JP2002059791A - On-vehicle electronic equipment controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the burden of a battery during the startup of an engine. SOLUTION: This on-vehicle electronic equipment controller supplies electric power from the battery 11 to on-vehicle electronic equipment 17 via an accessory-(Acc) terminal when a vehicle key switch 12 is in an ignition position. An Acc on/off detection circuit 22 detects the turning on of an accessory line 14. A CPU 23 suspends the supply of electric power to the electronic equipment 17 for a predetermined time after the turning on of the accessory line 14 has been detected; after the elapse of the predetermined time, the CPU turns on a group of power switches 21 of the equipment 17 to supply electric power to the equipment 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for electronic equipment mounted on a vehicle.

[0002]

2. Description of the Related Art FIG. 4 shows a schematic configuration diagram of a conventional electronic device control device for a vehicle. Conventional in-vehicle electronic device 117 (CD
/ MD player, a car audio device such as a radio receiver, an air conditioner, etc.) from the battery 111 when the key switch (engine key) 112 is in the accessory (Acc) position or the ignition (IGN) position. Ac to which voltage is supplied
c power supply (accessory line) 114 and key switch 1
It is connected to two power supplies, a backup power supply (backup line) 115 to which a DC voltage is always supplied from the battery 111 irrespective of the position of the twelve.

[0003] While the engine is running, the key switch 112 is in an ignition position, and electric power generated by an alternator (alternating current generator) 118 having a rectifying circuit is supplied to the on-vehicle electronic device 117 and the battery 111.

[0004]

However, when the key switch 112 is in the accessory position, the engine is stopped and the alternator 118 does not generate electric power.
Power is supplied to the on-vehicle electronic device 117 only from the battery 111. Therefore, if the in-vehicle electronic device 117 is operated at the accessory position for a long time, the battery 111 may be consumed and the battery may run out.

When the battery 111 is running low,
The power supplied to the vehicle-mounted electronic device 117 becomes insufficient. Further, in order to start the engine, the key switch 112 is used.
Is set to the ignition position to try to rotate the starter motor, the in-vehicle electronic device 117 consumes power, so that the starter motor may not rotate sufficiently and the engine may not start.

Japanese Patent Application Laid-Open No. 8-23641 discloses an output control circuit for reducing the output of a car audio device in order to suppress battery consumption when the supply of power from an AC generator is stopped. . However, this output control circuit is effective when the key switch is switched from the ignition position to the accessory position, and does not operate when the engine is started.

Japanese Patent Application Laid-Open No. 9-73706 discloses that
2. Description of the Related Art An on-vehicle acoustic device control device that reduces a load on a battery by setting a CPU that controls on-vehicle acoustic devices to a standby mode is disclosed. However, this on-vehicle acoustic device control device detects that the accessory line has been turned off and puts the CPU in the standby mode, and does not reduce the load on the battery when the engine is started.

The present invention has been made in view of such circumstances, and an object of the present invention is to reduce a load on a battery when an engine is started.

Another object of the present invention is to make it possible to start the engine more reliably even when the remaining amount of the battery is low.

[0010]

In order to achieve the above object, an on-vehicle electronic device control apparatus according to the present invention provides a vehicle-mounted electronic device control device which connects a battery to an electronic device via an accessory terminal when a key switch of the vehicle is in an ignition position. A vehicle-mounted electronic device control device that supplies power, a detecting unit that detects that an accessory line connected to the accessory terminal is turned on, and that the detecting unit detects that the accessory line is on, A delay unit that waits for power supply to the electronic device for a predetermined time and supplies power after the predetermined time has elapsed.

With the above configuration, power supply to the on-vehicle electronic device can be stopped for a predetermined time after the accessory line is turned on. Therefore, since power from the battery is not supplied to devices not directly related to the engine start, the load on the battery at the time of engine start can be reduced. Further, since the power from the battery can be intensively supplied to a place requiring a large amount of power, the engine can be started more reliably even when the remaining amount of the battery is low. .

[0012] The delay means includes a timer circuit for measuring a time from when the detection of the accessory line is turned on, and a timer circuit for measuring a time since the detection of the accessory line is detected by the detection means. When the timer circuit measures a predetermined time,
Means for supplying power to the electronic device.

[0013] The delay means may include means for supplying power to the electronic device after a lapse of a predetermined time according to the electronic device.

According to the above configuration, by changing the standby time of the power supply according to each electronic device, it becomes possible to supply the power preferentially to the device having a high need for the power supply.

[0015] Further, the control apparatus for a vehicle-mounted electronic device according to the present invention includes a battery, a generator, a cell motor, a key switch, and an electronic device that operates with power supplied from the battery through an accessory line. By operating the key switch, at least after the accessory line is turned on, the self-motor is driven to start the engine, and the power is supplied from the battery to the electronic device from the battery until the engine is started to supply power from the generator. And control means for stopping supply of power to the power supply.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an embodiment of a vehicle electronic device control apparatus according to the present invention.

The on-vehicle electronic device control device is configured such that when the IGN power supply (ignition line) 13 and the key switch (engine key) 12 are in the accessory (Acc) position or the ignition (IGN) position, the DC (DC) 3) Three power supplies are provided: an Acc power supply (accessory line) 14 to which a voltage is supplied, and a backup power supply (backup line) 15 to which a DC voltage is always supplied from the battery 11 regardless of the position of the key switch.

When the key switch 12 is in the ignition position, a DC voltage is supplied from the battery 11 to the ignition line 13, and the accessory line 1
4, a DC voltage is supplied from the battery 11 when the key switch 12 is in the accessory position or the ignition position.
The DC voltage is always supplied from the battery 11 regardless of the position of the key switch.

The ignition line 13 is connected to an ignition circuit 16 including a starter motor, a discharge plug, and the like.

The accessory line 14 is connected via a power switch group 21 to car audio equipment such as a CD / MD player and a radio receiver, and various in-vehicle electronic equipment such as an air conditioner. Further, an Acc on / off detection circuit 22 is connected to the accessory line 14, and the Acc on / off detection circuit 22 and the power switch group 21 are connected to a CP for controlling the operation of each section of various electronic devices.
U23 is connected.

The backup line 15 is connected to an electronic device such as a timepiece that requires power at all times.

In FIG. 1, electronic devices that operate on electric power from the battery 11 are collectively represented as on-vehicle electronic devices 17.

The CPU 23 is supplied with power from the backup line 15 and constantly monitors the entire system. The CPU 23 has a timer function and repeatedly executes the processing shown in the flowchart of FIG.

Next, the operation of the on-vehicle electronic device control device shown in FIG. 1 will be described with reference to FIG.

First, the CPU 23 determines from the output signal of the Acc on / off detection circuit 22 whether the accessory line 14 has changed from the on state or the off state (step S1). That is, it is determined whether or not the voltage applied to the accessory line 14 has changed. If it has not changed, it waits until it changes, and if it detects a change, it proceeds to step S2.

In step S2, it is determined whether the change that has occurred is a change of the accessory line 14 from OFF to ON or a change from ON to OFF. That is,
It is determined whether the state is a change from a state where no voltage is applied to the accessory line 14 from the battery 11 to a state where the voltage is applied, or a state where the voltage is applied from the state where the voltage is not applied. .

When the accessory line 14 changes from on to off, that is, when the supply of power to the accessory line 14 is stopped, the CPU 23 turns off the power switch group 21 of the various in-vehicle electronic devices 17 (step S1). S
3). Note that for electronic devices to which power is supplied from the backup line 15, the backup line 15
Continues operation with power from

On the other hand, when the accessory line 14 changes from off to on, that is, when a voltage is applied to the accessory line 14, the CPU 23 waits for a wait time T (for example, 2 seconds) set in advance in the program. The power switch group 21 is kept off until the battery 1
The supply of the voltage from No. 1 is stopped (step S4).

During the wait time T, the battery 11
Is supplied intensively to a location requiring large power such as a starter motor, so that even if the battery 11 is slightly rising, the starter motor starts and the engine starts reliably.

When the engine starts, a generator (alternator) 18 having a rectifier circuit generates electric power, and electric power is supplied to the battery 11, the ignition line 13, and the accessory line 14.

When the CPU 23 detects that the wait time T has passed since the accessory line 14 was turned on, the power switch group 21 of the various on-vehicle electronic devices 17 is turned on, and the various on-vehicle devices from the battery 11 or the generator 18 are turned on. Of power supply to the electronic device 17 is started (step S
5).

As described above, by providing the timer function in the CPU 23, the timing of turning on the power switch group 21 of the vehicle-mounted electronic device 17 after the accessory line 14 is turned on can be delayed. Therefore, the power from the battery 11 can be intensively supplied to a place requiring a large amount of power when the engine is started.

In this embodiment, the wait time T is set to C
The time is set to two seconds after the PU 23 detects the output signal from the Acc on / off detection circuit 22. However, it is not necessary to provide the same wait time for all the on-vehicle electronic devices 17, and the circuits and devices that require power are ranked. And wait times may be provided in that order. For example, the power may be supplied to the starter motor after detecting the output signal from the Acc on / off detection circuit 22, and the power may be supplied to the meter two seconds after that and to the audio one second after that. As described above, by changing the wait time depending on the in-vehicle electronic device, it is possible to preferentially supply power to a device that needs high power supply.

In the present embodiment, the wait time is provided in the program, but as shown in FIG.
A timer circuit 24 may be provided between the power supply switch 3 and the power switch group 21 of the vehicle-mounted electronic device 17. In this case, after the accessory line 14 is turned on, the CPU 23
May control the timer circuit 24 so that the power switch group 21 of the vehicle-mounted electronic device 17 is turned on after a predetermined period.

In the present embodiment, the wait time is set in advance in the program of the CPU 23, and after a predetermined time has elapsed, the power switch group 21 of the on-vehicle electronic device 17 is turned on. The power switch group 21 may be turned on after a sensor or the like confirms that power has been generated from the power supply.

Normally, when the engine is started, a series of operations is performed in which the key switch 12 is connected from the accessory position to the ignition position and then the starter motor is rotated. By stopping the supply of power to the on-vehicle electronic device 17 at the time when ON is detected,
The power from the battery 11 can be reliably supplied intensively to a place where large power is required at the time of starting the engine.

In the present embodiment, the accessory line 14
Power supply to the in-vehicle electronic device 17 was stopped after detecting that the power switch was turned on, but after the key switch 12 was connected to the ignition line 13, the power switch group 21 of the in-vehicle electronic device 17 was turned off. The electric power from the battery 11 may be intensively supplied to a place requiring large electric power at the time of starting the engine, and the power switch group 21 of the vehicle-mounted electronic device 17 may be turned on after the engine is started.

[0038]

As described above, by using the on-vehicle electronic device control device of the present invention, the load on the battery at the time of starting the engine can be reduced. Further, even when the remaining amount of the battery is low, the engine can be started more reliably.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a vehicle-mounted electronic device control device according to the present invention.

FIG. 2 is a flowchart showing an operation of the on-vehicle electronic device control device shown in FIG.

FIG. 3 is a block diagram of a modified example of the in-vehicle electronic device control device according to the present invention.

FIG. 4 is a schematic view of a conventional on-vehicle electronic device control device.

[Explanation of symbols]

11, 111 Battery 12, 112 Key switch 13, 113 IGN power supply (ignition line) 14, 114 Acc power supply (accessory line) 15, 115 Backup power supply (backup line) 16, 116 Ignition system circuit 17, 117 In-vehicle electronic device 18 , 118 Generator (Alternator) 21 Power Switch Group 22 Acc On / Off Detection Circuit 23 CPU 24 Timer Circuit

Claims (4)

[Claims] 1. An on-vehicle electronic device control device for supplying electric power from a battery to an electronic device via an accessory terminal when a key switch of the vehicle is in an ignition position, wherein the accessory is connected to the accessory terminal. Detecting means for detecting that the line has been turned on, and waiting for power supply to the electronic device for a predetermined time after the detection of the turning on of the accessory line, and supplying power after a predetermined time has elapsed. And an electronic device control device for a vehicle. A delay circuit configured to measure a time from when the accessory line is turned on by the detection unit; and a timer circuit that measures the time when the accessory line is turned on by the detection unit. And a means for supplying power to the electronic device when the timer circuit measures a predetermined time while waiting for power supply to the device.
3. The on-vehicle electronic device control device according to claim 1. 3. The on-vehicle electronic device control device according to claim 1, wherein the delay unit includes a unit that supplies power to the electronic device after a predetermined period of time has elapsed according to the electronic device. . 4. A battery, a generator, a cell motor, a key switch, an electronic device operated by electric power supplied from the battery via an accessory line, and the accessory line is operated by operating the key switch. Control means for turning on the cell motor, starting the engine by driving the cell motor, and stopping supply of power from the battery to the electronic device until power is supplied from the generator by starting the engine. An in-vehicle electronic device control device, comprising: