JP2003293914A - On-vehicle electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an on-vehicle electronic device to receive power from a main battery and a sub battery from being reset or initialized due to supplied voltage reduction in operating a starter. <P>SOLUTION: A control CPU 3 of a telematique device 10 receiving the power for an operation from the main battery 12 for supplying power to the starter 14 of a prime mover of a vehicle, and from the sub battery 15 charged by receiving the power from the main battery 12, blocks power from the sub battery 15 to the starter 14 in operating the starter 14. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle electronic device that receives electric power for operation from a main battery and a sub battery in a vehicle, and is suitable for use in an emergency call system using a telematics ECU, for example.

[0002]

2. Description of the Related Art Conventionally, there is an on-vehicle electronic device which receives power from a sub battery in addition to a main battery of a vehicle. For example, an emergency call device having a function of detecting an accident in a vehicle by an airbag deployment signal and wirelessly notifying an emergency call center of an emergency situation may have a sub battery in addition to the main battery. Since the emergency notification device has a sub-battery, even if the power supply from the main battery is impossible due to the influence of an accident or failure, the power supply from the sub-battery is used instead of the main battery. Can receive.

Further, the sub-battery is of a type that can be charged like a secondary battery, and the charging is generally performed by supplying power from the main battery.

[0004]

However, if the sub-battery supplied with power from the main battery is connected to the starter or alternator which also operates with supply of power from the main battery, the ignition key of the vehicle is Is in the START position, that is, when the starter is operating, the voltage supplied to the electronic device may be lower than the voltages of the main battery and the sub battery. In this case, the electronic device may be reset. For example, in the emergency call device described above, if the reset is performed while the starter is operating in this way, communication will be interrupted during the call to the emergency call center,
Further, there is a problem that it takes time to initialize the emergency call device after the reset, and it becomes impossible for the emergency call center side to immediately know the emergency state of the occupant of the vehicle.

In view of the above points, an object of the present invention is to prevent an on-vehicle electronic device, which is supplied with power by a main battery and a sub battery, from being reset and initialized by a decrease in supply voltage when the starter is operating.

[0006]

In order to achieve the above object, the invention according to claim 1 is an on-vehicle electronic device mounted on a vehicle, which operates by receiving power supply,
A processing device (3) for resetting and initializing when the supply voltage value of the power supply falls below a predetermined supply voltage value, and a main battery (12) for supplying power to the starter (14) of the prime mover of the vehicle, And a starter (14) to receive electric power from the main battery (12) to charge the sub battery (15) and output electric power for operating the processing device. The processing device includes a power supply circuit (5), and the processing device includes a starter (14) and a sub-battery (1) when the starter (14) is operating without interrupting power supply from the sub-battery to the power supply circuit.
5) Connection / blocking means for switching connection / blocking with (1)
The vehicle-mounted electronic device according to claim 1, further comprising: disconnection control means for controlling the connection / interruption means so that the starter (14) and the sub-battery (15) are disconnected by controlling 1).

Thus, the processing unit of the vehicle-mounted electronic device, which is supplied with electric power from the main battery and the sub-battery by the power supply circuit, controls the connecting / disconnecting means when the starter of the vehicle is operating by the disconnecting means. Then, the connection between the starter and the sub-battery is cut off, so that electric power is not supplied from the sub-battery to the starter, and it is possible to prevent reset and initialization due to a decrease in supply voltage when the starter operates.

According to a second aspect of the present invention, in the vehicle-mounted electronic device according to the first aspect, the starter (14) is operating as the breaking means, and the sub-battery (15) is further provided.
When the output voltage value of is more than the specified voltage value,
By controlling the shut-off means (11), the starter (1
4) and the sub-battery (15) are cut off so that the connecting / cutting means is controlled.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of a power supply system in a vehicle according to an embodiment of the present invention. This power feeding system includes a telematics device 10, a switch 11, a main battery 12, an alternator 13, a starter 14, and a sub battery 15.

The main battery 12 is a main power source for supplying power to each device in the vehicle. The main battery 12 supplies electric power to the alternator 13, the starter 14, and the telematics device 10. Further, the main battery 12 can supply electric power to the sub battery 15 when the switch 11 is turned on.

The alternator 13 is an AC generator that generates electric power when the vehicle runs, and supplies electric power to the main battery 12, the alternator 13 and the telematics device 10 when the vehicle is running. Further, the alternator 13 uses the sub battery 15 when the switch 11 is turned on during traveling.
It is designed to supply power to.

The starter 14 is for starting the engine of the vehicle. The starter 14 is adapted to receive power supply from the main battery 12 during operation.

The switch 11 is a telematics device 10.
It is switched on and off under the control of. When the switch 11 is on, the sub battery 15 is electrically connected to the main battery 12 and the starter 14. Also, the switch 11
When is off, the sub-battery 15 is electrically disconnected from the main battery 12, the alternator 13, and the starter 14.

The sub-battery 15 is a rechargeable secondary battery. The sub battery 15 supplies electric power to the telematics device 10. The sub-battery 15 is electrically connected to the main battery 12, the alternator 13, and the starter 14 when the switch 11 is on, and is supplied with power from the main battery 12 and the alternator 13 in the same system as the starter 14. . When the switch 11 is off, the main battery 12,
The electrical connection with the alternator 13 and the starter 14 is cut off.

The telematics device 10 is an electronic device mounted on a vehicle for utilizing telematics services. Telematics is a general term for systems that provide various services by integrally utilizing GPS, wireless mobile phones, the Internet, and the like. For example, an emergency call service in which an emergency call center that knows the position of a vehicle promptly handles an accident by notifying the position of the vehicle to the emergency call center at the time of an accident is one implementation of telematics. In this sense, the telematics device 10 is also an emergency notification device.

The telematics device 10 includes a GPS receiver 1, a wireless communication module 2, a control CPU 3, a memory 4,
Power control device 5, in-vehicle LAN interface 7, GP
It is composed of an S antenna 8 and a wireless communication antenna 9.

The GPS receiver 1 uses the GPS antenna 8 and receives the current position information and time information of the GPS satellites from the GPS satellites to detect the position of the mounted vehicle. Further, the GPS receiver 1 has a GPS memory (not shown), in which the GPS satellite position information and the like used for detecting the position of the vehicle are recorded. The GPS receiver 1 is controlled by the control CPU 3 and transmits information on the detected position of the mounted vehicle to the control CPU 3. The GPS receiver 1 operates by receiving power supply from the power supply controller 5, and stops operating when the power supply is cut off.

The wireless communication module 2 uses the wireless communication antenna 9 to perform wireless communication with the outside of the vehicle. The wireless communication module 2 is controlled by the control CPU 3 so that communication data can be exchanged with the control CPU 3. In addition, this wireless communication module 2
Operates by being supplied with power from the power supply control device 5.

The power supply control device 5 receives power from the external main battery 12, sub battery 15, and alternator 13 and supplies them to the GPS receiver 1, the wireless communication module 2, and the control CPU 3, respectively. Further, the power supply control device 5 divides the output voltage from the sub-battery 15 at a predetermined voltage division ratio and outputs it to an AD conversion terminal (not shown) of the control CPU 3 when the switch 11 is off. When the switch 11 is off, the power supply control device 5 selects one of the power supply from the sub-battery 15 and the power supply from the main battery 12 and the alternator 13.
It receives power from the one with the higher output voltage.

The control CPU 3 is a processing device that performs processing such as communication for receiving telematics services.
The operation mode of the control CPU 3 includes an active mode in which normal operation is performed and a sleep mode in which limited processing such as detection processing of an input signal is performed with low power consumption. The control CPU 3 is capable of transitioning between the active mode and the sleep mode by its own processing. Further, the control CPU 3 is adapted to receive power supply from the power supply control device 5 to perform operation and processing, and is reset and initialized when the supply voltage decreases.

Further, the control CPU 3 uses the GPS if necessary.
The receiver 1 is controlled to acquire the position information of the mounted vehicle. If necessary, the wireless communication module 2
It is possible to exchange communication data by controlling the.

Further, the control CPU 3 is connected to an in-vehicle LAN via an in-vehicle LAN interface 7, and receives information from in-vehicle devices (not shown) such as airbags and operation buttons via this in-vehicle LAN. It has become. Further, the control CPU 3 reads the voltage of the sub-battery divided by the power supply control device 5 by AD conversion, and thereby detects the voltage from the sub-battery 15. Further, the control CPU 3 uses the switch 1
1 is controlled. Further, the control CPU 3
Information can be recorded in the memory 4 including a storage element as required, and information can be read from the memory 4 as required.

Further, the control CPU 3 determines that the position of the vehicle ignition key is RUN (ON) or ACC from the outside.
RUN / ACC signal for notifying whether or not Further, the control CPU 3 is adapted to receive a RUN / START signal from outside for notifying whether the position of the ignition key is RUN or START. The RUN / START signal is also called the IG signal. The control CPU 3 receives and decodes the signals from these two control lines, and thereby can detect whether the ignition key is in the RUN, START, ACC or OFF position.

The telematics device 1 having the above structure
The outline of the telematics emergency call service used by 0 is as follows. When the vehicle causes an accident and the airbag is deployed, the control CPU 3 detects the airbag deployment through the in-vehicle LAN. Alternatively, an occupant of the vehicle inputs information indicating that an accident has occurred from the operation button, and the control CPU 3 detects the information via the in-vehicle LAN. The control CPU 3 that has detected the occurrence of the accident in this way uses the GPS
The receiver 1 is controlled to acquire the current position information of the vehicle, and the wireless communication module 2 is controlled to notify the emergency notification center of the current position information and information indicating that an accident has occurred. Upon receiving this notification, the emergency call center notifies the police and hospital of the location of the accident. With such an emergency call service, it becomes possible to perform prompt processing in an emergency situation such as an accident.

The telematics device 10 performing such an operation has the sub-battery 15, so that the power supply from the main battery 12 is caused by the influence of an accident, a failure or the like when processing the emergency call service. Even when it is not possible, power can be supplied from the sub battery 15 instead of the main battery 12.

When the sub-battery 15 which receives power from the main battery 12 is connected to the starter 14 and the alternator 13 which also operate by receiving power from the main battery 12, the ignition key is set to START. When in the position, that is, when the starter is operating, the voltage supplied to the telematics device 10 may be lower than the voltages of the main battery and the sub battery. In this case, the control CPU 3 of the telematics device 10 is reset due to insufficient voltage, and there is a risk that communication with the emergency call center is interrupted due to initialization after reset.

At this time, if the switch 11 is off, the sub-battery 15 is electrically disconnected from the main battery 12, the alternator 13 and the starter 14, so that the sub-battery 15 is sufficiently charged. The voltage of the battery 15 and the voltage applied to the telematics device 10 become equal, the control CPU 3 does not reset due to the voltage drop, and there is no communication interruption due to reset and initialization.

In this embodiment, the control CPU 3 controls the switch 11 so that the voltage of the telematics device 10 does not become insufficient when the starter operates.

FIG. 2 is a flowchart showing a process for the control CPU 3 to control the switch 11. The control processing of the control CPU 3 will be described based on this figure.

First, the telematics device 10 is installed in the vehicle and is connected to the main battery 12 and the sub battery 15.

Then, the control CPU 3 controls the switch 11 to turn it off (step 205), sets a region for recording a flag based on the voltage of the sub-battery on the memory 4, and records this value as 0 ( Step 21
0).

Next, the control CPU 3 detects the state of the ignition key from the RUN / ACC signal and the RUN / START signal, and determines whether or not the ignition key is at the RUN position (step 215). When detecting that the ignition key is in the RUN position, the control CPU 3 puts itself in the active mode (step 2).
20).

Then, the switch 11 is controlled to be turned off (step 225), and it is determined whether or not the voltage value of the sub-battery is a predetermined value Vth or more (step 23).
0). The predetermined voltage value Vth is, for example, a voltage value that is high enough to prevent the telematics device 10 from being supplied and resetting.

The switch 11 is turned off in step 225 because only the voltage of the sub-battery 15 cannot be detected when the switch 11 is on. Next, if the voltage value of the sub battery is Vth or more, the flag value is recorded as 1 (step 235), and Vt
If it is less than h, the value of the flag is recorded as 0 (step 240). Then, the control CPU 3 turns on the switch 11 again (step 245), and the process thereafter is step 2
It returns to the determination process of 15.

In step 215, the ignition key is R
As long as it is in the UN position, the process repeats the determination of the sub-battery voltage in the loop of steps 215 to 245. In addition, in this loop, the control CPU 3 is in the active state, and in addition to the control processing of the switch 11, it performs telematics service processing and communication processing.

In step 215, the ignition key is set to R.
If it is determined that it is not in the UN position, that is, if the ignition key position is START, ACC, or OF.
If it is determined to be F, then the control CPU 3 determines whether the value of the flag is 0 or 1 (step 250),
If the flag is 1, the switch 11 is turned off (step 255). If the flag is 0, the state of the switch 11 is kept as it is. That is, when the voltage value of the sub-battery 15 is less than Vth, since the supply voltage from the sub-battery 15 is not sufficient in the first place, there is no difference even if the switch 11 is turned off or turned on. Then the control CPU
3 shifts to the sleep mode (step 260).

In this sleep mode, when the RUN / ACC or RUN / START signal changes due to the change of the state of the ignition key,
When there is an air bag signal or an emergency notification signal from the passenger input from N, the process interrupts and the control CP
U3 transitions to active mode (step 265),
If necessary, telematics service processing such as current position acquisition by the GPS receiver 1 and communication by the wireless communication module 2 is performed (step 270). Then, the process returns to step 205 again.

By such processing, the sub battery 1
If the voltage value of 5 is equal to or higher than Vth, the flag value is recorded as 1. If the starter operation is performed at this time,
That is, when the ignition key comes to the START position, the switch 11 is turned off in step 255 through the determination processing in steps 215 and 250. Therefore, the sub-battery 15 is electrically disconnected from the main battery 12, the alternator 13, and the starter 14, so that the telematics device 10 is supplied with sufficient electric power. Therefore, the main battery 12 and the sub battery 1
A telematics device 10 powered by 5,
It is possible to prevent resetting and initialization due to supply voltage drop when the starter operates.

When the ignition state is RUN, the sub battery 15 is the main battery 12
And since it is electrically connected to the alternator 13,
Can be charged.

In the above-described embodiment, the power supply control device 5 constitutes a power supply circuit which receives power supply for operation from the main battery and the sub-battery and outputs power for operating the processing device.

In the above embodiment, the control C
The PU 3 operates by receiving power supply, and when the value of the supply voltage falls below a predetermined supply voltage value, the PU 3 is reset to perform a process of performing initialization.

Further, in the above-described embodiment, the switch 11 constitutes a connection / interruption means for switching connection / interruption between the starter and the sub-battery without interrupting the power supply from the sub-battery to the power supply circuit.

In the above embodiment, steps 215, 250 and 25 of the control CPU 3 shown in FIG.
In the judgment and control process of 5, the starter is operating,
Further, when the output voltage value of the sub-battery is equal to or higher than a predetermined voltage value, a disconnecting means is configured to control the connecting / disconnecting means so that the starter and the sub-battery are disconnected.

However, according to the invention described in claim 1,
The disconnecting means only needs to control the connecting / disconnecting means so as to disconnect the connection between the sub-battery and the starter when the starter is operating, and if the output voltage value of the sub-battery is equal to or higher than a predetermined voltage value. The condition that there is is not mandatory.

In the above embodiment, the control C
PU3 is RUN, A of the vehicle by the ignition key
It is not necessary to detect CC, START, or OFF. For example, the detection may be performed by a signal from the in-vehicle LAN.

In the above embodiment, the on-vehicle telematics device 10 corresponds to the on-vehicle electronic device.
It does not necessarily have to be a telematics device.

Of the above-mentioned means, the means configured by the processing shown in the flow chart may be configured to realize the function of each means, and is necessarily configured by software processing. It does not need to be provided, and may be configured as dedicated hardware.

[Brief description of drawings]

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

FIG. 2 is a flowchart of a process for the control CPU 3 to control the switch 11.

[Explanation of symbols]

1 ... GPS receiver, 2 ... Wireless communication module, 3 ... Control CPU, 4 ... Memory, 5 ... Power supply control device, 7 ... In-vehicle LA
N interface, 8 ... GPS antenna, 9 ... Wireless communication antenna, 10 ... Telematics device, 11 ... Switch, 12 ... Main battery, 13 ... Alternator, 14
… Starter, 15… Sub battery.

Claims (2)

[Claims] 1. A vehicle-mounted electronic device mounted on a vehicle, which is activated by receiving power supply and resets and initializes when a supply voltage value of the power supply falls below a predetermined supply voltage value. The processing device (3) to perform, the main battery (12) for supplying electric power to the starter (14) of the motor of the vehicle, and the main battery (12) to supply the electric power by being connected to the starter (14). Sub battery (15) that receives and charges
A power supply circuit (5) that outputs electric power for operating the processing device when the starter (14) is operating. The starter (14) is controlled by controlling a connection / disconnection means (11) for switching connection / disconnection between the starter (14) and the sub-battery (15) without interrupting power supply to the power supply circuit.
And an interruption control means for controlling the connection / interruption means so that the sub-battery (15) is interrupted. 2. The disconnection means, when the starter (14) is operating and the output voltage value of the sub-battery (15) is equal to or higher than a predetermined voltage value, the connection / interruption means (11). By controlling the starter (1
4. The vehicle-mounted electronic device according to claim 1, wherein the connecting / disconnecting means is controlled so that 4) and the sub-battery (15) are disconnected from each other.