JPH0633854A - Storage battery device for automobile - Google Patents

Abstract

PURPOSE:To obtain a storage battery for two power source type automobile through the little improvement of the storage battery device for one power source three system type automobile. CONSTITUTION:A storage battery device is equipped with a main storage battery BL connected with all the on-vehicle loads, preparatory storage battery BS, and an electromagnetic switch circuit Z connected between the storage battery BL and the preparatory storage battery BS, and when the voltage of the main storage battery BL on the start of an engine lowers over a certain voltage in comparison with the voltage of the preparatory storage battery BS, the main storage battery BL and the preparatory storage battery BS are put into a parallel connection state for a certain time, and electric current flows from the preparatory storage battery BS to the main storage battery BL.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage battery device for automobiles.

[0002]

2. Description of the Related Art A storage battery circuit for automobiles today has one power source and three power sources.
Lineage is common. That is, one storage battery is connected to each circuit for starting, ignition, and other loads. According to this, in combination with the improvement in reliability of electric components such as a starter and an alternator, stable electricity can be supplied from the alternator to various loads after the engine can be started. Therefore, the storage battery is rarely discharged regardless of whether the vehicle is running or idling.

However, no matter how the reliability of the electrical equipment is improved, the engine cannot be started any longer when the life of the storage battery is reached. If the battery life can be accurately detected and the battery can be replaced properly, the reliability of engine start will be higher, but since the battery is an electrochemical device, it will be greatly affected by the ambient temperature and maintenance handling. Therefore, a reliable method for determining the life is not established at present. Therefore, if the engine suddenly becomes unable to start one day, there will be a problem.

Apart from the life of the storage battery, even if the capacity of the storage battery is exhausted, the engine still cannot be started. A load such as an automobile lamp is connected to the storage battery with a dedicated switch, and can be arbitrarily turned on regardless of whether the key switch is ON or OFF. Therefore, if you forget to turn off these lamp switches, the storage battery will continue to discharge even if the key switch is turned off. The main lights are equipped with an alarm device to prevent mistakes in turning off the lights, but room lamps, parking lights,
No warning device is installed on the lighting lamps in the trunk. Therefore, if these are forgotten to be erased, the storage battery will be completely discharged and the engine cannot be started. In addition, various memories and loads such as clocks are directly connected to the storage battery, and the memory is always retained even if the key switch is turned off. This holding current varies depending on the type of vehicle, but it is 50 mA from 5 mA in most cases. If it is constantly discharged with this current, it may be in a completely discharged state in about 2 to 6 months.

When the automobile engine cannot be started due to the above reasons, it does not cause a serious problem in a place where the service network is located, but it can become a serious problem in a place where the service network is not located.

A so-called switch storage battery has been proposed as a measure against the problem of engine starting caused by the storage battery. This is to provide an emergency spare storage battery in addition to the storage battery that is always used, and cope with an emergency by switching the circuit connection. However, this has a problem that weight efficiency and volumetric efficiency are deteriorated because it is necessary to always mount an unused spare storage battery.

What is important in starting an automobile engine is to supply the starter with sufficient electric power necessary to rotate the motor and to apply as high a voltage as possible to the igniter. is there. In the case of the one power supply circuit configuration as described above, both the current flowing through the starter and the current flowing through the igniter at the time of starting are from the same storage battery. It is well known that the minimum current and voltage are required to start the engine. For storage batteries at the end of their life, not only the capacity is decreasing, but also the starting voltage is decreasing. When this voltage becomes about 7 V or less, the engine cannot be started. This is because the voltage applied to the igniter is low because the starting voltage of the storage battery is low, and the engine ignition performance is low.

A storage battery device for an automobile having a dual power source and a three-system configuration has been proposed to solve the above-mentioned problems of the one power source and a three-system configuration. The representative of the two-power-source / three-system configuration currently introduced is equipped with a starting storage battery and a load storage battery, an electromagnetic switch is arranged between both storage batteries, and a diode is located at the positive electrode side of the electromagnetic switch contact. Are connected in parallel as the starting battery side, and the starting battery is a starting device,
The inspection device is connected, and the alternator and the vehicle-mounted full load are connected to the load storage battery. This two-power-three-system configuration has considerably high reliability.

[0009]

However, the two power sources 3
Since implementing a system configuration on a vehicle is expected to cause a significant cost increase, it is only experimentally adopted by some new vehicle manufacturers, and has not yet become popular at present. If the current standard 1 power source 3 system automobile storage battery device can be made into a 2 power source 3 system configuration by slightly improving it, a highly reliable automobile storage battery device can be provided without a significant cost increase. It is great that we can contribute to the modern car society.

In the current standard vehicle having one power source and three system circuits, the connection lines for all in-vehicle loads are concentrated and connected to the plus terminal of the storage battery. Since these connecting lines are integrated by welding, it is difficult to separate each connecting line. In order to have a two-power-three-system configuration, the integrated connecting wire is divided into a starting load, an ignition load and an alternator, and an on-vehicle total load, and the tip of each connecting wire is welded to the terminal. Must. In addition, the terminal also needs to be remodeled into a starting storage battery and a load storage battery. Various tools are required for these remodeling works, and it is very difficult to determine what load line each connection line is, and it is difficult for even a specialist to say.

The present invention has been made to solve the above problems, and its purpose is to improve the reliability of the present one-power-source / three-system automobile storage battery device by only slightly improving it. It is to provide a storage battery device for a two-powered vehicle having the above.

[0012]

Therefore, a main storage battery connected to an on-vehicle full load, a spare storage battery, and an electromagnetic switch circuit connected between the main storage battery and the spare storage battery are provided, and When the voltage is lower than the voltage of the auxiliary storage battery by a certain voltage or more, the main storage battery and the auxiliary storage battery are connected in parallel for a certain time, and the automobile storage battery device is configured so that current flows from the auxiliary storage battery to the main storage battery. By doing so, the above problems are solved.

[0013]

[Operation] 1 power source 3 A storage battery device for automobiles is additionally equipped with a spare battery, and when the voltage of the main storage battery at the time of engine start is lower than the voltage of the spare storage battery by a certain voltage or more between these storage batteries, the main storage battery is Since a current flows from the auxiliary storage battery to the main storage battery only by inserting an electromagnetic switch circuit that connects the storage battery and the auxiliary storage battery in parallel for a certain period of time, high starting performance can be obtained. When connecting the auxiliary storage battery or the electromagnetic switch circuit, it is not necessary to change the existing wiring and it can be easily modified.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. FIG. 1 is a schematic circuit diagram showing one embodiment of the present invention. In the figure, the X part is a schematic diagram of the load wiring of the current standard vehicle. BL is a 12V main storage battery, P1 is a plus terminal of the main battery BL, and the starting device S,
An ignition device IG, an alternator G, and various in-vehicle loads L are connected. Although the wiring system is slightly different depending on the type of vehicle, the starting cable, the starter / switch connection line, and the load connection line are connected to the terminal P1 as a minimum as a unit. These connecting lines are firmly connected to the terminal P1.

In order to modify the circuit of one power source and three systems, it is necessary to separate the starting connection line and the load connection line and newly weld them to the terminal. A current of 300 to 500 A flows into the terminal P1 under a starting load, and a large current of 50 to 100 A flows even under a negative general load. Therefore, if a contact failure occurs at the weld, it may cause an accident. Become. Therefore, a specialized technique is required to connect the terminal and the connecting line. For this reason, even if the storage battery device for a two-power three-system automobile can be provided to a general user, it is dangerous and practically impossible to modify the load wiring of the current standard vehicle.

According to the present invention, in addition to the main storage battery BL, a spare battery B
S is additionally mounted, and when the main storage battery voltage at the time of start-up is lower than the auxiliary storage battery voltage by a certain voltage, an electromagnetic switch circuit Z for connecting both storage batteries in parallel is connected between the two storage batteries. System for automobile battery storage
It is possible to easily provide a more reliable storage battery device for a two-power-source vehicle.

The Y portion of FIG. 1 is a schematic circuit of a portion newly added by the present invention. The electromagnetic switch circuit Z has three terminals, one is P2 for connecting with the main storage battery BL, the other is P4 for connecting with the 12V spare storage battery BS, and the other one is the earth E. is there. In order to facilitate the connection between P2 and P1, for example, the P2 portion may be formed by a thin copper plate terminal and inserted into the gap between the main storage battery pole portion and the terminal P1. In addition, if a terminal P3 for fitting a spare storage battery plus a pole is provided at the P4 portion, and an amplifier terminal is provided at the connection terminal of the ground terminal E, and it is fixed to any vehicle body bolt, two power sources can be easily provided. A storage battery device for an automobile is formed.

Next, the operation of the electromagnetic switch circuit Z of the automobile storage battery device according to the present invention will be described. The electromagnetic switch circuit Z in this embodiment includes an electromagnetic switch MgS connected between the auxiliary storage battery BS and the main storage battery BL, and a diode D1 and a diode connected in parallel to the electromagnetic switch MgS with the positive electrode side being the auxiliary storage battery BS side. It is composed of a resistor R0 connected in series with D1, three transistors Tr1 to Tr3, six resistors R1 to R6, two diodes D2 and D3, and two capacitors C1 and C2.

When the engine is left stopped, the open circuit voltages of the main storage battery BL and the auxiliary storage battery BS do not cause a voltage difference of 1 V or more between both storage batteries even if one of the storage batteries is in a discharged state. The potential of the terminal P1 and the potential of the terminal P3 are almost equal. Therefore, the electromagnetic switch MgS
Since there is a voltage difference between both ends A and B, no current flows from point B → transistor Tr1 → capacitor C1 → diode D2 → point A. Therefore, the transistor Tr1
Is turned off, the transistors Tr2 and Tr3 are also turned off, and the exciting current does not flow in the electromagnetic coil Mg of the electromagnetic switch MgS, so that the contact MgC of the electromagnetic switch MgS is turned off. When the engine is rotating, even if the P1 terminal voltage rises above the P3 terminal voltage, the diode D2 intervenes, so that no current flows into the transistor circuit, the transistors Tr1 to Tr3 are turned off, and the exciting current is applied to the electromagnetic coil Mg. Does not flow, the contact MgC remains in the OFF state.

When the main storage battery BL is discharged and the voltage at the P1 terminal sharply drops at engine start, a transient current flows between point B, transistor Tr1, capacitor C1 and point A. This current stops when the capacitor is charged. During this transient state, the transistor Tr1 is turned on, a voltage is induced across the resistor R4, and the capacitor C2
Is charged, the transistors Tr1 and Tr3 are turned on, an exciting current flows through the electromagnetic coil Mg, the MgC contact is closed, and the main storage battery BL and the auxiliary storage battery BS are connected in parallel. Even if the starting voltage of the main storage battery BL is lowered due to a failure or the like, the backup storage battery BS backs up the voltage at the time of starting and the engine can be easily started. At this time, since the voltage difference between the points A and B suddenly becomes small, the transient current flowing through the capacitor C1 is stopped, and the transistor T
r1 turns off. As a result, the contact MgC is opened before the engine is started. To prevent such a phenomenon,
A capacitor C2 is provided between the base and the ground of the transistor Tr2.
When the transistor Tr1 is turned on, the capacitor C2 is instantly peak-charged by the diode D3, and the capacitor C2 is charged.
10 seconds by the discharge of 2, the transistors Tr2, Tr2
3 can be kept in the ON state. During this period, since the main storage battery BL and the auxiliary storage battery BS are connected in parallel, a starting current flows from both storage batteries, so high engine startability is obtained.

Next, when the voltage of the main storage battery BL is abnormally decreased due to a mistake in turning off the lamp or the like, a maximum voltage difference of 12 V may occur between points A and B, but between points A and B. Since the capacitor C1 is interposed, the transistor Tr1 has a base.
Current does not flow and the transistor Tr1 is never turned on. As a result, the contact MgC maintains the open state, and no current flows from the secondary storage battery BS toward the main storage battery BL, so that the secondary storage battery BS can maintain the fully charged state. Even if the voltage of the main storage battery BL becomes OV due to a lamp extinction mistake, if the lamp switch is returned to the “OFF” state,
The open circuit voltage of the main storage battery BL normally recovers to about 10 to 11V. When the engine is started in this state, the voltage of the main storage battery BL drops and a voltage is generated between points A and B. As described above, the contact MgC is closed for 10 to 20 seconds, the preliminary storage battery BS is connected in parallel, and the main storage battery BS is connected in parallel. The BL battery is charged, and the engine can be started by increasing the voltage at the time of starting. A diode D1 between points A and B is used for charging the backup storage BS battery and also serves to prevent backflow. The resistor R0 is a current limiting resistor, and by inserting this resistor, the diode D
The current capacity of 1 is reduced.

[0022]

As described above, the storage battery device for an automobile according to the present invention includes the main storage battery connected to the on-vehicle full load, the auxiliary storage battery, and the electromagnetic switch circuit connected between the main storage battery and the auxiliary storage battery. When the voltage of the main storage battery at the time of starting is lower than the voltage of the auxiliary storage battery by a certain voltage or more, the main storage battery and the auxiliary storage battery are connected in parallel for a certain time, and a current flows from the auxiliary storage battery to the main storage battery. It is characterized by that. Therefore, when the auxiliary battery is additionally mounted on the one-power-supply-three-vehicle storage battery device and only the electromagnetic switch circuit is connected, when the voltage of the main storage battery at the time of engine start is lower than the voltage of the spare storage battery by a certain voltage or more, Since the main storage battery and the spare storage battery are connected in parallel for a certain period of time and a current flows from the spare storage battery to the main storage battery, high starting performance is obtained. In addition, when connecting the auxiliary storage battery or the electromagnetic switch circuit, it is not necessary to change the existing wiring, and it can be easily modified. The value of the present invention is great.

[Brief description of drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

[Explanation of symbols]

 BL Main storage battery BS Spare storage battery Z Electromagnetic switch circuit

Claims (1)

[Claims] 1. A main storage battery (B connected to an on-vehicle full load)
L), a spare storage battery (BS), an electromagnetic switch circuit (Z) connected between the main storage battery (BL) and the spare storage battery (BS), and the voltage of the main storage battery (BL) at the time of engine start is spare. When the voltage of the storage battery (BS) drops by a certain voltage or more, the main storage battery (BL) and the auxiliary storage battery (BS) are connected in parallel for a certain time, and a current flows from the auxiliary storage battery (BS) to the main storage battery (BL). A storage battery device for an automobile configured to flow.