JPH11334498A - System for preventing battery from overdischarge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a system used for preventing a battery from overdischarge and capable of positively preventing the battery from the overdischarge, and considering a case of a dark current load. SOLUTION: This system for preventing a battery from overdischarge is constituted by being provided with: a battery voltage detecting means 31; a first and a second threshold voltage memory means 34a, 34b, a usage state detecting means 32 for detecting the usage state of a vehicle; an engine stop detecting means 33; a voltage comparing means 35 for reading the threshold voltage memorized on the first or the second threshold voltage memory means in accordance with the usage state of the vehicle upon detecting the engine stop by means of the engine stop detecting means 33 and comparing the threshold voltage with the battery voltage from the battery voltage detecting means 31; and a power-supplying stop means 36 for controlling a power line opening and closing means to stop the supply of the power to entire loads including a dark current load upon determining the presence of the battery voltage which is below the threshold voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for effectively supplying a battery power to a load device (electrical component) provided in a vehicle or the like, and more particularly to a technique in which a vehicle or the like is normally parked during parking. Engine stopped (alternator stopped)
The present invention relates to a battery rising prevention device for preventing a battery rising in a state where a vehicle or the like is stopped for a long time (alternator stopped) during transportation such as overseas export.

[0002]

2. Description of the Related Art In recent years, E as a battery load device has been developed.
A CU (electronic control unit) has been mounted on most of the electrical components, and the power consumption of the battery due to a current called a dark current constantly flowing as a backup is not negligible.

[0003] For this reason, the power consumption of the battery advances unknowingly due to the dark current that is constantly flowing from the time the vehicle is assembled and completed to the time it is disposed of.
The phenomenon of finally running out of the battery and causing the battery to run down is occurring more frequently than ever before.

[0004] Conventionally, when an engine (alternator) mounted on a vehicle or the like is stopped for a long period of time during transportation for overseas export or the like, the engine mounted on the vehicle or the like is turned off. In the state, that is, in a state where the engine is stopped and the ignition key is pulled out of the key cylinder (OFF position), a battery rise that can be caused by a dark current flowing through an ECU mounted on an electric component which is a main load device of the battery is reduced. As a method to prevent it beforehand, for example,
After a certain period of time after the engine is stopped (a state in which the battery is not charged due to the stop of the alternator, etc .; the same applies hereinafter), all ECUs, that is, all load devices (electrical components) in which the ECUs are mounted are automatically connected. A method has been adopted in which the supply of battery power is stopped (cut off) to prevent the battery from rising due to dark current.

Similarly, a state after an engine (alternator) mounted on a vehicle or the like is turned off, that is, a state in which the engine is stopped and an ignition key is inserted into a key cylinder (ACC or OFF position). Alternatively, when the ignition key is pulled out of the key cylinder (OFF position), the battery which may be generated by forgetting to turn off the lamps, which are the main load devices (electrical components) of the battery, or by continuous use of on-vehicle AV equipment (general load). Conventionally, as a method for preventing the battery from rising due to, for example, the supply of battery power to all load devices (electrical components) is automatically stopped (cut off) after a certain time elapses after the engine is stopped, for example. By doing so, it is possible to avoid running out of battery due to general loads (electrical components). Methods have been taken.

FIG. 16 is a block diagram showing an example of such a conventional battery rising prevention device. In FIG. 16, a load (load 2) operable when the ignition key is at the ON position, for example, a relay RLY1 is provided to the vehicle height control device 11 and the fuel pump 14.
Drive power is supplied from the battery 1 (or an alternator not shown) via the.

The load (load 4) operable when the ignition key is in the ACC position, for example, the radio 12 and the air cleaner 15 and the load (load 5) operable when the ignition key is in the OFF position. For example, the clock 13 and the room lamp 16 are supplied with driving power from the battery 1 (or an alternator (not shown)) via the relay RLY3.

Further, a battery 1 (or an alternator (not shown)) is connected to a vehicle height control device 11 having a dark current load, a radio 12, and an ECU load (hereinafter, also referred to as a dark current load) 3 of the timepiece 13 via a relay RLY2. The drive power is always supplied regardless of the key position of the ignition key.

Then, RLY1, RLY2, and RL
Coil1, coil for turning Y3 on or off
The coil 2 and the coil 3 are controlled by a cutoff control circuit 6, which turns on / off a switch SW1 indicating a use state of the vehicle (transportation state for overseas export or normal use state), and On / off control of RLY1, RLY2, and RLY3 is performed based on a key position signal p1 indicating the key position of the ignition key.

Incidentally, the vehicle height control device 1 shown in FIG.
As described above, the power supply (dark current) is always supplied to the ECU load 3 included in the 1, the radio 12, and the clock 13 regardless of the key position of the ignition key. Therefore, for convenience (for simplicity of explanation), as shown in FIG. 17, the ECU loads 3 are combined into one as a dark current load 3, and the radio load is a load that can be operated when the ignition key is in the ACC position. 12 and the air cleaner 15 are combined into one as a load 4 to be used continuously (leaved off) after the engine is stopped,
The clock 13 and the room lamp 16, which are loads that can be operated when the ignition key is in the OFF position, are combined into one load 5 that is easy to forget after turning off the engine, and the vehicle is a load that can be operated when the ignition key is in the ON position. High control device 11 and fuel pump 1
4 will be described collectively as one other load 2.

Hereinafter, the dark current load 3 is called a dark current load,
The other loads 4 that can be used continuously after the engine is stopped (leaving it off) and the loads 5 that are easy to forget after turning off the engine are called general loads, and the load 2 that can operate when the engine is running is called other loads. (All are the same in the following description). FIG. 17 is a simplified view of FIG.

In the above configuration (the configuration of FIG. 17), the operation of the conventional battery running-out prevention device will be described with reference to the flowchart of FIG. still,
FIG. 18 is a flowchart showing an example of the operation of the conventional battery dead prevention device.

When the engine mounted on the vehicle or the like is stopped, that is, when the ignition key is in the ACC position or the OFF position with the ignition key inserted into the key cylinder, the shut-off control circuit 6 sets the RL.
Y1 is turned off to stop supplying power to the other loads (loads operable when the ignition key is in the ON position) 2 (steps S1 and S2), and the cutoff control circuit 6
The two predetermined timer times (timer 1 and timer 2) are set in a timer device (not shown) provided in the inside of the device, and each timer is started (step S).
3). Note that timer 1 <timer 2.

The cutoff control circuit 6 waits until the timer 1 times out (timer time elapses). When the timer 1 times out, the RLY 3 is turned off to control the load (the load to be used continuously after the engine stops). 4) and power supply to the load 5 (the load that is easy to forget to turn off after the engine is stopped) 5 is stopped (steps S4 and S5). Further, the cutoff control circuit 6 further waits until the timer 2 times out (timer time elapses). When the timer 2 times out, the cutoff control circuit 6 controls the RLY 2 to be turned off to supply power to the load (dark current load) 3. It stops (steps S6, S7).

Thus, when a predetermined time elapses after the engine is stopped, the supply of the battery power to a general load device (an electrical component which is a load other than the dark current load) first provided to the vehicle or the like is started by the timer 1. After the time set in
All of them are automatically stopped (cut off), and then, after the time set in the timer 2 has elapsed, the supply of the battery power to the dark current load is automatically stopped (cut off).

With the above control, it is possible to prevent the lamps, which are battery load devices (general load devices) from being turned off after the engine stops, and prevent the battery from running down due to continuous use of a radio (vehicle AV equipment) or the like. The battery is prevented from rising due to dark current flowing through the ECU load, which is a current load.

By the way, in the above-mentioned conventional battery rising prevention device, for example, after the engine is stopped, when a plurality of electrical components are in an operating state (a state in which battery power is supplied), or even when a single unit is used, the power consumption is large. When the electrical components are activated, the battery capacity is consumed unexpectedly (as a result, the preset timer time becomes inappropriate), and the battery runs out (fault). May occur.

Further, even if the electrical components of an appropriate number or power consumption (when a preset timer time is appropriate) are in an operating state after the engine is stopped, for example, the air conditioner or the AV equipment is not operated at night. In a case such as after running for a long time in the rain while running, and when the battery capacity at the time of stopping the engine has decreased with respect to the fully charged state, unexpectedly, (As a result, the preset timer time becomes inappropriate) The battery capacity is consumed before the timer time elapses, and the battery may run out (fault).

[0019]

As described above, according to the conventional battery rising prevention device, the remaining capacity of the battery after the engine is stopped, the general load and the dark current load used (operated) after the engine is stopped, etc. Since the battery power is not supplied and stopped (cut off) to the electrical components in consideration of the total load capacity (total power consumption) of the load devices (electric components), the remaining capacity of the battery is considered as a result. Since the battery power is supplied and stopped (cut off) to the electrical components without any delay, the battery may run out before the set timer time depending on the remaining capacity of the battery immediately after the engine is stopped. There were problems (disadvantages).

The present invention has been made in view of the above problems, and has been made in consideration of the case where the remaining capacity of the battery after stopping the engine becomes an unexpected value, or a load device (electrical component) used after stopping the engine. ) Is to provide a dead battery prevention device that can reliably prevent the dead battery from occurring even when the total load capacity (total power consumption) of the battery becomes an unexpected value. It is assumed that.

[0021]

In order to achieve the above-mentioned object, a battery rising prevention device according to the first aspect of the present invention is provided by the first embodiment of the battery rising prevention device of the present invention shown in FIG. As is clear from the block diagram showing the basic configuration in the embodiment, a vehicle that supplies the battery power to various loads 3, 4, and 5 operated by the battery power supply 1 after the engine is stopped via the power supply line opening / closing means RLY4. A battery voltage detection device 31 for detecting a battery voltage; a first threshold voltage storage device 34a for storing a voltage value corresponding to a first remaining battery capacity; A second threshold hole for storing a voltage value corresponding to a remaining battery capacity smaller than the first remaining battery capacity A voltage storing means 34b, and use state detecting means 32 for detecting a use state of the vehicle, the engine stop detecting means 33 for detecting that the engine is stopped
When the engine stop is detected by the engine stop detecting means 33, the first or second state is determined according to the use state of the vehicle detected by the use state detecting means 32.
Threshold voltage storage means 34a or 34b
A voltage comparing means for reading out the threshold voltage and comparing the threshold voltage with the battery voltage detected by the battery voltage detecting means 31; If it is determined to be below, the power supply line opening / closing means RLY4 is controlled, and the power supply stopping means 36 for stopping the supply of power to all of the various loads 3, 4, 5 is provided. It is characterized by the following.

According to the first aspect of the present invention, in order to prevent the battery from running out, after the engine is stopped, the battery voltage is reduced to a predetermined second threshold voltage (V).
th2) The supply of battery power to a load device (electrical component) provided in the vehicle or the like is automatically stopped (cut off) under the control of the cut-off control circuit 21 when the value becomes th2) or less. For example, when the battery voltage becomes equal to or lower than a predetermined first threshold voltage (Vth1) after the engine is stopped in a state where the vehicle is in a transportation system at the time of overseas export or the like, a dark current load device provided in a vehicle or the like is provided. The supply of the battery power to the power supply is automatically stopped (including the stop of the power supply to the general load device) under the control of the cutoff control circuit 21.

According to a second aspect of the present invention, there is provided a battery rising prevention device according to the first aspect, wherein the power supply stopping means includes a power source for all of the various loads. Immediately before stopping the supply, means for notifying the user of the power supply stop, and means for interrupting the power supply stop,
It is characterized by having.

According to a second aspect of the present invention, after the engine is stopped, the battery voltage becomes equal to or lower than the second threshold voltage (Vth2), and the battery power is supplied to a load device (electrical component) provided in a vehicle or the like. Immediately before the supply is stopped (cut off) by the control of the cutoff control circuit 21,
This is notified to the user using sound, light, or the like, and furthermore, it is possible to interrupt the forced power supply stop.

According to a third aspect of the present invention, there is provided a battery rising prevention device according to the first or second aspect of the present invention, wherein the use state detecting means includes a current state of the vehicle. The use state is detected by the on / off state of the switch SW1 indicated by the on / off state.

According to a third aspect of the present invention, an operator or a user checks the current use state of the vehicle by using the switch SW1.
This makes it possible for the battery rising prevention device to recognize it. Further, the battery rising prevention device according to claim 4 made according to the present invention is characterized by claim 2.
Wherein when the switch SW1 is on, it indicates that the vehicle use state is in a long-term transport state, and when the switch SW1 is off, the vehicle use state is in a normal use state by a user. Respectively, and the voltage comparison means operates the switch SW1
Is in the ON state, the threshold voltage is read from the first threshold voltage storage means 34a, the threshold voltage is compared with the battery voltage detected by the battery voltage detection means 31, and the switch SW1 is turned on. In the off state, a threshold voltage is read from the second threshold voltage storage means 34b, and the threshold voltage is compared with the battery voltage detected by the battery voltage detection means 31. It is.

According to the fourth aspect of the present invention, when the vehicle is in a long-term transportation state, at least the remaining battery capacity corresponding to the threshold voltage stored in the first threshold voltage storage means 34a is reduced. When the vehicle is in a normal use state by the user, at least a remaining battery capacity corresponding to the threshold voltage stored in the second threshold voltage storage means 34b is ensured. State), it is possible to reliably prevent the battery from being exhausted and to use the batteries effectively.

According to a fifth aspect of the present invention, there is provided a battery rising prevention device according to the fourth aspect, wherein the various loads 3, 3 are provided.
Reference numerals 4 and 5 denote dark current loads 3 to which power is supplied regardless of whether the engine is stopped or running, and general loads 4 and 5 to which power is supplied at least when the engine is stopped. It is characterized by comprising.

According to the fifth aspect of the present invention, not only is the general load 4, 5 generated when the engine is stopped when the battery is used, but also the dark current load 3 when the engine is stopped uses the battery. In this case, any battery running out of battery that can be caused by the above operation is prevented.

According to a sixth aspect of the present invention, there is provided a battery rise prevention device according to any one of the first to fifth aspects, wherein the engine stop detection means 33 is provided with a key position of an ignition switch. And detecting the stopped state of the engine.

According to a sixth aspect of the present invention, the stopped state of the engine is detected from a key position of an ignition switch. Further, the battery rising prevention device according to claim 7 made by the present invention is, as apparent from the block diagram showing the basic configuration of the second embodiment of the battery rising prevention device of the present invention in FIG. After the engine is stopped, the battery power is supplied to the plurality of dark current loads 3 through the first power line switching means RLY2, and the battery is supplied to the plurality of general loads 4 and 5 through the second power line switching means RLY3. A battery rising prevention device mounted on a vehicle for supplying power, wherein a battery voltage detecting means 31 detects a battery voltage.
A threshold voltage storage means 43 for storing first and second threshold voltages corresponding to different first and second remaining battery capacities; and a use state detection means 32 for detecting a use state of the vehicle. A key position detecting means 37 for detecting a key position of an ignition switch, and detecting that the engine has been stopped from the key position;
7, when the stop of the engine is detected by the use state detector 7 and the state in which the engine of the vehicle is not started for a long time is detected by the use state detection means 32, the first threshold voltage is stored in the threshold voltage storage means 43. And a voltage comparison means 35 for comparing the first threshold voltage with the battery voltage detected by the battery voltage detection means 31. The voltage comparison means 35 sets the battery voltage to the first threshold. A power supply stopping means for controlling the first power line opening / closing means RLY2 and stopping the supply of power to the plurality of dark current loads 3 when it is determined that the voltage is equal to or lower than the hold voltage; It is characterized by being performed.

The invention according to claim 7 is characterized in that, when the vehicle is detected by the use state detecting means 32 as being in a state of transportation for overseas export (a state in which the engine is not started for a long time) after the engine is stopped, the battery is used. The voltage is compared with the first threshold voltage (Vth1) stored in the threshold voltage storage means 43, and the dark current load 3
When the battery voltage falls below the first threshold voltage due to the consumption of the battery capacity by
The power supply to the load 3, the load 4, and the load 5 is stopped.

According to the eighth aspect of the present invention, there is provided a battery rising prevention device according to the present invention, for operating or stopping each of the plurality of general loads 4 and 5. Of the plurality of on / off switches s1, s2, s3, s4,... Provided for each of the plurality of general loads 4, 5 and the on state of the plurality of switches s1, s2, s3, s4,. An operating load device detecting means 38 for detecting and detecting a load during operation; a load current storing means 40 for storing a rated current flowing through each of the plurality of general loads 4 and 5; The read rated current flowing through the load during each operation is read out from the load current storage means 40, and the key position detected by the key position detection means 37 is determined. Total load current value calculating means 39 for calculating the sum of the currents flowing through the loads by adding only the rated currents flowing through the loads to be in the operating state, and flowing through the loads determined by the total load current value calculating means 39. An end-of-discharge voltage detecting means for obtaining an end-of-discharge voltage from a sum of currents; and a threshold value generating means for generating a threshold value by adding a predetermined value to the end-of-discharge voltage; If the detecting means 37 detects the stop of the engine and the use state detecting means 32 detects that the engine of the vehicle is not in a state where the engine is not started for a long period of time, the threshold value and the battery voltage value are set to the voltage. The voltage is compared by the comparing means 35. When the voltage comparing means 35 detects that the battery voltage value has become equal to or less than the threshold value, Supply stopping means 3
6, the second power line opening / closing means RLY3 is controlled,
Power supply to all of the general loads 4 and 5 is stopped.

According to the invention described in claim 8, after the engine is stopped, the use state detecting means 32 causes the vehicle to be in a normal user use state (regularly or irregularly, but the engine is not started for a long time). Non-state)
Is detected, the remaining capacity of the battery 1 becomes
When consumed by a general load other than the dark current load, for example, when the capacity is reduced to the minimum necessary for starting the engine,
Under the control of the cutoff control circuit 22, the supply of battery power to general load devices (electric components) other than the dark current load provided in the vehicle or the like is automatically stopped (cut off).

According to a ninth aspect of the present invention, there is provided a battery rising prevention device according to the present invention, wherein the power supply stopping means 36 is provided for all of the general loads. Immediately before stopping the supply of power, a means for notifying a user that the supply of power is to be stopped and a means for interrupting the stop of the supply of power are provided. .

According to the ninth aspect of the present invention, after the engine is stopped, immediately before the power supply stopping means 36 stops the power supply to all of the general loads, a sound or light is used to indicate the fact. In this case, the user is notified of the power supply, and the user can forcibly stop the power supply.

The battery rising prevention device according to claim 10 made according to the present invention is characterized by claim 8 or 9.
In the battery rising prevention device according to the above, the stop of the engine is detected by the key position detecting means 37, the use state detecting means 32 detects that the engine of the vehicle is not in a state in which the engine is not started for a long time, and the operation When the load device detecting means 38 detects that all the general loads 4 and 5 are not operating, the threshold voltage storing means 43 stores the second
Is read out, and the second threshold voltage and the battery voltage detecting means 31 are read out.
Is compared with the battery voltage detected by the voltage comparing means 35. When the voltage comparing means 35 determines that the battery voltage is equal to or lower than the second threshold voltage, the power supply stopping means 36, the first power supply line opening / closing means RLY2 is controlled, and the supply of power to the plurality of dark current loads 3 is stopped.

According to the tenth aspect of the present invention, when the battery voltage becomes equal to or less than a second threshold voltage (Vth2) set after the engine is stopped, a load device (particularly, a dark device) provided in a vehicle or the like is provided. The supply of battery power to the current load device is automatically stopped (cut off) under the control of the cutoff control circuit 22. In the battery running-out prevention device according to claim 11 made according to the present invention, in the battery running-out prevention device according to claims 7 to 10, the use state detecting means 32 detects the current use state of the vehicle. , Its on /
Detected by the on / off state of the switch SW1 that is notified by the off state. When the switch SW1 is on, the use state of the vehicle is in a long-term transport state, and the engine of the vehicle is in a long-term state. The off-state indicates that the vehicle is in a normal use state by the user and the engine of the vehicle is not in a state in which the engine is not started for a long time. It is assumed that.

According to the eleventh aspect of the present invention, the current use state of the vehicle is determined based on the on / off state of the switch SW1, so that the fuse which has been conventionally used at the time of loading and transporting a vehicle or the like is used. Compared with the removal, the complexity of the operation can be reduced, and the time and labor for managing the fuse after the removal can be greatly reduced.

The battery rising prevention device according to the twelfth aspect of the present invention is provided by the seventh to eleventh aspects.
4. The battery rising prevention device according to claim 1, wherein
Threshold voltage secures the battery capacity required for various operations performed before starting the engine and the battery capacity required for starting the engine when the state in which the engine of the vehicle is not started for a long time is released. It is set to a voltage value, and the second threshold voltage is set to a voltage value that secures at least a battery capacity necessary for starting the engine.

According to the twelfth aspect of the present invention, the first threshold voltage is required for various operations performed before starting the engine when the state in which the engine of the vehicle is not started for a long time is released. The battery capacity is set to a voltage value that secures the battery capacity necessary for starting the engine, and the second threshold voltage is set to at least a voltage value corresponding to the battery capacity necessary for starting the engine.

Further, the battery rising prevention device according to the thirteenth aspect of the present invention is provided by the seventh to twelfth aspects.
Wherein the key position detecting means 37 detects that the engine is running when the ignition switch is in the ON position, and detects whether the ignition switch is in the OFF or ACC position. It is detected that the engine is stopped.

According to the thirteenth aspect of the present invention, the stopped state of the engine is detected from the key position (ACC or OFF position) of the ignition switch. Claim 1 made by the present invention
The battery discharge prevention device according to claim 4 is the battery discharge prevention device according to any one of claims 7 to 13, wherein the discharge end voltage detecting means 41 determines the open end voltage of the battery as V _OPEN , which depends on the standard capacity of the battery. When the constant is a and the total amount of the load current values is I, the discharge end voltage V _END is obtained by the following equation: V _END = −a · I + V _OPEN (Equation 1) It is a feature.

According to the fourteenth aspect of the present invention, since the discharge end voltage V _END can be calculated by performing a simple calculation, the characteristic of the battery that the voltage value sharply decreases with time is reflected. Discharge end voltage V _END
Can be easily and accurately calculated.

Further, the battery rising prevention device according to claim 15 made according to the present invention is characterized by claim 8 to claim 14.
Wherein the threshold value generated by the threshold value generating means 42 is a voltage value corresponding to the minimum amount of energy to be supplied to the starter motor required to start the engine. , Is set to a value added to the discharge end voltage.

According to a fifteenth aspect of the present invention, as the threshold value, a voltage value corresponding to the minimum amount of energy to be supplied to the starter motor for starting the engine is added to the discharge end voltage. It is set to the specified value. The battery rising prevention device according to claim 16 made by the present invention is, as is apparent from the block diagram showing the basic configuration of the third embodiment of the battery rising prevention device of the present invention in FIG. After stopping the engine,
The first fuse FUSE1 for the first dark current load 3a
The battery power is supplied through the first power line switching means (switch means) 46, and the second fuse FUSE2 and the second power line switching means (switch means) 47 are supplied to the second dark current load 3b. A battery power supply for supplying a battery power to the plurality of general loads 4 and 5 via a third power line opening / closing means RLY3. Battery voltage detecting means 31 for detecting;
First threshold voltage storage means 45a for storing a threshold voltage corresponding to the first remaining battery capacity, and second threshold voltage storage means 45b for storing a threshold voltage corresponding to the second remaining battery capacity. A third threshold voltage storage unit 45c for storing a threshold voltage corresponding to a third remaining battery capacity; a use state detection unit 32 for detecting a use state of the vehicle; and detecting that the engine has stopped. When the engine stop is detected by the engine stop detecting means 44 and the engine stop detecting means 44 and the state in which the engine of the vehicle is not started for a long time is detected by the use state detecting means 32, 3 by controlling the power supply line opening / closing means RLY3. The threshold voltage is read out from the power supply stop means 36 for stopping the supply of power to all the power supply and the second threshold voltage storage means 45b, and the threshold voltage is detected by the battery voltage detection means 31. When the battery voltage is determined to be equal to or lower than the threshold voltage, the first power line opening / closing means 46 is controlled via the power supply stopping means 36 to control the first And a voltage comparing means 35 for stopping the supply of power to the dark current load 3a.

The invention according to claim 16 is characterized in that when the stop of the engine is detected and the state in which the engine of the vehicle is not started for a long period is detected (the fuse is removed), When the supply of power to all the general loads is stopped, the battery capacity is consumed by the first dark current load 3a and the battery voltage falls below the second threshold voltage. The power supply to the dark current load 3a is stopped.

According to a seventeenth aspect of the present invention, there is provided a battery rising prevention device according to the sixteenth aspect, wherein the voltage comparing means includes an engine stop detecting means 44 for detecting an engine stop. When the stop is detected and the use state detection means 32 detects that the state in which the engine of the vehicle is not started for a long time is not detected, the first threshold voltage storage means 45a The threshold voltage is read out more, the threshold voltage is compared with the battery voltage detected by the battery voltage detecting means 31, and when it is determined that the battery voltage is equal to or lower than the threshold voltage,
The third power line switching means RLY3 is controlled via the power supply stopping means 36 to stop supplying power to the plurality of general loads 4 and 5, and further, the third threshold voltage storage means The threshold voltage is read from 45c, and the threshold voltage is compared with the battery voltage detected by the battery voltage detecting means 31, and when it is determined that the battery voltage has dropped to the threshold voltage or less, The power supply to the second dark current load 3b is stopped by controlling the second power supply line opening / closing means 47 via the power supply stop means 36.

According to the seventeenth aspect of the present invention, the stop of the engine is detected, and the vehicle is in a state of normal user use (regular or irregular, but not in a state where the engine is not started for a long time) If the battery voltage drops below the first threshold voltage, the supply of power to the plurality of general loads is stopped,
Further, when the battery voltage falls below the third threshold voltage, the supply of power to the second dark current load 3b is stopped.

In the battery running-out prevention device according to the present invention, the power supply stopping means may be replaced with the third power line opening / closing means. Immediately before stopping the supply of power to the plurality of general loads 4 and 5 by controlling the RLY 3, means for notifying a user that the supply of power is stopped, and stopping the supply of power. Interrupting means.

The invention according to claim 18 is characterized in that after the engine is stopped, the power supply stopping means 36 uses sound, light or the like immediately before stopping the supply of power to all the general loads. In this case, the user is notified of the power supply, and the user can forcibly stop the power supply.

Further, the battery rising prevention device according to the nineteenth aspect of the present invention is provided by the present invention.
8, the first dark current load 3a is a dark current load to which battery power is to be supplied as much as possible, even if the engine of the vehicle is not started for a long time. The second dark current load 3b may be a dark current load that may stop supplying battery power when the engine of the vehicle is not started for a long time. Things.

According to the nineteenth aspect of the present invention, the dark current load 3a to which the battery power is to be supplied as much as possible and the dark current load to the vehicle even when the vehicle engine is not started for a long period of time. When the engine is not started for a long time, the supply of the battery power is divided into the dark current load 3b, which may be stopped, and the remaining battery capacity is preferentially supplied to the dark current load 3a. It was made.

Further, the battery rising prevention device according to claim 20 made according to the present invention is characterized by claim 16 to claim 1.
9, the first and second power supply line opening / closing means 46 and 47 are constituted by semiconductor switching elements, and the third power supply line opening / closing means RLY3 is constituted by a relay. It is characterized by having.

According to the twentieth aspect of the present invention, a load through which a relatively large current flows is supplied with power through a relay, and a dark current load through which only a small current flows flows through a semiconductor switching element. The power is supplied by the power supply. Claim 2 made by the present invention
The battery rising prevention device according to claim 1, wherein the first threshold voltage is higher than the second threshold voltage, and the second threshold voltage is higher than the second threshold voltage. Higher than the third threshold voltage,
Further, the third threshold voltage is set to a voltage value corresponding to at least a minimum amount of energy to be supplied to the starter motor required to start the engine.

According to the twenty-first aspect of the present invention, a plurality of threshold voltages having different voltage differences (set values) are provided, and power is supplied to an important load to the end. Claim 2 made by the present invention
20. The battery rising prevention device according to claim 2, wherein the use state detecting means 32 includes the second fuse FUS.
Detecting that the engine is not to be started for a long time in a state where E2 is inserted, and detecting that the engine is not to be started for a long time when the second fuse FUSE2 is removed. It is characterized by the following.

The invention according to claim 22 has the advantage that the use state detecting means 32 does not need to add a new component (switch SW1 or the like) for detecting the state of the vehicle.

[0058]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a block diagram showing a first embodiment of the battery exhaustion prevention device according to the present invention.

In FIG. 4, the ignition key is turned on.
A drive power is supplied from a battery 1 (or an alternator (not shown)) via a relay RLY1 to a load 2, which is operable when in the position, for example, a vehicle height control device or a fuel pump.

Further, a load 4 constituted by, for example, a radio or an air cleaner, which can be operated when the ignition key is in the ACC position, or a clock, a room lamp, etc., which can be operated when the ignition key is in the OFF position, are provided. EC of the vehicle height control device, the radio, and the clock having the load 5 configured and the dark current load
The driving power is supplied to the dark current load 3 as the U load from the battery 1 (or an alternator (not shown)) via the relay RLY4.

Coil 1 and coil 4 for turning RLY 1 and RLY 4 on or off.
Is controlled by a cut-off control circuit 21. The cut-off control circuit 21 turns on / off a switch SW1 indicating a use state of the vehicle (transportation state for overseas export or normal use state), and an ignition key (key). SW) is configured to perform on / off control of RLY1 and RLY4 based on a key position signal p1 indicating the key position of SW).

Further, the cutoff control circuit 21
When the on / off control of the RLY1 and the RLY4 is performed based on the detected voltage value and the off control of the RLY1 and the RLY4 is performed, a warning sound or light by a buzzer or the like is used. By using another method, the user is notified that the supply of the battery power to RLY1 and RLY4 is stopped.

In the above configuration, the number and types of load devices mounted (mounted) by the vehicle naturally increase or decrease (change). Next, the operation of the battery exhaustion prevention device of the present invention will be described with reference to the flowchart of FIG. still,
FIG. 5 is a flowchart showing an example of the operation of the first embodiment of the battery dead prevention device of the present invention.

The shutoff control circuit 21 stops the engine mounted on the vehicle or the like, that is, the engine stop detecting means 33 inserts the ignition key into the key cylinder and the ignition key is in the OFF or ACC position (alternator). When it is detected that the battery is no longer charged by the power supply, the power supply stopping means 36 controls the RLY1 to be turned off, and the supply of power to the load 2 is stopped (steps T1 and T2).

Then, the use state of the vehicle is detected by the use state detecting means 32 from the ON / OFF state of SW1.
When W1 is on, that is, when it is detected that the vehicle is in a state of transportation for overseas export, the first threshold voltage (Vt) as shown in FIG.
The threshold voltage is read from the first threshold voltage storage means 34a storing h1) (steps T3 and T5). On the other hand, when SW1 is off, that is, when it is detected that the vehicle is in a state of normal user use, the second threshold voltage (Vth2) as shown in FIG. Is read out from the second threshold voltage storage means 34b for storing the threshold voltage (step T).
3, T4).

FIG. 6 is a graph showing the discharge characteristics of the battery 1. Also, as is apparent from FIG.
Is set higher than the second threshold voltage (Vth2). This is because the first threshold voltage (Vth
This is because 1) is set to a voltage value corresponding to the battery capacity required after the arrival of overseas export transportation. On the other hand, the second threshold voltage (V
th2) may be set to a minimum required battery capacity during normal user use, for example, a voltage value corresponding to a capacity at least capable of starting the engine, and therefore the first threshold voltage (Vth1) ) Is set lower.

Subsequently, the latest battery voltage is read from the battery voltage detecting means 31, and the threshold voltage obtained in step T 4 or T 5 is read by the voltage comparing means 35 with the latest battery voltage obtained by the battery voltage detecting means 31. (Steps T6 and T6)
7) If it is determined that the latest battery voltage is higher than the threshold voltage, after waiting for a predetermined time,
The latest battery voltage is read from the battery voltage detecting means 31 again and compared with the threshold voltage obtained in step T4 or T5 (steps T8 and T5).
6, T7).

If it is determined in step T7 that the latest battery voltage is equal to or lower than the threshold voltage, the power supply stopping means 36 controls the RLY 4 to be turned off, and the power supply to the loads 3, 4, and 5 is turned off. The supply is stopped (step T9). Also, at this time, that is, immediately before stopping the supply of power to the load 3, the load 4, and the load 5, for example, by using a warning sound or light by a buzzer or the like,
Notify the user that the power supply has stopped.

At this time, if the user does not want to stop the power supply, the user inserts the key into the key cylinder, for example, or removes the key once when the key is already inserted into the key cylinder. The power supply may not be forcibly stopped by reinserting the power supply.

From the above, when the battery voltage becomes equal to or lower than a preset threshold voltage (Vth2 in this case) after the engine is stopped, supply of battery power to a load device (electrical component) provided in a vehicle or the like is performed. All are automatically stopped (cut off) by the control of the cutoff control circuit 21,
Continuous use of a battery load device (electrical components, etc. operable after the engine is stopped) after the engine is stopped, for example, forgetting to turn off lamps or a radio (vehicle AV device) as another load device (electrical component). The battery can be prevented from rising due to this. at least,
At a minimum, the remaining battery capacity for starting the engine (operating the alternator) is ensured, so that the engine can be restarted.

When the SW1 is on, that is, when the vehicle or the like is in a transportation system, for example, when exporting overseas, after the engine is stopped, the battery voltage becomes lower than a preset threshold voltage (Vth1 in this case). Then, the supply of the battery power to the dark current load device provided in the vehicle or the like is automatically stopped (including the stop of the power supply to the general load device) under the control of the cutoff control circuit 21. Thereby, when the state of the transportation system at the time of overseas export of the vehicle or the like is released, various problems that may occur due to insufficient battery remaining capacity can be prevented.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a block diagram showing a second embodiment of the battery dead prevention device according to the present invention. In FIG. 7, the ignition key is ON
A drive power is supplied from a battery 1 (or an alternator (not shown)) via a relay RLY1 to a load 2, which is operable when in the position, for example, a vehicle height control device or a fuel pump.

Further, it can be operated when the ignition key (key SW) is in the ACC position, and can be operated when the ignition key is in the OFF position, for example, a load 4 constituted by a radio or an air cleaner (air purifier) or the like. A load 5 composed of, for example, a clock or a room lamp is supplied with driving power from the battery 1 (or an alternator (not shown)) via a relay RLY3.

Further, a dark current load 3 (as described above, which is an ECU load for the vehicle height control device, the radio, and the watch)
For simplicity of description, the loads are treated as loads different from the loads 2, 4, and 5. The conventional technology) includes a relay RL
Drive power is supplied from the battery 1 (or an alternator not shown) via Y2.

Then, RLY1, RLY2, and RL
Coil1, coil for turning on or off Y3
L2 and coil3 are controlled by a cutoff control circuit 22. The cutoff control circuit 22 is used in a state of use of the vehicle, that is, a state of transportation for overseas export (a state in which the engine is not started for a long period of time) or a normal user use. (A state in which the engine is not started for a long period of time, although regularly or irregularly), and a key position signal p1 indicating a key position of an ignition key (key SW). On the basis of,
It is configured to perform on / off control of RLY1, RLY2, and RLY3.

Further, the cutoff control circuit 22 constantly detects the voltage of the battery 1, and based on the detected voltage value, turns on / off the RLY1, RLY2 and RLY3.
When the off control is performed and at least the RLY 3 off control is performed, the load 4 and the load 5 to which the battery power is supplied to the user via the RLY 3 are provided to the user using, for example, a warning sound or light by a buzzer or the like. Is notified that the supply of battery power to the battery is stopped.

Further, the switches S1, S2, S3, S4 for turning on / off each load device (in FIG. 7, interior light, tail light, audio, TV) are, for example, turned on / off.
The OFF information is supplied to the cutoff control circuit 22 as a switch signal. In the above configuration, it goes without saying that the number and types of load devices mounted (mounted) by the vehicle increase or decrease (change).

Next, the operation of the battery running-out prevention device in the battery running-out prevention apparatus of the present invention will be described with reference to the flowchart of FIG. FIG.
9 is a flowchart illustrating an example of an operation of the battery dead prevention device according to the second embodiment of the present invention.

The shutoff control circuit 22 stops the engine mounted on the vehicle or the like, that is, the state where the ignition key is inserted into the key cylinder by the key position detecting means 37 and the ignition key is OFF or in the ACC position ( When it is detected that the battery charge by the alternator is no longer performed) or that the ignition key is removed from the key cylinder, the power supply stopping means 36 controls the RLY1 to be turned off, and the power supply to the load 2 is stopped. The supply of water (step U
1, U2).

Next, the operating state detecting means 32
The use state of the vehicle is detected from the on / off state of the vehicle.
When the switch SW1 is ON, that is, when the use state detection means 32 detects that the vehicle is in a state of transportation for overseas export (a state in which the engine is not started for a long time), the threshold voltage storage means 43 is provided by a predetermined method. The first threshold voltage (Vth1) as shown in FIG. 9 is read out from the threshold voltage storage means 43 (steps U3 and U4). FIG. 9 is a graph showing the discharge characteristics of the battery 1. Also, as is clear from FIG. 9, the first threshold voltage (V
This is because, for example, the voltage value corresponding to the required battery capacity is set after the arrival of overseas export transportation (after the engine has not been started for a long time).

Thereafter, the cutoff control circuit 22 reads the latest battery voltage from the battery voltage detecting means 31 (step U5), and the voltage comparing means 35
The first threshold voltage obtained in step 4 is compared with the latest battery voltage obtained from the battery voltage detecting means 31 (step UT6), and the latest battery voltage is higher than the first threshold voltage. Is determined, after waiting for a predetermined time (step U
7) The latest battery voltage is read from the battery voltage detecting means 31 again (step U5), and step U4 is performed.
Is compared with the first threshold voltage obtained at step (step U6).

When it is determined in step U6 that the latest battery voltage is equal to or lower than the first threshold voltage, the power supply stopping means 36 controls the RLY2 and RLY3 to be turned off, respectively, and the loads 3 and 4 are turned off. , And the supply of power to the load 5 is stopped (step U
8).

On the other hand, in step U3, it is determined that SW1 is turned off, that is, the use state detecting means 32 determines that the vehicle is in a normal user use state (regularly or irregularly, but the engine is not started for a long time). If it is determined that the load device is not in the state, the load devices (FIG. 7)
In this embodiment, the interior light, the tail light, the audio,
V) switches S1, S2 for turning on / off
It is detected whether S3 and S4 are off (step U9).

At step U9, switches S1, S2,
When it is determined that any one of S3 and S4 is in the ON state, the operation load device detecting means 38 constituting the cutoff control circuit 22 changes the state (switch signal) of the switches S1, S2, S3 and S4. The load device (electric component) currently energized (operating) is detected based on the detected
The load current storage means 40 stores the rated current flowing through each load during operation detected by step 8 and adds them (step U10).

Then, the current key position (ACC or OFF) is detected by the key position detecting means 37 (step U11). If it is detected that the key position is the OFF position, the operation state is determined at the time of the key position. The rated current flowing through the load
Subtraction is performed from the value obtained in step U10 (step U10).
12, U13), and proceed to step U14. On the other hand, when it is detected that the key position is the ACC position, the subtraction process in step U13 is not performed and the process proceeds to step U14.
Proceed to.

Next, based on the sum of the currents flowing through the load (loads other than the dark current load that is actually in operation), obtained by the total load current value calculating means 39 as described above, the discharge termination voltage detection is performed. The discharge end voltage is obtained by means 41 (step U14), and a predetermined value α is added to the discharge end voltage obtained in step U14. Is generated (step U).
15). As the value of α, for example, a voltage value corresponding to the energy (battery capacity) to be supplied to the cell motor, which is the minimum necessary to start the engine by turning the cell motor, is set.

Subsequently, the cutoff control circuit 22 reads the battery voltage of the battery 1 detected by the battery voltage detecting means 31 (step U16), and determines the threshold value obtained by the threshold value generating means 42 and the battery voltage. The comparison with the latest battery voltage value of the battery 1 read from the detecting means 31 is performed by the voltage comparing means 35 (step U17).

As a result of the comparison in step U17, when it is determined that the battery voltage is higher than the threshold value, that is, the amount of energy (battery capacity) consumed by each of the load devices operating after the engine is stopped. When it is determined that the value (remaining battery capacity) subtracted from the battery capacity of the battery 1 has sufficient capacity to start the engine, for example, the shutoff control circuit 22
Continuously supplies power to each load device, waits for a predetermined time to elapse (step U18), and reads the battery voltage of the battery 1 detected by the battery voltage detection circuit 31 again. (Step U1
6) The voltage comparator 35 compares the threshold value obtained by the threshold generator 42 with the latest battery voltage read from the battery voltage detector 31 (step U17).

As a result of the comparison in step U17, when the voltage comparison means 35 determines that the battery voltage is equal to or lower than a threshold value obtained by adding a predetermined value α to the discharge end voltage value, that is, the operation is started after the engine is stopped. A value obtained by subtracting the amount of energy (battery capacity) consumed by each load device (other than the dark current load) from the battery capacity of the battery 5 (battery remaining capacity) is, for example, the minimum required capacity for starting the engine. If it is determined that only the remaining power remains, the power supply stopping means 36 constituting the cutoff control circuit 22 controls the RLY2 and RLY3 to be turned off,
Control is performed to stop energization (power supply) to all the load devices (load 3, load 4, and load 5) under the management (step U8). At this time, that is, load 3, load 4, and load 5 (at least load 4, and load 5)
Immediately before the supply of power to the power supply is stopped, the user is notified of the stop of the supply of power by using a warning sound, light, or other method such as a buzzer.

At this time, if the user does not want to stop the power supply, the user inserts the key into the key cylinder, for example, or removes the key once when the key is already inserted into the key cylinder. The power supply may not be forcibly stopped by reinserting the power supply.

As described above, after the engine is stopped, when the remaining capacity of the battery 1 is consumed by a general load other than the dark current load, and decreases to, for example, a minimum required capacity for starting the engine, the control of the cutoff control circuit 22 is performed. General load devices (electrical components) other than dark current loads provided in vehicles, etc.
Battery power supply to the system automatically stops (interrupts)
After turning off the engine, forgetting to turn off the lamps, which are battery load devices (electrical components),
Battery) due to continuous use of devices and the like is prevented. At least, at least the remaining battery capacity for starting the engine (operating the alternator) is ensured, so that the engine can be restarted.

The power supply stopping means 36, operating load device detecting means 38, total load current value calculating means 39, load current storing means 40, discharge end voltage detecting means 41, threshold generating means 42, voltage comparing means 35 and the key position detecting means 37 constitute one function (processing step) of the cutoff control circuit 22.

By the way, in step U14 of FIG. 8, the sum of the currents flowing through the load (loads other than the dark current load actually operating) calculated by the total load current value calculating means 39 (total load current value ), The discharge end voltage V _END is obtained. The details (an example) will be described below.

Generally, the relationship between the total load current and the discharge termination voltage can be expressed by the following equation (approximate equation). Accordingly, the discharge end voltage V _END is _calculated by the following approximate expression: V _END = −a · I + V _OPEN (Equation 1) V _END : Discharge end voltage V _OPEN : _Open end voltage of battery a: Proportion Constant (depending on the standard capacity of the battery) I: It can be obtained from the total load current I using the total load current.
Hereinafter, with reference to FIGS. 10 and 11, a method of calculating the discharge end voltage from the approximate expression by calculation will be described.

A secondary battery (battery) that can be reused by being charged needs to stop discharging at a predetermined closed circuit voltage in order to maintain its performance. This is because when the battery is unconditionally discharged (overdischarged), it becomes difficult for the active material of the electrode to return to its original state, and when this is repeated, the standard capacity of the battery decreases or the life is shortened. Become.

Generally, the voltage during battery discharge suddenly drops from a certain value to 0 V, which makes it unusable for use.
The voltage slightly before this voltage starts to drop suddenly is called the discharge end voltage. When the battery voltage becomes lower than this discharge end voltage, the use (discharge) is stopped, and if the battery is charged, the battery is excessively deteriorated. Can be prevented, and the original battery life can be used up effectively.

FIG. 10 is a graph showing the relationship between the discharge time in the discharge current of the battery, the battery voltage, and the discharge end voltage _VEND . FIG. 10 shows that the discharge current is I1,
.., In (n is a natural number, the same applies hereinafter), showing discharge characteristics for each discharge current. In each of the discharge characteristic graphs at each discharge current, the voltage slightly before the battery voltage V _BAT starts to drop sharply (a little ahead of the points k1, k2,..., Kn) is plotted on the graph as the discharge end voltage. When the points (discharge end voltage) plotted for each discharge characteristic graph are connected, as shown in FIG. 10, it can be seen that they are almost on one straight line l.

FIG. 1 shows the straight line 1 rearranged on a graph plane with the horizontal axis representing the discharge current and the vertical axis representing the discharge termination voltage.
3 is a graph showing a correlation between a discharge current and a discharge end voltage of the battery No. 1; From FIG. 11, it can be seen that there is a correlation (approximately proportional relationship) between the discharge current and the discharge end voltage V _END, and from this straight line l, the approximate expression shown in the above (Equation 1) can be derived. . Therefore, in the process of step U14 in the flowchart of FIG.
The end-of-discharge voltage V _END can be obtained by substituting and calculating the total load current value obtained in the preceding process into (Equation 1).

Finally, in the case where it is determined in step U9 that all of the switches S1, S2, S3, and S4 are off, the cutoff control circuit 22
Reads out the second threshold voltage (Vth2) as shown in FIG. 12 stored in the threshold voltage storage means 43 from the threshold voltage storage means 43 by a predetermined method (steps U9 and U19).
FIG. 12 is a graph showing the correlation between the discharge current of the battery and the correlation between the discharge current of the battery and the threshold.

Thereafter, the cutoff control circuit 22 reads the latest battery voltage from the battery voltage detecting means 31 (step U20), and the voltage comparing means 35 compares the second threshold voltage obtained at step U19 with the second threshold voltage. ,
The latest battery voltage obtained by the battery voltage detecting means 31 is compared with the latest battery voltage (step U21). If it is determined that the latest battery voltage is higher than the second threshold voltage, a wait is performed for a predetermined time (step U21). U22), the latest battery voltage is read from the battery voltage detecting means 31 again (step U20) and compared with the second threshold voltage obtained in step U19 (step U21).

If it is determined in step U21 that the latest battery voltage is equal to or lower than the second threshold voltage, the power supply stopping means 36 controls the RLY2 to be turned off to supply power to the load 3. It stops (step U23). At this time, the load 4 and the load 5 are not operating.

From the above, when the battery voltage becomes equal to or lower than a preset threshold voltage (Vth2 in this case) after the engine is stopped, supply of battery power to a load device (electrical component) provided in a vehicle or the like is performed. All are automatically stopped (cut off) by the control of the cutoff control circuit 21,
The battery can be prevented from running down. At least, at least, the remaining battery capacity for starting the engine (operating the alternator) is secured,
Restarting of the engine is possible.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 13 is a block diagram showing a third embodiment of a battery dead prevention device according to the present invention. In FIG. 13, a driving power source is supplied from a battery 1 (or an alternator (not shown)) via a RLY1 to a load 2, which is operable when the ignition key is in an ON position, and is constituted by, for example, a vehicle height control device or a fuel pump. Supplied.

Further, it can be operated when the ignition key (key SW) is in the ACC position, and can be operated when the ignition key is in the OFF position, for example, a load 4 constituted by a radio, an air cleaner (air cleaner) or the like. A load 5 composed of, for example, a clock or a room lamp is supplied with driving power from the battery 1 (or an alternator (not shown)) via a relay RLY3.

Further, a dark current load, which is an ECU load of the vehicle height control device, the radio, and the timepiece (as described above, is treated as a load different from the loads 2, 4, and 5 for simplicity of explanation). , Etc.) (for example, when the vehicle is exported overseas) (the engine is not started for a long time)
In the dark current load 3a such as the EFI, the air conditioner ECU, the door ECU, etc., which is not desired to cut off the battery power as much as possible, the battery 1 ( Alternatively, drive power is supplied from an alternator (not shown).

Similarly, among the dark current loads, which are the ECU loads of the vehicle height control device, the radio, and the timepiece, during transportation of the vehicle for overseas export, etc. (when the engine is not started for a long time).
In, the supply of battery power may be cut off,
The dark current load 3b of the air suspension ECU, traction control ECU, airbag ECU, etc.
USE2 and switch means (for example, transistor Tr2
Drive power is supplied from the battery 1 (or an alternator (not shown)) via a semiconductor switching element 47.

The on / off operation of RLY1, RLY3, Tr1, and Tr2 is controlled by a cutoff control circuit 23. The cutoff control circuit 23 is in a use state of the vehicle, that is, a transport state of overseas export (long term engine). Switch SW indicating a state in which the engine is not started) or a state of normal use of the user (a state in which the engine is not started for a long period of time, either regularly or irregularly).
1 ON / OFF and alternator ALT not shown
(L) On / off control of RLY1, RLY3, Tr1, and Tr2 is performed based on the operating state of the engine determined from the output.

Further, the cutoff control circuit 23 constantly detects the voltage of the battery 1 by the battery voltage detecting means 31, and based on the detected voltage value, the RLY
1, RLY3, Tr1, and Tr3 are turned on / off. In the above configuration, it goes without saying that the number and types of load devices mounted (mounted) by the vehicle increase or decrease (change). Next, the operation of the battery exhaustion prevention processing in the battery exhaustion prevention device of the present invention will be described with reference to the flowchart of FIG. FIG. 14 is a flow chart showing an example of the operation of the third embodiment of the battery exhaustion prevention device of the present invention.

The shutoff control circuit 23 stops the engine mounted on the vehicle or the like, that is, the alternator ALT (not shown).
When the output from (L) disappears (engine stop) is detected by the engine stop detecting means 44, the power supply stopping means 36 controls the RLY1 to be turned off, and the power supply to the load 2 is stopped. The supply is stopped (steps V1 and V2).

Next, the use state detecting means 32 outputs the FUSE
The use state of the vehicle is detected from the state of insertion / removal of Step 2. Current,
Assuming that the FUSE 2 is in a state of being removed, the use state detecting means 32 determines the current state of the vehicle in the transport state of overseas exports (a state in which the engine is not started for a long time).
Is determined to be. Based on the detection result, the cutoff control circuit 23 controls the Tr1 to be turned on via the power supply stopping means 36 to supply power to the dark current load 3a, and to control the RLY3 to be turned off to control the load 4, load 5 The supply of power to the power supply is stopped (steps V3 and V4).

Subsequently, the second threshold voltage (Vth2) as shown in FIG. 15 stored in the second threshold voltage storage means 45b by a predetermined method.
Is read from the second threshold voltage storage means 45b (step V5). Thereafter, the cutoff control circuit 23
Reads the latest battery voltage from the battery voltage detecting means 31 (step V6), and the voltage comparing means 35 obtains the second threshold voltage obtained in step V5 and the second threshold voltage obtained from the battery voltage detecting means 31. The battery voltage is compared with the latest battery voltage (step V7), and if it is determined that the latest battery voltage is higher than the second threshold voltage, after waiting for a predetermined time (step V8), the battery voltage detecting means 31 is again activated. Read the latest battery voltage (step V6),
A comparison is made with the second threshold voltage obtained in step V5 (step V7).

If it is determined in step V7 that the latest battery voltage is equal to or lower than the second threshold voltage, Tr1 is turned off by the power supply stopping means 36 to supply power to the load 3a. Stop (step V9). On the other hand, if it is determined in step V3 that the FUSE 2 has been inserted, the use state detecting means 32 changes the current vehicle state to a normal user use state (regular or irregular, That is, the engine is not started for a long time). Based on the detection result, the cutoff control circuit 23 uses a first method to store the first threshold voltage storage means 45.
The first threshold voltage (Vth1) as shown in FIG. 15 is read from the first threshold voltage storage means 45a (step V10).

Thereafter, the cutoff control circuit 23 reads the latest battery voltage from the battery voltage detecting means 31 (step V11), and the voltage comparing means 35 compares the first threshold voltage obtained at step V10 with the first threshold voltage. ,
The battery voltage is compared with the latest battery voltage obtained from the battery voltage detecting means 31 (step V12). If it is determined that the latest battery voltage is higher than the first threshold voltage, a wait is performed for a predetermined time (step V12). V13) The latest battery voltage is read from the battery voltage detecting means 31 again (step V11) and compared with the first threshold voltage obtained in step V10 (step V12).

If it is determined in step V12 that the latest battery voltage is equal to or lower than the first threshold voltage, the power supply stopping means 36 controls the relay 3 to be turned off, and the load 4 and the load 5 The supply of power is stopped (step V15). Thereafter, the shutoff control circuit 2
Reference numeral 3 denotes a third threshold voltage stored in the third threshold voltage storage means 45c by a predetermined method as shown in FIG.
Is read out from the third threshold voltage storage means 45c (step V15).

Subsequently, the cutoff control circuit 23 reads the latest battery voltage from the battery voltage detecting means 31 (step V16), and the voltage comparing means 35 compares the third threshold voltage obtained in step V15 with the third threshold voltage. ,
The latest battery voltage obtained by the battery voltage detecting means 31 is compared with the latest battery voltage (step V17). If it is determined that the latest battery voltage is higher than the third threshold voltage, a wait is performed for a predetermined time (step V17). V18), the latest battery voltage is read from the battery voltage detecting means 31 again (step V16) and compared with the third threshold voltage obtained in step V15 (step V17).

If it is determined in step V17 that the latest battery voltage is equal to or lower than the third threshold voltage, Tr1 and Tr2 are turned off by the power supply stopping means 36, and the dark current load 3a and the dark current load 3a are turned off. Current load 3
The supply of power to b is stopped (step V19).

FIG. 15 is a graph showing the discharge characteristics of the battery 1. Also, as is clear from FIG.
The first threshold voltage (Vth1) corresponds to, for example, the required battery capacity (for example, 80% of the remaining battery capacity) after the arrival of overseas export transportation (after the engine has not been started for a long time). Voltage value, and a third threshold voltage (Vth
In 3), for example, a voltage value corresponding to the energy (for example, the remaining battery capacity of 30%) to be supplied to the cell motor, which is the minimum necessary to start the engine by turning the cell motor, is set, and the second threshold is set. Hold voltage (Vt
h2) is, for example, the first threshold voltage (V
th1) and the third threshold voltage (Vth3)
Battery capacity (for example, the remaining battery capacity 60
%).

[0118]

As described above, according to the first aspect of the present invention, after the engine is stopped, the battery voltage is reduced to the second threshold voltage (Vth2) set in advance to prevent the battery from running out. In the following cases, the supply of the battery power to the load devices (electrical components) provided in the vehicle or the like is automatically stopped (cut off) under the control of the cutoff control circuit 21. A radio (an in-vehicle A) that is a load device (electrical component operable after the engine is stopped), for example, forgetting to turn off lamps or another load device (electrical component)
V equipment) can be prevented from running down due to continuous use.

Further, when the battery voltage becomes equal to or lower than a first threshold voltage (Vth1) which is set in advance after the engine is stopped in a state where the vehicle or the like is in a transportation system at the time of overseas export or the like, the vehicle is provided with the vehicle or the like. The supply of the battery power to the dark current load device is automatically stopped (including power supply to the general load device) under the control of the cutoff control circuit 21. When the state in the transportation system is released, various problems that may occur due to insufficient remaining battery capacity can be prevented.

According to the second aspect of the present invention, after the engine is stopped, the battery voltage becomes equal to or lower than the second threshold voltage (Vth2), and the battery voltage to the load device (electric component) provided in the vehicle or the like is changed. Immediately before the supply of power is stopped (cut off) by the control of the cutoff control circuit 21, the user is notified of the fact using sound, light, or the like, and the forced supply of power is stopped. Since the power supply is suddenly stopped while watching a radio or an on-vehicle AV device, it is possible to avoid discomfort where the user may be able to enjoy. .

According to the third aspect of the present invention, the current use state of the vehicle is determined by the operator or the user using the switch SW.
1 makes it possible for the battery rise prevention device to recognize the dark current load in a state where the vehicle or the like is left with the engine stopped for a long time (for example, in a transportation system for overseas export, etc.). It is possible to prevent the battery from being exhausted due to the above.

According to the fourth aspect of the present invention, when the vehicle is in a long-term transportation state, at least the remaining battery capacity corresponding to the threshold voltage stored in the first threshold voltage storage means a. Is secured,
When the vehicle is in the normal use state by the user, at least the remaining battery capacity corresponding to the threshold voltage stored in the second threshold voltage storage means 34b is secured. Even if there is a battery, it is possible to reliably prevent the battery from running down, and to use the battery effectively.

According to the fifth aspect of the present invention, not only is the general load 4 and 5 when the engine is stopped but the battery rises due to the use of the battery, but also the dark current load 3 when the engine is stopped is the battery. It is possible to prevent any rising of the battery which may occur by using the battery.

According to the sixth aspect of the present invention, since the stop state of the engine is detected from the key position of the ignition switch, the stop / start of the engine can be easily performed without adding new parts or circuits. The operating state can be detected. According to the invention described in claim 7,
After the engine is stopped, when the use state detection means 32 detects that the vehicle is in a state of transportation for overseas export (a state in which the engine is not started for a long time), the battery voltage is stored in the threshold voltage storage means 43. First
Is compared with the threshold voltage (Vth1), and when the battery voltage falls below the first threshold voltage due to the consumption of the battery capacity due to the dark current load 3, the load 3, the load 4, and the load 5 Since the supply of power is stopped, the battery 1 secures a voltage value corresponding to the required battery capacity, for example, after the arrival of overseas export transportation (after the engine has not been started for a long time). (Maintain).

According to the eighth aspect of the present invention, after the engine is stopped, the use state detecting means 32 causes the vehicle to be in a normal user use state (regularly or irregularly, but the engine is started for a long time). Not in a state that is not done)
Is detected, the remaining capacity of the battery 1 becomes
When consumed by a general load other than the dark current load, for example, when the capacity is reduced to the minimum necessary for starting the engine,
Under the control of the cutoff control circuit 22, the supply of the battery power to the general load devices (electrical components) other than the dark current load provided in the vehicle or the like is automatically stopped (cut off). It is possible to prevent the lamps that are (electric components) from being turned off and to prevent the battery from running down due to continuous use of the radio (such as in-car AV equipment).
At a minimum, the remaining battery capacity for starting the engine (operating the alternator) is ensured.

According to the ninth aspect of the present invention, after the engine is stopped, the power supply stopping means 36 emits a sound or light immediately before stopping the power supply to all the general loads. To notify the user, and to allow the user to interrupt the power supply forcibly, so that when the user is watching a radio or in-car AV equipment, the power supply is suddenly stopped. Is performed, it is possible to avoid discomfort where the user will enjoy.

According to the tenth aspect of the present invention, when the battery voltage becomes equal to or lower than the second threshold voltage (Vth2) set after the engine is stopped, a load device (particularly, The supply of the battery power to the dark current load device) is automatically stopped (cut off) by the control of the cutoff control circuit 22.
The battery can be prevented from running out, and at least the engine is started (alternator is operated) at least.
The remaining battery capacity for the operation.

According to the eleventh aspect of the present invention, the current use state of the vehicle is determined based on the ON / OFF state of the switch SW1, so that the state is conventionally performed when the vehicle is loaded and transported. Complicated work can be reduced as compared with the case without fuse. In addition, it is possible to greatly reduce the time and effort for managing the fuse after the fuse is removed.

According to the twelfth aspect of the present invention, the first threshold voltage is used for various operations performed before starting the engine when the state in which the engine of the vehicle is not started for a long time is released. Since the required battery capacity and the battery capacity necessary for starting the engine are set to a voltage value that secures the battery capacity and the second threshold voltage is set to at least a voltage value corresponding to the battery capacity necessary for starting the engine, It is possible to reliably prevent the battery from running down, regardless of whether the use state is a transport state for overseas export or a normal user use state.

According to the thirteenth aspect of the present invention, the stop state of the engine is detected from the key position (ACC or OFF position) of the ignition switch, so that new parts and circuits are not added.
The stop / operating state of the engine can be easily detected.

According to the fourteenth aspect of the present invention, since the discharge end voltage V _END can be calculated by performing a simple calculation, it reflects the characteristics of the battery such that the voltage value sharply decreases with time. Discharge end voltage V
_END can be easily and accurately calculated.

According to the fifteenth aspect of the present invention, a voltage value corresponding to the minimum amount of energy to be supplied to the starter motor to start the engine is set as the threshold voltage as the threshold value. Since the value is set to the added value, the consumption of the battery power can be suppressed before the remaining capacity of the battery decreases until the engine cannot be restarted.

According to the sixteenth aspect of the present invention, when the stop of the engine is detected and the state in which the engine of the vehicle is not started for a long time is detected (the fuse is removed), The power supply to all the plurality of general loads is stopped, and then the battery capacity is consumed by the first dark current load 3a, and the battery voltage is reduced to the second voltage.
The power supply to the first dark current load 3a is stopped when the voltage drops below the threshold voltage of the vehicle, so that when the engine of the vehicle is released from a state in which the engine is not started for a long time, the engine is turned off. The battery capacity required for various operations performed before starting and the battery capacity necessary for starting the engine can be secured (prevention of running out of battery).

According to the seventeenth aspect of the present invention, when the stop of the engine is detected and the vehicle is in a state of normal user use (regularly or irregularly, in a state where the engine is not started for a long time, If the battery voltage drops below the first threshold voltage, the supply of power to the plurality of general loads is stopped,
Further, when the battery voltage drops below the third threshold voltage, the supply of power to the second dark current load 3b is stopped.
The required battery capacity at the time of starting the engine can be secured (preventing the battery from running down).

According to the eighteenth aspect, after the engine is stopped, the power supply stopping means 36 emits a sound or a light immediately before stopping the supply of power to all the general loads. To notify the user, and to allow the user to interrupt the power supply forcibly, so that when the user is watching a radio or in-car AV equipment, the power supply is suddenly stopped. Is performed, it is possible to avoid discomfort where the user will enjoy.

According to the nineteenth aspect of the present invention, even if the dark current load is in a state where the engine of the vehicle is not started for a long time, the dark current load 3a to which the battery power is to be supplied as much as possible is used. When the engine of the vehicle is not started for a long time, the supply of the battery power is divided into the dark current load 3b which may be stopped, and the remaining battery capacity is supplied to the dark current load 3a preferentially. As a result, the remaining battery capacity can be effectively used.

According to the twentieth aspect, power is supplied via a relay to a load through which a relatively large current flows, and a semiconductor switching element is applied to a dark current load through which only a small current flows. Since the power is supplied through the battery, a reduction in the manufacturing cost of the battery drain prevention device can be expected.

According to the twenty-first aspect of the present invention, a plurality of threshold voltages having different voltage differences (set values) are provided, and power is supplied to an important load to the end. The capacity can be used effectively. According to the invention described in claim 22, there is an advantage that the use state detecting means 32 does not add a new component (such as the switch SW1) for detecting the state of the vehicle.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a battery running-down prevention device according to a first embodiment of the present invention.

FIG. 2 is a basic configuration diagram of a battery running-down prevention device according to a second embodiment of the present invention.

FIG. 3 is a diagram illustrating a basic configuration of a battery dead prevention device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a first embodiment of a battery rising prevention device according to the present invention.

FIG. 5 is a flowchart showing an example of the operation of the battery running-down prevention device according to the first embodiment of the present invention.

FIG. 6 is a graph showing discharge characteristics of the battery 1.

FIG. 7 is a block diagram showing a second embodiment of a battery dead prevention device according to the present invention.

FIG. 8 is a flowchart illustrating an example of an operation of the battery dead prevention device according to the second embodiment of the present invention.

FIG. 9 is a graph showing the discharge characteristics of the battery 1.

FIG. 10 is a graph showing discharge characteristics for each discharge current when the discharge current is changed.

FIG. 11 is a graph showing a correlation between a discharge current of a battery and a discharge end voltage.

FIG. 12 is a graph showing a correlation between a battery discharge current and a correlation between a battery discharge current and a threshold.

FIG. 13 is a block diagram showing a third embodiment of a battery dead prevention device according to the present invention.

FIG. 14 is a flowchart illustrating an example of an operation of the battery drain prevention device according to the third embodiment of the present invention.

FIG. 15 is a graph showing the discharge characteristics of the battery 1.

FIG. 16 is a block diagram showing an example of a conventional battery dead prevention device.

FIG. 17 is a simplified diagram of FIG. 16;

FIG. 18 is a flowchart showing an example of the operation of the conventional battery dead prevention device.

[Explanation of symbols]

1 Battery 2 Load (load operating in ON position) 3, 3a, 3b Load (dark current load) 4 Load (load operating in ACC position) 5 Load (load operating in OFF position) 21, 22, 23 Shutdown control Circuit (CPU) 31 Battery voltage detecting means 32 Usage state detecting means 33, 44 Engine stop detecting means 34a First threshold voltage storing means 34b Second threshold voltage storing means 35 Voltage comparing means 36 Power supply stopping means 37 Key Position detection circuit 38 Operating load device detection means 39 Total load current value calculation means 40 Load current storage means 41 Discharge end voltage detection means 42 Threshold generation means 43 Threshold voltage storage means 45a First threshold voltage storage means 45b Threshold 2 Voltage storage means 45c third threshold voltage storage means 46 switching means (Tr1) 47 switching means (Tr2) 48 control unit RLY1,2,3,4 relay (power supply line switching means) p1 key position signal p2 alternator output ( ALT
(L))

Claims (22)

[Claims] 1. A power supply line opening / closing means for various loads operated by a battery power supply after the engine is stopped.
A battery rise prevention device mounted on a vehicle that supplies the battery power, comprising: a battery voltage detection unit that detects a battery voltage; and a first threshold voltage that stores a voltage value corresponding to a first remaining battery capacity. Storage means; second threshold voltage storage means for storing a voltage value corresponding to a battery remaining capacity smaller than the first battery remaining capacity; use state detection means for detecting a use state of the vehicle; An engine stop detecting means for detecting that the engine has stopped, and an engine stop detecting means for detecting the stop of the engine by the engine stop detecting means. The threshold voltage is read out from the threshold voltage storage means of A voltage comparison unit that compares a threshold voltage with a battery voltage detected by the battery voltage detection unit; and when the battery comparison unit determines that the battery voltage is equal to or lower than the threshold voltage, the power supply line A power supply stopping device that controls opening / closing means and stops supplying power to all of the various loads. 2. A power supply stopping means for notifying a user of a power supply stop immediately before stopping power supply to all of the various loads, and interrupting the power supply stop. The device according to claim 1, further comprising: means. 3. The system according to claim 1, wherein said use state detecting means detects a current use state of said vehicle based on an on / off state of a switch indicated by the on / off state. Or the battery rising prevention device according to 2. 4. The switch, when on, indicates that the vehicle use state is in a long-term transport state, and when off, indicates that the vehicle use state is in a normal use state by a user. The voltage comparison unit reads a threshold voltage from the first threshold voltage storage unit when the switch is on, and compares the threshold voltage with the battery voltage detected by the battery voltage detection unit. Comparing, when the switch is off, reading a threshold voltage from the second threshold voltage storage means, and comparing the threshold voltage with the battery voltage detected by the battery voltage detection means. The battery rise prevention device according to claim 3, characterized in that: 5. A dark current load for supplying power regardless of a state in which the engine is stopped or running, and a power supply is performed in at least a state in which the engine is stopped. The device according to claim 4, wherein the device is configured by a general load. 6. The apparatus according to claim 1, wherein said engine stop detecting means detects a stop state of the engine from a key position of an ignition switch. 7. After the engine is stopped, battery power is supplied to a plurality of dark current loads via the first power supply line switching means, and battery power is supplied to the plurality of general loads via the second power supply line switching means. A battery voltage detecting means mounted on a vehicle for supplying a battery voltage, a battery voltage detecting means for detecting a battery voltage, and first and second threshold values corresponding to different first and second remaining battery capacities. Threshold voltage storage means for storing a voltage; use state detection means for detecting a use state of a vehicle; key position detection means for detecting a key position of an ignition switch and detecting that an engine is stopped from the key position An engine stop is detected by the key position detecting means, and the use state detecting means is If it is detected that the vehicle engine is not started for a long time, a first threshold voltage is read from the threshold voltage storage means, and the first threshold voltage and the battery voltage detection means are read out. And a voltage comparing means for comparing the battery voltage detected by the first power supply line switching means when the battery voltage is determined to be equal to or lower than the first threshold voltage. A power supply stop means for controlling and stopping the supply of power to the plurality of dark current loads. 8. A plurality of on / off switches provided for each of the plurality of general loads for operating or stopping each of the plurality of general loads, and an on state of each of the plurality of switches is detected and the operation is performed. Operating load device detecting means for detecting a medium load, load current storing means for storing a rated current flowing through each of the plurality of general loads, and a rated current flowing through each operating load detected by the operating load device detecting means. From the load current storage means,
Total load current value calculating means for adding only the rated current flowing through each load which is in the operating state at the time of the key position detected by the key position detecting means, and calculating a sum of the current flowing through the load; End-of-discharge voltage detection means for obtaining an end-of-discharge voltage from the sum of currents flowing through the load obtained by the value calculation means; Means for detecting the stop of the engine by the key position detecting means and detecting that the engine of the vehicle is not in a state in which the engine of the vehicle is not started for a long period of time by the use state detecting means. The battery voltage value is compared with the battery voltage value by the voltage comparing means. The power supply stopping means controls the second power supply line opening / closing means to stop supplying power to all of the general loads. The battery rise prevention device described. 9. A power supply stopping means for notifying a user that power supply is to be stopped immediately before stopping power supply to all of the general loads; and The battery stop prevention device according to claim 8, further comprising: means for interrupting the stop. 10. The engine stoppage is detected by the key position detection means, the use state detection means detects that the engine of the vehicle is not in a state in which the engine is not started for a long period of time, and the operating load device detection means detects all of them. If it is detected that the general load is not operating, the threshold voltage storage means
, And the second threshold voltage is compared with the battery voltage detected by the battery voltage detecting means by the voltage comparing means. When it is determined that the voltage is equal to or lower than the threshold voltage of 2, the power supply stopping means controls the first power line opening / closing means to stop supplying power to the plurality of dark current loads. The battery rising prevention device according to claim 8 or 9, wherein 11. The use state detection means detects a current use state of the vehicle by an on / off state of a switch for notifying the current use state of the vehicle based on the on / off state. Indicates that the use state of the vehicle is in a long-term transport state and the engine of the vehicle is not started for a long time, and when the vehicle is in an off state, the use state of the vehicle is in a normal use state by a user. 11. The device according to claim 7, wherein the engine of the vehicle is not in a state in which it is not started for a long time. 12. The first threshold voltage is:
When the state in which the engine of the vehicle is not started for a long time is released, the battery is set to a voltage value that secures a battery capacity necessary for various operations performed before starting the engine and a battery capacity necessary for starting the engine, 12. The battery rising prevention device according to claim 7, wherein the second threshold voltage is set to a voltage value that secures at least a battery capacity necessary for starting the engine. 13. The key position detecting means detects that the engine is running when the ignition switch is in the ON position, and the engine is stopped when the ignition switch is in either the OFF or ACC position. 13. The battery dead prevention device according to claim 7, wherein the battery is detected as being present. 14. The discharge end voltage detecting means, wherein the open end voltage of the battery is V _OPEN , the proportional constant depending on the standard capacity of the battery is a, and the total amount of the load current value is I. _14. The battery rising prevention device according to claim 7, wherein V _{END is determined} by the following equation: V _END = -aI + V _OPEN (Equation 1). 15. The threshold value generated by the threshold value generation means is a voltage value corresponding to the minimum amount of energy to be supplied to the starter motor required to start the engine, and the discharge end voltage. 15. The apparatus according to claim 8, wherein the value is set to a value obtained by adding a value to the battery. 16. After the engine stops, battery power is supplied to the first dark current load via the first fuse and the first power supply line switching means, and the second fuse is supplied to the second dark current load. A battery rising prevention device mounted on a vehicle that supplies battery power via a second power line opening / closing means and further supplies battery power to a plurality of general loads via a third power line opening / closing means. Battery voltage detecting means for detecting a battery voltage; first threshold voltage storing means for storing a threshold voltage corresponding to a first remaining battery capacity; and a threshold voltage corresponding to a second remaining battery capacity A second threshold voltage storing means for storing a threshold voltage corresponding to a third remaining battery capacity. Third threshold voltage storage means for storing, use state detection means for detecting the use state of the vehicle, engine stop detection means for detecting that the engine has stopped, and engine stop detection by the engine stop detection means. And when the use state detection means detects a state in which the engine of the vehicle is not started for a long time,
Power supply stopping means for controlling the third power line switching means to stop supplying power to all of the plurality of general loads; and reading a threshold voltage from the second threshold voltage storage means, A threshold voltage is compared with a battery voltage detected by the battery voltage detecting means. When it is determined that the battery voltage is equal to or less than the threshold voltage, the first voltage is supplied via the power supply stopping means. A battery comparing means for controlling power supply line switching means to stop supplying power to the first dark current load. 17. The voltage comparison means according to claim 1, wherein said engine stop detection means detects an engine stop and said use state detection means does not detect a state in which the vehicle engine is not started for a long time. When it is detected that there is no battery voltage, a threshold voltage is read from the first threshold voltage storage means, and the threshold voltage is compared with the battery voltage detected by the battery voltage detection means. When it is determined that the voltage is equal to or lower than the threshold voltage, the third power line opening / closing means is controlled via the power supply stopping means to stop supplying power to the plurality of general loads. The threshold voltage is read from the third threshold voltage storage means, and the threshold voltage is read. Comparing the threshold voltage with the battery voltage detected by the battery voltage detecting means, and when it is determined that the battery voltage has dropped to the threshold voltage or less, the second voltage is supplied via the power supply stopping means. 17. The battery dead prevention device according to claim 16, wherein a power supply line switching unit is controlled to stop supplying power to the second dark current load. 18. A method according to claim 1, wherein said power supply stopping means controls said third power supply line opening / closing means to stop supplying power to said plurality of general loads. 18. The apparatus according to claim 17, further comprising: means for notifying the power supply, and means for interrupting the stop of the power supply. 19. The dark current load as described above, wherein it is desired to supply battery power as much as possible even when the engine of the vehicle is not started for a long period of time. 20. The dark current load according to claim 16, wherein the second dark current load is a dark current load that may stop supplying battery power when the engine of the vehicle is not started for a long time. Battery rise prevention device. 20. The power supply line switching means according to claim 16, wherein said first and second power supply line switching means comprise semiconductor switching elements, and said third power supply line switching means comprises a relay. 20. The battery rising prevention device according to any one of claims to 19. 21. The first threshold voltage is higher than the second threshold voltage, the second threshold voltage is higher than the third threshold voltage, and the third threshold voltage is higher than the third threshold voltage. 20. The apparatus according to claim 16, wherein the voltage value is set to a voltage value corresponding to at least a minimum amount of energy to be supplied to the starter motor for starting the engine. 22. The use state detecting means detects that the engine is not started for a long time in a state where the second fuse is inserted, and a state where the second fuse is removed. 20. The apparatus according to claim 16, wherein the apparatus detects that the engine is not in a state in which the engine is not started for a long time.