JP4538420B2 - In-vehicle wireless communication device - Google Patents

Description

  The present invention relates to an in-vehicle wireless communication device, and more particularly to power supply thereof.

  In the conventional in-vehicle wireless communication device, as the power supply method, the in-vehicle battery and the auxiliary battery built in the wireless communication device are switched and used, and the auxiliary battery is used when the engine is stopped such as when the vehicle is parked. At times, there is a battery that supplies a stable power to a communication circuit by charging an auxiliary battery while using a vehicle-mounted battery.

  In such an in-vehicle wireless device, when the wireless communication device is connected to the vehicle and the ignition switch is detected ON, the power is switched to the in-vehicle battery, and the auxiliary battery is supplied with power through the charging circuit. Charged. Further, when the vehicle stops and the ignition switch is turned off, the power source is switched to the auxiliary battery and the power source from the in-vehicle battery is shut off to prevent the in-vehicle battery from being consumed (see, for example, Patent Document 1).

JP-A-7-273717

  In-vehicle wireless communication devices are increasingly used in anti-theft services when a car is parked, and it is desired to extend the standby time of the communication device during parking. However, in the auxiliary battery in the conventional in-vehicle wireless communication device, there is a problem that the communication device cannot be used if the engine of the vehicle becomes long and the auxiliary battery is discharged.

  The present invention is based on the state of the vehicle, the state of charge of the auxiliary battery, and the state of charge of the in-vehicle battery, ON / OFF of the charging operation from the in-vehicle battery to the auxiliary battery, and the power supply from the auxiliary battery or the in-vehicle power source. Means for switching the power supply independently of each other is provided.

  It becomes possible to lengthen the standby time of the communication circuit during parking of the in-vehicle wireless communication device.

  FIG. 1 is a configuration diagram of an in-vehicle wireless communication device according to an embodiment of the present invention.

  The automobile 200 includes an in-vehicle battery 201 and an ignition switch 202. The ignition switch 202 is turned on during traveling. The in-vehicle information device 210 is, for example, an in-vehicle navigation system, but can provide an information communication service by using the wireless communication device 100. Note that the vehicle state information is input from the ignition switch 202 into the wireless communication apparatus via a vehicle state input unit (for example, an antenna or a connector) (not shown).

  The wireless communication apparatus 100 converts the auxiliary battery 101 for the wireless communication apparatus, the power supply circuit 1 (102) for supplying power to the communication circuit 110 and the power supply control circuit 120, and converts the power from the in-vehicle battery 201 to the voltage of the wireless communication apparatus. Power supply circuit 2 (103) to be supplied, charging circuit (104) for charging the auxiliary battery, switch 105 for switching power supply to the power supply circuit 1 (102) between the in-vehicle battery 201 and the auxiliary battery 101, a charging circuit A switch 106 for switching supply of power to 104 is provided. Note that power is supplied from the in-vehicle battery 201 to the inside of the wireless communication apparatus 100 via an in-vehicle power input unit (not shown) (for example, a power connector).

  The communication circuit 110 is connected to an in-vehicle information device 210 such as a navigation system, and is used for providing an information communication service during driving of the automobile. Communication means such as RS232C, USB, or in-vehicle network is used for communication. Also, it is used to connect to anti-theft sensors etc. to notify the administrator of theft while the car is parked, or to receive the vehicle position information request from the administrator to notify the vehicle position information . The communication circuit 110 is mainly a communication circuit based on a mobile phone. However, the communication circuit 110 is not limited to this, and a wireless LAN, DSRC, or the like, or a circuit combining these can also be used. Information is transmitted from the in-vehicle information device 210 to the inside of the wireless communication device via an unillustrated in-vehicle information input unit (for example, an antenna or a connector) corresponding to the communication method.

  The power control circuit 120 includes a voltage detection means 1 (121) for detecting the state of the ignition switch 202, a voltage detection means 2 (122) for detecting the charge state of the on-vehicle battery, and a charge state of the auxiliary battery. The voltage detection means 3 (123) is switched, the charging circuit switch 106 is switched by the charge switching control means (124) according to the state, and the power switching switch 105 is switched by the power switching control means 125. Further, the communication circuit power mode switching control means 126 switches the power consumption mode of the communication circuit 110, and the notification output means 127 notifies the administrator of the status of the in-vehicle battery and the auxiliary battery using the communication circuit 110. The detection of the state of the ignition switch is not limited to the detection of the voltage, but a switch input circuit or a means for detecting the power generation state of the generator of the vehicle may be used although not shown in the figure. Further, the detection of the state of charge of the battery is not limited to the detection of the voltage, and means for detecting the remaining charge capacity may be used.

  Next, the operation of this embodiment will be described with reference to FIGS.

  FIG. 2 shows a state transition of the power supply control circuit in the example of FIG. FIG. 3 is a diagram illustrating the state in FIG. 2 and an operation explanatory diagram of the power supply control circuit 120 in each state.

S0 is the driving state of the automobile, and the ignition switch (IGN_SW) is ON. The changeover switch 105 is on the in-vehicle battery side, and power is supplied to the power supply circuit 1 (102) from the in-vehicle battery 201 via the power supply circuit 2 (103). In addition, the changeover switch 106 is turned on and the auxiliary battery 101 is charged via the charging circuit 104. The charging circuit 104 may stop charging when the auxiliary battery 101 is fully charged.

  S1 is a case where the automobile stops and the ignition switch is turned OFF. In this state, the state is selected from five states S2 to S6 depending on the charging state of the in-vehicle battery 201 and the auxiliary battery 101.

  S2 is a case where both the in-vehicle battery 201 and the auxiliary battery 101 are higher than the reference voltage. The changeover switch 105 is on the auxiliary battery side, and power is supplied from the auxiliary battery 101 to the power supply circuit 1 (102). Further, the changeover switch 106 is turned off, and the auxiliary battery 101 is not charged. Here, the reference voltage of the in-vehicle battery is a state having a sufficient margin for starting the engine, and the reference voltage of the auxiliary battery is in a limit state necessary for communication.

  S3 is a case where the auxiliary battery 101 is lower than the reference voltage while the in-vehicle battery 201 is higher than the reference voltage. The changeover switch 105 is on the in-vehicle battery side, and power is supplied to the power supply circuit 1 (102) from the in-vehicle battery 201 via the power supply circuit 2 (103). Further, the changeover switch 106 is turned on for a certain time, and the auxiliary battery 101 is charged through the charging circuit 104, but then turned off and charging is stopped. Here, even if the auxiliary battery 101 becomes higher than the reference voltage, it does not return to the state of S2. In addition, a voltage drop of the auxiliary battery 101 is notified to the administrator via the communication circuit 110. Furthermore, by switching the communication mode of the communication circuit 110 to the power saving mode, the power consumption is reduced and the standby time is lengthened. The power saving mode of the communication circuit 110 is realized, for example, by turning off the power of the receiving circuit at regular intervals. Even in this case, by notifying the administrator at the time of notification to the administrator when the auxiliary battery voltage is reduced, communication at an arbitrary timing is limited, but the reception function from the administrator can be used.

  S4 is a case where the in-vehicle battery 201 is lower than the reference voltage. The changeover switch 105 is on the auxiliary battery side, and power is supplied from the auxiliary battery 101 to the power supply circuit 1 (102). Further, the changeover switch (106) is turned off and the auxiliary battery 101 is not charged. In addition, the administrator is notified of the voltage drop of the in-vehicle battery 201 via the communication circuit 110. Furthermore, by switching the communication mode of the communication circuit 110 to the power saving mode, the power consumption is reduced and the standby time is lengthened.

  S5 is a case where the voltage of the auxiliary battery 101 becomes 0 and it is detected that the auxiliary battery 101 is removed. The change-over switch 105 is on the vehicle battery side, and power is supplied to the power supply circuit 1 (102) from the vehicle battery 201 via the power supply circuit 2 (103). Further, the changeover switch 106 is turned off and the auxiliary battery 101 is not charged. In this state, there is a risk of theft of the vehicle, so the administrator is notified of the removal of the auxiliary battery 101 via the communication circuit 110.

  S6 is a case where it is detected that the voltage of the in-vehicle battery 201 becomes 0 (zero) and the in-vehicle battery 201 is removed. The changeover switch 105 is on the auxiliary battery side, and power is supplied from the auxiliary battery 101 to the power supply circuit 1 (102). Further, the changeover switch 106 is turned off and the auxiliary battery 101 is not charged. In this state, there is a risk of theft of the vehicle, so the administrator is notified of the removal of the in-vehicle battery 201 via the communication circuit 110. In this embodiment, the battery is removed by detecting the voltage. However, the present invention is not limited to this means. For example, a switch is provided at the battery attachment site to detect that the switch is switched by removing the battery. It is good also as a structure.

  In the state of S5 and S6, since it is an abnormal state, the power saving mode for restricting communication is not set.

When the ignition switch is turned ON in the state from S2 to S6, that is, S1, the state returns to the state of S0, the changeover switch 105 becomes the vehicle battery side, and the power supply circuit 1 (102) is connected to the power supply circuit 1 (102) via the power supply circuit 2 (103). Power is supplied. In addition, the changeover switch 106 is turned on and the auxiliary battery 101 is charged via the charging circuit 104.

In addition, the power supply control circuit 120 receives S2, S2 through an instruction from the administrator via the communication circuit 110.
In the state of S3, the auxiliary switch 101 can be charged by the charging circuit 104 with the changeover switch 106 turned ON. In an automobile usage mode in which the automobile is driven for a short time after parking for a long time, the auxiliary battery 101 may not be sufficiently charged during driving. In such a case, the auxiliary battery 101 is charged from the in-vehicle battery 201 by notifying the administrator in such a case, and charging is performed even for a short time by charging both the in-vehicle battery 201 and the auxiliary battery 101 during the operation of the automobile. Efficiency can be increased.

  FIG. 4 shows a configuration diagram of an in-vehicle wireless communication apparatus according to another embodiment of the present invention.

  The automobile 200 includes an in-vehicle battery 201 and an ignition switch 202, and the ignition switch 202 is turned on during traveling. The in-vehicle information device 210 is, for example, an in-vehicle navigation system, but can provide an information communication service by using the wireless communication device 100.

  The wireless communication device 300 includes a mobile phone module 310 and a communication adapter 320.

  The mobile phone module includes 310, a mobile phone control circuit 311, a mobile phone power supply circuit 312, a communication circuit 313, a charging circuit 314, and a mobile phone built-in battery 315.

  The mobile phone control circuit 311 receives the charging state of the mobile phone built-in battery 315 and the charging state of the in-vehicle battery 201 detected by the in-vehicle battery charging state detection circuit 332 and the ignition input to the vehicle state input circuit 331. The power supply and charging of the mobile phone 310 are controlled by controlling the mobile phone power supply circuit 312 and the charging circuit 314 according to the state of the switch 202 and the charge state of the battery 315 built in the mobile phone. Further, the communication circuit 313 communicates data of the in-vehicle information device 210 received via the notification circuit 333.

  In the communication adapter 320, the power supply circuit 321 supplies power to the mobile phone module 310 and the communication adapter control circuit 330.

  The power supply control circuit 330 includes a vehicle state input circuit 331 for detecting the state of the ignition switch 202, an in-vehicle battery state detection circuit 332 for detecting the charge state of the in-vehicle battery 201, and a communication signal from the in-vehicle information device 210. The notification circuit 333 notifies the mobile phone module 310 by superimposing or switching to the mobile phone module 310.

  FIG. 5 is an operation explanatory diagram of the mobile phone control circuit 311 of FIG.

Whether the mobile phone module 310 is connected as a connection state with the communication adapter 320 (OK) or not connected (NG), or the state of charge of the mobile phone built-in battery 315 is sufficient for communication (OK) or Whether communication is not possible (NG), the state of the ignition switch 202 detected by the vehicle state input circuit 331 of the communication adapter control circuit 330 is ON or OFF as information notified from the notification circuit 335, and the vehicle battery state Depending on whether the state of the in-vehicle battery 201 detected by the detection circuit 332 is sufficient for communication (OK) or lower than a communicable voltage (NG), notification to the administrator using the communication circuit 313, the mobile phone power supply circuit 312 The power from the vehicle battery 201 via the communication adapter power supply circuit 321 and the battery 315 built in the mobile phone Source to use the feed, determining the control content of whether to power-saving setting of the communication by whether the communication circuit 313 to charge the mobile phone internal battery 315 via the charging circuit 314.

  In the adapter connection state OK, the built-in battery state OK, and the vehicle state ON, no notification is given as a normal state during running, power is supplied on the vehicle battery side, the built-in battery is charged, and no power saving setting is set.

  In the adapter connection state OK, the built-in battery state OK, the vehicle state OFF, and the in-vehicle battery state OK, notification is not made as a normal state during parking, power supply is performed on the built-in battery side, the built-in battery is not charged, and no power saving is set.

  In the adapter connection state OK, the built-in battery state OK, the vehicle state OFF, and the in-vehicle battery state NG, notification is made that the in-vehicle battery voltage is lowered, the power supply is on the built-in battery side, the built-in battery is not charged, and the power saving setting is set.

  In the adapter connection state OK, the built-in battery state NG, and the vehicle state ON, notification is made that the built-in battery is deteriorated during traveling, power supply is on the vehicle battery side, no built-in battery charge, no power saving setting.

  In the adapter connection state OK, built-in battery state NG, vehicle state OFF, and in-vehicle battery state OK, it is notified that the built-in battery is low during parking, the power supply is on the in-vehicle battery side, and the built-in battery is charged in this state for only a fixed time. After that, the battery is not charged until the running state, and even if the built-in battery state is recovered by this charging, the built-in battery state is NG, and the state is maintained until the subsequent running state is charged, and the on-vehicle battery state NG and the adapter connection state NG To prepare for notification in case of transition to, and with power saving setting.

  In the adapter connection state OK, the built-in battery state NG, the vehicle state OFF, and the in-vehicle battery state NG, the operation becomes impossible because there is no power source that can be used. Since this state transitions after either the built-in battery state or the in-vehicle battery state is notified in the NG state, the manager side can grasp the state. Even if the built-in battery state is NG, the administrator is further notified when the built-in battery can be used.

  In the adapter connection state NG and the built-in battery state OK, a notification is given when an abnormality such as theft occurs, the power supply is on the built-in battery side, the built-in battery is not charged, and there is no power saving setting.

  In the adapter connection state NG and the built-in battery state NG, operation is not possible because there is no power source that can be used. Since this state changes after either the adapter connection state or the built-in battery state is notified in the NG state, the administrator side can grasp the state. Even if the built-in battery state is NG, the administrator is further notified when the built-in battery can be used.

As in this example, by using a mobile phone module as a communication function, when the correspondence to different mobile phone carriers or the communication method of the mobile phone is changed, the communication method for each country is changed. This can be done by replacing the mobile phone module. In addition, it is possible to easily cope with a new communication function such as a hybrid of a mobile phone and a wireless LAN.

  In this way, it is possible to lengthen the waiting time of the communication circuit during parking by controlling the power supply and the auxiliary battery charging according to the state of the in-vehicle battery and the auxiliary battery as the power supply system of the in-vehicle wireless communication device It becomes.

  Moreover, it becomes possible to lengthen the waiting time at the time of parking by switching the power consumption control of the communication circuit according to the state of the in-vehicle battery and the auxiliary battery.

  In addition, by notifying the administrator of changes in the state of the in-vehicle battery and the auxiliary battery via the communication circuit, it is possible to prompt the administrator to drive the vehicle and charge the battery before communication is disabled.

  In addition, it is possible to increase the charging efficiency during driving by charging the auxiliary battery from the in-vehicle battery during parking in accordance with an instruction from the administrator via the communication circuit.

  In the above description, the vehicle state (for example, whether the vehicle is running) is determined by the ON / OFF signal of the ignition switch 202. However, the vehicle speed signal, the accelerator signal, the gear position signal, the brake signal, the parking brake signal, Other signals, such as an external signal indicating that is located, may be used.

The block diagram of the vehicle-mounted radio | wireless communication apparatus which makes one Embodiment of this invention is shown. The state transition of the power supply control circuit in the example of FIG. 1 is shown. FIG. 2 is a diagram illustrating the states and an operation explanatory diagram of the power supply control circuit 120 in each state. The block diagram of the vehicle-mounted radio | wireless communication apparatus which makes other embodiment of this invention is shown. An operation explanatory diagram of the mobile phone control circuit 311 of FIG. 4 is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Wireless communication apparatus, 101 ... Auxiliary battery, 102 ... Power supply circuit 1, 103 ... Power supply circuit 2, 104 ... Charging circuit, 105, 106 ... Switch, 110 ... Communication circuit, 120 ... Power supply control circuit, 200 ... Car, 201 ... vehicle-mounted battery, 202 ... ignition switch, 210 ... vehicle-mounted information device.

Claims (4)

An auxiliary battery for supplying power to the communication circuit;
An in-vehicle power input unit for inputting power supplied from an in-vehicle battery mounted on the vehicle;
A charging circuit for charging the auxiliary battery by supplying power from the in-vehicle battery via the in-vehicle power input unit;
In-vehicle wireless communication device equipped with
A first switch for switching ON / OFF of power supply from the in-vehicle battery to the charging circuit;
A second switch for switching power supply to the communication circuit between the auxiliary battery and the in-vehicle power input unit;
A vehicle state input unit for inputting state information of the vehicle;
Vehicle state information input from the vehicle state input unit, auxiliary battery charge state information indicating the charge state of the auxiliary battery, and in-vehicle battery state information indicating the supply voltage of the in-vehicle battery input to the in-vehicle power input unit And a power control circuit for controlling the first switch and the second switch,
When it is determined that the vehicle is parked based on the vehicle state information, the power control circuit is configured to remove the auxiliary battery from the auxiliary battery if the amount of charge of the auxiliary battery based on the auxiliary battery charge state information is a predetermined value or more. When power is supplied to the communication circuit and the charge amount of the auxiliary battery is less than a predetermined value, the charge amount of the vehicle battery according to the vehicle battery status information is greater than or equal to a predetermined value from the vehicle battery by the second switch. Supplying power to the communication circuit and turning on the first switch for a predetermined time to charge the auxiliary battery by supplying power from the in-vehicle battery.
An in-vehicle wireless communication device characterized by the above. The in-vehicle wireless communication device according to claim 1,
Said power supply control circuit, the case-vehicle battery or the auxiliary battery is less than the predetermined amount of charge, vehicle wireless communication device characterized by switching the communication mode of the communication circuit. The in-vehicle wireless communication device according to claim 1,
It said power supply control circuit, the case-vehicle battery or the auxiliary battery is less than a predetermined amount of charge, or when said vehicle battery or the auxiliary battery is removed, it notifies the state to the outside through the communication circuit An in- vehicle wireless communication device characterized by the above . The in-vehicle wireless communication device according to claim 1,
The in- vehicle wireless communication device , wherein the power supply control circuit charges the auxiliary battery by turning on the first switch by an external signal via a communication circuit.

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