JP2001322512A - Vehicular dark current reducing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent flowing of dark current in a battery causing wasteful consumption of electric power due to feeding of a +B power source of a vehicle to an apparatus even after turning off an ACC power source and finishing a post process of a deck mechanism part by microcomputer control. SOLUTION: An ACC power source control part 10 provided as a vehicle side device outputs the ACC power source after delaying it a certain time when the ACC power source of the vehicle is turned off and outputs an ACC power source OFF signal (a) to a microcomputer part 14. The microcomputer part 14 stores data stored in an internal memory into an EEPROM 17 within the certain time and finishes the necessary post-processing of the deck mechanism part 13. Since only the ACC power source is used without using the +B power source of the vehicle and the ACC power source is shut off after performing the necessary post-processing, the battery dark current during nonuse of the electric apparatus can be reduced to zero for preventing wasteful consumption of the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for reducing a dark current of a battery in a vehicle electronic device such as a car audio device, an audio video device, and a navigation device.

[0002]

2. Description of the Related Art A power supply for a vehicle electronic device using a battery includes a + B power supply directly supplied from a battery and an ACC which can be used when an accessory switch is turned on so as to be compatible with various vehicle electronic devices. Two power supplies, a power supply and a power supply, are provided. FIG. 4 shows an audio head unit (H) in a conventional car audio device.
/ U). The power supply unit 2 of the audio head unit 1 receives a + B power supply of the vehicle and supplies a necessary voltage to a deck mechanism unit 3 and a microcomputer unit 4 which are power mechanism units such as a CD drive device. The + B power is also supplied to a power unit 5 that supplies power to an audio amplifier circuit of the car audio device. + B power supply of vehicle and A
The on / off state of the CC power supply is detected by the power supply detection unit 6. The microcomputer unit 4 is supplied with a necessary voltage from the power supply unit 2 and performs post-processing for returning the deck mechanism unit 3 to the initial state when the power detection unit 6 detects + B power off. When the power supply detection unit 6 detects that the ACC power supply has been turned off, the audio head unit 1 enters a non-operation state and enters a standby state.

Next, the operation of the audio head unit 1 will be described with reference to FIG. In the timing chart of FIG. 5, the + B power supply of the vehicle indicates a state from when the battery is connected to when the battery is removed. When the + B power supply of the vehicle is turned on, the + B power supply in the audio head unit (H / U) 1 is also turned on, whereby the power supply unit 2 is turned on, and the microcomputer unit 4 and the power unit 5 are turned on. Here, when the ACC power supply of the vehicle is turned on and the power supply detection unit 6 in the audio head unit 1 detects that the ACC power supply is turned on, the microcomputer unit 4 performs standby control of the power unit 5 based on the signal. In this state, when the power switch of the audio device is turned on,
The audio amplifier circuit operates to receive radio broadcasts and
D, reproduction of a cassette tape or the like is performed. Thereafter, when the power supply detecting section 6 detects that the ACC power supply of the vehicle is turned off, the microcomputer section 4 sets the audio amplifier circuit to a non-operating state. After the post-processing for restoring the initial state is performed, the microcomputer itself executes the end processing. This post-processing is always executed when the + B power supply is turned off, but is not executed when the deck mechanical unit 3 is not used at all.

[0004]

However, in the conventional audio head unit 1 described above, the A
Even after the CC power supply is turned off and the microcomputer unit 4 deactivates the circuit unit of the audio device, the + B power supply of the vehicle remains connected, so that current flows through the audio head unit 1 and the battery Power is wasted.

The present invention solves such a conventional problem and provides a vehicle dark current reduction method and apparatus capable of suppressing the dark current of a battery when an electronic device is not used.

[0006]

According to the present invention, there is provided a method for reducing dark current for a vehicle, comprising the steps of:
When the C power supply is turned off, the ACC power supply is delayed for a predetermined time on the vehicle side and output to the electronic device, and the electronic device side receives the electronic control signal within the predetermined time based on the ACC power supply off signal. It is characterized by performing necessary post-processing in the equipment, using only the ACC power supply without using the + B power supply of the vehicle, and shutting off the ACC power supply after performing the necessary post-processing. As a result, wasteful consumption of battery power can be prevented.

[0007] Further, a dark current reducing device for a vehicle according to the present invention includes:
An ACC power control unit provided on the vehicle side for outputting the ACC power supply with a delay for a predetermined time when the ACC power supply of the vehicle is turned off, and outputting an ACC power off signal; and an electronic device mounted on the vehicle. A power supply unit for supplying a predetermined power supply voltage to a power mechanism unit and a microcomputer unit of the electronic device based on an ACC power supply from the ACC power supply control unit; and An ACC power detection unit for starting the microcomputer unit, wherein the microcomputer unit receives an A / C signal from the ACC power control unit.
The data stored in the internal memory is written to another memory in response to the CC power-off signal, and the post-processing required by the power mechanism is executed during the predetermined time. According to this configuration, only the ACC power supply is used without using the + B power supply directly connected to the battery as the power supply of the vehicle electronic device, and the ACC power supply is turned off after the ACC power supply is turned off.
Since the output of the power supply is delayed for a certain period of time and necessary post-processing of the power mechanism is performed during that time, wasteful consumption of battery power can be prevented.

[0008] Further, a dark current reducing device for a vehicle according to the present invention includes:
A plurality of electronic devices are connected to a stage subsequent to the ACC power control unit. Since the plurality of electronic devices are controlled in a similar manner, the consumption of battery power of the entire vehicle electronic system is reduced. You can do it.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a configuration of a dark current reducing device for a vehicle according to an embodiment of the present invention. The description will be made by taking an audio head unit of a car audio device as an example similarly to a conventional example. In FIG. 1, an ACC power supply control unit 10 provided as a vehicle-side device
When the power supply is turned off, the ACC power supply is output with a delay for a predetermined time, and the ACC power supply off signal a is output. The power supply unit 12 of the audio head unit 11 supplies a predetermined voltage to a deck mechanism unit 13 and a microcomputer unit 14 which are power mechanisms of the car audio device, based on the ACC power from the ACC power control unit 10. A power unit 15 composed of a power IC for supplying power to an audio amplifier circuit of the car audio device is provided with an ACC from the ACC power control unit 10.
While being supplied with power, the microcomputer unit 14 performs standby control. The power detector 16 is activated by the ACC voltage from the ACC power controller 10 and supplies the ACC power-on signal b to the microcomputer 14. Microcomputer part 1
4 is an ACC power-off signal a from the ACC power control unit 10.
Is input, the work data and setting data stored in the internal RAM are written into the EEPROM 17 for backup for a certain period of time set by the ACC power supply control unit 10, and the Execute post-processing. Instead of the EEPROM 17, another non-volatile memory can be used, or a volatile memory of a type that is stored and held by a dedicated battery can be used. The old battery (+ B) connection device 18 of the ACC drive type is connected to the subsequent stage of the ACC power control unit 10, and one or more devices can be connected.

Next, the operation of the present embodiment will be described with reference to the timing chart of FIG. 2 and the flowchart of FIG. In the present embodiment, even when the + B power supply of the vehicle is turned on, the power is not supplied to the audio head unit 11. In FIG. 3, first, when the ACC power supply of the vehicle is turned on and supplied to the audio head unit 11,
While the ACC power is supplied to the power unit 15, the power supply unit 12 supplies necessary voltages to the deck mechanism unit 13 and the microcomputer unit 14 (step S1). Microcomputer section 14
Is an ACC power-on signal b from the ACC power detector 16
Thus, the power unit 15 to which the ACC power is supplied is subjected to standby control (step S2). Here, the audio device is used for a certain period of time, during which time power is supplied from the power unit 15 to the audio amplifier circuit, and reception of a radio broadcast, reproduction of a CD, and the like are performed (step S3). Thereafter, when the ACC power supply is turned off, the ACC power supply control unit 10
Delays the output of the ACC power supply for a certain period of time (for example, one minute) to make each unit of the audio head unit 11 operable. When the ACC power supply control unit 10 receives the ACC power supply off signal a from the ACC power supply control unit 10, the microcomputer unit 14 transmits the work data and setting data held in the internal memory to the EEPROM.
After writing into M17, and performing post-processing for returning the deck mechanical section 13 to the initial state within a predetermined time set by the ACC power control section 10, the processing is terminated (step S5). Note that the time required for post-processing of the deck mechanism 13 depends on the state in which the deck mechanism 13 is stopped.
If the audio device is not used at all when the CC power is turned on, the post-processing becomes unnecessary.

Next, when the ACC power supply is turned on again, each part of the audio head unit 11 is turned on, and the power supply detection section 16 detects that the ACC power supply is on. Supply,
Thereafter, the same operation is performed. Note that the power detection unit 16
In order to detect the C power-on, an IC of a type that self-recovers by the ACC voltage and detects the ACC power-on is used as the power detection unit 16.

As described above, according to the present embodiment, when the ACC power supply of the vehicle is turned off, the ACC power supply control unit 10 provided as the vehicle-side device outputs the ACC power supply with a delay for a predetermined time and outputs the ACC power. A power-off signal a is output to the microcomputer unit 14, and the microcomputer unit 14 stores the data held in the internal memory in the EEPROM 17 within the predetermined time.
And the necessary post-processing of the deck mechanism unit 13 is completed, so that when the car audio device is not used, the dark current of the battery can be reduced to zero, and wasteful consumption of battery power can be prevented. .

Although the above embodiment is an example in which the present invention is applied to a car audio device, the present invention uses another ACC power supply and requires post-processing when the ACC power supply is turned off. The present invention is also applicable to vehicle electronic devices. In addition, since a plurality of electronic devices connected downstream of the ACC power control unit 10 can all be controlled similarly, the effect of reducing the battery power of the vehicle electronic system as a whole is great.

[0014]

As described above, according to the present invention, when the ACC power supplied to the vehicle electronic device is turned off,
The ACC power supply is output to the electronic device after being delayed for a certain time, and the electronic device side performs necessary post-processing in the electronic device within the above-mentioned fixed time based on the OFF signal of the ACC power supply. Since only the ACC power supply is used without using the + B power supply of the vehicle and the necessary post-processing is performed, the ACC power supply is shut off, so that wasteful consumption of battery power can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an audio head unit according to an embodiment of the present invention.

FIG. 2 is a timing chart showing an operation of the audio head unit according to the embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of the audio head unit according to the embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an audio head unit in a conventional example.

FIG. 5 is a timing chart showing an operation of an audio head unit in a conventional example.

[Explanation of symbols]

 Reference Signs List 10 ACC power control unit on vehicle side 11 Audio head unit 12 Power supply unit 13 Deck mechanism unit 14 Microcomputer unit 15 Power unit 16 Power supply detection unit 17 EEPROM 18 Old battery (+ B) connection device

Claims (3)

[Claims] When an ACC power supply of a vehicle supplied to a vehicular electronic device is turned off, the ACC on the vehicle side is provided.
A power supply is output to the electronic device with a delay of a predetermined time, and the electronic device performs necessary post-processing in the electronic device within the predetermined time based on an off signal of the ACC power supply. Dark current reduction method for vehicles. 2. An ACC that is provided on a vehicle side and outputs the ACC power supply with a delay for a predetermined time when the ACC power supply of the vehicle is turned off, and outputs an ACC power supply off signal.
A power supply control unit, which is provided on an electronic device mounted on the vehicle and supplies a predetermined power supply voltage to a power mechanism unit and a microcomputer unit of the electronic device based on ACC power from the ACC power control unit. A power supply unit; and an ACC power supply detection unit that detects the turning on of the ACC power supply and activates the microcomputer unit. The microcomputer unit stores the ACC power supply in an internal memory in response to an ACC power supply off signal from the ACC power supply control unit. And writing the data to another memory and causing the power mechanism to execute necessary post-processing during the fixed time. 3. The vehicle double dark current reduction device according to claim 2, wherein a plurality of electronic devices are connected at a stage subsequent to the ACC power control unit.