JP2003320910A - Power source control device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a battery exhaustion during parking due to leaving an operation switch turned on, without using an alarm or causing inconvenience to occur due to the power supply being cut off. <P>SOLUTION: An engine ECU 13 determines whether the engine is in a stopped state or not according to output signals from such as a crank angle sensor 17 for detecting the rotational speed of the engine, and a body ECU 14 determines whether the vehicle is in use or not according to output signals such as a door lock sensor 32 for detecting the locking of the door. If it is determined that the engine is in a stopped state by the engine ECU 13 and determined that the vehicle is not in use, the device determines the vehicle to be in a normal parking state and turns off the contact of a power cut-off circuit 12, cutting off the power supply to a head lamp 19, a small lamp 20, a tail lamp 21, a number plate lamp 22, a turn signal lamp 23, a room lamp 24, windshield and rear window wipers 25 and 26. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle power supply control device having a function of automatically cutting off power supply to predetermined electric parts.

[0002]

2. Description of the Related Art Conventionally, in automobiles, for example,
As disclosed in Japanese Unexamined Patent Publication No. 6-255422, a driver turns off an ignition switch while turning on an operation switch for a lamp such as a small lamp (car width light) and keeping the lamp lit. In some cases, a warning sound is emitted to inform the driver that the lamps are in a lighting state, to prevent forgetting to turn off the lamps, and to prevent the battery from running out during parking.

Further, as disclosed in Japanese Unexamined Patent Publication No. 2000-41342, in a power control device for a construction machine, a state in which a main switch for turning on / off power supply to an engine starting device or the like is not operated is long. At the next time, there is a device in which the circuit shutoff switch is automatically turned off to automatically shut off the power supply to all electric components, thereby preventing the battery from running down.

[0004]

However, in the former technique (Japanese Patent Laid-Open No. 6-255422), an alarm sound is emitted to notify that the lamps have been forgotten to be turned off. May cause discomfort to people and others. Particularly in a high-class passenger car, the alarm sound easily impairs a sense of luxury and causes a great deal of discomfort to humans.

Therefore, the latter (Japanese Patent Laid-Open No. 2000-41342)
It is conceivable to apply the technology of construction machinery in Japanese Patent Publication) to automobiles and automatically cut off the power supply to all electric parts when the ignition switch remains off for a predetermined period of time. For example, if you want to keep the headlights and taillights lit to secure the lights for safety and inspection / repair work while the vehicle is stopped due to engine failure at night or during inspection / repair work, turn off the ignition switch. After a lapse of time, power supply to all electric components is automatically cut off, and the headlight and taillight are turned off. In addition, in a system that stores learning data and abnormality diagnosis data in a backup memory that is backed up by battery power, if the power supply to all electrical components is cut off after a predetermined time has elapsed since the ignition switch was turned off, the stored data in the backup memory There is also a problem that is deleted.

The present invention has been made in consideration of these circumstances, and an object thereof is to forget to turn off the operation switch without using an alarm sound and without causing a trouble due to interruption of power supply. It is an object of the present invention to provide a power supply control device for a vehicle that can prevent the battery from running out during parking.

[0007]

In order to achieve the above object, the vehicle power source control device according to claim 1 of the present invention determines whether or not a power source (for example, an engine or a motor) of the vehicle is in a stopped state. Along with the power source stop determination means, the vehicle non-use determination means to determine whether the vehicle is in an unused state,
As a result, it is determined that the power source is in the stopped state, and
When it is determined that the vehicle is not in use, it is determined that the vehicle is in a normal parking state (not during inspection and repair, etc.), and power is automatically supplied to the predetermined electrical parts by the power cutoff means. It is designed to be cut off.

Thus, without using the alarm sound, it is possible to prevent the battery from going up during parking due to forgetting to turn off the operation switch of a predetermined electric component. in this case,
Even when the power source of the vehicle is in the stopped state (the vehicle is in the stopped state), when it is determined that the vehicle is in use, the power supply to the predetermined electric components can be continued,
Predetermined electrical parts (such as headlamps) during inspection and repair work
It is possible to avoid the problem that the power supply to the electric component is cut off despite the fact that the operator wants to keep operating. Moreover, when the power supply is cut off, not only all the electric parts but only the predetermined electric parts are cut off. The power supply of can be continued.

In recent electronically controlled vehicles, in addition to a power source control device for controlling a power source such as an engine and a motor, various control devices for controlling various vehicle-mounted mechanisms such as a door lock mechanism (for example, a body). ECU) is mounted. Generally, an information signal that is effective for determining the stop state of a power source such as an engine (for example, an engine speed signal)
Is input to the power source control device, but an information signal (for example, a door lock signal) effective for determining the unused state of the vehicle is input to the control device (for example, the body ECU) on the vehicle side.

In consideration of such circumstances, the power source control device for controlling the power source functions as the power source stop determination means and the vehicle side for controlling the vehicle mounting mechanism other than the power source. The control device may be configured to function as vehicle non-use determination means. That is, a power source control device to which an information signal (for example, an engine speed signal) effective for determining the stopped state of the power source is input determines whether the power source is in the stopped state, and A control device on the vehicle side to which an information signal (for example, a door lock signal) effective for determining the usage state is input determines whether or not the vehicle is in the unused state. With this configuration, existing signal wirings can be used as much as possible, the number of newly added signal wirings can be reduced, and the wiring structure can be simplified.

A method of determining whether or not the power source is in a stopped state is, for example, as in claim 3, in a state where the start switch is turned off and at least one of the rotation speed and the vehicle speed of the power source is 0. It is preferable to determine that the power source is in the stopped state when the above state continues for a predetermined stop determination time or longer. With this configuration, it is possible to determine that the power source is in the stopped state when the power source is surely in the stopped state.

[0012] Normally, when the driver is not using the vehicle, the engine hood and the trunk cover are closed to close all the windshields and all the doors are closed and locked, so that the vehicle is not in use. The determination method of whether or not is, for example, as claimed in claim 4, a state in which all doors are closed or locked, a state in which all window glasses are closed, a state in which a trunk cover is closed, and an engine. It is preferable to determine that the vehicle is in the non-use state when at least one of the closed bonnets continues for a predetermined non-use determination time or longer.
With this, it is possible to accurately determine that the vehicle is not in use.

According to a fifth aspect of the present invention, the predetermined electric component for cutting off the power supply is a head lamp, a tail lamp,
At least one of a small lamp, a turn signal lamp, a license plate lamp, a room lamp and a wiper (front wind wiper, rear wind wiper) is preferable. Since these electric components are generally electric components that the driver turns on / off the operating switch to activate / stop, the driver may forget to turn off the operating switch. Therefore, by shutting off the power supply to these electric components, it is possible to reliably prevent the battery from dropping due to forgetting to turn off the operation switch.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. First, the schematic configuration of the entire power supply control system will be described with reference to FIG. A power supply terminal of the engine ECU 13 and a power supply terminal of the body ECU 14 are connected to the positive terminal of the on-vehicle battery 11 via a power cutoff circuit 12 including a relay and the like by power supply wiring. The engine ECU 13 is a power source control device that controls an engine (not shown) that is a power source of the vehicle, and includes a body EC
U14 is a vehicle-side control device that controls a vehicle-mounted mechanism such as a door lock mechanism and a power window mechanism (neither is shown).

The positive terminal of the battery 11 has
Ignition switch (hereinafter referred to as “I
A G switch 15) is connected, and an ON / OFF signal of the IG switch 15 is input to the engine ECU 13. When the IG switch 15 is operated to the ON position,
The contact of the power cutoff circuit 12 is turned on, and the power supply voltage from the battery 11 is passed through the power cutoff circuit 12 to the engine EC.
It is supplied to the U13 and the body ECU 14. And IG
Even after the switch 15 is operated to the off position, the power supply voltage from the battery 11 is continuously supplied to the engine ECU 13 and the body ECU 14 until the contact of the power cutoff circuit 12 is turned off.

The engine ECU 13 is provided with a backup RAM 16 (rewritable nonvolatile memory) backed up by the battery 11, and the backup RAM 16 stores learning data relating to engine control, abnormality diagnosis data, and the like. The cylinder block of the engine is provided with a crank angle sensor 17 for detecting the engine rotation speed, and the wheel drive system is provided with a vehicle speed sensor 18 for detecting the vehicle speed. Output signals of the crank angle sensor 17 and the vehicle speed sensor 18 are input to the engine ECU 13.

On the other hand, the power supply circuit (not shown) of the body ECU 14 includes a head lamp 19, a small lamp 20, a tail lamp 21, and a license plate lamp 2.
2, turn signal lamp 23, room lamp 24, front wind wiper 25, rear wind wiper 2
6 etc. are connected. As described above, even after the IG switch 15 is operated to the off position, the power supply voltage from the battery 11 is continuously supplied to the body ECU 14 until the contact of the power cutoff circuit 12 is turned off.
It is possible to supply the power supply voltage to the lamps 19 to 24 and the wipers 25 and 26 through the power supply circuit of U14.

The head lamp 19, the small lamp 20,
When the lamp switch 27 for turning on / off the power supply to the tail lamp 21 and the license plate lamp 22 is operated to the small lamp on position, the small lamp 20, the tail lamp 21, and the license plate lamp 22 are turned on, and further the lamp switch 27 is turned on. When operated to the headlamp on position, the headlamp 19 and the tail lamp 21,
The license plate lamp 22 lights up. On the other hand, when the lamp switch 27 is operated to the off position, the lamps 19-2
All 2 goes out.

When the turn signal switch 28 for turning on / off the power supply to the turn signal lamp 23 is operated to the right ON position, the right turn signal lamp 23 blinks and the turn signal switch 28 is operated to the left ON position. Then, the left turn signal lamp 23 blinks. On the other hand, when the turn signal switch 28 is operated to the off position (or when the turn signal switch 28 returns to the off position due to the rotation of the steering wheel), the turn signal lamps 23 on both the left and right sides are turned off.

When the room lamp switch 29 for turning on / off the power supply to the room lamp 24 is operated to the on position, the room lamp 24 is turned on, and when the room lamp switch 29 is operated to the off position, the room lamp 24 is turned off. .

When the front wiper switch 30 for turning on / off the power supply to the front windshield wiper 25 is operated to the on position, the front windshield wiper 25 wipes and when the front windshield wiper switch 30 is operated to the off position, the front windshield wiper 25 is operated. 25 stops. Further, when the rear wind wiper switch 31 for turning on / off the power supply to the rear wind wiper 26 is operated to the on position, the rear wind wiper 26 wipes, and when the rear wiper switch 31 is operated to the off position, the rear wind wiper 26 is operated. Stops.

These various electric parts (lamps 19 to 2)
4, the wiper 25, 26), the driver switches 27 ~
Since it is an electric component that operates / stops 29, 30, 31 by turning on / off, switches 27 to 29,
You may forget to cut off 30 and 31.

Further, a door lock mechanism (not shown) of each door of the vehicle is provided with a door lock sensor 32 for detecting that the door is locked, and a power window mechanism (not shown) of each door is provided. Is provided with a window sensor 33 that detects that the window glass is closed. Furthermore, near the engine bonnet (not shown) of the vehicle,
An engine bonnet sensor 34 that detects that the engine bonnet is closed is provided, and a trunk cover sensor 35 that detects that the trunk cover is closed is provided near the trunk cover (not shown). The output signals of these sensors 32-35 are input to the body ECU 14.

Engine ECU 13 and body ECU 14
Are each mainly composed of a microcomputer. The engine ECU 13 is a ROM (storage medium)
By executing the engine stop determination program shown in FIG. 2 stored in FIG. 2, it is determined whether or not a predetermined engine stop determination condition is satisfied, and when the engine stop determination condition is satisfied, the engine is in the stopped state. To determine. on the other hand,
The body ECU 14 determines whether or not a predetermined vehicle non-use determination condition is satisfied by executing the vehicle non-use determination program stored in the ROM shown in FIG. 3, and the vehicle non-use determination condition is satisfied. At times, it is determined that the vehicle is not in use.

Further, the engine ECU 13 executes the power supply cutoff control program shown in FIG. 4 stored in the ROM to determine that the engine is in the stopped state, and
When it is determined that the vehicle is not in use, it is determined that the vehicle is in a normal parking state (a state not during inspection and repair, etc.), and the contact point of the power shutoff circuit 12 is turned off. Small lamp 20, tail lamp 21,
License plate lamp 22, turn signal lamp 2
3, room lamp 24, front wind wiper 2
5. The power supply to the rear wind wiper 26 is automatically cut off. As a result, the switch 2 of the lamps 19 to 24
Forgot to cut 7-29 and switch 3 for wipers 25, 26
It is possible to prevent the battery 11 from going up during parking due to forgetting to turn off 0, 31.

Hereinafter, the engine ECU 13 and the body ECU
The processing contents of each program of FIGS. 2 to 4 executed by the program 14 will be described.

The engine stop determination program shown in FIG.
Is executed in a predetermined cycle after turning off, and serves as a power source stop determination unit in the claims. When this program is executed, first, at step 101, the engine speed detected by the crank angle sensor 17 and the vehicle speed detected by the vehicle speed sensor 18 are read.

After that, the routine proceeds to step 102, where it is judged whether or not a predetermined engine stop judgment condition is satisfied.
Here, the engine stop determination condition is, for example,
That is, the condition of satisfying at least one of the above conditions and at least one of the above conditions continues for a predetermined stop determination time TA or more.

The state in which the IG switch 15 is turned off continues for a predetermined time T1 or more. The state in which the engine speed becomes 0 continues for a predetermined time T2 or more (the predetermined time T2 is set to 0). Then, the condition of may be that the engine speed is 0.) The state in which the vehicle speed is 0 continues for a predetermined time T3 or more (note that the predetermined time T3 is set to 0). The condition may be that the vehicle speed is 0.) If the condition that the above condition is satisfied and at least one of the conditions is satisfied continues for a predetermined stop determination time TA or more, the engine The stop determination condition is satisfied, but if not, the engine stop determination condition is not satisfied.

The engine stop determination condition may be changed as appropriate, for example, when the IG switch 15 is turned off or when the IG switch 15 remains off for a predetermined time or longer, the engine stop determination condition is determined. May be established. Alternatively, the engine stop determination condition may be satisfied when the engine speed becomes 0 or when the engine speed becomes 0 for a predetermined time or longer.

If it is determined that the engine stop determination condition is satisfied, the routine proceeds to step 103, where it is determined that the engine is in the stopped state, and this program ends. on the other hand,
When it is determined that the engine stop determination condition is not satisfied,
The program ends without determining that the engine is stopped.

The vehicle nonuse determination program shown in FIG.
It is executed by the body ECU 14 in a predetermined cycle after the IG switch 15 is turned off, for example, and serves as vehicle non-use determining means in the claims. When this program is executed, first, in step 201, the output signals of the door lock sensor 32, the window sensor 33, the engine hood sensor 34, and the trunk cover sensor 35 are read.

After that, the routine proceeds to step 202, where it is judged whether or not a predetermined vehicle non-use judgment condition is satisfied. Here, the vehicle non-use determination condition is, for example, that a state in which all of the following conditions 1 to 4 are satisfied continues for a predetermined non-use determination time TB or more.

All the doors are locked for a predetermined time T4 or longer and all the windows are closed for a predetermined time T.
Continue for 5 or more The state that the engine bonnet is closed is the predetermined time T6.
If the state where all of the above-mentioned conditions are satisfied continues for a predetermined non-use determination time TB or more, the vehicle non-use determination condition is satisfied. Is satisfied, but otherwise, the vehicle nonuse determination condition is not satisfied.

The vehicle non-use determination condition may be changed as appropriate. For example, the vehicle non-use determination condition is satisfied when a state in which three of the above conditions 1 to 3 are satisfied continues for a predetermined time or more. It may be done. Or above ~
The vehicle non-use determination condition may be satisfied when the state in which one or two of the conditions is satisfied continues for a predetermined time or more.

If it is determined that the vehicle non-use determination condition is satisfied, the routine proceeds to step 203, where it is determined that the vehicle is not in use, and this program is terminated. On the other hand, when it is determined that the vehicle non-use determination condition is not satisfied, the present program is terminated without determining the vehicle non-use state. The determination result of whether or not the vehicle is not in use is transmitted to the engine ECU 13.

The power cutoff control program shown in FIG. 4 is executed by the engine ECU 13 in a predetermined cycle after the IG switch 15 is turned off, for example, and functions as power cutoff means in the claims. When this program is executed, first, in step 301, it is determined whether or not the engine is in a stopped state, and then in step 302
Then, it is determined whether or not it is determined that the vehicle is not in use.

In both steps 301 and 302, "Yes
If it is determined to be “s”, that is, if it is determined that the engine is stopped and that the vehicle is not in use, then the vehicle is in a normal parking state (a state other than during inspection and repair). Then, the process proceeds to step 304, the contact of the power cutoff circuit 12 is turned off, and the head lamp 19, the small lamp 20, the tail lamp 21, the license plate lamp 22, the turn signal lamp 23, the room lamp 24, the front wind wiper 25. The power supply to the rear wind wiper 26 is cut off.

At this time, the power supply to the backup RAM 16 is not cut off. Also, turn signal lamp 23
For, the power supply via the turn signal switch 28 is cut off, but a hazard switch (not shown)
The power supply via is not interrupted. Therefore, the turn signal lamp 23 can be used only as a hazard lamp.

On the other hand, the above steps 301 and 30
When it is determined to be “No” in any one of 2 (for example, when it is determined that the vehicle is in use even when the engine is stopped), the process proceeds to step 304,
The contacts of the power cutoff circuit 12 are kept on, and the power supply to the lamps 19 to 24 and the wipers 25 and 26 is continued.

In the embodiment described above, it is determined that the engine is in the stopped state (the vehicle is in the stopped state), and
When it is determined that the vehicle is not in use, it is determined that the vehicle is in a normal parking state (not during inspection and repair, etc.), and the headlamp 19, the small lamp 20, the tail lamp 21, the license plate lamp 22, Since the power supply to the turn signal lamp 23, the room lamp 24, the front wind wiper 25, and the rear wind wiper 26 is automatically cut off, without using an alarm sound,
It is possible to prevent the battery 11 from going up during parking due to forgetting to turn off the switches 27 to 29 of the lamps 19 to 24 and forgetting to turn off the switches 30 and 31 of the wipers 25 and 26.

In this case, even if the engine is stopped (the vehicle is stopped), when it is determined that the vehicle is in use, the lamps 19 to 24 and the wipers 25 and 26 are used.
Since the power supply to the lamps 19 to 24 and the wipers 25 and 26 is cut off, it is possible to continue to supply the power to the headlamps 19 and the like during inspection and repair work. It is possible to avoid a problem such as a failure. Moreover, when the power supply is cut off, only the power supply to the predetermined electric parts (the lamps 19 to 24 and the wipers 25 and 26 in this embodiment) is cut off instead of all the electric parts. It is possible to continue the power supply to the electric components such as the backup RAM 16 that need to be supplied.

Further, in the present embodiment, the engine ECU 13 to which an information signal (for example, an engine speed signal) effective for determining the stop state of the engine is input determines whether or not the engine is in the stop state. Since the body ECU 14 to which an information signal (for example, a door lock signal) effective for determining the unused state of the vehicle is input, it is determined whether or not the vehicle is in the unused state. By using the wirings as much as possible, it is possible to reduce the number of newly added signal wirings and simplify the wiring structure.

However, the control device for determining the unused state of the vehicle is the body EC for controlling the door lock mechanism and the like.
Not limited to U14, other vehicle-side control device, for example,
The non-use state of the vehicle may be determined by an instrument panel ECU that controls a meter or the like of an instrument panel or an AT control ECU that controls an AT (automatic transmission).

Further, both the determination of the stopped state of the engine and the determination of the unused state of the vehicle may be performed by the control device (for example, body ECU, instrument panel ECU) on the vehicle side. Alternatively, the engine ECU may determine both the stop state of the engine and the non-use state of the vehicle.

In the above embodiment, when the engine is stopped and the vehicle is not in use, the head lamp 19, the small lamp 20, the tail lamp 21, the license plate lamp 22 and the turn signal lamp 2 are provided.
3, room lamp 24, front wind wiper 2
5. Although the power supply to the rear wind wiper 26 is all cut off, the electric parts for cutting off the power supply at this time may be changed appropriately.

For example, when the IG switch 15 is off, the turn signal lamp 23 and the front wind wiper 2
5. Shut off the power supply to the rear wind wiper 26,
The power supply to the headlamp 19, the small lamp 20, the tail lamp 21, the license plate lamp 22, and the room lamp 24 may be cut off when the engine is stopped and the vehicle is not in use.

Also, when the engine is stopped and the vehicle is not in use, the power supply to one or more electric parts of the lamps 19 to 24 and the wipers 25 and 26 is cut off. Is also good.

Further, when the engine is stopped and the vehicle is not in use, the power supply to the electric parts other than the lamps 19 to 24 and the wipers 25 and 26 (for example, fog lights) may be cut off. good.

Further, the present invention is not limited to a vehicle having an engine as a power source, but is also applied to an electric vehicle having a motor as a power source, a hybrid vehicle having both an engine and a motor as a power source, and the like. can do.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an entire power supply control system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of processing of an engine stop determination program.

FIG. 3 is a flowchart showing a processing flow of a vehicle non-use determination program.

FIG. 4 is a flowchart showing a processing flow of a power shutdown control program.

[Explanation of symbols]

11 ... Battery, 12 ... Power cutoff circuit, 13 ... Engine ECU (power source stop determination means, power cutoff control means, power source control device), 14 ... Body ECU (vehicle nonuse determination means), 15 ... IG switch (starting) Switch), 17 ... crank angle sensor, 18 ... vehicle speed sensor, 19 ... headlight, 20 ... small lamp, 21 ... taillight, 22
... License plate lamp, 23 ... Turn signal lamp, 24 ... Room lamp, 25 ... Front wind wiper, 26 ... Rear wind wiper, 32 ... Door lock sensor, 33 ... Wind sensor, 34 ... Engine bonnet sensor, 35 ... Trunk cover sensor .

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B60Q 11/00 B60Q 11/00 645E 645 645F 645G 1/04 B

Claims (5)

[Claims] 1. A power source stop determination means for determining whether or not a power source of a vehicle is in a stopped state, a vehicle non-use determination means for determining whether or not the vehicle is in an unused state, and the power When the power stop determination means determines that the power source is in a stopped state, and the vehicle non-use determination means determines that the vehicle is in an unused state, power is supplied to predetermined electric components. A power supply control device for a vehicle, comprising: a power supply cutoff means for cutting off. 2. A power source control device that controls the power source functions as the power source stop determination means, and a vehicle-side control device that controls a vehicle-mounted mechanism other than the power source serves as the vehicle non-use determination means. The vehicle power supply control device according to claim 1, wherein the power supply control device is configured to function. 3. The power source stop determination means, when the start switch is off and at least one of the rotation speed and the vehicle speed of the power source becomes 0 for a predetermined stop determination time or longer. The power supply control device for a vehicle according to claim 1, wherein the power source is determined to be in a stopped state. 4. The vehicle non-use determining means includes a state in which all doors are closed or locked, a state in which all window glasses are closed, a state in which a trunk cover is closed, and an engine bonnet is closed. The vehicle according to any one of claims 1 to 3, wherein the vehicle is determined to be in an unused state when at least one of the states has continued for a predetermined non-use determination time or longer. Power controller. 5. The predetermined electric component for cutting off the power supply by the power cutoff means is a head lamp, a tail lamp,
The vehicle power supply control device according to any one of claims 1 to 4, wherein the power supply control device is at least one of a small lamp, a turn signal lamp, a license plate lamp, a room lamp, and a wiper.