JP4694195B2 - In-vehicle electronic device and control method for in-vehicle electronic device - Google Patents

Description

  The present invention relates to a technology of an in-vehicle electronic device whose main body is mounted on a vehicle.

  Conventionally, when an accessory switch is turned on, an on-vehicle electronic device configured to check an external device connected via a bus and to operate an external device selected by a user among the connected external devices A vehicle-mounted acoustic device is known (for example, see Patent Document 1).

Usually, in this type of in-vehicle electronic device, a plurality of external devices (CD (Compact Disc) changer device, DVD (Digital Versatile Disk) changer device, etc.) can be connected to the main body, and a tuner unit or the like can be connected to the main body. Generally equipped with internal equipment.
Japanese Patent Publication No. 5-46734

  By the way, in the above-mentioned in-vehicle electronic device, the user must select which device to operate every time the power is turned on, and the user's usability is low. A device configured to operate a device or an external device can be considered. However, in such a configuration, the internal device is not removed from the main body by the user, but the external device can be removed from the main body by the user, and thus the user removed the external device. When the power is turned on again in the state, there is a problem that the apparatus main body side causes an inconvenience of operating an external device that is not connected, and the control stability of the in-vehicle electronic device may be impaired.

  Therefore, the present invention has been made in view of the above-described circumstances, and is an in-vehicle electronic device that is user-friendly and can maintain control stability even when an external device is removed, and its control. It aims to provide a method.

In order to solve the above-described problems, the present invention includes a main body mounted on a vehicle, an external device configured to be connectable to the main body via a bus, and an external device connected to the main body via a bus, and A control unit for operating any one of the internal devices including at least the tuner unit installed in the main body, the control unit including an operation mode for operating the external device, and a tuner for operating the tuner unit. together and a mode storage unit and, after the power shutoff, a trigger that is turned again power mode stored in the storage means is the operation mode for storing the last mode was performed before power shutdown a first determining means for determining whether a result of the determination in the first determination means, when the mode stored in the storage means is in the operating mode, the dynamic A second determination means for an external device to determine whether or not it is connected to the main body corresponding to the mode, the result of the determination in the second determination means, external corresponding to the operation mode stored in said storage means If the equipment is connected to the main body, to perform the operation mode stored in the storage means, the external device corresponding to the operation mode stored in the storage unit Do is connected to the body In this case , a mode execution means for executing the tuner mode is provided .

In the in-vehicle electronic device, the control unit includes an operation mode for operating the external device and a standard mode for operating the internal device, and storage means for storing the last mode executed before power-off And a first determination means for determining whether the mode stored in the storage means is the operation mode, triggered by the power being turned on again after the power is turned off, and the first determination means As a result of the determination, when the mode stored in the storage means is the operation mode, the second determination means for determining whether or not an external device corresponding to the operation mode is connected to the main body, and the second If an external device corresponding to the operation mode stored in the storage unit is connected to the main body as a result of the determination by the determination unit, the operation mode stored in the storage unit Run, if the external device corresponding to the operation mode stored in the storage unit is not connected to the main body, is characterized in that a mode executing means for executing the normal mode.

In the in-vehicle electronic device, the control unit performs a system check for confirming whether or not an external device is connected to the main body immediately after power is turned on.
In the in-vehicle electronic device, the internal device is a device including a tuner circuit.
In the electronic on-vehicle apparatus, when a new external device is connected to the main body, a dedicated mode for operating the new external device is automatically added to the operation mode. It is.

In addition, a main body mounted on a vehicle is provided, and an external device can be connected to the main body via a bus. An external device connected to the main body via a bus and at least a tuner unit mounted on the main body. In the control method of the in-vehicle electronic device that operates any of the included internal devices, the method includes an operation mode for operating the external device and a tuner mode for operating the tuner unit, and is executed before power-off storing the last mode, after power-off, as a trigger that has been turned again supply, the storage means is stored in the mode determined whether the operation mode, the result of the determination, the storage If the mode stored in the unit is the operation mode, the external device corresponding to the operation mode to determine whether or not it is connected to the main body 1 And step of determining the first step result, when the external device corresponding to the operation mode stored in the storage means is connected to said body, said operation mode stored in said storage means If the external device corresponding to the operation mode stored in the storage unit is not connected to the main body as a result of the second step to be executed and the determination in the first step, the tuner mode is executed . And 3 steps.

  In addition, a main body mounted on a vehicle is provided, and an external device can be connected to the main body via a bus. Among the external devices connected to the main body via the bus and the internal devices mounted on the main body In a control program for controlling an in-vehicle electronic device that operates any device by a computer, the device that was operating immediately before power-off is an external device, and when power is turned on again after power-off, If it is determined whether an external device that was operating immediately before power-off is connected to the main body, and the result of this determination is that an external device that was operating immediately before power-off is connected to the main body, The external device is operated, and the internal device is operated when the external device that was operated immediately before the power supply is disconnected is not connected to the main body.

  According to the present invention, since the device immediately before power-off is operated, the convenience of the user is good, and even when the external device is removed from the main body, the internal device is operated, so that the stability of control can be maintained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a car audio device 1 as an in-vehicle acoustic device which is an aspect of the in-vehicle electronic device according to the present embodiment, and FIG. 2 is a front view of the device main body 2 of the car audio device 1. As shown in FIG. 1, a detachable control panel (hereinafter referred to as DCP (Detachable Control Panel) 3) 3 is detachably attached to the front surface (front portion) of the car audio device 1.

  The DCP 3 functions as a display unit and an operation unit of the car audio apparatus 1, and is provided on the left and right sides of the DCP case 4, the liquid crystal panel 5, the touch panel 6 provided on the liquid crystal panel 5, and the liquid crystal panel 5. It has a plurality of operation keys 7 arranged. Upper and lower edges of the liquid crystal panel 5 are provided with an upper frame 8A and a lower frame 8B, and the liquid crystal panel 5 is sandwiched between the upper frame 8A and the lower frame 8B. Further, four recesses 9 are formed at substantially equal intervals along the portion adjacent to the liquid crystal panel 5 in the lower frame 8B. These recesses 9 are used to guide operation locations on the touch panel 6. That is, as shown in FIG. 1, on the liquid crystal panel 5, four operation button icons 10 are displayed corresponding to these four recesses 9, and if the user slides his / her finger on the lower frame 8 </ b> B, The position of the operation button 10 displayed on the liquid crystal panel 5 can be observed from the position of the recess 9. Therefore, the user can easily operate the touch panel 6 without looking at the liquid crystal panel 5.

  Further, as shown in FIG. 1, guide pieces 11 extending vertically are provided on both the left and right edges of the liquid crystal panel 5. These guide pieces 11 are for guiding the operation location on the touch panel 6 in the same manner as the concave portion 9 of the lower frame 8B. Specifically, as shown in FIG. 1, scroll operation icons 12 for sequentially changing display items displayed on the liquid crystal screen 5 are displayed near the left and right edges of the liquid crystal panel 5. Can operate the scroll operation icon 12 by relying on the guide piece 11. That is, when the user slides on the touch panel 6 with the finger along the guide piece 11, the scroll operation icon 12 is operated, and the display items are sequentially changed.

  As described above, the DCP 3 includes a plurality of operation keys 7. As these operation keys 7, a power / volume key 7A, a source button 7B, an open / eject button 7C, an adjust button 7D, a mode button 7E, a sound A button 7F and an ISR button 7G are provided. The power / volume key 7A is configured as a rotary key switch, the power is turned on / off by a pressing operation, and the volume (volume) is adjusted by a rotating operation. The source button 7B is a push button for switching the sound source, and the sound source to be reproduced is switched each time the button is pressed. As a sound source, it is possible to communicate with a radio sound source (tuner unit 110 in FIG. 5) or a CD sound source (CD playback unit 120 in FIG. 5), which is an internal sound source as an internal device incorporated in the device main body 2, or the device main body 2. External audio input from a CD changer device 171 (FIG. 5) or a DVD changer device 172 (FIG. 5), which is an external sound source as an external device connected to the PC, is used. In the present embodiment, the apparatus main body 2 is configured so that a plurality of external sound source sources as external devices can be connected via a bus.

  The open / eject button 7C is a push button for opening the DCP3 panel. When the open / eject button 7C is pressed in a state where the DCP 3 is closed, the DCP 3 is pushed out of the apparatus main body 2 by a link mechanism (not shown). The device body 2 is opened and the front surface (front portion) of the apparatus main body 2 is exposed. As shown in FIG. 2, a CD insertion slot 20 is provided in the front of the apparatus main body 2, and the CD can be inserted into and removed from the apparatus main body 2 by opening the DCP 3. When the open / eject button 7C is operated with the DCP 3 opened, the CD is ejected from the insertion slot 20.

  The adjustment button 7D is an operation button used when various settings and adjustments of the apparatus main body 2 are performed. The mode button 7E is, for example, a push button for setting a playback mode at the time of CD playback. Each time the button is pressed, a playback mode such as repeat playback or random playback is switched and set. When the mode button 7E is pressed for a long time, the display on the liquid crystal panel 5 is switched between the standard display and the simple display that improves the visibility by omitting the design. The sound button 7F is an operation button used when performing various settings and adjustments related to sound. The ISR button 7G is an operation button for receiving a specific radio channel and outputting radio sound regardless of the current selection state of the sound source.

  In addition, a light receiving window 13 of a photosensor for sensing the brightness of the passenger compartment and a light receiving window 14 for receiving a signal from a remote controller are provided in front of the DCP 3. In the car audio apparatus 1, the brightness of the backlight of the liquid crystal panel 5 is adjusted according to the brightness of the passenger compartment sensed by the photosensor (so-called auto dimmer function).

  As described above, the DCP 3 can be detached from the apparatus main body 2. The structure of the DCP 3 will be described below. As shown in FIG. 3, two engagement protrusions 30A, 30B and one An engagement receiver 31 and a connector contact 32 are formed. As shown in FIG. 2, a support plate 21 for attaching the DCP 3 is provided on the front surface of the apparatus body 2, and this support plate is provided. Two engagement receivers 22 </ b> A and 22 </ b> B, one engagement protrusion 23, and a connector contact 24 are formed on 21. Under this configuration, the engagement receiver 31 on the back surface of the DCP 3 is pushed into the engagement protrusion 23 on the support plate 21 of the apparatus main body 2, and one end side of the DCP 3 is engaged with the apparatus main body 2. The DCP 3 is detachably attached to the front surface of the apparatus main body 2 by pushing the engagement protrusions 30A and 30B and the connector contact 32 into the engagement receivers 22A and 22B and the connector contact 24 of the apparatus main body 2 respectively.

  When the DCP 3 is attached to the apparatus main body 2, signals can be transmitted and received between the DCP 3 and the apparatus main body 2 via the connector contacts 32 and 24, and between these DCP 3 and the apparatus main body 2. An operation signal corresponding to the operation of the operation key 7, a signal for displaying various information on the liquid crystal panel 5, and the like are transmitted and received.

  FIG. 4 is a rear view of the apparatus main body 2. As shown in FIG. 4, an RCA connector 26 to which an external amplifier unit is connected and an external device such as a CD changer device 171 (FIG. 5) or a DVD changer device 172 (FIG. 5) are provided on the rear surface of the apparatus main body 2. The external sound source is connected to the bus terminal 27 via a bus.

  Next, the functional configuration of the car audio device 1 will be described in detail with reference to FIG. FIG. 5 is a block diagram showing a functional configuration of the device main body 2 and the DCP 3 of the car audio device 1. As shown in this figure, the device body 2 of the car audio device 1 includes a master microcomputer 100, a tuner unit 110, a CD playback unit 120, an audio output unit 130, and an interface 140. In addition, an external device can be connected to the apparatus main body 2 via the bus 27a to the bus terminal 27. In FIG. 5, a CD changer device 171 and a DVD changer device 172 are connected.

  The master microcomputer 100 includes a CPU 100a and executes control of each unit of the apparatus main body 2 and the DCP 3, and further includes an EEPROM 100b and a RAM 100c (storage means). The EEPROM 100b includes a control program, a menu screen, and the like. The various display data are stored. The master microcomputer 100 is supplied with a backup power supply 141 directly connected to the vehicle battery and an ACC power supply 143 connected to the battery via the key switch 142. Therefore, while the ACC power supply 143 is off, the backup power supply 141 is supplied to the master microcomputer 100, and the data stored in the RAM 100c or the like is retained.

  That is, the backup power supply 141 is supplied only to the master microcomputer 100 and is supplied to other devices (DCP3, tuner unit 110, CD playback unit 120, audio output unit 130, CD changer device 171 and DVD changer device 172 as external devices). Is not supplied. That is, when the ACC power supply 143 is turned on, the device main body 2 and the CD changer device 171 and the DVD changer device 172 as external devices become operable, and when the ACC power supply 143 is shut off, the device main body 2 and the external device The CD changer device 171 and the DVD changer device 172 are stopped.

  In the EEPROM 100b, data of all external devices connectable to the apparatus main body 2, that is, confirmation commands corresponding to the respective external devices connectable to the apparatus main body 2 are stored in advance. The data of the confirmation command stored in the EEPROM 100b can be updated. For example, the data is read from a CD-ROM inserted in the CD reproducing unit 120, or the data is downloaded from a computer (not shown) or the like. Can be updated.

  The tuner unit 110 receives an AM / FM wave radio broadcast, and includes an antenna 111 and a tuner circuit 112. The tuner circuit 112 receives a radio broadcast of a predetermined channel based on an instruction from the master microcomputer 100. The audio signal is output to the audio output unit 130. The CD playback unit 120 includes a CD reading unit 121 that reads music data recorded on a CD and outputs an audio signal to the audio output unit 130 under the control of the master microcomputer 100.

  The audio output unit 130 outputs audio based on audio signals from each of the tuner unit 110 and the like and the CD reproduction unit 120 under the control of the master microcomputer 100, and includes a DSP (Digital Signal Processor) 131, a volume And an electronic volume circuit 132 for adjusting. Under the control of the master microcomputer 100, the DSP 131 performs digital audio signal processing such as filter processing, equalizer processing, and decoding processing when the audio signal is encoded on the electronic volume circuit 132. The electronic volume circuit 132 adjusts and outputs the amplitude level of the audio signal after D / A conversion of the audio signal in order to adjust the reproduction volume under the control of the master microcomputer 100. In addition to the tuner unit 110 and the CD playback unit 120, the DSP 131 is configured to be able to input an external audio signal from an external device such as a CD changer device 171 or a DVD changer device 172 via the interface 140. .

  Here, for example, an external amplifier unit 160 is connected to the car audio apparatus 1 via an RCA connector 26 formed of, for example, a two-wire coaxial cable, and an audio signal output from the electronic volume circuit 132 is transmitted to the RCA connector 26. To the external amplifier unit 160. The external amplifier unit 160 is configured so that a plurality of speakers SP can be connected, and includes an amplifier circuit (not shown) of only the maximum number of speakers SP that can be connected (six in this embodiment), and the electronic volume circuit 132. Is amplified and output to each speaker SP currently connected. Of course, an amplifier circuit and a speaker may be incorporated in the apparatus main body 2 so that sound can be output without using the external amplifier unit 160.

  As described above, the DCP 3 includes the liquid crystal panel 5, the touch panel 6, and the operation keys 7, and further includes a display microcomputer 151 that controls each part of the DCP 3, and various types of liquid crystal panel 5 based on instructions from the display microcomputer 151. And an LCD driver 152 for displaying information. When the DCP 3 is mounted on the apparatus main body 2, the display microcomputer 151 of the DCP 3 and the master microcomputer 100 of the apparatus main body 2 are electrically connected by the connector contacts 24 and 32 to exchange various signals. For example, when the power / volume key 7A (see FIG. 1), which is one of the operation keys 7, is rotated and the volume is adjusted by the user, the rotation operation amount is detected by an encoder (not shown) and displayed. The data is transmitted from the microcomputer 151 to the master microcomputer 100. As a result, the master microcomputer 100 controls the electronic volume circuit 132 so that the reproduction volume becomes a volume corresponding to the rotation operation amount of the power / volume key 7A.

  A resistive film type touch panel is used as the touch panel 6, and when a hand touches the surface, a voltage signal corresponding to the position coordinates of the contact point is output to the display microcomputer 151, and the display microcomputer is based on the signal. The contact point coordinates are specified by 151. Thereby, it is identified which operation button displayed on the liquid crystal panel 5 is operated, and an operation corresponding to the operation is executed.

  In this embodiment, immediately after the ACC power supply 143 is turned on by the key switch 142 or when a request command is received from the external device 171 (or 172) connected so as to be communicable, the master microcomputer 100 displays the device main body 2. A system check is executed to confirm whether or not the external devices 171 and 172 are communicably connected via the bus 27a. That is, the master microcomputer 100 performs a system check every time the ACC power supply 143 is turned on.

  FIG. 6 is a sequence diagram showing an operation during a system check. Referring to FIG. 6, first, the CPU 100a of the master microcomputer 100 sends a confirmation command recognized only by the CD changer device 171 to the bus 27a as a system check (S1). The CD changer device 171 that has received this confirmation command sends a response command to the bus 27a within a predetermined time (S2). The CPU 100a of the master microcomputer 100 receives this response command, and determines that the CD changer device 171 is communicably connected (S3).

  Next, the CPU 100a of the master microcomputer 100 confirms the DVD changer device 172 by outputting a confirmation command recognized only by the DVD changer device 172 to the bus 27a as in the confirmation operation of the CD changer device 171.

  That is, the CPU 100a of the master microcomputer 100 sequentially sends out all the confirmation commands stored in the EEPROM 100b.

  Here, if the CPU 100a of the master microcomputer 100 does not receive a response command even after a predetermined time has passed after sending the confirmation command, the external device 171 (or 172) corresponding to this confirmation command is the main body of the apparatus. 2 is determined not to be communicably connected. As described above, when the external devices 171 and 172 are not actually connected to the bus 27a or the power switch (not shown) provided in the external devices 171 and 172 is turned off as the case where the communication is not possible. This is the case.

  After performing the system check in this manner, the master microcomputer 100 sets the CD changer device 171 or the DVD changer device 172 that are communicably connected to the apparatus main body 2 by the source button 7B of the operation key 7 so as to be selectable. To do.

  In other words, the tuner mode (standard mode) for operating the tuner unit 110, which is an internal sound source as an internal device, and the CD mode for operating the CD playback unit 120 can be selected by the source button 7B (FIG. 1). Further, by the system check, the CD changer operation mode (operation mode) for operating the CD changer device 171 and the DVD changer operation mode (operation mode) for operating the DVD changer device 172 can be selected by the source button 7B (FIG. 1). Configured. That is, every time the source button 7B is operated, the tuner mode, the CD mode, the CD changer operation mode or the DVD changer operation mode is selected cyclically. Thereby, the master microcomputer 100 executes the mode selected by the source button 7B (FIG. 1).

  In the present embodiment, the CPU 100a of the master microcomputer 100 stores the mode currently selected by the source button 7B in the RAM 100c. For example, when the vehicle is stopped and the engine is stopped, the key switch 142 is turned off by the user. Even when the key switch 142 is turned off and the ACC power supply 143 is shut off, the backup power supply 141 is used. The contents of the RAM 100c are retained. That is, the RAM 100c stores a mode immediately before the power is turned off.

Next, the case where the ACC power supply 143 is turned on again will be described.
FIG. 7 is a flowchart showing a control operation of the master microcomputer 100 as a control unit immediately after the ACC power supply 143 is turned on.

  First, the CPU 100a of the master microcomputer 100 performs the above-described system check (step ST1). Next, the CPU 100a of the master microcomputer 100 determines whether or not the mode stored in the RAM 100c is a mode for operating the external device 171 (or 172) (step ST2). That is, the CPU 100a determines whether the mode stored in the RAM 100c is the CD changer operation mode or the DVD changer operation mode.

  When the mode stored in the RAM 100c is a mode for operating the external device 171 (or 172) (ST2; Yes), the CPU 100a, the external device 171 (or 172) corresponding to the mode stored in the RAM 100c. Is determined to be communicably connected to the apparatus main body 2 (step ST3).

  For example, when the mode stored in the RAM 100c is a CD changer operation mode in which the CD changer device 171 is operated, the CPU 100a determines whether or not the CD changer device 171 is communicably connected to the apparatus main body 2. To do.

  As a result of the determination in step S3, when the external device 171 (or 172) corresponding to the mode stored in the RAM 100c is communicably connected to the apparatus main body 2 (step ST3; Yes), the CPU 100a determines that the RAM 100c The mode stored in is executed (step ST4).

  For example, when the CD changer device 171 corresponding to the CD changer operation mode stored in the RAM 100c is communicably connected to the device main body 2, the CPU 100a sets the CD changer operation mode for operating the CD changer device 171. Execute.

  Next, in step ST2, when the mode stored in the RAM 100c is not a mode for operating the external device 171 (or 172) (step ST2; No), that is, the mode stored in the RAM 100c is the tuner mode or In the case of the CD mode, these modes are modes in which the tuner unit 110 or the CD playback unit 120 as an internal device equipped in the apparatus main body 2 is operated. Therefore, the CPU 100a performs the process of step ST4, that is, the RAM 100c. The tuner mode or the CD mode stored in the memory is executed.

  In step ST3, when the external device 171 (or 172) corresponding to the mode stored in the RAM 100c is not communicably connected to the apparatus main body 2 (step ST3; No), for example, the RAM 100c includes a CD. If the changer operation mode is stored, but the CD changer device 171 corresponding to this CD changer operation mode is not communicably connected to the device main body 2, it is possible to operate the CD changer device 171 as the external device. Can not. Therefore, in this embodiment, in this case (step ST3; No), the CPU 100a executes a tuner mode that is a standard mode (step ST5).

  In other words, the CD changer device 171 operated immediately before the ACC power supply 143 is cut off is the CD changer device 171. When the ACC power supply 143 is turned on again after the power supply is cut off, the CD changer device 171 operated before the power cut off is the device. If the CD changer device 171 is operated if it is communicably connected to the main body 2, and the CD changer device 171 that was operated before the ACC power supply 143 is shut off is removed from the main body 2, the tuner unit 110 is turned on. It is what makes it work.

  Therefore, according to the present embodiment, the device that was operating immediately before the ACC power supply 143 is shut off is configured to operate when the ACC power supply 143 is turned on next time, so the user has to operate the source button 7B. There is no. That is, even if the source button 7B is not operated, the device that has been operated immediately before the ACC power supply 143 is shut off can be put into an operating state. Thereby, a user's effort is saved and a user's usability improves.

  Furthermore, according to the present embodiment, when the external device 171 (or 172) corresponding to the mode stored in the RAM 100c is removed from the apparatus main body 2, the tuner unit 110 is turned on immediately after the ACC power supply 143 is turned on. Since it is configured to automatically switch to the tuner mode to be operated, there is no need for the user to manually switch the source button 7B, the user's trouble is saved, the usability of the user is improved, and the master microcomputer 100 is Since the control for operating the removed external device 171 (172) is not performed, the stability of the control can be maintained.

  Here, as shown in FIG. 8, when a car navigation apparatus 173 as an external device is newly connected to the bus terminal 27 of the apparatus body 2 via the bus 27a so as to be communicable, for example, the ACC power supply 143 is turned on. When the car navigation device 173 is connected to the bus 27a while the power switch of the car navigation device 173 is turned on, the car navigation device 173 sends a request command indicating new entry to the bus 27a. Send it out. The master microcomputer 100 that has received this request command performs the system check described above. Thus, when the car navigation operation mode for operating the car navigation device 173 is added to the operation mode for operating the external device, and the car navigation operation mode is selected by the source button 7B (FIG. 1), the device main body 2 An audio signal is received from the device 173. As described above, when an external device is added, the setting is performed automatically, saving the user's trouble and improving the user's usability.

  The embodiment described above shows one aspect of the present invention, and does not limit the present invention, and can be arbitrarily changed within the scope of the present invention. Furthermore, the configuration shown in the embodiment is not limited thereto, and can be appropriately changed without departing from the gist of the present invention.

  For example, in the above-described embodiment, the case where the control program is stored in advance in the EEPROM 100b of the master microcomputer 100 has been described. However, the control program can be read by a computer such as a magnetic recording medium, an optical recording medium, or a semiconductor recording medium. It may be stored in a recording medium, and the computer may read the control program from the recording medium and execute it. The control program may be downloaded from a distribution server on the communication network.

It is a front view of the vehicle-mounted electronic apparatus which concerns on this Embodiment. It is a front view of the apparatus main body of a vehicle-mounted electronic device. It is a rear view of a control panel. It is a rear view of the apparatus main body of a vehicle-mounted electronic device. It is a block diagram which shows the functional structure of the apparatus main body of a vehicle-mounted electronic device, and a control panel. It is a sequence diagram which shows the operation | movement at the time of a system check. It is a flowchart which shows the control action of a control part. It is explanatory drawing when an external apparatus is additionally connected.

Explanation of symbols

1 Car audio equipment (on-vehicle electronic equipment)
2 Main unit (main unit)
7B Source button 27 Bus terminal 27a Bus 100 Master microcomputer (control unit)
100c RAM (storage means)
110 Tuner (internal equipment)
143 ACC power supply
171 CD changer device (external equipment)
172 DVD changer device (external equipment)
173 Car navigation system (external equipment)

Claims (4)

It is equipped with a main body mounted on a vehicle, and is configured so that external devices can be connected to this main body via a bus.
Among external devices connected to the main body via a bus and internal devices including at least a tuner unit equipped in the main body, a control unit for operating any device,
This control unit
An operation mode for operating the external device and a tuner mode for operating the tuner unit;
Storage means for storing the last mode executed before power-off,
First judgment means for judging whether the mode stored in the storage means is the operation mode, triggered by the power being turned on again after the power is shut off ;
As a result of the determination by the first determination means, when the mode stored in the storage means is the operation mode , a second determination is made as to whether or not an external device corresponding to the operation mode is connected to the main body . Judgment means,
Results of the determination of the second determination means, when the external device corresponding to the operation mode stored in the storage unit that is connected to said main body, and performs the operation mode stored in said storage means , vehicle electronic device, characterized in that the external device corresponding to the operation mode stored in the storage unit may have not been connected to the main body, and a mode executing means for executing the tuner mode. The in-vehicle electronic device according to claim 1, wherein the control unit performs a system check for confirming whether an external device is connected to the main body immediately after power is turned on. The in-vehicle system according to claim 1 or 2 , wherein when a new external device is connected to the main body, a dedicated mode for operating the new external device is automatically added to the operation mode. Electronics. It is equipped with a main body mounted on a vehicle, and is configured so that external devices can be connected to this main body via a bus.
In the control method of the in-vehicle electronic device for operating any one of the external device connected to the main body via a bus and the internal device including at least the tuner unit equipped in the main body,
An operation mode for operating the external device and a tuner mode for operating the tuner unit;
Memorize the last mode executed before power off,
After the power is turned off, it is determined whether the mode stored in the storage means is the operation mode , triggered by the power being turned on again. As a result of the determination, the mode stored in the storage means Is a first step of determining whether or not an external device corresponding to the operation mode is connected to the main body,
As a result of the determination in the first step, when an external device corresponding to the operation mode stored in the storage unit is connected to the main body, the operation mode stored in the storage unit is executed . Step 3 and a third step of executing the tuner mode when an external device corresponding to the operation mode stored in the storage unit is not connected to the main body as a result of the determination of the first step. And a control method for an in-vehicle electronic device.

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