JP2001322513A - 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-processing of a deck mechanism part by microcomputer control. SOLUTION: A +B power source control part 10 provided as a vehicle side device outputs the +B power source after delaying it a certain time when a turning off of the ACC power source of the vehicle is detected. A power source detecting part 16 outputs an ACC power source OFF signal 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 the +B power source is cut off after performing the necessary post-processing the battery dark current can be reduced to zero during nonuse of the electric apparatus 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 required 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 detecting unit 6 detects that the ACC power supply is 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]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for reducing a dark current for a vehicle, the method comprising:
When the ACC power supply of the power supply and the ACC power supply is turned off, the vehicle outputs the + B power supply to the electronic device for a certain period of time, and the electronic device side outputs the + B power supply based on the ACC power supply off signal. In the electronic device, necessary post-processing is performed within a time period. After performing the necessary post-processing, the + B power supply is shut off, so that wasteful consumption of battery power can be prevented. Become.

[0007] Further, a dark current reducing device for a vehicle according to the present invention includes:
A + B power control unit provided on the vehicle side for supplying a + B power supply of the vehicle for a fixed time when the ACC power supply of the vehicle is turned off; and the + B power supply control provided on the electronic device mounted on the vehicle. A power supply section for supplying a predetermined power supply voltage to the power mechanism section and the microcomputer section of the electronic device based on the + B power supply from the section, and detecting ON / OFF of the ACC power supply and the + B power supply to output to the microcomputer section The microcomputer unit writes the data held in the internal memory to another memory according to the ACC power-off signal from the power detection unit, and sends the data to the power mechanism unit during the fixed time. It is characterized in that necessary post-processing is executed. With this configuration, after the ACC power supply is turned off, the + B power supply is supplied to the electronic device for a certain period of time, and during that time, the necessary data is stored in the nonvolatile memory, and the necessary post-processing of the power mechanism unit is performed. Since this is done, 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 the subsequent stage of the + B power control unit. Since the plurality of electronic devices are controlled in the same manner, the battery power consumption of the entire vehicle electronic system can be reduced. Become.

[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, when the ACC power supply of the vehicle is turned off, the + B power supply control unit 10 provided as the vehicle-side device detects the ACC power supply, supplies the + B power supply for a certain period of time, and thereafter performs a process of shutting off. The power supply unit 12 of the audio head unit 11 supplies a predetermined voltage to the deck mechanism unit 13 and the microcomputer unit 14 which are power mechanisms of the car audio device, based on the + B power supply from the + B power supply control unit 10. Also, the + B from the + B power control unit 10
The B power source includes a power unit 15 including a power IC that supplies power to an audio amplifier circuit of the car audio device;
The power is also supplied to the power detection unit 16 that detects on / off of the ACC power. The microcomputer unit 14 receives a signal from the power detection unit 16
When the CC power off signal is input, the + B power control unit 1
During a certain period of time set by 0, the working data and setting data stored in the internal RAM are backed up by EE for backup.
In addition to writing to the PROM 17, post-processing of the deck mechanism unit 13 is executed when necessary. Instead of the EEPROM 17, other non-volatile memories can be used,
Further, a volatile memory of a type in which data is stored and held by a dedicated battery can be used. The battery (+ B) connection device 18 is connected to the subsequent stage of the + B power control unit 10,
One or more units 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 FIG. 2, the + B power supply of the vehicle is:
As in the conventional example, a state from when the battery is connected to when the battery is removed is shown. Even if the + B power supply of the vehicle is turned on and supplied to the + B power supply control section 10, the + B power supply control section 10
Do not supply power. When the + B power supply control unit 10 detects that the ACC power supply of the vehicle has been turned off, the + B power supply control unit 10
Is + B to the power supply section 12 of the audio head unit 11.
The power supply unit 12 supplies a power supply voltage necessary for the deck mechanism unit 13 and the microcomputer unit 14 while supplying power.
The power detector 16 and the power unit 15 are turned on (step S1). On the other hand, the ACC power-on of the vehicle is detected by the power detection
The microcomputer unit 14 causes the power unit 1
5 is subjected to standby control (step S2). Here, when the audio device has been used for a predetermined time (step S
3) During that 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. Thereafter, when the ACC power supply is turned off, the + B power supply control unit 10 detects this and detects the power supply for a predetermined time (for example, 1
Minutes) + B power is output (step S
4) Since the power detector 16 detects that the ACC power is off and outputs a signal to the microcomputer 14,
Writes the work data and setting data held in the internal memory into the EEPROM 17 within the fixed time, performs post-processing for returning the deck mechanism 13 to the initial state, and ends the processing (step S5). . 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 ACC power is turned on, the post-processing is unnecessary.

Next, when the ACC power supply is turned on again,
The B power control unit 10 detects this and supplies + B power to each unit of the audio head unit 11, and the power detection unit 16 detects that the ACC power is turned on.

As described above, according to the present embodiment, the + B power supply control unit 10 provided as the vehicle-side device outputs the + B power supply with a delay for a predetermined time when detecting that the ACC power supply of the vehicle has been turned off. The power detector 16 outputs an ACC power-off signal to the microcomputer 14, and the microcomputer 14
The data held in the internal memory within the fixed time
Since the information is stored in the PROM 17 and the necessary post-processing of the deck mechanism unit 13 is completed, the dark current of the battery can be reduced to zero when the car audio device is not used, thereby preventing wasteful consumption of battery power. it can.

Although the above embodiment is an example in which the present invention is applied to a car audio device, the present invention uses a + B power supply and an ACC power supply and requires post-processing when the ACC power supply is turned off. It can also be applied to other vehicle electronic devices. In addition, since a plurality of electronic devices connected to the subsequent stage of the + B power supply control unit 10 can all control them in the same manner, the battery power reduction effect of the entire vehicle electronic system becomes large.

[0014]

As described above, according to the present invention, when the ACC power supply of the + B power supply and the ACC power supply supplied to the vehicle electronic device is turned off, the + B power supply is applied to the electronic device for a predetermined time. Output, and on the electronic device side, based on the off signal of the ACC power supply, to perform necessary post-processing in the electronic device within the fixed time, and after performing necessary post-processing, Is +
Since the B power supply is cut off, 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 + B 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 Battery (+ B) connection device

Claims (3)

[Claims] When the ACC power supply of the + B power supply and the ACC power supply of the vehicle supplied to the vehicle electronic device is turned off, the vehicle outputs the + B power supply to the electronic device for a predetermined time, and A method for reducing dark current for a vehicle, wherein 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. 2. A + B power supply control unit, which is provided on the vehicle side and supplies a + B power supply of the vehicle for a predetermined time when the ACC power supply of the vehicle is turned off, and is provided on 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 the + B power supply from the + B power control unit, and detecting ON / OFF of the ACC power supply and the + B power supply. A power detection unit that outputs to the microcomputer unit, wherein the microcomputer unit writes data held in the internal memory to another memory by the ACC power-off signal from the power detection unit, A dark current reducing device for a vehicle, wherein the power mechanism unit performs necessary post-processing. 3. The vehicle dark current reduction device according to claim 2, wherein a plurality of electronic devices are connected to a stage subsequent to the + B power supply control unit.