JP2003226208A - Vehicular power supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular power supply system capable of preventing battery exhaustion while securing operation of a system which is never to be shut down. <P>SOLUTION: The vehicular power supply system supplies power to a plurality of loads in a vehicle from a battery mounted on the vehicle, and it is provided with a battery management means 4 constantly supplied with power from the battery 1 and connected with an input part 90 and an output part 100 relevant to the system which is never to be shut down, a vehicular stoppage detecting means 27 detecting stoppage of the vehicle, and cutoff means 6 and 7 cutting off power supply to all loads 30 and 60 of the plurality of loads except the battery management means 4. The battery management means 4 drives the cutoff means 6 and 7 when vehicular stoppage is detected by the vehicular stoppage detecting means 27. <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, for example, in Japanese Patent Laid-Open No. 10-70844 and is shown in the block 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 detection means 50 and the voltage value detected by the voltage detection means 52, and the calculated battery remaining capacity is calculated as follows. So as to forcibly stop the supply of the battery power to the loads A1 to An that can be operated even in the off position of the ignition switch by opening the relays R1 to Rn before the capacity is reduced to the minimum necessary for reactivating 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 when parking.

[0003]

However, in the above-described vehicle power supply system, a system in which power is supplied from the battery and does not want to be shut off in any case, such as a security-related system, is provided in the vehicle. If present, many input switches and output loads related to the security-related system are scattered, so that the load forcibly cutting off the battery power supply by the relay is substantially reduced, and it is difficult to prevent the battery from running down.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a vehicular power supply system capable of preventing the battery from running down while ensuring the operation of the system in which the power supply should not be shut off.

[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. A battery management means in which the system-related input section and output section that require constant power supply are connected, and the power is always supplied from the battery,
A vehicle stop detection means for detecting a stop of the vehicle, and a shutoff means for shutting off power supply to all loads other than the battery management means among the plurality of loads, the battery management means is provided for detecting the vehicle stop. The vehicle power supply system is characterized in that when the vehicle stop is detected by the means, the shutoff means is driven.

According to a first aspect of the present invention, there is provided a vehicle power supply system for supplying power from a battery mounted on the vehicle to a plurality of loads in the vehicle, and an input section and an output related to the system which require constant power supply. Parts are connected and power is constantly supplied from the battery, vehicle stop detection means for detecting vehicle stop, and power supply to all loads other than the battery management means among a plurality of loads is cut off. The battery management means drives the interruption means when the vehicle stop is detected by the vehicle stop detection means.Therefore, all the systems that do not want to interrupt the power supply should be scattered as in the conventional case. Without being connected to one battery management means at a time, its operation can be secured without power interruption, Both of battery exhaustion can be prevented, thereby improving the reliability of the power supply for a vehicle.

The invention according to claim 2 made in order to solve the above-mentioned problem is a power supply system for a vehicle for supplying power to a plurality of loads in the vehicle from a battery mounted in the vehicle, wherein the remaining battery is used. A remaining capacity calculation means for calculating the capacity, a warning means, a first cutoff means for cutting off the power supply to the first load group including a load other than the traveling system among the plurality of loads, Second shutoff means for shutting off the power supply to the second load group including the load of the traveling system among the loads, the vehicle stop detection means for detecting the stop of the vehicle, and the system related to the constant power supply. The battery management means 4 is connected to the input part and the output part of the battery and is constantly supplied with power from the battery. When the value becomes equal to or lower than the predetermined first reference value, a warning is output to the warning means, and the remaining capacity of the battery becomes equal to or lower than a predetermined second reference value that is lower than the first reference value or lower. If
The first cut-off means is driven, and the remaining capacity is the second capacity.
When the value is less than or equal to a predetermined third reference value that is lower than the reference value of 1 or less or when a vehicle stop is detected by the vehicle stop detecting means, the first and second cutoff means are driven. It exists in the vehicle power supply system.

According to a second aspect of the present invention, there is provided a vehicle power supply system for supplying power from a battery mounted on the vehicle to a plurality of loads in the vehicle, and a remaining capacity calculating means for calculating a remaining capacity of the battery. , Warning means,
A first cutoff unit that cuts off power supply to the first load group including a load other than the traveling system among the plurality of loads;
A second cutoff unit that cuts off power supply to a second load group including a load of a traveling system among a plurality of loads, a vehicle stop detection unit that detects a stop of the vehicle, and a system that requires constant power supply. The battery management means has associated input and output parts connected to it, and is constantly supplied with power from the battery, and the battery management means has a battery remaining capacity of a predetermined reference value or less. In this case, the warning is output to the warning means, and when the remaining capacity of the battery becomes equal to or lower than the second reference value that is lower than the first reference value and is determined in advance, the first cutoff means is driven to determine the remaining capacity. When it becomes less than or equal to a predetermined third reference value lower than the second reference value or less, or when the vehicle stop is detected by the vehicle stop detecting means, the first and second shutoff means are operated. Since all the systems that do not want to shut down the power by all means are connected to one battery management means collectively without being scattered like the conventional one, its operation can be secured without shutting down the power, By shutting off the power supply to the load, it is possible to prevent the vehicle battery from running down, and the reliability of the vehicle power supply is improved.

The invention according to claim 3 made in order to solve the above-mentioned problem includes an unusable day number calculating means for calculating the number of unusable days of the battery, and the warning means, when the ignition switch is turned on and off, 3. The vehicle power supply system according to claim 2, wherein the number of days left to be left calculated by the number of days left to leave calculation is displayed.

According to the third 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 4 is characterized in that the warning means includes the first,
3. The vehicle power supply system according to claim 2, wherein the shut-off state by the second or third shut-off means is notified by a warning different from the warning.

In the invention according to the fourth aspect, 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 5 includes current detecting means for detecting a current flowing through the battery, and voltage detecting means for detecting the voltage of the battery, and the remaining capacity. 5. The calculating 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 a fifth aspect of the present invention, the remaining capacity calculating means 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 calculating means detects the current from the current detecting means. 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 invention according to claim 6 includes a current detection means for detecting a current flowing through the battery, and the battery management means receives a current detection signal from the current detection means. If it is larger than a 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. If it is larger, the vehicle power source system according to any one of claims 2 to 4 is characterized in that the first and second means are driven.

According to another aspect of the invention, the battery management means includes a current detection means for detecting a current flowing through the battery, and the battery management means has a current detection signal from the current detection means larger than a predetermined first reference value. In this case, the first cutoff means is driven, and when the current detection signal from the current detection means is larger than the second reference value which is larger than the first reference value, the first and second means means are driven. Therefore, it is possible to avoid a vehicle malfunction, for example, a damage caused by a large current flowing through the wire harness.

According to a seventh aspect of the present invention, which is made to solve the above-mentioned problems, the warning means has a first reference value or a second reference value for which a current detection signal from the current detection means is predetermined. If it is larger than the above, the shut-off state by the first or second shut-off means is notified by a warning having a different form from the warning, and the vehicle power supply system according to claim 6 is present.

According to a seventh aspect of the present invention, the warning means includes the first or second warning signal 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.

[0019]

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 calculation unit, a voltage detection unit, and a battery management unit, a fusible link 5, and a cutoff unit. The load power cutoff latch relays 6 and 7 functioning as first and second disconnecting means, the current sensor 9 functioning as current detecting means, and the fuses 10 to 16.

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 ECU 4 includes a CPU, ROM and RAM
In addition to the load power cutoff relays 6 and 7 and the fuse 10 described above, a current sensor 9 for detecting a current flowing through the plus line of the battery 1, a display unit 19 serving as a warning unit, and an alarm are provided. The unit 20, the communication line 21, the traveling sensor 27 as a vehicle stop detection unit, the system-related input unit 90 that requires constant power supply (in other words, do not want to cut off the power supply), and the system that requires constant power supply. It is connected to the related output unit 100.

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 systems that do not want to shut off the power supply, which will be described later). Collectively referred to as the second load group 60.

The above-mentioned load groups 30 and 60 also include an electronic control unit (that is, all ECUs other than the ECU 4) for controlling the loads in the group, which is not shown.

The traveling sensor 27 is attached to, for example, an axle, and supplies a detection signal to the ECU 4 when the vehicle is traveling.

The system-related input section 90 that does not want to shut down the power supply is, for example, an input switch or the like related to a system or the like that executes a security function or an immobilizer function which should be always operable in terms of its function. System related output section 10
Reference numeral 0 is an output unit related to a system that executes the security function and the immobilizer function described above.

Next, the operation of the vehicular power supply system having the above configuration will be described. In the above-mentioned configuration, the operation thereof is summarized. The ECU 4 detects whether the current detection signal from the current sensor 9 is normal or the battery line normality via the fuse 10.
By detecting (calculating) the state (deterioration, dischargeable capacity, etc.) of the battery 1 based on the voltage detection signal indicating the abnormality, it is possible to prevent the battery from running out and avoid the vehicle malfunction due to the abnormal large current. Performs battery management functions.

In addition to the above-mentioned battery management function, the ECU 4 collectively controls systems such as a security function which should not be shut off, so that when an abnormality or insufficient capacity of the battery 1 is detected. , EC
The power supply to all loads other than U4 can be cut off, and the performance is further improved as a battery depletion prevention in consideration of an actual vehicle. Further, the ECU 4 can optimally charge and discharge the battery 1 while grasping the state of the battery 1, and thus the life of the battery 1 can be improved.

The above operation will be described in detail below.
Operates by being constantly supplied with power from the battery 1 through the fuse 10, and monitors the power supply voltage to obtain a voltage detection signal indicating normal / abnormal battery line.
Then, the ECU 4 normally 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, monitors the state of the calculated remaining capacity, and monitors the load. If the power supply is within a sufficient range, the exciting coils 6a, 7a of the load power cutoff latch relays 6, 7 are driven to make the relay switches 6b, 7
It is controlled so that b is turned on. As a result, each of the loads 31 to 33, 61 to 62 has a battery 1 during parking.
From the battery 1 and the alternator 2 when traveling
Power is supplied from.

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.

Thereafter, when the remaining capacity of the battery 1 becomes smaller than a predetermined second reference value which is lower than the first reference value, the ECU 4 then activates the exciting coil 6a of the power cutoff latch relay 6. 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) (that is,
Also shut off the power supply to running systems other than the system that you do not want to shut down.

As a result, a large amount of load continues to operate during traveling, and even when the power is supplied from the battery 1 due to the insufficient capacity of the alternator 2, the battery can be prevented from running down as much as possible.

Next, when the vehicle is parked, that is, when the vehicle is stopped, the ECU 4 detects the vehicle stop due to the absence of the detection signal from the traveling sensor 27, and the excitation coils 6a, 6a Stop driving 7a,
By latching the relay switches 6b and 7b off, all loads (that is, loads 31, 32, 33, 61, 6) other than the system in which the power supply is not desired to be shut off by any means
(Including 2) is cut off. That is, regardless of the remaining capacity of the battery 1 during parking, to all loads other than the system that does not want to shut down the power (including the loads 31, 32, 33, 61, 62 and ECUs other than the ECU 4). Since the power supply of is shut off, it is possible to prevent the battery from running down as much as possible.

On the other hand, the system-related input section 90 that does not want to shut down the power and the system-related output section 100 that does not want to shut down the power are collectively connected to the ECU 4 that is always supplied with power from the battery 1. , The security function and the immobilizer function are executed regardless of the remaining capacity of the battery 1. With such a configuration, after the power cutoff latch relays 6 and 7 are turned off, the load connected to the battery 1 is not connected to the ECU 4
Only as a result, the performance is further improved as the battery is prevented from running out.

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

The avoidance of the vehicle malfunction due to the abnormal current will be described below. When the ECU 4 detects an abnormal large current or a large collision current based on the current detection signal from the current sensor 9, the large current is predetermined. If it is larger than the first reference value, the drive of the exciting coil 6a of the power cutoff latch relay 6 is stopped, the relay switch 6b is latched off, and the load 31, which is included in the first load group 30,
The power supply to 32, 33 (that is, a system other than the running system, which is not directly related to running, turning, or 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 in which the power supply is not desired to be cut off) is cut off.

Accordingly, it is possible to prevent a vehicle malfunction due to an abnormally large current and a collision current at the time of collision, for example, a damage caused by a large current flowing through the wire harness.

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 battery of the vehicle from running down while ensuring the operation of the system which should not be shut down.
It is possible to avoid a vehicle malfunction due to an abnormal current and also improve the battery life, so that the reliability of the vehicle power source is improved.

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 the 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.

Further, the vehicle stop detecting means detects the vehicle stop by the absence of the detection signal from the traveling sensor, but the invention is not limited to this, and the vehicle stop detecting means may detect the vehicle stop by turning off the ignition key.

[0047]

According to the first aspect of the present invention, all the systems which do not want to shut off the power supply are connected to one battery management means and are shut off without being scattered as in the conventional system. The operation can be ensured without being carried out, the battery exhaustion of the vehicle can be prevented, and the reliability of the vehicle power source is improved.

According to the second aspect of the present invention, all the systems that do not want to shut down the power by all means are connected to one battery management means in a lump without being scattered as in the conventional system, and are not shut down. The operation can be secured, and the battery of the vehicle can be prevented from running dead by cutting off the power supply to the load in stages.
The reliability as a vehicle power supply is improved.

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

According to the invention described in claim 4, it is possible to inform at what stage the remaining capacity of the battery is.

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

According to the sixth aspect of the present invention, it is possible to prevent a vehicle malfunction, for example, a damage caused by a large current flowing through the wire harness.

According to the seventh 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; battery management means) 6 Power interruption latch relay (first interruption means) 7 Power interruption latch relay (second interruption means) 9 Current sensor (current detection 19) Display section (part of warning means) 20 Alarm section (part of warning means) 30 First load group 60 Second load group 90 System-related input section 100 that does not want to shut down power System related output section that you do not want

Continued front page    (72) Inventor Koichi Shiramizu             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. (72) Inventor Masao Shibata             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F-term (reference) 5G003 BA01 DA02 DA14                 5H030 AS08 BB21 BB27 FF41 FF44

Claims (7)

[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, wherein an input section and an output section related to a system which requires constant power supply are connected, Battery management means that is supplied with power from a battery, vehicle stop detection means that detects a stop of the vehicle, and shutoff means that shuts off power supply to all loads other than the battery management means among the plurality of loads. The vehicle power supply system, wherein the battery management means drives the cutoff means when the vehicle stop is detected by the vehicle stop detecting means. 2. 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, a warning means, and A first load including loads other than the traveling system among the plurality of loads;
A first cutoff means for cutting off the power supply to the load group, and a second cutoff means for cutting off the power supply to the second load group, which includes the load of the traveling system among the plurality of loads. The vehicle management device further includes a vehicle stop detection unit that detects a stop of the vehicle, and a battery management unit that is connected to a system-related input unit and an output unit that require constant power supply and that is constantly supplied with power from the battery. Outputs a warning to the warning means when the remaining capacity of the battery 1 becomes less than or equal to a predetermined first reference value, and the remaining capacity of the battery 1 is lower than the first reference value or less in advance. When the value becomes less than or equal to the determined second reference value, the first cutoff means is driven, and the remaining capacity is lower than the second reference value or less. A power supply system for a vehicle, characterized in that when the vehicle stop detection means detects a vehicle stop, the first and second shutoff means are driven. 3. The battery according to claim 1, further comprising a left-days calculation means for calculating the left-days of the battery, wherein the warning means displays the left-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 2, wherein 4. The power supply system for a vehicle according to claim 2, wherein the warning means notifies the interruption state by the first or second interruption means by a warning having a different form from the warning. 5. 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 Alternatively, the vehicle power supply system according to any one of claims 2 to 4, wherein the remaining capacity of the battery is calculated based on a voltage detection signal from the voltage detection means. 6. The battery management means includes a current detection means for detecting a current flowing through the battery 1, and the battery management means, when the current detection signal from the current detection means is larger than a predetermined first reference value. Driving the first breaking means, driving the first and second 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 and is predetermined. The vehicle power supply system according to any one of claims 2 to 4, wherein: 7. 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. 7. The vehicle power supply system according to claim 6, wherein the state is notified by a warning having a different form from the warning.