JP2003226209A - Vehicular power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular power supply system capable of preventing battery exhaustion during vehicular traveling and parking. <P>SOLUTION: When a remaining capacity of a battery 1 becomes a predetermined first reference value or lower, a warning is issued by warning means 19 and 22. When the remaining capacity becomes a second reference value or lower, a first cutoff means 6 is driven and power supply to a first load group 30 including loads other than a traveling system is cut off. When the remaining capacity becomes a third reference value or lower, a second cutoff means 7 is driven and power supply to a second load group 60 including loads of the traveling system except important loads requiring power redundancy is cut off. When a theft detection signal is received from an anti-theft device 80, a third cutoff means 8 is driven and power supply to a third load group 70 including the important loads requiring power redundancy is cut off. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power supply system.

[0002]

2. Description of the Related Art A vehicle power supply system is disclosed in, for example, Japanese Unexamined Patent Publication No. 10-70844 and shown in the circuit diagram of FIG. In FIG. 2, the remaining capacity of the battery 14 after the engine is stopped is calculated based on the current value detected by the current value detecting means 50 and the voltage value detected by the voltage value detecting means 52. By the opening of the relays R1 to RY, the supply of the battery power to the loads A1 to AY which can be operated even when the ignition switch is in the off position is forcibly stopped by the time the capacity is reduced to the minimum required to restart the engine. By doing so, it is possible to prevent the battery from running out due to forgetting to turn off the headlights and interior lights during parking.

[0003]

However, in the above-described vehicle power supply system, it is possible to prevent the battery from depleting when parked, but many loads continue to operate while the vehicle is running, and the alternator's power generation capacity is sufficient. It is not possible to prevent the battery from running down while the vehicle is traveling due to the shortage of electricity to supply electricity from the battery.

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a vehicle power supply system capable of preventing the battery from running out while the vehicle is traveling and parking.

[0005]

The invention according to claim 1 made in order to solve the above-mentioned problems is a power supply system for a vehicle for supplying power from a battery mounted in the vehicle to a plurality of loads in the vehicle. Then, the remaining capacity calculation means for calculating the remaining capacity of the battery, the warning means for issuing a warning when the remaining capacity of the battery becomes less than or equal to a predetermined first reference value, and the plurality of loads among the plurality of loads. A first disconnection means for interrupting power supply to the first load group including loads other than the traveling system, and a traveling system load excluding an important load requiring redundant power supply from the plurality of loads. Including a second cutoff means for cutting off the power supply to the second load group, and cutting off the power supply to the third load group including an important load requiring the power supply redundancy among the plurality of loads. You When the remaining capacity of the third cutoff means and the battery becomes less than or equal to a predetermined second reference value that is lower than the first reference value or less, the first cutoff means is driven to drive the remaining capacity. Is below a second predetermined reference value that is lower than the second reference value, the first and second shutoff means are driven, and a theft detection signal from the antitheft device is received. And a drive means for driving the third shut-off means, and a power supply system for a vehicle.

According to another aspect of the present invention, there is provided a vehicle power supply system for supplying power from a battery mounted on a vehicle to a plurality of loads in the vehicle, and a remaining capacity calculation means for calculating a remaining capacity of the battery. , A power supply to a first load group including a warning means for issuing a warning when the remaining capacity of the battery becomes less than or equal to a predetermined first reference value and a load other than the traveling system among the plurality of loads. A first cutoff means for cutting off the power supply and a second power cutoff for cutting off the power supply to the second load group including the load of the traveling system excluding the important load requiring the redundant power supply among the plurality of loads.
Shutting off means, a third shutting off means for shutting off power supply to a third load group including an important load requiring a power source redundancy among a plurality of loads, and a remaining capacity of the battery is the first When it becomes less than or equal to a predetermined second reference value that is lower than the reference value or less, the first cutoff unit is driven, and the remaining capacity is lower than or equal to the second reference value or less and the predetermined third reference value or less. In the case of, when the first and second shutoff means are driven and the theft detection signal from the theft prevention device is received,
Since the vehicle is equipped with a driving means for driving the third shut-off means, it is possible to prevent the battery from running out of the vehicle, and in addition, secure power to an important load that requires redundant power supply, The anti-theft protection can be dealt with, and the life of the battery can be improved, so that the reliability of the vehicle power supply is improved.

The invention according to claim 2 made in order to solve the above-mentioned problem includes a remaining days calculation means for calculating the remaining days of the battery, and the warning means, when the ignition switch is turned on and off, 2. The vehicle power supply system according to claim 1, wherein the number of days left to be left calculated by the number of days left to leave calculation is displayed.

According to the second aspect of the present invention, it includes a negligible day number calculating means for calculating the number of negligible days of the battery, and the warning means is calculated by the negligible day number calculating means when the ignition switch is turned on and off. By displaying the number of days that can be left unattended, the user can be prompted to charge the battery before the battery runs out.

In order to solve the above-mentioned problems, the invention according to claim 3 is characterized in that the warning means includes the first,
The power supply system for a vehicle according to claim 1, wherein the shut-off state by the second or third shut-off means is notified by a warning having a different form from the warning.

According to the third aspect of the invention, the warning means notifies the interruption state by the first, second or third interruption means by a warning of a form different from the warning, so at what stage the remaining capacity of the battery is. You can tell if there is.

In order to solve the above-mentioned problems, the present invention according to claim 4 includes a current detecting means for detecting a current flowing through the battery and a voltage detecting means for detecting a voltage of the battery, and the remaining capacity. 4. The calculation means calculates the remaining capacity of the battery based on a current detection signal from the current detection means and / or a voltage detection signal from the voltage detection means. The power supply system for a vehicle described in the item.

According to another aspect of the present invention, the remaining capacity calculating means includes current detecting means for detecting a current flowing through the battery and voltage detecting means for detecting the voltage of the battery. Since the remaining capacity of the battery is calculated based on the signal and / or the voltage detection signal from the voltage detection means, it is possible to prevent the battery from depleting with the required accuracy.

In order to solve the above-mentioned problems, the present invention according to claim 5 includes a current detecting means for detecting a current flowing through the battery, and the driving means receives a current detection signal from the current detecting means in advance. When it is larger than the predetermined first reference value, the first cutoff means is driven, and the current detection signal from the current detection means is larger than the first reference value, which is larger than the predetermined second reference value. When it is larger, the first and second drive means are driven, and the vehicle power supply system according to any one of claims 1 to 3 is characterized.

According to a fifth aspect of the present invention, the current detecting means for detecting the current flowing through the battery is included, and the driving means has a current detection signal from the current detecting means greater than a predetermined first reference value. , Driving the first cutoff means and the current detection signal from the current detection means is larger than the first reference value and is larger than a predetermined second reference value,
Since the first and second drive means are driven, it is possible to avoid damage due to a large current flowing through the wire harness.

In order to solve the above-mentioned problems, the invention according to claim 6 is characterized in that the warning means has a first reference value or a second reference value with which the current detection signal from the current detection means is predetermined. When it is larger than the warning, the shut-off state by the first or second shut-off means is notified by a warning having a different form from the warning.

In a sixth aspect of the present invention, the warning means has a first or a second reference when the current detection signal from the current detection means is larger than a predetermined first reference value or a second reference value. Since the state of interruption by the interruption means is notified by a warning of a form different from the warning, it can be informed that the power is interrupted by an abnormally large current.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of a vehicle power supply system according to the present invention. In FIG. 1, the vehicle power supply system includes a battery 1, an alternator 2, and a power supply distribution box 3. The power distribution box 3 includes a battery management ECU (electronic control unit) (hereinafter simply referred to as an ECU) 4 that functions as a remaining capacity calculating unit, a voltage detecting unit, and a driving unit, a fusible link 5, and first and second units, respectively. And load power cutoff latch relays 6, 7, and 8 that act as third shutoff means, a current sensor 9 that acts as current detection means, and fuses 10 to 10.
18 and.

The battery 1 is composed of a lead battery or the like, and is connected to the alternator 2 and the load power cutoff latch relay 6 via the fusible link 5. The load power cutoff latch relay 6 has an exciting coil 6a and a relay switch 6b. The exciting coil 6a is connected between the fusible link 5 and the ECU 4, and the relay switch 6b.
Is the fusible link 5 and the fuses 11, 12, 13
Connected between.

The battery 1 is also connected to a load power cutoff latch relay 7. The load power cutoff latch relay 7 has an exciting coil 7a and a relay switch 7b, the exciting coil 7a is connected between the battery 1 and the ECU 4, and the relay switch 7b is connected between the battery 1 and the fuses 15 and 16. Has been done.

The battery 1 is also connected to a load power cutoff latch relay 8. The load power cutoff latch relay 8 has an exciting coil 8a and a relay switch 8b, the exciting coil 8a is connected between the battery 1 and the ECU 4, and the relay switch 8b is connected between the battery 1 and the fuses 17 and 18. Has been done. Furthermore, the battery 1 is connected to the ECU 4 via the fuse 10.

The ECU 4 includes a CPU, a ROM and a RAM.
And a load power cutoff latch relays 6, 7, 8 and a fuse 10, a current sensor 9 for detecting a current flowing through the plus line of the battery 1, and a display unit functioning as a warning unit. 19 and the alarm unit 20, the communication line 21, and the theft prevention device 80.

The fuses 11, 12, and 13 are respectively
It is connected to the loads 31, 32 and 33. Load 31,3
Reference numerals 2 and 33 are systems other than the traveling system, such as a power window and an air conditioner, which are not directly related to running, turning, and stopping. The systems other than the traveling systems are collectively included in the first load group 30. I will call it.

The fuses 15 and 16 are respectively connected to the load 6
1, 62 are connected. The loads 61 and 62 are, for example, traveling system systems such as EFY (engine control computer), ETC, and power steering (except for important systems that require redundant power supply described later). Will be collectively referred to as the second load group 60.

The fuses 17 and 18 are respectively connected to the load 7
1, 72 are connected. The loads 71 and 72 are, for example, important systems that require power supply redundancy, such as brakes and night headlights, and these important systems that require power supply redundancy are collectively referred to as a third load group 70. To do.

The anti-theft circuit 80 sends a theft detection signal in response to an abnormality detection signal from the door opening / closing sensor 81, the shock sensor 82, and the other sensor 83 such as a voltage sensor in the anti-theft mode, which cannot occur under normal conditions. ECU4
Supply to.

Next, the operation of the vehicular power supply system having the above configuration will be described. To summarize the operation of the above-described configuration, the ECU 4 determines the state of the battery 1 based on the current detection signal from the current sensor 9 and the voltage detection signal indicating normality / abnormality of the power source and the battery line via the fuse 10. Deterioration, dischargeable capacity, etc.) are detected (calculated) to prevent battery drain, secure power supply to important loads that require power supply redundancy, and avoid wire harness damage due to abnormally large current. It is possible to optimally charge and discharge the battery 1 while grasping the state of, and thereby the life of the battery 1 can be extended.

The operation described above will be described in detail below.
Under normal conditions, the remaining capacity of the battery 1 is calculated based on the current detection signal from the current sensor 9 and the voltage detection signal from the fuse 10, the state of the calculated remaining capacity is monitored, and power is supplied to each load. If it is within a sufficient range, the exciting coils 6a, 7 of the load power cutoff latch relays 6, 7, 8
a, 8a to drive each relay switch 6b, 7b, 8
It is controlled so that b is turned on. As a result, the loads 31 to 33, 61 to 62, 71 to 72 are supplied with power from the battery 1 during parking and from the battery 1 and the alternator 2 during traveling.

Next, the battery depletion prevention during traveling or parking will be described.
The ECU 4 calculates the remaining capacity of the battery 1 based on the current detection signal from the current sensor 9 and the voltage detection signal from the fuse 10, and the remaining capacity is determined by a first reference value (a capacity required for engine starting and When the value becomes less than or equal to (a value indicating the capacity that takes into consideration the natural capacity reduction within the set number of days that the vehicle can be left unattended), the remaining capacity of the battery 1 is displayed in the display unit 19 including the indicator in the meter and the alarm unit 20 including the buzzer. Is displayed below the first reference value (transmitted), and when the ignition switch (not shown) is turned on and off, the display unit 1
Display the number of days left to leave on 9.

After that, when the remaining capacity of the battery 1 further decreases below a predetermined second reference value lower than the first reference value, the ECU 4 causes the exciting coil 6a of the power cutoff latch relay 6 to operate. Of the load 31, 32, 33 included in the first load group 30 (that is, not directly related to running, bending, or stopping, other than the running system) by stopping the driving of the relay switch 6b and latching the relay switch 6b off. Power supply to the system).

Further, the ECU 4 determines that the remaining capacity of the battery 1 is lower than the second reference value by a predetermined third value.
When the value becomes less than the reference value of, the driving of the exciting coil 7a of the power cutoff latch relay 7 is stopped and the relay switch 7b is latched off while maintaining the cutoff of the power supply to the first load group 30. By doing so, the loads 61 and 62 (that is, the loads included in the second load group 60)
It also shuts down the power supply to traveling systems other than important systems that require redundant power supply.

As a result, even when the vehicle is running, many loads continue to operate, and even if the battery 1 is supplying power because the capacity of the alternator 2 is insufficient due to the amount of power generation, the battery can be prevented from running down as much as possible.

Next, the securing of the power supply to the important load requiring the power supply redundancy, that is, the loads (eg, the loads 71 and 72) included in the third load group 70 will be described. Based on the current detection signal from the fuse and the voltage detection signal from the fuse 10, the deterioration of the battery 1, the dischargeable capacity, etc. are calculated, and the power supply to the important system requiring the power supply redundancy is secured.

That is, when it is almost impossible to secure the power supply (that is, when the remaining capacity of the battery 1 becomes equal to or less than the second reference value), the ECU 4 controls the exciting coil 6a of the power cutoff latch relay 6 to operate. The drive is stopped, the relay switch 6b is latched off, and the loads 31, 32, and 33 included in the first load group 30 (that is, systems other than the traveling system that are not directly related to running, bending, or stopping) Cut off the power supply to.

Further, when the power supply cannot be ensured (that is, when the remaining capacity of the battery 1 is further reduced to a third reference value which is lower than the second reference value or less), the ECU 4 The load included in the second load group 60 is stopped by stopping the driving of the exciting coil 7a of the power cutoff latch relay 7 and latching the relay switch 7b off while maintaining the cutoff of the power supply to the first load group 30. The power of 61, 62 (that is, the traveling system other than the system that requires the redundant power supply and is important) is shut off by turning off the power shutoff latch relay. The power supply to the loads (for example, the loads 71 and 72) included in the load group 70 of 3 is secured.

When the battery 1 is determined to be abnormal, a warning is output to the display unit 19 including an in-meter indicator and the alarm unit 20 including a buzzer to indicate that the battery 1 should be replaced.

Explaining how to avoid damage to the wire harness, the ECU 4 detects the abnormal large current and the large inrush current based on the current detection signal from the current sensor 9, and determines the large current to be predetermined. If it is larger than the reference value of 1, the driving of the exciting coil 6a of the power cutoff latch relay 6 is stopped, the relay switch 6b is latched off, and the loads 31, 3 included in the first load group 30 are stopped.
The power supply to 2, 33 (that is, the system other than the traveling system, which is not directly related to running, turning, and stopping) is shut off.

When the abnormal large current is higher than the predetermined second reference value which is higher than the first reference value, the ECU 4 maintains the interruption of the power supply to the first load group 30, Excitation coil 7a of power cutoff latch relay 7
Of the load 61, 62 included in the second load group 60 by stopping the driving of the relay switch 7b and latching the relay switch 7b off.
(That is, the power supply to the traveling system other than the system that requires the power supply redundancy and is important) is cut off.

As a result, it is possible to prevent damage due to a large current flowing through the wire harness.

Further, when the ECU 4 receives a theft signal from the antitheft device 80, the power cutoff latch relay 8
Driving of the exciting coil 8a of the relay switch 8b is stopped.
Is turned off to shut off the power supply to the loads 71 and 72 included in the third load group 70 (that is, an important system that requires power supply redundancy and includes a starter motor and the like). This makes it impossible to start or run the vehicle and prevent the vehicle from being stolen.

As described above, according to the present invention, by providing the vehicle power supply system utilizing the battery management ECU 4, it is possible to prevent the vehicle battery from becoming dead and to secure the power supply to an important load which is considered to require power supply redundancy. Also, it is possible to prevent damage to the wire harness, prevent theft of the vehicle, and extend the life of the battery, thereby improving reliability as a vehicle power supply.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and applications are possible.

For example, as an added value of battery management in the vehicle power supply system of the present invention, charging,
The battery 1 is sent to the ECU that executes various functions such as starting, regeneration, idle stop control, and the like to know the state of the battery.
The fuel consumption can be improved by transmitting the above state through the communication line 21.

Further, in the above-described embodiment, the battery 1
The remaining capacity of is calculated based on the current detection signal from the current sensor 9 and the voltage detection signal from the fuse 10. However, it is calculated only from either the current detection signal from the current sensor 9 or the voltage detection signal from the fuse 10. It may be configured to do so.

Further, in the above-described embodiment, the battery 1
When the remaining capacity of the battery becomes less than or equal to a predetermined first reference value, a warning is issued to the display unit 19 and the alarm unit 20, but not limited to this, the remaining capacity of the battery 1 is predetermined. When the second reference value or the third reference value or less, or when the abnormal large current becomes the first or second reference value or more, the display unit 19 and the alarm unit 20,
In each case, the remaining capacity of the battery 1
The warning may be provided in a form different from the warning when the value becomes equal to or less than the reference value.

[0045]

According to the first aspect of the present invention, it is possible to prevent the battery of the vehicle from being exhausted, and in addition, secure power to an important load that requires redundant power supply, and also steal the vehicle. The prevention as a result and the improvement of the battery life improve reliability as a vehicle power supply.

According to the second aspect of the present invention, the user can be prompted to charge the battery before the battery runs out.

According to the third aspect of the invention, it is possible to inform at what stage the remaining capacity of the battery is.

According to the fourth aspect of the present invention, it is possible to prevent battery exhaustion with a required accuracy.

According to the fifth aspect of the present invention, it is possible to avoid a damage caused by a large current flowing through the wire harness.

According to the sixth aspect of the present invention, it is possible to notify that the power is shut down due to an abnormally large current.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a vehicle power supply system according to the present invention.

FIG. 2 is a circuit diagram showing an example of a conventional vehicle power supply system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Battery 4 Battery management ECU (remaining capacity calculation means; voltage detection means; drive means) 6 Power interruption latch relay (first interruption means) 7 Power interruption latch relay (second interruption means) 8 Power interruption latch relay (first 3 interruption | blocking means) 9 current sensor (current detection means) 19 display part (a part of warning means) 20 alarm part (a part of warning means) 30 1st load group 60 2nd load group 70 3rd load Group 80 anti-theft device

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) G08B 13/00 G08B 13/00 B 21/00 21/00 C H01M 10/44 H01M 10/44 P 10 / 48 10/48 P H02J 7/00 302 H02J 7/00 302DF Term (reference) 5C084 AA04 AA09 BB16 EE06 5C086 AA32 BA22 CA02 CA03 DA04 DA40 EA05 5G003 BA01 DA02 DA14 EA05 FA06 GC05 5H030 AA04 BB21 FF42 FF42FF43FF43

Claims (6)

[Claims] 1. A vehicle power supply system for supplying power from a battery mounted on a vehicle to a plurality of loads in the vehicle, the remaining capacity calculating means for calculating a remaining capacity of the battery, and the remaining capacity of the battery. When the value becomes equal to or less than a first predetermined reference value, a warning means for issuing a warning and a load other than the traveling system among the plurality of loads are included.
Power supply to a second load group including a first disconnection means for cutting off power supply to the second load group, and a traveling load excluding an important load requiring redundant power supply from the plurality of loads. A second shut-off means for shutting off power supply to a third load group including an important load requiring the power source redundancy among the plurality of loads; When the remaining capacity becomes less than or equal to the predetermined second reference value that is lower than the first reference value or less, the first cutoff unit is driven, and the remaining capacity is lower than the second reference value or less. When the value becomes less than or equal to a predetermined third reference value, the first and second shutoff means are driven, and when the theft detection signal from the antitheft device is received, the third value is set.
A power supply system for a vehicle, comprising: a drive unit that drives the shut-off unit. 2. The battery according to claim 1, further comprising a remaining days calculation means for calculating the remaining days of the battery, wherein the warning means displays the remaining days calculated by the left days calculation means when the ignition switch is turned on and off. The power supply system for a vehicle according to claim 1, wherein: 3. The power supply system for a vehicle according to claim 1, wherein the warning means notifies the interruption state by the first, second or third interruption means by a warning having a different form from the warning. . 4. A current detection means for detecting a current flowing through the battery, and a voltage detection means for detecting a voltage of the battery, wherein the remaining capacity calculation means includes a current detection signal from the current detection means and / or 4. The vehicle power supply system according to claim 1, wherein the remaining capacity of the battery is calculated based on a voltage detection signal from the voltage detection means. 5. A current detecting means for detecting a current flowing through the battery, wherein the drive means is configured to detect the first current when the current detection signal from the current detecting means is larger than a predetermined first reference value. Driving the breaking means, and driving the first and second driving means when the current detection signal from the current detecting means is larger than the second reference value which is larger than the first reference value. The power supply system for a vehicle according to any one of claims 1 to 3, wherein 6. The warning means shuts off by the first or second shutoff means when a current detection signal from the current sensing means is larger than a predetermined first reference value or a second reference value. The vehicle power supply system according to claim 5, wherein the state is notified by a warning having a different form from the warning.