JPH11278171A - Electronic equipment for car mounting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To indicate no display for demonstration at the time of ordinary use of it by judging whether to carry out the display for demonstration in the states of starting a first electric power source means to supply an electric power source to each part of equipment at the time of the electric power source ON and of starting a second electric power source means to supply the electric power source to a part of the equipment at the normal time. SOLUTION: In the case when an electric power source BATT changes from OFF to ON and a super capacitor 14 is in a discharging state, equipment is made in a reset state, a memory content of a RAM built in a microcomputer 10 is cleared, and indication is transmitted from the microcomputer 10 to an operation panel 15 to carry out demonstrative display on a display part. On the other hand, in the case when the electric power source BATT changes from OFF to ON and the super capacitor 14 is in a charging state and in the case when the electric power source BATT maintains the ON state and the super capacitor 14 is in the charging state, the previous state of the equipment 1 at the time of the electric power source OFF which is memorized and held in the RAM built in the microcomputer 10 is read out and its state is reproduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-vehicle electronic device capable of displaying an image for display in a store, for example.

[0002]

2. Description of the Related Art In recent years, in electronic devices such as acoustic devices such as those mounted on a vehicle, a display mode for a display unit is defined as:
Apart from the display mode at the time of normal operation, many display devices have a display mode for display (hereinafter, referred to as a demo mode) for display when displayed at a store. In this demo mode, for example, a display having a flashy movement is performed. When a large number of electronic devices of the same type are displayed at a store, the display of the devices is set to the demo mode so that the device is differentiated from other models and the advertising effect is enhanced.

[0003] By the way, in a car-mounted electronic device, for example, a car stereo, in addition to a main power required for normal operation, a backup power is always supplied to maintain an internal memory. When the vehicle is mounted on a vehicle, the main power is supplied, for example, when an ignition switch is set to an ACC (accessory) position. By turning on the power switch of the device in this state, the device is started, and the display immediately before the power was last turned off is reproduced based on, for example, the storage in the backed up internal memory. When both the backup power supply and the main power supply are turned on, the device is reset, and the display is an initial screen such as a clock display.

In a car stereo or the like, when an ignition switch is operated to turn on a starter motor to start an engine, the power from a battery is instantaneously greatly reduced. At this time, the backup power supply is also cut off at the same time. For this measure, for example, a large-capacity power storage element (called a super capacitor) is used. Always keep the super capacitor charged
When the backup power is cut off, the supercapacitor is discharged to secure the backup of the memory and the like.

On the other hand, when such a vehicle-mounted device is displayed at a store, a main power supply and a backup power supply are often supplied in common. A large number of devices are supplied with a common power supply, and the common power supply is turned on / off so that a large number of devices can be controlled at once. If all the power switches of the connected devices are turned on, all the connected devices can be started up only by turning on the common power supply.

[0006]

In a conventional device, the display mode is switched to the demonstration mode by performing a predetermined operation on the device. As mentioned above, at the store, the main power supply and the backup power supply are ON / OF at the same time.
F. Therefore, when the power of the device is turned on, the device is in a reset state, for example, a clock display is displayed, and it is necessary to operate some button or switch in order to enter the demo mode. For example, the display mode changeover switch is kept pressed until the display becomes the demo mode display.

[0007] Since many similar devices of other manufacturers are usually displayed at a store, it is difficult to switch the display mode of the device to the demo mode by taking such a procedure.
There was a problem that it could not always be expected.

[0008] For example, there has been a situation in which most of the devices displayed at a store have a clock display all day. As described above, there is a problem that a conventional device cannot provide a sufficient storefront effect.

[0009] On the other hand, there has conventionally been a device that switches to the demo mode by a simpler method. For example, when the power switch is turned off during “PLAY”, the mode is switched to the demo mode. However, in this method, even in normal use, the demo mode is set by turning off the power switch,
There was a problem that it was very troublesome. For example, there is a problem that the demo display cannot be erased even when it is bright and noticeable at night, for example.

[0010] Therefore, an object of the present invention is to provide a vehicle-mounted electronic device that can easily display a demonstration screen when it is displayed in a store or the like, and does not display the demonstration screen in normal use. Is to provide.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a vehicle-mounted electronic device which is mounted on a vehicle and is supplied with power from a battery of a vehicle. A first power supply means for supplying power to a part of the device through power-on and power-off; a first power supply means and a second power supply means; And a display means for performing display for display only when both of them stand up.

As described above, the present invention provides a first power supply means for supplying power to each unit of a device when the power is turned on, and a second power supply means for always supplying power to a part of the device. In this state, it is determined whether display for display is to be performed. Therefore, display for display is not displayed during normal use, but is displayed only when both the first and second power supply units are started up.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. In the present invention, the backup power supply and A
The supply of the CC power (or the power by turning on / off the power switch) is monitored together, and when both power up at the same time, a display for display in a demonstration mode (hereinafter, referred to as a demonstration display) is performed. At this time, it is determined whether the backup power supply has started up after an instantaneous power cut-off such as when the engine is started, or whether the backup power supply has started up after a long-time power cut-off. Then, the above-described demonstration display is performed only when it is determined that the backup power supply has been turned on after a long-time power supply cutoff.

FIG. 1 shows an example of the configuration of a vehicle-mounted electronic device 1 to which the present invention can be applied. The in-vehicle electronic device 1 is, for example, a car stereo. In FIG. 1, parts related to the present invention are mainly shown, and for example, an audio signal processing unit is omitted.

The vehicle-mounted electronic device 1 is entirely controlled by a microcomputer 10 including, for example, a CPU, a RAM, and a ROM. The ROM incorporated in the microcomputer 10 stores in advance program data for controlling the device, display data to be displayed on a display unit described later, and the like. The RAM is used as a work area of the CPU, is stored and held by a backup power supply, and holds a state immediately before the power of the device 1 is turned off.

The operation panel 15 includes an operation unit for the user to operate the on-vehicle electronic device 1 and a display unit for displaying various states of the device 1. The display unit includes, for example, an LCD (Liquid Crystal Display) and a driving circuit, and performs display based on display data supplied from the microcomputer 10.

Various buttons, switches, dials, and the like are arranged on the operation unit, and corresponding control data is generated based on a user operation. This control data is supplied to the microcomputer 10. The microcomputer 10 controls each unit of the device 1 based on the control data. For example, the operation panel 15 is provided with a power switch for controlling ON / OFF of the power of the device 1.

Information indicating ON / OFF of an ACC switch of a vehicle on which the device 1 is mounted is supplied from a terminal 16. This information is supplied to the microcomputer 10. Based on the ON / OFF information of the power switch and the ACC switch, the supply of power by the main power regulator 12 is controlled by the microcomputer 10 as described later.

The terminal 11 is supplied with power BATT from a vehicle-mounted battery. The power supply BATT is supplied from a terminal 11 to a main power supply regulator 12 and a backup power supply regulator 13. Outputs of the main power supply regulator 12 and the backup power supply regulator 13 are supplied to the microcomputer 10 and also to the reset circuit 18.

The main power supply regulator 12 includes a microcomputer 10
And a regulator for supplying power to an operation panel 15 described later, an audio signal processing unit (not shown), and the like. For example, power is supplied stably at a voltage value of 5 V to the microcomputer 10 and the operation panel 15 and at 10 V to the audio signal processing unit.

The ON / OFF information of the ACC switch of the vehicle is supplied from a terminal 16 to the microcomputer 10. Under the control of the microcomputer 10, when the ACC switch is in the OFF state, the supply of power from the main power supply regulator 12 is stopped, and the device 1 is turned off. By operating the power switch disposed on the operation panel 15 described above, the supply of power by the main power regulator 12 is turned on / off under the control of the microcomputer 10.

On the other hand, the backup power regulator 13
Keeps supplying power while the terminal 11 is connected to the battery of the vehicle. Power is supplied from the backup power supply regulator 13 to the microcomputer 10 even while the ACC switch is in the OFF state. This allows
The storage of the RAM built in the microcomputer 10 is retained.

A super capacitor 14 is connected between the output paths of the main power supply regulator 12 and the backup power supply regulator 13 and the ground potential. The supercapacitor 14 has a capacitance of, for example, several farads,
The battery is charged while power is supplied from the regulators 12 and / or 13. Regulators 12 and 13
When the power supply is stopped from the
4 is started and supplied to the microcomputer 10 instead of the backup power supply.

The discharge voltage of the super capacitor 14 is constantly monitored by the microcomputer 10. When the discharge voltage is equal to or higher than a predetermined voltage value, it is determined that supercapacitor 14 is in a charged state.

A reset switch (not shown) is connected to the terminal 17, and a reset signal is supplied to a reset circuit 18 by operating the reset switch. The reset circuit 18 controls the microcomputer 10 based on the reset signal.
Of the built-in RAM, and of a mechanical unit (not shown). When the internal RAM of the microcomputer 10 is initialized, for example, the display on the display unit on the operation panel 15 is initialized.

According to the present invention, as described above, the power supply by the main power supply regulator 12 and the power supply by the backup power supply regulator 13 are monitored, so that the display unit of the operation panel 15 is automatically displayed. Demo display can be performed. More specifically, terminal 1
Whether the demonstration display is to be performed is determined by logically determining the state of the power supply BATT supplied from 1 and the state of charge / discharge of the super capacitor 14.

The state of the power supply BATT is (1) changed from OFF to ON and (2) maintained ON. There are these two states. If the OFF state is maintained, the device 1 is not activated, and thus is not taken into consideration. The state of the supercapacitor 14 includes (1) charging state and (2) discharging state.

In the combination of these states, the power supply BA
TT changes from OFF to ON, and supercapacitor 1
If 4 is in a discharged state, it can be considered that the supply of the backup power from the backup power regulator 13 has been interrupted for a long time. This corresponds to, for example, a case where the device 1 is displayed at a store and the power supply from the terminal 11 is interrupted from the closing time to the opening time.

On the other hand, if the power supply BATT changes from OFF to ON and the supercapacitor 14 is in a charged state, it can be considered that the supply of the backup power supply is interrupted for a short time. This corresponds to, for example, a case where the device 1 is mounted on a vehicle, a starter is turned on to start the engine, and the supply of power from the terminal 11 is temporarily stopped or the voltage drops temporarily.

When the power supply BATT is maintained in the ON state,
When the supercapacitor 14 is in a charged state, it is considered that the device 1 is mounted on a vehicle and used in a normal state. This is because, for example, A
This corresponds to a case where the CC power is turned on / off or the power is turned on / off by a power switch provided in the device 1.

It is impossible for the super capacitor 14 to be discharged while the power supply BATT is maintained in the ON state in a normal state.

Based on the above idea, according to the present invention, when the power supply BATT changes from OFF to ON and the supercapacitor 14 is discharged, the device is reset to clear the contents stored in the RAM built in the microcomputer 10. At the same time, from the microcomputer 10 to the operation panel 15,
An instruction is given to perform a demonstration display on the display unit.

On the other hand, when the power supply BATT changes from OFF to ON and the supercapacitor 14 is charged,
When the power supply BATT is maintained in the ON state and the supercapacitor 14 is in the charged state, the data is stored and held in the built-in RAM of the microcomputer 10.
The state of the device 1 when the power was last turned off is read, and the state is reproduced. For example, the display content of the display unit at the time of power-off stored in the previous RAM is read out by the microcomputer 10, and the microcomputer 10 supplies the display unit with
A display instruction is issued based on the read information.

The display contents in this case are not limited to this example. For example, an initial display screen such as a clock display may be displayed.

As described above, by using the present invention, when a vehicle-mounted electronic device is exhibited at a store, a demonstration display is automatically performed upon power-on, and
When used in a vehicle, the display at the previous power-off is reproduced when the power is turned on.

Each of the above-described states will be described more specifically with reference to FIGS. FIG. 2 shows an example in which the power supply BATT is maintained in the ON state and the supercapacitor 14 is in the charged state. When the power supply BATT is turned on from OFF to ON (Step S10), the charge / discharge state of the supercapacitor 14 is checked by the microcomputer 10, and when the supercapacitor 14 is in the discharge state (Step S11), the microcomputer 10 sends the signal to the reset circuit 18. In response, an instruction is issued to output a reset signal. A reset signal is supplied from the reset circuit 18 to each unit of the device 1, and the device 1 is reset (step S12). The reset signal clears the RAM in the microcomputer 10 (step S13).

Here, when the ignition switch is turned, the ACC power supply is turned on, and the ACC power supply is started (step S).
15) In step S14, a demonstration is displayed on the display unit of the operation panel 15 based on the control of the microcomputer 10.

FIG. 3 shows an example in which the power supply BATT is maintained in the ON state and the supercapacitor 14 is in the charged state. The device 1 is already mounted on a vehicle, for example, and the terminal 11 is connected to a battery of the vehicle. Therefore, power supply B
ATT has already been started and the ON state is maintained (step S20). The charge / discharge state of the supercapacitor 14 is checked by the microcomputer 10 and if the charge state is determined (step S21), the microcomputer 1
0 The stored contents of the built-in RAM are held (step S2
2).

Here, when the ignition switch is turned to start the engine (step S24), ACC
The power is turned on to start up (step S25). Then, in step S23, based on the control of the microcomputer 10,
The display section of the operation panel 15 is set to the clock display of the initial display. Note that this is not limited to this example, and step S23
Then, the display contents at the time of the previous power-off may be reproduced.

FIG. 4 shows an example in which the power supply BATT changes from OFF to ON and the supercapacitor 14 is charged. The device 1 is already mounted on a vehicle, for example, and the terminal 11 is connected to a battery of the vehicle. Therefore, the power supply BAT
T has already risen and the ON state is maintained (step S30). Charge of super capacitor 14 /
The discharge state is checked by the microcomputer 10 and is determined to be a charge state (step S31).

Here, the ignition switch is turned to start the engine (step S32). At this time, it is assumed that, for example, the vehicle-mounted battery is exhausted, and the supply of the power supply BATT from the terminal 11 is temporarily stopped (momentary interruption) (step S33). In step S31, it is determined that the supercapacitor 14 is in a charged state. Therefore, in the built-in RAM of the microcomputer 10, the stored contents are held using the discharge from the supercapacitor 14 as a backup power supply (step S34).

When the ACC power supply is turned on to start up (step S36), the display of the operation panel 15 is set to the initial clock display based on the control of the microcomputer 10 in step S35. Note that this is not limited to this example, and in step S35, the display content when the power was last turned off may be reproduced.

[0043]

As described above, according to the present invention, it is detected whether or not a demonstration display is to be performed by utilizing the difference in the characteristics of power-on between display at a store and use in a vehicle. At the store display, a demonstration display is automatically performed when the power of the device is turned on. Therefore, there is an effect that the demonstration display is performed without any troublesome operation.

Further, switching to the demonstration display according to the present invention can be performed only by changing the software without adding a switch for that purpose, so that a high storefront effect can be obtained with almost no increase in cost. effective.

Further, according to the present invention, since the check is performed in the state of the backup power supply and the demonstration is displayed,
There is an effect that the demonstration screen does not appear in a state where the vehicle is actually mounted on the vehicle, and there is no trouble.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of a configuration of a vehicle-mounted electronic device to which the present invention can be applied.

FIG. 2 is a diagram for explaining an example of processing according to the present invention;

FIG. 3 is a diagram for explaining an example of processing according to the present invention.

FIG. 4 is a diagram for explaining an example of processing according to the present invention;

[Explanation of symbols]

10: microcomputer, 11: terminal supplied with power from battery, 12: main power regulator, 13
... Backup power regulator, 14 ... Super capacitor, 15 ... Operation panel

Claims (2)

[Claims] 1. An on-vehicle electronic device which is mounted on a vehicle and is supplied with power from a battery of a vehicle, a first power supply means for supplying power to each part of the device when the power is turned on, Second power supply means for supplying power to a part of the device through power-off, and display for display only when both the first power supply means and the second power supply means start up. A vehicle-mounted electronic device, comprising: a display unit configured as described above. 2. The in-vehicle electronic device according to claim 1, further comprising: a large-capacity power storage means connected to said second power supply means, wherein a state of said second power supply means is changed to a state of said power storage means. An in-vehicle electronic device characterized by making a judgment by monitoring a charge and discharge state.