JP2014015161A - On-vehicle device and control method of the on-vehicle device - Google Patents

Abstract

The present invention relates to an in-vehicle apparatus mounted on an ignition key type vehicle, driven by an in-vehicle battery power source and controlling the driving based on an accessory power source, and a control method therefor. An object of the present invention is to avoid interruption of operation during driving when the engine is started.
A power supply state management unit 5 drives an in-vehicle device 1 based on a battery power signal, an ACC power signal digitized by a power supply circuit unit 3, and a vehicle key position acquired by a LAN information control unit 6. Is output to the drive control unit 4. The drive control unit 4 controls the drive of the in-vehicle device according to the output of the power supply state management unit.
[Selection] Figure 1

Description

  The present invention is mounted on a conventional ignition key type vehicle having OFF, ACC, ON, and START positions as key positions, is driven by an on-vehicle battery power source, and controls the driving based on an accessory power source, and a control method therefor About.

  Conventionally, in an ignition key type vehicle, when the engine is started, the accessory power supply is shut off, and the current from the battery is concentrated on the starter motor and ignition.

  Therefore, in-vehicle devices that are controlled by the accessory power source, that is, in-vehicle devices that are allowed to drive only when the accessory power source is supplied, the operation of the in-vehicle device that is being driven at engine startup is independent of the user's intention. It will be interrupted.

  As a technique for preventing the interruption of the operation of the on-vehicle device that is being driven at the time of starting the engine, for example, the technique disclosed in Document 1 is known.

  That is, when the engine is started, the state of the battery is checked, and if the battery has a margin, the accessory power supply is not shut off, and the accessory power supply is supplied to avoid operation interruption of the on-vehicle device being driven.

JP 2008-213708 A

  However, in the above-described conventional technology, the vehicle power management device requires determination means for determining whether or not the battery has a margin when the engine is started, which complicates the configuration of the power management device.

  The present invention relates to an in-vehicle device and a control method for the in-vehicle device that avoid operation interruption during driving at the time of engine start by referring to the key position of the vehicle without changing the configuration of the power management device. The purpose is to provide.

  The in-vehicle device according to the first aspect of the present invention is mounted in an ignition key type vehicle having OFF, ACC, ON, and START positions as key positions, is driven by an in-vehicle battery power source, and controls the driving based on an accessory power source. An in-vehicle device that converts an accessory power source input as an analog signal from a vehicle into a digital signal, a LAN information control unit that acquires a key position of the vehicle via an in-vehicle LAN, and the power source A power supply state management unit that outputs a control signal for permitting or prohibiting driving of the in-vehicle device based on a digital signal from the circuit unit and a key position from the LAN information control unit, and a vehicle based on the control signal from the power supply state management unit A drive control unit for controlling the driving of the in-vehicle device by the battery power from the power supply state management However, only when the output signal from the power supply circuit unit is off and the key position acquired by the LAN information control unit is off, the control signal for prohibiting the driving of the in-vehicle device is output to the drive control unit. It is a feature.

  The in-vehicle device of the present invention according to claim 2 is the in-vehicle device according to claim 1, wherein the power supply circuit unit converts the in-vehicle battery power input as an analog signal from the vehicle into a digital signal, and the power supply state management unit A voltage drop of the battery power supply is monitored based on the digital signal output from the power supply circuit unit, and when a voltage drop of the battery power supply is detected, a control signal for prohibiting driving of the in-vehicle device is output. It is.

  According to a third aspect of the present invention, there is provided an in-vehicle device according to the second aspect, wherein the power supply state management unit is configured to supply the battery power when the digital signal of the battery power converted by the power supply circuit unit is off for a certain period. It is characterized in that it is detected as a voltage drop.

  According to a fourth aspect of the present invention, there is provided a control method for an in-vehicle device according to the present invention, which is mounted on an ignition key type vehicle having key positions of OFF, ACC, ON, and START, driven by an in-vehicle battery power source, A method for controlling an in-vehicle device for controlling driving, wherein a first step of monitoring on / off of an accessory power source during driving of the in-vehicle device and a second step of acquiring a key position of the car when the accessory power source is off And a third step of stopping driving of the on-vehicle device being driven when the key position of the vehicle is OFF, and maintaining a driving state of the on-vehicle device being driven when the key position of the vehicle is other than OFF. It is.

  A control method for an in-vehicle device according to a fifth aspect of the present invention is the control method according to the fourth aspect, wherein when the key position of the vehicle is OFF, the driving of the in-vehicle device being driven is stopped. When the car key position is other than OFF, the battery power supply voltage drop is monitored, and when the voltage drop is detected, the driving of the on-vehicle device being driven is stopped. The step of maintaining the driving state of the in-vehicle device is characterized in that it is a step.

  A control method for an in-vehicle device according to a sixth aspect of the present invention is the control method according to the fifth aspect, wherein when the voltage drop of the battery power source continues for a certain period, the voltage drop of the battery power source is detected. To do.

  According to the present invention, by referring to the key position of the vehicle without changing the configuration of the power management device or the like, it is possible to avoid interruption of the operation of the on-vehicle device during driving when the engine is started with a simple configuration. .

The block diagram which shows the structure of the vehicle-mounted apparatus in embodiment of this invention, and the relationship with a vehicle Timing chart showing operation of in-vehicle device in embodiment of the present invention The flowchart which shows control of the vehicle-mounted apparatus in embodiment of this invention

  Hereinafter, a vehicle-mounted device and a method for controlling the vehicle-mounted device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the relationship between the configuration of an in-vehicle device according to an embodiment of the present invention and a vehicle in which the in-vehicle device is mounted.

In FIG. 1, an in-vehicle device 1 is mounted on an ignition key type vehicle, is driven by a battery power source 9 of the vehicle, and the drive is controlled based on an accessory power source 10. A CPU 2 that controls the entire in-vehicle device, The power supply circuit unit 3 is provided with a car battery power supply 9 and an accessory power supply 10 as inputs.

  The CPU 2 includes a LAN information control unit 6 that acquires the key position of the vehicle via the in-vehicle LAN 11, a drive control unit 4 that controls driving of the in-vehicle device by the battery power source 9 of the vehicle, and a signal from the power supply circuit unit 3. On the basis of the information from the LAN information control unit 6, a power supply state management unit 5 is provided that outputs a control signal that permits or prohibits driving of the in-vehicle device to the drive control unit 4.

  In the present embodiment, the drive control unit 4, the power supply state management unit 5, and the LAN information control unit 6 are each implemented as a program processed by the CPU 2.

  In FIG. 1, a battery power source 9, an accessory power source 10, a vehicle information control device 7, and an engine key 8 are provided in a vehicle on which an in-vehicle device is mounted, and the engine key 8 is OFF, ACC, There are ON and START positions. The vehicle information control device 7 manages vehicle information including key positions, and is connected to the in-vehicle device 1 by an in-vehicle LAN 11.

  Hereinafter, the operation of the in-vehicle device 1 will be described with reference to FIGS. 2 and 3. 2 shows the key position of the vehicle, the ACC power supply, the battery power supply, the ACC power supply signal that is the output signal of the power supply circuit unit 3, the battery power supply signal, the acquired information of the LAN information control unit 6, and the output signal of the power supply state management unit 5. It is a timing chart which shows the drive state of a vehicle-mounted apparatus.

  In FIG. 2, (a) key position indicates transition of the key position. According to the transition of the key position, the ACC power source and the battery power source are in the states shown in (b) and (c), respectively.

  When the key position is switched from OFF to ACC, the supply of ACC power starts, the key position is STRAT, and the battery power is concentrated on the engine start, so the ACC power is cut off. Further, (c) battery power supply indicates a temporary voltage drop of the battery power supply when the engine is started.

  The power supply circuit unit 3 shown in FIG. 1 uses the ACC power supply and battery power supply shown in FIGS. 2B and 2C inputted from the vehicle side as analog signals. ) It is converted into an ACC power signal and a battery power signal which are digital signals composed of ON and OFF signals shown in (e). The converted ACC power supply signal and battery power supply signal are output to the power supply state management unit 5.

  The power supply state management unit 5 is turned on (permitted) based on the ACC power supply signal, the battery power supply signal, and the key position acquired by the LAN information control unit 6 to the drive control unit 4 indicating a control signal indicating permission or prohibition of driving of the in-vehicle device , And output as an OFF (prohibited) signal. FIG. 2 (f) shows the key positions acquired by the LAN information control unit 6 via the in-vehicle LAN 11, and FIG. 2 (g) shows the output of the power supply state management unit 5.

  When the ACC power signal is ON, the power supply state management unit 5 outputs an ON signal that permits driving to the drive control unit 4 regardless of the battery power signal and the key position of the LAN information control unit 6.

When the ACC power signal is OFF, the key position is acquired from the LAN information control unit 6. When the key position is OFF, an OFF signal for prohibiting driving of the in-vehicle device is output to the drive control unit 4. In cases other than OFF, the battery power supply signal is checked for a voltage drop in the battery power supply. That is, when the battery power supply signal OFF continues for a certain period, for example, 50 milliseconds, it is determined that the voltage of the battery power supply has decreased. The reason for setting the fixed period is to prevent interruption of the operation of the on-vehicle device being driven due to a temporary voltage drop of the battery power supply shown in FIG. When the voltage drop of the battery power supply is detected, the power supply state management unit 5 outputs an OFF signal for prohibiting driving of the in-vehicle device to the drive control unit 4 in order to prevent the battery from being consumed or deteriorated. When a voltage drop of the battery power supply is not detected, an ON signal for permitting driving of the in-vehicle device is output to the drive control unit 4 even if the ACC power supply signal is OFF.

  The drive control unit 4 controls driving by the battery power source 9 of the in-vehicle device 1 according to a signal from the power supply state management unit 5 and an operation from a user (not shown).

  When the control signal from the power supply state management unit 5 is an ON signal that permits driving, an operation from the user is accepted and the in-vehicle device 1 is driven according to the operation. At the time of an OFF signal for prohibiting driving, driving is stopped if the in-vehicle device is driving. Also, no operation from the user is accepted.

  As shown in FIG. 2 (h), when the user performs an operation of driving the in-vehicle device while the output from the power supply state management unit 5 is ON, the in-vehicle device 1 changes from the stop state to the driving state (h1). ). Even when the ACC power signal is turned OFF during driving of the in-vehicle device (h2), if the key position is other than OFF and the voltage drop of the battery power source is not detected, the power supply state management unit 5 starts the in-vehicle device. Since the ON signal permitting the driving of the vehicle is output, the drive control unit 4 maintains the driving state of the in-vehicle device by the battery power source 9 (h2 to h4).

  On the other hand, when the ACC power signal is OFF and the key position is OFF, the power supply state management unit 5 outputs an OFF signal that prohibits driving of the in-vehicle device, so that the drive control unit 4 drives the in-vehicle device being driven. Stop (h4).

  As described above, when the ACC power signal is turned on, the in-vehicle device 1 of the present invention starts and stops in accordance with the user's operation as in the case of the conventional in-vehicle device. When the signal is turned off, the driving of the in-vehicle device is stopped regardless of the intention of the user, whereas in the in-vehicle device of the present invention, the power state management unit 5 refers to the key position, and the key position Only when the signal is OFF, a control signal for prohibiting driving and an OFF signal are output to the drive control unit 4 to stop driving the on-vehicle device being driven.

  In other words, the operation of the on-vehicle device being driven at the time of starting the engine has been interrupted irrespective of the intention of the user, but in the present invention, the driving at the time of engine star with a simple configuration by referring to the key position in the present invention It is possible to avoid interruption of the operation of the in-vehicle device.

  In the present embodiment, the power supply state management unit 5 outputs a control signal indicating permission or prohibition of driving of the in-vehicle device based on the ACC power signal, the battery power signal, and the key position acquired by the LAN information control unit 6. However, it is also possible to output the control signal based on the ACC power signal and the key position acquired by the LAN information control unit 6 regardless of the battery power signal.

  That is, when the ACC power signal is ON, an ON signal for permitting driving is output. When the ACC power signal is OFF, the key position is acquired from the LAN information control unit 6 and the key position is OFF. An OFF signal that prohibits driving of the in-vehicle device is output, and when the key position is other than OFF, an ON signal that permits driving may be output even if the ACC power signal is OFF.

  In this case, regardless of the voltage drop of the battery power supply, it is possible to reliably continue driving the on-vehicle device that is being driven, and to avoid re-drive processing of the on-vehicle device.

FIG. 3 is a flowchart showing control during driving of the in-vehicle device according to the present invention.
While the in-vehicle device is being driven, an ON signal permitting in-vehicle driving is output from the power supply state management unit 5 to the drive control unit 4.

  The power supply state management unit 5 monitors the ACC power supply signal and checks whether the ACC power supply signal has been turned off for a certain time, for example, 50 milliseconds (step 1). The reason for setting the fixed time is to prevent operation interruption of the on-vehicle apparatus being driven due to an instantaneous ACC power interruption. When the ACC power supply signal OFF is detected for a certain period (step 2), the power supply state management unit 5 acquires the key position from the LAN information control unit 6 (step 3), and determines whether the key position is OFF. Determine (step 4).

  In step 4, when the key position is OFF, the power supply state management unit 5 outputs an OFF signal for prohibiting driving of the in-vehicle device to the drive control unit 4, and the drive control unit 4 performs in-vehicle stop processing, for example, in the same state. Information necessary for re-driving the device is recorded (step 7), and driving of the in-vehicle device is stopped.

  In step 4, when the acquired key position is other than OFF, the power state management unit 5 monitors the battery power signal (step 5). When a battery voltage drop is detected by the battery power signal, that is, when a battery power signal OFF is continuously detected for a certain period of 50 milliseconds (step 6), consumption and deterioration of the battery power supply are avoided. Therefore, the power supply state management unit 5 outputs an OFF signal that prohibits driving of the in-vehicle device to the drive control unit 4, and proceeds to Step 7. Here, the fixed period is to prevent interruption of the operation of the on-vehicle device during driving due to a momentary voltage drop of the battery power supply.

  In step 6, when the battery power supply voltage drop is not detected, the process returns to step 1 to continue monitoring the ACC power supply. Also, in step 2, even when the ACC power supply signal OFF that has continued for a certain period is not detected, the process returns to step 1 to continue monitoring the ACC power supply.

  As described above, according to the control method of the present invention, by referring to the key position, it is possible to avoid the interruption of the operation of the on-vehicle device being driven due to the ACC power supply cutoff at the time of engine start.

  In step 4, when the key position is not OFF, it is possible to return to step 1 and continue monitoring the ACC power supply signal.

  In this case, regardless of the voltage drop of the battery power supply, it is possible to reliably continue driving the on-vehicle device that is being driven, and to avoid re-drive processing of the on-vehicle device.

    As described above, the present invention can avoid the interruption of the operation of the in-vehicle device when the engine is started by referring to the key position, and can be applied to a car audio device, a car navigation device, or the like. Is possible.

1 In-vehicle device 2 CPU
DESCRIPTION OF SYMBOLS 3 Power supply circuit part 4 Drive control part 5 Power supply state management part 6 LAN information control part 7 Vehicle information control apparatus 8 Engine key 9 Battery power supply 10 Accessory power supply 11 Vehicle-mounted LAN

Claims (6)

An in-vehicle device that is mounted on an ignition key type car having OFF, ACC, ON, and START positions as key positions, is driven by an in-vehicle battery power source, and controls the driving based on an accessory power source,
A power supply circuit unit for converting an accessory power source input as an analog signal from a car into a digital signal;
A LAN information control unit for acquiring a key position of a car via a vehicle-mounted LAN;
A power supply state management unit that outputs a control signal that permits or prohibits driving of the in-vehicle device based on a digital signal from the power supply circuit unit and a key position from the LAN information control unit;
A drive control unit that controls driving of the in-vehicle device by battery power from a vehicle based on a control signal from the power supply state management unit;
The power supply state management unit outputs a control signal that prohibits driving of the in-vehicle device only when the output signal from the power supply circuit unit is off and the key position acquired by the LAN information control unit is off. The vehicle-mounted device characterized by outputting to   The power supply circuit unit converts the in-vehicle battery power input as an analog signal from the car into a digital signal, and the power supply state management unit monitors the voltage drop of the battery power supply based on the digital signal output from the power supply circuit unit. The in-vehicle device according to claim 1, wherein a control signal for prohibiting driving of the in-vehicle device is output when a voltage drop of the battery power supply is detected.   3. The in-vehicle apparatus according to claim 2, wherein the power supply state management unit detects the voltage drop of the battery power supply when the digital signal of the battery power converted by the power supply circuit unit is off for a certain period. A control method for an in-vehicle device that is mounted on an ignition key type vehicle having OFF, ACC, ON, and START positions as key positions, is driven by an in-vehicle battery power source, and controls the driving based on an accessory power source,
A first step of monitoring on / off of the accessory power supply during driving of the in-vehicle device;
A second step of obtaining the key position of the car when the accessory power is off;
When the vehicle key position is OFF, the driving of the on-vehicle device being driven is stopped, and when the vehicle key position is other than OFF, the on-vehicle device having the third step of maintaining the driving state of the driving on-vehicle device is Control method.   5. The method of controlling an in-vehicle device according to claim 4, wherein when the key position of the vehicle is OFF, the driving of the driving in-vehicle device is stopped, and when the key position of the vehicle is other than OFF. The step of monitoring the voltage drop of the battery power supply, stopping the driving of the on-vehicle device being driven when the voltage drop is detected, and maintaining the driving state of the driving on-vehicle device when the voltage drop is not detected. The method for controlling an in-vehicle device according to claim 4.   6. The method of controlling an in-vehicle device according to claim 5, wherein when the voltage drop of the battery power source continues for a certain period, the voltage drop of the battery power source is detected.

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