JP2001219798A - Battery circuit device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery circuit device for a vehicle without temporarily stopping accessories. SOLUTION: The battery circuit device comprises a key switch 1 for exchanging between a first position where power of an on-vehicle battery 4 is supplied to accessories 3 and a second position where the power of the on-vehicle battery 4 is supplied to the accessories 3 and a starter motor 2, and a storage means 10 that is provided in a power supply line 6 between the key switch 1 and the accessories 3, sores power when supply voltage of the on-vehicle battery 4 is higher than a predetermined value, and supplies power to the accessories 3 when supply voltage of the on-vehicle battery 4 is lower than the predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery circuit device for a vehicle for supplying power to a starter motor and accessories mounted on a vehicle, and more particularly to a battery for a vehicle in which the accessories are not temporarily stopped. The present invention relates to a circuit device.

[0002]

2. Description of the Related Art Vehicles such as automobiles are equipped with auxiliary devices such as a radio, a navigator, an audio device, and a wireless device for providing comfort during riding. On the other hand, when the vehicle is started, the engine is started by the starter motor, and at this time, the battery voltage is greatly reduced by the starting current. Therefore, the operation of such auxiliary devices may be temporarily stopped due to the voltage drop.

FIG. 2 is a circuit diagram of a conventional vehicle starting circuit. When starting the engine, the driver turns off (OFF) the key switch 1 which is a slide switch → accessory (AC
C) → Ignition (IG) → Start (ST) and turn by hand.

In each position, the position of the accessory is a position where the auxiliary equipment 3 such as an audio system or a navigator is operated when the engine is stopped. Further, the ignition position is a position at which the engine is operated. The start position is a position where power is supplied to the starter motor 2 to start the engine. At the start position, there is also a type in which the power supply to the accessory is intentionally cut off because the battery voltage drops.

In such a conventional vehicle starting circuit, when the engine is started by the starter motor 2 at the start position, the battery voltage of the battery 4 is greatly reduced by the starting current.

FIG. 3 is a graph showing the characteristics of the battery voltage drop. The vertical axis shows the voltage and the current, and the horizontal axis shows the passage of time. In the figure, the dotted line indicates the battery voltage, the solid line indicates the current at the input position A of the key switch, and the lower time chart corresponds to the position of the key switch. When the key switch 1 is set to the start position and electric power is supplied to the starter motor 2, the battery voltage indicated by the dotted line temporarily decreases greatly.

[0007] Generally, a threshold value at which auxiliary devices such as a radio, a navigator, an audio device, and a radio device operate is set to 6 V.
The operation stops temporarily. In the figure, the shaded area is
It shows the inoperable area of accessories.

[0008] In a conventional vehicle, since the key switch is hardly turned off during traveling, it is not a serious problem that auxiliary devices such as an audio device and a navigator are cut. However, in an idle stop vehicle equipped with an idle stop automatic start / stop device that has been planned in recent years, the starter motor 2 operates many times during riding, and each time, the radio and the navigator become inaudible, In some cases, the program was cut off and returned to the initial screen.

In the navigator, when the screen returns to the initial screen, it is necessary to redo the setting for the destination by operating the keyboard, which is inconvenient.

[0010]

In a conventional vehicle starting circuit having such a configuration, in an idle stop vehicle, every time the engine is started, auxiliary devices such as a radio, a navigator, an audio device, and a radio device are turned on at the time of starting. There is a problem that the operation is temporarily stopped due to the decrease in the battery voltage.

In particular, in the navigator, every time the engine is started, the screen disappears and returns to the initial screen. When the screen returns to the initial screen, it is necessary to set the destination again by operating the keyboard. There was a problem that it became inconvenient.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a vehicle battery circuit device in which auxiliary devices are not temporarily stopped.

[0013]

A vehicle battery circuit device according to the present invention is a vehicle battery circuit device for supplying power to a starter motor and accessories mounted on a vehicle. A key switch for switching between a first position for supplying power to the vehicle and a second position for supplying power of the vehicle battery to the auxiliary device and the starter motor; and a power supply line between the key switch and the auxiliary device. Power storage means for storing power when the supply voltage of the vehicle-mounted battery is higher than a predetermined value, and supplying power to accessories when the supply voltage of the vehicle-mounted battery becomes lower than the predetermined value. ing.

Further, there is further provided a backflow prevention means provided between the key switch of the power supply line and the power storage means, and for limiting a power supply direction from the key switch to only the power storage means.

[0015] The power storage means is a capacitor connected to a power supply line.

Further, the capacitor has a plurality of capacitors connected in series, and a diode for equalizing the voltage stored in each capacitor is connected in parallel to each capacitor.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a circuit diagram showing a vehicle battery circuit device according to the present invention. A key switch 1, which is a slide switch having the same structure as that of the related art, supplies electric power of a battery 4 to an auxiliary device 3 such as a radio, a navigator, an audio device, or a wireless device at an accessory position as a first position.

Further, at the ignition position, the electric power of the battery 4 is supplied to the ECU and other electric loads. Further, at the start position, power is supplied to the starter motor 2 to start the engine.

In this embodiment, the key switch 1
A power storage means 10 for storing power in a power supply line 6 between the power supply unit 6 and the auxiliary devices 3 is provided. The power storage means 10 stores power when the supply voltage of the battery 4 is higher than a predetermined value, and supplies power to the accessories 3 when the supply voltage of the battery 4 becomes lower than the predetermined value. That is, auxiliaries 3
Is supplied with power from both the battery 4 and the power storage means 10 when the supply voltage of the battery 4 becomes lower than a predetermined value.

As described above, the present embodiment eliminates the problem that the operation of the auxiliary devices 3 is temporarily stopped. The power storage means 10 is a compensation circuit that compensates for the power supplied to the auxiliary devices 3 as described above.

The power storage means 10 comprises a capacitor 10a connected between the power supply line 6 and the ground. The capacitor 10a has a plurality of capacitors connected in series. Each capacitor 10a has a diode 1 for equalizing the voltage stored in each capacitor.
0b are connected in parallel.

The key switch 1 of the power supply line 6
A diode 10c is further provided between the switch and the connection position of the capacitor 10a as backflow prevention means for restricting the power supply direction from the key switch 1 to only the capacitor 10a.

By providing the diode 10c as the backflow preventing means, the current does not flow backward from the power storage means 10 in the direction of the key switch 1, and the reliability of the device is improved.

In the present embodiment, a capacitor is used as the power storage means. However, the power storage means only needs to be capable of repeating charging and discharging. For example, a nickel cadmium battery called a secondary storage battery is used. And so on.

[0025]

The vehicle battery circuit device according to the present invention is a vehicle battery circuit device for supplying power to a starter motor and accessories mounted on a vehicle, and supplies electric power of a vehicle battery to the accessories. A key switch for switching between a first position and a second position for supplying electric power of the vehicle-mounted battery to the auxiliary device and the starter motor, and a power supply line provided between the key switch and the auxiliary device; Power storage means for storing power when the supply voltage of the battery is higher than a predetermined value, and supplying power to auxiliary devices when the supply voltage of the vehicle-mounted battery is lower than the predetermined value; Therefore, the auxiliary equipment does not stop temporarily.

Further, there is further provided a backflow preventing means provided between the key switch of the power supply line and the power storage means, for limiting the power supply direction from the key switch to the power storage means only. Therefore, the current does not flow backward from the power storage means in the key switch direction, and the reliability of the device is improved.

The power storage means is a capacitor connected to a power supply line. Therefore, the device can be realized at a low cost with a compact configuration.

Further, the capacitor has a plurality of capacitors connected in series, and a diode for equalizing the voltage stored in each capacitor is connected in parallel to each capacitor. Therefore, it is possible to prevent the power storage capacity from becoming unstable due to the deterioration of the capacitor, and the reliability of the device is improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a vehicle battery circuit device of the present invention.

FIG. 2 is a circuit diagram of a conventional vehicle starting circuit.

FIG. 3 is a graph showing a decrease characteristic of a battery voltage.

[Explanation of symbols]

1 key switch, 2 starter motor, 3 auxiliaries,
4 battery (vehicle battery), 10 power storage means, 10
c Diode (backflow prevention means), 10a capacitor, 10b diode.

Claims (4)

[Claims] 1. A vehicle battery circuit device for supplying power to a starter motor and accessories mounted on a vehicle, wherein a first position for supplying power of the vehicle battery to the accessories and a power of the vehicle battery are provided. A key switch for switching between the accessory and the second position to be supplied to the starter motor; and a power supply line between the key switch and the accessory, the supply voltage of the vehicle-mounted battery being A vehicle for storing power when the voltage is higher than a predetermined value, and for supplying power to the auxiliary devices when the supply voltage of the on-vehicle battery is lower than the predetermined value; Battery circuit device. 2. The power supply line further comprising backflow prevention means provided between the key switch and the power storage means for limiting a power supply direction from the key switch to the power storage means only. The vehicle battery circuit device according to claim 1, wherein 3. The vehicle battery circuit device according to claim 1, wherein the power storage means is a capacitor connected to the power supply line. 4. The capacitor according to claim 1, wherein a plurality of capacitors are connected in series.
4. A diode for equalizing the voltage stored in each capacitor is connected in parallel with each other.
A battery circuit device for a vehicle as described in the above.