JP2004048353A - On-vehicle wireless system and power supply control unit for on-vehicle wireless system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-vehicle wireless system capable of normally performing data communication processing for an external device through a software wireless apparatus without causing abnormity in a nonvolatile storage section even when a voltage of power supplied to a communication control means is decreased during start processing or end processing wherein the communication control means accesses the nonvolatile storage section. <P>SOLUTION: A power supply switching circuit 14 of a power supply control unit 2 mounted on the on-vehicle wireless system 1 supplies power to an on-vehicle server 3 and a software wireless apparatus 4 from a main on-vehicle power supply 5. When a vehicle comes to a stop and an ignition switch is turned off, the on-vehicle server 3 accesses an HDD (nonvolatile storage section) 16 to apply shut-down processing thereto, and when the ignition switch is again turned on to start the vehicle while the processing is performed, the voltage of the power supplied from the main on-vehicle power supply 5 is decreased. In this case, the power supply switching circuit 14 selects an auxiliary on-vehicle power supply 6, which supplies power to the power supply control unit 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-vehicle wireless system including a software defined radio and a power supply control unit for an in-vehicle wireless system that controls a power supply of the in-vehicle wireless system.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, when a driver of a vehicle turns on an ignition switch, power is supplied from a lead storage battery (main power supply means) to a vehicle body, and an engine of the vehicle is started.
[0003]
By the way, in recent years, a plurality of types of wireless devices have been mounted on vehicles in order to support different communication systems. For this reason, it is necessary to purchase a new wireless device in order to support a new communication system, and there is a problem that a burden on a user is large. Therefore, as a means for solving such a problem, a software defined radio has been proposed. In this software defined radio, the communication operation is set by software, and one software defined radio can support various communication systems. In this software defined radio, software is written by, for example, an in-vehicle server functioning as communication control means. If the in-vehicle server has software, the software is written. It is considered to be downloaded and written.
[0004]
The in-vehicle wireless system built into the vehicle body starts the in-vehicle server when power is supplied, starts up in a state where it can communicate with the software defined radio, and is installed outside the vehicle via the software defined radio in the activated state. Data communication with external devices.
[0005]
Then, when the ignition switch is turned off, the in-vehicle server performs a termination process, and stops when the termination process is terminated. This termination process is performed to safely stop the process started on the vehicle-mounted server. For example, a mechanically accessible hard disk drive (hereinafter, referred to as HDD: nonvolatile storage unit), or A process (read / write process) for accessing various electrically accessible nonvolatile memories (nonvolatile storage unit) is performed. In this case, if the termination processing is performed normally, the in-vehicle wireless system is normally stopped, and can be normally started even if it is restarted. The next data communication performed with the outside through the software defined radio Processing can also be performed normally.
[0006]
[Problems to be solved by the invention]
However, if the vehicle is again started by the ignition switch during the termination processing of the on-vehicle server described above, for example, an increase in the power load applied to the drive system device (high-load device) that occurs when the vehicle starts starts. When the voltage decreases, the power supply voltage applied to the HDD or the nonvolatile memory mounted on the in-vehicle server decreases, and there is a possibility that the termination process cannot be executed reliably. In particular, when a member such as an HDD having a member for mechanically recording and reading data is provided, this member may be damaged and malfunction may occur thereafter.
[0007]
FIGS. 7A to 7E show an outline of this problem in a timing chart as an example. In FIG. 7, while the vehicle is running, the in-vehicle server operates and is in a state where it can communicate with the outside via the software defined radio. Thereafter, when the vehicle stops and the driver turns off the ignition switch, the in-vehicle server starts the end process. This end processing requires a time of about several seconds. During this end processing operation, the driver turns on the ignition switch of the vehicle again to start the engine again in order to run the vehicle again. During the starting time when the vehicle starts, the power consumption becomes enormous, and the supply voltage + B [V] drops from, for example, 12 V to 10 V or less.
[0008]
In this case, if the power supplied to the in-vehicle server is reduced and the HDD of the in-vehicle server is damaged or the contents stored in the non-volatile memory are destroyed, an abnormality occurs in the termination processing, and the communication processing to communicate with the next time radio device is performed. Sometimes, it may not work properly. In particular, in recent years, the above-mentioned in-vehicle wireless system has become capable of performing data wireless communication by packet communication or the like with a wireless communication device (external device) outside the vehicle, and it is necessary to solve the problem when the wireless communication device does not operate normally. Is emerging. Further, such a problem also occurs when the power supply voltage (power) decreases at the time of starting the in-vehicle server.
[0009]
The present invention has been made in view of the above circumstances, and even if power supply to the communication control unit is reduced during start-up processing or termination processing in which the communication control unit accesses the nonvolatile storage unit, the nonvolatile storage unit It is an object of the present invention to provide an in-vehicle wireless system and a power supply control unit for the in-vehicle wireless system capable of performing normal data communication processing with the outside via a software defined radio without causing any abnormality in the unit.
[0010]
[Means for Solving the Problems]
According to the first or fifth aspect of the present invention, the switching means supplies power to the communication control means from the higher power supply voltage of the main power supply means and the auxiliary power supply means. Even if the power supply to the communication control unit is reduced during the start-up process or the end process, no abnormality occurs in the non-volatile storage unit, and the data communication process with the outside via the software defined radio is performed. Can be performed normally.
At this time, the auxiliary power supply means may be constituted by a secondary battery or a primary battery having a smaller output capacity than the main power supply means, as in the invention according to any one of claims 2 and 6.
[0011]
According to the third aspect of the present invention, the switching unit is configured to control the supply voltage from the main power supply unit when the operation determination unit determines that the communication control unit is performing the start process or the end process. During the period during which the power supply decreases, the power is switched from the auxiliary power supply unit to the communication control unit, so that the power can be switched more reliably during the start-up process or the termination process of the communication control unit.
According to the invention as set forth in claim 4 or 8, since the power supply control means sequentially starts the plurality of high-load devices, the power load of the high-load devices is dispersed in particular, thereby preventing a sharp drop in the power supply voltage. can do.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1 showing the overall configuration of the vehicle-mounted wireless system 1, a power supply control unit (power supply control unit for a vehicle-mounted wireless system) for controlling the power supply of the whole vehicle-mounted wireless system 1, a vehicle-mounted server 3 as a communication control unit and a software defined radio 4 The power control unit 2 is connected to a main vehicle power supply (main power supply means) 5, an auxiliary vehicle power supply (auxiliary power supply means) 6, and a control line A from an ignition switch (not shown).
[0013]
The power control unit 2 mainly includes a control circuit 7 as power control means, and is configured to control the inside of the power control unit 2 based on a program stored in a connected memory 8. I have. The main in-vehicle power supply 5 is connected to the control circuit 7, and the power supply switching circuit 9 for servers, the power supply switching circuit 10 for peripheral devices, the communication I / F circuit 11, and the control line A are connected to the control circuit 7. ing.
[0014]
The main in-vehicle power supply 5 is composed of, for example, a 12 V or 24 V lead storage battery or a fuel cell. The power supply line of the main in-vehicle power supply 5 is connected to the power supply stabilizing circuit 12. The power supply line of the main vehicle-mounted power supply 5 is connected to an electric system mounted on the vehicle main body, and is also connected to a drive system device (not shown). The auxiliary vehicle-mounted power supply 6 is composed of, for example, a lead-acid battery having substantially the same output capacity (output characteristics) as the main vehicle-mounted power supply 5, and can supply a constant voltage substantially the same as the supply voltage of the main vehicle-mounted power supply 5. Has become. The power supply line of the auxiliary vehicle-mounted power supply 6 is connected to a power supply stabilization circuit 13 that is configured separately from the above-described power supply stabilization circuit 12. In the drawings, for the sake of simplicity, the main power supply lines for describing the invention are indicated by thick lines, and the control lines are indicated by thin lines.
[0015]
The power supply stabilization circuits 12 and 13 respectively stabilize the supplied power supply voltage and supply the power supply voltage to a power supply switching circuit 14 as switching means. The power supply switching circuit 14 is configured to supply power to the server power supply switching circuit 9 and the peripheral device power supply switching circuit 10 from one of the main vehicle power supply 5 and the auxiliary vehicle power supply 6. More specifically, the power supply switching circuit 14 includes a voltage detection circuit including a diode or the like, and supplies a voltage to be supplied to the server power supply switching circuit 9 and the peripheral device power supply switching circuit 10 to a voltage. The power is supplied to each of the switching circuits 9 and 10 by a power supply that is constantly detected by a detection circuit and detected at a higher voltage from the main vehicle-mounted power supply 5 and the auxiliary vehicle-mounted power supply 6. Although the switching circuits 9 and 10 are formed separately, they may be formed integrally.
[0016]
The communication I / F circuit 7 is connected to an in-vehicle server operation determination unit 15 functioning as an operation determination unit.
The server power supply switching circuit 9 turns on / off the output of the electric power supplied from the power supply switching circuit 14 to the vehicle-mounted server 3 based on a power supply command from the control circuit 7. The power switching circuit 10 for the peripheral device turns on and off the output to the software defined radio 4 based on a power supply command from the control circuit 7.
[0017]
The in-vehicle server 3 is mainly configured by the in-vehicle server control circuit 16 and functions as a gateway server for an in-vehicle LAN (not shown), and consumes about several tens of watts. The in-vehicle server control circuit 16 includes a hard disk drive (HDD) 16a as a nonvolatile storage unit, and is configured by connecting a power supply circuit 17, a startup detection circuit 18, and a communication I / F circuit 19. I have. The power supply circuit 17 receives power from the server power supply switching circuit 9 and supplies power to the onboard server control circuit 16 and the communication I / F circuit 19.
[0018]
The start-up detection circuit 18 has an auxiliary power supply (not shown) and operates even when power is not supplied to the power supply circuit 17. The start-up detection circuit 18 receives the start-up signal from the control circuit 7 of the power supply control unit 2. Based on this, the onboard server control circuit 16 of the onboard server 3 is started.
[0019]
The in-vehicle server control circuit 16 is connected to an in-vehicle LAN (not shown) through a communication I / F circuit 19, and performs protocol conversion of data (packets) between various ECUs constituting the in-vehicle LAN and the software defined radio 4 for transmission / reception. It has become. The software defined radio 4 is configured by a programmable logic device (PLD) or the like, and the circuit configuration can be arbitrarily set by, for example, control software for programmable logic stored in the in-vehicle server control circuit 16. This circuit configuration can be changed and set according to the processing load of the in-vehicle server 3 and the like. Note that the control program may be set in the program logic, or may be downloaded by the in-vehicle server 3.
[0020]
The software defined radio 4 is configured as an integrated radio having a DSRC (Dedicated Short Range Communication) in-vehicle device 4a, a packet communication device 4b, and a GPS receiver 4c configured by a PLD or the like. Are provided with power supply circuits 4aa to 4cc. The DSRC in-vehicle device 4a is configured to be able to perform data communication with a fixed wireless communication device installed on the road under the control of the in-vehicle server 3 when receiving power supply from the power supply circuit 4aa.
[0021]
Upon receiving power supply from the power supply circuit 4bb, the packet communication device 4b is configured to be able to perform packet communication with a wireless communication device outside the vehicle under the control of the on-vehicle server 3. When receiving power from the power supply circuit 4cc, the GPS receiver 4c demodulates GPS signal data transmitted from a GPS satellite (not shown), and outputs vehicle speed information from a vehicle speed sensor (not shown) mounted on the vehicle. At the same time, the current position of the vehicle is specified.
[0022]
Also, the software defined radio 4 is provided with a communication I / F circuit 4d, and the DSRC vehicle-mounted device 4a, the packet communication device 4b, and the GPS receiver 4c perform data communication with the vehicle-mounted server control circuit 16 described above. It is configured. Further, the software defined radio 4 has an antenna 4e, and is configured to be able to perform data communication with a radio communication device outside the vehicle through the antenna 4e. In short, the software defined radio 4 is configured as an integrated radio in which a plurality of radios whose communication methods can be changed are integrated.
[0023]
The operation of the above configuration will be described.
Here, as described in the section of the problem to be solved by the invention, the operation will be described for a state in which a problem is considered to occur. That is, when the vehicle equipped with the on-vehicle wireless system 1 runs and stops, and then the ignition switch of the vehicle is turned off, the in-vehicle server 3 starts the shutdown process as the termination process, and again in the middle of the shutdown process. The operation in the case where the ignition switch is turned on and the power supply is assumed to decrease will be described with reference to FIG.
[0024]
2, while the vehicle is running, the output of the server power supply switching circuit 9 is turned on based on a command from the control circuit 7, and a sufficient voltage (+ B voltage of FIG. 2B) is applied to the power supply circuit 17. ), The in-vehicle server 3 operates normally and can perform data communication with the wireless communication device outside the vehicle via the software defined wireless device 4 (see FIG. 2, (1)). When the vehicle stops running and the ignition switch is turned off, a stop signal is given to the control circuit 7 via the control line A, and the control circuit 7 instructs the vehicle server control circuit 16 to stop the vehicle server. A command is given (see FIG. 2, (2)). When the in-vehicle server stop command is given, the in-vehicle server control circuit 16 shifts the software defined radio 4 from the communication processing enabled state to the standby state. The standby state indicates a state in which the software defined radio 4 and the radio communication device outside the vehicle cannot communicate with each other.
[0025]
The control circuit 7 transmits a shutdown command (vehicle server stop command) to the vehicle server control circuit 16, and the vehicle server control circuit 16 starts a shutdown process. On the other hand, the control circuit 7 stops the power supply to the software defined radio 4 by turning off the output of the peripheral device power switching circuit 10. Then, when the ignition switch is operated again (OFF → ACC position) during the shutdown processing, a start signal is input to the control circuit 7 via the control line A (see FIG. 2, (3)). When the ignition switch is further operated and turned on (ACC → ON, START position), the vehicle starts (see FIG. 2, (4)). In this case, for example, the power supply from the main vehicle-mounted power supply 5 decreases due to an increase in the power load of the drive system device of the vehicle (not shown). When the voltage from the power supply drops below the supply voltage from the auxiliary vehicle-mounted power supply 6, the power supply switching circuit 14 switches to supply power from the auxiliary vehicle-mounted power supply 6 and supplies the power to the vehicle-mounted server 3. As a result, the power supply voltage + B supplied to the vehicle server 3 is substantially maintained.
[0026]
When the start of the engine of the vehicle is completed, the power load is reduced, and the supply voltage from the main vehicle-mounted power supply 5 is restored. In this case, switching is performed by the power supply switching circuit 14 so that power is supplied from the main vehicle-mounted power supply 5 to the vehicle-mounted server 3 (see FIG. 2, (5)).
[0027]
During the starting time when the vehicle starts, the in-vehicle server control circuit 16 can perform a process of normally accessing the HDD, perform a normal shutdown process, and shift to a stopped state (see FIG. 2, (6)). . Thereafter, upon detecting that the shutdown processing has been normally completed, the in-vehicle server operation determination unit 15 transmits a non-operation signal to the control circuit 7. When detecting the non-operation signal, the control circuit 7 detects the start / stop signal again, and when the start signal is detected (when the ignition switch is ON), transmits a start command to the start detection circuit 18 and re-executes the in-vehicle server. 3 is started (see FIG. 2, (7)). When the in-vehicle server 3 is instructed to be activated, the in-vehicle server 3 is normally activated, and data communication processing can be performed between the wireless communication device outside the vehicle and the software defined radio device 4.
[0028]
In this case, when the in-vehicle server operation determination unit 15 detects the non-operation signal and detects the start / stop signal again, and when the stop signal (ignition switch OFF) is detected, the control circuit 7 controls the server. The power supply switching circuit 9 is instructed to turn off the power supply to the in-vehicle server 3 to cut off the power supply (not shown).
[0029]
As a result, even when the in-vehicle server 3 is started next time, the in-vehicle server 3 is normally started, and data wireless communication processing can be performed between the software defined radio 4 and the radio communication device outside the vehicle.
According to the first embodiment, during the shutdown process (end process) of the in-vehicle server 3, even if the ignition switch is turned on and the vehicle is started again, the power supply switching circuit 14 disconnects the main in-vehicle power supply 5. Since the voltage drop is detected and the power supply from the main vehicle-mounted power supply 5 is switched to the power supply from the auxiliary vehicle-mounted power supply 6, even if the power load of the main vehicle-mounted power supply 5 increases due to the start of the vehicle, an abnormality may occur in the HDD 16a. Therefore, the next data wireless communication process can be performed normally.
It should be noted that substantially the same operation and effect can be obtained even when the power supply voltage (power) is reduced when the in-vehicle server 3 is started (during start-up processing).
[0030]
(Second embodiment)
FIGS. 3 to 6 show a second embodiment of the present invention. The difference from the first embodiment is that a plurality of drive system devices for driving a vehicle are configured to be sequentially started. It is in. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Hereinafter, different parts will be described.
In the present embodiment, a server / drive system device power switching circuit 20 is provided instead of the server power switching circuit 9 described in the first embodiment. Further, a drive system device operation determination unit 21 is connected to the communication I / F circuit 11. The drive system device operation determination unit 21 is configured to detect and determine the operation of the drive system devices 22 to 24 that are high-load devices. The drive system devices 22 to 24 are configured to include a traveling system ECU, and include control circuits 22a to 24a for controlling a power supply, and actuators 22b to 24b and the like connected to the power supply control circuits 22a to 24a. have.
[0031]
The drive system devices 22 to 24 include an ignition system device such as a starter of an internal combustion engine, an electronic control fuel injection device, a hydraulic system (steering and brake control), and the like, and drive the actuators 22 b to 24 b. It works with. When electric power is supplied to the actuators 22b to 24b by the control circuits 22a to 24a, the drive system ECUs 22c to 24c drive-control each part of the vehicle. The power supplied to the actuators 22b to 24b may be directly supplied from the power control unit 2.
[0032]
Control lines are respectively connected between the communication I / F circuit 11 and the control circuits 22a to 24a, and a power supply is connected between the control circuits 22a to 24a and the server / drive system power supply switching circuit 20. The supply lines are respectively connected. The power supply control circuits 22 a to 24 a supply power to the drive system devices 22 to 24 based on a command from the control circuit 7.
[0033]
Hereinafter, the operation of the power supply control unit when the vehicle starts will be described with reference to FIGS. Note that, in the present embodiment, the description will be given on the assumption that the shutdown processing of the in-vehicle server 3 ends after a certain time has elapsed after the ignition switch is turned off, but the shutdown processing described in the first embodiment is performed. The case can also be applied.
In an initial state in which the power supply control unit 2 is attached to the vehicle, the power is switched from the main vehicle-mounted power supply 5 to the vehicle-mounted server 3, the software defined radio 4, and the drive system devices 22 to 24.
[0034]
In FIG. 4 showing the operation of the power supply control unit at the time of starting, in a state where the ignition switch is turned off, the control circuit 7 of the power supply control unit 2 includes the power supply switching circuit 20 for the server / drive system and the power supply for the peripheral device. A voltage input to the switching circuit 10 is detected (S1), and it is determined whether or not this voltage has decreased (S2). If the voltage has dropped, the LED (not shown) provided in the power control unit 2 is turned on or a buzzer sounds to notify the outside that the voltage has dropped (S3), and the power supply is stopped. Then, the output of the power supply switching circuit 20 is turned off (S4), and the operation stops (S5). In this case, external measures need to be taken.
[0035]
On the other hand, if the control circuit 7 detects in step S2 that the voltage has not dropped below the predetermined threshold value, it detects the operation of the ignition switch based on the detection of the start / stop signal. Here, if the power supply voltage is stable when the ignition switch is turned on (ACC → ON, START position) (S7 → YES, S8 → YES), the control circuit 7 reads the drive system device 22 from the memory 8 The power supply timing to the drive system devices 22 to 24 is read (S9), and a timing signal is transmitted to the control circuits 22a to 24a of the drive system devices 22 to 24 to control the power supply to the drive system devices 22 to 24. The control circuits 22a to 24a supply power to the actuators 22b to 24b at the transmitted designated timing, and sequentially start the drive system devices 22 to 24. Specifically, an ignition system device such as a starter of an internal combustion engine is started, and thereafter, an electronic control fuel injection device and a hydraulic system are started (see FIGS. 6D and 6E). At the time of starting, the ignition system requires a starting voltage to flow an inrush current, and when an electronic control fuel injection device, a hydraulic system, and the like are started simultaneously with the ignition system, a large amount of power is consumed. Therefore, the power load can be distributed.
[0036]
After this predetermined time, the drive system device operation determination unit 21 determines whether all of the drive system devices 22 to 24 are operating, and if it determines that they are not operating (S11: NO), the control circuit 7 Based on the detection of the supply voltage input to the power supply switching circuit 20 for the server / drive system device, it is determined whether the set power is supplied to the drive system devices 22 to 24 (S12). If the power is normally supplied to the drive system devices 24 to 24, it is determined that the drive system devices 22 to 24 are abnormal, and is notified (S13). If the set power is not supplied in step S12, it is determined that there is an abnormality in the power supply control unit 2 and notified (S14).
[0037]
In step S11, if the control circuit 7 determines that all of the drive system devices 22 to 24 are operating (S11: YES), the control circuit 7 turns on the output of the peripheral device power switching circuit 10 (S15), and furthermore, the server Power is supplied to the in-vehicle server 3 from the power supply switching circuit 20 for drive system devices (S16). In this case, the control circuit 7 transmits a start command, for example, in the order of the packet communication device 4b, the DSRC in-vehicle device 4a, and the GPS receiver 4c via the peripheral device power switching circuit 10 to start (FIG. 6 (g), (g) h)). Thereafter, the control circuit 7 transmits a start command to the start detection circuit 18 of the on-vehicle server 3 and starts the start. In this case, the in-vehicle server control circuit 16 can establish communication with the software defined radio 4.
[0038]
Thereafter, if the in-vehicle server operation determination unit 15 detects a normal operation of the in-vehicle server 3, the mode shifts to an in-vehicle server operation mode to be described later (S18) and ends. If the normal operation is not detected (S17: NO), the LED is turned off. Is turned on or a buzzer sounds to notify the outside (S19), and the power supply to the in-vehicle server 3 is stopped (S20). Before the output of the power supply to the vehicle-mounted server 3 is stopped, the current position of the vehicle (detected by the GPS receiver 4c or the like) and the abnormal state of the power supply are detected from the vehicle-mounted server 3 via the packet communication device 4b of the software defined radio 4 outside the vehicle. It may be configured to transmit to a wireless communication device. Thus, it is possible to determine what kind of failure has occurred outside the vehicle via the wireless communication device, and it is possible to respond quickly.
[0039]
Hereinafter, an operation of shifting from the operation state (in-vehicle server operation mode) of the in-vehicle server 3 to the stop state will be described.
The control circuit 7 of the power supply control unit 2 detects the input voltage of the power supply switching circuit 20 for the server / drive system device periodically (T1, T2) while checking the passage of time, so that this voltage falls within the specified range. If not (T3: NO), the start / stop signal is detected to detect and confirm that the ignition switch has been turned off (T4: YES).
[0040]
If the control circuit 7 determines in step T3 that the voltage is low when the voltage does not fall within the prescribed range (T5: NO), the control circuit 7 turns on the LED or sounds a buzzer to notify the output abnormality and notify the power supply. The operation of the control unit 2 is stopped (T6 to T8). In step T5, if the voltage is lower than a predetermined voltage, the control circuit 7 notifies the outside by lighting an LED or sounding a buzzer (T9). This is because if the voltage drops even while the in-vehicle server 3 is operating, it is necessary to perform safe control. In this case, the driver is notified to park the vehicle in a safe place. I do. When detecting that the ignition switch has been turned off (confirming that the vehicle has stopped), the control circuit 7 reads from the memory 8 the timing of stopping the power supply to the drive system devices 22 to 24, and determines this timing with the control circuits 22a to 24a. The power supply control circuits 22a to 24a stop supplying power to the drive system devices 22 to 24 at the transmitted timing.
[0041]
Therefore, the drive system device operation determination unit 21 determines whether all of the drive system devices 22 to 24 have stopped (T12), and if not stopped, the set power is supplied to the drive system devices 22 to 24. It is detected whether or not there is any abnormality (T13). If the system is stopped in spite of the supply of the set power, it is notified by an LED and a buzzer that an abnormality has occurred in the drive system devices 22 to 24. (T14), when the set power is not supplied and the operation is stopped (T13: NO), the fact that an abnormality has occurred in the power supply control unit 2 is notified by the LED and the buzzer (T15), and the process ends.
On the other hand, in step T12, when the drive system device operation determination unit 21 determines that all of the drive system devices 22 to 24 are stopped, the drive system device operation determination unit 21 transmits a stop command to the vehicle server control circuit 16 based on the stop command. To stop.
[0042]
The in-vehicle server operation determination unit 15 determines whether the in-vehicle server 3 has completed communication. When the wireless communication between the software defined radio 4 and the radio communication device outside the vehicle is completed, the in-vehicle server control circuit 16 transmits a communication completion signal to the in-vehicle server operation determination unit 15. If the in-vehicle server control circuit 16 receives the communication completion signal before the predetermined time elapses (T17: YES), the control circuit 7 counts a timer provided inside (shutdown time). Is cleared (T18), and the in-vehicle server operation determination unit 15 detects whether or not the shutdown processing of the in-vehicle server 3 is completed (T19). In this case, the vehicle server 3 performs a shutdown process. Although not shown in FIG. 5, for example, if the ignition switch is turned on again during this shutdown processing, the power supply is switched by the power supply switching circuit 14. At this time, the control circuit 7 determines whether a predetermined time has elapsed by using a timer. The predetermined time indicates a time in which a margin is set in advance with respect to the set time at which the in-vehicle server 3 shuts down.
[0043]
Even if the in-vehicle server operation determination unit 15 detects that the shutdown processing of the in-vehicle server 3 has been completed (T19: YES), the process proceeds to step T21. In step T21, the control circuit 7 turns off the output of the power supply switching circuit 20 for the server / drive system device (T21), and turns off the output of the power supply switching circuit 10 for peripheral devices (T22). In this way, power control is performed.
[0044]
According to the second embodiment, the drive system devices 22 to 24, which are high-load devices, are sequentially started, so that the power loads of the drive system devices 22 to 24 can be dispersed, and the power supply voltage can be reduced. Can be prevented from sharply decreasing.
Since the power supply control unit 2 also controls the power supplies of the drive system devices 22 to 24, the power supply control circuits 22a to 24a are simplified compared to the configuration in which the power supply control circuits 22 to 24 control the power supplies of the respective drive system devices 22 to 24. Thus, the system cost of the entire vehicle can be reduced.
Since the drive system devices 22 to 24 are stopped before the operations of the in-vehicle server 3 and the software defined radio 4 are stopped, safety can be improved.
In order to notify the abnormality of the power supply control unit 2 or the drive system devices 22 to 24 to the outside by the LED or the buzzer, the user can instantaneously determine whether there is an abnormality in the power supply control unit 2 or the drive system devices 22 to 24. Can be grasped.
After the supply of the starting power to the plurality of drive system devices 22 to 24 by the control circuit 7 is completed, the power is sequentially supplied to the software defined radio 4 and the in-vehicle server 3, so that the power load can be further distributed and the power supply voltage can be further reduced. Can be prevented from sharply decreasing.
Note that the DSRC on-board unit 4a and the packet communication unit 4b are started before the on-board server 3, but if the on-board server 3 has a plug-and-play function, the DSRC on-board unit 4a and the packet communication unit 4b are not necessarily activated. There is no need to start first.
[0045]
(Other embodiments)
The present invention is not limited to the embodiment described above and illustrated in the drawings, and for example, the following modifications or extensions are possible.
In the first embodiment, the auxiliary vehicle-mounted power supply 6 is constituted by only a few lead storage batteries (secondary batteries) or AA dry batteries (primary batteries) having a smaller output capacity than the main vehicle-mounted power supply 5. Is also good. It usually takes about one second to start the engine of the vehicle. Therefore, the start time of the engine is shorter than the time (several seconds) for performing the shutdown process. In such a relatively short time, a dry battery having a smaller output capacity than the main vehicle-mounted power supply 5 can be applied as the auxiliary vehicle-mounted power supply 6. Further, a fuel cell (exchangeable type, fixed type) may be applied.
[0046]
In the above-described embodiment, the power supply switching circuit 14 is configured to independently switch the power supply when it detects that the voltage has decreased during the shutdown processing. However, the control circuit 7 is configured to control the switching of the power supply. May be. Specifically, in the first or second embodiment, the control circuit 7 and the power supply switching circuit 14 are connected by a control line so that the control circuit 7 can control the power supply switching of the power supply switching circuit 14. In this case, the in-vehicle server operation determination unit 15 detects the shutdown processing operation of the in-vehicle server 3 and detects that the voltage input from the power supply switching circuit 14 to the power supply switching circuits 9 and 10 has decreased. In such a case, the control circuit 7 performs power supply switching control via the power supply switching circuit 14. When the in-vehicle server operation determination unit 15 detects that the shutdown processing operation has been completed, the control circuit 7 performs power supply switching control again. Thus, when the in-vehicle server 3 operates, the power can be switched more reliably.
[0047]
At this time, when the in-vehicle server operation determination unit 15 detects that the processing shifts to the shutdown processing, the power may be switched to supply power from the auxiliary in-vehicle power supply 6. In short, as long as the power supply is switched to the power supply from the auxiliary vehicle-mounted power supply 6 during the start-up time of the vehicle, the switching means may switch the power supply at any timing.
[0048]
In the above description, in order to make the description easy to understand, the embodiment in which the control circuit 7 can detect the start signal or the stop signal immediately in response to the driver's on / off operation of the ignition switch is shown as the start / stop signal. However, actually, even if the ignition switch is operated from the off state to the on state or from the on state to the off state, there is no immediate response. Actually, the control circuit 7 is configured to receive a change in the start / stop signal on condition that it is detected that a predetermined time has elapsed after the detection of the operation of the ignition switch and that the state of the ignition switch has been stabilized. This is a function provided in consideration of occurrence of a malfunction by a driver or the like.
[0049]
The same concept can be applied to an in-vehicle wireless system mounted on an electric vehicle. Instead of the HDD 16a, the present invention may be applied to an electrically accessible nonvolatile memory.
Although the integrated radio is applied as the software defined radio 4, the radio may be any one of the DSRC in-vehicle device 4a, the packet communication device 4b, and the GPS receiver 4c, or may be a plurality of radio devices. good. In essence, any software radio device that communicates via radio may be used.
[Brief description of the drawings]
FIG. 1 is an electrical configuration diagram showing a first embodiment of the present invention.
FIG. 2 is a timing chart schematically showing an operation state.
FIG. 3 is a view corresponding to FIG. 1, showing a second embodiment of the present invention;
FIG. 4 is a flowchart showing the operation of the power supply control unit (part 1).
FIG. 5 is a flowchart showing the operation of the power supply control unit (part 2).
FIG. 6 is a timing chart showing an operation at the time of starting.
FIG. 7 is a diagram corresponding to FIG. 2 showing a conventional example.
[Explanation of symbols]
1 is an in-vehicle wireless system, 2 is a power control unit (power control unit for in-vehicle wireless system), 3 is an in-vehicle server (communication control means), 4 is a software defined radio, 5 is a main in-vehicle power supply (main power supply means), 6 Is an auxiliary vehicle power supply (auxiliary power supply means), 7 is a control circuit (power control means), 14 is a power supply switching circuit (switching means), 15 is an in-vehicle server operation determination unit (operation determination unit), and 16 is an in-vehicle server control circuit , 16a are hard disk drives (non-volatile storage units).

Claims (8)

A software defined radio that can support different communication systems by changing software,
Main power supply means for supplying power to the vehicle body,
Auxiliary power supply means capable of supplying power of a constant voltage substantially the same as the supply voltage of the main power supply means,
The software is written into the software defined radio as required, and the startup and termination processes for accessing the non-volatile storage unit for storing the setting information are normally executed to start and stop. Communication control means for performing data communication with the outside via a wireless device,
A vehicle-mounted wireless system, comprising: a switching unit that switches the main power supply unit and the auxiliary power control unit to supply power to the communication control unit from a higher power supply voltage. 2. The on-vehicle wireless system according to claim 1, wherein the auxiliary power supply unit is configured by a secondary battery or a primary battery having a smaller output capacity than the main power supply unit. An operation determining unit that determines an operation state of the communication control unit; the switching unit includes a main power supply unit that is configured to perform the main power supply unit when the operation control unit determines that the communication control unit is performing a start process or an end process; 3. The in-vehicle wireless system according to claim 1, wherein switching is performed so that power is supplied from the auxiliary power supply unit to the communication control unit during a period in which the supply voltage from the power supply decreases. Power supply control means for controlling the supply of electric power from the main power supply means or the auxiliary power supply means to the high load device so as to sequentially start the plurality of high load devices. 4. The in-vehicle device according to 1 or 3. The software is written to the software defined radio as necessary to change the software, and the startup and termination processes for accessing the non-volatile storage unit for storing the setting information are normally executed, thereby starting and stopping the software. A main power supply for supplying power to the vehicle body and a constant voltage substantially the same as the constant voltage supplied from the main power supply are supplied to communication control means for executing data communication with the outside via a wireless device. A power supply control unit for an in-vehicle wireless system, comprising: switching means for switching the power supply voltage from a higher auxiliary power supply means to supply power to the communication control means. The power supply control unit for an in-vehicle wireless system according to claim 5, wherein the auxiliary power supply means comprises a secondary battery or a primary battery having a smaller output capacity than the main power supply means. An operation determining unit that determines an operation state of the communication control unit; the switching unit includes a main power supply unit that is configured to perform the main power supply unit when the operation control unit determines that the communication control unit is performing a start process or an end process; 7. The power supply control unit for a vehicle-mounted wireless system according to claim 5, wherein switching is performed so that power is supplied from the auxiliary power supply means to the communication control means during a period in which the supply voltage from the power supply decreases. Power supply control means for controlling the supply of electric power from the main power supply means or the auxiliary power supply means to the high load device so as to sequentially guide the plurality of high load devices. 8. The power supply control unit for an in-vehicle wireless system according to 5 or 7.

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