addition to controlling the idling speed of the engine to reduce the engine speed, the engine speed is increased when the engine speed decreases due to an increase in power generation, and conversely, the speed is lowered when the engine speed increases due to a decrease in power generation. In this way, it is possible to provide a vehicle battery protection device that solves the conventional problems.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and also shows a part of the engine mechanism as a sectional view.

First, to explain the configuration, 1 is a battery, 2 is a generator, and when a rotor (not shown) is rotated within the stator by starting the engine, an alternating current voltage is generated in the stator coil SC, which is rectified by a diode group D1. terminal B
DC voltage is output to charge the battery 1.

In addition, the AC voltage generated in the stator coil sc is also rectified by a diode group: D, and the low lK winding 1
．． It self-supplies a DC voltage to flow current to the field coil (rotor coil) EC.

Reference numeral 3 denotes a voltage regulator for fully adjusting the amount of power generated by the generator 2, that is, the output voltage, and controls the current flowing through the field coil FC of the generator 2 in accordance with the output voltage from the terminal B.

Further, a changeover switch 4 and a resistor R1' selectively inserted by the changeover switch 4 are connected in series between the 7th side of the field coil FC of the generator 2 and the G point on the voltage regulator 3 side.

The battery 1 receives a detection signal sl output from the battery charge state detector 5 to detect its state of charge.
is input to the base of transistor 8, which drives relay 6.7, and to controller 9, which controls the idle link speed of the engine.

Furthermore, when the battery 1 is in an overcharged state, the detection signal s2 output from the battery charging state detector 5 is transmitted to the relay 6.
It is input to the base of transistor 11 that drives transistor 10 and to controller 9 .

The switching contact of the relay 6 is connected to the field coil F of the generator 2.
It is inserted in series with the current-carrying circuit of C.

The contact of relay 7 is connected to resistor R by inserting it in series with resistor R2'fc.
3 are connected in parallel. Further, the contact point of the relay 10 is connected in parallel to the resistor R5 through the resistor R4k inserted in series. The resistor R3 and the resistor R5 divide the generated voltage of the generator 2 and apply it to the Zener diode ZD of the voltage regulator 3.

Note that 12 is an ignition switch that is turned on when starting the engine, and 13 is a charge lamp that lights up while waiting for startup and turns off after charging starts.

On the other hand, the output cover of the controller 9 is referred to as Vakinim Control Pulp (hereinafter referred to as TTVCM, valve).

) 1jl via auxiliary air control pulp (hereinafter referred to as “
AAC valve (abbreviated as “AAC valve”) 15 is controlled. That is, the negative pressure of the 70M pulp 14 causes the AAC pulp 15 to
is controlled, and the bypass passage 1 of the throttle chamber 16 is controlled.
7, the amount of intake air during idle link is controlled, and the idle link rotational speed is controlled. Furthermore, a switch 18 is connected to the controller 9, which is turned on by detecting the idle state of the engine.

In this embodiment, the transistor 8.11, the relay 6.7.10, and the resistor R2, Ra are the power generation side leg means, and the controller 9. VCM pulp 14 and AAC
Valve 15 is idling rotation control means.

Next, the operation of this embodiment will be explained.

The changeover switch 4 is a switch that is activated depending on the driving state of the vehicle, and is linked to, for example, the brake. The generator 2 is activated by operating the changeover switch 4.
The control current of the voltage regulator 6 for the field coil FC changes, the voltage generated by the generator 2, that is, the voltage at the terminal B changes, and the amount of power generation changes accordingly. Thereby, the input energy from the engine that rotates the generator 2 is changed, and the engine load is changed depending on the operating conditions of the vehicle, thereby improving fuel efficiency.

・') In this system, when the battery charging state detector 5 detects an insufficient charging state in which the remaining capacity has decreased to a predetermined value as the charging state of the battery 1, the signal 81 is set to a high level "H". , the transistor 8 is turned on and the relay 6°7 is energized.

When the relay 6 is energized, it switches its contacts so as to directly connect it to the field coil FCffi voltage regulator 3 regardless of the changeover switch, and the relay 7
When energized, the contact is turned on so that the resistor R2 is connected in parallel to the resistor R3, thereby reducing the voltage applied to the Zener diodes Z and D. Thereby, the voltage regulator 6 operates to increase the current flowing through the field coil FC, so that the generated voltage of the generator 2, that is, the voltage at the B terminal increases.

At the same time, the controller 9 receives the "H" signal Sl'fc from the battery charge state detector 5, and if the switch 18 for detecting the state of drink is on at this time, the controller 9 receives an off signal "4. , and the 76M pulp 141 operates to close the negative pressure passage to the AAC valve 15. Thereby, the AAC valve 15 opens the bypass passage 17. Therefore, the amount of intake air increases, the engine speed increases, and the rotation speed of the rotor of the generator 2, which is belt-driven from the engine crankshaft, also increases.

Of course, the idle link rotation speed at this time may be the minimum rotation speed for the generator 2 to generate a predetermined voltage necessary for restoring the charging state of the battery 1. That is,
It is only necessary to prevent the engine's idle speed from decreasing due to an increase in the amount of power generated, and high-speed rotation is not required.

On the other hand, when the overcharged state of the battery 1 is detected by the battery charging state detector 5, the signal S'2 goes to a high level "H".
", transistor 11 turns on, and relay 6 and relay 10 operate.

When the relay 6 is activated, the contact switches to directly connect the field coil FC full voltage to the regulator 6 regardless of the setting of the changeover switch 4, which is exactly the same as when the battery 1 is not fully charged. In Although,
When the relay 10 is activated, its contact is turned on, and a resistor R4 is connected in parallel to one resistor R5 that divides the generated voltage of the generator 2. Therefore, the voltage applied to the Zener diode ZD fluctuates.

Thereby, the voltage regulator 3 operates to reduce the current flowing through the field coil FC. As a result, the voltage generated by the generator 2 decreases.

At the same time, the controller 9 receives the ``H'' signal 82k from the battery charge state detector 5, and controls the 70M pulp 14 and transfers the signal to the AAC pulp 15 when the switch 18 is in the idle state. It operates to increase the negative pressure, close the bypass passage 17, reduce the amount of intake air, and lower the idling rotation speed of the engine.

As described above, according to the present invention, a charge state detector is provided to detect the state of charge of the battery, and while monitoring the state of charge of the battery, the battery is charged when the remaining capacity is low, that is, when the charge is insufficient, and when the battery is overcharged. In the idle state, it discharges and controls the amount of power generated by the generator, and in the idle link state, the idle link rotation speed is controlled according to the charging state of the battery, ensuring that the battery is not undercharged or overcharged. In addition, it is possible to improve fuel efficiency by preventing the rotation from increasing or decreasing during idling.

Furthermore, according to the present invention, there is no need to worry about insufficient remaining capacity due to over-discharge of the battery, and the battery only needs to be used for the most part when starting the engine, so it is possible to make the battery smaller and lighter. , the battery is no longer exposed to an overcharged state for a long time, and electrolysis of the liquid is reduced, so the number of times water is refilled can be reduced.

[Brief explanation of the drawing]

The figure is a circuit diagram including a partial cross-sectional view of an engine mechanism showing an embodiment of the present invention. 1... Battery 2... Generator 3... Voltage regulator and regulator 5... Battery charge status -゜detector 6, -7. 10... Relay, 9... Controller 1
2...Ignition switch 14...Vacuum control pulp (70M
Pulp 15°°・Auxiliary air control valve (AA
C] (Lube) 16...Throttle chamber

Claims (1)

[Claims] 1. A vehicle battery that is charged by a generator that generates electricity by rotating the engine, a battery charging state detector that detects the charging state of the battery, and a detection signal from the battery charging state detector. a power generation amount control means that increases the amount of power generated by the generator when the battery is undercharged and reduces it when the battery is overcharged; What is claimed is: 1. A battery maintenance device for a vehicle, comprising: idle rotation control means for fully controlling idling rotation.