JP2000227997A - Power supply system and vehicle management system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of making accurate navigation operation immediately start at the time of restarting power supply even when power supply from an accessory power source to a navigation device is stopped in order to save the power consumption. SOLUTION: The system is provided with a power supply voltage detection means 26 for detecting the output voltage of a power source such as a battery for a vehicle and constituted so as to stop power supply from an accessory power source 10 to a navigation device based on an output value from the means 26 and supply power from a backup power source 11 to a CPU 22, a GPS(global positioning system) receiving means 6, etc., necessary for calculating and backing up the position of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply system and a vehicle management system, and more particularly, to a power supply system for an emergency vehicle such as an ambulance or a fire engine equipped with a navigation device, and the power supply system. To a vehicle management system.

[0002]

2. Description of the Related Art In recent years, an emergency vehicle has been equipped with a navigation device so that it can immediately reach a disaster site or an accident site.

FIG. 8 is a block diagram schematically showing a main part of a conventional navigation device. 1 in the figure is ECU
(Electronic Control Unit).
Is configured to include a CPU 2, a RAM 3, a ROM 4, a backup memory 5, and the like.

A GPS (Global Positioning System)
m) GPS receiving means 6 which includes an antenna and a GPS receiver and can calculate the absolute position of the vehicle
A gyro sensor 7 capable of calculating the traveling direction of the vehicle, and a CD-ROM capable of taking in electronic map data from a CD-ROM in which electronic map data is stored.
The driver 8 is connected to the ECU 1, and the ECU 1 matches the acquired absolute position or traveling direction with the electronic map data (performs a so-called map matching process) to display a map on which the vehicle position is accurately shown on the display 9. To be displayed.

[0005] An emergency vehicle consumes a large amount of power during a fire fighting or rescue operation, and places a heavy load on a power source such as a battery of the vehicle. For this reason, a system has been introduced that automatically shuts off power supply from a device with a lower priority as the output voltage of a power source such as a battery decreases. This saves power consumption, protects a power supply such as a battery, and ensures that high-priority devices can be operated. In particular, since an ambulance is equipped with a number of electrical devices such as a device for taking an electrocardiogram, a refrigerator, and a medicine storage, the power load is extremely high.

FIG. 9 shows a power supply line of the navigation device shown in FIG. In the figure, reference numeral 10 denotes an accessory power supply. The accessory power supply 10 is connected to the CPU 2, the RAM 3, the ROM 4,
It is connected to the S receiving unit 6, the gyro sensor 7, the CD-ROM driver 8, and the display 9, so that power is supplied to each unit. Note that the accessory power supply 10 is supplied with power only when the vehicle engine is running.

The accessory power supply 10 is provided with a switch 15
Is connected to the first electrical equipment group 17 via the
Are connected to the electrical equipment group 18, and power is supplied to each unit.

An ECU for storing the absolute position, the traveling direction, and the like obtained from the GPS receiving means 6 and the gyro sensor 7
The backup memory 5 in 1 is connected to a backup power supply 11 such as a battery power supply or a battery of the vehicle so that such information can be stored even after the engine of the vehicle is stopped.

A power supply voltage detecting means 12 for detecting an output voltage of a power supply such as a battery of a vehicle includes a power supply section selecting means 13.
It is connected to the. When the output voltage from the power supply voltage detecting means 12 falls below a certain level, the power supply selecting means 13 turns off the switch 14 to stop the power supply to the navigation device. 15 is turned off, and the power supply to the first electronic device group 16 is stopped.
In this way, power can always be supplied to the second electronic device group (medical device etc.) 17 having the highest priority.

[0010]

As described above, since the power supply is stopped from the device having the lower priority, the power supply to the navigation device which is not directly related to human life is immediately cut off.

[0011] The entire navigation device is OFF (however,
When backup memory 5 is excluded),
Since no power is supplied to the CPU 2, the RAM 3, the ROM 4, the GPS receiving means 6, and the gyro sensor 7, the absolute position and the traveling direction of the vehicle are not calculated even if the vehicle moves,
Also, the absolute position and traveling direction of the vehicle backed up in the backup memory 5 are not updated.

Also, from the above state, the CPU 2, the RAM 3,
Resuming the supply of power to the ROM 4, the GPS receiver 6, and the gyro sensor 7 does not mean that an accurate absolute position or traveling direction of the vehicle can be obtained immediately. In some cases.

[0013] The absolute position and traveling direction data of the vehicle immediately before the power to the navigation device is cut off (ie, the position information of the vehicle stored in the backup memory), and the vehicle moves even after the power to the navigation device is cut off. This is because there is a great difference from the actual vehicle position. It may take 10 minutes or more for an accurate vehicle position to be calculated from such a state.

In an emergency vehicle or the like, since the base station uses a communication line to acquire position information of the vehicle at predetermined intervals and manages dynamics, the position information of the vehicle with low accuracy is acquired. In such cases, management activities may be greatly hindered. This is mainly due to the fact that the base station cannot detect that the positional information accuracy from the vehicle has decreased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and even if power supply from an accessory power supply to a navigation device is stopped in order to save power consumption, accurate navigation is immediately performed when power supply is resumed. It is an object of the present invention to provide a power supply system capable of starting operation, and a vehicle management system capable of detecting, on the base station side, when positional information accuracy from a vehicle is reduced.

[0016]

Means for Solving the Problems and Their Effects To achieve the above object, a power supply system (1) according to the present invention.
A vehicle equipped with a navigation device, a power supply voltage detecting means for detecting an output voltage of a power supply such as a battery of the vehicle, and an accessory power supply for the navigation device based on an output value from the power supply voltage detecting means. And a first power supply control unit for controlling a part of the navigation device to supply power from a battery power source or a backup power source of the vehicle. I have.

Further, in the power supply system (2) according to the present invention, in the power supply system (1), a part of the navigation device is a part necessary for calculating and backing up the position of the own vehicle. It is characterized by.

According to the above power supply system (1) or (2), when the battery voltage drops, the power supply from the accessory power supply to the navigation device is stopped to save power consumption (hereinafter, referred to as the following). (A state in which the power supply from the accessory power supply to the navigation device is stopped is also referred to as a power saving state.) Even if the battery voltage is reduced, it is necessary to continue supplying power to high-priority electrical devices. Can be.

Further, power is supplied to a part of the navigation device, which is necessary for calculating and backing up the position of the vehicle, such as a GPS antenna, a GPS receiver, a gyro sensor, and a CPU. By continuing, the actual vehicle position can be updated in the backup memory. Therefore, when power supply to the entire navigation device is restarted, an accurate navigation operation can be started immediately.

Further, in the power supply system (3) according to the present invention, in the power supply system (1) or (2), the power supply from the accessory power supply to the navigation device is stopped, and one of the navigation devices is stopped. When the power from the battery power supply or the backup power supply of the vehicle is supplied to the unit, the power supply from the accessory power supply to the navigation device is restored based on the output value from the power supply voltage detection unit. Along with
A second power supply control means for controlling a power supply from a battery power supply or a backup power supply of the vehicle to a part of the navigation device to be stopped is provided.

According to the power supply system (3), when the battery voltage is recovered, the power supply from the accessory power supply to the navigation device is restored, and the navigation operation can be promptly resumed.

Further, in the power supply system (4) according to the present invention, in any one of the power supply systems (1) to (3), power supply to the map data storage means for storing map data is stopped. When power from the battery power supply or backup power supply of the vehicle is supplied to the map data reading means for reading the map data, the map data reading means is prohibited from reading the map data from the map data storage means. The first prohibiting means is provided.

Even if the map data reading means (CPU 22 (see FIG. 1)) attempts to read the map data from the map data storage means (CD-ROM driver 8 (see FIG. 1)), If the power supply to is stopped, the map data cannot be read out, which is wasteful.

Therefore, in the power supply system (4), when the power supply to the map data storage is stopped, reading of the map data from the map data storage is prohibited. The above problem has been solved. Further, it is possible to prevent malfunctions caused by remaining access requests to the map data storage means.

Further, in the power supply system (5) according to the present invention, when the power supply from the accessory power supply to the navigation device is restored in the power supply system (4), the first prohibiting means is provided. And a first canceling means for canceling the prohibition due to.

According to the power supply system (5), when the power supply from the accessory power supply to the navigation device is restored, the state is automatically returned to the state before the transition to the power saving state, that is, the normal state. be able to.

Further, in the power supply system (6) according to the present invention, in any one of the power supply systems (1) to (5), power supply to the map data storage means for storing map data is stopped. A second prohibiting means for prohibiting the map matching processing means from performing the map matching processing when the power from the battery power supply or the backup power supply of the vehicle is supplied to the map matching processing means for performing the map matching processing; It is characterized by having.

When the power supply to the map data storage means (CD-ROM driver 8 (see FIG. 1) is stopped), new map data corresponding to the actual vehicle position is stored in the CPU 22 (see FIG. 1). ) Can not be read, so the map matching process in such a state,
The processing is performed using the map data read immediately before shifting to the power saving state, and the positional information accuracy is rather reduced.

Therefore, in the power supply system (6), the power supply to the map data storage is stopped.
When the map matching processing means (CPU 22) is supplied with electric power from a battery power supply or a backup power supply of the vehicle, the map matching processing means is prohibited from performing the map matching processing, thereby causing the above problem. Has been resolved.

Further, in the power supply system (7) according to the present invention, when the power supply from the accessory power supply to the navigation device is restored in the power supply system (6), the second prohibiting means is provided. And a second canceling means for canceling the prohibition due to.

According to the power supply system (7), when the power supply from the accessory power supply to the navigation apparatus is restored, the state is automatically returned to the state before the transition to the power saving state, that is, the normal state. be able to.

Further, in the power supply system (8) according to the present invention, in any one of the power supply systems (1) to (7), power supply from the accessory power supply to the navigation device is stopped, and When the power supply from the accessory power supply to the navigation device is restored from the state in which the power supply from the vehicle battery power supply or the backup power supply is supplied to the gyro sensor for obtaining the traveling direction, the gyro sensor It is characterized by comprising an initializing means for initializing a learning value.

The gyro sensor has a gyro sensor that learns the driving habit and the road surface condition every time the vehicle travels repeatedly, thereby improving the accuracy. There is a problem that it becomes impossible to acquire the traveling direction of the vehicle.
Therefore, in the power supply system (8), when returning from the power saving state, the above problem is solved by initializing the learning value.

Further, the power supply system (9) according to the present invention is configured such that, in any one of the power supply systems (1) to (8), when power supply from the accessory power supply to the navigation device is restored. It is characterized by providing notification means for notifying the user of the mode of the navigation operation at that time.

After the power supply from the accessory power supply to the navigation device is restored, the navigation operation starts. However, there is a case where the vehicle position cannot be accurately displayed on the display for a short time immediately after the start. This is because it takes some time to calculate an accurate vehicle position by the map matching process.

According to the power supply system (9), when the power supply from the accessory power supply to the navigation device is restored, the current situation is immediately after the restoration, and the erroneous display on the display is caused by the erroneous display. By notifying and recognizing the user that it is immediately after returning, the confusion of the user can be prevented.

The power supply system (1) according to the present invention
0) In any one of the power supply systems (1) to (9), the vehicle is provided with a wireless unit, and a signal indicating a power supply state to the navigation device is transmitted to the base station via the wireless unit. Transmission control means for transmitting data to

Since the base station for the vehicle has no means for detecting the transition to the power saving state, the position information of the vehicle transmitted from the vehicle in the power saving state is the same as that in the normal state. And may cause confusion at the base station.

According to the power supply system (10),
By transmitting a signal indicating the power supply state to the base station, the base station can detect whether or not the vehicle has shifted to a power saving state.

The vehicle management system (1) according to the present invention is the vehicle management system having the power supply system (10), wherein the power supply state of the vehicle is controlled based on the received signal. A display control means for displaying the information on the display means of the base station is provided.

According to the vehicle management system (1),
The transition of the vehicle to the power saving state at the base station can be easily and accurately detected.

Further, according to the vehicle management system (2) according to the present invention, in the vehicle management system having the power supply system (10), the power supply to the entire navigation device is not performed. A first access interval control means for extending an access interval for acquiring position information of the vehicle is provided.

In the power saving state, the positional information accuracy is lower than that in the normal state. Therefore, even if the base station frequently obtains the information, it is not so effective, but rather increases the traffic of the radio line. Only.

In the mobile radio vehicle management system (2), the above problem is solved by widening the interval of acquiring the position information in the power saving state.

The vehicle management system (3) according to the present invention, in the vehicle management system (2), displays the power supply state of the vehicle based on the received signal in the display means of the base station. Is provided with a display control means for causing the display to be displayed.

According to the vehicle management system (3),
The transition of the vehicle to the power saving state at the base station can be easily and accurately detected.

The power supply system (1) according to the present invention
1) The vehicle is provided with a navigation device, a vehicle dynamics setting means for a user to input dynamic information of the vehicle, and a wireless means for communicating with the base station for the vehicle, wherein the vehicle dynamics setting is performed. When the dynamic information from the means indicates that the vehicle is stopped, the power supply from the accessory power supply to the navigation device is stopped, and a part of the navigation device is supplied from the battery power source or the backup power source of the vehicle. A third power supply control means for controlling power supply is provided.

When the vehicle is stopped, the navigation device is not required so much. By stopping the power supply to the navigation device,
Power consumption can be saved.

According to the power supply system (11),
When the dynamic information indicates that the vehicle is stopped (for example, arrival at the site), power supply from the accessory power supply to the navigation device is stopped, and power consumption can be reduced.

Further, a part of the navigation device, which is necessary for calculating and backing up the position information of the vehicle, such as a GPS antenna, a GPS receiver, a gyro sensor, and a CPU, is continuously supplied with electric power. Thus, when the power supply to the entire navigation device is restarted, the navigation operation can be started immediately.

The power supply system (1) according to the present invention
2) The vehicle is equipped with a navigation device, a vehicle dynamics setting means for a user to input dynamic information of the vehicle, and a wireless means for communicating with a base station for the vehicle. The backup memory is supplied with electric power from the battery power supply or the backup power supply of the vehicle, and when the movement information from the vehicle movement setting means indicates that the vehicle is stopped, the power from the accessory power supply to the entire navigation device. A fourth power supply control means for stopping the supply is provided.

When the vehicle is stopped, the navigation device is not required so much. By stopping the power supply to the navigation device,
Power consumption can be saved.

According to the power supply system (12),
When the dynamic information indicates that the vehicle is stopped, power supply from the accessory power supply to the navigation device is stopped, and power consumption can be reduced.

Further, by storing the last position information of the vehicle at the time of stopping in the backup memory, the navigation operation can be started immediately if the power supply to the entire navigation device is resumed. it can.

Further, the vehicle management system (4) according to the present invention includes the power supply system (11) or (12).
A second access interval control means for extending an access interval for acquiring position information of the vehicle while power is not supplied to the entire navigation device. It is characterized by.

Since the position information of the vehicle does not change while power is not supplied to the entire navigation apparatus, it does not make much sense if the base station frequently obtains the information, but rather the traffic on the radio line. Only cause an increase. Therefore, the vehicle management system (4) solves the above-described problem by extending the interval of acquiring the position information of the vehicle in the power saving state.

The power supply system (1) according to the present invention
3) a selection setting unit that allows a user to selectively set whether to activate these control functions in any of the power supply systems (1) to (12); Operation control means for controlling the operation of these control functions according to the setting.

According to the power supply system (13),
Since the applicable range of the function can be determined according to the requirements of the user, the usability is good.

Further, in the vehicle management system (5) according to the present invention, in any one of the vehicle management systems (1) to (4), the user selectively sets whether or not to activate these control functions. And an operation control means for controlling the operation of these control functions in accordance with the setting from the selection setting means.

According to the vehicle management system (5),
Since the applicable range of the function can be determined according to the requirements of the user, the usability is good.

[0061]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a power supply system and a vehicle management system according to the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram schematically showing a main part of a power supply system according to the embodiment (1). In the figure, reference numeral 21 denotes an ECU.
It is configured to include a RAM 3, a ROM 4, a backup memory 5, and the like.

A G including a GPS antenna and a GPS receiver can calculate the absolute position of the vehicle.
The ECU 21 is connected to a PS receiving means 6, a gyro sensor 7 capable of calculating the traveling direction of the vehicle, and a CD-ROM driver 8 capable of taking in electronic map data from a CD-ROM in which electronic map data is stored. The ECU 21 performs a map matching process on the basis of the acquired absolute position and traveling direction and the electronic map data, so that a map on which the vehicle position is accurately shown is displayed on the display 9.

The CPU 22, the RAM 3, and the ROM 4 are supplied with power from the accessory power supply 10 or the backup power supply 11 by the changeover switch 23, and the GPS receiving means 6 and the gyro sensor 7 are supplied from the accessory power supply 10 or the backup power supply 11 by the changeover switch 24. Electric power is supplied. Also, a distance sensor (not shown) may be supplied with power from the accessory power supply 10 or the backup power supply 11. The accessory power supply 10 is connected to the CD-ROM driver 8 and the display 9 via a switch 25 so that power is supplied to each unit.

An ECU for storing the absolute position, traveling direction and the like obtained from the GPS receiving means 6 and the gyro sensor 7
The backup memory 5 in the storage 21 is connected to a backup power supply 11 such as a battery power supply or a battery of the vehicle so that such information can be stored even after the engine of the vehicle is stopped.

A power supply voltage detecting means 26 for detecting an output voltage of a power supply such as a battery of the vehicle is connected to the ECU 21.
When the output voltage from the switch falls below a certain level, the switch 2
5 is turned off, and the changeover switches 23 and 24
The control signal is output to the changeover switches 23 and 24 and the switch 25 such that the control signal is on the backup power supply 11 side.

The operation of the CPU 22 in the power supply system according to the embodiment (1) will be described with reference to the flowchart shown in FIG. First, the power supply voltage detecting means 2
6, the output voltage V of the battery voltage is fetched (S1),
Next, a flag f ₁ for indicating whether or not the power supply from the accessory power supply 10 to the navigation device is stopped.
It is determined whether (if stopped: flag f ₁ = 1) is 0 (S2).

If it is determined that the flag f ₁ is 0, that is, if the power supply from the accessory power supply 10 to the navigation device is continued, it is determined whether the output voltage V is equal to or lower than the predetermined voltage V ₁ . Is determined (S3), and the output voltage V
If it is determined but that the predetermined voltages V ₁ or less, CD-ROM
The flag f ₂ is used to prohibit access and map matching processing to the driver 8 to 1 (S4).

Next, a control signal is output to the switch 25 so that the switch 25 is turned off (S5).
As 22 or GPS receiver 6 or the like is connected to the backup power supply 11 outputs a control signal to the selector switch 23, 24 (S6), a to 1 flag f ₁ (S7). In this way, power is continuously supplied to a portion necessary for calculating and backing up the own vehicle position.

[0070] On the other hand, in S2, if the flag f ₁ is not 0 judgment, that is, when the power is to the entire navigation device not supplied, the output voltage V is whether a predetermined voltage V ₂ or more Judgment (S8), the output voltage V
If it is determined but that the predetermined voltage V ₂ or more, as such CPU22 and GPS receiving unit 6 is connected to the accessory power supply 10 outputs a control signal to the selector switch 23, 24 (S9), the switch 25 is ON A control signal is output to the switch 25 (S10) so that the flags f ₁ and f ₂
Is set to 0 (S11). In this way, the power supply to the entire navigation device is restarted, and in S12, the fact that the power supply to the entire navigation device is restarted is displayed on the display 9.

According to the power supply system according to the embodiment (1), when the battery voltage drops, the power supply from the accessory power supply 10 to the navigation device is stopped to save power consumption, thereby saving power. By setting the power state, even if the battery voltage decreases, it is possible to continue supplying power to the high-priority electrical devices.

Further, a part necessary for calculating and backing up the own vehicle position of the vehicle, the CPU 22, the RAM 3, the RO
Since power can be continuously supplied to the M4, the backup memory 5, the GPS receiving means 6, and the gyro sensor 7, the actual vehicle position can be updated in the backup memory 5. Therefore, when the battery voltage recovers and the power supply to the entire navigation device is restarted, the accurate navigation operation can be started immediately.

Next, the operation of the CPU 22 when reading map data from the CD-ROM driver 8 will be described. First, to obtain the value of the flag f _2, the flag f ₂ is 1
Determining whether a, if the flag f ₂ is 1, that is, when the power supply to the CD-ROM driver 8 is stopped, prevents access to the CD-ROM driver 8 (Corresponding to the first prohibition means). This can prevent a malfunction that may be caused by a remaining access request to the CD-ROM driver.

Next, the operation of the CPU 22 when performing the map matching processing will be described. First, the flag f
₂ to determine whether the flag f ₂ is 1 or not. If the flag f ₂ is 1, ie, the CD-R
When the power supply to the OM driver 8 is stopped,
The map matching process is prohibited (second prohibition means). As a result, when power supply to the CD-ROM driver 8 is stopped, it is possible to prevent a decrease in position information accuracy due to a failure to read out new map data corresponding to an actual vehicle position.

In a normal case, a map matching process is performed to link the absolute position obtained by the GPS receiving means 6 and the traveling direction obtained by the gyro sensor 7 with map data in the CD-ROM. Therefore, the position of the vehicle is corrected so that it can be accurately displayed on the electronic map even on fine roads and complicated roads, but since the map matching process is not performed in the power saving state, it corresponds to the map Has not been able to obtain the exact location of the vehicle.

Therefore, even if the vehicle returns from the power saving state, it is not possible to inform the user of the exact position of the vehicle immediately after the return. Therefore, for example, a strange display such as a display indicating that the vehicle is traveling in a building may be made, and the behavior immediately after returning to the normal operation may not be understood by the user.

Therefore, it is possible to prevent the user from being confused by displaying on the display 9 that the erroneous display on the display 9 is due to the effect immediately after the return of the power supply, or notifying the user by voice from a speaker or the like. it can.

The gyro sensor 7 learns driving habits and road surface conditions every time the vehicle travels repeatedly, thereby improving the accuracy. However, the gyro sensor 7 cannot learn correctly in the power saving state. The problem that the accurate traveling direction of the vehicle may not be obtained can be solved by initializing the learning value after S20 shown in FIG.

FIG. 3 is a block diagram schematically showing a main part of a power supply system according to the embodiment (2). Here, the same components as those of the power supply system shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 27 denotes an ECU.
Reference numeral 7 includes a CPU 28, a RAM 3, a ROM 4, a backup memory 5, and the like. The GPS receiving means 6, the gyro sensor 7, and the CD-ROM driver 8 are connected to the ECU 27. The ECU 27 performs a map matching process based on the acquired absolute position and traveling direction and the electronic map, so that the vehicle position can be determined. An accurately displayed map is displayed on the display 9.

The CPU 28, the RAM 3, and the ROM 4 are supplied with power from the accessory power supply 10 or the backup power supply 11 by the changeover switch 23, and the GPS receiving means 6 and the gyro sensor 7 are supplied from the accessory power supply 10 or the backup power supply 11 by the changeover switch 24. Electric power is supplied.

The accessory power supply 10 is connected to a switch 25.
Via the CD-ROM driver 8 and the display 9 so that power is supplied to each unit.

An ECU for storing the absolute position, the traveling direction and the like obtained from the GPS receiving means 6 and the gyro sensor 7
The backup memory 5 in 27 is connected to a backup power supply 11 such as a battery power supply or a battery of the vehicle so that such information can be stored even after the engine of the vehicle is stopped.

Vehicle dynamics setting means 29 for the user to input vehicle dynamics information, for example, dispatch, arrival (arrival at the site), present (departure from the site), and return, is connected to the ECU 27. The CPU 28 in the ECU 27 turns off the switch 25 when the dynamic information from the vehicle dynamic setting means 29 indicates that the vehicle is stopped (current arrival / return).
The changeover switches 23, 24 and the switch 25 are set so that the changeover switches 23, 24 are on the backup power supply 11 side.
The control signal is output to the

The operation of the CPU 28 in the power supply system according to the embodiment (2) will be described with reference to the flowchart shown in FIG. First, vehicle dynamics setting means 2
The vehicle dynamics information is fetched from the vehicle 9 (S31), and then a flag f ₁ for indicating whether or not the power supply from the accessory power supply 10 to the navigation device has been stopped (if stopped, the flag f ₁ = It is determined whether 1) is 0 (S32).

If it is determined that the flag f ₁ is 0, that is, if the power supply from the accessory power supply 10 to the navigation device is continued, the dynamic information indicates the arrival or return (ie, the stopped state). It is determined whether or not there is (S3
3) If it is determined that the vehicle is in a stopped state, the CD-RO
The flag f ₂ is used to prohibit access and map matching processing to the M driver 8 to 1 (S34).

Next, a control signal is output to the switch 25 so that the switch 25 is turned off (S35).
As U28 and GPS receiving unit 6 and the like are connected to the backup power supply 11 outputs a control signal to the selector switch 23, 24 (S36), a to 1 flag f ₁ (S3
7). In this way, power is continuously supplied to a portion necessary for calculating and backing up the own vehicle position.

[0088] On the other hand, in S32, if the flag f ₁ is not 0 determined, i.e. whether the to entire navigation device when no power is supplied is dynamic information dispatch or current starting (i.e. during traveling) Is determined (S
38) If it is determined that the vehicle is running, the CPU 28
A control signal is output to the changeover switches 23 and 24 so that the GPS receiver 6 and the GPS receiver 6 are connected to the accessory power supply 10 (S39), and a control signal is output to the switch 25 so that the switch 25 is turned on (S39). S40), flags f ₁ and f
_{2 is set} to 0 (S41). In this way, the power supply to the entire navigation device is restarted, and in S42, the fact that the power supply to the entire navigation device is restarted is displayed on the display 9.

According to the power supply system of the above embodiment (2), when the vehicle is in a stopped state, the power supply is continued only to the parts necessary for calculating and backing up the position information of the vehicle. In this way, the power consumption is reduced and the power saving state is set, so that even when the battery voltage decreases, power can be continuously supplied to the high-priority electrical devices.

FIG. 5 is a block diagram schematically showing a main part of the vehicle management system according to the embodiment (3) of the present invention. In the figure, reference numeral 31 denotes a vehicle, and the vehicle 31 includes a control unit 32 corresponding to the ECU 21 shown in FIG. 1 and a wireless device 33. A base station 34 for the vehicle 31 includes a wireless device 35, a control unit. 36 and a display 37. Note that the vehicle 31 here is a vehicle having the power supply system according to Embodiment (1).

The operation of the control unit 32 in the vehicle management system according to the embodiment (3) will be described with reference to the flowchart shown in FIG. First, it is determined whether or not there is an access from the base station 34 to acquire the position information of the vehicle (S51). If it is determined that there is an access, the flag f ₁ is determined whether or not 1 (S5
2) if the flag f ₁ is 1, that is, if the power saving state, then the flag f ₃ is determined whether or not 0 (S53).

The flag f ₃ is a flag indicating whether or not a signal indicating a power supply state to the navigation device, that is, a signal indicating whether the state has shifted to the power saving state or has returned to the normal state, has been transmitted to the base station 34. And the flag f ₃
= 1 indicates that the signal indicating the transition to the power saving state has been transmitted, and the flag f ₃ = 0 indicates that the signal indicating the return to the normal state has been transmitted.

If the flag f ₃ is 0, control is performed such that a signal indicating that the power is in a power saving state is transmitted to the base station 34 via the radio device 33 (S 54), and the flag f _{3 is set} to 1 ( S55).

[0094] On the other hand, in S52, unless the flag f ₁ is 1, that is, if the normal state, then the flag f ₃
Is determined to be 1 (S56). If the flag f ₃ is 1, a signal indicating that it has returned to the base station 34 to the normal state control to transmit via the radio 33 (S
57), the flag f ₃ to 0.

Next, the operation of the control unit 36 in the vehicle management system according to the embodiment (3) will be described with reference to the flowchart shown in FIG. First, the vehicle 31
It is determined whether there is a signal indicating the power supply state in the information from (S61). If the signal exists, it is determined whether the signal is a signal indicating transition to the power saving state (S6).
2) If it is a signal indicating a power saving state transition, control is performed to display on the display 37 that the vehicle 31 is in the power saving state (S63), and communication access for acquiring position information of the vehicle 31 is performed. Is made wider than usual (S64).

On the other hand, if it is determined in step S62 that the signal does not indicate the transition to the power saving state, that is, if the signal indicates the return to the normal state, the communication access interval for acquiring the position information of the vehicle 31 is changed to the normal state. Return (S65).

According to the vehicle management system of the above embodiment (3), it is possible to easily and accurately detect that vehicle 31 has shifted to the power saving state at base station 34. In addition, since the accuracy of the position information is lower in the power saving state than in the normal state, even if the information is frequently acquired by the base station 34, it is not so effective, but rather increases the traffic of the wireless line. However, in the power saving state, the above problem is solved by widening the interval of acquiring the position information.

The power supply system according to the above embodiment,
Alternatively, in the vehicle management system according to the above-described embodiment, a selection setting unit that allows a user to selectively set whether to activate these control functions, and the control unit performs these control operations in accordance with the setting from the selection setting unit. With the provision of the operation control means for controlling the operation of the function, it is possible to configure a system according to the requirements of the user.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a main part of a power supply system according to Embodiment (1) of the present invention.

FIG. 2 is a flowchart showing an operation of a CPU in the power supply system according to Embodiment (1).

FIG. 3 is a block diagram schematically showing a main part of a power supply system according to Embodiment (2).

FIG. 4 is a flowchart showing an operation of a CPU in the power supply system according to Embodiment (2).

FIG. 5 is a block diagram schematically showing a main part of a vehicle management system according to Embodiment (3) of the present invention.

FIG. 6 is a flowchart showing an operation of a vehicle-side control unit in the vehicle management system according to the embodiment (3).

FIG. 7 is a flowchart showing an operation of a base station-side control unit in the vehicle management system according to Embodiment (3).

FIG. 8 is a block diagram schematically showing a main part of a conventional navigation device.

9 shows a power supply line in the navigation device shown in FIG.

[Explanation of symbols]

 1, 21, 27 ECU 2, 22, 28 CPU 5 Backup memory 6 GPS receiving means 7 Gyro sensor 8 CD-ROM driver 9 Display 10 Accessory power supply 11 Backup power supply 12, 26 Power supply voltage detecting means 14, 15, 25 Switch 23, 24 changeover switch 29 vehicle dynamics setting means 31 vehicle 32, 36 control unit 33, 35 radio 34 base station

Claims (18)

[Claims] 1. A vehicle is equipped with a navigation device,
Power supply voltage detecting means for detecting an output voltage of a power supply such as a battery of the vehicle; and stopping power supply from an accessory power supply to the navigation device based on an output value from the power supply voltage detecting means, A power supply system, comprising: first power supply control means for controlling a part of the device to supply power from a battery power supply or a backup power supply of the vehicle. 2. The power supply system according to claim 1, wherein a part of the navigation device is a part necessary for calculating and backing up a position of the own vehicle. 3. When the power supply from an accessory power supply to the navigation device is stopped, and a part of the navigation device is supplied with power from a battery power supply or a backup power supply of the vehicle, the power supply is provided. The power supply from the accessory power supply to the navigation device is restored based on the output value from the voltage detection means, and the power supply from the vehicle battery power supply or the backup power supply to a part of the navigation device is stopped. 3. The power supply system according to claim 1, further comprising a second power supply control unit that controls the power supply. 4. When the power supply to the map data storing means for storing the map data is stopped and the power from the battery power supply or the backup power supply of the vehicle is supplied to the map data reading means for reading the map data. The apparatus according to any one of claims 1 to 3, further comprising a first prohibition unit that prohibits the map data reading unit from reading the map data from the map data storage unit. Power supply system. 5. The apparatus according to claim 1, further comprising a first release unit that releases the prohibition by the first prohibition unit when the power supply from the accessory power supply to the navigation device is restored. 5. The power supply system according to 4. 6. When the power supply to the map data storage means for storing map data is stopped and power is supplied to the map matching processing means for performing map matching processing from a battery power supply or a backup power supply of the vehicle. The power supply system according to any one of claims 1 to 5, further comprising a second prohibition unit that prohibits the map matching processing unit from performing the map matching process. 7. The system according to claim 1, further comprising a second release unit that releases the prohibition by the second prohibition unit when the power supply from the accessory power supply to the navigation device is restored. 7. The power supply system according to 6. 8. A state in which power supply from an accessory power supply to the navigation device is stopped, and a gyro sensor for obtaining a traveling direction of the vehicle is supplied with power from a battery power supply or a backup power supply of the vehicle. 8. The apparatus according to claim 1, further comprising an initialization unit configured to initialize a learning value of the gyro sensor when power supply from an accessory power supply to the navigation device is restored. A power supply system according to claim 1. 9. A notifying means for notifying a user of a mode of a navigation operation at the time when power supply from an accessory power supply to the navigation device is restored, is provided. The power supply system according to any one of Items 1 to 8. 10. The vehicle is equipped with wireless means, and further comprises transmission control means for transmitting a signal indicating a state of power supply to the navigation device to a base station via the wireless means. The power supply system according to claim 1. 11. A vehicle control system having a power supply system according to claim 10, wherein a display control means for displaying the power supply state of the vehicle on a display means of the base station based on the received signal. A vehicle management system comprising: 12. The vehicle management system having the power supply system according to claim 10, wherein an access interval for acquiring position information of the vehicle is set while power is not supplied to the entire navigation device. A vehicle management system comprising: a first access interval control unit that extends. 13. The vehicle management system according to claim 12, further comprising display control means for displaying the power supply state of the vehicle on a display means of the base station based on the received signal. system. 14. A vehicle comprising a navigation device, a vehicle dynamics setting means for a user to input dynamic information of the vehicle, and a wireless means for communicating with a base station for the vehicle. When the dynamic information from the setting means indicates that the vehicle is stopped, the power supply from the accessory power supply to the navigation device is stopped, and a part of the navigation device is supplied from the battery power supply or the backup power supply of the vehicle. Power supply system comprising a third power supply control unit that controls so as to supply the electric power. 15. A navigation system, comprising: a navigation device in a vehicle; a vehicle dynamics setting unit for a user to input dynamic information of the vehicle; and a wireless unit for communicating with a base station for the vehicle. Power is supplied from the battery power supply or the backup power supply of the vehicle to the backup memory. If the movement information from the vehicle movement setting means indicates that the vehicle is stopped, the power supply from the accessory power supply to the entire navigation device is provided. A power supply system comprising: fourth power supply control means for stopping power supply. 16. A vehicle management system having the power supply system according to claim 14, wherein position information of the vehicle is acquired while power is not supplied to the entire navigation device. A second access interval control means for increasing an access interval of the vehicle. 17. A selection setting means for allowing a user to selectively set whether or not to activate these control functions, and an operation control for controlling the operation of these control functions in accordance with the settings from the selection and setting means. The power supply system according to any one of claims 1 to 10, 14, and 15, further comprising: 18. A selection setting means for allowing a user to selectively set whether or not to activate these control functions, and an operation control for controlling the operation of these control functions in accordance with settings from the selection and setting means. The vehicle management system according to any one of claims 11 to 13, wherein the vehicle management system comprises means.